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Chemistry Questions and Answers August 22, 2020

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f(x)(32x), x

1 (43x) term in x. Simplify each term. (a) Expand where x

f(x)(4x) x 4 Find the binomial expansion of f(x) in ascending powers of x, up to and including the term in x. Give each coefficient as a simplified fraction.

2x 5x10 (x1)(x2) (a) Find the values of the constants A, B and C. A 2x 5x10 (x1)(x2) Give each coefficient as a simplified fraction. (b) Hence, or otherwise, expand B C x1 x2 in ascending powers of x, as far as the term in x.

f(x) H (94x) Find the first three nonzero terms of the binomial expansion of f(x) in ascending powers of x. Give each coefficient as a simplified fraction.

(b) g(x) (c) h(x) f(x) (a) Find the binomial expansion of f(x) in ascending powers of x, up to and including the term in x. Give each coefficient in its simplest form. 6 (9 4x) Use your answer to part (a) to find the binomial expansion in ascending powers of x, up to and including the term in x, of 6 (9 8x) 6 V(9 4x) a 100 3

(a) Use the binomial expansion to show that (b) Substitute x 26 (1x)1x 2 x, 1 into x 1x to obtain an approximation to 3 1 x x Give your answer in the form where a and b are integers. b

One of the excited states of Ti has the electric configuration Ar 4s23d 4p. The number of microstates with zero total spin (S) for this configuration is (c) 27 (a) 9 (b) 15 (d) 60

4. The large container shown above is filled with a liquid of density 1.1 x 10 kgm A small hole of area 2.5 x 10 m is opened in the side of the beaker a distance below the liquid surface, which allows a stream of liquid to flow through the hole and into a beaker placed to the right of the container. At the same time, liquid is also added to the

Which one of the following is not a condensation polymer? (A) Dacron (B) Neoprene (C) Melamine (D) Bakelite

Which of the following is a chain growth polymer? (A) Polystyrene (B) Nucleic acid (C) Protein (D) Starch

In cold countries ethylene glycol is added to water in radiators of automobiles during winter. This is to : (A) lower the boiling point (B) lower the freezing point (C) reduce visocity (D) increase the vapour pressure

Heat of neutralization of strong acid and strong base is : (A) 57.1 KJ/mol (B) + 13.7 KJ/mol (C) 13.7 KJ/mol (D) + 57.1 KJ/mol

Sulphur containing amino acid is : (A) aspartic acid (B) leucine (C) glycine (D) cysteine

Sesquiterpenoids contains _________ number of isoprene units. (A) 1 (B) 2 (C) 3 (D) 4

Orange juice shows a pH of 3.0 while milk is detected to have a pH of 6 Which is true about the H+ concentration in orange juice solution? (A) 100 times less (B) 1000 times more (C) 10000 times more (D)1000 times less

The pH value of a liquid A is 3.8 and the pH value of a liquid B is 6.2. How many times as acidic as liquid B is liquid A? Round the final answer to two decimal places.

What is the pH of a solution made by mixing 35.00mL of a 0.5000M solution of HF with 37.50mL of 0.5000M solution of NaOH?

A solution with a pH of 1 is ____________ times more acidic than a solution with a pH of 2.

The most effective method of decontamination of polluted industrial wastewater is its treatment with substances that transform harmful impurities into insoluble compounds. At the same time, the precipitating reagent can be in excess or in short supply. The enterprise supplies wastewater containing 3.31 kg of lead (II) nitrate to the water

During alpha decay, N/P ratio A) Increases B) Decreases C) Remain constant D) May increase or decreas

In a process, AH 100kJ and AS 100JKmol at 400K. Then the value of AG will be A) Zero B) 100 kJ C) 50 kJ D) 60 kJ

The Henderson equation for the pH of an acidic buffer solution is A) pH = pKa +log([salt]/[acid]) B) pH = pKa +log([acid]/[salt]) C) pH = pKa -log([salt]/[acid]) D) pH = pKa -log([acid]/[salt])

The heats of formation of CO (g) and CO2 (g) are -26.4 kcal/mol and -94.kcal/mol repectively. The heat of combustion of CO will be : A) +26.4 kcal B) +94 kcal C) -67.6 kcal D) -120.4 k ca

The heat evolved when 0.50 mole of HCl is mixed with 0.2 mole NaOH solution will be : A) 57.1 kJ B) 14.3 kJ C) 11.42 kJ D) 1.14 kJ

Chlorination of benzene in presence of sunlight gives: A) Chloro benzene B) Hexachloro benzene C) Benzyl chloride D) Benzene hexachloride

The enzyme which converts starch into maltose is : A) Zymase B) Invertase C) Diastase D) maltase

Picric acid is A) Trinitro benzene B) Trinitro toluene C) Trinitro phenol D) Tribromo phenol

Which of the following shows carbylamine test: A) iso-propylamine B) Aniline C) O-toludene D) All of these

Amines can be estimated using standard solution of : A) NaOH B) Potassium permanganate C) HCl D) Sodium carbonate

Does Schrodinger equation apply to photons

Iodine oxidise thiosulphate ion to: A) Sulphite B) Dithionate C) Tetrationate D) Sulphat

The flame colour of lithium metal is A) Yellow B) Blue C) Violet D) Red

Pure gold is A) 18 carat B) 22 carat C) 26 carat D) 24 carat

Steel is heated to red hot and is rapidly cooled by dipping in water . This treatment is called : A) Tempering B) Anealing C) Quenching D) hardening

Iodoform cannot be prepared from A) CH3 -OH B) CH3 -CHO C) CH3 -CH2 -OH D) CH3 -CH(OH)-CH3

Smoke is a dispersion of A) Solid in gas B) Liquid in gas C) Gas in gas D) Gas in solid

Adsorption isobar is a plot of amount adsorbed against A) Temperature B) 1/temperature C) Pressure D) volume

Which of the following molecule has the largest RMS velocity? A) H2S B) NH3 C) CO2 D) SO2

The pH of 1*10-5M solution of NaOH is A) 5 B) 9 C) 7 D) 12

For the reaction AP, when the concentration of A is doubled, the rate becomes 8 times. The order of reaction is A) 4 B) 1 C) 3 D) 2

an example for a partially miscible liquid system with lower CST solution temperature (LCST) is : A) Phenol water B) Aniline water C) Aniline hexane D) Diethylamine-water

Which of the following pair forms an ideal solution? A) Pyridine water B) Ethyl alcohol water C) Benzene acetic acid D) Benzene - toluene

The temperature at which two crystalline forms are in equilibrium is called : A) Transition point B) Melting point C) Eutectic point D) Triple point

1 g pure calcium carbonate was found to require 50 ml dilute HCl solution for complete reaction. The concentration of HClsolution is : A) 4M B) 2M C) 0.4M D) 0.2M

Xerophthalmia is caused by the deficiency of : A) Vitamin A B) Vitamin C C) Vitamin K D) Vitamin D

Identify the fat soluble vitamin: A) Thiamine B) Nicotinic acid C) Ascorbic acid D) Calciferol

The type of glass possessing low coefficient of thermal expansion is : A) Soda glass B) Pyrex glass C) Flint glass D) Hard glass

Super oxide contain : A) O2- B) O22- C) O2- D) O

0.10 mole of a carbohydrate with empirical formula CH2O contains 1 g of hydrogen. Its molecular formula will be : A) C5H10O5 B) C6H12O6 C) C4H8O4 D) C3H6O3

Permutit is the commercial name for: A) Sodium calcium silicate B) Calcium aluminium silicate C) Sodium fluoro silicate D) Sodium aluminium silicate

The most covalent aluminum halide is : A) Aluminum chloride B) Aluminium bromide C) aluminium fluoride D) aluminium iodide

A sulphide ore of Iron is A) Magnetite B) Haematite C) Limonite D) Iron pyrites

Temporary hardness of water is due to the presence of : A) Chlorides od Ca and Mg B) Bicarbonates of Ca and Mg C) Sulphates of Ca and Mg D) Nitrates of Ca and Mg

SN1 mechanism operates in the hydrolysis of : A) t-butyl chloride B) Methyl chloride C) Ethyl chloride D) Iso-propyl chloride

Arrange the following nucleophiles in the decreasing order of their nucleophilicity NH2, NH3, C2H5NH2, CoHsNH, A) NHz NH3 C2HsNH, CoHNH, B) NH C,HsNH, NH3 CoHNH, C) NH NH3 CoHoNH, C,H5NH, D) NH C,HsNH, CoHsNH, NH3

Lactose is a disaccharide made up of : A) Glucose and Fructose B) two glucose units C) Two galactose D) Glucose and galactose

Which of the following is a purine base present in nucleic acid? A) Thymine B) Cytosine C) Uracil D) Guanine

What is Henry's Law ?

The principal constituent of turpentine oil is A) Camphor B) Menthol C) apinene D) Zingiberine

The reduction product of citral with Na(Hg)/Alcohol is : A) p-Cymene B) Geraniol C) Geranic acid D) Levulinic acid On reduction, citral gives geraniol.

The hetrocyclic ring system present in the alkaloid quinine is : A) Piperidine B) Pyrolidine-pyridine C) Quinoline D) isoquinoline

The most abundant inert gas in the atmosphere is : A) He B) Ar C) Kr D) Ne

The sulphide ores of metal concentrated by : A) Monds process B) Froath floatation C) Calcination D) Magnetic method

The number of radial nodes in 3s orbital is A) 0 B) 1 C) 2 D) 3

The bond order of O2 molecule is : A) 0 B) 1 C) 3 D) 2

1 manometer is : A) 10-8 m B) 10-9 m C) 10-7 m D) 10-10 m

Emission of electrons from metal surface on exposure to radiation is called : A) Radioactivity B) Compton effect C) Photoelectric effect D) Zeeman effect

Quantum Theory was put forward by A) Max Plank B) Maxwell C) Bohr D) De Broglie

18Ar40 and 19K40 are examples for : A) Isotopes B) Isotones C) Isomers D) Isobars

The expression for average translational kinetic energy of an ideal gas /mol is : A) RT B) 3/2RT C) 3/2KT D) KT

the number of vibrational degrees of freedom of CO2 molecule is : A) 4 B) 3 C) 5 D) 1

The number of d electrons retained in Fe3+ ( atomic number of Fe :26) A) 6 B) 3 C) 4 D) 5

Which of the following has high electron affinity A) Fluorine B) Chlorine C) Nitrogen D) Oxygen

Which of the following is paramagnetic? A) N2 B) CO C) NO D) O3

The sugar present in milk is : A) Lactose B) Galactose C) Glucose D) Maltose

The brown ring test is used for the detection of A) Sulphate B) Phosphate C) Nitrate D) Acetate

What is the hybridisation in the singlet state of carbene? A) sp B) sp2 C) sp3 D) Dsp2

Diels-Alder reaction is an example forcyclo addition A) (3+2) B) (2+2) C) (4+4) D) (4+2)

A peptide bond is A) -CO-NHB) CO-NH2- C) -CO-NHOD) -CHO-NH-

Sugar when reacted with conc.H2SO4 A) Mannitol B) Hydrogen C) Carbon D) sucrose

For soft soap---- is used A) NH4OH B) NaOH C) KOH D) Ca(OH)2

Real gases deviate from ideal behavior conditions of : A) Low pressure and high temperature B) high pressure and high temperature C) Low pressure and low temperature D) high pressure and low temperature

To which point group H2O belongs to : A) C3V B) C2h C) C2V D) D2h

How many number of molecules are present in 22.414 Liters of hydrogen at STP? A) 22.4 B) 22.4*6.022*1023 C) 6.022*1023 D) 2*6.022*1023

A property which progressively increases down a group in the periodic table is : A) Ionization potential B) Strength as reducing agent C) Electron affinity D) electronegativity

Which of the following elements is a metalloid? A) Sodium B) Cobalt C) Antimony D) tellurium

Hybridization of Be in Becl2 is A) sp B)sp2 C) sp3 D) dsp2

Which of the following is true at equilibrium A) Reactants and products are present in equal amounts B) rates of forward and backward reactions are equal C) rates of forward and backward reactions are zero D) None of these

An acid buffer can be prepared by mixing solutions of : A) NaOH and HCl B) H2SO4 and Na2SO4 C) CH3COONa and CH3COOH D) NH4Cl and NH4OH

Which of the following is a peptide hormone? A) Insuline B) Adrenaline C) Thyroxine D) Testosterone

Which is a disaccharide? A) Glucose B) Raffinose C) Sucrose D) Starch

Pyrimidine contains ---nitrogen atoms. A) 1 B) 2 C) 0 D) 3

pH of blood is in the range : A) 7.35-7.45 B) 6.35-7.4 C) 6.55-8.35 D) 8.25-8.65

The increasing accumulation of insecticides in higher organism called : A) bio-cumulation B) Bio-persistence C) Bio-concentration D) Bio-accumulation

In metallic conductors, the electricity is carried by the movement of : A) Ions B) Atoms C) Molecules D) Electrons

Baking soda is : A) NaHCO3 B) Na2CO3 C) Na2SO4 D) K2CO3

Which of the following amino acid is optically inactive ? A) Alanine B) Glycine C) Valine D) Leucine

Which of the following bases is not present in RNA? A) Adenine B) guanine C)Thymine D) Uracil

Name the alkaloid present in the poisonous herb hemlock? A) Coniine B) Nicotine C) Quinine D) Piperine