A compound that gives a brick-red colour to a non-luminous flame is likely to contain
copper ions
sodium ions
calcium ions
Potassium ions
Correct answer is C
No explanation has been provided for this answer.
In the electrolytic extraction of calcium from calcium chloride, the cathode is
zinc
graphite
platinum
iron
Correct answer is D
No explanation has been provided for this answer.
In the extraction of sodium from fused sodium chloride, the anode is made of platinum because
sodium is formed at the anode
chlorine is formed at the anode
sodium does not react with platinum
chlorine does not react with platinum
Correct answer is D
Because platinum is resistant to chlorine and water, hence in the electrolytic process, it doesn't react with any chemical and we get pure products.
Fluorine does not occur in the free state in nature because
it is a poisonous gas
it belongs to the halogen family
it is inert
of its high reactivity
Correct answer is D
No explanation has been provided for this answer.
In a chemical reaction, the change in concentration of a reactant with time is
entropy of reaction
enthalpy of reaction
rate of reaction
order of reaction
Correct answer is C
No explanation has been provided for this answer.