Question # 1

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

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Very small size of nitrogen

Lone pair of electron present on nitrogen

enhanced electronegative character of nitrogen

Pyramidal structure of NH3

Photosynthesis a photochemical reaction has order of reaction

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0

1

2

Fractional order

An azeotropic mixture of two liquids boils at lower temperature than either of them when.

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It is saturated

It shows positive deviation from Raoult's law

It shows negative deviation from Raoult's law

It is metastable

Conductivity of metal decreases by increasing temperature because.

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Atoms are converted to ions

Atoms oscillates and hinder the movement of free electrons.

Ions are converted into atoms

Velocity of mobile electrons increases

As compared to pure atomic orbitals the hybrid orbitals have.

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Low energy

High energy

Same energy

None of these

The paper at which separation of solute have been taken place is called.

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Retardation factor

Chromatogram

Base line

Solvent front

How many electrons can be accommodated in sub shell for which n = 3, l = 1

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6

8

18

32

The power of which the concentration of a substance appears in the rate expression is known as

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order of reaction with respect to that substance

Rate of reaction

Order of reaction

Molecularity of reaction

Which particle has a mass 1/1836 time, that of hydrogen.

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Proton

Positron

Electron

Neutron

The value of Rydberg constant is.

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1.6 x 10⁷ m-1

1.9768 x 10⁷ m-1

1.09678 x 10⁷ m-1

1.7904 x 10⁷ m-1

The e/m value for the positive rays in maximum for the gas.

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Helium

Oxygen

Nitrogen

Hydrogen

Which of the following molecules has a co-ordinate covalent bond

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NH₄CI

NaCI

HCI

AICI₃

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

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6s

6p

6d

6f

In NICAD dry cell, the cathode and anode is made up of.

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Ca and Ag

Ni and CdO2

NiO2 and Cd

Ag and Ag2O

The heat contents of the system of known as.

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Entropy

Enthalpy

Work

Free energy

The bond order of N2 molecule is.

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1

2

3

4

The sum of mole percent of all the components of solution is always equal to.

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Unity

100

Less than one

Less than 100

If reactants have very low activation energy it means that reaction is.

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Slow

Fast

Endothermic

Exothermic

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