The number and type of bonds between two carbon atoms in calcium

Subject

Chemistry

Class

JEE Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

1.

Which one of the following species is diamagnetic in nature?

  • He2+

  • H2

  • H2+

  • H2+

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2.

For a spontaneous reaction the ∆G, equilibrium constant (K) and Eocell will be respectively 

  • -ve, >1, +ve

  • +ve, >1, -ve

  • -ve, <1, -ve

  • -ve, <1, -ve

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3.

Consider the reaction: N2 +3H2 → 2NH3 carried out at constant temperature and pressure. If ∆H and ∆U are the enthalpy and internal energy changes for the reaction, which of the following expressions is true? 

  • ∆H = 0

  • ∆H = ∆U

  • ∆H < ∆U

  • ∆H < ∆U

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4.

Which one of the following statements is NOT true about the effect of an increase in temperature on the distribution of molecular speeds in a gas?

  • The most probable speed increases

  • The fraction of the molecules with the most probable speed increases

  • The distribution becomes broader

  • The distribution becomes broader

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5.

The exothermic formation of ClF3 is represented by the equation

Cl subscript 2 left parenthesis straight g right parenthesis space plus space 3 straight F subscript 2 space left parenthesis straight g right parenthesis space rightwards harpoon over leftwards harpoon with space space space space space space space on top space 2 ClF subscript 3 space left parenthesis straight g right parenthesis space semicolon space increment rH space equals negative 329 space kJ
Which of the following will increase the quantity of ClF3 in an equilibrium mixture of Cl2, F2 and ClF3?

  • Increasing the temperature

  • Removing Cl2

  • Increasing the volume of the container

  • Increasing the volume of the container

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6.

For the reaction

2 NO subscript 2 space left parenthesis straight g right parenthesis space rightwards harpoon over leftwards harpoon with space space space space space on top space 2 NO subscript space left parenthesis straight g right parenthesis end subscript space plus space straight O subscript 2 left parenthesis straight g right parenthesis
left parenthesis straight K subscript straight c space equals 1.8 space straight x space 10 to the power of negative 6 end exponent space at space 184 to the power of straight o space straight C right parenthesis
left parenthesis straight R space equals space 0.0831 space kJ divided by left parenthesis mol. straight K right parenthesis

When Kp and Kc are compared at 184oC, it is found that

  • Kp is greater than Kc

  • Kp is less than Kc

  • Kp = Kc

  • Kp = Kc

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7.

Hydrogen ion concentration in mol / L in a solution of pH = 5.4 will be

  • 3.98 x 108

  • 3.88 x 106

  • 3.68 x 10-6

  • 3.68 x 10-6

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8.

If we consider that 1/6 in place of 1/12 mass of carbon atom is taken to be the relative atomic mass unit, the mass of one mole of a substance will 

  • Decrease twice

  • Increase two fold

  • Remain unchanged

  • Remain unchanged

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9.

In a multi-electron atom, which of the following orbitals described by the three quantum numbers will have the same energy in the absence of magnetic acid and electric fields?

(a) n = 1, l = 0, m = 0
(b) n = 2, l = 0, m = 0
(c) n = 2, l = 1, m = 1
(d) n = 3, l = 2, m = 1
(e) n = 3, l = 2, m = 0

  • (a) and (b)

  • (b) and (c)

  • (c) and (d)

  • (c) and (d)

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10.

The number and type of bonds between two carbon atoms in calcium carbide are

  • One sigma, one pi

  •  One sigma, two pi

  • Two sigma, one pi

  • Two sigma, one pi


B.

 One sigma, two pi



σ =One π =Two  
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