JEE Chemistry Solved Question Paper 2011 | Previous Year Papers | Zigya

Subject

Chemistry

Class

JEE Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

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1.

The radio-isotope used for treatment of thyroid disorders is

  • Na-24

  • P-32

  • Co-60

  • I-131


2.

Two glass bulbs A and B are connected by a very small tube having a stop-cock. Bulb A has a volume of 100 cm3 and contained the gas while bulb B was empty. On opening stop-clock, the pressure fell down to 40%. The volume of the bulb B must be

  • 75 cm3

  • 125 cm3

  • 150 cm3

  • 250 cm3


3.

20 mL of 0.2 M NaOH is added to 50 mL of 0.2 M acetic acid. The pH of this solution after mixing is (Ka=1.8x 10°)

  • 4.5

  • 2.3

  • 3.8

  • 4


4.

A vessel at 1000 K contains CO2 with a pressure of 0.5 atm. Some of the CO2 is converted into CO on the addition of graphite. The value of K if the total pressure at equilibrium is 0.8 atm, is

  • 1.8 atm

  • 3 atm

  • 0.3 atm

  • 0.18 atm


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5.

For the reaction 2A + B C, H = x cal, which one of the following conditions would favour the yield of C on the basis of Le-Chatelier principle?

  • High pressure, high temperature

  • Only low temperature

  • High pressure, low temperature

  • Only low pressure


6.

Heat of formation, Hf° of an explosive compound like NCl3 is

  • positive

  • Negative

  • Zero

  • Positive or Negative


7.

For the reaction,

C3H8(g) + 5O2(g)  3CO2(g) + 4H2O(l) at constant temperature,H-E is

  • RT

  • -3RT

  • 3RT

  • -RT


8.

The favourable conditions for a spontaneous reaction are

  • T S >H, H=+ve, S= +ve

  • T S >H, H=+ve, S= -ve

  • T S =H, H= -ve, S= -ve

  • T S =H, H= -ve, S= +ve


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9.

Which of the following is correct comparison of the stability of the molecules?

  • CN < O2+

  • CN = N2

  • N2 < O2

  • H2+ > He2+


10.

CH3CH2Br undergoes Wurtz reaction. We may expect some of the following product

A: CH3CH2CH2CH3

B: CH2=CH2

C: CH3-CH3

Select correct product.

  • Only A

  • A and B

  • A, B and C

  • A and C


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