Chemistry Question Bank

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)

Of two oxides of iron, the first contained 22% and the second contained 30% of oxygen by weight. The ratio of weights of iron in the two oxides that combine with the same weight of oxygen is (J&K CET 2008)

How many moles of lead (II) chloride will be formed from a reaction between 6.5 g of PbO and 3.2 g of HCl? (CBSE AIPMT 2008)

Number of atoms of He in 100 u of He (atomic weight of He is 4) are (BCECE 2008)

The maximum number of molecules are present in (BCECE 2008)

Mass of 0.1 mole of methane is (KCET 2008)

An element, X has the following isotopic composition: 200X : 90% 199X : 8.0% 202X : 2.0% The weighted average atomic mass of the naturally occurring element X is closest to (AIPMT 2007)

The crystalline salt Na₂SO₄.xH₂O on heating loses 55.9% of its weight. The formula of crystalline salt is (Kerala CEE 2007)

Gram molecular volume of oxygen at STP is (KCET 2007)