Question Text
Question 1 :
One mole is equal to number of atoms as contained in:
Question 2 :
The chemical formula of the compound containing carbon and oxygen is :
Question 6 :
The molecular mass of $(NH_2)_2CO$ is :(Given atomic mass of H = 1, O = 16, C = 12, N = 14.)<br/>
Question 7 :
If u are given Avogadro number (N) of atoms of a gas X if half of atoms are converted into X(g) + by energy $\Delta$H. the IE of X is?
Question 11 :
Which postulate of Dalton's atomic theory is the result of the law of conservation of mass?
Question 12 :
A sample of phosphorous trichloride $(PCl_{ 3 })$ contains $1.4$ moles of the substance. How many atoms are there in the sample ?<br/>
Question 14 :
The charge of an electron is $1.6 \times 10^{-19}$ coulombs. What will be the value of charge on ${Na}^+$ ion?
Question 15 :
1..25 g of a solid dibasic acid is completely neutralised by 25 mL of 0.25 molar $Ba(OH)_2$ solution. Molecular mass of the acid is:
Question 16 :
Weight of $14C$ to have radioactivity $1$ curie is: (Disintegration constant $=4.4\times { 10 }^{ -12 }{ sec }^{ -1 }$)
Question 17 :
The mass of residue left after strongly heating 1.38 g of silver carbonate will be:
Question 18 :
An alloy has $Fe$, $Co$ and $Mo$ equal to 71%, 12% and 17% respectively. How many cobalt atoms are there in a cylinder of radius 2.50 cm and a length of 10.0 cm?<br/>[The density of alloy is $8.20\ g/mL$. The atomic weight of cobalt = $58.9$.]<br/>
