JEE Chemistry Solved Question Paper 2013 | Previous Year Papers | Zigya

Subject

Chemistry

Class

JEE Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

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1.

At 25°C, the solubility product of salt of MX2 type is 3.2 × 10-8 in water. The solubility (in mol/L) of MX2 in water at the same temperature will be

  • 1.2 × 10-3

  • 2 × 10-3

  • 3.2 × 10-3

  • 1.75 × 10-3


2.

In SOCl2, the Cl-S-Cl and Cl-S O bond angles are

  • 130° and 115°

  • 106° and 96°

  • 107° and 108°

  • 96° and 106°


3.

In O2 and H2O2 , the O-O bond lengths are 1.21 and 1.48 Å respectively. In ozone, the average O-O bond length is

  • 1.28 Å

  • 1.18 Å

  • 1.44 Å

  • 1.52 Å


4.

The different colours of litmus in acidic, neutral and basic solutions are, respectively.

  • red, orange and blue

  • blue, violet and red

  • red, colourless and blue

  • red, violet and blue


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5.

The correct order of equivalent conductances at infinite dilution in water at room temperature for H+, K+, CH3COO- and HO- ions is

  • HO- > H+ > K+ > CH3COO-

  • H+ > HO- > K+ > CH3COO-

  • H+ > K+ > HO- > CH3COO-

  • H+ > K+ > CH3COO- > HO-


6.

The change of entropy (dS) is defined as

  • dS = δqT

  • dHT

  • dS = δqrevT

  • dS = dH - dGT


7.

For a chemical reaction at 27°C, the activation energy is 600 R. The ratio of the rate constants at 327°C to that of at 27°C will be

  • 2

  • 40

  • e

  • e2


8.

A van der Waals' gas may behave ideally when

  • the volume is very low

  • the temperature is very high

  • the pressure is very low

  • the temperature, pressure and volume all are very high


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9.

In diborane, the number of electrons that accounts for bonding in the bridges is

  • six

  • two

  • eight

  • four


10.

At 25°C, pH of a 10-8 M aqueous KOH solution will be

  • 6.0

  • 7.02

  • 8.02

  • 9.02


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