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प्रश्न
Write ‘true’ or ‘false’ for the following statement :
Silver is used to make electric cables.
विकल्प
True
False
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उत्तर
False
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संबंधित प्रश्न
Saloni took a piece of burning charcoal and collected the gas evolved in a test tube.
(a) How will she find the nature of the gas?
(b) Write down word equations of all the reactions taking place in this process.
Which property of graphite is utilised in making electrodes?
How are the properties of an alloy different from those of the constitutent elements?
Give reasons
Gold is mixed with copper and nickel.
Fill in the blank
_______ is a soft metal.
A metal which is neither ductile nor malleable is
State the position of the following in the periodic table:
Alkali metals
The electronic configuration of metal ‘A’ is 2,8,1 and that of metal ‘B’ is 2,8,2. Which of the two metals is more reactive? Write their reaction with dilute hydrochloric acid.
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 |
With reference to the following metals state their use in daily life metal:
Silver
Name the following:
A metal used in flexible pipes.
Aluminium: _______: gold : : electric insulator
Write the name.
Two highly reactive metals-
Electronic configuration of metal A is 2,8,1. Electronic configuration of metal B is 2,8,8,2. Which of the above metals is more reactive? Explain with reason.
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 property is generally not shown by metals?
In the following figure, you find that the bulb glows when an iron nail is placed between two ends of wire. Complete the following sentences on the basis of this fact.
- ______ is a metal.
- Metals are good ______ of electricity.
Why do metals appear shiny?
Why are metalloids called semimetals?
