Important Questions of Equilibrium Chemistry | Zigya

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611.

Hydrofluoric acid is a weak acid. At 25°C, the molar conductivity of 0.002 M HF is 176.2 Ω-1cm2 mol-1. If its °m = 405.2 Ω-1 cm2 mol-1. Equilibrium constant at the given concentration is

  • 6.7 × 10-4 M

  • 3.2 × 10-4 M

  • 6.7 × 10-5 M

  • 3.2 × 10-5 M


612.

A buffer solution contains 500 mL of 0.2 M CH3COONa and 500 ml of 0.1 M CH3COOH .1 L of water is added to this buffer , pH before and after dilution will be (pka of CH3COOH = 4.74)

  • 3.74

  • 5.04

  • 5.90

  • 7.70


613.

Assertion : Heat of neutralisation of nitric acid with NaOH is same to that of HCI and NaOH.

Reason : In both cases strong acid and strong bases are neutralised.

H+ + OHH2O

  • If both assertion and reason are true and reason is the correct explanation of assertion

  • If both assertion and reason are true but reason is not the correct explanation of assertion

  • If assertion is true but reason is false

  • If both assertion and reason are false.


614.

The conjugate base of (CH3)2NH2+ is :

  • (CH3)3N

  • (CH3)2NH

  • (CH3)2N-

  • (CH3)2N+


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615.

Assertion : Ice  water, if pressure is applied water will evaporate.

Reason : Increases of pressure pushes the equilibrium towards the side in which number of gaseous molecule increases.

  • If both assertion and reason are true and reason is the correct explanation of assertion

  • If both assertion and reason are true but reason is not the correct explanation of assertion

  • If assertion is true but reason is false

  • If both assertion and reason are false


616.

Assertion : In an acid-base titration involving strong base and a weak acid, methyl orange can be used as an indicator.

Reason : Methyl orange changes its colour in pH range of 7 to 9.

  • If both assertion and reason are true and reason is the correct explanation of assertion

  • If both assertion and reason are true but reason is not the correct explanation of assertion

  • If assertion is true but reason is false

  • If both assertion and reason are false


617.

The Ksp of Mg(OH)2 is 1 x 10-12 , 0.01 M Mg(OH)2 will precipitate at the limited pH :

  • 3

  • 9

  • 5

  • 8


618.

NH4COONH2 (s)  2NH3 (g) + CO2 (g) ,if equlibrium pressure is 3 atm for the above reaction .Kp for the reaction is :

  • 4

  • 27

  • 4/27

  • 1/27


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619.

The pH of the solution obtained on neutralisation of 40 mL 0.1 M NaOH with 40 mL 0.1 M CH3COOH is

  • 7

  • 8

  • 6

  • 3


620.

In P versus V graph, the horizontal line is found in which exists

  • Gas

  • Liquid

  • Equilibrium between gas and liquid

  • Super critical temperature


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