General Princip...

Which of the following statement is true?

For which of the following ores froth floatation method is used for concentration ?

Malachite and azurite are used respectively are : 

Metal used for making joints in jewellery is 

Which of the following metals is sometimes found native in nature ?

The method of zone refining of metals is based on the principle of:

Froth flotation method cannot be employed for the concentration of:

The principle of fractional crystallisation is involved in which one of the following processes?

A solution of $$Na_{2}SO_{4}$$ in water is electrolysed using inert electrodes. The products at the cathode and anode respectively, are:

Which of the following statements is/are correct?
a) In the decomposition of an oxide into oxygen and metal vapour, entropy increases.
b) Decomposition of an oxide is an endothermic change.
c) To make $$\Delta G^{0}$$ negative, temperature should be high enough so that $$T\Delta S^{0}> \Delta H^{0}$$.