Some Basic Concepts of Chemistry — NEET PYQ

The number of moles in 46 g of sodium (Na = 23) is:

Avogadro's number is:

Equivalent weight of H₂SO₄ in the reaction H₂SO₄ → 2H⁺ + SO₄²⁻ is:

The empirical formula of a compound with 40% C, 6.7% H, 53.3% O is:

Molarity of a solution containing 4 g NaOH (M = 40) in 500 mL is:

At STP, 22.4 L of any gas contains:

The law of conservation of mass was proposed by:

Molality is defined as:

The percentage of oxygen in Al₂O₃ (Al=27, O=16) is:

In a limiting reagent problem, the reactant that is completely consumed is called:

Number of atoms in 0.5 mole of nitrogen gas (N₂) is:

Normality of 0.5 M H₃PO₄ (tribasic) is:

Gay-Lussac's law states that volumes of gases in reactions are in:

The molecular formula is always a _____ multiple of empirical formula:

Dalton's atomic theory postulates that atoms are:

The mass of 1 molecule of water is:

The SI unit of amount of substance is:

In the reaction 2H₂ + O₂ → 2H₂O, 4 g H₂ reacts with O₂. Mass of water formed:

Mole fraction of solute in a solution of 1 mol solute and 9 mol solvent is:

Significant figures in 0.00340 are: