Question # 1

Which substances do nto react immediately with bromine water:

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ethane

benzene

ethene

phenol

Benedict solution gives a positive test with but catalyze the same reaction:

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fructose

glucose

starch

sucrose

Water which his considered to be safe for human consumption is known as

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distilled water

contaminated water

potable water

rain water

Which is trigonal crystal

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CaSO₄. 2H²O

MgSO₄

NaNO₃

All

Metallic bonds have been explained by many theories. Luis Pauling has proposed a theory called

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molecular orbital theory

electron gas theory

band theory

valence bond theory

Primary pollutants are:

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oxides of sulphur

oxides of carbon

oxides of nitrogen

All of these

In incinerating the waste is burnt at

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1000°C

100°C

2000°C

1500°C

Elements in lithosphere exist generally as:

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metals

non-metals

metalloids

minerals

Glass is a

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Micro-crystalline solid

Super-cooled liquid

Gel

Polymeric mixture

Surfactants are organic compounds; used in detergents which reduce the

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viscosity of water

surface tension of water

boiling point of water

wetting ability of water

Which if the following will have the same number of molecules at S.T.P?

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280cm³ of CO₂ and 280cm³ of N₂O

11.2dm³ of O₂and 32g of O₂

44g of CO₂and 11.2dm³ of CO

28g of N₂and 5.6dm³ of oxygen

Which of the following derivative can not be prepared directly from acetic acid

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Acetamide

Acetyl chloride

Acetic anhydride

Ethyl acetate

Down's cell is used to prepare

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Sodium carbonate

Sodium bicarbonate

Sodium metal

Sodium hydroxide

Ozone hole is maximum over

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Europe

Antarctica

Asia

Africa

The liquid obtained after passing the mixture through filter paper is termed as:

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Extract

Residue

Filtrate

Sample

The cell in which a non-spontaneous redox reaction takes place as a result electricity is known as :

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Electrolytic cell.

Voltaic cell.

Daniel cell.

Dry cell.

Heat absorbed by a system when its volume does not change is equal to

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Internal energy of system

Enthalpy of system

Increase in internal energy of system

Increase in enthalpy of system

Substituted phenyl groups are called

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acyl groups

phenyl groups

Aryl groups

Alkyle groups

Variable valency is generally exhibited by

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Normal elements

Transition elements

Metallic elements

None of these

Which of the following salts mixed with ice to make the freezing mixture used in ice cream machine

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KNO₃

NH₄NO₃

AgNO₃

Mg(NO₃)₂

Group VI-B of transition elements contains:

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Zn, Cd, Hg

Fe ,Ru ,Os

Cr, Mo ,W

Mn, Te, Re

The shape of gaseous SnCl₂is

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Tetrahedral

Linear

Angular

T-shaped

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