Question # 1

The element with highest electron affinity among the halogen is

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F

CI

Br

I

Units of Kw are

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mole dm^-3

mole²dm^-3

mole²dm^-6

mole²dm^-3

Mark the incorrect statement:

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metallic character increases down the group

metallic character increases along a period

metallic character decreases along period

metallic character remain the same down the group

The solubility of KCIO₃salt in water is decreased by adding

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NaClO₃

NaCl

KCIO₄

KCl

Conjugate base of a very weak acid is:

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Relatively strong base

Relatively weak bass

Relatively very strong base

^{Relativelyvery weak base}

Among O, C, F, CI, Br, the correct order of increasing radii is

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F O C CI Br

F C O CI Br

F CI Br O C

C O F CI Br

Mark the name of scientist who gave the concept of atomic number:

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Moseley

Dalton

Newland

Newton

pH of 1 molar NaOH is

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7

zero

14

10

Which of the following elements has greatest value of first ionization energy

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N

O

C

B

In 1000 molecules of 0.001 M acetic acid the number of H⁺ions is 12.6, then its percentage of ionization is

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1.33%

1.26%

12.6

1%

Which of the following is an inert gas?

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H₂

O₂

N₂

Argon

No of moles of H₂O in one dm³

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6.02 x 10²³

6.02 x 10^-23

1000

55.5

point out the correct statement:

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covalent character of metal halides increase from left to right in a period

boiling points of group IVS hydrides decrease down the group

ionic character of group IIA oxides decreases on descending the group

the basicity of group IIA oxides decreases on descending the group

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

pH of water at 25°C q

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9.5

7.5

7.0

5.5

The pH of neutral solution having pKw = 13.26 at 50°C is

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6

6.63

7

7.13

Which among the following species has the highest ionization energy?

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Ne

F

Li

B

The value of K_pis greater than K_cfor a gaseous reaction when

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number of molecules of products is greater than the reactants

number of molecules of reactants is greater than those of products

number of molecules of reactants and products equal

catalyst is added

A catalyst merely speeds up the attainment of equilibrium by lowering the

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energy of activation

entropy

enthalpy

internal energy

Which of the following species has the highest ionization potential?

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Ne

AI⁺

Mg⁺

Li⁺

Which of the following elements is most electronegative?

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Oxygen

Chlorine

Nitrogen

Fluorine

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