Question # 1

The pH of rain water is

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6.5

6.0

6.2

6.4

The ionization potential is lowest for the

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Halogens

Inert gases

Alkaline earth metals

Alkali metals

According to the modern periodic law, the physical and chemical properties of elements are periodic function of their:

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atomic size

atomic volume

atomic weight

electronic configuration

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Positive

Negative

Zero

Cannot be predicted

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

The rate of a chemical reaction is directly proportional to product of major concentration of reaction substance. It is called:

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Law of conservation of energy

Law of mass action

Rate law

Active mass rule

If pH of buffer of 1 mole dm^-3of HCOOH + 0.1 mole dm^-3HCOONa having pKa = 3.78 is

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1.78

2.78

3.78

4.78

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

Which of the following sets of atomic numbers belong to that of the alkali metals?

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1, 12, 30, 4, 62

37, 19, 3, 55

9, 17, 35, 53

12, 20, 56, 88

The pair of atomic number that represents elements which are both s-block elements is:

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3, 2

7, 15

6, 12

9, 17

The rate at which a substance reacts is directly proportional to its active mass and the rate of reaction is directly proportional to the product of the active masses of reacting substances is known as

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Le-chatelier's principle

Law of conservation of energy

Law of mass action

None of all

Sixth period of periodic table contains number of elements:

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10

18

32

8

At 1000 C, the equilibrium constant for the reaction of carbon monoxide and oxygen to produce carbon dioxide is very large (K_c= 1.2 x 10²²). When the reaction is at equilibrium the

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Concentration of carbon dioxide will be much larger than one or both reactant

Concentration of carbon dioxide will be much smaller than concentrations of both reactants

Concentration of carbon monoxide will be much larger than the concentration of carbon dioxide

Concentrations of both reactants must be much smaller than the concentration of carbon dioxide

An atom with high electronegativity has

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Large size

High ionization potential

Low electron affinity

Low ionization potential

pH of human blood is

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7

7.25

7.35

7.47

The valency of noble gases, in general is

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Zero

One

Three

Two

The defects in the Mendeleev's Periodic table is/are:

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in spite of their different properties, alkali metals and coinage metals have been grouped together

K(at.wt.39.1)has been placed after argon (at.wt.39.9)

similar elements lime Cu and Zn have been placed different groups

all above statement are correct,

The equilibrium constant can be used to predict

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Direction of reaction

Extent of a reaction

Effect of changing condition

All of these

The ionic product of solution is greater than solubility product. The solution is

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Saturated

Unsaturated

Supersaturated

None of all

The compound having lowest boiling point is:

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H₂S

H₂Se

SiH₄

SnH₄

A large value of K_cmeans that at equilibrium:

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Less reactants and more products

Reactants and products in same amount

More reactants and less products

None of above

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