Question # 1

In a group IIA from top to bottom as the atomic number increases, there is regular decreases in

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Ionic size

Atomic size

Ionization potential

None of these

Which of the following is formed by the action of water on sodium peroxide?

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H₂

N₂

O₂

CO₂

The oxyacids of phosphorus in which phosphorus has the lowest oxidiation state is

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Hypophosphorus acid

Orthophosphorus acid

Pyrophosphorus acid

Metaphosphorus acid

Which of the following sulphates has the highest solubility in water

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BaSO₄

CaSO₄

MgSO₄

BeSO₄

The metal with highest electrical resistance at room temperature is

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Pb

Te

Po

Fe

Which of the following is the hardest metal among following

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Li

Na

Rb

K

Alkali metals react violently with halogens to form

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Hydrides

Halides

Anyhydrides

None of these

The acid which has a peroxy linkage is

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Sulphurous acid

Pyrosulphuric acid

Dithionic acid

Caro's acid

Which of the following sulphates is not soluble in water

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Sodium sulphate

Potassium sulphate

Zinc sulphate

Barium sulphate

Phosphorus pentoxide finds use as

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An oxidizing agent

A reducing agent

A bleaching agent

A dehydrating agent

The silver bromide in hypo (Na₂S₂O_{3) solution is}

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Soluble

Not soluble

Precipitated

Not effect

Which one of the following does not belong to alkaline earth metals

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Be

Ra

Ba

Rn

Silicon atom is hybridized:

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sp

sp²

sp³

dsp²

Heavy water is obtained by

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Prolonged electrolysis of water

Dissolving heavy salt in water

Simple distillation of water

Removing impurities of calcium and magnesium form water

White phosphorus is

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A mono atomic gas

P₄, a tetrahedral solid

P₈, a crown

A linear diatomic molecule

Density of aluminium is (g cm^-3):

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B

Al

Si

Ge

The oxidation number of each element of group ll-A is

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0

+1

+2

-1

Which of the following salt is used as purgative

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CaSO₄

MgSO₄

BeSO₄

NaCl

Aluminium oxide is:

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Acidic oxide

Basic oxide

Amphoteric oxided

None of these

Pb has inert pair of electrons:

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One

Two

Three

Four

______ gives peroxide

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Li

Ba

Sr

Be

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