Types of Chemical Reactions

The reaction between $\mathrm{Zn}$ and ${\mathrm{H}}_2{\mathrm{SO}}_4$ is an example for _____ reaction.

${\mathrm{CO}}_2$ gas is passed through water under pressure. What type of reaction is it with respect to the nature of the reaction? 

Classify the following reaction into combination, displacement, decomposition and double decomposition.

$2{\mathrm{SO}}_2+{\mathrm{O}}_2\to 2{\mathrm{SO}}_3$

Classify the following reaction into combination, displacement, decomposition and double decomposition.

${\mathrm{AgNO}}_3+\mathrm{HCl}\to \mathrm{AgCl}+{\mathrm{HNO}}_3$

Classify the following reaction into combination, displacement, decomposition and double decomposition.
$2{\mathrm{NH}}_3\to {\mathrm{N}}_2+3{\mathrm{H}}_2$

Classify the following reaction into combination, displacement, decomposition and double decomposition.
${\mathrm{ZnCO}}_3\stackrel{∆}{\to }\mathrm{ZnO}+{\mathrm{CO}}_2$

Classify the following reaction into combination, displacement, decomposition and double decomposition.

$2\mathrm{NO}+{\mathrm{O}}_2\to 2{\mathrm{NO}}_2$

When ferrous sulphate undergoes thermal decomposition: 

Complete the following reaction, and then balance.

Barium chloride $+$ Sodium sulphate $\to \_\_\_\_\_ + \_\_\_\_\_$

Complete the following reaction, and then balance.

Lead nitrate $+$ potassium iodide $\to \_\_\_\_\_ + \_\_\_\_\_$

An element $\mathrm{X}$ reacts with a substance and another element is obtained as one of the products. What type of chemical reaction is it with respect to its nature?

Why are halides of silver stored in dark coloured bottles? 

Why are combination reactions generally exothermic?

Which halogen cannot replace any other halogen from their compounds?

Formation of ${\mathrm{NH}}_4\mathrm{Cl}$ from ${\mathrm{NH}}_3$ and $\mathrm{HCl}$ is a synthesis reaction. Comment on the statement.

What does the symbols $\text{'}\rightleftharpoons \text{'}$ and $\text{'}∆\text{'}$ indicate in a balanced chemical equation?

Write an Example of chemical reaction in which temperature decreases?

Identify$\text{'}\mathrm{x}\text{'}$, $\text{'}\mathrm{y}\text{'}$ and $\text{'}\mathrm{z}\text{'}$ in the following reaction:

$2{\mathrm{KClO}}_{3\left(\mathrm{x}\right)}\stackrel{\mathrm{y}}{\to }2{\mathrm{KCl}}_{\left(\mathrm{x}\right)}+{\mathrm{O}}_{2\left(\mathrm{z}\right)}$

Name the $\text{'}\mathrm{X}\text{'} \mathrm{and} \text{'}\mathrm{Y}\text{'}$.

Assertion:(A) A white washed wall develops a coating of calcium carbonate after a few days.

Reason:(R) Calcium oxide on the wall reacts slowly with carbon dioxide in the air.

Identify the endothermic reaction(s) among the following:

P). $6{\mathrm{CO}}_2+12{\mathrm{H}}_2\mathrm{O}\underset{\mathrm{Chlorophill}}{\overset{\mathrm{Sunlight}}{\to }}{\mathrm{C}}_6{\mathrm{H}}_{12}{\mathrm{O}}_6 +6{\mathrm{O}}_2+6{\mathrm{H}}_2\mathrm{O}$

Q). ${\mathrm{Na}}_2{\mathrm{CO}}_3+2\mathrm{HCl}\to \mathrm{NaCl}+{\mathrm{CO}}_2+{\mathrm{H}}_2\mathrm{O}$

R). ${\mathrm{C}}_6{\mathrm{H}}_{12}{\mathrm{O}}_6+{\mathrm{O}}_2\to 6{\mathrm{CO}}_2+6{\mathrm{H}}_2\mathrm{O}$

S). ${\mathrm{CaCO}}_3\to \mathrm{CaO}+{\mathrm{CO}}_2$