19,000+ solved questions for JEE Advanced, JEE Mains, NEET & IChO — with answers and expert explanations.
The mass of carbon present in 0.5 moles of \(\mathrm{K_4FeCN}\) is
The no. of electrons in 2 gm ion of nitrate ion \(\mathrm{NO_3}\) is
The no. of atoms in 52 a.m.u. of He is
Which one of the following samples contains the largest number of atoms.
Which of the following has the highest mass
The molecular wt. of green vitriol is \(\mathrm{M_0}\) The wt. of 103 NA molecules of it is
In which of the following pairs both members have same no. of atoms
Total no. of protons in 36 ml of water at 4°C (where of water = 1 g/ml) is
3 mol of ammonia contains:
Choose the wrong statement:-
The number of moles of \(\mathrm{H_2}\) in 0.224 litre of hydrogen gas at NTP is:
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: