19,000+ solved questions for JEE Advanced, JEE Mains, NEET & IChO — with answers and expert explanations.
The law of multiple proportion is illustrated by
Which of the following reaction is not according to the law of conservation of mass
Who proposed Law of Conservation of Mass?
If 6.3g of NaHCO₃ are added 15.0g CH₃COOH solution, the residue is found to weigh 18.0 g. What is the mass of CO₂ released in the reaction?
One of the statements of Dalton’s atomic theory in given below “Compounds are formed when atoms of different elements combine in a fixed ratio” Which of the following laws is not related to this…
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 matter can neither be created nor destroyed?
What did Dalton’s Theory couldn’t explain?
Which of the following statement is false? (I) Matter consists of indivisible atoms. (II) All the atoms of a given element have identical properties including identical mass. (III) Compounds are formed when atoms of …
Assertion :Density is expressed as g mL–1 whereas specific gravity is dimension less. Reason :Specific gravity is ratio of the masses of solution and solvent.
How many significant figures does 63180 have?
_________is referred to as the closeness of different measurements for the same quantity.
How many significant figures are present in 0.10100 × 103?
Which of the following is the most accurate measurement?
The result of the operation 2.5 × 1.5 should be which of the following on the basis of significant figures?
2.005 has ….A…. significant figures. Here, A refers to
How can we write 232.508 in scientific notation?
Which of the following represents the largest unit?
Which of the following statements(s) is false about the arrangement of particles, in different states of matter?
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…
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 x x Ans. (b) Sol. Molarit…
The density of a solution prepared by dissolving 120g of urea (mol. mass = 60 u) in 1000 g of water is 1.15g/mL. The molarity of this solution is
Mole fraction of ethanol in ethanol - water mixture is 0.25. Hence, percentage concentration of ethanol (C₂H₆O) by weight of mixture is
What is the weight % sulphuric acid in an aqueous solution which is 0.502 M in sulphuric acid? The specify gravity of the solution is 1.07