Question # 1

Which among the following species has the highest ionization energy?

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Ne

F

Li

B

Which of the following can affect the magnitude of equilibrium constant K_pof a reversible gaseous reaction:

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Temperature

Catalyst

Pressure

All of above

Which pair of the following pairs of elements belongs to same period of periodic table?

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CI, Br

Na, Ca

Ca, CI

Na, Cl

Which of the following alkali metals does not exist naturally

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Francium

Rubidium

Lithium

Cesium

Keeping in view the sizer of the atoms , which order in correct one:

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B > Ga

Ba > Mg

Lu > Ce

CI > I

Kc < [ products]/[Reactants] favors

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Low of mass action

Rate expression

Forward reaction

Backward reaction

The oxide of which of the following elements will be acidic in character

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Mg

Rb

Li

CI

The pH of 0.001M NaOH aqueous solution is:

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13

11

9

8

The number of elements in fourth period of periodic table is:

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8

18

10

32

Which one of the following aqueous solutions has lowest pH:

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0.1M Ba(OH)₂

0.1M NaOH

0.1M KOH

0.1M HCI

When sodium hydride is electrolyzed, hydrogen is liberate:

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at anode

at cathode

in electrolyte

none of all

Which of the following has highest first ionization potential?

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Carbon

Oxygen

Nitrogen

Boron

In llnd period of periodic table, a regular decreace in found in

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electronegativity

atomic radii

ionization potential

atomic mass

Which of the solution among the following has highest pH

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0.02 M Ch₃COONa

0.01 M NaHCO₃

0.01 M NaOH

0.1 M H₂SO₄

The pH of 10^-3mol dm^-3of an aqueous solution of H₂SO₄is

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3.0

2.7

2.0

1.5

Which of the following groups of periodic has metlliod?

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VIA

IA

IIA

none of these

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

The substance which accept proton is a base favours concept

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Arrhennius

Lewis

Lowery Bronsted

Lux.flood

Which of the following oxides of manganese is more acidic in nature

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MnO

Mn₂O₃

MnO₂

Mn₂O₇

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

The best buffer is prepared when molar concentrations of the salt and acid are equal, then its pH and pKa value are related

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pH = pKa

pH < pKa

pH > pKa

pH x pKa = 14

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