Question # 1

In which molecule all atoms are coplanar.

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CH4

BF3

NH3

PH3

Which one of the following substances is used as water absorber in combustion analysis.

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Mg(CIO4)2

50% KOH

Lime water

Dilute solution of NaOH

When an atom reacts chemically and loses one or more electrons it is.

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Decomposed

Reduced

Oxidized

Catalyzed

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

Which one of the following process is endothermic

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condensation of steam

Freezing of water

electrolysis of water

None of these

The born Haber cycle is the best application of law.

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Boyle's

Dalton's

Hess's

Graham's

Cadmium has isotopes.

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3

4

5

9

In order to have good crystals of a substance the temperature of the system at the time of preparation of solution should be

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Around 0°C

Around room temperature

Sufficiently more than room temperature

Just above the room temperature

Which of the given has hydrogen bonding.

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CH4

CCl4

NH3

NaCl

The unit of rate constant is same as that of rate of reaction in

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first order reaction

Second order reaction

Third order reaction

Zero order reaction

Half life period for 235 U is

92

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710 million years

810 milion years

720 million years

820 million years

The tendency of an tom to attract shared pair of electron towards itself is called its.

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Ionization energy

Electronegativity

Electron affinity

dipole moment

In order to mention the B.P of water at 110 ^oC the external pressure should be.

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Between 760 torr and 1200 torr

Between 200 torr and 760 torr

765 torr

Any value of pressure

How many sigma and pi bonds are present in C2H2.

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one sigma and two pi

two pi and one sigma

Two pi and three sigma

Three pi and two sigma

The effect of temperature on equilibrium was studied by

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Lewis

Van der wall

Arrhenius

Vant hoff

Azeotrpic mixture of two liquids boils at a lower temperature than either of them, when

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It is saturated

Is shows positive deviation from Raoult's law

It shows negative deviation from Raoult's law

Is is metastable

The shape of H₃O is

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Tetrahedral

Angular

Trigonal planer

Pyramidaj

The volume occupied by 1.6 g of O₂at STP is

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22.4 dm³

2.24 dm³

1.12 dm³

112 dm³

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