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प्रश्न
State one use of Gold.
उत्तर
Gold is used to make jewellery.
APPEARS IN
संबंधित प्रश्न
Fill in the following blanks with suitable words:
A metal having low melting point is ..................... but a non-metal having very high melting point is ..............
Mention two uses of the following metals and non-metals
Oxygen
Write scientific reason.
Sodium is always kept in kerosene.
When a copper coin is dipped in silver nitrate solution, a glitter appears on the coin after some time. Why does this happen? Write the chemical equation.
Higher Order Thinking Skills.
Aakash noticed that the metal latch on gate was difficult to open during hot sunny days. However, it was not difficult to open the same latch at night. Aakash observed that the latch and the gate are exposed to the sun during day time.
- Formulate a hypothesis based on the information provided.
- Briefly state how you would test the hypothesis.
A is a reddish-brown metal, which combines with O2 at < 1370 K gives B, a black coloured compound. At a temperature > 1370 K, A gives C which is red in colour. Find A, B, and C with reaction.
Which of the following two combinations are correct?
| Metal | Gas Evolved | |
| (i) | Copper | Yes |
| (ii) | Iron | Yes |
| (iii) | Magnesium | No |
| (iv) | Zinc | Yes |
Name two major non-metals which are present in fertilisers and enhance the growth of plants.
The liquid metal at room temperature ______.
Compare the conductivity of metals and non–metals.
