Important Questions of Hydrogen Chemistry | Zigya

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211.

The molarity of pure water is

  • 18

  • 5.56

  • 55.6

  • 100


212.

The hydration energy of Mg2+ ions is higher than that of

  • Al3+

  • Be2+

  • Na+

  • None of these


213.

A sample of gasoline contain 81% octane and 19% n-heptane. Its octane, number will be

  • 19

  • 81

  • 100

  • 62


214.

The metal X is prepared by the electrolysis of fused chloride. It reacts with hydrogen to forma colourless solid from which hydrogen is released on treatment with water. The metal is

  • Al

  • Ca

  • Cu

  • Zn


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215.

Which is the correct statement?

  • Hydrogen peroxide can oxidise permanganate ion.

  • Permanganate ion can oxidise manganous ion.

  • Manganate ion is more stable than permanganate ion.

  • Permanganate ion cannot be reduced to manganate ion


216.

Water is a

  • amphoteric acid

  • aprotic solvent

  • protophobic solvent

  • protophilic solvent


217.

Alum is a water purifier because it

  • coagulates the impurities

  • softens hard water

  • gives taste

  • destroys the pathogenic bacteria


218.

A commercial sample of hydrogen peroxide is labelled as is volume. Its percentage strength is nearly

  • 1%

  • 3%

  • 10%

  • 90%


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219.

The maximum number of hydrogen bonds that a molecule of water can have is

  • 1

  • 2

  • 3

  • 4


220.

In the reaction, 2FeSO4 + H2SO4 + H2O2 → Fe2(SO4)3 + 2H2O the oxidising agent is

  • FeSO4

  • H2SO4

  • H2O2

  • methyl cyclopentane


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