Assessment-1-Chemical Reaction-Chap-1
Assessment-1-Chemical Reaction-Chap-1
Assessment-1-Chemical Reaction-Chap-1
MARKS:30
DURATION:60MIN
.Question 1. (1M)
Question 2. (1M)
Assertion (A) : Following is a balanced chemical equation for the action of steam on iron :
3Fe + 4H2O → Fe3O4 + 4H2
Reason (R): The law of conservation of mass holds good for a chemical equation.
(a) Both (A) and (R) are true and reason (R) is the correct explanation of the assertion (A)
(b) Both (A) and (R) are true, but reason (R) is not the correct explanation of the assertion
(A).
(c) (A) is true, but (R) is false.
(d) (A) is false, but (R) is true. (2020)
Question 3. (2M)
(a) State the law that is followed by balancing a chemical equation.
(b) Balance the following chemical equation: Na + H2O → NaOH + H2 (Board Term I, 2013)
Question 4. (2M)
Question 5. (1*3=3M)
Question 6. (1M)
Question 7. (1M)
When hydrogen sulphide gas is passed through a blue solution of copper sulphate, a black
precipitate of copper sulphide is obtained and the sulphuric acid so formed remains in the
solution. The reaction is an example of a (2020)
(a) combination reaction
(b) displacement reaction
(c) decomposition reaction
(d) double displacement reaction.
Question 8. (1M)
In a double displacement reaction such as the reaction between sodium sulphate solution and
barium chloride solution :
(A) exchange of atoms takes place
(B) exchange of ions takes place
(C) a precipitate is produced
(D) an insoluble salt is produced
The correct option is (2020)
(a) (B) and (D)
(b) (A) and (C)
(c) only (B)
(d) (B), (C) and (D)
Question 9. (1M)
In which of the following, the identity of initial substance remains unchanged? (2020)
(a) Curdling of milk
(b) Formation of crystals by process of crystallisation
(c) Fermentation of grapes
(d) Digestion of food
State the type of chemical reactions, represented by the following equations : (Board Term I,
2014)
(a) A + BC → AC + B
(b) A + B → C
(c) PQ + RS → PS + RQ
(d) A2O3 + 2B → B2O3 + 2A