19,000+ solved questions for JEE Advanced, JEE Mains, NEET & IChO — with answers and expert explanations.
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…
The number of moles of SO₂Cl₂ in 13.5 g is :
Cupellation process is used in the metallurgy of: (AIPMT 2011)
The following reactions take place in the blast furnace in the preparation of impure iron. Identify the reaction pertaining to the formation of the slag. (AIPMT 2011)
The correct order of the abundance of the elements in earth’s crust is (AIMPT 2011)
In the extraction of copper from its sulphide ore, the metal is finally obtained by the reduction of cuprous oxide with? (AIPMT 2012)
Aluminium is extracted from alumina (Al₂O₃) by electrolysis of a molten mixture of (AIPMT 2012)
Roasting of sulphides give the gas X as a by-product. This is a colourless gas with choking smell of burnt sulphur and causes great damage to respiratory organs as a result of acid rain. Its aqueous solution is acidic…
The metal oxide which cannot be reduced to metal by carbon is (Karnataka NEET 2013)
The ore of aluminium is (UP CPMT 2013)
Which one is malachite from the following? (NEET 2015) (a) 2 Cu OH (b) Fe O (c) CuCO .Cu OH (d) CuFeS
In the extraction of copper from its sulphide ore, the metal is finally obtained by the reduction of cuprous oxide with (NEET 2016)
Match items of Column I with the items of Column II and assign the correct code : (NEET-I 2016) Column I Column II