Question # 1

Which form of phosphorus is more stable.

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White

Red

Black

Both a and b

Which one of the following group of Periodic table called chalcogen family.

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Group III A

Group VA

Group VI A

Group VII A

NO2 can be obtained by heating.

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NaNO3

KNO3

Pb(NO3)2

NH3NO3

Which of the following has highest boiling point

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Methanal

Ethanal

Propanal

2-hexanone

The benzene molecule contains.

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Three double bonds

Two double bonds

One double bonds

Delocalized sigma electron charge

Which one of the following is an amide

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(NH₂)₂CO

NH₂.CH₃

C₆H₅NH₂

N(CH₃)₃

------------------- is not a nucleophile

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H₂O

NO₃

BF₃

NH₃

The reactivity order of alkyl halides for a particular alkyl group is.

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Fluoride > Chloride > Bromide > Iodide

Chloride > Bromide >Chloride > Fluoride

Iodide > Bromide > Chloride > Fluoride

Bromide > Iodide > Chloride > Fluoride

Usually the percentage of moisture is paper is

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1- 3%

4-6%

6-8%

5%

Bleaching powder may be produced by passing chlorine over.

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Calcium carbonate

Hydrated calcium sulphate

Anhydrous calcium sulphate

Calcium hydroxide

The most electronegative element of group V-A is

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N

P

Sb

Bi

In a period, from left to right in the periodic table, the size of atom generally.

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Increases

decreases

Remains constant

First increase upto the middle of period and then decreases

Which of the following acids possess oxidizing and reducing properties.

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HCl

HNO2

HNO3

H2SO4

In which block of periodic table non metals are present.

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s

p

d

f

The Plastic which become soft and melt on heating and can be molded and remolded are called.

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Thermoplastic

Thermosetting plastic

Resin

Melamine

Which class of elements shows law value of first ionization potential.

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Alkali metals

Alkaline earth metals

Halogens

Noble gases

Hydrolysis of benzene sulphonic acid with superheated steam or by boiling with dil HCl gives.

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Toluene

Benzene

Xylene

Chlorobenzene

Which compound is alicyclic in nature.

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Cyclobatane

Iso batane

n butane

Toluene

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