(i) It is a trial idea:
(ii) It is the empirical formula of glucose:
(iii) It is not an isotope of oxygen:
(iv) The vertical columns of the periodic table are called:
(v) It is an ionic compound:
(vi) Neither definite shape nor definite volume 1s the property of:
(vii) It is defined as the number of moles of a solution dissolved in one liter of solution:
(viii) It is the unit of electrical current:
(ix) It is a proton-donor:
(x) It is an exothermic process:
(xi) It is an Ion-exchanger resin:
(xii) When carbon burns in air, this gas is produced:
(xiii) It is the study of Hydrocarbons and their derivatives:
(xiv) This gas is used for respiration:
(xv) It is the only liquid metal:
(xvi) The most abundant and useful halogen is:
(xvii) Red ink is normally prepared from:
2. Write one contribution of each of the following scientists towards the development of Chemistry.
3. Balance the following chemical equations:
4. Define Double Displacement Reactions and give one example.
5. Calculate the number of neutrons in the following isotopes:
6. Calculate the number of moles in 7.4g Ca(OH)2. (Atomic Masses: Ca =40, O=16, H=1)
7. Write three differences between Covalent Bond and Coordinate Bond.
8. Define the following:
(i) Diffusion (ii) Sublimation (iii) Brownian movement
9. A solution has been prepared by dissolving 2 moles of ethyl alcohol in 8 moles of water. Calculate the mole fractions of ethyl alcohol and water in this solution.
10. Write the chemical formulae of the following compounds:
(i) Bauxite (ii) Haematite (iii) Copper Pyrite
11. Which elements have zero valency? In which group of the Periodic Table have they been placed? Also, give their two examples.
12. How many Periods and Groups are there in the Modern Periodic Table? Also, state what are Lanthanides and Actinides?
13. State the Law of Reciprocal Proportions and explain it with the help an example.
14.What is Silica Gel? Write its two uses.
15. Define Acid-Base & salt · also give one example of each.
16. Write three uses of Chlorine.
17. Write three differences between Oxidation and Reduction Reactions.
18. What is Soap How it removes dirt & dust from cloth?
19. A hydrocarbon contains six carbon atoms. writes ts molecular formula if it is:
(i) An Alkane (b)An alkene (c) An Alkyne
20. Calculate the pOH of a 0.1 M Nitric solution.
21. Write three properties os cathode Rays.
22. Dofine tho following:
(I) Thermochemistry (II) Heat of Neutralization (iii) Enthalpy
23.(a) How is caustic Somanufacturedrod by Castner-Kellner’s Cell? Explain the process giving balanced chemical equations (Diagram is not required)
(b) With the help of a labeled diagram, explain the construction and working of a Lead Storage Battery.
(c) With the help of a labeled diagram and balanced chemical equations, explain how Nitric Acid is manufactured by Ostwald’s Process.
24.(a) Explain giving balanced chemical equations, the Contact Process for the manufacture of Sulphuric Acid. (Diagram is not required.)
(b) What is the difference between Soft Water and Hard Water? How is hard water softened by Clark’s Method?Explain
(c) Write two causes of food-spoilage and two methods of its prevention.
25.(a) Define the following:
(i) Homologous Series (ii) Functional Group (iii) Aliphatic Hydrocarbons
(iv) Alicyclic Hydrocarbons (v) Aromatic Hydrocarbons
(b) Describe the process of Electrolytic Refining of Blister Copper. Also, draw a labeled diagram.
(c) What is Ionic Bond? How is an Ionic bond formed between Sodium and Chlorine atoms resulting in the production of NaCl? Explain