Sodium nitrate on reduction with Zn in presence of NaOH solution

Subject

Chemistry

Class

NEET Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

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1.

Sodium nitrate on reduction with Zn in presence of NaOH solution produces NH3. Mass of sodium nitrate absorbing 1 mole of electron will be

  • 7.750

  • 10.625

  • 8.000

  • 9.875


B.

10.625

In the equation,

Zn + 2OH- → ZnO22- + 2H+ + 2e-

NO3- + 8H+ + 8e- → OH- + 2H2O + NH3

Now, from the equation, we get

8 moles of electron absorbed by 85 gm of NaNO3.

 1 mole of electron absorbed by 858g of NaNO3 = 10.625 gm


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2.

In transforming 0.01 mole of PbS to PbSO4, the volume of '10 volume' H2O2 required will be

  • 11.2 mL

  • 22.4 mL

  • 33.6 mL

  • 44.8 mL


3.

An unknown element forms an oxide.What will be the equivalent weight of the element if the oxygen content is 20% by weight?

  • 16

  • 32

  • 8

  • 64


4.

2 N HCl solution will have same molar concentration as a

  • 4.0 N H2SO4

  • 0.5 N H2SO4

  • 1 N H2SO4

  • 2 N H2SO4


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5.

Addition of sodium acetate to 0.1 M acetic acid will cause

  • increase in pH

  • decrease in pH

  • no change in pH

  • change in pH that cannot be predicted


6.

The electronic configuration 1s2, 2s22p6, 3s23p63d9 represents a

  • metal atom

  • non metal atom

  • non-metallic anion

  • metallic cation


7.

Unusually high boiling point of water is result of

  • intermolecular hydrogen bonding

  • intramolecular hydrogen bonding

  • both intra and inter molecular hydrogen bonding

  • high specific heat


8.

In a given shell the order of screening effect is

  • s > p > d > f

  • s > p > f > d

  • f > d > p > s

  • s < p < d < f


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9.

A catalyst is a substance which

  • increases the equilibrium constant of the reaction

  • increases equilibrium concentration of products

  • does not alter the reaction mechanism

  • changes the activation energy of the reaction


10.

Which of the following expressions gives the de-Broglie relationship?

  • p=hmv

  • λ=hmv

  • λ=hmp

  • λm=vp


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