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प्रश्न
Tick (√) the most appropriate answer.
Graphite is used :
विकल्प
for sterilisation of water
for making stainless steel
as dry lubricant
in making electric bulbs
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उत्तर
as dry lubricant
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संबंधित प्रश्न
Mark ‘T’ if the statement is true and ‘F’ if it is false.
Generally, non-metals react with acids. ( )
State one use of the following metal:
Mercury
What is an amalgam?
The alloy in which one of the metals is mercury is called an ______.
What is an alloy?
How does the electrical conductivity of copper alloys, brass and bronze, differ from that of pure copper?
Mention two uses of the following metals and non-metals
Gold
Write ‘true’ or ‘false’ for the following statement :
Silver is used to make electric cables.
Fill in the blank spaces by choosing the correct words from the given list.
List: amalgam, chlorine, gallium, sodium chloride, silver chloride
A solution of a metal in mercury is called ________
Name a metal which is best conductor of electricity :
State two important uses of following metal:
Uses of zinc
State the position of the following in the periodic table:
Alkaline earth metals
Write name.
The nonmetal having electrical conductivity.
Which is the non-ionic compound in the compounds given below.
AgNO3 + Nacl → AgCl + NaNO3
What is it made from? Why?
A pair of tongs.
Soft metal : Na : : hard metal : _______
Match the columns.
| Group A | Group B |
| 1) Copper and Zinc | a) Brass |
| 2) Copper and Tin | b) Bronze |
| c) Stainless steel |
Name one metal and one non-metal that exist in liquid state at room temperature. Also name two metals having melting point less than 310 K (37°C)
An element forms an oxide A2O3 which is acidic in nature. Identify A as a metal or non-metal.
Metals have high melting points.
