NEET TEST SERIES 149 CHEMISTRY

1. At 25°C and 730 mm pressure, 380 ml of dry oxygen was collected. If the temperature is constant, what volume will the oxygen occupy at 760 mm pressure?

(a) 365 ml
(b) 2 ml
(c) 10 ml
(d) 20 ml

2. Predict the product C obtained in the following reaction of 1-butyne

3.

Which of the above compound(s), on being warmed with iodine solution and NaOH, will give iodoform?

(a) (i), (iii) and (iv)
(b) Only (ii)
(c) (i), (ii) and (i)
(d) (1) and (ii)

4. Consider the following statements.
(1) XeF₄  is colourless crystalline solid and undergoes sub-limation.
(2) XeOF₂ is colourless volatile liquid.
(3) XeO₃ is colourless explosive solid.
The correct statements are:

(a) (1) and (2) only
(b) (2) and (3) only
(c) (1) and (3) only
(d) (1), (2) and (3)

5. A solution has 1: 4 mole ratio of pentane to hexane. The vapour pressure of the pure hydrocarbons at 20°C are 440 mm of Hg for pentane and 120 mm of Hg for hexane. The mole fraction of pentane in the vapour phase would be:

(a) 0.549
(b) 0.200
(c) 0.786
(d) 0.478

6. One mole of Al³⁺ discharged completely by using charge?

(a) 3Fmole of Al³⁺ 
(b) IF
(c) 0.3F
(d) 2F

7. In which of the following molecules/ions BF₃ NO^–₂, NH^–₂and H₂O, the central atom is sp” hybridised?

8. Which one of the following is a free-radical substitution reaction?

9.

(a) CH₂ CH₂ O-CH₂-CH₃
(b) CH₂-CH₂-O-SO₃ H
(c) CH₃ CH₂ OH
(d) CH₂=CH₂

10. Which of the following is an ideal solution?

(a) Ethanol + water
(b) Ethanol + benzene
(c) Nitric acid + water
(d) Benzene + toluene

11. The efficiency of a fuel cell is given by:

12. Which of the following will not show cis-trans isomerism ?

13. Among the following compuands, one that is most reactive towards electrophilic nitration is

(a) benzoic acid.
(b) nitrobenzene
(c) toluene.
(d) benzene.

14. At 25°C ,the dissociation constant of a base, BOH is 1.0× 10^-12. The concentration of hydroxyl ions in 0.01 M aqueous solution of the base would be:

(a) 2.0× 10^-6  molL^-1
(b) 1.0× 10^-5  molL^-1
(c) 1.0× 10^-6  molL^-1
(d) 1.0× 10^-7  molL^-1

15. If the enthalpy change for transition of liquid water to steam is 30 kJ mol^-1 at 27 °C The entropy change for the process would be:

(a) 1.0 J mol^-1  K^-1       
(b) 0.1 J mol^-1  K^-1 
(c) 100 J mol^-1  K^-1

(d) 10 J mol^-1  K^-1

16. In which electrophilic substitution reaction slow step is breaking of C-H bond?

(a) Sulphonation of benzene
(b) Nitration of benzene
(c) Chlorination of benzene
(d) All of these

17. Acetone and ethanol can be chemically distinguished by:

(a) I₂/NaOH
(b) 2, 4 DNP
(c) Tollen’s reagent
(d) Both (a) and (b)

18. In which of the following reaction C-C bond formation does not take place?

(a) Gattermann-Koch reaction
(b) Étard reaction
(c) Benzoin condensation
(d) Swarts reaction

19. The value of H and S for the reaction,
C _(graphite) (s) + CO₂(g) → 2CO(g) are 170 kj and 170 JK^-1 ,respectively. This reaction will be spontaneous at:

(a) 710 K
(b) 910 K
(c) 1110 K
(d) 510 K

20. The experimental data for the reaction 2A + B₂→2AB is:

The rate equation for the above data is:

(a) rate = k[B₂]
(b) rate = k[B₂]²
(c) rate = k[A]² [B]²
(d) rate = k[A]² [B]