Question # 1

Which of the following bond s is expected to b the weakest.

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Cl-Cl^-

C-C

F-F

O -O

Number of isotopes of hydrogen is

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2

5

4

3

/which of the followign elements is presnt in group IA.

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Lithium

Hydrogen

Sodium

All of these

When new bonds ae formed, the energy is

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Consume

Remain same

Release

None of these

When NaOH and HCl are mixed the temperature increases. The reaction

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Exothermic with a negative enthalpy chagne.

Endothermic with a positive enthaly change.

Endothermic with a negatie enthalpy change

Exothermic with a positive enthealpy change

Ionic compund have

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Low melting and high boiling points

Low melting and boiling point

High melting and boiling points

High meilting and low boiling points

When we mvoe top to bottom in group, ionization energy.

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Increases

No effet

Decreases

None of these

Ammonia is a base, because it

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Ionizes in water to give OH- Ions

Can accept proton

Contains OH group

Can accept an election pair

Which branch of chemistry is athe study elements and their compounds except for organic compounds?

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Physical Chemistry

Geochemisty

Organic chemistry

Inorganic chemistry

According to Arrhenius concept base is a substance which dissociates in aqueios solution to give

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Hydroxide ions

Hydrogen ions

Pair of Electrons

Proton

Which molecule contains a single vovalent bond.

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CH4

C2H4

C2H2

O2

A base is a substance which neutralizes an acid. Which of these substances is not aa base.

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Aqueious ammonia

Calcium oxide

sodium Chloride

Sodium carbonate

The solubility of which salt decreases with the increase of temperture.

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KNO3

Li2SO4

KCl

NaNO3

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