19,000+ solved questions for JEE Advanced, JEE Mains, NEET & IChO — with answers and expert explanations.
An oxide of metal (M) has 40% by mass of oxygen. Metal M has atomic mass of 24. The empirical formula of the oxide is
A gas has molecular formula (CH)n. If vapour density of the gas is 39, what should be the formula of the compound?
An organic compound containing C and H has 92.3% of carbon, its empirical formula is
A Compound contains 69.5% oxygen and 30.5% nitrogen and its molecular weight is 92. The molecular formula of compound is
If two compounds have the same empirical formula but different molecular formula, they must have
What is the percentage of carbon, in ethanol?
Mass % of an element A 100 Molar mass of compound x Here, A refers to
If 1021 molecules are removed from 200mg of CO2, then the number of moles of CO2 left are
Which has the highest mass ?
If 1 12 moles of oxygen combine with Al to form Al2O3, the weight of Al used in the reaction is (Al = 27)
Which of the following contains atoms equal to those in 12 g Mg ? (At. wt. Mg = 24)
Which of the following represents 180 g of water correctly? (I) 5 moles of water. (II) 10 moles of water. (III) 6.023 × 1023 molecules of water. (IV) 6.023 × 1024 molecules of water. Choose the correct option.
The mass of 112 cm3 of CH4 gas at STP is
The number of molecules in 89.6 litre of a gas at NTP are :
Number of molecules in 1 litre of oxygen at STP is : (a) 6.02×10 (b) 6.02×10 22.4
M g of a substance when vaporised occupy a volume of 5.6 litre at NTP. The molecular mass of the substance will be :
The number of moles of SO2Cl2 in 13.5 g is :
Choose the wrong statement:
The weight of one molecule of the compound C60H122 is
The number of molecules in 4.25 g of ammonia is about
What is the mass of hydrogen in terms of amu?
What’s the formula mass of NaCl?
‘amu’ has been replaced by ‘u’ which is known as …A… Here, A refers to
Statement I: The constituents of a compound can be separated into simpler substances by physical method. Statement II: The constituents of compound can be separated by chemical method. Choose the correct …
Which of the following 1 g L–1 solution has the highest normality ?