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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

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