Balancing Chemical Equations by Hit and Trial Method

Q.

27. Complete and balance the following equation:-

1. ${\mathrm{H}}_2+{\mathrm{Cl}}_2\to$

Q.

The given equation represents the reaction of sodium metal with water.

Sodium + Water → Sodium hydroxide + Hydrogen

Which of the following chemical equations represents a complete balanced chemical equation for the given word equation?

1. 

2. 

3. 

4. 

Q.

Balance the following equation b hit and trial method :. NH4Cl + Ca(OH)2 ------------> CaCl2 + H2O + NH3

Q.

Write the formulae and balance the equation

Lead dioxide + Hydrochloric acid $\to$ Lead chloride + Water + Chlorine

Q. In balanced chemical equation number of atoms of reactant side is ________ number of atoms of product side.

1. greater than
2. lower than
3. equal to
4. always greater than

Q. How to balance chemical equations . Please give some examples.

Q.

Write the equation to represent the reaction of sodium hydroxide (ii) with Carbon dioxide

Q.

Write a fully balanced equation for each of the following cases.
Red lead is warmed with concentrated hydrochloric acid.

Q.

Barium chloride reacts with sodium sulphate to produce barium sulphate and sodium

Which of the following chemical equations represents a complete balanced chemical equation for the given process?

1. 

2. 

3. 

4. 

Q.

What is the balanced form of the equation written below?

$Cu+H_{2}S{O}_4\to CuS{O}_4+S{O}_2+H_{2}O$

1. $Cu+3H_{2}S{O}_4\to CuS{O}_4+S{O}_2+H_{2}O$

2. $2Cu+H_{2}S{O}_4\to 2CuS{O}_4+S{O}_2+H_{2}O$

3. $Cu+2H_{2}S{O}_4\to CuS{O}_4+S{O}_2+H_{2}O$

4. $Cu+4H_{2}S{O}_4\to CuS{O}_4+S{O}_2+H_{2}O$

Q.

What should be the number of atoms of Tin in the balanced form of the equation below?

$A{s}_2{O}_3+SnC{l}_2+HCl\to SnC{l}_4+As+H_{2}O$

1. 3

2. 2

3. 6

4. 1

Q.

What influence does an increase in reactant concentration have on the system which is in equilibrium?

1. Equilibrium will shift to increase the product concentration.

2. A forward reaction will be favoured.

3. A backward reaction will be favoured.

4. Equilibrium will shift to decrease the reactant concentration.

Q.

Which of the following is correct about the balanced equations?

1. Both A and B are correct

2. Molecules are conserved

3. Atoms are conserved

4. Mass is conserved

Q.

For the following reaction identify the products formed and balance the equation.

MnO₂ + HCl ⇢?

Q.

Balance the following chemical equation by replacing a, b, c, d and electric with appropriate natural numbers.

aS + bHNO₃ 🔜cH₂SO₄ + dNO₂ + eH₂O

Write the sum of a, b, c, d and e

Q.

Which theory has provided an explanation for the law of conservation of mass and the law of definite proportions?

1. Dalton's atomic theory

2. Lavoisier's theory

3. J.J Thomson's atomic theory

4. Democritus atomic theory

Q. Which of the following equation is balanced?​

1. $O_2+{\mathrm{NO}}_2+2H_{2}O\to 4{\mathrm{HNO}}_3$
2. $\mathrm{Zn}+2\mathrm{HCl}\to {\mathrm{ZnCl}}_2+H_2$
3. $O_2+2{\mathrm{SO}}_2+2H_{2}O\to H_2{\mathrm{SO}}_4$
4. $H_2+{\mathrm{Cl}}_2\to \mathrm{HCl}$

Q.

Fill in the blank space and then balance the chemical equations.

___________ + dil.HCl $\to$MgCl₂ + _______

Q.

Complete the reaction below and balance it.

$\mathrm{PbO}+\mathrm{HCl}\to$

Q. 5 g of X reacts with 6 g of Y to form a new product Z.
$X+Y\to \mathrm{Z.}$The mass of the product Z formed is g.

1. 13
2. 11
3. 6

Q. What will be the values of the coefficients x, y and z if the given reaction is balanced?

${\text{xFeCl}}_3+\text{yMgO}\to {\text{Fe}}_{\text{2}}{\text{O}}_3+{\text{zMgCl}}_2$

1. x = 2, y = 3, z = 3
2. x = 2, y = 4, z = 3
3. x = 3, y = 2, z = 2
4. x = 3, y = 2, z = 3

Q. A balanced chemical equation is in accordance with _________.

1. Avogadros law
2. law of conservation of mass
3. law of constant proportion
4. law of multiple proportion

Q. Law of constant proportion states that a chemical compound always contains the same elements combined in a fixed proportion by mass.

1. False
2. True

Q. Calcium hydroxide + Carbon dioxide → Calcium carbonate + Water

The balanced chemical equation for the following word equation is:

1. ${\text{Ca(OH)}}_2\text{(aq)}+{\text{CO}}_2\text{(g)}\to {\text{CaCO}}_3\text{(aq)}+{\text{H}}_2\text{O}\text{(l)}$
2. ${\text{Ca(OH)}}_2\text{(aq)}+2{\text{CO}}_2\text{(g)}\to 2{\text{CaCO}}_3\text{(aq)}+{\text{H}}_2\text{O(l)}$
3. $2{\text{Ca(OH)}}_2\text{(aq)}+{\text{CO}}_2\text{(g)}\to 2{\text{CaCO}}_3\text{(aq)}+2{\text{H}}_2\text{O(l)}$
4. $2{\text{Ca(OH)}}_2\text{(aq)}+{\text{CO}}_2\text{(g)}\to {\text{CaCO}}_3\text{(aq)}+2{\text{H}}_2\text{O(l)}$

Q.

What is the balanced form of the equation written below?

$Cu+H_{2}S{O}_4\to CuS{O}_4+S{O}_2+H_{2}O$

1. $Cu+2H_{2}S{O}_4\to CuS{O}_4+S{O}_2+H_{2}O$

2. $Cu+4H_{2}S{O}_4\to CuS{O}_4+S{O}_2+H_{2}O$

3. $Cu+3H_{2}S{O}_4\to CuS{O}_4+S{O}_2+H_{2}O$

4. $2Cu+H_{2}S{O}_4\to 2CuS{O}_4+S{O}_2+H_{2}O$

Q. The total amount of matter before and after a chemical reaction remains the same.

1. False
2. True

Q. What will be the values of the coefficients x, y and z if the given reaction is balanced?

${\text{xFeCl}}_3+\text{yMgO}\to {\text{Fe}}_{\text{2}}{\text{O}}_3+{\text{zMgCl}}_2$

1. x = 2, y = 4, z = 3
2. x = 2, y = 3, z = 3
3. x = 3, y = 2, z = 2
4. x = 3, y = 2, z = 3

Q.

What should be the number of atoms of Tin in the balanced form of the equation below?

$A{s}_2{O}_3+SnC{l}_2+HCl\to SnC{l}_4+As+H_{2}O$

1. 3

2. 2

3. 6

4. 1

Q. Which metal is preferred for collecting hydrogen from cold water? Write a balanced equation for each case.

Q.

28. Complete and balance the following equation:

• ${\mathrm{K}}_2{\mathrm{CO}}_3+\hspace{0.17em}\mathrm{HCl}\to$