Zone refining is used for the purification of
A. Au
B. Ge
C. Ag
D. Cu
Answer: Option B
A. Au
B. Ge
C. Ag
D. Cu
Answer: Option B
Which of the following phenomenon is considered responsible for Global Warming?
A. Greenhouse effect
B. Fire in coal mines
C. Dry farming
D. Monsoon
E. Trade winds
The nucleus of an atom consists of
A. electrons and neutrons
B. electrons and protons
C. protons and neutrons
D. All of the above
The number of moles of solute present in 1 kg of a solvent is called its
A. molality
B. molarity
C. normality
D. formality
in silicon and aluminum which one is purification of element