19,000+ solved questions for JEE Advanced, JEE Mains, NEET & IChO — with answers and expert explanations.
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
A molal solution is one that contains one mole of a solute in
Dissolving 120g of urea (mol. wt. 60) in 1000g of water gave a solution of density 1.15 g/mL. The molarity of the solution is
What is the mole fraction of glucose in 10% w/w glucose solution?
Density of a 2.05 M solution of acetic acid in water is 1.02 g/mL. The molality of the solution is
The density of 1 M solution of NaCl is 1.0585g mL– 1. The molality of the solution is
A mixture contains 9 gram each of H O and NaCl, what is the mole fraction of NaCl?
What is the molality of a solution of 10 g NaOH in 500 g water?
A solution is made by dissolving 49 g of H2SO4 in 250 mL of water. The molarity of the solution prepared is
A solution is prepared by adding 2g of a substance A to 18 g of water. Calculate the mass percent of the solute.
The amount of solute in moles per unit volume is_______.
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
An organic compound has an empirical formula CH O . It’s vapour density is 45. The molecular formula of the compound is
The empirical formula of a compound is CH2. One mole of this compound has a mass of 42 g. Its molecular formula is
The simplest formula of a compound containing 50% of an element X (atomic weight 10) and 50% of element Y (atomic weight 20) is :
A compound was found in contain 21.67% Mg, 21.4% C and 57.0% O by mass of oxygen. What is the simplest formula of this compound ?
What is the empirical formula of a compound composed of O and Mn in equal weight ratio?
An oxide of metal (M) has 40% by mass of oxygen. Metal M has atomic mass of 24. The empirical formula of the oxide is
A gas has molecular formula (CH)n. If vapour density of the gas is 39, what should be the formula of the compound?