Question # 1

The number of electrons in K shell of O is ________________

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9

10

2

1

Which element has highest electronegativity?

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CI

F

Br

I

The branch of chemistry which deals with inter conversion of electrical & chemical energy is:

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Biochemistry

Electrochemistry

Organic chemistry

None of these

All metals are solid except

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AI

Mg

Na

Hg

The cathode of Nelson's cell is made up of

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C

Zn

Cu

Fe

10 gram sugar is dissolved in 90 gram of water to make a 100 gram solution.This solution is

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10% m/m

10% m/v

10% v/m

10% v/v

In a discharge tube, the pressure of a gas is kept at

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10-2 atm

10-4 atm

10-6 atm

10-8 atm

Concentration is ratio of:

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solvent to solute

solute to solution

solvent to solution

both a and b

biology bis classified as ___________ science.

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Engineering

Physical

Natural

Chemical

The value of Planck's constant is

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6.63 x 10-34 Js

6.63 x 10-32 Js

6.63 x 10-30 Js

6.63 x 10-28 Js

The isotopes C-12 is present in abundance of:

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96.6%

97.6%

99.7%

None of these

In the redox reaction between zn and HCI. the oxidizing agent is:

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zn

H⁺

C

H²

Oxygen is ___________

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Metals

Non-metals

Gas

b & c

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