19,000+ solved questions for JEE Advanced, JEE Mains, NEET & IChO — with answers and expert explanations.
The equivalent weight of a metal is 9 and vapour density of its chloride is 59.25. The atomic weight of metal is (DUMET 2008)
Of two oxides of iron, the first contained 22% and the second contained 30% of oxygen by weight. The ratio of weights of iron in the two oxides that combine with the same weight of oxygen is (J&K CET 2008)
How many moles of lead (II) chloride will be formed from a reaction between 6.5 g of PbO and 3.2 g of HCl? (CBSE AIPMT 2008)
Number of atoms of He in 100 u of He (atomic weight of He is 4) are (BCECE 2008)
The maximum number of molecules are present in (BCECE 2008)
Mass of 0.1 mole of methane is (KCET 2008)
An element, X has the following isotopic composition: 200X : 90% 199X : 8.0% 202X : 2.0% The weighted average atomic mass of the naturally occurring element X is closest to (AIPMT 2007)
The crystalline salt Na₂SO₄.xH₂O on heating loses 55.9% of its weight. The formula of crystalline salt is (Kerala CEE 2007)
Gram molecular volume of oxygen at STP is (KCET 2007)
The number of gram molecules of chlorine in 6.02×1025 hydrogen chloride molecule is (KCET 2007)
25 g of MCl₄ contains 0.5 mole chlorine then its molecular weight is (Punjab PMET 2007)
The weight of one molecule of a compound C₆₀H₁₂₂ is (BHU 2007)
Which of the following 1 g L–1 solution has the highest normality ?
10 mL of 0.2 N HCl and 30 mL of 0.1 N HCl together exactly neutralises 40 mL of solution of NaOH, which is also exactly neutralised by a solution in water of 0.61 g of an organic acid.What is…
The vapour density of a chloride of an element is 39.5. The Ew of the elements is 3.82. The atomic weight of the element is
2H₃PO₄ + 3 Ca(OH)₂Ca₃(PO₄)₂ + 6 H₂O Equivalent weight of H₃PO₄ in this reaction is
The normality of 0.3 M phosphorous acid (H₃PO₃) is
50 ml of 10 N H₂SO₄, 25 ml of 12 N HCl and 40 ml of 5N HNO₃ were mixed together and the volume of the mixture was made 1000 ml by adding water. The normality of the resulting solution will be
10 mL of N/2 HCl, 20 mL of N/2 H₂SO₄ and 30 mL N/3 HNO₃are mixed together and solution made to one litre. The normality of the resulting solution is
To neutralize completely 20 mL of 0.1 M aqueous solution of phosphorus (H₃PO₃) acid, the volume of 0.1 M aqueous KOH solution required is
6.023 × 1020 molecules of urea are present in 100 mL of its solution. The concentration of urea solution is
25 mL of a solution of Ba(OH)₂ on titration with a 0.1 M solution of HCl gave a titre value of 35 mL. The molarity of barium hydroxide solution was
Assertion :When a solution is diluted from volume V₁ to V₂ by adding solvents, its molarity before dilution M1 and after dilution M2 are related as : M1V₁ = M2V₂ Reason:During dilution, moles of the solute remains co…
The mass of 112 cm3 of CH₄ gas at STP is
In one molal solution that contains 0.5 mole of a solute, there is (NEET 2022)