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ISC Class XII Sample / Model Paper 2021 : Mathematics

27 pages, 90 questions, 0 questions with responses, 0 total responses,

Devamanoharan Chitharanjan
The Vikasa School, Thoothukudi

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Some Basic Concept of Chemistry 1. 2.4 g of pure Mg (at. mass = 24) is dropped in 100 mL of 1M HCl. Which of the following statement is wrong? (A) 1.12 L of hydrogen is produced at S.T.P. (B) 0.01 mol of magnesium is left behind (C) HCl is the limiting reagent. (D) None of these Answer: [A] 800 g of solution has X = 320 g = Solvent in solution 800 = 230 480 g = X left after cooling 320 = 100 220 g Total weight of solution 2. In the reaction 3Cu + 8HNO3 3Cu(NO3 )2 + 2NO + 4H2O, equivalent weight of (A) M (B) = 480 + 220 = 700 g M 3 HNO3 ? what is the if molecular weight of (C) 3 M 4 (D) HNO3 is M 4 M 3 Answer: [D] 1

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