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 metallic and electrolytic conduction electrolysis chemical reactions electrochemistry chemistry

We can expect that pure water:

  1. will not normally conduct electricity

  2. will normally conduct electricity

  3. slightly conduct electricity

  4. completely conduct electricity
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Water has very low ionisation constant so it dissociates very low and pure water  consists almost entirely of molecules; as no of ions are very less in pure water so normally it will not conduct electricity.

Multiple choice metallic and electrolytic conduction electrolysis chemical reactions electrochemistry chemistry

With rise in temperature, electrolytic conductance :

  1. increases

  2. decreases

  3. disappear

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

Generally the conductivity of a solution increases with temperature, as the mobility of the ions increases.
Conductivity (or specific conductance) of an electrolyte solution is a measure of its ability to conduct electricity.
Electrolytic conductance generally increases with rise in temperature.

Multiple choice physics pressure in fluids and atmospheric pressure pressure in air introduction to atmospheric pressure pressure exerted by air devices to measure pressure

The boiling point of a liquid can be raised by

  1. Increasing pressure

  2. Decreasing pressure

  3. Increasing the heat supply

  4. Increasing the quantity of the liquid
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

When water heats up the molecules move faster and faster and move farther apart, eventually becoming steam. When the pressure on the water is increased,  the molecules are more tightly held. This helps keep them from moving apart so it requires more heat to get them to "break free" and move apart. So, the higher the water pressure the higher the boiling point. 

Multiple choice physics pressure in fluids and atmospheric pressure pressure in air introduction to atmospheric pressure pressure exerted by air devices to measure pressure

When the pressure of water is increased, the boiling temperature of water as compared to $100^oC$ will be :

  1. lower

  2. the same

  3. higher

  4. on the critical temperature
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

(C)

The boiling point are the conditions of temperature and pressure, when the vapour pressure of the boiling liquid is EQUAL to the ambient pressure, and bubbles of vapour form directly in the liquid. 
On increasing the pressure water has to be elevated much higher temperature for its pressure to be equal to net applied pressure on it and therefore the water will boil at higher temprature

Multiple choice physics electric current and its effects thermal effect of electric current heating effect of electric current effect of electric current

Choose the incorrect option: Expansion during heating:

  1. occurs only in a solid

  2. increases the density of the material

  3. decreases the density of the material

  4. occurs at the same rate for all liquids and gaseous.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
$A)$ The incorrect sentence is option $A$ because expansion during heating occurs in all kinds of substance. Solid, liquid, and gas expanse when heated. The reason is this, all materials, as you know, are made up of atoms. The kinetic enery of the materials and their atoms move or vibrate more at any temperature above absolute $0$ ($-273$ degree celsius). Thus the atoms take up more space upon heating and the material expands.
The other options are true.
$B)$ A hot material is heavier than the cold one. So it is true.
$C)$ During heating, the molecules expand and they create more distance between them. Thus heating decreases the density of the material.
$D)$ This option is also quite wrong because not all solids and liquids (or gas, per say) expand at the same rate. The reason is this, at same temperature, solid expands the lesser than liquid, and gasses the most.
Multiple choice biology living in harmony climate factors abiotic components organisms and environment

Which of the following is not a property of water?

  1. It becomes more dense when it freezes.

  2. It dissolves molecules in the air.

  3. It absorbs heat when the hydrogen bonds break.

  4. It forms hydrogen bonds with other water molecules to create surface tension.

  5. It form hydrogen bonds with other molecules by adhesion.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
A. When water freezes, it is converted into ice. Ice has a cage like structure and thus, its density is less than water. Hence, water becomes less dense when it freezes.
B. Water is a polar solvent and thus, many gases are soluble in water. Hence, it dissolves molecules in the air.
C. Water has high energy hydrogen bonds. When these bonds break, heat is released which is absorbed by the water due to its high specific heat capacity.
D. Surface tension is interaction between water molecules which results due to formation of hydrogen bonds between water molecules.
E. Adhesion is the force of attraction between different molecules. Water can form hydrogen bonds with other molecules and this is called adhesion.
Hence, statement A is incorrect.
So, the correct answer is 'It becomes more dense when it freezes'.
Multiple choice chemistry principles of metallurgy concentration of ore concentration of ores general principles of metallurgy

The substance added in water in the froth floatation process is

  1. Olive oil

  2. Pine oil

  3. Coconut oil

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

Froth floatation process: This process is best suitable for sulphide ores. It is based on different wetting characteristics of the ore and gangue particles with water and pine oil. The ore is wetted by oil and impurities are wetted by water. Ore particles are adsorbed on potassium or sodium ethyl xanthate (as collector) and come at the surface along with the froth. Froth stabiliser (cresols, aniline) stabilises the froth.

Multiple choice geography exogenic processes part-2 the soil soil erosion (geo) soil erosion, soil conservation and uses of soil

A small coloured paper pellet is put in a beaker half-filled with water.
The beaker is placed on a tripod stand and heated.
As the water warms, the pellet moves upwards with the warm column of water and sinks back along the cool column of water.
Identify this movement:

  1. Molten magma inside the earth

  2. earth's magma inside the earth

  3. Energy flow from one trophic level to another

  4. Hydrological cycle
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The water cycle also known as the hydrological cycle describes the continues movement of water on, above and below the surface of the earth. Although the balance of water on Earth remains fairly constant over time, individual water molecules can come and go, in and out of the atmosphere. In doing so, the water goes through different phase liquid, solid (ice) and gas (vapor).

Multiple choice chemistry chemistry in daily life antimicrobials and antifertility drugs therapeutic action of different classes of drugs drugs and their classification

Chlorine in the concentration of 0.2 to 0.4 ppm in aqueous solution, mixed with sulphur dioxide in very low concentrations, form _______.

  1. disinfectants

  2. antibiotics

  3. antiseptics

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

Antiseptics acts as disinfectants at low concentration of solution.

Chlorine in concentration of $0.2$ to $0.4$ $ppm$ in aqueous solution, mixed with $SO _2$ at low concentration is a disinfectant.