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प्रश्न
Name the following:
The most reactive halogen.
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उत्तर
Fluorine
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संबंधित प्रश्न
Give reasons for the following.
Copper cannot displace zinc from its salt solution.
What happens when Iron nails are placed in copper sulphate solution?
Write word equations of the reactions involved.
State one use of the following metal:
Silver
What is an alloy?
What is an alloy?
How are the properties of an alloy different from those of the constituent elements?
Mention two uses of the following metals and non-metals
Gold
Mention two uses of the following metals and non-metals
Oxygen
Give reasons
Gold is mixed with copper and nickel.
Write ‘true’ or ‘false’ for the following statement :
Silver is used to make electric cables.
Tick (√) the most appropriate answer.
Graphite is used :
State two important uses of following metal:
Uses of zinc
Write name.
The device used for grinding an ore.
Match the alloys given in column I to the uses given in column II :
| Column I | Column II |
| (i) Duralumin | A. Electrical fuse |
| (ii) Solder | B. Surgical instruments |
| (iii) Brass | C. Aircraft body |
| (iv) Stainless Steel | D. Decorative articles |
Name the following:
The chemical compound responsible for the green deposit on the surface of articles of copper.
Which one of the following is an example for a metal?
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 metals are liquid at room temperature?
Compare the conductivity of metals and non–metals.
The metals which are found in both free state as well as combined state are ______.
