True-False

Question 11 Mark

Most of the detergents are biodegradable.

Answer

False.
Correct statement: Most of the detergents are non-biodegradable.

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Question 21 Mark

Soap has greater foaming capacity.

Answer

False.
Correct statement: Soap has a poor foaming capacity.

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Question 31 Mark

Soap forms a scum in hard water.

Answer

True.

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Question 41 Mark

Hard water limits the cleaning action of soap.

Answer

True.

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Question 51 Mark

Hard soaps are used for cleaning the body.

Answer

False.
Correct statement: Soft soaps are used for cleaning the body.

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Question 61 Mark

IUPAC stands for International Union of Pure and Analytical Chemistry.

Answer

False.
Correct statement: IUPAC stands for International Union of Pure and Applied Chemistry.

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Question 71 Mark

Chemical properties of the members of a homologous series are similar.

Answer

true

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Question 81 Mark

Saturated compounds, decolourise the bromine water.

Answer

False.
Correct statement:

Unsaturated compounds, decolourise the bromine water.
Saturated compounds do not decolourise bromine water.

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Question 91 Mark

The boiling point of hydrocarbons increases with an increase in the number of carbon atoms.

Answer

True.

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Question 101 Mark

Furan is a carbocyclic compound.

Answer

False.
Correct statement: Furan is a heterocyclic compound.

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Question 111 Mark

Organic compounds have high melting and boiling points.

Answer

False.
Correct statement: Organic compounds have low melting and boiling points.

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Question 121 Mark

The organic compound is less reactive than inorganic compounds.

Answer

True.

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Question 131 Mark

Organic compounds have a high molecular weight and a simple structure.

Answer

False.
Correct statement: Organic compounds have a high molecular weight and a complex structure.

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Question 141 Mark

Removal of carbon dioxide is known as dehydrogenation.

Answer

False.
Correct statement: Removal of carbon dioxide is known as decarboxylation.

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Question 151 Mark

Methanol is oxidised to methanal in the liver and reacts with components of cells.

Answer

True.

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Question 161 Mark

On cooling, pure ethanol is frozen to form ice – like flakes.

Answer

False.
Correct statement: On cooling, pure ethanoic acid is frozen to form ice – like flakes.

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Question 171 Mark

Consumption of ethanol slows down the metabolism of our body and depresses the central nervous system.

Answer

True.

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Question 181 Mark

Ethanol affects the optic nerve causing blindness.

Answer

False.
Correct statement: Methanol affects the optic nerve causing blindness.

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Question 191 Mark

Ethanol is a clear liquid with burning taste whereas ethanoic acid is a colourless liquid with a sour taste.

Answer

True.

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Question 201 Mark

Rectified spirit on heating with Cone. $H _2 SO _4$ for about 5 to 6 hours and allowed to stand for 12 hours to get absolute alcohol.

Answer

Correct statement: Rectified spirit on heating with quicklime for about 5 to 6 hours and allowed to stand for 12 hours to get absolute alcohol.

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Question 211 Mark

Molasses is a dark coloured syrupy liquid left after the crystallization of sugar from sugarcane juice.

Answer

True.

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Question 221 Mark

Decolourisation of bromine takes place in saturated compounds.

Answer

False.
Correct statement: Decolourisation of bromine takes place in unsaturated compounds.

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Question 231 Mark

The chemical properties of the members of each homologous series are similar.

Answer

True.

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Question 241 Mark

All members of each homologous series contain different elements and different functional groups.

Answer

False.
Correct statement: All members of each homologous series contain the same elements and same functional groups.

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Question 251 Mark

Alcohols react with sodium metal to liberate oxygen gas.

Answer

False.
Correct statement: Alcohols react with sodium metal to liberate hydrogen gas.

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Question 261 Mark

Carbon compounds have high melting and boiling points because of their electrovalent nature.

Answer

False.
Correct statement: Carbon compounds have low melting and boiling points because of their covalent nature.

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Question 271 Mark

Carbon compounds show isomerism and possess the characteristic property catenation.

Answer

True.

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Question 281 Mark

The characteristics of a carbon atom by virtue of which it forms four covalent bonds are referred to as catenation.

Answer

False.
Correct statement: The characteristic of a carbon atom by virtue of which it forms four covalent bonds is referred to as tetravalency of carbon.

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Question 291 Mark

Carbon atoms form the building blocks of living organisms.

Answer

True.

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Question 301 Mark

Carbon circulates through air, plants, animals and soil by means of complex reactions is called the Kreb cycle.

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