Creative assertion and reason questions chemistry chapter one

12th Standard EM

    Reg.No. :
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Chemistry

Don't use black pen
Time : 00:15:00 Hrs
Total Marks : 30

    Part - A

    Answer all questions

    15 x 2 = 30
  1. Assertion :Aluminium is used in the, design of chemical reactors, : medical equipments, , refrigeration units and gas' pipelines.
    Reason : Aluminium shows high resistance to corrosion
    (a) Both (A) and (R) are true and (R) is the correct explanation of (A)
    (b) Both (A) and (R) are true and (R) is not the correct explanation of (A).
    (c) (A) true but (R) false
    (d) Both (A) and (R) are false.

  2. Assertion(A) :Metallic zinc is used in galvanising metals such as iron and steel.
    Reason (R) :Zinc is also used to produce die castings
    a) Both (A) and (R) are true and (R) is the correct explanation of (A).
    b) Both (A) and (R) are true and (R) is not the correct explanation of (A).
    c) (A) true but (R) false.
    d) Both (A) and (R) are false.

  3. Assertion(A) : Zone refining is carried out in an inert gas atmosphere
    Reason (R):The metal is treated with a suitable reagent which can form a volatile compound with the metal.
    a) Both (A) and (R) are true and (R) is the correct explanation of (A).
    b) Both (A) and (R) are true and (R) is not the correct explanation of (A).
    c) (A) true but (R) false.
    d) Both (A) and (R) are false

  4. Assertion :Cuprite is concentrated by froth floatation process.
    Reason :Cuprite is the sulphide ore
    a) Both assertion and reason are true and the reason is the correct explanation of the assertion.
    b) Both assertion and reason are true but the reason is not the correct explanation of the assertion.
    |c) Assertion is true, but reason is false.
    d) Both assertion and reason are false

  5. Assertion :Calamine and Dolomite are the Carbonate ores.
    Reason :Calamine is ZnCO3 whereas dolomite is MgCO3.ZnCO3
    a) Both assertion and reason are true and the reason is the correct explanation of the assertion.
    b) Both assertion and reason are true but the reason is not the correct explanation of the assertion.
    c) Assertion is true, but reason is false.
    d) Both assertion and reason are false

  6. Assertion :Roasting process is involved in the metallurgy of Cu from malachite ore.
    Reason :Roasting is the process of heating the ore in the absence of air.
    a) Both assertion and reason are true and the reason is the correct explanation of the assertion.
    b) Both assertion and reason are true but the reason is not the correct explanation of the assertion.
    c) Assertion is true, but reason is false.
    d) Both assertion and reason are false.

  7. Assertion : Metallurgy ofAgfrom argentite is known as hydro-metallurgy.
    Reason :Argentite is Ag2S.
    a) Both assertion and reason are true and the reason is the correct explanation of the assertion.
    b) Both assertion and reason are true but the reason is not the correct explanation of the assertion.
    c) Assertion is true, but reason is false.
    d) Both assertion and reason are false

  8. Assertion :In the manufacturing of iron from hematite, silicon dioxide is added as flux
    Reason :Lime stone is used as acidic flux in many case
    a) Both assertion and reason are true and the reason is the correct explanation of the assertion.
    b) Both assertion and reason are true but the reason is not the correct explanation of the assertion.
    c) Assertion is true, but reason is false.
    d) Both assertion and reason are false

  9. Assertion :Wrought iron is purest form of iron with respect to other forms.
    Reason :It has less than 0.5% carbon.
    a) Both assertion and reason are true and the reason is the correct explanation of the assertion.
    b) Both assertion and reason are true but the reason is not the correct explanation of the assertion.
    c) Assertion is true, but reason is false.
    d) Both assertion and reason are false.

  10. Assertion :Aluminium metal is used as a reducing agent for the extraction of metals.
    Reason :Aluminium has great affinity for oxygen.
    a) Both assertion and reason are true and the reason is the correct explanation of the assertion.
    b) Both assertion and reason are true but the reason is not the correct explanation of the assertion.
    c) Assertion is true, but reason is. false.
    d) Both assertion and reason are false

  11. Assertion :Carbon is used in blast furnace for reduction of Fe2O3
    Reason :The gangue present is silica which is acidic in nature.
    a) Both assertion and reason are true and the reason is the correct explanation of the assertion.
    b) Both assertion and reason are true but the reason is not the correct explanation of the assertion.
    c) Assertion is true, but reason is false.
    d) Both assertion and reason are false

  12. Assertion :Ti can be purifed by van arkel process
    Reason : TiI4 is a volatile compound which decomposes at a high temperature.
    a) Both assertion and reason are true and the reason is the correct explanation of the assertion.
    b) Both assertion and reason are true but the reason is not the correct explanation of the assertion.
    c) Assertion is true, but reason is false.
    d) Both assertion and reason are false

  13. Assertion :Aluminothermic process is the extraction of chromium from I chromic oxide.
    Reason : Alumina has a high melting point.
    a) Both assertion and reason are true and the reason is the correct explanation of the assertion.
    b) Both assertion and reason are true but the reason is not the correct explanation of the assertion.
    c) Assertion is true, but reason is false.
    d) Both assertion and reason are false.

  14. Assertion :A dilute solution of NaCN is used for leaching ores of silver and gold.
    Reason : Impurities present in these ores dissolve in NaCN
    a) Both assertion and reason are true and the reason is the correct explanation of the assertion.
    b) Both assertion and reason are true but the reason is not the correct explanation of the assertion.
    c) Assertion is true, but reason is false.
    d) Both assertion and reason are false

  15. Assertion :Carbonate and sulphate are concentrated by froth floatation process
    Reason : Pine oil wets the gangue particle
    a) Both assertion and reason are true and the reason is the correct explanation of the assertion.
    b) Both assertion and reason are true but the reason is not the correct explanation of the assertion.
    c) Assertion is true, but reason is false.
    d) Both assertion and reason are false

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