SMATEE TEST SERIES 23 CHEMISTRY

1. Among the three conformations of butane the order of stability follows the sequence

a) eclipsed > gauche > staggered
b) eclipsed > staggered > gauche
c) staggered > gauche > eclipsed
d) gauche > staggered > eclipsed

2. The number of pi bonds in naphthalene is

a) 5
b) 6
c) 3
d) 4

3. Which of the following can exhibit geometrical isomerism?

a) But-2-yne
b) But-2-ene
c) But-1-ene
d) Butan-2-ol.

4. Elimination reaction of 2-bromopentane to form pent-2-ene is
(i) ẞ-Elimination reaction
(ii) Follows Zaitsev rule
(iii) Dehydrohalogenation reaction
(iv) Dehydration reaction

a) (ii), (iii), (iv)
b) (i), (ii), (iv)
c) (i), (ii), (iii)
d) (i), (iii), (iv)

5. The IUPAC name of the compound :
CH3-CO-CH2-CH2OH is

a) 3-oxobutan-1-ol
b) 1-Hydroxybutan-3-one
c) 4-Hydroxybutan-2-one
d) 2-oxobutan-4-ol

6. The pH of 0.1 M solution of the following salts increases in the order

a) NaCl < NH₄Cl < NaCN < HCl
b) HCl < NaCl < NaCN < NH₄Cl
c) NaCN < NH₄Cl < NaCl < HCl
d) HCl < NH₄Cl <NaCl < NaCN

7. A 50 mL solution of strong acid of pH = 1 is mixed with a 50 mL solution of strong acid of pH = 2. The pH of the mixture will be nearly?

a) 2.46
b) 12.12
c) 1.26
d) 4.26

8. The solubility of BaSO₄ in water is 2.42 × 10^-3 g/L at 298 K. The value of solubility product (K_sp) will be (given molar mass of BaSO₄ = 233 g/mol)

a) 1.08 × 10^-10 mol²L^-2
b) 1.08 × 10^-12 mol²L^-2
c) 1.08 × 10^-14 mol²L^-2
d) 1.08 × 10^-8 mol²L^-2

9. Which of the following statement is false?

a) ∆G = 0 at equilibrium state of a chemical reaction
b) ∆S = 0 at equilibrium state of a chemical reaction
c) ∆H ≠ 0 at equilibrium state of a chemical reaction
d) A chemical reaction is in its most stable state at equilibrium

10. A 0.25 M solution of ammonium chloride, NH₄Cl was found to have a pH of 2.75. What is K_b for ammonia, NH₃?

a) 10^-9.1
b) 10^-8.2          
c) 10^-6.1
d) 10^-5.2

11. Which of the following compounds exhibits geometrical isomerism?

a) C₂H₅Br
b) (CH)₂(COOH)₂
c) CH₃CHO
d) (CH2)₂(COOH)₂

12. Which of the following compounds has the highest boiling point?

a) CH₃CH₂CH₂Cl
b) CH₃CH₂CH₂CH₂Cl
c) CH₃CH(CH₃)CH₂Cl
d) (CH₃)₃CCl

13. Kolbe’s reaction is used in obtaining

a) anisole from phenol
b) salicylaldehyde from phenol and CHI3
c) salicylic acid from sodium phenate and CO2
d) salicylic acid from phenol and CO2.

14. Phenol gives characteristic colouration with

a) iodine solution
b) bromine water
c) neutral FeCl₃ solution
d) ammonium hydroxide

15. Which gives iodoform test?

a) Hexan-3-one
b) Pentan-3-one
c) Pentan-2-one
d) Pentanal

16. For the reaction, H_2(g) + Br_2(g) → 2HBr_(g), the reaction rate = k[H₂] [Br₍₂₎]^1/2. Which statement is true about this reaction?

(a) The reaction is of second order.
(b) Molecularity of the reaction is 3/2.
(c) The unit of k is sec^-1.
(d) Molecularity of the reaction is 2.

17. For a reaction A + B → Products, the order w.r.t. A is 1 and w.r.t. B is 2. If concentrations of both are doubled, then rate increases by

(a) 4 times
(b) 6 times
(c) 8 times
(d) 2 times

18. Rate of a first order reaction is 1.5 x 10^-2 mol L^-1 min^-1 at 0.5 M concentration of reactant. Half-life of the reaction is

(a) 7.53 min
(b) 0.383 min
(c) 23.1 min
(d) 8.73 min

19. Arrhenius equation may not be represented as

20. Activation energy of a reaction is determined by

(a) plotting substrate – time graph
(b) plotting rate – time graph
(c) calculating rate constants at two different temperatures
(d) none of these.