Question Text
Question 1 :
Two elements $A$ and $B$ contain $13$ and $8$ protons respectively. If the number of neutrons in them happen to be $14$ and $8$ respectively; the formula unit mass for the compound between $A$ and $B$ unit would be:
Question 2 :
The chemical formula of the compound containing carbon and oxygen is :
Question 3 :
An element $X$ combines with oxygen to form an oxide ${X}_{2}O$. This oxide is electrically conducting. How many electrons would be there in the outermost shell of the element $X$?
Question 4 :
The number of molecules present in $4.4$ g of $CO_{2}$ gas is:<br/>
Question 6 :
The relative formula mass, $M_{r}$, of calcium carbonate, $CaCO_{3}$, is $100$. What is the mass of carbon present in $100\ g$ of calcium carbonate?
Question 7 :
2 moles of chlorine atoms are present in_____g of chlorine gas.
Question 9 :
Assertion: 1 g atom of $O_2$ and 1 g atom of $O_3$ have equal number of molecules.
Reason: Mass of 1 mol atom is equal to its gram atomic mass.
Question 11 :
Which of the following sample contains the maximum number of atoms?
Question 12 :
The molecular mass of $(NH_2)_2CO$ is :(Given atomic mass of H = 1, O = 16, C = 12, N = 14.)<br/>
Question 13 :
Assertion: 23 g of sodium has $6.022 \times 10^{23}$ atoms sodium.
Reason: Number of atoms in the given mass of sodium cannot be determined
