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5 g of NaOH was dissolved in deionized water to prepare a 450 mL stock solution. What volume (in mL) of this solution would be required to prepare 500 mL of 0.1 M solution ? Given : Molar Mass of Na, O and H is 23, 16 and 1 g mol1 respectively

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Important Questions on Some Basic Concepts of Chemistry

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Uracil is base present in  RNA  with the following structure. % of N in uracil is _______.

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The number of units, which are used to express concentration of solutions from the following is _________.

(Mass percent, Mole, Mole fraction, Molarity, ppm, Molality.)

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IMPORTANT
The density of a monobasic strong acid (Molar mass 24.2 g mol) is 1.21 kg L. The volume of its solution required for the complete neutralization of 25 mL of 0.24 M NaOH is 10-2 mL (Nearest integer)
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In sulphur estimation. 0.471 g of an organic compound gave 1.4439 g of barium sulphate. The percentage of sulphur in the compound is _______(Nearest Integer)

(Given: Atomic mass Ba: 137u:S:32u,O:16u )

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What is the mass ratio of ethylene glycol (C2H6O2, molar mass =62 g/mol) required for making 500 g of 0.25 molal aqueous solution and 250 mL of 0.25 molar aqueous solution?
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JEE Main
IMPORTANT
Number of hydrogen atoms per molecule of a hydrocarbon A having 85.8% carbon is (Given : Molar mass of A=84 g mol-1 )
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When a hydrocarbon A undergoes combustion in the presence of air, it requires 9.5 equivalents of oxygen and produces 3 equivalents of water. What is the molecular formula of A?
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JEE Main
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The volume of HCl, containing 73g L-1, required to completely neutralise NaOH obtained by reacting 0.69 g of metallic sodium with water, is _____ mL. (Nearest Integer)

(Given : molar Masses of Na,Cl,O,H are 23,35.5,16 and 1g mol-1 respectively)