Question : Mercury is a:

Option 1: solid metal

Option 2: liquid metal

Option 3: Solid non-metal

Option 4: liquid non-metal

Question : Which one of the following non-metals shows allotropy in the liquid state?

Option 1: Carbon

Option 2: Sulphur

Option 3: Phosphorus

Option 4: Bromine

Question : On a clean glass plate, a drop of water spreads to form a thin layer, whereas a drop of mercury remains almost spherical because:

Option 1: mercury is a metal

Option 2: the density of mercury is greater than that of water

Option 3: the cohesion of mercury is greater than its adhesion with glass

Option 4: the cohesion of water is greater than its adhesion with glass

Question : 20 litres of a mixture contains 20% alcohol and the rest is water. If 4 litres of water is mixed in it, the percentage of alcohol in the new mixture will be:

Option 1: $33\frac{1}{3}\%$

Option 2: $16\frac{2}{3}\%$

Option 3: $25\%$

Option 4: $12\frac{1}{2}\%$

Question : Ethanol containing 5% water is known as :

Option 1: Dilute alcohol 

Option 2: Power alcohol

Option 3: Rectified spirit

Option 4: Absolute alcohol