Question # 1

Which of the following pairs are chemically dissimilar?

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Na and K

Ba and Sr

Zr and Hf

Ca and Zn

The essential component of organic compound is

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O

C

P

N

Which of the substances Na, Hg, S Pt and graphic can be used as electrodes in electrolytic cells having aqueous solution?

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Na,Pt and graphite

Na and Hg

Pt and graphite only

Na and S only

Alum is not used

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As a mordant in dyeing

As an insecticide

In purification of water

In tanning of leather

Ascorbic acid is a chemical name of

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Vitamin D

Vitamin A

Vitamin C

Vitamin B₆

If a salt bridge is removed between the two half cells the voltage

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Drops to zero

Does not change

Increases gradually

Increases rapidly

Oleum is

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Castor oil

Oil of vitriol

Fuming of H₂SO₄

None of them

Bleaching action of bleaching powder is due to the liberation of

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O₂

OCI^-

CI₂

CI^-

The mass of the neutron is of the order of

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10^-23 kg

10^-24 kg

10^-26 kg

10^-27 kg

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