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 p- block elements-ii anomalous properties of nitrogen nitrogen - 15 group group 15 elements

Identify the true statement regarding nitrates of all metals.

  1. All nitrates decompose to give $N{ O } _{ 2 }$

  2. All nitrates are soluble in water

  3. All nitrates are insoluble in water

  4. All nitrates are stable to heat
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Nitrates of divalent and trivalent metals (Mg, Ca, Ba, Pb, Cu, Zn, Hg, Al, Fe etc.) decompose on heating to give reddish brown fumes of nitrogen dioxide.

The nitrates, chlorates, and acetates of all metals are soluble in water.

Nitrates are not stable to heat they decompose to release nitrogen dioxide.


Multiple choice business organisation and correspondence industrial pollution and degradation of environment sources of pollution environmental conservation environment and conservation

Find the odd one out:

  1. Plastic

  2. Paper

  3. Charcoal

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

In the modern world, to save resources for the next generation it is very important to reuse the goods available. Plastic, paper and water are the easiest substances that could be reused rather than dumping them out.

Multiple choice properties of enzyme enzyme properties enzymes biomolecules: chemical constituents of living cells biology

At boiling temperature, an enzyme is

  1. Denatured

  2. Unaffected

  3. Inactivated

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

The activity of an enzyme can be affected by a change in the conditions which can alter the tertiary structure of the protein. These include temperature, pH, change in substrate concentration or binding of specific chemicals that regulate its activity. Enzymes generally function in a narrow range of temperature and pH. Each enzyme shows its highest activity at a particular temperature and pH called the optimum temperature and optimum pH. Activity declines both below and above the optimum value. Low temperature preserves the enzyme in a temporarily inactive state whereas high temperature destroys enzymatic activity because proteins are denatured by heat. At boiling temperature all proteins including enzymes are denatured.

Multiple choice properties of enzyme enzyme properties enzymes biomolecules: chemical constituents of living cells biology

As the water evaporates from the skin of a swimmer who has just left a pool, the swimmer begins to shiver and goose bumps form on his skin. As the blood vessels under his skin move more internally, the goose bumps that form and the shivering are reactions to counteract the lowering of body temperature. After the swimmer has dried off the shivering stops and his body temperature returns to normal. This is an example of

  1. Product inhibition

  2. Disequilibrium

  3. A negative feedback mechanism

  4. A positive feedback mechanism
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

When there is a drop in body temperature due to a drop in environmental temperature. The sensory receptors on the skin sends signal to the hypothalamus, which increases the body temperature by causing vasoconstriction and prevents blood from flowing closer to the skin, this also causes piloerection or goosebumps, this is to conserve energy and raise the body temperature. Once the swimmer has dried himself  the thermosensors of the skin send a feed back of temperature returning to normal to the hypothalamus and the shivering is stopped. This is called negative feedback mechanism.

So, the correct answer is 'A negative feedback mechanism'

Multiple choice chemistry elements and compounds alloys and their properties metals, alloys and crystals chemical bonding and structure

Consider the following statements:
(a) Mass is not affected by temperature and pressure.
(b) Plasma contains ionised gases.
(c) Alloys are homogenous mixtures.
(d) Solution is a heterogeneous mixture.
Which of the above statements are correct?

  1. (a), (b) and (c)

  2. (b) and (c)

  3. (a), (c) and (d)

  4. (a) and (d)
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

a. An increasing or decreasing temperature doesn't affect mass. Mass is the amount of matter in an object whereas temperature is the human sense of kinetic energy of matter. Thermal energy is very, very, very small, so no, it is not measurable as mass.

b. Plasma is the fourth state of matter. Plasma is an ionized gas, a gas into which sufficient energy is provided to free electrons from atoms or molecules and to allow both species, ions and electrons, to coexist.

c. An alloy is a homogeneous mixture of 2 or more metals or metal with 2 or more semi-metals.

d. It is homogeneous because the additions take place in the liquid state, so the atoms mingle with each other and mix thoroughly.

Multiple choice chemistry p- block elements-ii group 17 elements - general properties group 17 elements group 17 elements - properties

Which of the following is correct?

  1. Iodine is solid

  2. Chlorine is insoluble in water.

  3. Iodine is more reactive than bromine.

  4. Bromine is more reactive than chlorine.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The reason is that the attractive forces between the molecules of these elements increase from top to bottom of the Group.

In iodine, the electrons are so far from the nuclei that the electron clouds can easily distort. The London dispersion forces are strong. So the Iodine is solid.

Hence option A is correct.

Multiple choice chemistry change around us physical changes changes and their classification physical changes

Physical changes are ________.

  1. Temporary

  2. Permanent

  3. Irreversible

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

In a physical change, the substances are not altered chemically. No new products are formed. 
A physical change can affect the size, shape or color of a substance but does not affect its composition. The substances may be changed to another phase (i.e. gas, liquid, solid) or separated or combined so physical changes are temporary.

Examples:
when ice melts
when sulfur is mixed with iron filings. 
breaking a glass 
dissolving sugar in water

Multiple choice chemistry change around us physical changes changes and their classification physical changes

The process in which the state of a substance changes from solid to liquid is called:

  1. boiling

  2. condensation

  3. freezing

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

When a solid is heated, the particles are given more energy and start to vibrate faster. At a certain temperature, the particles vibrate so much that their ordered structure breaks down. At this point the solid melts into liquid. This temperature change from solid to liquid is called  the melting point. Each solid has a set melting point at normal air pressure, but at higher altitudes the melting point lowers.

Multiple choice chemistry change around us physical changes changes and their classification physical changes

On decreasing temperature, a liquid turns into solid. This is:

  1. condensation

  2. melting

  3. freezing

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

On decreasing temperature, a liquid turns in to solid, this process is called Freezing. Freezing or solidification is a phase transition state.
Most liquids freeze by crystallization. formation of crystalline solid from the uniform liquid. this is a first-order thermodynamic phase transition i.e as long as solid and liquid coexist the temperature of the whole system remains very nearly equal to the melting point due to slow removal of heat when in contact with the air, which is a poor heat conductor.

Multiple choice chemistry change around us physical changes changes and their classification physical changes

When a solid directly turns into gaseous state, it is called:

  1. sublimation

  2. condensation

  3. polymerisation

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

Sublimation is the transition of a substance directly from the solid to the gas phase without passing through the intermediate liquid phase. Sublimation is an endothermic phase transition that occurs at temperatures and pressures below a substance's triple point in its phase diagram. The reverse process of sublimation is desublimation or deposition.