19,000+ solved questions for JEE Advanced, JEE Mains, NEET & IChO — with answers and expert explanations.
In an experiment, 4 g of M2Ox oxide was reduced to 2.8 g of the metal. If the atomic mass of the metal is 56 g mol–1, the number of O atoms in the oxide is (AFMC 2010)
10 g of hydrogen and 64 g of oxygen were filled in a steel vessel and exploded. Amount of water produced in this reaction will be (AIPMT 2009)
The volume of 2 N H2SO4 solution is 0.1 dm3. The volume of its decinormal solution (in dm3) will be (MHT CET 2009)
A bivalent metal has an equivalent mass of 32. The molecular mass of the metal nitrate is (KCET 2009)
The number of molecules in 18 mg of water in terms of Avogadro number NA is (J&K CET 2009)
One atom of an element weighs 1.8 × 10–22 g. Its atomic mass is (Manipal 2009)
A gas mixture contains O2 and N2 in ratio of 1:4 by weight. The ratio of their number of molecules is (JIPMER 2008)
1.520 g of hydroxide of a metal on ignition gave 0.995 g of oxide. The equivalent weight of metal is (JCECE 2008)
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)
5.6 g of a metal forms 12.7 g of metal chloride. Hence equivalent weight of the metal is
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
0.115 g of pure sodium metal was dissolved in 400 ml distilled water. The normality of the above solution
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…