Mock Test 1 — Some Basic Concepts of Chemistry

The number of moles in $11$ g of CO₂:

The volume of $0.1$ mol of any gas at STP:

$12$ g of magnesium reacts with HCl to give H₂ at STP. Volume of H₂:

Mole fraction of ethanol ($C_2H_5OH$) in water if $46$ g of ethanol is in $54$ g of water:

The empirical formula of a compound with $40\%$ S and $60\%$ O is:

Equivalent weight of KMnO₄ in acidic medium ($M = 158$):

Oxidation state of N in NH₄NO₃:

Molarity of pure water is approximately:

Number of atoms of oxygen in $0.5$ mol of CaCO₃:

The mass of $0.5$ mole of $H_2SO_4$:

Number of moles in $44$ g of CO₂:

ON of Cl in HClO₄:

If $4$ mol HCl reacts with $3$ mol NaOH, the moles of unreacted reactant (integer):

Assertion (A): Molality is preferred over molarity for studying physical properties dependent on temperature. Reason (R): Molality depends only on masses, so does not change with temperature.

Assertion (A): In a redox reaction, the oxidizing agent gets reduced. Reason (R): Oxidizing agent gains electrons, thereby reducing its own oxidation number.