Tag: changes and their classification

Questions Related to changes and their classification

If the substance is expanded on melting, the melting point ______ when the pressure is increased.

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

  1. increases

  2. decreases

  3. remains same

  4. none of these

Show answer
Correct Option: A
Explanation:

If the substance is expanded on melting, the melting point increases when the pressure is increased, because in increased pressure substance try to be in a state where volume decreases.

Water in freezing form may break rocks into pieaces due to their property of:

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

  1. expansion on freezing

  2. contraction on freezing

  3. condensation

  4. none of these

Show answer
Correct Option: A
Explanation:

When water between rocks is freezing its volume increases due to which rock can break into pieces.

You are presented with three bottles $A, B, C$ each containing a different liquid. Bottles are labeled as follows:
Bottle $A$: ionic compound - Boiling point $30^{\circ}C$
Bottle $B$: molecular compound - Boiling point $29.2^{\circ}C$
Bottle $C$: molecular compound - Boiling point $67.1^{\circ}C$
Choose the correct statement.

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

  1. The compound most likely to be incorrectly identified is bottle $A$

  2. The substance in bottle $B$ has stronger intermolecular attractions

  3. The substance in bottle $C$ is highly volatile

  4. A pure aqueous solution of the compound in a bottle $B$ is a good conductor of electricity among the three

Show answer
Correct Option: A
Explanation:

Since ionic compound has the much higher boiling point than a molecular compound. This is due to stronger intermolecular attraction.

Hence Bottle A is incorrectly identified, it should not be an ionic compound.

A filler is a substance added to make a material less expensive, or for:

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

  1. Changing its acidity

  2. Changing its physical properties

  3. Reducing its chemical activity

  4. Increasing its anti-rusting power

Show answer
Correct Option: B
Explanation:

A filter is a substance added to make a material less expensive or for changing its physical properties.

Filter are added to alter and improve the physical and mechanical properties of plastics it does not affect the structure arrangement of substance.