19,000+ solved questions for JEE Advanced, JEE Mains, NEET & IChO — with answers and expert explanations.
The density of 2 M aqueous solution of NaOH is 1.28 g/cm3. The molality of the solution is [Given that molecular mass of NaOH = 40 g mol–1] (Odisha NEET 2019)
The number of moles of hydrogen molecules required to produce 20 moles of ammonia through Haber’s process is (NEET 2019)
Which of the following is dependent on temperature? (NEET 2017)
The number of water molecules is maximum in (NEET 2015)
If Avogadro number NA, is changed from 6.022 × 1023 mol–1 to 6.022 × 1020 mol–1, this would change (NEET 2015)
6.02 × 1020 molecules of urea are present in 100 mL of its solution. The concentration of solution is (NEET 2013)
The vapour density of a gas is 11.2. The volume occupied by one gram of the gas at STP is (Manipal – 2013)
Which one of the following data has only four significant figures? (Kerala CEE 2014)
5.6 g of a metal forms 12.7 g of metal chloride. Hence equivalent weight of the metal is
0.115 g of pure sodium metal was dissolved in 400 ml distilled water. The normality of the above solution
The final molarity of a solution made by mixing 50 mL of 0.5 M HCl, 150mL of 0.25 M HCl and water to make the volume 250 mL is
Assertion (A) Molarity of a solution depends upon temperature. Reason (R) Volume of a solution is temperature dependent entity.
The molarity of a solution obtained by mixing 750 mL of 0.5 M HCl with 250 ml of 2 M HCl will be
In which mode of expression, the concentration of a solution remains independent of temperature ?
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
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 prepared by adding 2g of a substance A to 18 g of water. Calculate the mass percent of the solute.
The concentration of a solution or the amount of substance present in its given volume can be expressed in any of the following ways.
0 3 . x x
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
If two compounds have the same empirical formula but different molecular formula, they must have
What is the percentage of carbon, in ethanol?
The ratio of masses of oxygen and nitrogen in a particular gaseous mixture is 1: 4. The ratio of number of their molecule is :