Reaction Conditions

Q.

Which of the following reactions is an endothermic reaction?

1. Burning of coal.

2. Decomposition of vegetable matter into compost.

3. Process of respiration.

4. Decomposition of calcium carbonate to form quick lime and carbon dioxide.

Q. The conversion of calcium carbonate into calcium oxide is an example of decomposition reaction

1. Thermal
2. Photolytic
3. Electrolytic

Q. The total number of products formed by thermal decomposition of ${\mathrm{FeSO}}_4$ are :

1. 3

Q.

Name two important products of destructive distillation of coal. Name the residue left in this process. Give one main use of this residue.

Q.

Coke is a good conductor of heat and electricity.

1. True
2. False

Q.

Iron and sulphur when ___ together react to produce iron sulphide.

Q.

Give reason.

Apparatus for laboratory preparation of hydrogen should be air-tight and away from a naked flame.

Q.

Name the various products obtained by destructive distillation of wood.

Q.

Mixing the reactants cause a chemical reaction to happen.

1. False

2. True

Q.

Why is sodium stored in kerosene oil?

1. To make sodium smell like kerosene

2. To make sodium react with kerosene

3. To prevent the contact of sodium with moisture.

4. Simply

Q.

What do you understand by the term exothermic reaction.

Q.

Give one example of an exothermic reaction.

Q.

Hydrogen liquifies into a colorless liquid at a temperature of

1. -150⁰C

2. -200⁰C

3. -240⁰C

4. -230⁰C

Q.

Calcium carbonate decomposes when heated at about ________________.

Q.

Perform an activity to show decomposition reaction of calcium carbonate.

Q. The process of dissolving an acid or a base in water is a/an __________ reaction.

1. exothermic
2. reduction
3. oxidation
4. endothermic

Q.

Which of the following names represent the foul-smelling, black, thick, viscous liquid obtained from destructive distillation of coal?

1. Coke

2. Coal tar

3. Coal gas

4. None of these

Q.

EXPLAIN REARRANGEMENT OF ATOMS IN A CHEMICAL CHANGE WITH EXAMPLE ?

Q.

Which of these chemical equations is not balanced?

1. $2\text{Mg (s)}+{\text{O}}_2\text{(g)}\to 2\text{MgO (s)}$

2. ${\text{CO}}_2\text{(g)}+6{\text{H}}_2\text{O (l)}\to {\text{C}}_6{\text{H}}_{12}{\text{O}}_6\text{(s)}+6{\text{O}}_2\text{(g)}$

3. ${\text{CuCl}}_2\text{(aq)}+{\text{Pb (NO}}_3{)}_2\text{(aq)}\to {\text{Cu(NO}}_3{)}_2\text{(aq)}+{\text{PbCl}}_2\text{(g)}$

4. ${\text{CaCO}}_3\text{(s)}\to \text{CaO (s)}+{\text{CO}}_2\text{(g)}$

Q.

The physical state of salt that dissolves in water and forms solution is:

1. (s)

2. (aq)

3. (l)

4. (sol)

Q.

Raghu while performing experiments found that the speed of the chemical reaction increases as the surface area of the reactant is increased. Why is it happening so?

1. This change increases the density of the reactant particles.
2. This change exposes more reactant particles to possible collisions.
3. This change alters the electrical conductivity of the reactant particle.
4. This change increases the concentration of the reactant.

Q. is a substance added to improve the performance of a solid catalyst in a chemical reaction.

1. Collector
2. Promoter
3. Stabiliser

Q. The hydrolysis of water is a type of

1. double displacement reaction
2. decomposition reaction
3. combination reaction
4. displacement reaction