Question # 1

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

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Forward direction

Backward direction

At equilibrium

No effect

Human blood has a pH of:

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8.35

9.35

7.35

6.35

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

Which of the following electronic configuration represents an inert gas?

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2, 8, 2

2, 8, 1

2, 1, 7

2, 8, 8

Which of the following groups of periodic table has entirely metals?

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IV

II

VI

VII

Which of the following pH is considered as acidic?

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9

11

8

1

Kc < [ products]/[Reactants] favors

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Low of mass action

Rate expression

Forward reaction

Backward reaction

Which of the following ion has the highest value of ionic radius?

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Li⁺

F^-

O^2-

B³⁺

Californium is the member of:

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alkali metals

alkaline earth metals

actinide series

lanthanide seires

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

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8

18

10

32

The alkali metal which is liquid at 15°C is

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K

Cs

Na

None

If the atomic number of an element of an element is 33, it will be placed in the periodic table in:

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first group

fifth group

third group

seventh group

Which of the following is intermediate hydride

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MgH₂

NH₃

HF

NaH

Which one of the following is a buffer

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HCl + NaCl solution

CH₃COOH + CH₃COONH₄solution

H₂SO₄+ CaSO₄solution

CH₃COOH+ CH₃COONa

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

One litre of water contains 10^-7moles of H⁺ions. Then moles of H₂O ionized per litter will be

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1 x 10^-7

0.8 x 10^-9

3.6 x 10^-7

3.6 x 10^-9

pKb value of NH₄OH is 4.74. if the concentration of NH₄OH is 1 molar containing 0.1 molar NH₄Cl, then pH of this buffer will be

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3.74

10.26

4.74

9.26

Units of K_ware

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Mol dm^-3

Mol^-2dm⁺⁶

Mol²dm^-6

Mol²dm^-3

Element of the same vertical group of the periodic table contain:

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same number of atoms

same number of electrons in outermost shell of their atoms

same electronic configrution

same atomic size

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