Some Basic Concepts of Chemistry - 2 - JEE MCQ

The largest number of molecules is in -

In an ionic compound moles ratio of cation to anion is 1 : 2. If atomic masses of metal and non-metal respectively are 138 and 19, then
correct statement is -

The number of atoms of Cr and O are 4.8 × 10¹⁰ and 9.6 × 10¹⁰ respectively. Its empirical formula is  -
 

Iron forms two oxides, in first oxide 56 gram. Iron is found to be combined with 16 gram oxygen and in second oxide 112 gram iron is
found to be combined with 48 gram oxygen. This data satisfy the law of -
 

0.2 mole of HCl and 0.1 mole of barium chloride were dissolved in water to produce a 500-mL solution. The molarity of the Cl^– ions is -

A vessel contains 8 gram TiO₂, 2.4 gram carbon and 28.4 gram Cl₂. Maximum mass of TiCl₄ which can be produced is -
3TiO₂(s) + 4C(s) + 6Cl₂(g) → 3TiCl₄(g) + 2CO₂(g) + 2CO(g)
(Consider reaction goes to completion ; atomic mass of Ti = 48)

The mole fraction of a given sample of I₂ in C₆H₆ is 0.2. The molality of I₂ in C₆H₆ is -

The number of molecules present in 88 g of CO₂ (Relative molecular mass of CO₂ = 44)

When 20 ml of pure acetic acid (density = 0.75 gm ml^–1) is mixed with 50 gm of water (density = 1gm ml^–1) at a certain temperature. Calculate the molality of acetic acid in the final solution.

If N_A is Avogadro number, then the number of valence electrons in 4.2 g of N^3– ions is -

12g of Mg (atm. mass 24) will react completely with acid to give -

The iron atoms in 1720 amu of ferric ferrocyanide is .....................
 

When 20 ml of pure acetic acid (density = 0.75 gm ml^–1) is mixed with 50 gm of water (density = 1gm ml^–1) at a certain temperature. Calculate the molality of acetic acid in the final solution.

Calculate percentage change in M_avg of the mixture, if PCl₅ undergo 50% decomposition.

PCl₅ → PCl₃ + Cl₂

Molarity of aqueous NaOH solution will be, if mole fraction of NaOH in the solution is 0.5. [Given : density of pure NaOH = 4 gm/ml]

2 moles of Al react with 3 moles of Cl₂ to form AlCl₃​. What will be the limiting reagent, and how many moles of AlCl_3​ will be formed?

A compound contains 50% sulfur and 50% oxygen by mass. What is the empirical formula of the compound?

A sample contains 3 mol of N₂ and 2mol of H₂​. What is the total number of molecules in the sample?