NEET Chemistry Some Basic Concepts in Chemistry MCQs

An element X has an atomic weight of 40 and a valency of 2. What is its equivalent weight?

If 1.5g of a metal displaces 2g of hydrogen, what is its equivalent weight?

What is the mass of one mole of water ($H_2O$)? (Atomic masses: H = 1u, O = 16u)

How many moles are present in 32g of oxygen gas ($O_2$)? (Atomic mass of O = 16u)

Calculate the number of atoms in 0.5 moles of sulfur (S). (Avogadro's Number = $6.022 imes 10^{23}$)

What is the molar mass of $CO_2$? (Atomic masses: C = 12u, O = 16u)

How many grams are present in 2 moles of methane ($CH_4$)? (Atomic masses: C=12u, H=1u)

If the atomic mass of element X is 20u, what is the mass of 0.25 moles of X?

A metal M forms two oxides, M₂O₃ and MO₂. If 0.5 moles of M₂O₃ and 0.5 moles of MO₂ require 60 mL and 120 mL of 1 N HCl respectively for complete neutralisation, what is the equivalent weight of the metal M?

A mixture of $NaHCO_3$ and $Na_2CO_3$ weighing 1.0 g requires 15 mL of 1 N HCl for complete neutralization. What is the percentage of $Na_2CO_3$ in the mixture? (Atomic weights: Na = 23, C = 12, O = 16, H = 1)