(i) In scientific approach, it is considered only a trial idea
(ii) In 1785, the French chemist Lavoisier presented the law of:
(iii) It is the heaviest particle in an atom:
(iv) The electronic configuration of Sodium ion (Na+) is similar to this noble gas:
(v) The process in which molecules escape from the surface of the liquid is called:
(vi) It is the longest period of the modern periodic table:
(vii) A solution of known concentration is called:
(viii) It is an endothermic reaction:
(ix) In Lead storage battery this dilute acid is used as an electrolyte:
(x) It is the second most abundant element in the earth’s crust:
(xi) A mixture of carbon-mono-oxide (CO) and Hydrogen (H2) is called:
(xii) Air contains about 21% of this gas by volume:
(xiii) The nature of normal oxides of non-metals is:
(xiv) The chemical formula of Oleum ( pyrosulphuric acid) is:
(xv) Which one of the following molecule is an Alkane?
(xvi) Impure Iron metal obtained from the blast furnace is called:
(xvii) The color of black shoe polish is due to:
2. Write one contribution of each of the following scientist towards the development in Chemistry.
(i) J. Priestly (ii) J.J. Berzelius (iii) John Dalton
3. Define molar mass and calculate the molar mass of CaC03 and MgCl2. (Atomic masses: Ca=40, C = 12, 0 =
16, Mg = 24, Cl = 35,5)
4. What is a chemical reaction? Define single displacement reaction with a relevant chemical equation.
5. Balance the following chemical equations:
(i) Al + HCI –>AICl3 + H2
(ii) Sb+ Cl2 –> SbCl3
(iii) S + H2SO4 (conc.) –> SO2 + H2O
6. Define: (i) Atomic number (ii) Mass number (iii) Avogadro’s number
7. Write down three differences between ordinary water and heavy water.
8. Define Isotopes and find-out the number of neutrons in the following Isotopes. (i) Pb (ii) U
9. State Brronsted-Lowry theory of acids and bases with one example of each.
10. Write chemical formula of the following Hydrated salts with their water of crystallization.
(i). Copper Sulphate (ii) Sodium Carbonate (iii) Magnesium Sulphate
11. Define: (i) Solubility (ii) Molarity (iii) Molality
12. State following laws:
(i) Modern Periodic law (ii) Henry’s law (iii) Graham’s law of diffusion of gases
13. A solution contains 2 moles of Ethyl Alcohol and 3 moles of Water. Calculate the mole fractions of Ethyl Alcohol and Water in this solution.
14. Write three uses of graphite.
15. What is a change in Enthalpy (t.H)? How does it help to identify the types of thermo-chemical -reactions?
16. Define Oxidation by three different ways with one suitable example for each.
17. Chlorine is naturally found in two stable isotopes 17Cl35 and 17Cl37 in the proportion of 75% and 25% respectively.Calculate its atomic mass.
18. State the law of multiple proportions and explain it with the help of an example.
19. Define neutralization, write down chemical equations of the reaction of NaOH with HCI and CH3COOH.
20. Define the following:
(a) Electrochemical Equivalent (b) Faraday (c) pH
21. What are metalloids? Write two differences between metals and non-metals.
22. Define: (i) Paints (ii) Varnishes (iii) Polishes
23.(a) Describe industrial preparation of Nitric acid (HNO3) by Ostwald’s process with 3 balanced chemical equations.
(b) Define (i) Hydro Carbons (ii) Aliphatic Hydro Carbons (iii) Alicyclic Hydro Carbons (iv) Aromatic Hydro Carbons.
(c) Write down 4 characteristics of Covalent Compounds.
24.(a) Describe Laboratory preparation of Chlorine gas by taking manganese dioxide (MnO2) & Hydrochloric acid
(HCI). Also, draw a labeled diagram.
(b) Name the group of the periodic table which contains highly. electronegative elements. Also, write three
common characteristics of this group.
(c) Define: (i) Chemical bond (ii) Ionic bond (iii) Covalent bond (iv) Co-ordinate covalent bond.
25.(a) Describe electrolytic refining of Blister Copper with a labeled diagram.
(b) Describe the following methods to remove hardness in water. (i) Clark’s method (ii) By using Zeolite Permutit.
(c) Define Oxides classifies Oxides on the basis of the oxidation state of oxygen into three groups with one example of each.