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## Some Basic Concepts of Chemistry

### Chemistry

#### Previous Years Questions

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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 ? ...
WB JEE 2022
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...
WB JEE 2022
$${C_6}{H_6}(liq) + {{15} \over 2}{O_2}(g) \to 6C{O_2}(g) + 3{H_2}O(liq)$$ Benzene burns in oxygen according to the abov...
WB JEE 2022
How much solid oxalic acid (Molecular weight 126) has to be weighed to prepare 100 ml. exactly 0.1 (N) oxalic acid solut...
WB JEE 2022
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. D...
WB JEE 2021
What will be the mass of one atom of 12C?
WB JEE 2020
Which of the following has the largest number of atoms?
WB JEE 2020
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...
WB JEE 2020
The mole fraction of ethanol in water is 0.08. Its molality is
WB JEE 2020
At S.T.P. the volume of 7.5 g of a gas is 5.6 L. The gas is
WB JEE 2019
In the crystalline solid MSO4 . nH2O of molar mass 250 g mol$$-$$1, the percentage of anhydrous salt is 64 by weight. Th...
WB JEE 2019
A metal M (specific heat 0.16) forms a metal chloride with 65% chlorine present in it. The formula of the metal chloride...
WB JEE 2018
How many moles of electrons will weigh one kilogram?
WB JEE 2018
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 S...
WB JEE 2017
Which of the following has the dimension if [$$M{L^0}{T^{ - 2}}$$] ?
WB JEE 2017

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