A colourless crystalline salt 'x' is soluble in dilute HCl. On ad

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 Multiple Choice QuestionsMultiple Choice Questions

291.

ZXM2He4 → 15P300n1. Then

  • Z = 12, M = 27

  • Z = 13, M = 27

  • Z = 12, M = 17

  • Z = 13, M = 28


292.

Which expression has no physical significance?

  • GTp

  • GpT

  • (G)Tp

  • (G)pT


293.

Heat of neutralisation of weak acid and strong base is less than the heat of neutralisation of strong acid and strong base due to

  • energy has to be spent for the total dissociation of weak acid

  • salt of weak acid and strong base is not stable

  • incomplete dissociation of weak acid

  • incomplete neutralisation of weak acid


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294.

A colourless crystalline salt 'x' is soluble in dilute HCl. On adding NaOH solution, it gives a white precipitate which is insoluble in excess of NaOH. 'x' is

  • Al2(SO4)3

  • ZnSO4

  • MgSO4

  • SnCl2


C.

MgSO4

This salt is MgSO4. It is soluble in dilute HCl. With NaOH, it gives white precipitate of magnesium hydroxide, which is insoluble in excess of NaOH.

MgSO4 + 2HCl → MgCl2 + H2SO4

MgSO4 + 2NaOH → Mg(OH)2 ↓ + Na2SO4

Mg(OH)2 + NaOH → x (No reaction)

While other hydroxides form soluble salts, NaAlO2, Na2ZnO2 and form Na2SnO2 respectively.


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295.

The chemical equilibrium of a reversible reaction is not influenced by

  • pressure

  • catalyst

  • concentration of the reaction

  • temperature


296.

56g of nitrogen and 8g of hydrogen gas are heated in a closed vessel. At equilibrium 34 g of ammonia are present. The equilibrium number of moles of nitrogen,hydrogen and ammonia respectively are

  • 1,2,2

  • 2,2,1

  • 1,1,2

  • 2,1,2


297.

Solubility product of a salt AB is 1 × 10-8 in a solution in which concentration of A is 10-3 M. The salt will precipitate when the concentration of B becomes more than

  • 10-4 M

  • 10-7 M

  • 10-6 M

  • 10-5 M


298.

In a mixture of acetic acid and sodium acetate the ratio of concentrations of the salt to the acid is increased ten times. Then the pH of the solution

  • increases by one

  • decreases by one

  • decreases ten fold

  • increases ten fold


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299.

In a lime kiln to get higher yield of CO2, the measure that can be taken is

  • to remove

  • to add more CaCO3

  • to mamtain high temperature

  • to pump out CO2


300.

15 moles of H2 and 5.2 moles of I2 are mixed and allowed to attain equilibrium at 500°C. At equilibrium, the concentration of HI is found to be 10 moles. The equilibrium constant for the formation of HI is

  • 50

  • 15

  • 100

  • 25


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