Question # 1

²³⁸U₉₂ has number of neutrons.

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92

146

238

330

Activation energy of a chemical reaction must be....... the everage kinetic energy of reacting molecules.

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Equal to

Grether than

Lower than

None of these

All the noble gases have their valence electrons.

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Incomplete

Partialy filled

Completely filled

None of the above

Which of the following statement is not correct about isotopes.

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they have same atomic number

They have same number of protons

They have same physical properties

They have same chemical propeties

A compound with chemicla formula Na₂CX₃ has formula mass 106 ami. Atomicmass of the elemetn X is.

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16

23

12

106

Which of the following grops contain alkaline earth metals.

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I A

II A

VII A

VIII A

A good example of homogeneious mixture is.

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Soil

Ice-Creem

Rock

Wood

Whcih of the following atoms obey duplet rule.

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O₂

Cl₂

H₂

Li₂

How many electons can be accommodated in S subshell?

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2

6

14

10

The boiling point of alcohal is

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₄₄^oC

78^oC

53^oC

19^oC

Atomic number is represented by

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P

A

At

Z

Which is released in anacrobic respiration.

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Stearic acid

Citric acid

Lactic acid

Amino Acid

None polar compounds are insoluble in

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Alcohol

Benzene

Ether

Water

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