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 chemistry chemical thermodynamics system and surroundings introduction to thermodynamics basics of thermodynamics

Select the correct statements.

  1. State of a system is assumed to be in internal equilibrium and the temperature and pressure are uniform throughout the system.

  2. Thermal drift in a system with time is more in Dewar flask than in insulated system.

  3. Thermal drift in a system with time is more in non-insulated system than in insulated system.

  4. Thermal drift in a system with time is more in insulated system than in non-insulated system.
Reveal answer Fill a bubble to check yourself
A,C Correct answer
Multiple choice evs eat when you need food poisoning and food preservation methods food spoilage, adulteration and preservation food spoilage and adulteration

Pasteurisation is?

  1. Heating of liquid at $65^o$C
  2. Heating of liquid between $65^o$ - $80^o$C followed by rapid cooling
  3. Heating of solids at $65^o$C

  4. None of these
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Pasteurization is a process in which milk is heated at high temperatures (65 degree celsius approx) followed by rapid cooling to kill pathogenic bacteria.

Correct answer-B

Multiple choice nuclear reactions nuclear structure nuclei atomic nuclei physics

If mass-energy equivalence is taken into account, when water is cooled to form ice, the mass of water should

  1. increase

  2. remain unchanged

  3. decrease

  4. first increase then decrease
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Because thermal energy decreases, therefore mass should increase.

Multiple choice nuclear reactions nuclear structure nuclei atomic nuclei physics

If mass-energy equvalence is taken into account, when water is cooled to form ice, the mass of ater should

  1. Increase

  2. Remain unchanged

  3. decrease

  4. First increase and then decrease
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

As we know that when water is converted into ice then it releases 

energy to the atmosphere, in other words, it can be said that
 it releases some mass to the atmosphere because mass and 
energy are equivalent. 
So option C is correct that mass will decrease.

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

A sample of water which starts lathering with soap solution on boiling is called temporary hard water.

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

A temporary hard water can from lather with soap. The ${ Ca }^{ 2+ }/{ Mg }^{ 2+ }$ ions of water displace ${ Na }^{ + }$ or ${ K }^{ + }$ ions from this salts & form insoluble $Ca/Mg$ salts of fatty acids. 

$\because $ it is temporary hard water, lathering of soap is not that difficult.

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

.................. water does not lather with soap

  1. Hard water

  2. Soft water

  3. Contaminated water

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

Hard water does not lather with but instead forms a gooey mass called scum. Hard water is formed when water percolates through deposits of limestone and chalk which are largely made up of calcium and magnesium carbonates.

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

If a boiled and filtered hard water is added to soap and it lathers, the water is :

  1. temporary hard water

  2. permanent hard water

  3. both a and b

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

Hardness of water can be of two types temporary and permanent hardness. Temporary hard water contains only bicarbonates of magnesium and calcium. It can be removed by boiling. Such water on treating with soap lathers easily.

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

Types of hardness of water is :

  1. temporary and semi-permanent

  2. permanent and temporary

  3. permanent and partially permanent

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

Hardness of water can be of two types temporary and permanent hardness. Temporary hard water contains only bicarbonates of magnesium and calcium. It can be removed by boiling. Permanent hard water contains chlorides and sulfates of calcium and magnesium. It can be removed by adding washing soda.

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

The given sample of lathers easily with water, it is :

  1. hard water.

  2. soft water.

  3. permanent hard water.

  4. temporary hard water.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Soft water is surface water that contains low concentrations of ions and in particular is low in ions of calcium and magnesium. Because soft water has few calcium ions, there is no inhibition of the action of soaps and no soap scum is formed in normal washing. It lathers easily with water. Similarly, soft water produces no calcium deposits in water heating systems.

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

A cloudy or milky appearance characterizes :

  1. soft water

  2. hard water

  3. chlorinated water

  4. both a and c
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

An easy way in which water manifests its hardness is scaling i.e. forming deposits through calcification that clog plumbing. These scales are usually white because calcium and magnesium are the most common sources of hardness in water. In swimming pools, a cloudy or milky appearance characterizes hard water.