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Chemistry Questions and Answers August 14, 2020

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What is the maximum amount of nitrogen dioxide that can be produced by mixing 4.2 gm of NO(g) and 3.2 gm of O(g) (a) 4.60 g (d) 6.44 g (b) 2.30 g (c) 3.22 g

How many gm pure KMnO4 should be heated with HSO4 to produce 48 gm O KMnO4 HSO4 KSO4 MnSO4 HO O (b) 122.5 g (c) 158 g (d) 316 g (a) 189.6 g

Mass of sucrose C2H2O11 produced by mixing 84 gm of carbon, 12 gm of hydrogen and 56 lit. O at 1 atm 273 K according to given reaction, is CHO11(s) C(s) H(g) O (g) (b) 155.5 (a) 138.5 (c) 172.5 (d) 199.5

The mass of CO produced from 620 gm mixture of CHO O, prepared to produce maximum energy is (Combustion reaction is exothermic) (a) 413.33 g (b) 593.04 g (d) 320 g (c) 440 g

The mass of P4010 produced if 440 gm of P4S3 is mixed with 384 gm of O is P4010 SO (a) 568 g PAS30 (b) 426 g (c) 284 g (d) 396 g

The mass of Mg3N produced if 48 gm of Mg metal is reacted with 34 gm NH3 gas is Mg NH3 Mg3N H 100 400 3 3 (a) 200 3 (b) (c) (d) 150 3

A mixture of CH and CH occupied a certain volume at 80 mm Hg. The mixture was completely burnt to CO and HO(1). When the pressure of CO was found to be 230 mm Hg at the same temperature and volume, the fraction of CH in mixture is (a) 0.125 (b) 0.5 (c) 0.85 (d) 0.25

20 mL of a mixture of CO and H were mixed with excess of O and exploded cooled. There was a volume contraction of 23 mL. All volume measurements corresponds to room temperature (27C) and one atmospheric pressure. Determine the volume ratio V V of CO and H in the original mixture (a) 6.5 13.5 (c) 9 11 (d) 713 (b) 515

The by volume of C4H0 in a gaseous mixture of C4H10, CH4 and CO is 40. When 200 ml of the mixture is burnt in excess of O. Find volume (in ml) of CO produced. (a) 220 (b) 340 (c) 440 (d) 560

A definite amount of gaseous hydrocarbon was burnt with just sufficient amount of O. The volume of all reactants was 600 ml, after the explosion the volume of the products CO(g) and HO(g) was found to be 700 ml under the similar conditions. The molecular formula of the compound is (a) CHg (b) C3H6 (d) C4H10 (c) C3H4

Equal volumes of 10 (vv) of HCl is mixed with 10 (vv) NaOH solution. If density of pure NaOH is 1.5 times that of pure HCl then the resultant solution be. (a) basic (b) neutral (c) acidic (d) cant be predicted.

One mole mixture of CH4 air (containing 80 N 20 O by volume) of a composition such that when underwent combustion gave maximum heat (assume combustion of only CH). Then which of the statements are correct, regarding composition of initial mixture.(X presents mole fraction) (a) X CH4 (c) XCH4 1 7, X0 11 2 11 2 3 8 11 3 (b) XcH, ,Xo, (d) Data

Assuming complete precipitation of AgCl, calculate the sum of the molar concentration of all the ions if 2 lit of 2M AgSO4 is mixed with 4 lit of 1 M NaCl solution is (b) 2M (a) 4M (c) 3 M (d) 2.5 M

100 mL of 30 (wv) NaOH solution is mixed with 100 mL 90 (wv) NaOH solution. Find the molarity of final solution. (a) 1.3 (b) 13 (c) 15 (d) 15

If 50 gm oleum sample rated as 118 is mixed with 18 gm water, then the correct option is (a) The resulting solution contains 18 gm of water and 118 gm HSO4 (b) The resulting solution contains 9 gm water and 59 gm HSO4 (c) The resulting solution contains only 118 gm pure HSO4 (d) The resulting solution contains 68 gm of pure HSO4

10 10 Similar to the labelling of oleum, a mixture of HPO4 and P400 is labelled as (100 x) where x is the maximum mass of water which can react with P400 present in 100 gm mixture of HPO4 and P4010. If such a mixture is labelled as 127 . Mass of P4010 in 100 gm of mixture, is (a) 71 gm (d) 35 gm (b) 47 gm (c) 83 gm

The recommended daily dose is 17.6 milligrams of vitamin C (ascorbic acid) having formula CHO. Match the following. Given N 6 x 1023 Column I (A) Oatoms present (B) Moles of vitamin C in 1 gm of vitamin C (C) Moles of vitamin C in 1 gm should be consumed daily (a) (A)R, (B)Q, (C)P (c) (A)P, (B)R, (C)Q Column II (P) (Q) (R) (b) (A)R, (B)P, (C)Q

Match the column Column I 10 M MgO (d solution 1.20 gmml) Solute MgO Solvent HO 40 wv NaOH (d solution 1.6 gmml) Solute NaOH (A) (B) (C) (D) Solvent HO 8 m CaCO3 Solute CaCO3 Solvent HO 0.6 mol fraction of X (molecular mass 20) in Y (molecular mass 25) Solute X Solvent Y (a) (A)Q (B)P (C)S (D)R (c) (A)R (B)P (C)S (D)Q (P) Column II W 120 gm

Match the column Column I 20 by volume aqueous CH5OH solution (P) by volume, having density of 0.96 g cm (A) 5V HO solution. 18 M aq HSO4 solution, having density of 1.84 g cm3 20 aq. HSO4 solution by weight, having density of 1.25 (a) (A)R, (B) S, (C) P, (D)Q (c) (A) Q, (B) R, (C) P, (D)Q (B) (C) (D) g cm 3 (Q) (R) (S) Column II 236.8 M 2.55

Titanium, which is used to make air plane engines and frames, can be obtained from titanium tetrachloride, which in turn is obtained from titanium oxide by the following process 3 TiO(s) 4C (s) 6Cl (g) 3TiCl4(g) 2CO(g) 2CO (g) A vessel contains 4.32 g TiO, 5.76 g C and 6.82 g Cl, suppose the reaction goes to completion as written, how many

One mole of CO contains (a) 6.023 1023 gatom of CO (c) 18.1 x 10 molecule of CO (b) 12.04 x 1023 atom of oxygen (d) 6.023 x 1023 atom of carbon

11.2 litre of a gas at STP weighs 14 g. (a) N (b) CO gases would be (d) BH6 (c) N0 The

Two gases A and B which react according to the equation aAgbB (g) to give two gases C and D are taken (amount not known) in an Eudiometer tube (operating at a constant Pressure and temperature) to cause the above. cC dD (g) If on causing the reaction there is no volume change observed then which of the following statement isare correct. (a) (a

A mixture of C3Hg (g) O having total volume 100 ml in an Eudiometry tube is sparked it is observed that a contraction of 45 ml is observed what can be the composition of reacting mixture. (a) 15 ml CH 85 ml O (c) 45 ml C3Hg 55 ml O (b) 25 ml CH 75 ml O (d) 55 ml C3Hg 45 ml O

For the following reaction N 3H 2NH3 Identify the compositions which will produce same amount of NH3. (a) 140 g N 35 g H (b) 18 g H 52 g N (c) Total 20 moles of mixture having N H present in stoichiometric ratio (No limiting reagent) (d) 136 gm of mixture having mass fraction of H 6 34

An organic compound is burnt with excess of O to produce CO(g) and HO(1), which results in 25 volume contraction. Which of the following option(s) satisfy the given conditions. (a) 10 ml C3Hg 110 ml O (c) 10 ml C3HO 50 ml O (b) 20 ml CHO 80 ml 0 (d) 40 ml CHO4 60 ml O

Solution(s) containing 40 gm NaOH isare (a) 50 gm of 80 (ww) NaOH (b) 50 gm of 80 (wv) NaOH dsoln. 1.2 gmml (c) 50 gm of 20 M NaOH dsoln. 1 gmml (d) 50 gm of 5m NaOH

solution The incorrect statement(s) regarding 2M MgCl, aqueous solution isare (d (a) Molality of Cl is 4.44 m (b) Mole fraction of MgCl is exactly 0.035 (c) The conc. of MgCl, is 19 wv (d) The conc. of MgCl is 19 104 ppm 1.09 gmml)

A sample of HO solution labelled as 56 volume has density of 530 gmL. Mark the correct option(s) representing concentration of same solution in other units. (Solution contains only HO and HO) (a) MH0 6 (c) Mole fraction of HO 0.25 (b) W V 17 1000 (d) mHO 72

100 mL of 0.8 M NaOII are used to neutralize 100 mL solution obtained by passing 2.70 g SOCl in water. Select the correct statement. (a) The solution of SOCl has 0.2 M HSO4 and 0.4 M HCl (b) The volume ratio of NaOH used for HSO4 and HCl is 11 (c) The volume ratio of NaOH used for HSO4 and HCl is 12 (d) Molarity of SOCl solution is 0.1 M

The pair of species having different percentage (mass) of carbon is 12 (a) CHCOOH and C.HO6 (c) HCOOCH, and HCOOH (b) CHCOOH and CHOH (d) CH,OH and CHOCH,

30 mL of CHOH (d 0.8 gcm) is mixed with 60 mL of CHOH (d 0.92 gcm) at 25C to form a solution of density 0.88 gcm. Select the correct option (a) Molarity and molality of resulting solution are 6.33 and 13.59 respectively (b) The mole fraction of solute and molality are 0.385 and 13.59 respectively (c) Molarity and change in volume are 13.59 and

Which of the following isare correct for 17 gL of HO solution (a) Volume strengths is 5.6 and 273 K and 1 atm (b) Molarity of solution is 0.5 M (c) 1 mL of this solution gives 2.8 mL O at 273 K and 2 atm (d) The normality of solution is 2M

Solution containing 23 g HCOOH isare (W) V (a) 46g of 70 HCCOH (d 1.40 gmL) solution,(b) 50g of 10 M HCOOH (dsolution 1 gmL) (H) W (c) 50g of 25 HCOOH (d) 46 g of 5M HCOOH (d solution 1 gmL)

A sample of HO solution labelled as 28 volume has density of 265 gL. Mark the correct option(s) representing concentration of same solution in other units (a) MH0 2.5 (c) Mole fraction of HO 0.2 W (b) 17 V (d) mH0 13.88

Dichromate ion in acidic medium oxidizes stannous ion as xSn yCrO2 zH aSnbCr cHO (a) the value of xy is 13 (c) a bis 32 (b) the value of x y z is 18 (d) the value of zc is 7

How many moles of potassium chlorate to be heated to produce 5.6 litre oxygen at 0C and 1 atm

Zinc and hydrochloric acid react according to the reaction Zn(s) 2HCl (aq.) ZnCl(aq.) H(g) If 0.30 mole of Zn are added to hydrochloric acid containing 0.52 mole HCl, how many moles of H are produced

The molality and molarity of a solution of HSO are 94.13 and 11.12 respectively. Calculate the density of the solution.

Calculate the molarity of the phosphoric acid solution (sp. gravity 1.426 and containing 60 by weight of pure H PO. Atomic mass of P 31)

Find the number of gmolecules of oxygen in 6.023 1024 CO molecules.

of On heating 1.763 g of hydrated barium chloride BaCl.x HO to dryness, 1.505 g anhydrous salt remained. Find the value of x.

A chemist wants to prepare diborane by the reaction 6 LiH 8BF3 6Li BF4 BH6 If he starts with 2.0 moles each of LiH BF3. How many moles of BH, can be prepared.

P4S3 80 P4010 3SO Calculate minimum mass of P4S3 is required to produce 1 gm of each product.

If the yield of chloroform obtainable from acetone and bleaching powder is 75. What is the weight of acetone required for producing 30 gm of chloroform 2CH3COCH3 6CaOCl Ca(CH3COO) 2CHCl3 3CaCl 2Ca(OH)

2PbS 30 2PbO 2SQ 3SO 2HNO3 2HO 3HSO4 2NO According to the above sequence of reactions, how much HSO4 will 1146 gm of PbS produce

The density of a solution containing 40 by mass of HCl is 1.2 gmL. Calculate the molarity of the solution.

15 g of methyl alcohol is present in 100 mL of solution. If density of solution is 0.90 g mL. Calculate the mass percentage of methyl alcohol in solution

The average concentration of Na+ ion in human body is 3 to 4 gm per litre. The molarity of Na+ ion is about.

What is the concentration of chloride ion, in molarity, in a solution containing 10.56 gm BaCl2 .8H2O per litre of solution ? (Ba = 137)

The mole fraction of solute in aqueous urea solution is 0.2. Calculate the mass percent of solute?

The concentration of Ca(HCO3 )2 in a sample of hard water is 500 ppm. The density of water sample is 1.0 gm/ml. Calculate the molarity of solution ?

Find out the volume of 98% w/w H2SO4 (density = 1.8 gm/ ml), must be diluted to prepare 12.5 litres of 2.5 M sulphuric acid solution.

500 ml of 2 M NaCl solution was mixed with 200 ml of 2 M NaCl solution. Calculate the finalvolume and molarity of NaCl in final solution if final solution has density 1.5 gm/ml.

Calculate the amount of the water which must be added to a given solution of concentration of 40 mg silver nitrate per ml, to yield a solution of concentration of 16 mg silver nitrate per ml ?

What is the molecular mass of a substance, each molecule of which contains 9 carbon atoms, 13 hydrogen atoms and 2.33 1023 g of other component

How many g of S are required to produce 10 moles and 10g of H2SO4 respectively?

P and Q are two elements which form P2Q3 and PQ2 molecules. If 0.15 mole of P2Q3 and PQ2 weighs 15.9 g and 9.3g, respectively, what are atomic mass of P and Q?

The vapour density of a mixture containing NO2 and N2O4 is 38.3 at 27C. Calculate the mole of NO2 in 100 mole mixture.

4 g of an impure sample of CaCO3 on treatment with excess HCl produces 0.88 g CO2 . What is percent purity of CaCO3 sample?

When measured at the same temperature and pressure, hydrogen reacts with oxygen to form water in the volume ratio 2 : 1. Calculate the volume of O2 gas measured at 137C and 760 mm pressure that will combine with 100 ml of H2 at 0C and 200 mm pressure.

A gaseous mixture containing 49.5 ml of hydrogen chloride and H2 gases was kept in contact with Na/Hg. The volume of mixture decreased to 42 ml. If 99.5 ml of the same mixture is mixed 49.5 ml of gaseous ammonia and then exposed to water, calculate the final volume. All measurements of volume being done under same conditions of temperature and

9 volumes of a gaseous organic compound A and just sufficient amount of oxygen required for its complete combustion, yielded, 4 volume of CO2 , 6 volumes of water vapour and 2 volumes of N2 , all volumes measured at the same temperature and pressure. If the compound A contained only C, H and N. How many volumes of oxygen are required for complete

M Upon heating a litre of HCl solution, 2.675 g hydrogen chloride is lost due to evaporation and 2 the volume of the solution shrinks to 750 ml. Calculate the number of milli moles of HC1 in 100 ml of the final solution.

Calculate the normality of a solution obtained by mixing 0.01 L of 10 seminormal KOH solution. NaOH and 40 ml of

30 ml NaCO3 solution is mixed in 20 ml 0.8 N HSO4. The resulting solution required 20 ml 0.7 N HCl for neutralization. Calculate the strength of NaCO, solution in gL, Take NaCO, as anhydrous.

1 g sample of HO solution containing x of HO by weight requires x ml KMnO4 solution for complete oxidation under acidic conditions. Calculate the normality of KMnO solution. 4

1.44 gram of Titanium (Ti) reacted with excess of O and produced x gram of nonstoichiometric compound Ti 440. Calculate The value of x be

What total volume, in litre at 600C and 1 atm, could be formed by the decomposition of 16 gm of NH4NO3 Reaction 2 NH4NO3 2N O 4HO(g)

Calculate mass of phosphoric acid required to obtain 53.4g pyrophosphoric acid.

Calculate the amount of HSO4 produced (in g) when 40 ml HO (d 0.9 gmml) reacts with 50 1SO3 at 1 atm. and 300 K, according to the following reaction HO SO3 HSO4

In one process for waterproofing, a fabric is exposed to (CH3)SiCl vapour. The vapour reacts with hydroxyl groups on the surface of the fabric or with traces of water to form the waterproofing film (CH3)SiO, by the reaction n(CH3)SiCl 2nOH 2nCl nHO (CH)SiO where n stands for a large integer. The waterproofing film is deposited on the fabric

A sample of mixture of CaCl and NaCl weighing 4.22 gm was treated to precipitate all the Ca as CaCO3 which was then heated and quantitatively converted to 0.959 gm of CaO. Calculate the mass percentage of CaCl in the mixture.

A power company burns approximately 474 tons of coal per day to produce electricity. If the sulphur content of the coal is 1.30 by weight, how many tons SO are dumped into the atmosphere each day

Calculate the percent loss in weight after complete decomposition of a pure sample of potassium chlorate. KClO3(s)KCl(s) O(g)

Cyclohexanol is dehydrated to cyclohexene on heating with conc. HSO4. If the yield of this reaction is 75, how much cyclohexene will be obtained from 100 g of cyclohexanol con. HSO4 CH10 C6H2O

How many grams of 90 pure NaSO4 can be produced from 250 gm of 95 pure NaCl

Potassium superoxide, KO, is utilised in closed system breathing apparatus. Exhaled air contains CO and HO, both of which are removed and the removal of water generates oxygen for breathing by the reaction 4KO(s) 2HO(1) 30(g) 4KOH(s) The potassium hydroxide removes CO from the apparatus by the reaction KOH (s) CO(g) KHCO3(s) What mass of KO,

500 gm of urea solution of mole fraction 0.2 is diluted to 1500 gm. Calculate the mole fraction of solute in the diluted solution

What volume of 0.8 M AlCl3 solution should be mixed with 50 ml of 0.2M CaCl solution to get solution of chloride ion concentration equal to 0.6 M

What volume of 0.2 M NaOH (in ml) solution should be mixed to 500 ml of 0.5 M NaOH solution so that 300 ml of final solution is completely neutralised by 20 ml of 2 M HPO4 solution. Assuming 100 dissociation

15 gram of methyl alcohol is dissolved in 35 gram of water. What is the mass percentage of methyl alcohol in solution (a) 30 (b) 50 (c) 70 (d) 75

The vapour pressure of a solvent is 20 torr whereas that of its dilute solution is 17 torr. The mole fraction of the solvent is (a) 0.6 (b) 0.4 (c) 0.85 (d) 0.7

The exact mathematical expression of Raoults law is nnsolute PP N P P. S P n N (b) P. n N nsolvent PoPs (d) n N n N

The vapour pressure of pure liquid A at 310C is 120 torr. The vapour pressure of this liquid in solution with liquid B is 72 torr. Calculate the mole fraction of A in solution if the mixture obeys Raoults law. (a) 0.06 (b) 0.9 (d) 0.6 (c) 0.3
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Which of the following plots represents an ideal binary mixture (a) Plot of P total (b) Plot of P, (c) Plot of total 1 P vs 1XB is linear (XB mole fraction of B in liquid phase). vs Y is linear (YB mole fraction of A in vapour phase) A 1 total vs Y is linear A (d) Plot of P total vs YB is non linear

Two liquids A B form an ideal solution. What is the vapour pressure of solution containing 2 moles of A and 3 moles of B at 300 K Given At 300 K, Vapour pr. of pure liquid A (P) 100 torr, Vapour pressure of pure liquid B (Pg) 300 torr (a) 200 torr (b) 140 torr (c) 180 torr (d) None of these

Mole fraction of vapours of A above the solution in mixture of A and B (X0.4) will be Given P 100 mm Hg and P 200 mm Hg (a) 0.4 (b) 0.8 (d) none of these (c) 0.25

A For an ideal binary liquid solution with P P, which relation between X (mole fraction of A in liquid phase) and Y(mole fraction of A in vapour phase) is correct (a) YA XB Y. A YB XB A X A YB XB

The exact mathematical expression of Raoults law is P P p P n N (b) PoP p S N n (c) n N (d) poPs p nN

A mixture contains 1 mole of volatile liquid A (P100 mm Hg) and 3 moles of volatile liquid B (P 80 mm Hg). If solution behaves ideally, the total vapour pressure of the distillate is (a) 85 mm Hg (b) 85.88 mm Hg (c) 90 mm Hg (d) 92 mm Hg

Which of the following represents correctly the changes in thermodynamic properties during the formation of 1 mole of an ideal binary solution. (a) J mol 0 AG TAS . mole fraction (b) J mol 0 AG AH TAS mole fraction (c) J mol 0 TAS AH mix AG mole fraction o (d) J mol 0 TASmix AG mix .. mole fraction

What happens to viscosity in the case of incompressible fluids as temperature is increased (a) It remains constant (b) It increases (c) It decreases (d) None of the above

Which of the following represents viscosity (a) Potential energy stored in fluid (c) Roughness of the surface (b) Resistance to fluid motion (d) The pressure difference between the two fluids

What is the SI unit of viscosity (a) Candela (b) Poiseiulle (c) Newtonm (d) No units

Which of these fluids has the highest viscosity (a) Water (b) Honey (c) Blood (d) Air

What happens to the viscosity of liquid with the increase in temperature (a) It increases (b) It decreases (c) It may increase or decrease (d) No change

Which of the following is an application of surface tension (a) Use of soaps and detergents as cleansing agents (b) Molecular structure can be elucidated by surface tension measurements through parachor values (c) Surfactants are incorporated in preparations like toothpaste (d) All of the mentioned

The vapour pressure of a solvent decreased by 10 mm of Hg when a nonvolatile solute was added to the solvent. The mole fraction of solute in solution is 0.2, what would be mole fraction of the solvent if decrease in vapour pressure is 20 mm of Hg (a) 0.2 (b) 0.4 (c) 0.6 (d) 0.8

Which of the following aqueous solution will show maximum vapour pressure at 300 K (a) 1 M NaCl (d) 1 M C2H2011 (b) 1 M CaCl (c) 1 M AICI,