19,000+ solved questions for JEE Advanced, JEE Mains, NEET & IChO — with answers and expert explanations.
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:
If one mole of ammonia contains “y” number of particles, then how many particles do 1 mole of glucose contain?
According to S.I. system, ______ was used to measure the amount of substance.
Which of the following gases will have the least volume if 10 g of each gas is taken at same temperature and pressure?
The mass of one mole of a substance in grams is called its …A… Here, A refers to
Given that the abundances of isotopes 54Fe, 56Fe and 57Fe are 5%, 90% and 5%, respectively, the atomic mass of Fe is
Calculate the molecular mass of sucrose (C12H22O11) molecule?
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‘amu’ has been replaced by ‘u’ which is known as …A… Here, A refers to
Which law states that matter can neither be created nor destroyed?
What did Dalton’s Theory couldn’t explain?
Which of the following statement is false? (I) Matter consists of indivisible atoms. (II) All the atoms of a given element have identical properties including identical mass. (III) Compounds are formed when atoms of …
…A… are formed when atoms of different elements combine in a …B… ratio. Here, A and B refer to
Assertion :Density is expressed as g mL–1 whereas specific gravity is dimension less. Reason :Specific gravity is ratio of the masses of solution and solvent.
Which of the following has the largest volume ?
How many significant figures does 63180 have?
_________is referred to as the closeness of different measurements for the same quantity.
How many significant figures are present in 0.10100 × 103?
2H3PO4 + 3 Ca(OH)2Ca3(PO4)2 + 6 H2O Equivalent weight of H3PO4 in this reaction is
The normality of 0.3 M phosphorous acid (H3PO3) is