19,000+ solved questions for JEE Advanced, JEE Mains, NEET & IChO — with answers and expert explanations.
The weight of one molecule of the compound C₆₀H₁₂₂ is
The number of molecules in 4.25 g of ammonia is about
How many H₂O molecules are in a 0.10g sample of CuSO₄.5H₂O (M = 249.7) ?
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 ?
Which of the following gases will have the least volume if 10 g of each gas is taken at same temperature and pressure?
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?
A sample of calcium carbonate (CaCO₃) has the following percentage composition: Ca = 40%, C = 12%, O = 48%. If the law of constant proportions is true, then the weight of calcium in 4g of a s…
3 g of a hydrocarbon on combustion in excess of oxygen produces 8.8g of CO₂ and 5.4 g of H₂O. The data illustrates the law of:
Zinc sulphate contains 22.65% Zn and 43.9% H₂O. If the law of constant proportions is true, then the mass of zinc required to give 40g crystals will be :
A sample of CaCO₃ has Ca = 40%, C = 12% and O = 48%. If the law of constant proportions is true, then the mass of Ca in 5 g of CaCO₃ from another source will be :
n g of substance X reacts with m g of substance Y to form p g of substance R and q g of substance S. This reaction can be represented as follows : X + Y = R + S The relation which can be established in the amounts of…
Hydrogen and oxygen combine to form H₂O₂ and H₂O containing 5.93% and 11.2% hydrogen respectively. The data illustrates:
Carbon and oxygen combine to form two oxides, carbon monoxide and carbon dioxide in which the ratio of the weights of carbon and oxygen is respectively 12:16 an 12:32. These figures illustrate the:
Which of the following reaction is not according to the 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?
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?
…A… are formed when atoms of different elements combine in a …B… ratio. Here, A and B refer to
Which of the following has the largest volume ?
Statement I: The temperatures in degree Celsius and degree Fahrenheit are related to each other by the following relationship. º F º C Statement II The temperature on degree Celsius and Kelvin sc…
During the process of electrolytic refining of copper, some metals present as impurity settle as ‘anode mud’. These are
Among the following statements, the incorrect one is:
Consider the following metallurgical processes: (I) Heating impure metal with CO and distilling the resulting volatile carbonyl (b.p. 430C) and finally decomposition at 1500-2000C to get the pure metal (II) Heating th…
Carbonate of which of the following metal does not liberate carbon dioxide on heating: