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WorksheetsAtom and Molecules 1
Total questions: 10
Worksheet time: 5mins
1. The atomic symbol of silver is —————
(a) Si
(b) S
(c) Au
(d) Ag
2. A box contains some identical red colour balls labelled as A each weighing 2 g. Another box contains identical blue colored balls, labelled as B, each weighing 5 g. In the combinations AB, AB2, A2B and A2B3 which is applicable?
(a) Law of Definite proportion
(b) Law of multiple proportion
(c) Law of conservation of mass
(d) None of the above
3. What is the value of Avogadro’s number?
(a) 6.02 x 10-23
(b) 6.02 x 1023
(c) 6.02 x 10-22
(d) 6.02 x 1022
4. What is the chemical formula of sodium carbonate?
(a) Na2CO3
(b) NaHCO3
(c) NaCO3
(d) Na2HCO3
5. Which of the following is the correct pair of atom and its atomic symbol?
(a) Sulphur – Su
(b) Potassium – P
(c) Phosphorus -P
(d) Sodium- S
6. How many moles are present in 40 g of He?
(a) 5 moles
(b) 20 moles
(c) 6 moles
(d) 10 moles
7. Atomic mass of Chlorine is ————– (u)
(a) 34
(b) 34.5
(c) 35
(d) 35.5
8. 46 gm of sodium is equal to ————-
(a) 7 moles
(b) 1.5 moles
(c) 2 moles
(d) 1 mole
9. The formula of Ammonium Sulphate is —————–
(a) NH4SO4
(b) NH4SO2
(c) (NH4)2SO4
(d) NH2SO4
10. The atomic symbol of Iron is —————.
(a) I
(b) Fe
(c) Ir
(d) Au
