Tag: chemistry

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Questions Related to chemistry

Multiple choice chemistry states of matter: boiling, evaporation and condensation atmospheric pressure and boiling point evaporation - factors and effects in daily life changes in physical state - boiling, evaporation and condensation

Which of the following is a volatile liquid?

  1. Alcohol

  2. Acetone

  3. Chloroform

  4. All of above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

A volatile liquid is one that evaporates or vaporizes quickly at room temperature. Volatile liquids have low boiling point. As a result, they evaporate very easily at room temperature. All the above liquids are volatile.

Multiple choice chemistry states of matter: boiling, evaporation and condensation atmospheric pressure and boiling point evaporation - factors and effects in daily life changes in physical state - boiling, evaporation and condensation

Why do we wear cotton clothes in summer?

  1. cotton absorbs water

  2. it leads to sweating

  3. both a and b.

  4. none of above
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Cotton absorbs water, and thus, causes sweating. Sweat comes out the clothing and in contact with the atmosphere. It evaporates taking up the heat from the surrounding and thus, gives a cooling effect.

Multiple choice chemistry states of matter: boiling, evaporation and condensation atmospheric pressure and boiling point evaporation - factors and effects in daily life changes in physical state - boiling, evaporation and condensation

A volatile liquid _____________.

  1. vaporizes quickly at room temperature

  2. solidifies quickly at room temperature

  3. liquifies quickly at room temperature

  4. does not vaporize quickly
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

A volatile liquid is one that evaporates or vaporizes quickly at room temperature. Volatile liquids have low boiling point. As a result, they evaporate very easily at room temperature.

Multiple choice chemistry states of matter: boiling, evaporation and condensation atmospheric pressure and boiling point evaporation - factors and effects in daily life changes in physical state - boiling, evaporation and condensation

The process by which molecules undergo a spontaneous transition from the liquid phase to the gaseous phase is called as:

  1. boiling

  2. sublimation

  3. evaporation

  4. condensation
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The process by which molecules undergoes a spontaneous transition from the liquid phase to the gaseous phase is called as evaporation. In evaporation due to increase of temperature rate of evaporation also increases.

Condensation is the reverse of evaporation in which water vapor converts into liquid water by decreasing temperature.  

Multiple choice chemistry states of matter: boiling, evaporation and condensation atmospheric pressure and boiling point evaporation - factors and effects in daily life changes in physical state - boiling, evaporation and condensation

 Liquid which evaporates more quickly is ___________.

  1. spirit

  2. water

  3. grease

  4. oil
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Spirit is a volatile liquid which evaporates fastly than water and oil which have higher boiling point as compare to spirit. Grease is heavy, viscous oily material takes longer time to evaporate. Hence, spirit is the liquid which evaporates fastly. 

Multiple choice chemistry states of matter: boiling, evaporation and condensation atmospheric pressure and boiling point evaporation - factors and effects in daily life changes in physical state - boiling, evaporation and condensation

Evaporative cooling is the phenomenon  _____________.

  1. in which molecule of liquid with high kinetic energy evaporates fastly, leaving behind the particle of less kinetic energy

  2. in which molecule of liquid with low kinetic energy evaporates fastly, leaving behind the particle of high kinetic energy

  3. temperature change of the liquids

  4. none of these
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Evaporation is the surface phenomenon in which liquid molecules of high kinetic energy evaporates fastly from the surface of the liquid. Due to which the molecules of less kinetic energy remains in the solution and the temperature of the liquid decreases. Hence, it cools down. This phenomenon is known as evaporative cooling.

Multiple choice chemistry states of matter: boiling, evaporation and condensation atmospheric pressure and boiling point evaporation - factors and effects in daily life changes in physical state - boiling, evaporation and condensation

During evaporation of liquid,  ___________.

  1. the temperature of the liquid falls

  2. the temperature of the liquid rises

  3. the temperature of the liquid remains unchanged

  4. none of the above
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

When liquid gets evaporated from the surface of liquid they convert from liquid state to gaseous state by absorbing energy from the liquid and due to it temperature of the liquid decreases.

Multiple choice chemistry states of matter: boiling, evaporation and condensation atmospheric pressure and boiling point evaporation - factors and effects in daily life changes in physical state - boiling, evaporation and condensation

Crystallisation technique is better than simple evaporation technique as __________.

  1. some solids are evaporated with solvent

  2. some solids decompose or some may get charred on heating to dryness

  3. some impurities may remain dissolved in the solution even after filtration, which on evaporation contaminate the solid

  4. both (B) and (C)
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Crystallisation technique for purification is better than evaporation because
1. The extent of purification in case of crystallisation technique is very high.
2. Does not require very high temperature conditions, there is no need to boil the solvent.
3. The technique does not require very high apparatus setup for performing the purification.
4. If the compound is soluble in one solvent & less soluble or insoluble in other solvents, crystallisation can be done by mixing of the two solvents only.

Multiple choice chemistry states of matter: boiling, evaporation and condensation atmospheric pressure and boiling point evaporation - factors and effects in daily life changes in physical state - boiling, evaporation and condensation

Water stored in earthen pots become cool in summer because:

  1. condensation

  2. evaporation

  3. precipitaion

  4. none
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The water kept in an earthen pot remain cool even in summer because earthen pot has many small holes. Water seeps out through them and evaporates from the surface of the pot. The energy needed for evaporation is taken from the water kept in the earthen pot. As a result, water kept in earthen pot become cool.

Multiple choice chemistry states of matter: boiling, evaporation and condensation atmospheric pressure and boiling point evaporation - factors and effects in daily life changes in physical state - boiling, evaporation and condensation

Drinking of hot tea from a saucer preferred to a cup, because:

  1. Surface area

  2. Material of the saucer

  3. Thermal conductivity

  4. Colour
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The surface area of milk poured in a saucer is more than that in the cup. The more the surface area, the more is the rate of evaporation which causes cooling. Therefore, the tea present in saucer becomes cool faster than in a cup.


Hence, option A is correct.