1. The most reactive among the halogens is:
(1) Bromine (2) Chlorine
(3) Iodine (4) Fluorine
2. The electronic configuration of an atom having atomic number '20' is
(1) 2, 8, 10 (2) 2, 8, 8, 2
(3) 2, 6, 8, 4 (4) 2, 10, 8
3. When water itself combines chemically with some element or mineral it is called:
(1) Carbonation (2) Oxidation
(3) Desalination (4)Hydration
4. Rainwater collected after 30 to 40 minutes of raining is not suitable for drinking because it
(1) contains dissolved toxic chemicals
(2) contains bacteria and dirt
(3) is deficient in minerals
(4) is acidic
5. What is commonly called limestone is:
(1) CaO (2)CaC2
(3) CaSO4 (4) CaCO3
6. The two elements that exist as liquids at 25°C are
(1) mercury and lithium (2)mercury and Cesium
(3) bromine and mercury (4)mercury and argon
7. Which of the following is used as laughing gas?
(1) Nitrogen dioxide (2) Nitrogen dioxide
(3) Nitrous oxide (4) Nitrogen tetra oxide
8. Which of the following is a chemical change?
(1) Evaporation of water (2) burning of candle
(3) Glowing of an electric bulb (4)liquefaction of air
9. The most inexpensive and commonly used variety of glass is called soda glass. it is called so because it:
(1) was used initially for making bottles for soda(Carbonated drink)
(2) is made using soda(Sodium carbonate)
(3) was initially used for storing sodium carbonate
(4) is made using soda lime
10. When items of jewellery made of metals such as copper or nickel are placed in a solution having a salt of gold, a thin film of gold is deposited by
(1) passing an electric current
(2) cooling to below 0 degree Celsius
(3) heating above 100 degree Celsius
(4) just keeping it for 10 minutes
Answers:
1. (4) 2. (2) 3.(4) 4. (1) 5.(4)
6. (3) 7. (3) 8.(2) 9. (2) 10. (1)
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