Question # 1

Safe and reliable method of drying crystals is through.

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Pressing it between folds of filter paper

Drying it in oven

Evaporation of solution

Vacuum desiccator

What is bond order.

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Number of unpaired electrons

Number of paired electrons

Number of electrons present in antibonding molecular orbital

Number of bond formed between two atoms after overlap

Which gas has highest e/m ratio

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Hydrogen

Helium

Nitrogen

Oxygen

Which has zero potential energy.

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When H atom is independent

When two H atoms combine to form H2 molecule

When two H atoms super impose to each other

When two H atoms have weak attraction between them

Half -Life for a given reaction is doubled if initial concentration is doubled. The order of reaction is.

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0

1

2

3

The pressure of oxygen inside the bomb calorimeter is.

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100 atm

50 atm

25 atm

20 atm

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

Vapour pressure of a substance does not depend upon.

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Temperature

Intermolecular forces

Surface area

Physical state of water

The electron in a subshell is filled according to formula.

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2n²

2(2l+1)

(2l+1)

None of these

The highest temperature above which a gas cannot be liquified, no matter how much the pressure is applied is known as

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Boiling temperature

Consulate temperature

Absolute zero

Critical temperature

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

Which is not used as drying agent in a desiccator.

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Cacl2

NaCl

P2O5

Salica Gel

Half -Life period of a first order reacting is independent of.

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Initial concentration of the compound

Conditions of temperature

Presence of catalyst

All the above

Select the correct answer out of the following alternative suggestions London dispersion forces are the only forces present among the.

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Molecules of water in liquid state

Atoms of helium is gaseous state at high temperature.

Molecules of solid I2

Molecule of H-Cl gas

If four moles of sulphur dioxide are oxidized to sulphur trioxide, how many moles of oxygen are needed.

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0.5

1.0

1.5

2.0

When a reaction occurs in many steps than the slowest step is.

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Mechanism step

Rate determining step

enthalpy determining step

None of the above

On which factor boiling point of a liquid depends.

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Amount of the liquid

Shape of the container of the liquid

Type of burner used for boiling

External pressure

As compared to pure atomic orbitals the hybrid orbitals have.

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Low energy

High energy

Same energy

None of these

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