When NaNO3 is heated in a closed vessel oxygen is liberated

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 Multiple Choice QuestionsMultiple Choice Questions

521.

H2S gas when passed through a solution of cations containing HCl precipitates the cations of second group of qualitative analysis but not those belonging to the fourth group. It is because: 

  • presence of HCl decreases the sulphide ion concentration

  • presence of HCl increases the sulphide ion concentration

  • solubility product of group II sulphides is more than that of group IV sulphides

  • sulphides of group IV cations are unstable in HCl


522.

A + B C + D. If initially the concentration of A and B are both equal but at equilibrium, concentration of D will be twice of that of A, then what will be the equilibrium constant of reaction?

  • 4/9

  • 9/4

  • 1/9

  • 4


523.

Given pH of a solutionA is 3 and it is mixed with another solution B having pH 2. If both mixed, then resultant pH of the solution will be :

  • 3 : 2

  • 1 : 9 

  • 3 : 4

  • 3 : 5


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524.

When NaNO3 is heated in a closed vessel oxygen is liberated and NaNO3 is left behind,

At equilibrium:

  • addition of NaNO2 favours reverse reaction

  • addition of NaNO3 favours reverse reaction

  • increasing temperature favours forward reaction

  • decreasing temperature favours backward reaction


C.

increasing temperature favours forward reaction

NaNO3 (s)  NaNO2 (s) + 1 2 O2 (g)    ΔH= +veAlso Kp = (Po2)2 and thus addition of NaNO3 or NaNO2 has no effect.


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525.

CaCO3   CaO + CO2  reaction in lime kiln goes to completion because:

  • CaO does not react to CO2  to give CaCO3

  • backward reaction is very low

  • CO2 formed escapes out

  • None of the above


526.

Consider the following reversible reaction at equilibrium:

2H2O (g)  2 H2O (g) + O2 (g) ; ΔH = +24.7 KJ

The maximum decomposition of H2O(g) will occur by which of the following change in conditions.

  • Increasing temperature and decreasing pressure

  • Decrease temperature and increasing pressure

  • Increasing both temperature and pressure

  • Increasing temperature at constant pressure


527.

The pH of a 10-10M - NaOH solution is

  • 10

  • 7.01

  • 6.99

  • 4


528.

Which has minimum solubility?

  • Bi2S3

  • Ag2S

  • CoS

  • PbS


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529.

NaOH(aq), HCl(aq), and NaCl(aq) concentration of each is 10-3 M. Their pH will be respectively

  • 10, 6, 2

  • 11, 3, 7

  • 10, 3, 7

  • 10, 4, 7


530.

On adding A to the reaction at equilibrium, AB (s)  A(g) + B(g) the new equilibrium concentration of A becomes double, the equilibrium concentration of B would become:

  • 1/2 of its original value

  • 1/4 of its original value

  • 1/8 of its original value

  • Twice its original value


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