Which one of the following sets is not correc | vedclass

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Question

(C) Let us analyze the given options based on the chemical composition of the ores:$A$. Cuprite $(Cu_2O)$ and haematite $(Fe_2O_3)$ are both oxide ore

Vedclass · Accepted Answer

Magnetite,malachite - silicate ores

Vedclass · Answer

(C) Let us analyze the given options based on the chemical composition of the ores:$A$. Cuprite $(Cu_2O)$ and haematite $(Fe_2O_3)$ are both oxide ores. This is correctly matched.$B$. Calamine $(ZnCO_3)$ and siderite $(FeCO_3)$ are both carbonate ores. This is correctly matched.$C$. Magnetite $(Fe_3O_4)$ is an oxide ore,and malachite $(CuCO_3 \cdot Cu(OH)_2)$ is a carbonate ore. Neither is a silicate ore. This is not correctly matched.$D$. Sphalerite $(ZnS)$ and fool's gold (pyrite,$FeS_2$) are both sulphide ores. This is correctly matched.Therefore,the set that is not correctly matched is $C$.

List-$I$	List-$II$
$(a)$ Sphalerite	$(i)$ $FeCO_3$
$(b)$ Calamine	$(ii)$ $PbS$
$(c)$ Galena	$(iii)$ $ZnCO_3$
$(d)$ Siderite	$(iv)$ $ZnS$

Which one of the following sets is not correctly matched?

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Match List-$I$ with List-$II$:

List-$I$ List-$II$

$(a)$ Sphalerite $(i)$ $FeCO_3$

$(b)$ Calamine $(ii)$ $PbS$

$(c)$ Galena $(iii)$ $ZnCO_3$

$(d)$ Siderite $(iv)$ $ZnS$

Choose the correct answer from the options given below:

Metals are usually not found as nitrates in their ores. Out of the following two ($I$ and $II$) reasons,which is/are true for the above observation?
$I.$ Metal nitrates are highly unstable.
$II.$ Metal nitrates are highly soluble in water.

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