Question # 1

Nelson's cells used to prepare caustic soda along with gases. Which of the following gas is produced at cathode?

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CI₂

H₂

O₃

O₂

Which one is not a property of electrolytic cell?

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It consists of one complete cell

Anode has +ve charge

It converts electrical energy into chemical one

Anode has -ve charge

Which one of the following halogen has lowest electronegative?

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fluorine

chlorine

bromine

iodine

The smallest under of an ionic compound is

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Atom

Formula unit

Ion

Molecule

It is an ionic compound

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H2O

NaCI

CH4

HF

________________ is triangular in shape.

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BCL3

H2O

CO2

NH3

Which one is an example of colloids?

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NaCl + Solution

Milk

Fog

Air

Electron _____________ energy when thy jump from higher to lower level.

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Absorb

Radiate

Nothing

Nil

All ionic compound are ________________ at room temperature.

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Liquid

Solids

Gas

Plasma

The lowest energy level is

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K

L

M

N

The earth is made up of ___________ % of calcium.

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4

5

6

7

The oxidation number of chromium in K₂Cr₂O₇ is:

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+2

+6

+7

+14

Along the period which one of the following decrease:

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Atomic radius

ionization energy

electron affinity

electronegative

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