JEE Chemistry Solved Question Paper 2015 | Previous Year Papers | Zigya

Subject

Chemistry

Class

JEE Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

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1.

n/p ratio during positron decay

  • increases

  • decreases

  • remains constant

  • All of these


2.

What is the free energy change G when 10 moles of water at 100°C and 1 atm pressure is converted into steam at 100° C and 1 atm pressure?

  • 540 cal

  • -9800 cal

  • 9800 cal

  • 0 cal


3.

Among the following groupings which represent the collection of isoelectronic species.

  • NO+, C22-, C2-, CO

  • N2, C22-, CO, NO

  • CO, NO+, CN-, C22-

  • NO, CN-, N2, O2-


4.

Which element has maximum first ionisation potential?

  • Cs

  • F

  • Na

  • He


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5.

In which of the following E = H?

  • N2O4 (g)  2NO2 (g)

  • 2SO2 (g) + O2 (g)  2SO3 (g)

  • H2 (g) + I2 (g)  2HI (g)

  • H2 (g) + 12 O2 (g) H2O (l)


6.

The empirical formula of a compound is CH2. One mole of this compound has a mass 42g. Its molecular formula is

  • C3H6

  • C2H6

  • CH2

  • C2H2


7.

Which of the following notations shows the product incorrectly?

  • B510 (α, n) N713

  • Cm96242 (α, 2n) Bk97243

  • N714 (n, p) C614

  • Si1428 (d, y) P1530


8.

Atomic radii of which metals are same?

  • Cr, Mn, Cu

  • Cr, Fe, Co

  • Sc, Ti, Zn

  • V, N, Cr


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9.

If Kc is the equilibrium constant for the formation of NH3, the dissociation constant of NH3 under the same condition will be

  • 1Kc

  • KC2

  • KC

  • KC


10.

The pH of a soft drink is 3.92. The hydrogen ion concentration will be

( given antilog 0.08 = 1.2)

  • 1.96 × 10-2 mol L-1

  • 1.96 × 10-3 mol L-1

  • 1.2 × 10-4 mol L-1

  • 1.2 × 10-3 mol L-1


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