Question # 1

Ethyl alcohol on reacting with orthoboric acid form

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Ethyl borate

Boric acid

Boron acetate

Borax

Co-ordination number of Cu in

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Zero

Two

Four

Six

The chemical formula of Sodium Bromite is.

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NaBrO

NaBrO2

NaBrO3

NaBrO4

When Cu reacts with conc. HNO3 , which one of the following gases is evolved

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N2O

NO

NO2

N2O5

Ecosystem is smaller unit of

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Lithosphere

Hydroshpere

Amosphere

Biosphere

Vinyl acetylene combines with HCl to form

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Polyacetylene

Benzene

Chloroprene

Divinyl acetylene

Which of the following is not directly prepared from CH₃COOH

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Ethyl acetate

Acetyl chloride

Acetic anhydride

Acetamide

Which three elements are needed for the healthy growth of plants.

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N,S,P

N, Ca, P

N,P,K

N,K,C

In which group, melting point and boiling point increase downward in a group

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IA

II A

VII A

Both a and b

Out of the elements of group VA, the highest energy is possessed by

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N

P

Sb

Bi

An alkyl halide may be converted to alcohol by

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Addition

Substitution

Dehydrohalogenation

Elimination

Which element burns in nitrogen atmosphere to form nitride.

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Mg

Al

Both a and b

None of these

The word paper is derived from the name of which reedy plant

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Rose

Sun flower

Papyrus

Water Hyacinth

Which raw material is used for preparation of bleaching powder.

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Cl2 and H2O

Cl2 and Lime

Cl2 and HOCl

HCl and Lime

Which element form an ion with charge +3

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Beryllium

Aluminum

Carbon

Sillicon

In primary alkyl halides, the halogen atom is attached to a carbon which is further attached to how many carbon atoms

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Two

Three

One

Four

Which element reacts with alkali and H2 gas is produced.

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Be

Mg

Ca

Sr

Which one of the following elements has no variable valency.

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Zinc

Iron

cobalt

Manganese

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