Question # 1

Le-Chatelier's principle is concerned with

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catalysis

photolysis

photosynthesis

chemical equilibrium

In the periodic table, the element with atomic number 16 will be placed in the group

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Fourteen

Sixteen

Thirteen

Fifteen

Strength of an acid can be determined by

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K_a

K_b

pOH

pK_w

The value of K_c

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does not change with the increase in temperature

changes with change of temperature

does not change with the decrease in temperature

none of these

Common ion effect finds extensive application in the:

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Qualitative analysis

Quantitative analysis

Preparations of buffers

Both (b) and (c)

In salt analysis 3rd group basic radicals (Al₃₊, Fe³⁺etc) are detected by adding NH₄Cl to the salt solution and then NH₄OH. 3rd group radicals are precipitated as hydroxide. In this process

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NH₄Cl will ionize to a lesser extent in presence of NH₄Cl

NH₄Cl will precipitate

NH₄Cl will react with NH₄Cl

AL³⁺will precipitate as AlCl₃

When 6g acetic acid (0.1 M) is dissolved in 1000 cm³of the solution only ______ molecules ionize out of every 1000 CH₃COOH moleccules

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1.33

13.3

133

13

The elements with atomic numbers 9, 17, 35, 53, 85 and all

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Noble gases

Halogens

Heavy metals

Light metals

Almost forward reaction is complete when value of K_cis:

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Neither large nor very small

Very small

Very large

Negligible

The solubility of KCIO₃salt in water is decreased by adding

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NaClO₃

NaCl

KCIO₄

KCl

A solution of NaOH has pH = 13, then concentration of NaOH is

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10^-13 M

10¹³M

10^-1M

10⁺¹M

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

Germanium is a:

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metal

non-mental

transition

metalloid

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mol dm^-1

mol^-1dm³

mol^-2dm³

None of these

The solution having zero pH will be

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Basic

High basic

Highly acidic

Neutral

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Total pressure

Catalyst

Concentration of H₂and l₂

Temperature

Which statement is incorrect for a buffer solution

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A solution of strong acid and salt of this acid with strong base

A solution of weak base and salt of this base with strong acid

A solution of mixture of weak acid and its salt with strong base

A solution which resists the change in its pH value by adding small quantity of acid or base

Neutralization of a strong acid with a strong base is

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Chemical equilibrium

Spontaneous reaction

Reversible process

Non-spontaneous

Who introduced the term pH

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Henderson

Sorenson

Thomson

Goldstein

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

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electronegativity

atomic radii

ionization potential

atomic mass

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

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8

18

10

32

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