Chemistry · Science General

States of Matter

2,382 Questions

States of matter questions explore physical changes, evaporation, phase transitions, and the properties of liquids and gases. Topics cover density, cryosurgery, heavy water, and electrolytes. This foundational chemistry topic frequently appears in general science sections of SSC and railway exams.

Phase change mechanismsEvaporation and temperature effectsProperties of liquidsPhysical versus chemical changesElectrolytes and heavy water

States of Matter Questions

Multiple choice evs experiments with water water and its types hard and soft water what floats - what sinks

Hard water can be softened in ?

  1. A chromatograph

  2. An ion exchanger

  3. A calorimeter

  4. An earthenware pot
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Answer:- (B) An ion exchanger

Explanation:-
In ion exchanger, the hard water is softened because it no longer contains calcium or magnesium ions. Ion exchange units that replaces calcium and magnesium ions from water are known as water softeners.

Multiple choice evs experiments with water water and its types hard and soft water what floats - what sinks
Water which doesn't give lather immediately with soap is called soft water.

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
Soaps are basically sodium salt of fatty acids. 

In the presence of excess calcium and magnesium ions in water, the sodium ions are replaced by these ions and are precipitated as scum. 

Water containing an excess of these (calcium and magnesium) ions is called hard water.

Therefore option $B$ is correct.
Multiple choice evs experiments with water water and its types hard and soft water what floats - what sinks

Temporary hardness can be removed by:

  1. boiling

  2. clark's process

  3. calgon's process

  4. permutit method
Reveal answer Fill a bubble to check yourself
A,B Correct answer
Explanation

By boiling : - On boiling, soluble $Mg{ \left( HC{ O } _{ 3 } \right)  } _{ 2 }$ is converted to insoluble $Mg{ \left( OH \right)  } _{ 2 }$ and $Ca{ \left( H{ CO } _{ 3 } \right)  } _{ 2 }$ to insoluble ${ CaCO } _{ 3 }$. It is because high solubility of $Mg{ \left( OH \right)  } _{ 2 }$ as compared to $Mg{ CO } _{ 3 }$, than $Mg{ \left( OH \right)  } _{ 2 }$ is precipitated. Precipitates can be removed by filtration.


By Clark's Method : Calculated amount of lime is added to hard water $\rightarrow Ca{ CO } _{ 3 }$ precipitates out & $Mg{ \left( OH \right)  } _{ 2 }$ can be filtered off.

Multiple choice evs experiments with water water and its types hard and soft water what floats - what sinks

Water is liquid at room temperature, the most important reason for this is the :

  1. high boiling point of water

  2. high melting point of water

  3. high heat of vapourization of water

  4. cohesive forces due to hydrogen bonds in water
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Water is liquid at room temperature, the most important reason for this is the cohesive forces due to hydrogen bonds in water.

Multiple choice evs experiments with water water and its types hard and soft water what floats - what sinks

Which of the following is true?

  1. Vegetable oil is heavier than water

  2. Ghee is soluble in water

  3. Curd is soluble in water

  4. A person who can not swim will not drown in dead sea
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The salt is all dissolved in the water, this makes all of the water much denser than normal water, making it uncomfortable to swim in. Furthermore it means that the water is denser than the human body which is 70%, unsalted water. Meaning it is impossible to sink in the Dead Sea.

Multiple choice chemistry nuclear physics nuclear reactor the nuclear power station isotopes and nuclear chemistry

Heavy water is:

  1. compound of deutrium and oxygen
  2. water at $4 ^\circ C$

  3. water, in which soap does not lather

  4. compound of heavy oxygen and heavy hydrogen
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Heavy water is water that contains heavy hydrogen or deuterium. Deuterium differs from the hydrogen usually found in water, protium, in that each atom of deuterium contains a proton and a neutron. Heavy water may be deuterium oxide,$D _2O$ or it may be deuterium protium oxide, $DHO$. Heavy water occurs naturally, although it is much less common than regular water. 

Multiple choice principal and molar specific heats of gases isothermal and adiabatic processes specific heat capacity heat and thermodynamics physics

If water at ${ 0 }^{ \circ  }C.$kept in a container with an open top , is placed in a large evacuated chamber- 

  1. All the water will sported

  2. All the water will French .

  3. Part of the water will vaporize will be formed and reached . equilibrium at the triple point.

  4. ice , water and vapour will be formed and reach equilibrium at the triple points .
Reveal answer Fill a bubble to check yourself
D Correct answer
Multiple choice chemistry metals physical properties of metals and non-metals some physical properties of metals general characteristics and uses of metals

The concentration of matter in a material is:

  1. volume

  2. mass

  3. density

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

For a pure chemical, the mass concentration is equal to its density (mass divided by volume); thus the mass concentration of a component in a mixture can be called density of a component in a mixture.

Multiple choice chemistry composition of matter physical properties of non-metals uses of metals and non metals physical properties of metals and non-metals

Compare metals and non-metals with particular emphasis on solubility:

  1. Both dissolve in solvent

  2. None of them dissolve in solvent

  3. Metal dissolve while non-metal do not dissolve in solvent

  4. Non-metal dissolve while metal do not dissolve in solvent
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation
MetalsThey do not dissolve in solvents except by chemical action. Non-metalsThey dissolve in solvents and can be re-obtained by evaporation. Example: sulphur in carbon disulphide.
Multiple choice chemistry composition of matter physical properties of non-metals uses of metals and non metals physical properties of metals and non-metals

The non-metal which is liquid at room temperature is:

  1. chlorine

  2. fluorine

  3. bromine

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

Bromine is the only non-metal which is liquid and diatomic molecule at room temperature. 

It is a dense, reddish-brown liquid evaporating at standard temperature and pressure to give an orange vapour. It is one of the only two elements on the periodic table that are liquids at room temperature other than mercury.

Hence, option $C$ is correct.