| 1 |
Which metal has the lowest melting point? |
Li
Na
Rb
K
|
| 2 |
Keeping in view the intermolecular forces of attraction, indicate which compound has the highest boiling point |
H<sub>2</sub>S
HF
NH<sub>3</sub>
H<sub>2</sub>O
|
| 3 |
Which form of carbon is used as a lubricant? |
Coal
Diamond
Charcoal
Graphite
|
| 4 |
Which of the following bond s is expected to b the weakest. |
Cl-Cl<sup>-</sup>
C-C
F-F
O -O
|
| 5 |
Why is H2Oa liquid while H2S is a gas? |
Becuase in waer, the atomic size of oxygen in smaller than that of Sulphur
Because water can easily freeze into ice
Because water is a polar compound ad tere exists strong forces of attrction betwene its molecules
Because H<sub>2</sub>O molecule is lighter than H<sub>2</sub>S
|
| 6 |
Which element is capable of forming all the three types of bonds, covalent coordinate covalent or ionic. |
Carbon
Silicon
Magnesium
Oxygen
|
| 7 |
When molten copper and olten zinc are mixed together , they give rise to a new substnce called brass. Predict what type of bond is formed between copper and zinc. |
Ionic bond
Coordinate Covalent bond
Metallic bond
Covalent Bond
|
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