Question # 1

The enthalpy of reaction 2H2 +O2-----2H2O

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-571.6 kJ

-110.5 kJ

-393.5 kJ

+53.8 kJ

If the Delta H value is negative then reaction witll be

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Endotermic

Exothermic

May or may not be exothermic or endothermic

None of these

A base is a substance which neutralizes an acid. Which of these substances is not aa base.

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Aqueious ammonia

Calcium oxide

sodium Chloride

Sodium carbonate

How many blocks are presnt in modern periodic table

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2

3

4

5

Main group elements are arranged in ..............groups.

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7

6

8

10

When new bonds ae formed, the energy is

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Consume

Remain same

Release

None of these

How many number of moles are equivalent to 8 gram of CO2.

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0.18

0.15

0.24

0.21

Which of the following is an exampel of polar covalent compound.

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Cl2

H2

O2

HCl

--------------- acts a catalyst promoting the breakdown of ozone.

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I2

Br2

Cl2

None

Building block of all matter is.

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element

Compound

Mixture

Atom

Number of protons in the nucleus of an atom is called.

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Atomic number

Mass Number

Mass Unit

Electron Number

-------------acts are reserve energy sources.

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Enzymes

Vitamins

Proteins

Lipids

Which isotope is used in nuclear reactors.

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U-234

U-235

U-238

All of these

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