Question # 1

The energy required in addition to average energy of reactants to convert them into products is called

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enthalpy function

heat of reaction

effective energy

activation energy

In the long form of the periodic table all the non-metals are placed in

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s-block

f-block

p-block

d-block

Le-Chatelier's principle on the reversible reactions in order to

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Determine the rate of reaction

Find the best condition of favourable shifting the position of equilibrium

Predict the reaction of reaction

Determine the extent of reaction

The element having largest radius is:

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F

I

CI

Br

At 90°C, pure water the [H₃O⁺] = 10^-6mol L^-1. The value of k_wat 90°C is

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10^-6

10^-8

10^-12

10^-14

The atomic radius increases as we move down a group because

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Effective nuclear charge increases

Atomic mass increases

Additive electrons are accommodated in new electron level

Atomic number increases

A solution has pH = 0, its H⁺ion concentration is

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1 x 10^-14

1 x 10¹⁴

1 x 10¹

1

pH of water is 7, if 0.01 M NaOH is added, than its pH is

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12

14

zero

10

The discovery o which of the followin group of elements gave blow to the Newland's law of octaves

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actinides

inert gases

alkaline earths

rare earths

All of the following are the postulates of Arrhenius theory of ionization except

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Ionization is reversible process

Electrical conductivity of a solution of an electrolyte depends on the extent to which the electrolyte ionize in solution

Strong electrolyte ionize to a greater extent in water

Electrolyte ionize in water to produce cations and anions

In the formation of ammonia if pressure of the system is increased then the reaction _______ direction

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Moves in forward

Moves in backward

Remains in equilibrium

None

The correct arrangement of increasing order of atomic radius among Na, K, Mg, Rb is

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Mg < K < Na < Rb

Mg < Na < K < Rb

Mg < Na < Rb < K

Na < K < Rb < Mg

Almost forward reaction is complete when value of K_cis:

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Neither large nor very small

Very small

Very large

Negligible

Who studied the effect of temperature on equilibrium

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Van der Waal

Vant Hoff

Arrhenius

Lewis

The attraction that an atom exerts on a pair of electrons that are being shared with another atom for forming covalent bond is referred to as its

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Electron affinity

Electronegativity

Ionisation energy

Valency

If the difference of pKa valued of two acid is two then acid with smaller pKa is stronger than others

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2 times

10 times

1000 times

100 times

The substance which increase rate of reaction but remains unchanged at the end of reaction is called:

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Catalyst

Indicators

Promoter

Activator

If we increase pressure in decomposition of PCl₅will favour the raction in

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Forward direction

Backward direction

At equilibrium

No effect

An atom with high electronegativity has

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Large size

High ionization potential

Low electron affinity

Low ionization potential

If we increase the pressure in decomposition of PCl₅it will favour the reaction in

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Forward direction

Backward direction

Equilibrium direction

None

Select the hydride among the followings that has highest boiling point:

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SnH₄

GeH₄

SiH₂

CH₄

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