| 1 |
Which of the following is a chemical change? |
Evaporation of water
Burning of candle
Glowing of an electric bulb
Liquefaction of air
|
| 2 |
Which of the following is a fertilizer? |
Sodium nitrate
Sodium carbonate
Sodium peroxide
Sodium thiosulphate
|
| 3 |
Which of he following is a non-ferrous metal? |
Cobalt
Aluminium
Nickel
iron
|
| 4 |
Which of the following is not a chemical action? |
Buring of coal
conversation of water into steam
Digestion of food
Burinig of paper
|
| 5 |
Which of the following is not a compound of calcium? |
Gypsum
marble
Chalk
cilicon
|
| 6 |
Why is phosphorus kept under water? |
to make it durable
To make it wet
to save it form catching fire when exposed dot dry air
water forms a protective coating on it
|
| 7 |
Which among the following element (metals) pollutes the air of a city having large number of automobiles? |
Cadmium
Chromium
Lead
Nickel
|
| 8 |
Which of the following is also called Stranger Gas? |
Xenon
Argon
Neon
Nitrous oxide
|
| 9 |
Chemical name of bleaching powder is: |
Calcium Chlorate
Calcium Chloro hypochlorite
Calcium hypochlorite
Calcium bi chloride
|
| 10 |
Which mineral is the core of aluminium? |
Bauxite
Haematite
Siderite
Mangeltite
|
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