19,000+ solved questions for JEE Advanced, JEE Mains, NEET & IChO — with answers and expert explanations.
The molecular mass of \(\mathrm{CO_2}\) is 44 amu and Avogadro’s number is 6.02 × 1023. Therefore, the mass of one molecule of \(\mathrm{CO_2}\) is:
19.7 kg of gold was recovered from a smuggler. The atoms of gold recovered are: (Au = 197)
At NTP 1.0 g of hydrogen gas has volume in litre:
The number of grams of \(\mathrm{H_2SO_4}\) present in 0.25 mole of \(\mathrm{H_2SO_4}\) is
Which of the following has the smallest number of molecules?
The number of atoms in 1.4 g nitrogen gas is:
1.0 mole of \(\mathrm{CO_2}\) contains:
The weight of a molecule of the compound \(\mathrm{C_60H_122}\) is
7.5 grams of a gas occupy 5.6 litres of volume at STP. The gas is
Two containers P and Q of equal volume (1 litre each) contain \(\mathrm{O_2}\) and \(\mathrm{SO_2}\) respectively at 300 K and 1 atmosphere. Then
The chemical formula of a particular compound represents:
The best standard of atomic mass is:
Irrespective of the source, pure sample of water always yields 88.89% mass of oxygen and 11.11% mass of hydrogen. This is explained by the law of:
\(\mathrm{H_2S}\) contains 5.88% hydrogen, \(\mathrm{H_2O}\) contains 11.11% hydrogen while \(\mathrm{SO_2}\) contains 50% sulphur. These figures illustrate the law of:
Potassium combines with two isotopes of chlorine (35Cl and 37Cl) respectively to form two samples of KCl. Their formation follows the law of: