The ionisation energy of hydrogen atom is 13.6eV. What will be the ionisation energy of He+?
13.6 eV
54.4 eV
122.4 eV
Zero
The number of electron and neturons of an element is 18 and 20 respectively. Its mass number is
2
17
37
38
2g of mixture of CO and CO2 on reaction with excess I2O5 produced 2.54g of I2. What would be the mass% of CO2 in the original mixture?
60
30
70
35
When 10g of 90% pure lime stone is heated completely, the volume (in litres) of CO2 is liberated at STP is
22.4
2.24
20.16
2.016
Law of constant composition is same as the law of
conservation of mass
conservation of energy
multiple proportion
definite proportion
D.
definite proportion
The law of constant composition According to this law, "A chemical compound is always found to be made up of the same elements combined together in the same proportions by weights. This law is same as iaw of definite proportions.
BCl3 is a planar molecule, while NCl3 is pyramidal, because
N-Cl bond is more covalent than B-Cl bond
nitrogen atom is smaller than boron atom
B-Cl bond is more polar than NCl bond
BCl3 has no lone pair of electrons but NCl3 has a lone pair of electrons.