| 1 |
The term 'Carat' is used to express the purity of gold. The purest form of gold is.The purest form of gold is?
|
18 carats <br>
20 carets <br>
22 carats<br>
24 carats<br>
|
| 2 |
The tow element s that exist as liquids at 25°C are?
|
Mercury and lithium<br>
mercury and caesium<br>
Bromine and mercury <br>
Mercury and argon<br>
|
| 3 |
What is the commonly called limestone is
|
CaO
CaC<sub>2</sub>
CaSO<sub>4</sub>
CaCO<sub>3</sub>
|
| 4 |
What is the chemical name of bleaching powder?
|
Calcium carbonate<br>
Calcium hydrochloride<br>
Calcium Phosphate<br>
Calcium cynamide<br>
|
| 5 |
Which of the following element behave chemically both as a metal and a non metal?
|
Argon<br>
Carbon<br>
Xenon<br>
Boron<br>
|
| 6 |
Which of the following element is found in all organic compounds?
|
Calcium<br>
Carbon<br>
Nitrogen<br>
Oxygen<br>
|
| 7 |
Which of the following gases is he most toxic?
|
Carbon dioxide<br>
Carbon monoxide<br>
Sulphur dioxide<br>
Acetic acid<br>
|
| 8 |
Which of he following gases is used in he cigarette lighters?
|
Butane<br>
methane<br>
Propane<br>
radon<br>
|
| 9 |
Which of the following has o pH less than7? |
Blood
Tears
Pure water
saliva
|
| 10 |
Which of the following is has the same atomic number and atomic weight? |
Hydrogen
Helium
Oxygen
nitrogen
|
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