Chemistry MCQs for NEET — Practice Questions with Answers

$ [ M.V = M_1 . V_1 + M_2. V_2 + M_3 V_3 , V = V_1 + V_2 + V_3 ] $ $ \therefore M .2600 = 0.3 \times 1400 + 0.4 \times 700 + 1.2 \times 500 $ $ \therefore M = 0.5 $

A 10% w/w (weight by weight) KOH solution means 10 grams of KOH per 100 grams of solution. For a 1000 gram solution, the required amount of KOH is 10% of 1000 = 100 grams.

$ M_1 V_1 = M_2 V_2 5000 ml = 5 lit $ $ 1.5 \times 5 = 0.5 \times V_2 $ $ \therefore V_2 = 15 lit $ $ \therefore Amount of water added = 15 - 5 = 10 lit $

The solubility of a gaseous solute in a liquid depends on temperature, pressure of the gas, and the nature of the gaseous solute and solvent. All these factors play a role in determining the solubility.

According to Henry's law constant,' for a given external pressure of a gas, its solubility is inversely proportional to Henry's law constant,i.e, higher the value of KH​, lower the solubility.

S∝KH​1​

Henry law constant for helium is highest and lowest for oxygen. The order is :

He>N2​>H2​>O2​

Hence, option D is correct.

The van't Hoff factor (i) for K₄[Fe(CN)₆] is 5, as it dissociates to form 5 ions in solution. The salt Al₂(SO₄)₃ also has a van't Hoff factor of 5, as it dissociates to form 1 Al₂(SO₄)₃ and 3 SO₄²⁻ ions, making a total of 5 ions.