A complete chemical equation symbolically represents the reactants, products, and their physical states. A chemical equation is balanced when the number of atoms of each type involved in a chemical reaction on the reactant and product sides of the equation is the same. Equations must be balanced at all times.
Download Class 10 Chemistry Worksheet on Chapter 1 Chemical Reactions and Equations Set 2 PDF
CBSE Class 10 Chemistry Chapter 1 Chemical Reactions and Equations Worksheet โ Set 2
Q-1: Balance the following chemical equations:
i) CS2 + O2 โ CO2 + SO2
ii) SO2 + H2S โ H2O+ S
iii) CaC2 + H2O โ Ca(OH)2 + C2H2
iv) Na + H2O โ NaOH + H2
v) HgO+ heat โ Hg + O2
Q-2: Fill in the blanks
i) Respiration involves the oxidation of _________ in the body.
ii) When water is electrolytically decomposed, H2 and O2 gas are obtained at _____ and ______ respectively.
iii) When H2 gas is passed over heated copper(II) oxide, the residue left behind is that of______.
iv) Aluminium is highly _______ to corrosion.
v) The reactions that involve absorption of heat are called _______
Q-3: Salt formation occurs when small amount of acid is added to
i) water
ii) acid
iii) base
iv) pure water
Q-4: A visually impaired student can use which of the following as an acid-base indicator?
i) Litmus
ii) Red cabbage
iii) Onion
iv) Petunia Leaves
Q-5: Match the column I with appropriate entries of Column II
| Column I | Column II |
|---|---|
| A) Silver nitrate + Sodium chloride | i) Red |
| B) Lead nitrate + Potassium Iodide | ii) Black |
| C) Sodium sulphate + Barium chloride | iii) Yellow |
| D) Copper + oxygen + heat | Iv) Bluish green |
| E) Copper sulphate + Sodium hydroxide | v) White |
Q-6: What types of reactions do the following represent?
i) A+BโC
ii) Aโ B+C
iii) A+B2+ โ A2+ + B
iv) A+ BCโ AC + B
v) AB+CD โ AD + BC
Q-7: Give an example of when corrosion is a benefit rather than a disadvantage.
Q-8: Is it possible for oxidation and reduction to occur independently? What are your thoughts on this?
Q-9: How can you make a balanced chemical equation more informative?
Q-10: State True and False. If Fase, state reasons.
a) Dissolution of anhydrous copper sulphate is an exothermic process
b) Hydrogen gas is a combustible gas
c) If copper turnings are added to colourless silver nitrate solution, it turns blue after some time
d) Burning of candle wax is physical change
e) 100g of CaCO3 on complete decomposition produces 10 litres of CO2 at STP
Q-11: Which of the following observations can be used to determine the presence or absence of a chemical reaction?
a) Change in identity of reactant
b) Evolution of gas
c) Change in colour
d) All of the above
Q-12: Rancidity is the process of
a) Reduction
b) Oxidation
c) Fermentation
d) Reduction and oxidation
Q-13: Determine which substances are reduced and oxidised in the following reactions.
a) 2H2S + SO2โ 3S + 2H2O
b) MnO2 + 4HCl โ 2H2O + MnCl2 + Cl2
c) Fe2O3 +2 Al โ Al2O3 + Fe
Statement for linked answer questions 14-17
To investigate the relative activity of metals, four metals, Cu, Ag, Zn, and Pb, as well as their salts CuSO4, AgNO3, ZnSO4, and PbSO4, were used. In four separate beakers, the salts were dissolved in water. Small amounts of these solutions were placed in four test tubes, and each of these four test tubes was dipped in a strip of copper. The process was repeated for each of the Ag, Zn, and Pb strips.
Q-14: Which of the following reactions will take place?
a) Pb in ZnSO4 solution
b) Ag in CuSO4 solution
c) Zn in PbSO4 solution
d) Cu in PbSO4 solution
Q-15: For the reaction, chosen in Q-14, what will be the colour of the solution?
a) Red
b) Yellow
c) Black
d) White
Q-16: What type of reaction is involved in the reaction chosen above?
a) Double Displacement
b) Displacement
c) Decomposition
d) Precipitation
Q-17: On the basis of your study, what will be the correct order of their activity?
Q-18:
Assertion: Iron gets corroded in the moist air but silver is not.
Reason: Silver is less active metal than iron.
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: In the reaction
What do the symbol ฮ and MnO2 written on the arrow signify?
Q-20: Dilute sulphuric acid was added to the test tube containing iron(II) sulphide, and a strip of paper dipped in a lead acetate solution was placed over the test tube’s mouth.
a) What gas was formed during the reaction? Describe the reaction that is taking place.
b) What colour and odour does the gas have?
c) What will happen to the lead acetate paper that has been placed over the mouth of the test tube? Write down the reaction.
d) Determine the type of reaction occurring in c).
e) Other than the precipitate, give the common name for the product formed in c).
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