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)
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 density of a solution prepared by dissolving 120g of urea (mol. mass = 60 u) in 1000 g of water is 1.15g/mL. The molarity of this solution is
The molarity of a solution obtained by mixing 750 mL of 0.5 M HCl with 250 ml of 2 M HCl will be
Mole fraction of ethanol in ethanol - water mixture is 0.25. Hence, percentage concentration of ethanol (C2H6O) by weight of mixture is
What is the weight % sulphuric acid in an aqueous solution which is 0.502 M in sulphuric acid? The specify gravity of the solution is 1.07
What is the molarity of S O ion in aqueous solution that contain 34.2 ppm of Al2(SO4)3 ? (Assume complete dissociation and density of solution 1 g/mL)
An antifreeze mixture contains 40% ethylene glycol (C2H6O2) by weight in the aqueous solution. If the density of this solution is 1.05 g/mL, what is the molar concentration?
The density (in g mL–1) of a 3.60 M sulphuric acid solution that is 29% H2SO4 (molar mass = 98 g mol-1) by mass will be MOLE & EQUIVALENT CONCEPT
What volume of 0.4 M FeCl3 . 6H2O will contain 600 mg of Fe3+ ?
According to the law of conservation of mass …A… has the same number of atoms of each element on both sides of the equation. Here, A refers to
Determine the empirical formula of Kelvar, used in making bullet proof vests, is 70.6% C, 4.2% H, 11.8% N and 13.4% O