A chemical equation is a shorthand method of representing a chemical reaction in terms of symbols and formulas for the various reactants and products. In a chemical equation, reactants are written on the left side of an arrow, and products are written on the right side of the arrow.
Download Class 10 Chemistry Worksheet on Chapter 1 Chemical Reactions and Equations Set 3 PDF
CBSE Class 10 Chemistry Chapter 1 Chemical Reactions and Equations – Set 3
Q-1: Write the equations for the following reactions in the ionic form and balance the ionic equations.
i) Magnesium is treated with dilute sulphuric acid
ii) Stannous chloride solution is added into mercuric chloride solution
iii) H2S gas is passed into copper(II) sulphate solution.
iv) Liquid bromine is added to the container of sodium iodide crystals
v) Aluminium is treated with dilute hydrochloric acid
Q-2: Fill in the blanks
a) Aluminium reacts with NaOH to form _______ and ________.
b) In the activity series of metal, aluminium is ________ active than iron.
c) Copper sulphate solution is _______ in nature.
d) A reaction between an acid and base is called __________.
e) ___________ slows down the process of oxidation in packaged food.
Q-3: What is the correct representation of the reaction that occurs during the chlor alkali process?
a) 2NaCl(l) + 2H2O(l) → 2NaOH(l) + Cl2(g) + H2(g)
b) 2NaCl(aq) + 2H2O(aq) → 2NaOH(aq) + Cl2(g) + H2(g)
c) 2NaCl(aq) + 2H2O(l) → 2NaOH(aq) + Cl2(aq) + H2(aq)
d) 2NaCl(aq) + 2H2O(l) → 2NaOH(aq) + Cl2(g) + H2(g)
Q-4: Which of the following statements is correct?
a) Metals act as reducing agent and non metals act as oxidising agent
b) Metals act as oxidising agent and non metals acts as reducing agent
c) Metals and nonmetals both acts as reducing agents
d) Metals and nonmetals both acts as oxidising agents
Q-5: What do you expect to happen when the AgNO3 solution is added to i) NaCl solution ii) CCl4? Give reasons.
Q-6: Give reasons for the following
i) Zinc and Aluminium are reactive metals and still they don’t corrode easily.
ii) Bronze metals get coated with a greenish layer if not stored/cleaned properly.
Q-7: The following aqueous solutions are given to you:
ZnSO4, PbSO4, Ni(SO4)2 and Al2(SO4)3
You are also given vessels made of Zn, Pb , Al and Ni.
In each of these vessels which solution/solutions should not be placed?
Q-8: Match the column I with column II
| Column I | Column II |
|---|---|
| A) FeS + HCl acid | i) Turns lime water milky |
| B) Ba(OH)2+NH4Cl | ii) Rotten egg like smell |
| C) 2SO2+O2 →2SO3 | iii) Endothermic |
| D) CaCO3 + HCl acid | iv) Combination reactions
v) Exothermic vi) Oxidation reaction |
Q-9: What type of chemical reactions take place when
i) Magnesium wire is burnt in air
ii) Digestion of food occurs in the body
iii) Ammonia and hydrogen chloride are mixed
iv) Limestone is heated
v) Sulphuric acid is added to barium chloride solution
Q-10: Which of the following does not qualify as a base?
a) Mg(OH)2
b) KOH
c) CH3OH
d) NH4OH
Q-11:Which of the following gases can be used to store a fresh sample of oil for an extended period of time?
a) N2 and O2
b) CO2 and O2
c) He and N2
d) CO2 and He
Q-12: Is milk souring caused by a chemical or physical change? Explain
Q-13: In each of the following reactions, which gas will be formed?
a) Zinc with dilute HCl
b) Zinc with dilute NaOH
c) Zinc with dilute NaOH on heating
d) Dilute HCl with solid sodium carbonate
e) Dilute NaOH with sodium carbonate
Statements for linked answer questions 14-17
A chemical equation is balanced by making the atoms of each element equal on both sides of the equation. This is due to the fact that the law of conservation of mass must apply. Furthermore, conditions such as the state of each reactant and product, heat change, temperature, and so on must be indicated in order for the balance equation to be fully informative. The most important application of a balanced chemical equation is in quantitative calculations known as stoichiometry.
Q-14: When steam is passed over heated iron, magnetic oxide of iron and hydrogen gas are formed. In the balanced equation, the coefficients of Fe and H2 are respectively
a) 4,3
b) 3.4
c) 2,3
d) 1,1
Q-15: Which of the following is an example of an endothermic reaction?
a) Respiration
b) Burning of coke
c) N2+O2 → 2NO
d) Dissolution of sodium sulphate
Q-16: Which of the following correctly represents a balanced chemical equation?
a) (CH3COO)2Pb(aq) + 2HCl(aq)→ PbCl2 (s)+ CH3COOH(aq)
b) Fe2O3(s)+ 3CO(g) + heat → 2Fe(s) + 3CO2(g)
c) 2H2S(g) + O2(g) → S(l) + H2O(l)
d) Mg(s) + Cl2(g) → 2MgCl2(s)
Q-17: How many grams of sodium iodide, NaI must be used to produce 22.4 g of iodine, I2?
Q-18:
Assertion: When copper powder is heated in air, it turns black.
Reason: Copper reacts with the H2S gas of the air forming black CuS.
a) Both A and R are true and R is the correct explanation of the assertion.
b) Both A and R are true but R is not the correct explanation of the assertion.
c) A is true but R is false
d) A is false but R is true
Q-19: Why is hydrogen peroxide stored in colored bottles?
Q-20: Diluted sulfuric acid is used to treat a metal. The collected gas is collected using the method depicted in the figure. Respond to the following questions:
a) Identify the gas.
b) Provide one distinct test for the gas.
c) Name the method for collecting gas.
d) Is the gas water soluble or insoluble?
e) Is gas heavier or lighter than air?
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