Question

Solve this:

Q19. Which has minimum number of atoms of oxygen?

(a) 10 mL H2O(l) (b) 0.1 mole of V2O3(s)

(c) 12 gm O3(g) (d) 12.044 × 1022 molecules of CO2
Q20. Rearrange the following (I to IV) in the order of increasing masses :

(I) 0.5 mole of O3 (II) 0.5 gm atom of oxygen

(III) 3.011 × 1023 molecules of O2 (IV) 5.6 litre of CO2 at STP


(a) II < IV < III < I (b) II < I < IV < III (c) IV < II < III < I (d) I < II < III < IV

Q21. The volume of a drop of water is 0.0018 ml then the number of water molecules present in two drop of water at room temperature is :

(a) 12.046 × 1019 (b) 1.084 × 1015 (c) 4.84 × 1017 (d) 6.023 × 1023

Q22. It is known that atom contain protons, neutrons and electrons. If the mass of neutron is assumed to half of its original value whereas that of proton is assumed to be twice of its original value then the atomic mass of C146 will be :

(a) same (b) 14.28% less (c) 14.28% more (d) 28.56% less

Answer 1

aaasbjjnnbvavnNnznxnbxnNbznzn