Question 1:

The half life of the first order reaction
CH₃.CHO(g)→CH₄(g)+CO(g)
If initial pressure of CH₃.CHO(g) is 80 mm and after how much time in minutes is the total pressure 120 mm?

1) 80 min
2) 120 min
3) 20 min
4) 40 min

Question 2:

pK_a of a weak acid (HA and pk_b of a weak base (BOH) are 3.2 and 3.4, respectively. The pH of their salt (AB) solution is :

1) 7.0
2) 1.0
3) 7.2
4) 6.9

Question 3:

35 g of NH₄OHis dissolved in 10L of H₂O. The percentage dissociation of NH₄OH is-
(M.wt NH₄OH - 35; pK, NH4OH - 4.75)

1) 13.4
2) 1.34
3) 26.8
4) 2.68

Question 4:

Zinc sulphate contains 22.65% of zinc and 43.9% of water of crystallization. If the law of constant proportions is true, then the weight of zinc required to produce 20g of the crystals will be

1) 45.3g
2) 4.53g
3) 0.453g
4) 453g

Question 5:

A catalyst:
(i) increases the average kinetic energy of reacting molecules
(ii) decrease the activation energy
(iii) alters the reaction mechanism
(iv) increases the frequency of collisions of reacting species.
The true statements are:

1) i, ii, iii
2) ii, iv
3) ii, iii
4) all are correct

Question 6:

A neutron has approximately the same mass as a

a alpha particle
a beta particle
an electron
a proton

Question 7:

What is the mass number of an atom which contains 28 protons, 28 electrons, and 34 neutrons?
 
 1. 28
 2. 56
 3. 62
 4. 90

Question 8:

Petroleum consists mainly of

1)  aromatic hydrocarbons

2)  aliphatic alcohols

3)  aliphatic hydrocarbons

4)  none of these

Question 9:

Biochemical Oxygen Demand(BOD) value can be a measure of water pollution caused by the organic matter. Which of the following statements is correct?

1) Polluted water has BOD value higher than 10 ppm

2) Aerobic bacteria decrease the BOD value

3) Anaerobic bacteria increase the BOD value

4) Clean water has BOD value higher than 10 ppm

Question 10:

The following titration method is given to determine the total content of the species with variable oxidation states. Answer the question given at the end of it. 

A quantity of 25.0 mL of solution containing both Fe²⁺ and Fe³⁺ ions is titrated with 25.0 mL of 0.02 M KMnO₄? (in dilute H₂?SO₄?). As a result, all of the Fe²⁺ ions are oxidised to Fe³⁺ ions. Next 25 mL of the original solution is treated with Zn metal. Finally, the solution requires 40.0 mL of the same KMnO4? solution for oxidation to Fe³⁺.

MnO₄?⁻ + 5Fe²⁺ + 8H⁺→Mn²⁺ + 5Fe³⁺+4H₂?O
The molar concentration of Fe2+ in the original solution is :

1) 0.01M

2) 0.02M

3) 0.10M

4) 0.20M

Question 11:

Phenol is most easily soluble in

1. sodium carbonate solution 
2. sodium hydroxide solution 
3. dilute HCl 
4. both sodium hydroxide and dilute HCl 

Question 12:

Alkaline earth metals burn in nitrogen and form nitrides of type M₃N₂. which of them is volatile in nature?

1) Mg₃N₂
2) Ba₃N₂
3) Ca₃N₂
4) Be₃N₂

Question 13:

H₂(g) and O₂(g), can be produced by the electrolysis of water. What total volume (in L ) of O₂ and H₂ are produced at STP when a current of 30 A is passed through a K₂SO₄(aq) solution for 193 minute?

1) 20.16
2) 60.48
3) 80.64
4) 40.32

Question 14:

One mole of the complex compound Co(NH₃)₅Cl₃ gives three moles of ions on dissolution in water. One mole of the same complex reacts with two moles of AgNO₃ solution to yield two moles of AgCl(s). The structure of complex is: 

1) $$[Co(NH_{3})_{4}Cl]Cl_{2}.NH_{3}$$
2) $$[Co(NH_{3})_{5}Cl]Cl_{2}$$
3) $$[Co(NH_{3})_{3}Cl_{3}]2.NH_{3}$$
4) $$[Co(NH_{3})_{4}Cl_{2}]Cl.NH_{3}$$

Question 15:

Silver iodide is used for producing artificial rain because AgI

1)  is insoluble in water

2)  has crystal structure similar to ice

3)  is easy to spray at high altitude

4)  is easy to synthesize

Question 16:

Equanil is an example of:

1) artificial sweeteners
2) tranquilisers
3) antihistamines
4) antifertility drugs

Question 17:

Equation for the following reaction.
$$Cu+{ xHNO }_{ 3 }\rightarrow Cu\left( { NO }_{ 3 } \right) _{ 2 }+{ 2H }_{ 2 }O+{ 2NO }_{ y }$$
Find the value of $$x$$ and $$y$$.

1) x=1,y=2
2) x=2,y=3
3) x=4,y=2
4) x=4,y=3

Question 18:

The most suitable method of separation of 1:1 mixture of ortho and para-nitrophenols is:

1) sublimation

2) steam distillation

3) crystallisation

4) chromatography

Question 19:

The fragrance of the flower is due to the presence of some steam volatile organic compounds called essential oils. These are generally insoluble in water at room temperature but are miscible with water vapour in the vapour phase. A suitable method for the extraction of these oil from the flower is:

1) distillation with reduced pressure

2) distillation

3) steam distillation

4) chromatography

Question 20:

Coal tar is obtained as a by product during :

1) Destructive distillation of wood

2) Destructive distillation of coal

3) Destructive distillation of bones

4) Steam distillation of light oil

Question 21:

The ratio of number of moles of KMnO₄ and K₂Cr₂O₇ required to oxidize 0.1 mol Sn²⁺ to Sn⁺⁴ in acidic medium:

1) 6 : 5
2) 5 : 6
3) 1 : 2
4) 2 : 1 

Question 22:

Four Cl₂ molecules undergo a loss and gain of 6 mole of electrons to form two oxidation states of Cl in auto redox change. What are the +ve and −ve oxidation states of Cl in the change:

1) Cl⁵⁺,Cl^o
2) Cl⁷⁺,Cl^-
3) Cl³⁺,Cl^o
4) Cl³⁺,Cl^-

Question 23:

When carbon monoxide is passed over solid caustic soda to heated to 200⁰ C, it form:

1) H-COONa
2) CH₃COONa
3) Na₂CO₃
4) NaHCO₃.

Question 24:

The composition of the equilibrium mixture (Cl₂?2Cl)which is attained at 1200?C is determined by measuring the rate of effusion through a pinhole . It is observed that at 1.80 mm Hg pressure , the mixture effuses 1.16 times as fast as krypton effuses under the same conditions. Calculate the fraction of chlorine molecules dissociated anto atoms.(Atomic wt of Kr = 84)

1)13.7%
2)13%
3)12%
4)10%

Question 25:

Calculate the standard free energy change for reaction,
2Ag + 2H⁺ → H₂ + 2Ag⁺
E° for Ag⁺ + e- → Ag is 0.80V

1) +154.4 kJ
2) +308.8 kJ
3)-154.4 kJ
4)-308.8 kJ

Question 26:

Major chemical species present in troposphere is ,

1) $$O_2, N_2$$

2) $$CO_2, H_2O$$

3) Both A and B

4) None of these

Question 27:

Carbon monoxide emitted by automobiles prevents oxygen transport to body tissues by:

1) changing O₂ to CO₂

2) destroying haemoglobin

3) forming a stable compound with haemoglobin

4) obstructing the reaction of oxygen with haemoglobin

Question 28:

The following reaction is used for the preparation of oxygen gas in the laboratory.
$$2KClO_{3} (s) \xrightarrow[Catalyst]{Heat} 2KCl (s) + 3O_{2} (g)$$
Which of the following statement is correct about the reaction?

1)It is a decomposition reaction and endothermic in nature
2)It is a combination reaction
3)It is a decomposition reaction and accompanied by release of heat
4)It is a photochemical decomposition reaction and exothermic in nature

Question 29:

In benzene, all the six C-C bonds have the same length because of :

1) Isomerism
2) chain isomerism
3) resonance
4) hybridisation.

Question 30:

The alkene that will give the same product with HBr in the absence as well as in the presence of peroxide is?

1) 2−butene
2) 1−butene
3) propene
4) 1−hexene

Question 31:

An alkyl bromide, RBr of molecular weight 151 is the exclusive product of bromination of which hydrocarbon?

1) Dodecane
2) 2,2 - dimethylpropane
3) 2,2 - dimethylhexane
4) 2,2,3 - trimethylheptane

Question 32:

Silver reacts with hydro chloric acid to give

1) AgCl
2) H₂
3) AgH
4) no reaction

Question 33:

In which of the following reactions, H2?O2? acts as reducing agent?

A) H_2?O_2?? +  2H⁺  + 2e− → 2H_2??O
B) H_2??O_2??  − 2e− → O_2? ?+ 2H+
C) H_2??O_2? ?+ 2e− → 2OH−
D) H_2?O_2? ??+ 2OH⁻2e⁻ →O_2? ?+ 2H_2??O

1) A, C
2) B, D
3) A, B
4) C, D

Question 34:

Three sparingly soluble salts A₂B, AB and AB₃ have the same values of solubility products (K_sp). In a saturated solution the correct order of their solubilities is

1) AB > A₂B > AB₃
2) AB₂ > AB > A₂B
3) AB₃ > A₂B > AB
4) AB > AB₃ > A₂B

Question 35:

If the lattice parameter of Si is 5.43 Å and the mass of Si atom is 28.08×1.66×10⁻²⁷ kg, the density of silicon in kg m⁻³ is :

(Given: Silicon has diamond cubic structure.)

1) 2330
2) 1115
3) 3445
4) 1673

Question 36:

Silk and woolen clothes are often damaged by

1) Flies

2) Insects

3) Bacteria

4) Animals

Question 37:

Reduction of a metal oxide by excess carbon at high temperature is a method for the commercial preparation of some metals. This method Can be successfully applied in the case of :

1) BeO and Al₂O₃
2) ZnO and Fe₂O₃
3) CaO and Cr₂O₃
4) BaO and U₃O₈

Question 38:

Which of the following is used as a catalyst for preparing Grignard reagent ?

1) iodine power
2) iron power
3) manganese dioxide
4) activated charcoal.

Question 39:

Which of the following compounds will not undergo Friedel -Craft's reaction easily?

1) Cumene
2) Xylene
3) Nitrobenzene
4) Toluene

Question 40:

5.0 cm³ of H₂O₂  liberates 0.508 g of iodine from an acidified KI solution. The strength of H₂ O₂   solution in terms of volume strength at STP is:

1) 6.48 volumes
2) 4.48 volumes
3) 7.68 volumes
4) none

Question 41:

What is the n factor or valancy factor of ozone during the change 2O_3? → 3O₂??

1) 2
2) 4
3) 6
4) 8

Question 42:

Glycerol is purified by

1) Steam distillation

2) Sublimation

3) Simple distillation

4) Vacuum distillation

Question 43:

The heat liberated when 1.89g of benzoic acid is burnt in a bomb calorimeter at 25^oC increases the temperature of 18.94kg of water by 0.632^oC. If the specific heat of water at 25^oC is 0.998 cal/g deg, the value of the heat of combustion of benzoic acid is

1) 881.1 kcal
2) 771.4 kcal
3) 981.1 kcal
4) 871.2 kcal

Question 44:

Sodium metal cannot be stored in

1)  toluene

2)  alcohol

3)  kerosene

4)  benzene

Question 45:

Bauxite is concentrated by :

1) Chemical method
2) Roasting
3) Magnetic separation
4) Froth floatation process.