18
MCQ (Multiple Correct Answer)
Which of the following pairs have the same number of atoms?
A
16 g of $\mathrm{O}_2(\mathrm{~g})$ and 4 g of $\mathrm{H}_2(\mathrm{~g})$
B
16 g of $\mathrm{O}_2$ and 44 g of $\mathrm{CO}_2$
C
28 g of $\mathrm{N}_2$ and 32 g of $\mathrm{O}_2$
D
12 g of $\mathrm{C}(\mathrm{s})$ and 23 g of $\mathrm{Na}(\mathrm{s})$
19
MCQ (Multiple Correct Answer)
Which of the following solutions have the same concentration?
A
20 g of NaOH in 200 mL of solution
B
0.5 mol of KCl in 200 mL of solution
C
40 g of NaOH in 100 mL of solution
D
20 g of KOH in 200 mL of solution
20
MCQ (Multiple Correct Answer)
16 g of oxygen has same number of molecules as in
A
16 g of CO
B
28 g of $\mathrm{N}_2$
C
14 g of $\mathrm{N}_2$
D
1.0 g of $\mathrm{H}_2$
21
MCQ (Multiple Correct Answer)
Which of the following terms are unitless?
A
Molality
B
Molarity
C
Mole fraction
D
Mass per cent
22
MCQ (Multiple Correct Answer)
One of the statements of Dalton's atomic theory is given below "Compounds are formed when atoms of different elements combine in a fixed ratio"
Which of the following laws is not related to this statement?
A
Law of conservation of mass
B
Law of definite proportions
C
Law of multiple proportions
D
Avogadro law