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IIT JEE Exam 2025 : chemistry

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Time: 30 min XI Chemistry Worksheet Ch#1 : Some Basic Concepts of Chemistry -01 Full Marks: 20 Instructions: 1. All questions are compulsory. 2. Please give the explanation for the answer where applicable. Q1 - What is the mass of 3 gram atoms of calcium? (1 Mark) Q2 -Calculate the mass of CaCO3 which is required to react with 25 ml of 0.75 M HCl. (5 Marks) Q3 - During preparation of ammonia by Haber s process 30 L of H2 and 30 L of N2 are mixed. The yield of NH3was 50%. Find the composition of gaseous mixtures. (3 Marks) Q4 -Potassium bromide (KBr) contains 32.9% potassium by mass. If 6.40 g of Br2 is made to react with 3.60 g of potassium, find the actual mass of potassium which reacts with bromine. (2 Marks) Q5 - One atom of an element weighs 1.8 x 10 -22 g . What is the atomic mass of element? (1 Mark) Q6 -Chlorophyll contains 2.7% of Magnesium by mass.The number of magnesium atoms present in 4.00g of chlorophyll is (3 Marks) Q7 - How much water is required to dilute 10 ml of 10 N hydrochloric acid to make it exactly decinormal? (2 Marks) Q8 - Find the molarity of solution prepared by dissolving 4g of NaOH in 3L of solution. (2 Marks) Q9 - How many molecules are present in 1 kg mole? (1 Mark)

 

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