Chemistry · JEE

Medium Mole concept, molar mass, percentage composition, empirical and molecular formulae MCQs for JEE

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Q1ChemistryUnit 1: Some Basic Concepts in Chemistry
What is molecular formula of oleum?
Q2ChemistryUnit 1: Some Basic Concepts in Chemistry
The volume of 0.5 moles of a gas at 273 K\mathrm{K} and 380mm380 \mathrm{mm} pressure is:
Q3ChemistryUnit 1: Some Basic Concepts in Chemistry
The number of significant figures in N0=6.022×1023N_{0}=6.022 \times 10^{23} i.e., Avogadro's number, is :
Q4ChemistryUnit 1: Some Basic Concepts in Chemistry
380mL380 \mathrm{mL} of a gas at 270C,800mm27^{0} \mathrm{C}, 800 \mathrm{mm} of Hg\mathrm{Hg} weight 0.455g.0.455 \mathrm{g} . the mol.wt.of gas is:
Q5ChemistryUnit 1: Some Basic Concepts in Chemistry
Which of the following contains maximum number of atoms?
Q6ChemistryUnit 1: Some Basic Concepts in Chemistry
A metal M of atomic weight 54.94 g has a density of 7.42 g/cc. The apparent volume occupied by one atom of the metal will be:
Q7ChemistryUnit 1: Some Basic Concepts in Chemistry
If repeated measurements give values close to one another, the number is:
Q8ChemistryUnit 1: Some Basic Concepts in Chemistry
The number of moles of sodium oxide in 620 g of it is:

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