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1. The chemical formula of Dolomite is ...... (NTSE Andhra Pradesh, Stage-I, 2012-13)
Be3AI2(Si03)6
MgCI2·KCI.6H2O
CaC03.MgC03
MgS04·7H2O
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2. Which of the following statements is correct? (i) German silver is an alloy of silver, copper and zinc. (ii) There is no zinc in brass. (iii) Bronze is an alloy of copper and tin. (NTSE Panchkula, Chandigarh, Stage-I, 2012-13)
(i), (ii) & (iii)
Only (iii)
(i) & (iii)
(i) & (ii)
3. Among the following compounds, which one is used in cooling refrigerators? (NTSE West Bengal, Stage-I, 2013-14)
NH4CI
CO2
NH40H
Liquid NH3
4. From the following metals whose nitrate produces N02 gas on heating? (NTSE West Bengal, Stage-I, 2013-14)
Na
K
Pb
None of these
5. Which of the following cannot be used to extract a metal from its ore? (NTSE West Bengal, Stage-I, 2013-14)
Electrolytic reduction
Carbon reduction
Reaction with oxygen
Reaction with a more electropositive metal
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