WB JEE
Chemistry
Some Basic Concepts of Chemistry
Previous Years Questions

How much solid oxalic acid (Molecular weight 126) has to be weighed to prepare 100 ml. exactly 0.1 (N) oxalic acid solution in water?
$${C_6}{H_6}(liq) + {{15} \over 2}{O_2}(g) \to 6C{O_2}(g) + 3{H_2}O(liq)$$ Benzene burns in oxygen according to the above equation. What is the volume...
A metal (M) forms two oxides. The ratio M:O (by weight) in the two oxides are 25:4 and 25:6. The minimum value of atomic mass of M is
1 mL of water has 25 drops. Let N0 be the Avogadro number. What is the number of molecules present in 1 drop of water ? (Density of water = 1 g/mL)...
The mole fraction of a solute in a binary solution is 0.1 at 298 K, molarity of this solution is same as its molality. Density of this solution at 298...
The mole fraction of ethanol in water is 0.08. Its molality is
5 mL of 0.1 M Pb(NO3)2 is mixed with 10 mL of 0.02 M KI. The amount of PbI2 precipitated will be about
Which of the following has the largest number of atoms?
What will be the mass of one atom of 12C?
In the crystalline solid MSO4 . nH2O of molar mass 250 g mol$$-$$1, the percentage of anhydrous salt is 64 by weight. The value of n is ...
At S.T.P. the volume of 7.5 g of a gas is 5.6 L. The gas is
How many moles of electrons will weigh one kilogram?
A metal M (specific heat 0.16) forms a metal chloride with 65% chlorine present in it. The formula of the metal chloride will be
Which of the following has the dimension if [$$M{L^0}{T^{ - 2}}$$] ?
In a flask, the weight ratio of CH4(g) and SO2(g) at 298 K and 1 bar is 1 : 2. The ratio of the number of molecules of SO2(g) and CH4(g) is ...
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