Subject

Chemistry

Class

NEET Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

11.

Phenolphthalein is not suitable for the titration of :

  • NaOH vs (COOH)2

  • KOH vs H2SO4

  • K2CO3 vs HCl

  • none of the above


12.

For a gaseous reaction,

C2H4 + H2  C2H; H = -32.7 Kcal.

The concentration of C2H4 can be decreased by :

  • increasing pressure

  • increasing amount of H2

  • decreasing temperature

  • all of these


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13.

PCl5 was heated in a 10 dm3 container at 250°C

PCl5(g)  PCl3(g) + Cl2 (g)

0.1 mol PCl5 and 0.2 mol Cl2 was found at equilibrium. The equilibrium constant for the reaction is :

  • 0.025

  • 0.04

  • 0.02

  • 0.05


B.

0.04

PCl   PCl3 + Cl2

a            0        0

(a-x)      0.2      0.2(in equil)

0.1 mol  mol      mol

Hence, Kc[PCl3][Cl2][PCl5] = 0.210×0.2100.110

= 0.04


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14.

In the reaction,

H2SO4 + H2 H3O+ + HSO4-,

the conjugate acid of water is :

  • H3O+

  • H2O

  • HSO4-

  • SO42-


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15.

36 g water and 828 g ethyl alcohol form an ideal solution. The mole fraction of water in it, is :

  • 1.0

  • 0.7

  • 0.4

  • 0.1


16.

Hydrogen in respect to chlorine, is :

  • electropositive

  • electronegative

  • neutral

  • none of the above


17.

Which of the follownig elements, is most electronegative ?

  • F

  • O

  • Ne

  • Na


18.

What is obtained , when propene is treated with N-bromo succinimide ?

  • CH3-CBr=CH2

  • BrCH2-CH=CH2

  • BrCH2-CH=CHBr

  • BrCH2-CHBr-CH2Br


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19.

Poisonous gas 'Lewisite' is obtained by the reaction of :

  • CHCH and AsCl3

  • CH2=CH2 and AsCl3

  • CHCH and S2Cl2

  • CH2=CH2 and NOCl


20.

What will be the main product, when benzene vapours are passed over V2O5 at 450°C ?


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