Question # 1

How many covalent bond does C₂H₂ molecule have?

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two

three

four

five

The 2nd and third periods are called

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short period

Normal period

Long period

Very long period

CO2 the oxidation number of C =.

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+1

+2

+3

+4

Which molecule has single covalent bond?

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O₂

N₂

CI₂

CO₂

Which one is least reactive non-metal?

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P

C

CI

F

Mixture has _________ types.

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3

2

1

No types

In silver plating Anode is made of:

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Gold

Ag

Neon

Nil

The period of Alchemists extends from _________ AD.

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800 to 1800

600 to 1600

900 to 1900

700 to 1700

The no. of electrons in the valence shell of alkali metals is

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1

2

4

7

Identify when pair has polar covalent bonds:

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O₂ and Cl₂

H₂O and N₂

H₂O and C₂H₂

H₂O and HCI

..................... is property of metals.

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Gases

Lustrous

Solids

Nil

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

The lowest energy level is

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K

L

M

N

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