Steps for Balancing Chemical Equations

Q.

If the equilibrium constant for A ⇌ B + C is K_eq ⁽¹⁾ and that of B + C ⇌ P is K_eq ⁽²⁾, the equilibrium constant for A ⇌ P is

1. K_eq ⁽¹⁾ K_eq ⁽²⁾

2. K_eq ⁽²⁾ − K_eq ^(!)

3. K_eq ^(!) + K_eq ⁽²⁾

4. K_eq ⁽¹⁾ / K_eq ⁽²⁾

Q. Balance the following reactions:
$Cu+H_{2}S{O}_4\to CuS{O}_4+S{O}_2\uparrow +H_{2}O$

Q.

The variable coefficients a, b, c and d are considered for balancing the chemical equation.

The relation we get by balancing K in the following equation is:

1. a=c

2. a=3c

3. a=2c

4. 2a=c

Q.

Balance the equation

$\mathrm{Fe}+{\mathrm{H}}_2\mathrm{O}\rightleftharpoons {\mathrm{Fe}}_3{\mathrm{O}}_2+{\mathrm{H}}_2$

Q.

$3Fe+4H_{2}O\to F{e}_3{O}_4+y{H}_2$

The value of y in the equation is ___

Q. Balance the given chemical equation.
$Al\left(s\right)+CuC{l}_2\left(aq\right)\to AlC{l}_3\left(aq\right)+Cu\left(s\right)$

Q.

Consider the following reaction.
$CaC{O}_3$ + $H_{2}O$ + $C{O}_2$ $\to$ $Ca(HC{O}_3{)}_2$

$\begin{array}{cc}\text{Element}& \text{Number of atoms present}\end{array}$
$\begin{array}{ccc}& \text{Reactant side}& \text{Product side}\\ \text{Calcium}& 1& 1\\ \text{Carbon}& 2& \text{Y}\\ \text{Oxygen}& \text{X}& 6\\ \text{Hydrogen}& 2& 2\end{array}$
Recognise $X$ and $Y$. The value of $X+Y$ is___.

Q.

Translate the following statements into chemical equations and then balance them.

(A) Hydrogen gas combines with nitrogen to form ammonia

(B) Hydrogen sulphide gas burns in air to give water and sulphur dioxide.

(C) Barium chloride reacts with aluminium sulphate to give aluminium chloride and a precipitate of barium sulphate.

Q.

For balancing the number of carbon atoms in the the below equation, the value of Z should be:

1. 4

2. 3

3. 2

4. 1

Q.

For the above balanced equation, ratio of a:c:b should be:

1. 1:2:3

2. 3:2:1

3. 2:3:1

4. 2:1:3

Q.

On balancing the given equation, a, b, c and d respectively would be $aF{e}_2{O}_3+b{H}_2\to cFe+d{H}_{2}O$

1. 1, 1, 2, 3

2. 1, 1, 1, 1

3. 1, 3, 2, 3

4. 1, 2, 2, 3

Q.

The balancing of compound is started with the element having most number of atoms.True/False.

1. True

2. False

Q. Find the value of a, b, c, and d in accordance with the law of conservation of mass for the reaction given below.
$aM{g}_3{N}_2+b{H}_{2}O\to cMg(OH{)}_2+dN{H}_3$

1. a, b, c and d are 2, 6, 3 and 2 respectively.
2. a, b, c and d are 1, 6, 3 and 2 respectively.
3. a, b, c and d are 1, 6, 2 and 3 respectively.
4. a, b, c and d are 1, 3, 4 and 2 respectively.

Q. In the following chemical reactions, identify X and Y.
$H_{2}S+C{l}_2\to 2HCl+X$
2Pb$(N{O}_3{)}_2\to 2PbO+4N{O}_2+Y$

1. X = $O_2$; Y = S
2. X = $H_2$; Y = $N_2$
3. X = S; Y = $O_2$
4. X = $C{l}_2$; Y = $O_2$

Q. Classify the following reaction:
$CuB{r}_{2\left(aq\right)}+2NaO{H}_{\left(aq\right)}\to Cu(OH{)}_{2\left(s\right)}+2NaB{r}_{\left(aq\right)}$

1. Acid-Base Neutralization reaction.
2. Synthesis reaction.
3. Precipitation reaction.
4. Redox reaction.

Q.

The chemical equation doesn't change if all its coefficients are multiplied by a common natural number.

1. True

2. False

Q.

The variable coefficients d, e, f and g are considered for balancing the chemical equation. Relationships between these variable are constructed by balancing the atoms of each element on either side of the reaction. Which of the following are correct?

(Note: Coefficients should be natural numbers.)

(i) 2d= f, d = 3g and e= f + 2g

(ii) 2d = f, 3d = g and 2e = 2f + g

(iii) d = f2, 2d = g and e = 2f + 2g

(iv)d = 1, e = 3.5, f = 4 and g = 6

(v) d = 2, e = 7, f = 4 and g = 6

(vi) d = 2, e = 7, f = 3 and g = 4

1. (v), (iii)

2. (vi), (i)

3. (ii), (v)

4. (ii), (iv)

Q.

Fill in the blank with a number which balances the following reaction.

$3Fe+4H_{2}O\to F{e}_3{O}_4+y{H}_2$

Then, y = ___

Q.

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

1. (s)

2. (aq)

3. (l)

4. (sol)

Q.

The variable coefficients d, e, f and g are considered for balancing the chemical equation.

The relation we get by balancing the element H in the following equation is ____.

1. e=f

2. 3d=g

3. d=g

4. d=2h

Q.

In an experiment, sodium hydroxide solution reacts with hydrochloric acid solution to produce sodium chloride solution and water. Which of the following correctly represents the balanced equation (with physical states) for this experiment?

1. NaOH (aq) + HCl (l) → NaCl (aq) + (l)

2. NaOH (aq) + HCl (aq) → NaCl (aq) + (l)

3. NaOH (aq) + HCl (aq) → NaCl (aq) + (aq)

4. NaOH (aq) + HCl (l) → NaCl (aq) + (aq)