Hit and Trial for Balancing

Q.

Write the complete balanced equation of $\mathrm{CuO}+{\mathrm{NH}}_3\to \mathrm{Cu}+{\mathrm{N}}_2+{\mathrm{H}}_2\mathrm{O}$ .

Q.

Balance the equation:- ${\mathrm{Mg}}_3{\mathrm{N}}_2+{\mathrm{H}}_2\mathrm{O}\to \mathrm{Mg}{\left(\mathrm{OH}\right)}_2+{\mathrm{NH}}_3$

Q.

Write a balanced chemical equation for heating potassium nitrate to produce potassium nitrite and oxygen.

Q.

Balance the equation

$\mathrm{Fe}+{\mathrm{O}}_2\to \mathrm{FeO}$

Q.

Write three balanced equations for the purification of bauxite by Halls process.

Q.

Give a balanced equation for the following conversation

(B). Iron to tri-iron tetroxide using steam.

Q. Estimate the value $x$ to balance the given equation.

$M{g}_3{N}_2\left(aq\right)+x{H}_{2}O\left(l\right)\to 3Mg\left(OH{)}_2\right(aq)+2N{H}_3(g)$

1. 6

Q. Analyse the reaction given below:

${\text{CaCO}}_3\text{(aq)}$ + ${\text{H}}_2\text{O}\text{(aq)}$ + ${\text{CO}}_2\text{(g)}$ $\to$ ${\text{Ca(HCO}}_3{)}_2\text{(aq)}$

If X is the total number of oxygen atoms and Y is the total number of carbon atoms present in the chemical reaction after balancing, then determine X + Y.

1. 9
2. 12
3. 16
4. 8

Q. What is a chemical equation? Why is it necessary to balance it ? [2 Marks]

Q. Estimate the value $x$ to balance the given equation.

$M{g}_3{N}_2\left(aq\right)+x{H}_{2}O\left(l\right)\to 3Mg\left(OH{)}_2\right(aq)+2N{H}_3(g)$

1. 2
2. 4
3. 6
4. 8

Q.

Complete the following reaction

$\mathrm{Zn}{\left(\mathrm{OH}\right)}_2+{\left({\mathrm{NH}}_4\right)}_2{\mathrm{SO}}_4+{\mathrm{NH}}_4\mathrm{OH}\to ............+{\mathrm{H}}_2\mathrm{O}$

Q. Identify the reactants in the following reaction.

$\text{KOH(aq)}+{\text{HNO}}_3\text{(aq)}\to {\text{H}}_2\text{O(l)}+{\text{KNO}}_3\text{(aq)}$

1. ${\text{H}}_2\text{O}$, ${\text{KNO}}_3$
2. ${\text{HNO}}_3$, ${\text{H}}_2\text{O}$
3. ${\text{KNO}}_3$, $\text{KOH}$
4. $\text{KOH}$, ${\text{HNO}}_3$

Q.

Balance the equation: $\mathrm{Mg}+{\mathrm{O}}_2\to \mathrm{MgO}$