Subject

Chemistry

Class

NEET Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

1.

Which of the following salt does not get hydrolysed in water ?

  • KClO4

  • NH4Cl

  • CH3COONa

  • None of these


A.

KClO4

Only salts of (weak acid + strong base) and (strong acid + weak base) get hydrolysed (i.e., show alkalinity or acidity in water) . KClOis a salt of strong acid and strong base ,therefore it does not get hydrolysed in water .

KClO4  K+ + ClO4-

H2 OH-(strong)KOH  +  H+HClO4(strong)


2.

KI and CuSO4 solution when mixed , give :

  • CuI2 + K2SO4

  • Cu2I2 + K2SO4

  • K2SO+ Cu2I2 + I2

  • K2SO+ CuI2 + I2


C.

K2SO+ Cu2I2 + I2

2KI + CuSO4  CuI2unstable + K2SO4

2CuI2  Cu2I2 + I2

Hence , solution contains K2SO+ Cu2I2 + I2


3.

Which among the following elements have lowest value of IE1 ?

  • Pb

  • Sn

  • Si

  • C


B.

Sn

The ionisation energy of Tin (Sn) is less than that of lead (Pb) .It is due to the poor sheilding of d - and f - electron in Pb due to which it feels greater attraction from nucleus .


4.

Which of the following element is a metalloid ?

  • Bi

  • Sn

  • Ge

  • C


C.

Ge

Boron (B) , Si , Ge , As , Sb , Te and At are the metalloid elements .Bismuth (Bi) and tin (Sn) are metals while carbon (C) is non-metal .


5.

What will be the pH value of 0.05 M Ba(OH)2 solution ?

  • 12

  • 13

  • 1

  • 12.96


B.

13

0.05 M Ba(OH)2 Solution

= 2 x 0.05 N Ba(OH)2

= 0.10 N Ba(OH)2

 pOH = -log [OH-]

= - log (0.10) = 1

pH = 14 - pOH

= 14 - 1 = 13


6.

In the reaction :

H2 + I2  2HI

In a 2 litre flask 0.4 moles of each H2 and I2 are taken .At equilibrium 0.5 moles of HI are formed .What will be the value of equilibrium constant ,Kc ?

  • 20.2

  • 25.4

  • 0.284

  • 11.11


D.

11.11

Kc[HI]2[H2][I2] 0.50220.1520.152

0.5 × 0.50.15 × 0.15 = 11.11

  H2 + I2 2HI
  0.4   0.4   0.50
At equilibrium 0.4- 0.25   0.4 - 0.25   0.50
  = 0.15   = 0.15    

7.

Which of the following elements never show positive oxidation number ?

  • O

  • Fe

  • Ga

  • F


D.

F

Fluorine is the most electronegative element in the periodic table so it never shows positive oxidation state .


8.

Ionisation depends upon :

  • pressure

  • volume

  • dilution

  • none of these


C.

dilution

Ionisation depends upon concentration , temperature , nature of solute and on nature of solvent .Ionisation increases on increasing dilution .


9.

The first ionisation potential is maximum for :

  • B

  • N

  • O

  • Be


B.

N

Ionisation potential generally increase when we move in a period from left to right but IE1 of N2 is greater than that of O2 .It is due to the more stable (half-filled orbitals) configurations of N .


10.

The solubility of in water is Sb2S3 in water is 1.0 x 10-5 mol/litre at 298 K .What will be its solubility product ?

  • 108 x 10-25

  • 1.0 x 10-25

  • 144 x 10-25

  • 126 x 10-25


A.

108 x 10-25

Sb2S3s mol/lit  2Sb3+2s + 3S2-3s

Solubility product

(Ksp) = [Sb3+]2 [S2]3

= (2s)2 (3s)3

= 108 s5

= 109 x (1.0 x 10-5)5

= 108 x 10-25