Tag: chemistry

Questions Related to chemistry

Which of the following is a good conductor of heat?

chemistry matter in our surroundings diffusion in different states of matter properties of solids, liquid, and gas particle theory of matter

  1. Aluminium

  2. Sulphur

  3. Chlorine

  4. Oxygen

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Correct Option: A
Explanation:

Heat is thermal energy. It can be transferred from one place to another by conduction. Metals are good conductors of heat, but non-metals and gases are usually poor conductors. Poor conductors are called insulators.

Which of these is a property of a solid.

chemistry matter in our surroundings diffusion in different states of matter properties of solids, liquid, and gas particle theory of matter

  1. Has a definite shape

  2. Has a definite volume

  3. Doesn't have a fixed shape

  4. Doesn't have a fixed volume

Show answer
Correct Option: A,B
Explanation:

A solid has a definite volume. It also has a definite shape.
The intermolecular forces in the case of a solid are very high compared to liquids and gases and hence a solid are held together tightly. Thus, a solid has a definite shape.


Hence, the correct options are $A$ and $B$

Which of these is a property of a gas.

chemistry matter in our surroundings diffusion in different states of matter properties of solids, liquid, and gas particle theory of matter

  1. Has a fixed volume

  2. Has a fixed shape

  3. Doesn't have a fixed volume

  4. Doesn't have a fixed shape

Show answer
Correct Option: C,D
Explanation:

The intermolecular forces in the case of gas are very very weak and hence the gas molecules are not at all held tightly. Thus a gas doesn't have a fixed shape at all.
Gases do not have a fixed volume too. It has the volume of the container in which it is kept.


Hence, the correct options are $C$ and $D$

Look at the classification table below. Which of the following sets of headings is correct?

I II III
Oil Snow Wind
Paint Crayon Oxygen

chemistry matter in our surroundings diffusion in different states of matter properties of solids, liquid, and gas particle theory of matter

  1. (I) Gas (II) Liquid (III) Solid

  2. (I) Liquid (II) Gas (III) Solid

  3. (I) Liquid (II) Solid (III) Gas

  4. (I) Solid (II) Gas (III) Liquid

Show answer
Correct Option: C
Explanation:
Oil and paint exist in the liquid state, crayon and snow are in the solid-state while wind and oxygen exist in the gaseous state. Hence, I - liquid, II - solid and III - gas.

Hence, the correct option is $C$.

Mechanical work is specially important in systems that contains :

chemistry matter in our surroundings diffusion in different states of matter properties of solids, liquid, and gas particle theory of matter

  1. gas-liquid

  2. liquid-liquid

  3. solid-solid

  4. amalgam

Show answer
Correct Option: A
Explanation:

Mechanical work is important in systems that undergo appreciable change in volume. 


Since solids are incompressible, hence mechanical work is insignificant in solids. 

However, gases and liquids(to some extent) undergo appreciable change in volume and hence, mechanical work becomes important in case of gases and liquids.

Therefore, the option is A.

Which is not a property of solids

chemistry matter in our surroundings diffusion in different states of matter properties of solids, liquid, and gas particle theory of matter

  1. Solid are always crystalline in nature

  2. Solid have high density and low compressibility

  3. The diffusion of solid is very slow

  4. Solids have definite volume

Show answer
Correct Option: A
Explanation:

solids can be crystalline as well as amorphous in nature.

solids have definite volume.
solids are nearly compressible..
diffusion rate is almost zero for solids.
also solids have high density.
 
so the correct answer is A option.as it is the only option which is wrong here.

The kinetic theory considers all matter ( substances) to be made up of particles which are in continuous motion.

chemistry matter in our surroundings diffusion in different states of matter properties of solids, liquid, and gas particle theory of matter

  1. True

  2. False

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Correct Option: A
Explanation:

The kinetic theory considers all matter( substances) to be made up of particles which are in continuous motion. 


On raising the temperature, the solid-state, in which the particles are closely packed in regular arrangement changes into the liquid sate where particles are closely packed in a random arrangement. this process is called melting.

Hence, it is a true statement.

When a substance is heated kinetic energy of particles decreases.

chemistry matter in our surroundings diffusion in different states of matter properties of solids, liquid, and gas particle theory of matter

  1. True

  2. False

Show answer
Correct Option: B
Explanation:

Theoretically, heating a solid to higher and higher temperatures changes its phase to a liquid, and finally to a gas.
A solid consists of low kinetic energy vibrating particles locked into position by interparticle attractive forces. When heat is applied, energy is absorbed and the particles start vibrating more vigorously.

When heat is applied, energy is absorbed and the particles start vibrating more vigorously.

chemistry matter in our surroundings diffusion in different states of matter properties of solids, liquid, and gas particle theory of matter

  1. True

  2. False

Show answer
Correct Option: A
Explanation:

A solid consists of low kinetic energy vibrating particles locked into position by interparticle attractive forces. When heat is applied, energy is absorbed and the particles start vibrating more vigorously.

Molecules in solids:

chemistry matter in our surroundings diffusion in different states of matter properties of solids, liquid, and gas particle theory of matter

  1. are free to move about

  2. cannot move

  3. can slide over each other

  4. tend to fly away

Show answer
Correct Option: B
Explanation:

Molecules in solid are tightly packed together and cannot move.