Chemistry · Science General

States of Matter

2,682 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 water and air and their importance importance of oxygen is air present everywhere around us? air as a natural resource

Which of the following is incorrect regarding oxygen?

  1. Solid oxygen is blue.

  2. Oxygen gas is odorless.

  3. Oxygen is non-toxic.

  4. Liquid and solid oxygen are paramagnetic.
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Solid oxygen is a clear substance with a light sky-blue colour. Oxygen gas is a colourless gas without taste or odour. Oxygen toxicity is a condition that results from the harmful effects of breathing molecular oxygen $(O _2)$ at elevated partial pressures. This causes hyperoxia, an excess of oxygen in body tissues.

Something that is paramagnetic means that it is weakly attracted to the poles of a magnetic field but it itself does not retain any magnetic properties once it is beyond that magnetic field. Oxygen, no matter what its state, is paramagnetic.In solid and liquid oxygen, the magnetic effect is measurable but in a gas, the molecules of oxygen possess ample energy of motion to overcome the weak magnetic influence. 

Multiple choice chemistry changes around us can all changes be reversed? substances and objects classification of changes

The change of state of water from one form to another is :

  1. chemical change

  2. irreversible change

  3. reversible change

  4. state variation
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
The change of state in water is a physical change hence it is reversible. When water is heated it convert in vapours and when cooled till $0^o C$ it freezes to form ice. Water vapors on condensation converts into water.

Hence the option C is correct.
Multiple choice biology physical resources air as a natural resource types of chemical reactions chemical reactions

Air is an example of homogeneous mixture.

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
A homogeneous mixture is a solid, liquid, or gaseous mixture that has the same proportions of its components throughout any given sample. 
If we consider some region of air, the gases, their volumes present in one part of the region equal to another one part of same region. We aren't able to divide different gases present in air. 
The statement is true.
Multiple choice physics forces in fluids hydrometer and lactometer comparing density - relative density principle of floatation and its applications

A cube of ice has a iron piece frozen unside at.
The cube floats an a beakerfilled with water, when the ice melts then the level of water is beaker 

  1. remains same

  2. level decreases

  3. level increases

  4. first increase ans decrese
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

According to Archimedes' principle, the weight of the displaced water equals the weight of the ice and the iron. When the ice melts, the iron sinks and the water from the melted ice occupies a volume equal to its mass, resulting in no change in the total water level.

Multiple choice chemistry measurement and data processing and analysis spectroscopic identification of organic compounds materials science introduction superconducting metals and x-ray crystallography

When does a precipitate form?

  1. When something is insoluble in solution.

  2. When something is soluble in solution.

  3. When too much of a substance is added to solution.

  4. Whenever a solid is added to solution.

  5. Whenever liquid is added to a solution.
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

When too much of a substance is added to solution, a precipitate forms.
Also, when ionic product exceeds solubility product, the precipitation occurs.
In a supersaturated solution, the excess ions recombine to form solid which results in precipitation.

Multiple choice methods of purification of organic compounds methods of purification - organic compounds organic chemistry - some basic principles and techniques organic chemistry : some basic principles and techniques chemistry biochemical techniques

The best solvent for the crystallization of organic solid is in which:

  1. organic compound is highly soluble

  2. compound is soluble on warming
  3. compound is soluble at $90^{0}$

  4. compound is insoluble
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Generally speaking you need to take polar solvents for polar compound and nonpolar solvents for nonpolar compounds. Many times a mixture of solvents works better. Once you have this basic idea, crystallization is a skill developed over a period of time by trial and error process. Even after long experience you may not hit the right solvent in the first try.

Multiple choice biology structure of earth electricity from water energy hydro electricity hydro energy

As the water is released through control valves, _____ of water changed to ____ .

  1. Rotational energy, potential energy

  2. Kinetic energy, potential energy

  3. Potential energy, rotational energy

  4. Rotational energy, thermal energy
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

As the water is released through control valve, the potential energy of water changes to kinetic energy. As the water flows into reservoir from the catchment area, the kinetic energy of flowing water changes to potential energy.

Multiple choice physics heat - measurement application of various thermometric scales different types of thermometers measuring temperature introduction to temperature

People boil water as safe measure to drink because:

  1. Boiled water is tasty

  2. Boiled water is more powerful

  3. Heating water is fashionable

  4. Excessive heat kills the microorganisms present in the water
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

People boil water as safe measure to drink because excessive heating kills the microorganisms present in the water and becomes safe to drink it.

Multiple choice physics heat - measurement application of various thermometric scales different types of thermometers measuring temperature introduction to temperature

The most commonly used thermometric substance is

  1. water

  2. alcohol

  3. mercury

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

Mercury is the only one in liquid state at room temperature. It's used in thermometers because it has high coefficient of expansion. Hence, the slightest change in temperature is notable when it's used in a thermometer. It also has a high boiling point which makes it very suitable to measure higher temperatures, and it doesn't stick to glass.

Multiple choice physics heat - measurement application of various thermometric scales different types of thermometers measuring temperature introduction to temperature

Mercury is commonly used as a thermometric fluid rather than water because

  1. specific heat of mercury is less than water

  2. specific heat of mercury is more than water

  3. mercury has greater visibility than water

  4. density of mercury is more than the water
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
Mercury is commonly used as a thermometric fluid rather than water because mercury has greater visibility than water
Mercury has high melting and boiling points making it a liquid over a broad range of temperature.
Since it is a metal, it has a stable coefficient of expansion hence it expands uniformly and noticeably for a slight change of temperature.
Mercury is a non sticky viscous metal and hence it makes a clear meniscus, helpful in readings.
Mercury will not expand when it solidifies hence it doesn’t break the glass tube of the thermometer.
Multiple choice physics heat - measurement application of various thermometric scales different types of thermometers measuring temperature introduction to temperature

Compared to other liquids, why is mercury preferred as a barometric fluid?

  1. Height of mercury barometer is smaller so it is more convenient to handle

  2. Mercury does not stick to the glass surface of barometric tube

  3. Mercury shines so it is easier to take the observations

  4. Coefficient of expansion of mercury is less than other liquids
Reveal answer Fill a bubble to check yourself
A,B Correct answer
Multiple choice chemistry combustion extinguishing fire ways to control fire combustion, fuels and flame

When water is poured over burning wood, the fire goes off. This is because _________.

  1. temperature of wood decreases

  2. temperature of water goes up

  3. molecules of water reacts with oxygen present in the flame

  4. the flame vapourises
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Water, when poured over fire absorbs large amount of heat and hence the temperature of wood falls below the ignition temperature. Thus the fire goes off.

Multiple choice chemistry rain: where does it come from sources of water and water cycle availability and forms of water the water cycle

Evaporation is defined as:

  1. conversion of ice in water.

  2. conversion of water into water vapours.

  3. conversion of water vapours into the water.

  4. freezing of water into ice.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

When water is heated it absorbs energy and changes its state from liquid (water) to gas(water vapours). This process of converting water in vapours is known as vaporisation.