Ores and Metallurgy MCQ Questions & Answers in Inorganic Chemistry | Chemistry
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151.
The oil used as frothing agent in froth floatation process is
A
coconut oil
B
castor oil
C
palmitic oil
D
pine oil
Answer :
pine oil
No explanation is given for this question. Let's discuss the answer together.
152.
The metal extracted by leaching with a cyanideis
A
$$Mg$$
B
$$Ag$$
C
$$Cu$$
D
$$Na$$
Answer :
$$Ag$$
Silver ore forms a soluble complex with $$NaCN$$ from which silver is precipitated using scrap zinc.
$$A{g_2}S + 2NaCN \to $$ \[Na\left[ Ag{{\left( CN \right)}_{2}} \right]\xrightarrow{Zn}\] \[\underset{\begin{smallmatrix}
\text{sodargento - cynanide} \\
\text{(soluble) }
\end{smallmatrix}}{\mathop{N{{a}_{2}}\left[ Zn{{\left( CN \right)}_{4}} \right]}}\,+Ag\downarrow \]
153.
The metal oxide reacts with a _________. The oxide is _________ to metal and reducing agent is _________. Net Gibbs energy change is _________.
Alumina, $$A{l_2}{O_3}$$ is a bad conductor of electricity and has very high melting point, so before subjecting to electrolysis, it is mixed with fluorspar $$\left( {Ca{F_2}} \right)$$ and cryolite $$\left( {N{a_3}Al{F_6}} \right),$$ which lower its melting point and make it more conducting. Mainly $${Ca{F_2}}$$ and $${N{a_3}Al{F_6}}$$ are mixed with $$A{l_2}{O_3}$$ for converting $$A{l_2}{O_3}$$ in molten state.
159.
Which of the following is not the correct name of the formula of the ore given with it?
A
$$MgS{O_4} \cdot 7{H_2}O{\text{ - Epsom salt}}$$
B
$$CuC{O_3} \cdot Cu{\left( {OH} \right)_2}{\text{ - Malachite}}$$
C
$$KAlS{i_3}{O_8}{\text{ - Feldspar}}$$
D
$$KCl \cdot MgC{l_2} \cdot 6{H_2}O{\text{ - Dolomite}}$$
$$KCl \cdot MgC{l_2} \cdot 6{H_2}O$$ is carnallite.
160.
When copper pyrites is roasted in excess of air, a mixture of $$CuO + FeO$$ is formed. $$FeO$$ is present as impurity. This can be removed as slag during
reduction of $$CuO.$$ The flux added to form slag is