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Chemical Reactions and Equations Science - Chemical Reactions and Equations

Maharashtra Board - STD 10 - Science (MSBSHSE - Semi English Medium). 199 questions in this chapter.

Question types

Chemical Reactions and Equations question types

199 questions across 7 question groups — pick any mix to generate a Science paper with step-by-step answer keys.

199
Questions
7
Question groups
5
Question types
Sample Questions

Chemical Reactions and Equations questions

One sample from each question group in this chapter. Select any group above to see the full set with answer keys.

Q 1M.C.Q1 Mark
The chemical equations are balanced to satisfy one of the following laws in chemical reactions. This law is know as:
  • A
    Law of conservation of momentum.
  • ✓
    Law of conservation of mass.
  • C
    Law of conservation of motion.
  • D
    Law of conservation of magnetism.

Answer: B.

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Q 2M.C.Q1 Mark
A white precipitate can be obtained by adding dilute sulphuric acid to:
  • A
    $\ce{CuSO_4}$ solution.
  • B
    $\ce{Nacl}$ solution.
  • ✓
    $\ce{BaCl_2}$ solution.
  • D
    $\ce{Na_2SO_4}$ solution.

Answer: C.

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Q 3M.C.Q1 Mark
The chemical reaction between quicklime and water is characterised by:
  • A
    Evolution of hydrogen gas.
  • B
    Formation of slaked lime precipitate.
  • ✓
    Change in temperature of mixture.
  • D
    Change in colour of the product.

Answer: C.

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Q 4M.C.Q1 Mark
An acid which can decolourise purple coloured potassium permanganate solution is:
  • A
    Sulphuric acid.
  • ✓
    Citric acid.
  • C
    Carbonic acid.
  • D
    Hydrochloric acid.

Answer: B.

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Q 5M.C.Q1 Mark
One of the following is an endothermic reaction. This is:
  • A
    Combination of carbon and oxygen to form carbon monoxide.
  • ✓
    Combination of nitrogen and oxygen to form nitrogen monoxide.
  • C
    Combination of glucose and oxygen to form carbon dioxide and water.
  • D
    Combination of zinc and hydrochloric acid to form zinc chloride and hydrogen.

Answer: B.

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Q 9Answer the following questions:[1 M]1 Mark
In the following reaction between lead sulphide and hydrogen peroxide:
$\text{PbS}(\text{s})\ +\ 4\text{H}_2\text{O}_2(\text{aq})\xrightarrow{\ \ \ \ \ \ \ \ \ \ \ }\text{PbSO}_4(\text{s})\ +\ \text{4H}_2\text{O}(\text{l})$
  1. Which substance is reduced?
  2. Which substance is oxidised?
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Q 12Answer the following questions: [2 M]2 Marks
Express the following facts in the form of a balanced chemical equation:“When a strip of copper metal is placed in a solution of silver nitrate, metallic silver is precipitated and a solution containing copper nitrate is formed”.
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Q 21Answer the following questions: [5 M]5 Marks
The metal M reacts vigorously with water to form a solution S and a gas G. The solution S turns red litmus to blue whereas gas G, which is lighter than air, burns with a pop sound. Metal M has a low melting point and it is used as a coolant in nuclear reactors.
  1. What is metal M?
  2. What is solution S? Is it acidic or alkaline?
  3. What is gas G?
  4. Write a balanced chemical equation for the reaction which takes place when metal M reacts with water.
  5. Is this reaction exothermic or endothermic?
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Q 22Answer the following questions: [5 M]5 Marks
Gas A, which is the major cause of global warming, combines with hydrogen oxide $B$ in nature in the presence of an environmental factor $C$ and a green material $D$ to form a six carbon organic compounds $E$ and a gas $F$. The gas $F$ is necessary for breathing.
  1. What is gas $A?$
  2. What is the common name of $B?$
  3. What do you think could be $C?$
  4. What is material $D?$ Where is it found$?$
  5. Name the organic compound $E.$
  6. What is gas $F? $ Name the natural process during which it is released.
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Q 23Answer the following questions: [5 M]5 Marks
When water is added gradually to a white solid $X, $ a hissing sound is heard and a lot of heat is produced forming a product $Y.$ A suspension of $Y$ in water is applied to the walls of a house during white washing. A clear solution of $Y$ is also used for testing carbon dioxide gas in the laboratory.
  1. What could be solid $X?$ Write its chemical formula.
  2. What could be product $Y?$ Write its chemical formula.
  3. What is the common name of the solution of $Y$ which is used for testing carbon dioxide gas$?$
  4. Write chemical equation of the reaction which takes place on adding water to slid $X.$
  5. Which characteristic of chemical reactions is illustrated by this example$?$
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Q 24Answer the following questions: [5 M]5 Marks
A solid substance $P$ which is very hard is used in the construction of many buildings, especially flooring. When substance $P$ is heated strongly, it decomposes to form another solid $ Q$ and a gas $R$ is given out. Solid $Q$ reacts with water with the release of a lot of heat to form a substance S. When gas $R $ is passed into a clear solution of substance $S,$ then a white precipitate of substance $T$ is formed. The substance $T$ has the same chemical composition as starting substance $P.$
  1. What is substance $P?$ Write its common name as well as chemical formula.
  2. What is substance $Q?$
  3. What is gas $R?$
  4. What is substance $S?$ What is its clear solution known as$?$
  5. What is substance $T?$ Name any two natural forms in which substance T occurs in nature.
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Q 25Answer the following questions: [5 M]5 Marks
When metal $X$ is treated with a dilute acid $Y$, then a gas $Z$ is evolved which burns readily by making a little explosion.
  1. Name any two metals which can behave like metal $X.$
  2. Name any two acids which can behave like acid $Y.$
  3. Name the gas $Z.$
  4. Is the gas $Z$ lighter than or heavier than air$?$
  5. Is the reaction between metal $X$ and dilute acid $Y,$ exothermic or endothermic$?$
  6. By taking a specific example of metal $X$ and dilute acid $Y,$ write a balanced chemical equation for the reaction which takes place. Also indicate physical states of all the reactants and products.
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Q 29Fill in the blanks.1 Mark
Complete and balance the following equations:
$\text{Ca}(\text{OH)}_2\ +\ ........\ \xrightarrow{\ \ \ \ \ \ \ \ \ \ \ }\text{CaCO}_3\ +\ \text{H}_2\text{O}$
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Q 30Fill in the blanks.1 Mark
Fill in the following blanks with suitable words:
The addition of oxygen to a substance is called __________ whereas removal of oxygen is called __________.
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Q 31Fill in the blanks.1 Mark
Fill in the following blanks with suitable words:
The addition of hydrogen to a substance is called __________ whereas removal of hydrogen is called __________.
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