Subject

Chemistry

Class

NEET Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

11.

The total number of atomic orbitals in fourth energy level of an atom is 

  • 16

  • 32

  • 4

  • 8

854 Views

12.

By what factor does the average velocity of a gaseous molecule increase when the temperature (in kelvin) is doubled?

  • 2.8

  • 4.0

  • 1.4

  • 1.4

644 Views

13.

In Duma's method of estimation of nitrogen 0.35 g of an organic compound gave 55 mL of nitrogen collected at 300 K temperature and 715 mm pressure. The percentage composition of nitrogen in the compound would be

(Aqueous tension at 300 k = 15 mm)

  • 16.45

  • 17.45

  • 14.45

  • 14.45

429 Views

14.

Mole fraction of the solute in a 1.00 molal aqueous solution is 

  • 0.0177

  • 0.0344

  • 1.7700

  • 1.7700

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15.

The value of ΔH for the reaction

X2 (g) + 4Y2 (g) ⇌ 2XY4 (g) is less than zero. Formation of XY4 (g) will be favoured at

  • Low pressure and low temperature

  • high temperature and low pressure

  • high pressure and low temperature

  • high pressure and low temperature

430 Views

16.

For the reaction N2 (g) + O2 (g) ⇌  2NO (g), the equilibrium constant is K1. The equilibrium constant is K2 for the reaction 2NO (g) + O2(g) ⇌ 2NO2 (g). What is K for the reaction NO subscript 2 space left parenthesis straight g right parenthesis space rightwards harpoon over leftwards harpoon 1 half straight N subscript 2 space left parenthesis straight g right parenthesis space plus straight O subscript 2 space left parenthesis straight g right parenthesis ? space space

  • 1/(4K1K2)

  • [1/K1K2]1/2

  • 1/(K1K2)

  • 1/(K1K2)

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17.

The energies E1 and E2 of two radiations are 25 eV respectively. The relation between their wavelength i.e., λ1 and λ2 will be

  • λ1 = 2λ2

  • λ1 = 4λ2

  • λ1 = λ2/2

  • λ1 = λ2/2


A.

λ1 = 2λ2

E1 = 25eV. E2 = 50 eV

E1 = hc/λ1  and E2 = hc/λ2


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18.

Which of the following has the minimum bond length?

  • O2-

  • O22-

  • O2

  • O2

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19.

Which one of the following statements is not true?

  • Concentration of DO below 6 ppm is good for the growth of fish

  • Clean water would have a BOD value of less than 5 ppm

  • Oxides of sulphur, nitrogen and carbon are the most widespread air pollutant

  • Oxides of sulphur, nitrogen and carbon are the most widespread air pollutant

414 Views

20.

If n =6, the correct sequence for filling of electrons will be

  • ns → (n-1) d → ( n - 2)f → np

  • ns - (n-2)f → np → (n-1)d

  • ns - np → (n-1)d → (n-2)f

  • ns - np → (n-1)d → (n-2)f

554 Views

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