Question # 1

Chlorine atom and chloride Cl- ions

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Have same chemical and physical properties

Are allotropes of chlorine

Have same number of electrons

Have same number of proton

The mass of alpha particle is equal to.

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Four times the mass of one proton

That of one hydrogen atom

That of one electron

That of one proton

Standard hydrogen electrode has an arbitrarily fixed potential

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0.00 volts

1.00 volt

0.10 volt

None of these

A type of meals are usually used as catalyst.

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Coinage metal

Alkali metals

Transition metals

alkaline earth metals

The distillation of liquid under reduced pressure is called.

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Destructive distillation

Vaccum distillation

Simple distillation

Fractional distillation

Which molecules is 100% covalent

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H2

H2O

HF

NH3

The wave number of the light emitted by a certain source is 2 x 10⁶m. the wavelength of this light is

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500 nm

500 m

200 nm

5 x 10⁷m

Gases exert pressure on the walls of the container becasue the gas molecules.

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Collide with each other

Collide with walls of container

Have definite volume

Obey the gas laws

Velocity constant is the rate of reaction when the concentrations of reactants are

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Zero

Unity

Two

Three

When 5d orbital is completed them entering electron goes into.

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6s

6p

6d

6f

To achieve a good separation, the two liquids are gently shaken to increase their area of.

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Miscibility

Separation

contact

Solubility

Which one of the following statements is incorrect.

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Enzymes are protein in nature

Enzymes are catalyst

Enzymes can catalyze any reaction

Urease is an enzyme

One of the following statements about Born-Haber cycle is correct. Which is that statement

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Born-Haber cycle is different from Hess's law

The energy change in a cyclic process is not zero

The lattice energy of the crystalline substances can be calculated easily

Heat of formation of the product and the lattice energy of the substance can be calculated simultaneously

The number of bonds in nitrogen molecule is

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One o and oneπ

One o and twoπ

Three sigma only

Two o and twoπ

Half life period for 235 U is

92

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710 million years

810 milion years

720 million years

820 million years

Ionic solids are characterized by.

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Low melting points

High vapour pressures

Good conductivity in solid state

Solubility in polar solvents

The real gas obeying Van der Waal's equation will resemble ideal gas is.

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both 'a' and 'b' are large

both 'a' and 'b' and small

'a' is small and 'b' is large

'a' is large and 'b' is small

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