19,000+ solved questions for JEE Advanced, JEE Mains, NEET & IChO — with answers and expert explanations.
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.
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
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 :
Choose the wrong statement:
What’s the number of particles in 10 moles of hydrochloric acid? a) 6.022 × 1024 particles b) 6.022 × 1023 particles c) 6.22 × 1023 particles d) 3.22 × 1022 particles
If one mole of ammonia contains “y” number of particles, then how many particles do 1 mole of glucose contain?
According to S.I. system, ______ was used to measure the amount of substance.
The mass of one mole of a substance in grams is called its …A… Here, A refers to
What is the mass of hydrogen in terms of amu?
What’s the formula mass of NaCl?
‘amu’ has been replaced by ‘u’ which is known as …A… Here, A refers to
Statement I: The constituents of a compound can be separated into simpler substances by physical method. Statement II: The constituents of compound can be separated by chemical method. Choose the correct …
Consider the following statements, (I) Mixture may contain the components in any ratio and their composition is variable. (II) Pure substances have fixed composition. (III) The constituents of pure substanc…
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 …
The law of conservation of mass holds good for all of the following except:
If water sample are taken from sea, rivers or lake, they will be found to contain hydrogen and oxygen in the approximate ratio of 1:8. This indicates the law of:
The percentage of copper and oxygen in samples of CuO obtained by different methods were found to be the same. This illustrates the law of