Chemistry Questions and Answers April 13, 2020

What is the product formed when pentyne reacts with disiamylborane (A) Pentanol (B) Pentanone (C) Pentanal (D) Pentan2ol

The following Absorbance vs concentration of nitrite graph is obtained for a set of data Absorbance Vs Concentration y 1.6628x 0.0373 R2 0.9893 1.8 1.6 1.4 1.2 1 0.8 0.6 0.4 0.2 0.2 0.4 0.6 0.8 Concentration of nitrite (mgL) Determine the concentration of unknown solution for which the absorbance is determined as 0.69 A. More data is required .

What is the major product formed in the following reaction HBr A) B) Br Br D) C) Br Br

Identify the structure of the product formed in the following reaction NH,NH, Product A) B) H HO D)

Which compound is more soluble in an acidic solution than in a neutral solution (A) PbBr, (B) CuCl (C) AgI (D) BaF,

The solubility product of a metal carbonate (in which the metal is in 1 oxidation state) is 7.3 x10 10. Calculate its solubility, if the molar mass of the metal carbonate is 250 gmol. (A) 0.675 gL (B) 0.00142 gL (C) 0.00675 gL (D) 0.142 gL

From the following reactions, determine the reactions that are exothermic. (i) F(g)e F (g) (ii) CaCl, (s) Ca(s)Cl, (g) (iii) NaCl(s) Na (8)Cl (g) (iv) K(g)e K (g) (A) (i) and (iv) are exothermic (B) (ii) and (iii) are exothermic (C) All the reactions are exothermic (D) (i), (ii), and (iii) are exothermic

Show the relation between these two compounds OH H HO and H. OH (A) Diastereomers (B) Identical (C) Enantiomers (D) Meso compound

Calculate the de Broglie wavelength of a body of mass 1 kg moving with a velocity of 1500 m s. (A) 4.42x10 31 m (B) 2.45 x103 m (C) 4.42 x103s m (D) 3.32 x 103 m

Work function for sodium metal is 1.82 eV, calculate the threshold frequency v, for sodium. (A) 2.75 x10 Hz (B) 2.92x1019 Hz (C) 4.40x10 Hz (D) 4.40x102 Hz

Which of the following is correct for the rotational spectrum of a diatomic molecule (A) The spectrum consists of equally spaced lines (B) The distance between the lines is equal to 2B (C) The space between the lines depend on the molecule (D) All the options are correct

In which of these solutions will HNO, ionize less than it does in pure water (A) 0.10 M NaCl (B) 0.10 M KNO, (C) 0.10 M NaOH (D) 0.10 M NaNO,

Which of the following equations represent the ClausiusClapeyron equation vap (A) dT T(V,V.) P2 AraH(1 1 vap (B) In P1 3D R T T, (C) Both (A) and (B) are correct (D) Only option (B)

Choose the correct ground state term symbol of high spin octahedral Ir. 3 A)F B)D C) F D) S

1What is the formal charges on B and Br (with double bond) in the following structure Br b) 1, 1 c) 1, 1 d) 0, 1 a) 0, 0 Br Br ..

II.5.2.14) 20.0g helium and 20.0g of an unknown diatomic gas are put together in a 1500mL vessel. The temperature is 298 K and the pressure in the vessel is 86.11 atm. What unknown gas is it about?

2.21) balance the following redox reaction using the semi-reaction method: in basic environment (KOH): work in steps chromium(III)hydoxide with dibromo in basic medium (KOH) gives potassium bromide, potassium chromate (with chromate ion being CrO - 4 ) and ...

What is the excitation energy of the 116Sb compound nuclei formed by the bombardment of 103Rh with 50 MeV 13C ions?

Q-1Which is more stable compound out of the following : Cyclopropenone or Cyclopentadienone? [ Hint-Draw structure of both organic (cyclic ) compounds]

1,2product HBr 1,4product

In which of the following pairs of Fatty acids does the First listed acid have a higher meltiny Point than the second listed below, 161 acidt I lio acid 180 acid t ao.0 acid 181 acid t 183 acid 163 acid t a00acid

Consider the reaction: Fe 3 O 4 (s) + 4 H 2 (g) 3 Fe(s) + 4 H 2 O(g) Using standard thermodynamic data at 298K, calculate the free energy change when 2.48 moles of Fe 3 O 4 (s) react at standard conditions. G rxn = kJ 2.)Consider the reaction:

Give general information about zirconium metal complex as a catalyst in urethane coating reaction, mention the cost, activity, selectivity and sensitivity of it

(3) A flask contains a sample of mercury. The system is stored at room temperature of 25.00 C. At what temperature (in both K and C) would the system have to change to in order to triple the vapor pressure of mercury in the flask

A sample of the inner part of a redwood tree felled in 1874 was shown to have 14 C activity of 4.29 dpm/g. Calculate the approximate age of the tree. Use 13.4 dpm/g for the value of A 0 . t 1/2 of 14 C = 5730 years (Round your answer to a whole number)

1018. Syntheses (continued) 14. 1. LDA 2. CHI

eGrawHill Conn. (Review Topics CHEMWORK Give the IUPAC name for this compound. Please note that your answer may not contain any typographical errors a Submit Show Hints Retry Entire Group 7 more group attempts remaini Submit Answer

Fill in the Blanks (b) ammonium chloride and ammonioum hydroxide (c) sulphuric acid and sodium sulphate A (d) sodium chloride and sodium hydroxide. 1. The conjugate base of HSO, in aqueous solution is. 3. The pH of a 10 molar solution of HCl in water is (1981 I Mark) (1982 I Mark) Anelement which can exist as a positive ion in acidic sokution

During spring break you are pianning on taking a road trio across Europe. To properly budget for gas you need to convert European gas prices to dollars per gallon, Gas in Sweden costs 14.78 KronaLiter. How much will you pay in dollarsGallon to drive across Sweden 1 Krona 0.113 Euros, 1 Euro 1.36 dollars, 3.79 Liters 1 gallon O 3.55 gallon O 2.27

Sri Chaitanya IIT Academy.,India 25 The gas Az in the left flask allowed to react with gas Bz present in right flask as B2 2 mole 4 mole I liter 3 liter at 27C at 27C A(8) B2 (8) 2 AB(g) Kc 4 at 27C What is the concentration of AB when equilibrium is established (A) 1.33M (B) 2.66M (C) 0.66M (D) 0.33M

Question 8 For the polyprotic acid histidine (HisH3), the hydrogens in bold can be lost. When HisHg is titrated v to reach the second pKa Another way of asking this in when presented with a titration curve of HisH A. 45 mL B. 37.5 mL C. 30 mL D. 15 mL E. 22.5 mL

After filtering your final product, you find that your product is still wet, but you proceed to take a melting point anyways. The literature melting point of luminol is 319 C. What do you expect the melting point of your luminol to be? What would you expect the yield to be? Would it be an accurate yield?

Among Cl - , Ar, K + , Ca 2+ , Br - , Kr, Rb + , and Sr 2+ , which one has the largest radius? Question H: Among Cl - , Ar, K + , Ca 2+ , Br - , Kr, Rb + , and Sr 2+ , which one has the largest ionization energy? Question I: When H + (aq) reacts with Fe(s) to produce Fe 2+ (aq) and hydrogen gas, is H + (aq) an acid, base, oxidizing agent, or

A 1L of well water which consists of magnesium was made basic with KOH, which precipitated most of the magnesium as magnesium hydroxide. The product was then titrated with 20,21 mL of 0,01123 M EDTA using a culminate indicator, which is the EDTA indicator. Calculate the water hardness in terms of MgSO4 in ppb.

If 32P-labeled ATP provides for the reactions of glycolysis, which of the following would be TRUE about 1.3 biphosphoglycerates? A. 50% of 1,3-bis phosphoglycerate would contain 32P B. 100% of 1,3-bis phosphoglycerate would contain 32P on carbon 1 C. 100% of 1,3-bis phosphoglycerate would contain 32 P on carbon 3 D. 50% of 1,3-bis phosphoglycerate

The hydroperoxide (ROOH) was treated with Dimethyl Sulfide (DMS) resulting in alcohol (OH). Please show the mechanism and arrow-pushing of how the product was produce, thank you!

HC CH3 H,C. HC CH3 HC S. CH3

You have prepared 0.50 m solutions of the following solutes. Please order the solutions of the solutes in order of increasing freezing points A. NAOH B. C,H,O6 C. (NHA)3PO4 D. BaBr2

To 500 ml of 0.150 M AGNO3 solution were added 500 mL of 1.09 M Fe2 solution and the reaction is allowed to reach and equilibrium at 25 C. Ag (aq.) Fe2 (aq.) Fe ( For 25 mL of the solution, 30 mL of 0.0832 M KMNO4 were required for oxidation. Calculate equilibrium constant for the reaction at 25 C.

At 627C and one atmosphere pressure SOzis partially dissociated into SO, and O2 by SO3(9) SO9) O2) The density of the equilibrium mixture is 0.925 glitre. What is the degree of dissociation

The degree of dissociation of HI at a particular temperature is 0.8. Calculate the volume (in lit) of 2M Na, S203 solution required to neutralise the iodine present in a equilibrium mixture of a reaction when 2 mole each of H2 and I2 are heated in a closed vessel of 2 litre capacity. Backspace

An increase in pressure would favour the following reaction (A) N2g) O29) 2NO) (B) 2SO2(9) O2 (9) 2SO3(9) (C) PCI5(0) PCI2) Clato) (D) H2(g) I2() 2HI

The value of Kp for the reaction 2H2 S(9) 2H2(9) S2() is 1.2 x 10 2 at 1065C. The value of Kc for the reaction is (A) 1.2 x 102 (B) 1.2 x 102 (C) 83 (D) 1.2 x 102

The active mass of 5.6 litres of O2 at STP is (A) 5.6 22.4 (B) 85.6 (C) 32 5.6 (D) 0.25 5.6

Which of the following reactions can be followed by its colour change (A) SO2) 12 O2) SO3() (B) N2(g) 3H2(9) 2NH3(g) (C) 2HI) H219) I0) (D) C (graphite) CO2) 20

The following is a reversible reaction (A) KCIO3 heated in a sealed tube (B) NazCO3 heated in a closed vessel (C) CaCO3 heated in a closed vessel (D) CH4 heated with excess of O2 in a closed vessel

For the reaction A(g) B(g) C(g), Kp at 400 Cis 1.5 x 10 and Kp at 600C is 6 x 103. Then the incorrect statement is (A) the reaction is an exothermic one (B) Increase in temperature increases the formation of B (C) Increase in pressure increase the formation of A (D) A decrease in temperature

One mole of N2Oo) is kept in a closed container along with gold catalyst at 450 Kunder one atmosphere. It is heated to 900 K when it dissociates to N2o) and O2lo) giving an equilibrium pressure of 2.4 atm. The degree of dissociation of N2O(g) is (A) 20 (B) 40 (C) 50 (D) 60

Two moles of an equimolar mixture of two alcohols, R1 OHand R2 OH are esterified with one mole of acetic acid. If 80 of the acid is consumed and the quantities of ester formed under equilibrium are in the ratio of 32 respectively, the value of the equilibrium constant for the esterification of R1 OHwith acetic acid is (A) 3.3 (B) 3.7 (C) 3.5 (D)

When 20g of CACO3 were put into 10 litre flask and heated to 800 C, 35 CACO, remained unreacted at equilibrium, Kp for decomposition of CACO3 is (A) 1.145 atm (B) 0.145 atm (C) 2.145 atm (D) 3.145 atm

For the reaction N2O4(9) 2NO21), if degrees of dissociation of N20, are 25, 50 75 and 100, the gradation of observed vapour densities is (A) di d2 da d4 (B) d4 d3 d2 di (C) di dz d3 d4 (D) None

The reactions PCI5) PClo) Cl) and COCl) CO) Clao) are simultaneously in equilibrium in an equilibrium box at constant volume. A few moles of CO) are later introduced into the vessel. After some time, the new equilibrium concentration of (A) PCI will remain unchanged (B) Cl, will be greater (C) PCl, will become less (D) PCI5 will become greater

Dissociates as. XY2) XY) Y) When the initial pressure of XY, is 600 mm of Hg, the total pressure developed is 800 mm of Hg. Kpfor the reaction is (A) 200 (B) 50 (C) 100 (D) 150

The equilibrium constant for a reaction A BCD is 1 x 10 2 at 298 K and is 2 at 273 K. The chemical process resulting in the formation of C and D is (A) exothermic (B) endothermic (C) unpredictable (D) there is no relationship between AH and K

In a vessel containing SO2, SO, and Oz at equilibrium, some helium gas is introduced so that total pressure increases while temperature and volume remain the same. According to the Le Chateliers principle, the dissociation of SO3 (A) Increases (B) decreases (C) remains unaltered (D) change unpredictably

For a reversible reaction, the rate constants for the forward and backward reactions are 2.38 x 101 and 8.15 x 105 respectively. The equilibrium constant for the reaction is (A) 0.342 (B) 2.92 (C) 0.292 (D) 3.42

Consider the following reaction 2NO Br2 2NOB. a. Kp for the reaction is equal to 28.4 at 298 K. If PNO 100 mm Hg and PBr2 200 mm Hg, find the partial pressure of NOB.. b. If the reaction vessel is compressed until the partial pressure of NO is 150 mm Hg, and no reaction takes place, determine the partial pressures of molecular bromine and NOBR.

In which orbital is the lone pair electron of pyrrole nitrogen present (A) sp (B) sp (C) sp (D) p

The change in enthalpy for the reaction A P is x kJmol. What does the enthalpy change for the reaction PA (A) x kJmol (B) x kJmol (C) 0 kJmol (D) 2x kJmol

Draw the structure of (2Z,5Z)3bromohepta2,5diene. Br A) B) Br C) D) Br Br

Calculate the moment of inertia for HCl molecule from the given value of rotational constant, B 10.40 cm. (A) 2.68 x1047 kg m kg m (C) 2.68 x 1051 kg m (D) 4.21 x104 kg m (B) 4.211051 2

The change in enthalpy for the reaction A P is x kJmol. What does the enthalpy change for the reaction PA (A) x kJmol (B) x kJmol (C) 0 kJmol (D) 2x kJmol

Enthalpy of combustion of the reaction CH, (g)0,(g) Co, (g) H,0(g) is 890 kJmol. Calculate the how much heat is released when 25.0 g of methane is combusted. (A) 1390.6 kJ (B) 1390.6 kJ (C) 890 kJ (D) 890 kJ

A chromatography column with a length of 10.3 cm and inner diameter of 4.61 mm is packed with a stationary phase that occupies 61.0 of the volume. If the volume flow rate is 1.13 mLmin, find the linear flow rate. (A) 17.4 cmmin (B) 15.4 cmmin (C) 14.7 cmmin (D) 15.4 cmmin

What is the major product formed, when toluene undergoes FriedelCrafts alkylation with vinyl chloride CH3 CH3 (A) (B) CH3 CH3 (C) and (D) No Reaction

The complex Co(ox)(PMe, ), (NH,)C1shows total number of isomers is ... .. A) 5 ) 4 C) 3 D) 2

Identify the number of signals for the following compound in HNMR spectrum. OH H2 H2 H3CC C C CH3 (A) 7 () 6 () 5 (D) 4

Calculate the value of the characteristic times for the tiny oildrop in the Millikan oildrop experiment when its terminal speed is 6.1x10 ms. (A) 110 s (B) 9x106 (C) 6.2x10 s (D) 2x10 s S

Part A Arrange the following substances in order of decreasing magnitude of lattice energy. Rank from largest to smallest magnitude of lattice energy. To rank Items as equivalent, overlap them. ResetH RbBr Bao Largest magnitude Smallest magnitude Cao KCI

CO9TOSQ8579 The mass spectrum of an unknown compound has a molecular ion peak with a relative intensity of 56.11 an an M1 peak of 5.70. How many carbon atoms are in the compound (Fill in an integer number) Question Attempts 0 of 1 used SAVE FOR LATER SUBMIT ANSWER