19,000+ solved questions for JEE Advanced, JEE Mains, NEET & IChO — with answers and expert explanations.
The wt. of NO having the same no. of oxygen atom present in 9.2 gm of is
Which of the following samples contains the smallest no. of atoms?
Which of the following substances contains the greatest mass of chlorine
Which of the following has greatest no. of oxygen atoms
The element A at wt.=75 and B at wt. =32 combine to form a compound X. If 3 mol of B combine with 2 mol of A to give 1 mol of X, the weight of 5 mol of X is
A sample contains 200 atoms of hydrogen, 0.05 gm atom of nitrogen, 1020 gm atom of oxygen. What is the approximate no. of total atoms
Maximum no. of hydrogen atoms are in:
8 g of sulphur is burnt to form \(\mathrm{SO_2}\) which is oxidised by \(\mathrm{Cl_2}\) water. The solution is treated with \(\mathrm{BaCl_2}\) solution. The amount of \(\mathrm{BaSO_4}\) precipitated is
If half mole of oxygen gas combine with Al to form , the weight of Al used in the reaction is:
25.0 ml of HCl solution gave, on reaction with excess solution of . The molarity of HCl solution is
Calcium carbonate reacts with aqueous to give according to the reaction, . The mass of required to react completely with of is
of a hydrocarbon requires of for complete combustion. Calculate value of?
How many gms of copper would be displaced from the copper sulphate solution by adding 27 gm of aluminium
10 moles and of were allowed to react over a suitable catalyst. 10 moles of were formed. The remaining moles of and respectively are:
The density of a sulphuric acid solution that is (molar mass ) by mass will be:
One mole of potassium chlorate is thermally decomposed and excess of aluminium is burnt in the gaseous product. How many mole of aluminium oxide are formed:
If NA is Avogadro’s number, then the number of valence electrons in 4.2 g of nitride ion () is (Given One atom of N has 5 valence electrons)
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:
\(\mathrm{H_2S}\) 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: