Question

Mark the correct statements.

• A. In a chemical reaction, the electric charge of the ions taking part is conserved.
• B. The reactant which first disappear during a chemical change is called reacting reagent.
• C. A molecular compound may contain molecule or ions.
• D. The amount of atoms, ions or molecules in a sample is expressed in mole.

Answer 1

Answer: (A), (B), (D)

The correct options are
A In a chemical reaction, the electric charge of the ions taking part is conserved.
B The reactant which first disappear during a chemical change is called reacting reagent.
D The amount of atoms, ions or molecules in a sample is expressed in mole.

Consider a reaction:
$A+B\to C+D$
For every reaction total charge in solution remain constant and we take each substance's concentration in mole.
The reactant which takes part in reaction and get consumed first is called limiting reagent.