BUDS PUBLIC SCHOOL, DUBAI
Revision Worksheet
Class: 11
Subject : Chemistry
1. 1L of a gas at STP weighs 2.4 g. Calculate molecular mass.
2. Arrange the following elements in order of increasing atomic size.
(i) B, C, N, O
(ii) N3-, O2-, F- , Mg2+
3. State law of definite proportion.
4. Write the IUPAC name and symbol of an element with atomic number 117.
5. Identify electronic configuration of an element in 3rd period and 15th group.
6. Draw Lewis dot structure of H2O molecule.
7. Calculate the number of moles in the following masses.
(i) 112mg of Fe (atomic mass.56g)
(ii) 20g of Ca (atomic mass.40g)
8. Explain (i) Ionization enthalpy of Nitrogen is higher than Oxygen
(ii) Cesium is the most reactive element.
9. Distinguish electro negativity and electron gain enthalpy.
10. Find the number of molecules in 10.6 g of Na2CO3. (Atomic mass of Na=23, C=12, O=16).
11. (a)State Newland Law of Octaves.
(b)Give a set of Elements included Dobernier law of Triads.
12. Calculate the weight of lime (CaO) obtained by heating 2000kg of lime stone (CaCO3).
(Atomic mass of C= 12g, O=16g , Ca=40g)
13. Calculate the molarity of NaOH in the solution prepared by dissolving its 1g in enough
water to form 250 ml of the solution(Atomic mass of Na=23g, H=1g, O=16g).
14. Calculate the frequency and energy of a photon of radiation having wavelength 3000 A0
15. An organic compound on analysis gave the following percentage composition:
Carbon-24.27%, Hydrogen-4.07% and rest are Chlorine. Molecular Mass is 98.96g.
Calculate the empirical and molecular formula.
16. Elements A, B and C have atomic numbers Z-1, Z and Z+1 respectively. Element B is
Inert gas.
(i)Predict group number of A and C.
(ii)Select the element with highest ionization energy .Give reason.
(iii)Select the most reactive metal. Give reason.
17. (a)List out two main features of Modern Periodic table.
(b)Arrange B, Li, Be, F, O, N, C, Ne in order of ionization energy.
(c)Identify an element with highest negative electron gain enthalpy.
18. Find the percentage composition of each element in Na2SO4. (Atomic mass of Na-23,
S-32, O-16)
19. Three elements A, B and C have valance electrons 1, 4 and 7 respectively.
(a)Predict appropriate group of each element.
(b)Identify charges on ions formed by each element.
(c)Write the formula and Lewis structure of covalent compounds formed between
(i)A and B (ii) A and C (iii) B and C
20. Calculate number of atoms in(a)5 l of O2 gas at STP (b)4.4 g of CO2
(c)3.01 x1023 molecules of N2. (d)2 moles of CO2
(e) 0.6 g of Carbon atom