Online Test of Chapter 1 Chemical Reactions and Equations 2 Science| Class 10th

1. Write values of a,b,c and d so that following chemical equation is balanced
aAl + bHCl → cAlCl₃ + dH₂
(i) a=1,b=3,c=1,d=3
(ii) a=2,b=6,c=2.d=2
(iii) a=2,b=6,c=2,d=3
(iv) a=2,b=3,c=2,d=3

2. Which of the following reactions satisfies this condition? :
Iron nails kept with dilute sulphuric acid and ferric sulphite solution is formed and hydrogen gas is released.
(i) 2Fe(s) + 3H₂ SO₄(l)→ Fe₂ (SO₄)₃(l) + 3H₂(g)
(ii) 2Fe(s) + 2H₂SO₄(aq) → Fe₂(SO₄)₃(s) + 4H₂ (g)
(iii) 2Fe(s) + 2H₂SO₄ (aq) → 3Fe₂(SO₄)₃(aq) + 2H₂(g)
(iv) 2Fe(s)+3H₂SO₄ (aq) → Fe₂(SO₄)₃ (aq) + 3H₂ (g)

3. The LPG gas which we use in our home is basically butane gas(C₄H₁₀) . It is burnt in presence of air. This is an exothermic reaction and energy released is used to cook. Carbon di oxide gas and steam is product for this reaction. Which of the following represents proper chemical equation for this process?
(i) C₄H₁₀ (g) + 3O₂ (g) → 4CO₂ (g) + 5H₂O
(ii) 2C₄H₁₀ (g) + 11O₂ (g) → 7CO₂ (g) + 10H₂O(l)
(iii) 2C₄H₁₀ (g) + 13O₂ (g) → 8CO₂ (g) + 10H₂O(g)
(iv) 2C₄H₁₀ (g) + 11O₂ (g) → 7CO₂ (g) + 10H₂O(g)

4. The main component of Biogas is methane (CH₄). It burns to generate energy. The carbon di oxide gas and water in gaseous form is obtained as product of combustion of methane. Which of the following represents the chemical reaction properly?
(i) CH₄ (g) + 2O₂(g) → CO₂(g) + 2H₂O(g)
(ii) 2CH₄ (g) + 4O₂(g) → 2CO₂(g)+ 2H₂O(g)
(iii) 2CH₄ + 3O₂ → CO₂ +2H₂O(l)
(iv)CH₄ + 2O₂ → CO₂ + 2H₂O(l)

5. Calcium oxide reacts with water to form calcium Hydroxide. Which type of reaction is this?
(i) Combination and endothermic reaction
(ii) Combination and exothermic reaction
(iii) Decomposition and Endothermic reaction
(iv) Decomposition and exothermic reaction

6. Combustion of methane gas is
(i) Exothermic Reaction
(ii) Endothermic Reaction
(iii) Combination Reaction
(iv) Both (i) and (ii)

7. What kind of reaction respiration is
(i) Exothermic Process
(ii) Endothermic Process
(iii) Decomposition Reaction
(iv) Both (ii) and (iii)

8. A smell of burning sulphur is obtained when Ferrous sulphate is heated. Why?
(i) Evolution of Sulphur tri oxide
(ii) Formation of Ferric Oxide
(iii) Formation of Ferrous sulphate
(iv) None

9. Which of the following is/are uses of Calcium Carbonate?
(i) White washing
(ii) Marble manufacturing
(iii) Building material
(iv) All

10. On thermal decomposition of lead nitrate, nitrogen dioxide gas is evolved. How it presence can be verified?
(i) It will turn lime water milky
(ii) Rotten egg odour
(iii) Brown fumes can be observed
(iv) Reddish fume is observed.