Question # 1

Potassium is kept in

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Water

Ammonia

Alcohol

Kerosene.

Among alkali metal salts, the lithium salts are the poorest conductors of electricity in aqueous solution because of

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Easy diffusion of Li⁺ions

Lower ability of Li⁺ions to polarize water molecules

Lowest charge to radius ratio

Higher degree of hydration of Li⁺ions

Calcium acetate when dry distilled

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Formaldehyde

Acetaldehyde

Acetone

Acetic anhydride

Which of the following belongs to the halogen family?

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Francium

Polonium

Radium

Astatine

Ozane is not

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An allotrope

A powerful oxidizing agent

Paramegnetic

a bent molecule

The valence orbital configuration of an element with atomic number 23 is

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3d⁵

3d³, 4s²

3d³, 4s¹, 4p¹

3d², 4s², 4p¹

Inter molecular forces in solid hydrogen are

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Covalent forces

Van der Waal forces or London dispersion forces

Hydrogen bonds

All of these.

Which of the following has linear shape?

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SP

SP²

SP³

None of the above

Most common reactions of benzene and its derivatives are

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Electrophilic addition reactions

Electrophilic subsitution reactions

Nucleoophilic addition reactions

Nucleophilic substitution reactions

Crystal can be classified in to -------------- basic crystal habits

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7

3

14

3

The freezing point of 1 molal NaCl solution assuming NaCl to be 100% dissociated in water in

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-1.86°C

-3.72°C

+1.86°C

+3.72°C

Rusting of iron is catalysed by

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Fe

O₂

Zn

H⁺

Evaporation of water is

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An exothermic change

an endothermic change

A process where no heat changes occur

A process accompanied by chemical reaction.

The rotation of two carbon atoms joined by double bond would happened only if

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P_ibond is broken

Sigma bond is broken

Both bonds are broken

None of above

The number of unpaired electrons in the p-subshell of oxygen atom

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1

2

3

4

The number of atoms contained in 11.2 L of SO₂at S.T.P are

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3/2 x 6.02 x 10²³

2 x 6.02 x 10²³

6.02 x 10²³

4 x 6.02 x 10²³

Which one is not usually used for the crystallization?

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Acetone

Acetic acid

Sulphuric acid

Chloroform

Which of the following process is used to separate insoluble particles from liquids?

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Seperation

Filtration

Crystallization

Condensation

In the manufacture of iron from haematite, limestone is added to act as.

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Flux

A reducing agent

Slag

An oxidizing agent

Aluminothermy used for on the spot welding of large iron structure is based upon the fact that

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As compared to iron, aluminium has greater affinity for oxygen

As compared to aluminium, iron has greater affinity for oxygen

Refraction between aluminium and oxygen is endothermic

Reaction between iron and oxygen is endothermic.

Given below are some statements concerning formic acid, which of them is true?

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It is a weaker acid than acetic

it is a reducing agent

When its calcium salt is heated, it forms a ketone

It is an oxidizing agent

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