Question # 1

If the empirical formula of compound is CH2 and its molecular mass is 56 than what is the actual molecular formula of this compound.

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CH2

C2H4

C3H6

C4H8

Which statement is true about Na and Na+

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size of Na is greater than Na+

Size of Na is smaller than Na+

Both have equal size

Both have same properties

Bohr's model of atom is contradicted b y.

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Planck quantum theory

Quantization of energy of electrons

Heisenberg's uncertainty principle

Quantization of angular momentum

NH3 shows a maximum boiling point among the hydrides of the group V elements due to.

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Very small size of nitrogen

Long pair of electrons present on nitrogen

Enhanced electronegative character of nitrogen

Pyramidal structure of NH3

In which one of the following pairs do the molecule have similar shape.

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BF3 and AlCl3

CO2 and H2O

CH4 and PH3

NH3 and BCl3

If the energy of the activated complex lies close to energy of reactants, it means that reaction is

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Slow

Fast

Exothermic

Endothermic

Cathode rays cast shadow when an opaque object is placed in their path. This behavior of cathode rays show that.

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They move is straight line

They are negatively charge

They possess momentum

They are energetic

The iodine present in water can be separated by which one of the following techniques

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Sublimation

Chromatography

Filtration

Solvent extraction

Which of the following molecules contain six bonding electrons.

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CH4

CO2

BF3

H2S

In a electrolytic cell the electrons flow from

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Cathode to anode

Anode to cathode

From cathode to anode or opposite, depending upon the nature of electrolyte

All of the above

The net change in a chemical reaction is same whether it takes place directly or indirectly is

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Henry's law

Charles's

Hess's lass

Graham's law

A buffer solution can be prepared by mixing

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Weak acid and its salt with weak base

Weak base and its salt with strong acid

Strong acid and its salts with weak base

Strong base and its salt with weak acid

The volume occupied by 1.4 g of N2 at S.T.P is

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2.24 dm3

22.4 dm3

1.12 dm3

112 cm3

One of the following liquids has lowest vapour pressure at 32°C. Indicate that liquid

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Ether

Chloroform

Ethanol

Water

Which of the given has hydrogen bonding.

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CH4

CCl4

NH3

NaCl

The Van der Waals' equation explain the behaviour of.

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Ideal gas

Real gas

Vapours

Non ideal gases

If salt bridge is not used between two half cells, than the voltage.

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Decreases rapidly

Decreases slowly

Does not change

Drops of zero

Which one of the following salts do not hydrolyses

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CuSO4

Na2CO3

NaCl

AlCl3

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