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Chemical Reactions and Equations Test - 19

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Chemical Reactions and Equations Test - 19
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  • Question 1
    1 / -0

    Which two gases are released on heating lead nitrate?

    Solution

    Lead nitrate on heating decomposes to give nitrogen dioxide, yellow solids of lead oxide and oxygen gas.

    Hence, option (C) is correct.

  • Question 2
    1 / -0

    Which of the following is not an example of chemical change?

    Solution

    Water vapour can again be converted to water so it is a physical change and in other options all changes are such that cannot be reverted back and are examples of chemical change.

    Hence, option (A) is correct.

  • Question 3
    1 / -0

    The colour of Copper metal is:

    Solution

    It is a soft, malleable, and ductile metal with very high thermal and electrical conductivity. A freshly exposed surface of pure copper has a pinkish-orange color but when brought into normal conditions it gets partly oxidized and gives a Reddish Brown Color also known as Copper Color. Copper is used as a conductor of heat and electricity, as a building material, and as a constituent of various metal alloys, such as sterling silver used in jewelry, cupronickel used to make marine hardware and coins, and constantan used in strain gauges and thermocouples for temperature measurement.

    Hence, option (C) is correct.

  • Question 4
    1 / -0

    PbI2 is:

    Solution

    PbI2 is not a purely ionic compound, but it is covalent. So, the colorless ions (I-) and (Pb2+) combine into a completely new entity, PbI2. That entity is yellow in color.

    Hence, option (A) is correct.

  • Question 5
    1 / -0

    Which is the formula of magnesium nitride?

    Solution

    Valency of Magnsium is 2 and Nitrogen is 3 so formula Mg3N2.

    Hence, option (D) is correct.

  • Question 6
    1 / -0

    Can we store CuSO4 in iron container and why?

    Solution

    Reaction will take place between Fe and CuSO4 and Fe will displace Cu from CuSO4.

    Copper Sulphate cannot be stored in Iron Container as we know that Iron is more reactive than Copper, and it will immediately react and there will be a displacement reaction where Iron will displace Copper. This will corrode the container and Copper sulphate too.

    The reaction will be:

    Fe+CuSO4=FeSO4+Cu

    Hence, option (B) is correct.

  • Question 7
    1 / -0

    Some crystals of copper sulphate were dissolved in water. The colour of the solution obtained would be:

    Solution

    CuSO4 dissolves in water to give a blue color because the crystals are of Blue Color.

    Hence, option (A) is correct.

  • Question 8
    1 / -0

    Which of the following is the incorrect method of preventing rusting?

    Solution

    The most common method of preventing the rusting of iron is to coat its surface with paint or apply grease, oil or varnish. Rusting of iron can be prevented by galvanization. The process of depositing a thin layer of Zinc metal on Iron objects is called galvanization. Iron articles should be covered with plastic is the incorrect method of preventing rusting.

    Hence, option (D) is correct.

  • Question 9
    1 / -0

    Which of the following solution is obtained on reacting zinc metal with NaOH solution?

    Solution

    Zn+2NaOH Na2ZnO2+ H2

    Zinc react with sodium hydroxide to produce zincate sodium and hydrogen. This reaction takes place at a temperature near 550°C.

    Hence, option (A) is correct.

  • Question 10
    1 / -0

    The element or compound which undergoes reduction is:

    Solution

    An oxidizing agent, or oxidant, gains electrons and is reduced in a chemical reaction. Also, known as the electron acceptor, the oxidizing agent is normally in one of its higher possible oxidation states because it will gain electrons and be reduced. Examples of oxidizing agents include halogens, potassium nitrate, and nitric acid. 

    Hence, option (D) is correct.

  • Question 11
    1 / -0

    ANa+BH2OCNaOH+DH2. What would come in place of A, B, C, and D to balance the equation?

    Solution

    Reactants at LHS is equal to products at RHS

    2Na+2H2O 2NaOH+H2

    A=2, B=2, C=2 and D=1

    Hence, option (D) is correct.

  • Question 12
    1 / -0

    Which one of the following will be required to identify the gas evolved when diluted HCl reacts with zinc metal?

    Solution

    Zinc is a reactive metal which on reaction with HCl produces hydrogen gas.

    Zn+2HClZnCl2+H2 

    If we introduce a Burning Splinter above the reaction the gas will burn with a pop sound which is a commonly used test for the presence of Hydrogen.

    Hence, option (B) is correct.

  • Question 13
    1 / -0

    The odour of SO2 gas is:

    Solution

    Sulfur dioxide (also sulphur dioxide) is the chemical compound with the formula SO2. It is a toxic gas with a pungent, irritating smell. It is released naturally by volcanic activity and is produced as a by-product of the burning of fossil fuels contaminated with sulfur compounds.

    Hence, option (C) is correct.

  • Question 14
    1 / -0

    ZnCO3(s) undergoes ‘X’ to give ZnO+(CO2). What does ‘X’ symbolized here?

    Solution

    ZnCO3 on heating decomposes to give ZnO and CO2.

    The reaction goes on as follows:

    ZnCO3tCZnO+CO2

    Hence, option (A) is correct.

  • Question 15
    1 / -0

    The bleaching action of chlorine is ___________ reaction.

    Solution

    The bleaching action of chlorine is an oxidation reaction.

    It requires moisture for its bleaching action. Chlorine reacts with water to form hydrochloric and hypochlorous acids.

    Cl2+H2OHCl+HClO

    Hypochlorous acid (HClO) is unstable, and it easily separates to form nascent oxygen.

    HClOHCl+[O]

    Nascent oxygen is the most powerful oxidizing agent. Its formation is responsible for the bleaching nature of chlorine in the presence of moisture.

    Hence, the correct option is (D).

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