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Some Basic Concepts of Chemistry

Chemistry

Previous Years Questions

MCQ (Single Correct Answer)

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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...
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$${C_6}{H_6}(liq) + {{15} \over 2}{O_2}(g) \to 6C{O_2}(g) + 3{H_2}O(liq)$$ Benzene burns in oxygen according to the abov...
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How much solid oxalic acid (Molecular weight 126) has to be weighed to prepare 100 ml. exactly 0.1 (N) oxalic acid solut...
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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?
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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...
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The mole fraction of ethanol in water is 0.08. Its molality is
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