19,000+ solved questions for JEE Advanced, JEE Mains, NEET & IChO — with answers and expert explanations.
The mole fraction of a given sample of I2 in C H is 0.2. The molality of I2 in C6H6 is
An aqueous solution of ethanol has density 1.025 g/mL and it is 2 M. What is the molality of this solution ?
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 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
Assertion :Pure water obtained from different states of India always contains hydrogen and oxygen in the ratio of 1 : 8 by mass. Reason: Total mass of reactants and products during chemical change is always the same.
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.
The amount of solute in moles per unit volume is_______.
NH3 is produced according to the following reaction: N2(g) + 3H2(g) -> 2NH3(g) In an experiment 0.25 mol of NH3 is formed when 0.5 mol of N2 is reacted with 0.5 mol of H2. What is % yield ?
60g of a compound on analysis produced 24g of carbon, 4g hydrogen and 32g oxygen. The empirical formula of the compound is. (BVP 2010)
The weight of 1 × 1022 molecules of CuSO4. 5H2O is
Which has maximum number of atoms?
The ratio of masses of oxygen and nitrogen in a particular gaseous mixture is 1: 4. The ratio of number of their molecule is :
The number of water molecules present in a drop of water (volume = 0.0018 ml) at room temperature is (density of H2O = 1 g/mL)
The largest number of molecules is in
Rearrange the following I to IV in order of increasing masses and choose the correct answer [At. wt. of N = 14 u, O = 16 u, Cu = 63 u] I 1 molecule of oxygen II 1 atom of nitrogen III 1 × 10–10mol molecule of oxygen…
Which among the following is the heaviest?
If NA is Avogadro’s number then number of valence electrons in 4.2 g of nitride ions (N3–) is