5 millimoles of caustic potash and 5 millimoles of oxalic acid ar

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 Multiple Choice QuestionsMultiple Choice Questions

271.

For the reaction, 2NO(g) + Cl2(g) 2NOCl(g). which relation is true ?

  • KP=Kc × RT

  • KP= KcRT

  • KP= Kc(RT)2

  • KP= KcRT2


272.

If the molar solubility of X3B3(AlF6)2 at 298 K is x, the solubility product Ksp is

  • 18x3

  • 27x4

  • 27x8

  • 2916x8


273.

The pH of 0.05 M solution of a strong dibasic acid is

  • 0.0

  • 1.0

  • 0.2

  • 0.5


274.

For the equilibrium reaction,

2SO2 (g) + O2 (g)  2SO3 (g) + H

the increase in temperature

  • favours the formation of SO3

  • favours the decomposition of SO3

  • does not affect the equilibrium

  • stops the reaction


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275.

5 millimoles of caustic potash and 5 millimoles of oxalic acid are mixed and dissolved in 100 mL water. The solution will be

  • basic

  • acidic

  • neutral

  • cannot say


B.

acidic

The equation for the reaction of oxalic acid with a solution of caustic potash.

2KOH (aq) + H2C2O4.2H2O (aq) K2C2O4 (aq) + 4H2O

Molarity equation, M1V1n1 = M2V2n2

where, M1 = molarity of acid = 5 millimol

M2 = molarity of base = 5 millimol

V1 = volome of acid = 100 mL

V2 = volume of base = 100 mL

n1 = stoichiometric coeffecient of acid = 1

n2 = stoichiometric coeffecient of base = 2

As it is clear from balanced equation that 2 moles of KOH are required to neutralize one mole of oxalic acid. Thus, the solution formed by 5 millimoles of KOH and 5 millimoles of oxalic acid mixed and dissolved in 100 mL water will be acidic.


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276.

Which solution is a buffer?

  • Acetic acid + NaOH (equimolar ratio)

  • Acetic acid + NaOH (1 : 2 molar ratio)

  • Acetic acid + NaOH (2 : 1 molar ratio)

  • HCl + NaOH (equimolar ratio)


277.

The solubility of Al(OH)3 is 'S' mol L-1. The solubility product will be

  • S2

  • S3

  • 27 S4

  • 27 S3


278.

If in the reaction N2O4 2NO2α is the degree of dissociation of N2O4 then total number of moles at equilibrium is

  • (1-α)

  • (1+α)

  • (1-α)2

  • (1+α)2


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279.

KpKc for the reaction

CO (g) + 12 O2 (g)  CO2 (g) is

  • RT

  • 1RT

  • RT

  • 1RT


280.

In the equilibrium mixture, KI+ I2 KI3 the concentration of KI and I2 and three fold respectively . The concentration of KI3 becomes

  • two fold

  • three fold

  • five fold

  • six fold


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