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Chemical Reactions and Equations Test - 26

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Chemical Reactions and Equations Test - 26
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  • Question 1
    1 / -0
    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:
    Solution
    A double displacement reaction is a type of reaction where part of one reactant is replaced by part of another reactant.
    $$CuSO_4 + H_2S \rightarrow CuS + H_2SO_4$$
  • Question 2
    1 / -0
    Complete the chemical reaction $$Mg(s)+H_2SO_4(aq)\rightarrow$$? 
    Solution
    Magnesium reacts with $$H_2SO_4$$ to form magnesium sulphate $$(MgSO_4)$$ and hydrogen gas.

    $$Mg(s)+H_2SO_4(aq)\rightarrow MgSO_4+H_2$$

    Hence, the correct option is C.
  • Question 3
    1 / -0
    $$Lead\ Sulphate + Ammonium\ Hydroxide \rightarrow Ammonium\ Sulphate + Lead\ Hydroxide$$

    Identify the type of reaction.
    Solution
    Reaction: $$PbSO_4 +2NH_4OH \rightarrow Pb(OH)_2 +(NH_4)_2SO_4$$

    In this reaction, two reactants exchange their ions to form new compounds. This is a double displacement reaction.
  • Question 4
    1 / -0
    Identify the following reactions as endothermic or exothermic.
    (i) $$2NaHCO_3+  \text{energy}\longrightarrow Na_2CO_3+H_2O+CO_2$$
    (ii) $$2Mg+O_2\longrightarrow 2MgO+\text{energy}$$
    Solution
    Reaction with the absorption of energy is called an endothermic reaction.
    In the reaction, 
    (i) Sodium bicarbonate needs the energy to form sodium carbonate, water, and carbon dioxide. 
    Hence it is an endothermic reaction.

    Reaction with the release of energy is called an exothermic reaction.
    (ii) On the burning of magnesium metal with oxygen gas, magnesium oxide is formed by the release of energy in the form of heat and light.
    Hence it is an exothermic reaction.
  • Question 5
    1 / -0
    Balance the equation by providing the missing coefficients.
    $$.. C_2H_4(g)\quad+\quad  ..O_2(g)\longrightarrow \quad.. CO_2(g)\quad+\quad.. H_2O(g)$$
    Solution
    Balance reaction is,
    $$C_2H_4(g)+3O_2(g)\longrightarrow 2CO_2(g)+2H_2O(g)$$

    $$\text {Atoms         Atoms on reactant side (LHS)      Atoms on product side (RHS)}$$
         $$\text {C                              2                                                    2}$$
         $$\text {H                              4                                                    4}$$
         $$\text {O                              6                                                    6}$$

    Here, coefficients are $$1,3,2,2$$
    Option $$A$$ is correct.
  • Question 6
    1 / -0
    $$xFe+S\rightarrow FeS\\ FeS+2HCl\rightarrow { FeCl }_{ y }+{ H }_{ 2 }S$$
    Find the value of x and y.
    Solution
    The values of x and y can be determined by just balancing the reaction.

    By balancing the given reaction we get,

    $$Fe+S\rightarrow FeS$$

    $$FeS+2HCl\rightarrow { FeCl }_{ 2 }+{ H }_{ 2 }S$$

    From the above-balanced equation, we get

    $$x=1$$ and $$y=2$$

    Option A is correct.
  • Question 7
    1 / -0
    Differentiate between an exothermic and an endothermic reaction.
    Solution
    The exothermic reaction releases heat energy into the surrounding system. The heat energy is released because the total energy of the product is less than the total energy of the reaction. However, in the case of endothermic reactions, heat is absorbed from the surrounding.
    Hence, the correct option is $$B$$
  • Question 8
    1 / -0
    What type of chemical reaction is it?
    Calcium + oxygen $$\rightarrow$$ Calcium oxide 
    Solution
    Reaction:
    $$2Ca+O_2 \rightarrow 2CaO$$
    This is a combination reaction.
  • Question 9
    1 / -0
    On passing excess $$CO_2$$ in aqueous solution of sodium carbonate, the substance obtained is :
    Solution
    $$Na_2 CO_3 + CO_2 + H_2O \rightarrow 2NaHCO_3$$
    Hence, sodium bicarbonate is formed on passing carbon dioxide in excess in aqueous solution of sodium carbonate. Hence, option B is the correct answer.
  • Question 10
    1 / -0
    (i) Reaction between calcium oxide and water is a ...... reaction.
    (ii) Action of strong heat on mercuric oxide is a ...... reaction.
    Solution
    The reaction between calcium oxide and water gives calcium hydroxide and it is an example of a combination reaction. A combination reaction is a type of reaction in which two or more reactants combine to give a single product.
    Mercuric oxide on strong heating decomposes to form mercury and oxygen and it is an example of a decomposition reaction. A decomposition reaction can be defined as a chemical reaction in which one reactant breaks down into two or more products.
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