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Calamine is...

Calamine is

A

`BaCO_(3)`

B

`ZnCO_(3)`

C

`ZnS`

D

`ZnO`

Text Solution

Verified by Experts

The correct Answer is:
B
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(1) Metals occur in the native form because of their (a) High electronegativity (b) Low reactivity ( c) Low density (d) High reactivity (2) Specific gravity of slag is (a) Higher than molten metal (b) Same as that of molten metal ( c) Less as that of molten metal (d) None of the above (3) Which process is used for the extraction of metals from their sulphide ores ? (a) Smelting Froth flotation ( c) Electrolysis (d) Metal displacement (4) Calamine is an ore of (a) Hg (b) Zn ( c) Ca (d) Cd (5) Non-fusible impurities of ores removed by adding Slag (b) Flux ( c) Gangue (d) None (6) Common method of extraction of metals from oxide ore involves. (a) Reduction with aluminium (b) Reduction with carbon Reduction with hydrogen (d) Electrolytic method (7) Smelting is the reduction of oxide to metal by (a) Carbon (b) Hydrogen ( c) Aluminimum (d) Electric current During froth flotation process, commonly used frother is. (a) CuSO_(4) (b) NaCN + alkali ( c) Pine oil (d) Potassium xanthate (9) Iron ores are dressed by (a) Froth flotation process (b) Hand picking ( c) Magnetic separation (d) All of the above (10) Silicon is the main constituent of (a) Alloys (b) Rocks ( c) Animals Plants.

Explain why: Calamine solution is applied on the skin when an ant bites.

Knowledge Check

  • Consider the following statement: Statement-1: In extraction of iron from haematite ore, the reduction reactions take place only in the lower temperature range in the blast furnace. Statement-2:Calamine is an carbonate ore of zinc. ltbr Statement-3: The principle opre of aluminium, bauxite, usually contains silica, iron oxides and titanium, oxide as impurities. Statement-4:Solidified copper obtained from silica lined convertor (Bessemer converter) has blistered appearance due to the evolution of SO_(2) and arrange in the order of true/false.

    A
    FTTT
    B
    FTFF
    C
    FFTT
    D
    TFFT

  • The total number of carbonate ores among the following is . ltBRgt (i) Argentite (ii) Calamine (iii) Malachite (iv) Siderite (v) Galena (vi) Magnetite (vii) Dolomite (viii) Cassiterite (ix) Bauxite

    A
    4
    B
    5
    C
    6
    D
    7

  • Read the following examples from daily life and select the appropriate option: A. When food gets spoiled, it produces a foul smell. B. A slice of apple acquires brown colour when kept out for some time. C. When an ant bites, calamine is used to ease the irritation on skin.

    A
    All are chemical changes
    B
    A and B represent chemical changes
    C
    B is a physical change
    D
    A and B are physical changes

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    The total number of carbonate ores among the following is . (i)Argenitie (ii)Calamine (iii)Malachite (iv)Siderite (v)Galena (vi)Magnetite (vii)Dolomite (viii)Cassiterite (ix)Bauxite

    Calamine and Malachite respectively are ores of

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