10+2 level Chemistry Fully Solved for PMT PET IIT JEE

10+2 level SOLVED PAPER. Chemistry For AIEEE, IIT-JEE, PMT, Other State / National Level Engg / Medical Entrance
Fully Solved Question Paper Chemistry
1. Heat of neutralization of strong acid and strong base is constant and equal to:

(a) 10.7 kcal

(b) 13.7cal

(c) 23.7 kcal

(d) 33.7 kcal

Ans. (b)

2. The first law of thermodynamics is represented by:

(a) ΔE=ΔQ÷ΔW

(b) ΔE=ΔQ+W

(c) ΔE=Q+W

(d) ΔE=Q-W

Ans. (c)

3. The metal that forms a self protecting film of oxide to prevent corrosion is:

(a) Al

(b) Au

(c) Ag

(d) Cu

Ans. (a)

4. H₂O₂ is reducing agent in the reaction:

(a) Ag₂O+ H₂O₂ → 2Ag+ H₂O+O₂

(b) 2K1+ H₂O₂ → 2KOH+ I₂

(c) H₂O₂+ SO₂ → H₂SO₄

(d) PbS + 4H₂O₂ → PbSO + 4H₂O

Ans. (a)

5. The hybridization shown by six carbon atoms in benzene is:

(a) 3sp³ 3sp

(b) 3sp³ 3sp²

(c) 3sp³ sp²

(d) 6sp²

Ans. (d)



6. The molarity of a solution containing 5 g of NaOH in 250 mL solution:

(a) 0.5

(b) 1.0

(c) 1.5

(d) 2.0

Ans. (a)

7. A gas expands isothermally against a constant external pressure of 1 atmosphere from a volume of 10 dm³ to a volume of 20 dm³. In this process it absorbs 800 J of thermal energy from its surroundings. The ?U for the process in Joule is:

(a) +113J

(b) -113J

(c) -213J

(d) +313J

Ans. (c)

8. The most stable is:

(a) NaH

(b) RbH

(c) KH

(d) LiH

Ans. (d)

9. Nitrobenzene and hydrogen in presence of zinc and HC1 combines to form:

(a) Azobenzene

(b) Benzene

(c) Azoxybenzene

(d) Aniline

Ans. (d)

10. Ethyl alcohol is soluble in water due to:

(a) Acidic nature

(b) Basic nature

(c) Formation of hydrogen bond

(d) Dissociation in water

Ans. (c)

11. In a chemical equilibrium rate constant of forward reaction is 75⁹ x10^-4 and the equilibrium constant is 1.5. The rate constant of backward reaction is

(a) 2.5x10⁴

(b) 5x10^-4

(c) 2.5 x10^-4

(d) 5 x 10⁴

Ans. (b)



12. Conversion of starch into maltose takes place by the enzyme:

(a) Invertase

(b) Maltase

(c) Diastase

(d) Zyrase

Ans. (c)

13. The oxide which forms dimer is:

(a) N₂O₅

(b) N₂O

(c) NO₂

(d) N₂O₃

Ans. (c)

14. The hardest naturally occurring substance is:

(a) Iron

(b) Graphite

(c) Diamond

(d) Astatine

Ans. (c)

15. Wax belongs to the class:

(a) Alcohol

(c) Ether

(b) Ester

(d) Acid

Ans. (b)

16. The chloramphenicol is an example of:

(a) Antiseptic

(b) Antibiotic

(c) Analgesics

(d) Antipyretics

Ans. (b)

17. The heat of formation of CO₂ is 95 kcal. The amount of carbon which on burning will evolve 1000 kcal is

(a) 12.63 g

(b) 17.95 g

(c) 126.3 g

(d) 179.5 g

Ans. (c)

18. Normality of orthophosphoric acid having purity of 70% by weight and specific gravity 1.54 is:

(a) 11N

(b) 22N

(c) 33N

(d) 44N

Ans. (c)

19. Chloroform and conc. HNO3 reacts to produce:

(a) CHC1₂HNO₃

(c) CC1₃NO₂

(b) CHC1₂NO₃

(d) CHC1NO₃

Ans. (c)



20. Gold number is associated with:

(a) Protective colloids

(b) Purple of cassius

(c) Amount of pure gold

(d) Electrophoresis

Ans. (a)

21. The number of double bonds in gammexane is

(a) 0

(b) 1

(c) 2

(d) 3

Ans. (a)

22. Amino acids are the building blocks of:

(a) Fats

(b) Vitamins

(c) Carbohydrates

(d) Proteins

Ans. (d)

23. The number of atom in 4.25 g of NH₃ is:

(a) 2.054 x 10²³

(b) 3.034 x 10²³

(c) 3.044 x 10²³

(d) 6.023 x 10²³

Ans. (d)

24. The conjugate acid of NH₃ is:

(a) NH

(b) NH₂OH

(c) NH₃

(d) N₂H₄

Ans. (a)

25. The first ionisation potential is maximum for:

(a) Lithium

(b) Hydrogen

(c) Iron

(d) Uranium

Ans. (b)

26. Adiabatic process involves:

(a) ΔE=0

(bΔV=0

(c)ΔW=0

(d) Δq=0

Ans. (d)

27. Which of the following explains the sequence of filling the electrons in different shell?

(a) Aufbau principle

(b) Hund’s rule

(c) Octet rule

(d) All of the above

Ans. (a)

28. The rate of reaction depends upon:

(a) Molar concentration

(b) Atomic mass

(c) Equivalent mass

(d) None of the above

Ans. (a)

29. The purest form of iron is:

(a) Pig iron

(b) Wrought iron

(c) Steel

(d) None of these

Ans. (b)

30. The largest size of the ion is:

(a) CF

(b) Ca₂

(c) K

(d) S₂

Ans. (d)

31. The empirical formula of a compound is CH₂O. Its molecular weight is 180. The molecular formula of the compound is:

(a) C₃H6O₃

(b) C₆H₁₂O₆

(c) C₄H₈O₄

(d) C₅H₁₀O₅

Ans. (b)

32. The Bohr’s orbit radius for the hydrogen atom (n =1) is approximately Q530 Å. The radius for the first excited state (n = 2) orbit is

(a) 1.08 Å

(b) 2.12 Å

(c) 3.24 Å

(d) 4.36 Å

Ans. (b)

33. Roasting of an ore is done in:

(a) Presence of air

(b) Absence of air

(c) Vacuum

(d) None of these

Ans. (a)

34 The dissociation constant of two acids HA₁ and HA₂ are 3.0 x 10^-4 and 1.8 x 10^-5 respectively. The relative strength of acid HA₁: HA₂ is:

(a) 16:1

(b) 1:16

(c) 4:1

(d) 1:4

Ans. (c)

35. Natural rubber is a polymer of:

(a) 1, 4-butadiene

(b) Ethylene

(c) Isoprene

(d) Terephthalic acid

Ans. (c)

36. The alkyl halide is converted into alcohol by:

(a) Elimination

(b) Halogenations

(c) Addition

(d) Substitution

Ans. (d)

37. The gas used in air ships is:

(a) He

(b) Ne

(c) Ar

(d) Xe

Ans. (a)

38. An aqueous solution of ammonium acetate is:

(a) Acidic

(b) Basic

(c) Neutral

(d) None of these

Ans. (c)

39. The highest melting halide is:

(a) NaF

(b) NaCl

(c) NaBr

(d) Nal

Ans. (a)

40. The pH of a 10’° molar solution of HCl in water is

(a) 6.0

(b) 7.0

(c) 10

(d) 14

Ans. (b)