Calamine is...

Calamine is

`ZnCO_3`

`CaCO_3`

`MgCO_3`

`CaCO_3 + MgCO_3`

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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.

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

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

Calamine and Malachite respectively are ores of

Calamine and Malachite, respectively, are the ores of

MARVEL PUBLICATION-D AND F BLOCK ELEMENTS -TEST YOUR GRASP

The most abundant transition metal is
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Which one of the following pair of ions are isoelectronic?
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Calamine is
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Inner transition elements belongs to which block of the periodic table...
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Which of the following elements is / are Ianthan ides?
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Which of the following is a chemical twins?
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In inner transition elements, which f subshell gets filled up with el...
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Which of the following ion of Ianthan ides is / are coloured?
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La^(+3) and Lu^(+3) have their ionic radii 'a' and 'b' respectively, t...
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Which lanthanide element does not occur in nature ?
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For, both lanthanides and actinides, which of the following statement ...
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In which of the following pairs, tripositive ions of both will have s...
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Ionic radius of La^(+3) is 106 pm, ionic radius of Lu^(+3) be
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The most common oxidation state of lanthanoids is
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Which of the following elements belong to actinoid series?
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Which element among the Ianthanoids has the smallest atomic radius ?
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The properties of Zr and Hf are similar because
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Which of the following statement/s is / are true?
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Which of the following statement/s is / are true ?
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Element with following accepted electronic configuration [Rn] 5f^7 6d^...
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