19,000+ solved questions for JEE Advanced, JEE Mains, NEET & IChO — with answers and expert explanations.
In which case is number of molecules of water maximum? (NEET 2018)
Suppose elements X and Y combine to form two compounds XY₂ and X3Y₂. When 0.1 mol of XY₂ weighs 10g and 0.05 mol of X3Y₂ weighs 9g, the atomic weights of X and Y are (NEET 2016)
What is the mass of the precipitate formed when 50 mL of 16.9% solution of AgNO₃ is mixed with 50 mL of 5.8% NaCl solution? (Ag = 107.8, N = 14, O = 16, Na = 23, Cl = 35.5) (NEET 2015)
20.0 g of a magnesium carbonate sample decomposes on heating to give carbon dioxide and 8.0g magnesium oxide. What will be the percentage purity of magnesium carbonate in the sample ? (NEET 2015)
A mixture of gases contains H and O gases in the ratio of 1 : 4 (w/w). What is the molar ratio of the two gases in the mixture ? (NEET 2015)
O Thus, 1.0 g Mg reactis with 0.67 . g O But only 0.56g O is available which less than 0.67 g is. Thus, O . is the limiting reagent. MOLE & EQUIVALENT CONCEPT Further, 16g O reacts with 24g of Mg. 0.56g O will react w…
Equal masses of H₂, O₂ and methane have been taken in a container of volume V at temperature 27°C in identical conditions. The ratio of the volumes of gases H₂ : O₂ : methane would be (NEET 2014)
20.0 kg of N₂(g) and 3.0 kg of H₂(g) are mixed to produce NH₃ (g). The amount of NH₃(g) formed is (Kerala CEE 2011)
60g of a compound on analysis produced 24g of carbon, 4g hydrogen and 32g oxygen. The empirical formula of the compound is. (BVP 2010)
The number of atoms in 0.1 mol of a triatomic gas is ( A N =6.022×10 ) (CBSE AIPMT 2010)
A mixture of CaCl₂ and NaCl weighing 4.44 g is treated with sodium carbonate to precipitate all the Ca²⁺ ions as calcium carbonate. The calcium carbonate so obtained is heated strongly to get 0.56 g of CaO. The percen…
Volume of a gas at NTP is 1.12×10–7 cm3. The number of molecules in it is (Manipal 2010)
If 1 mL of water contains 20 drops the number of molecules in a drop of water is (AFMC 2010)
74.5 g of a metallic chloride contain 35.5 g of chlorine. The equivalent weight of the metal is (Manipal 2010)
To dissolve 0.9 g metal, 100 mL of 1N HCl is used. What is the equivalent weight of metal? (MP PMT 2010)
In an experiment, 4 g of M2Ox oxide was reduced to 2.8 g of the metal. If the atomic mass of the metal is 56 g mol–1, the number of O atoms in the oxide is (AFMC 2010)
10 g of hydrogen and 64 g of oxygen were filled in a steel vessel and exploded. Amount of water produced in this reaction will be (AIPMT 2009)
The volume of 2 N H₂SO₄ solution is 0.1 dm3. The volume of its decinormal solution (in dm3) will be (MHT CET 2009)
A bivalent metal has an equivalent mass of 32. The molecular mass of the metal nitrate is (KCET 2009)
The number of molecules in 18 mg of water in terms of Avogadro number NA is (J&K CET 2009)
One atom of an element weighs 1.8 × 10–22 g. Its atomic mass is (Manipal 2009)
A gas mixture contains O₂ and N₂ in ratio of 1:4 by weight. The ratio of their number of molecules is (JIPMER 2008)
1.520 g of hydroxide of a metal on ignition gave 0.995 g of oxide. The equivalent weight of metal is (JCECE 2008)
A metal M of equivalent mass E forms an oxide of molecular formula MxOy. The atomic mass of the metals is given by the correct equation (BCECE 2008)
The equivalent weight of a metal is 9 and vapour density of its chloride is 59.25. The atomic weight of metal is (DUMET 2008)