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Set 8 of 8 · Questions 211-216 of 216

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NEET Chemistry · Metallurgy · Set 8 (Q211-216)

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  1. 211.
    When metal 'M' is treated with NaOH, a white gelatinous precipitate 'X' is obtained, which is soluble in excess of NaOH. Compound 'X' when heated strongly gives an oxide which is used in chromatography as an adsorbent. The metal 'M' is :
    1. (1)Al
    2. (2)Fe
    3. (3)Zn
    4. (4)Ca
  2. 212.
    Extraction of copper by smelting uses silica as an additive to remove :
    1. (1)FeS
    2. (2)FeO
    3. (3)S
    4. (4)O
  3. 213.
    Among the reactions (a)-(d), the reaction(s) that does/do not occur in the blast furnace during the extraction of iron is/are
    (a)
    (b)
    (c)
    (d)
    1. (1)a & b
    2. (2)a,b &c
    3. (3)c &d
    4. (4)
  4. 214.
    Calamine is an ore of :
    1. (1)Zinc
    2. (2)Aluminium
    3. (3)Iron
    4. (4)Copper
  5. 215.
    Cryolite is
    1. (1) and is used in the electrolysis of alumina for lowering the melting point of alumina only
    2. (2) and is used in the electrolytic refining of alumina
    3. (3) and is used in the electrolysis of alumina for decreasing electrical conductivity
    4. (4) and is used in the electrolysis of alumina for lowering the melting point and increasing the conductivity of alumina.
  6. 216.
    The purest form of commercial iron is:
    1. (1)cast iron
    2. (2)scrap iron and pig iron
    3. (3)pig iron
    4. (4)wrought iron