Answer :

(a) Hydrogen gas combines with nitrogen to form ammonia.
The equation of the above reaction is
H2 (g) + N2 (g) → NH3 (g)
Step 1 - To balance chemical equations, first list the number of atoms of a different type that are present in the chemical equation on both sides –

 Step 2 - To start balancing, we take all compound in the reaction and start balancing the reaction

Hence the Balanced Chemical Equation is 3H2 + N2  →2NH3

The following questions are solved similarly.
(b)
Hydrogen sulphide gas burns in air to give water and sulphur dioxide.
The equation of the above chemical change is
H2S + O2 → H2O + SO2
Step 1 - To balance chemical equations, first list the number of atoms of a different type that are present in the chemical equation on both sides –

Step 2 - To start balancing, we take all compound in the reaction and start balancing the reaction

 
Hence, the Balanced Chemical Equation is

2H2S (g) + 3O2 (g) → 2H2O (l) + 2SO2 (g)

 The following questions are solved similarly


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

The equation of the above reaction is
BaCl2 + Al2(SO4)3 (aq) → AlCl3 (aq) +BaSO4 (s)
Step 1 - To balance chemical equations, first list the number of atoms of a different type that are present in the chemical equation on both sides –

 

Step 2 - To start balancing, we take all compound in the reaction and start balancing the reaction.  

  

Thus, we get
3BaCl2 (aq) + Al2(SO4)3 (aq) → 2AlCl3 (aq) + 3BaSO4 (s)

 
(d) Potassium metal reacts with water to give potassium hydroxide and hydrogen

The equation of the above reaction is
K + H2O → KOH +H2
Step 1 - To balance chemical equations, first list the number of atoms of a different type that are present in the chemical equation on both sides –

 

Step 2 - To start balancing, we take all compound in the reaction and start balancing the reaction

Thus, using the above table the balanced chemical equation is
2K (s) + 2H2O (l) → 2KOH (aq) + H2 (g)

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