Some Basic Concepts of Chemistry

JEE Main 2024 (Online) 29th January Morning ShiftNumericalEasy📈 Topic in 24% papers+4

Ques. 1JEE Main 2024, 29 January (Morning Shift)

A solution of H2SO4 is 31.4% H2SO4 by mass and has a density of 1.25 g/mL. The molarity of the H2SO4 solution is M (nearest integer) [Given molar mass of H2SO4 = 98 g mol-1]

Answer

Solution

Take 100 g solution ⇒ 31.4 g H2SO4 = 31.498 = 0.3204 mol

Volume = 100 g1.25 g mL-1 = 80 mL

M = 0.320480 1000 = 4.005 4

Answer: 4

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Ques. 2JEE Main 2024, 29 January (Evening Shift)

If 50 mL of 0.5 M oxalic acid is required to neutralise 25 mL of NaOH solution, the amount of NaOH in 50 mL of given NaOH solution is g.

Ques. 3JEE Main 2024, 27 January (Morning Shift)

Mass of methane required to produce 22 g of CO2 after complete combustion is g. (Given Molar mass in g mol-1 C = 12.0, H = 1.0, O = 16.0)

Ques. 4JEE Main 2024, 27 January (Evening Shift)

Volume of 3M NaOH (formula weight 40 g mol-1) which can be prepared from 84 g of NaOH is 10-1dm3.

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