Advertisements
Advertisements
प्रश्न
Name a soft metal.
Advertisements
उत्तर
Gold
APPEARS IN
संबंधित प्रश्न
Tick the most appropriate answer.
How many times is a proton heavier than an electron?
- 1500
- 1800
- 1840
- none of these
Correct the following statement:
CO and Co both represents cobalt.
Tick (√) the correct alternative from the choice given for the following statement
The hardest naturally occurring substance
The important physical properties of substances are colour, odour, nature, density & solubility in water.
Name – two coloured gases (with their colours)
Select the correct answer to the statement given below:
A metalloid
Give a reason for the following statement:
Components in a mixture are present in varying proportions and not in a fixed proportion.
State why brass is considered as a homogenous mixture while a mixture of iron & sulphur – heterogenous.
The diagram represents fractional distillation for the separation of mixtures. Answer the following :
- Can two immiscible liquids be separated by this process?
- Separation of liquids by this process is based on which physical property?
- If methyl alcohol & water are to be separated, which liquid would remain in flask ‘X’ after condensation.
- Give a reason for the above answer.
- State the purpose of the fractionating column in the apparatus.
Match the following.
| Atom | Building block of matter |
| Element | Atoms of different kinds |
| Compound | Atoms of the same kind |
| Molecule | Smallest unit of a substance |
Non-metals are usually poor conductors of heat and electricity. They are non-lustrous, non-sonorous, non-malleable and are coloured.
Name a non-metal which is required for combustion.
