Question # 1

Sodium is exterminate reactive metal, but it does not react with:

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Hydrogen

Nitrogen

Sulphur

Phosphorus

________________ cannot be seen by naked eye.

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Matter

Molecules

Solid

Liquids

Oxidation means

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Gain of oxygen

Removal of oxygen

Gain of hydrogen

Gain of electrons

The bound between ionic compound is ............ .

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Covalent

Co-ordinate

Ionic

Nil

Which of the following does not affect solubility?

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Temperature

Pressure

Nature OF SOLVENT

Area

Group runs from ________________

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Top to bottom

Left to right

Top to right

Bottom to left

The empirical formula of glucose is

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CHO

CH2O

C2HO

CHO2

At freezing point which one of the following coexists in dynamic equilibrium?

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gas and solid

liquid and gas

liquid and solid

all of these

The equation of relationship between atomic number (Z) and mass number (A) is

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A = Z + N

A = Z - n

A = Z

A =2Z + n

The value of Avogadro 'no is:

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6.023×1024

6.023×1026

6.023×1023

6.023×1020

When temperature of water drops to ____________ °C it convert onto ice.

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0

-2

-1

1

The periodic table consist of ________________ columns.

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Periods

Rows

Column

Nil

The absolute zero means:

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273.15 °C

-273.15 °C

0 °C

-373.15 °C

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