| 1 |
Anode rays sand proton were discovered by which chemist?
|
E.Rutherford <br>
E.Goldstein <br>
J Chandwick <br>
J J Thomson<br>
|
| 2 |
When steam passed through white hot coke a reaction occurs and the temperature of he coke falls,
|
What does the indicate <br>
The reaction is endothermic <br>
coke contain impurities<br>
The reaction is exothermic <br>
|
| 3 |
which of the following metals has an oxide that cannot be reduced by heating with magnesium?
|
Silver <br>
copper<br>
calcium <br>
iron<br>
|
| 4 |
Which of the following reacts with water to form a soluble compound and compo9ind and an insoluble gas?
|
potassium<br>
copper <br>
ammonia <br>
sulfur dioxide<br>
|
| 5 |
Which one of the following changes occurs when a photographic film is exposed to light
|
the liberation of metallic silver by electrolysis <br>
the precipitation of a light sensitive silver salt <br>
the reduction of a silver salt to metallic<br>
the oxidation of a silver salt to metallic silver <br>
|
| 6 |
Which is he rarest naturally-occurring element on earth
|
Gold <br>
antimony <br>
germanium <br>
astatine <br>
|
| 7 |
Which of element shows maximum radioactivity?
|
Francium <br>
Uranium<br>
Radium<br>
Thorium<br>
|
| 8 |
Which of the following is used in making bullet-proof jackets?
|
Francium carbide<br>
Iron carbide <br>
Silicon carbide <br>
Boron carbide <br>
|
| 9 |
Which metal has the lowest vapor pressure and the highest melting point
|
Francium <br>
Caesium<br>
Tungsten<br>
Lithium<br>
|
| 10 |
Which of allotrope of phosphorus is the most stable?
|
Black <br>
Withe <br>
Red <br>
Yellow <br>
|
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