Question # 1

Ionic bond is formed by combination of groups

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IA and VIII

II A and VII A

IV A and VA

VIA and VII A

Which of the following particles would on losing an electron has its outermost p-orbital as half filled

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Nitrogen atom

O⁺ion

P^-1ion

S⁺¹ion

Isotopes differ in.

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Properties which depend upon mass

Arrangement of electrons in orbitals

Chemical properties

None of these

Bromine has isotopes

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2

4

8

6

Melting of ice can be forwarded by the use of.

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LiCl

BeCl2

NaCl

Ag Cl

The boiling point of pure water at 1 atm pressure is.

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98^oC

100^oC

69^oC

120^oC

In the ground state of an atom, the electrons is present.

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In the nucleus

In the second shell

Nearest to the nucleus

Farthest form the nucleus

Relative lowering of vapour pressure is equl to.

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Mole fraction of solute

Mole fraction of solvent

Molarity

Molality

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

The number of bonds in oxygen molecules.

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One sigma and One pi

One sigma and two Pi

Three sigma only

Two sig and two pi

In which compound oxidation state of chlorine is +5

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NaCl

HOCl

NaClO3

NaClO2

Many element have fractional atomic masses. This is because.

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the mass of the atom is itself fractional

Atomic masses are average mases of Isobars

Atomic masses are average masses Isotopes

Atomic masses are average masses of Isotopes proportional to their relative abundance.

The molar volume of CO2 is maximum at.

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STP

127 ^oC and 1 atm

0 ^oC and 2 atm

273 ^oC and 2 atm

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

Which of the following species has unpaired electrons in anti-bonding molecular orbitals

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O₂⁺²

N₂^-2

B₂

F₂

When 6d orbital is complete, the entering electron goes into.

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7f

7s

7p

7d

An atomic orbital has l =1 , m =+1, 0, -1, n = 3 than which one of the following atomic orbital has such values.

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2s

2p

3p

3d

If an endothermic reaction is allowed to take place very rapidly in the air, the temperature of the surrounding air

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Remains constant

Increase

Decrease

Increase a bit

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