Class 10 Chemical Reaction And Equations Important Questions

By
Q. PAPER

MARKS-30                                                                           TIME- 70 MINUTES

Instructions:
  • Questions : 1 to 5 – 1 Mark each
  • Questions : 6 to 9 – 2 Marks each
  • Questions : 10 to 13 – 3 Marks each
  • Question 14 – 5 Marks

  1. On what chemical law, balancing of chemical equation is based?
  2. Identify the compound oxidized in the following reaction:
H2S (g) + Cl2 (g) S (s) + HCl (g)
  1. Give an example of photochemical reaction.
  2. Name the reaction which forms insoluble salts.
  3. Name the product obtained and type of reaction given below:
Na2SO4 + BaCl2 _________ + ________
  1. Explain the following in terms of gain or loss of oxygen with one example:
    1. Oxidation
    2. Reduction
  2. A copper coin is kept in a solution of silver nitrate for some time, what will happen to the coin and the colour of the solution?
  3. Why do we apply paint on iron articles?
  4. What happens chemically when quicklime is added to water?
  5. What is rancidity? Write the common methods to prevent it.
  6. What is corrosion? State the conditions necessary for rusting of iron. How rusting is harmful?
  7. Name the type of reactions in the following cases:
    1. Garbage producing foul smell
    2. Burning of natural gas.
    3. Carbon dioxide gas passed through lime water.
  8. Blue crystals of copper sulphate on heating in a dry test tube become colourless. Give reasons.
    1. Why can not a chemical change be normally reversed?
    2. Why is it always essential to balance a chemical equation?
    3. What happens when CO2 gas is passed through lime water and why does it disappear on passing excess CO2?
    4. Can rusting of iron take place in distilled water?

HOTS QUESTIONS (SOLVED)

Q.1.
A water insoluble substance ‘X’ on reacting with dilute H2SO4 released a colourless and odourless gas accompanied by brisk effervescence. When the gas was passed through water, the solution obtained turned blue litmus red. On bubbling the gas through lime water, it initially became milky and milkyness disappeared when the gas was passed in excess. Identify the substance ‘X’. Write its chemical equations of the reactions involved.
Ans.
The water insoluble substance ‘X’ is metal carbonate CaCO3.
CaCO3 (S) + H2SO4 (Aq) CaSO4(Aq) + H2O (Aq) + CO2 (G)
Ca(OH)2 + CO2 (G)CaCO3 (S) + H2O (L)
(milky)
CaCO3 (S) + CO2 (G)+ H2O (Aq)CaHCO3
(milkiness disappeared)

Q.2.
Ahmad took a magnesium ribbon (cleaned) and burned it on a flame. The white powder formed was taken in a test tube and water was added to it. He then tested the solution formed with red and blue litmus paper. What change was seen? Why?
Ans.
Red litmus paper turned blue.
Blue litmus paper remained blue.
This is because the magnesium ribbon on burning in air forms the white magnesium oxide. Which dissolved in water, it forms magnesium hydroxide, which is Basic in nature.

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Q.3.
Give one example of a combination reaction in which an element combines with a compound to give you a new compound.
Ans.
O2 + 2SO2 2SO3
8NH3 + 3Cl2 6NH4Cl +N2

Q.4.
Marble statues often slowly get corroded when kept in open for a long time. Assign a suitable explanation.


Q.5.
Mohan took pure water for the electrolytic decomposition of water but did not see any bubbles near the electrodes. Explain why?
Q. 6
Rancidity is a process used for spoiling of cooked food materials like vegetables, etc. When kept for long time in open. How can you prevent such process to proceed? Give an example.
Q. 7
A substance ‘X’ displaces ‘Y’ from its solution in water. It is called displacement reaction. What other chemical name can be given to such type of reactions? Explain, giving an example?
Q. 8
A grey coloured metal ‘Z’ (Atomic weight=65) is used in making dry cell. It reacts with dil. HCl to liberate a gas. What is the gas evolved? Calculate the minimum amount of ‘Z’ required to produce 100 litre of gas?
Q. 9
Why respiration is considered an exothermic reaction? Explain.

Q. 10
Why photosynthesis is considered an endothermic reaction? Explain.

Q. 11
Why decomposition reactions are called opposite of combination reactions? Write equations for these reactions.
Q. 12
A shiny brown coloured element ‘X’ on heating in air becomes a black coloured compound. Name the element ‘X’& black the coloured compound formed. Also write the equation

FA II
CHEMICAL REACTION AND EQUATIONS
Oral questions (Conversation type)
  1. How do you represent chemical changes in chemistry?
  2. What should you know to write a chemical equation?
  3. How are reactants and products separated in a chemical equation?
  1. Is it essential to write balanced chemical equation?
  2. What will happen if it is not balance?
  3. How do you know that the equation is not balance?
  1. What happens when calcium carbonate is heated?
  2. What is this reaction called?
  3. Does decomposition take place only on heating?
  1. What is oxidation?
  2. Can we call a chemical reaction an oxidation reaction in which hydrogen is removed?
  3. Give an example of everyday life where redox reaction takes place.
  1. What is corrosion?
  2. Give an example.
  3. What are the requirements for corrosion?
ORAL QUESTIONS
What is opposite to combination reaction?
To pack food articles, why do manufacturers flush out oxygen with nitrogen?
What is spoiling of food called, when kept for a long time?
What is the chemical reaction called, in which heat is evolved?
Silver articles get black coating. Name the phenomenon.
Which gas is evolved when acid is added to lime stone?
When a more reactive metal displaces a less reactive metal in solution, what is the reaction called?
What sign (+ or -) is given to exothermic reaction?
Which of the two is a redox reaction?
  1. Displacement
  2. Double displacement
What is one important similarity between rusting and burning?

QUIZ - WHO AM I
I am symbolic representation of a chemical change.
I am a metal which go on losing weight when constantly exposed to air and moisture.
I conduct electric current and get a green coating when exposed to humid atmosphere for long.
My blue colour starts fading when zinc metal is added to my aqueous solution.
I get reduced in a redox reaction.
I am formed during a chemical change.
I separate reactants from products when a chemical reaction is represented by a chemical equation.
I give a name to the reaction between acids and bases.
I am a chemical reaction which represents digestion of food in our body/
I am a process which is used to prevent rusting of iron objects / articles.


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