Question # 1

Which one of the following metal cannot evolve hydrogen from acetic acid.

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Sodium

Potassium

Magnesium

Zinc

Starch is

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Monosaccharide

Disaccharide

Polysaccharide

Oligosaccharide

An sp3- hybrid orbital contains.

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25% s- characters

50% s- characters

75% s- characters

100% s - characters

Which element when react with chlorine form polymeric halide.

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Na

Be

Ba

P

In group V-A elements the most electronegative elements is

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Sb

N

P

As

Main source of aromatic compound is

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Petroleum

Coaltar

Living organisms

Dead marine animals

SO2 is not absorbed in water directly to form H2SO4 because.

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The reaction does not go to completion

The reaction is quite slow

The reaction is exothermic

SO3 is insoluble in water

Typical transition element is

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Sc

CO

Ra

Y

The substance which is added to remove impurities is known as

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Slag

Flux

Ore

Gangue

Among the following the compound that can be most readily suphonted is.

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Toluene

Benzene

Nitrobenzene

Chlorobenzene

During nitration of benzene, the active nitrating agent is

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NO₃

NO₂⁺

NO₂^-

HNO₃

In which group of periodic table is the element which has atomic number 14.

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II

IV

III

VI

The pH range of the acid rain is

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7-6-5

6.6-6

6-5.6

less than 5

Boric acid cannot be used

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As antiseptic in medicine

For washing eyes

In soda bottles

For Enamals and Glazes

Dolomite is a carbonate of

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Be

Mg

Na

Ba

Woody raw material for paper pulp is obtained from

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Cotton

Bagasse

Poplar

Rice straw

A cyanohydrin is formed by the reaction of

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Alcohol and HCN

Ketone and NH3

Aldehyde and NH2OH

Aldehyde and HCN

Formalin is

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10% solution of formaldehyde in water

20% solution of formaldehyde in water

40% solution of formaldehyde in water

60% solution of formaldehyde in water

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