19,000+ solved questions for JEE Advanced, JEE Mains, NEET & IChO — with answers and expert explanations.
The number of water molecules present in a drop of water (volume = 0.0018 ml) at room temperature is (density of H2O = 1 g/mL)
The largest number of molecules is in
Rearrange the following I to IV in order of increasing masses and choose the correct answer [At. wt. of N = 14 u, O = 16 u, Cu = 63 u] I 1 molecule of oxygen II 1 atom of nitrogen III 1 × 10–10mol molecule of oxygen…
Which among the following is the heaviest?
If NA is Avogadro’s number then number of valence electrons in 4.2 g of nitride ions (N3–) is
Which of the following weighs the least ?
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
How many H2O molecules are in a 0.10g sample of CuSO4.5H2O (M = 249.7) ?
A gaseous mixture contains oxygen and nitrogen in the ratio of 1 : 4 by weight. Therefore, the ratio of their number of molecules is
How many moles of magnesium phosphate, Mg3 (PO4)2 will contain 0.25 mole of oxygen atoms ?
What’s the number of particles in 10 moles of hydrochloric acid? a) 6.022 × 1024 particles b) 6.022 × 1023 particles c) 6.22 × 1023 particles d) 3.22 × 1022 particles
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 law of conservation of mass holds good for all of the following except:
3 g of a hydrocarbon on combustion in excess of oxygen produces 8.8g of CO2 and 5.4 g of H2O. The data illustrates the law of:
Zinc sulphate contains 22.65% Zn and 43.9% H2O. If the law of constant proportions is true, then the mass of zinc required to give 40g crystals will be :
If water sample are taken from sea, rivers or lake, they will be found to contain hydrogen and oxygen in the approximate ratio of 1:8. This indicates the law of:
A sample of CaCO3 has Ca = 40%, C = 12% and O = 48%. If the law of constant proportions is true, then the mass of Ca in 5 g of CaCO3 from another source will be :
n g of substance X reacts with m g of substance Y to form p g of substance R and q g of substance S. This reaction can be represented as follows : X + Y = R + S The relation which can be established in the amounts of…