19,000+ solved questions for JEE Advanced, JEE Mains, NEET & IChO — with answers and expert explanations.
A gaseous mixture contains oxygen and nitrogen in the ratio of 1 : 4 by weight. Therefore, the ratio of their number of molecules is
How many moles of magnesium phosphate, Mg3 (PO4)2 will contain 0.25 mole of oxygen atoms ?
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.
Which of the following gases will have the least volume if 10 g of each gas is taken at same temperature and pressure?
The mass of one mole of a substance in grams is called its …A… Here, A refers to
Given that the abundances of isotopes 54Fe, 56Fe and 57Fe are 5%, 90% and 5%, respectively, the atomic mass of Fe is
Calculate the molecular mass of sucrose (C12H22O11) molecule?
In 1811, Avogadro proposed that equal volumes of gases at the same …A… and …B… should contain equal number of molecules. Here, A and B refer to
The Gay Lussac’s law was explained properly by the work of …A… in 1811. Here, A refers to
Which law states that if two elements can combine to form more than one compound, the masses of one element that combine with a fixed mass of other element, are in the ratio of small whole number?
Which law states that matter can neither be created nor destroyed?
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
25 mL of a solution of Ba(OH)2 on titration with a 0.1 M solution of HCl gave a titre value of 35 mL. The molarity of barium hydroxide solution was
Assertion :When a solution is diluted from volume V1 to V2 by adding solvents, its molarity before dilution M1 and after dilution M2 are related as : M1V1 = M2V2 Reason:During dilution, moles of the solute remains co…
A standard solution of 0.165 M HCl is being used to determine the concentration of an unknown NaOH solution. If 25.5 mL of an acid solution are required to neutralize 15.0 mL of the base, what is the mo…
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
Molarity equation of a mixture of solutions of same substance is given by (a) M V M V M V ... M M M x x x x (b) M V M V M V ... M V V V (c) M M M ... M V V V V V V (d) M M M ... M V V V V V V …
Assertion (A) Molarity of a solution depends upon temperature. Reason (R) Volume of a solution is temperature dependent entity.