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  4. Which one of the following ores is best concentrated by froth flotation method?

Q. Which one of the following ores is best concentrated by froth flotation method?

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Solution:

Froth flotation method is used for concentration of sulphide ores.
Galena $\rightarrow P b S$
Malachite is $Cu _2\left( CO _3\right)_2( OH )_2$
Magnetite is $Fe _3 O _4$
Siderite is $FeCO _3$

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4. At standard conditions, if the change in the enthalpy for the following reaction is $-109 \,kJ\, mol^{-1}$ $H_{2(g)}+Br_{2(g)} \to 2HBr_{(g)}$ Given that bond energy of $H_{2}$ and $Br_{2}$ is $435\,KJ\,mol^{-1}$ and $192\,KJ\,mol^{-1}$ , respectively, what is the bond energy (in $KJ \,mol^{-1})$ of $HBr$ ?

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5. The density of 2 M aqueous solution of NaOH is 1.28 g/cm$^3$. The molality of the solution is
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