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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
Give reasons for the following.
Copper cannot displace zinc from its salt solution.
Write the name and formulae of a metal hydride.
Which property of graphite is utilised in making electrodes?
Explain how, a reduction reaction of aluminium can be used for welding cracked machine parts of iron. Write a chemical equation for the reaction involved.
For the reduction of metal oxide, suggest a reducing agent other than carbon.
A metal which is neither ductile nor malleable is
Write ‘True’ or ‘False’ in front of following statement.
Brass is an alloy of copper and zinc and has lustrous yellow colour.
State two important uses of following metals:
Uses of iron
State the position of the following in the periodic table:
Iron and zinc
Take an element from an alkali metal and one from an alkaline earth metal and write an equation for their action with:
Oxygen
Write name.
The oxide that forms salt and water by reacting with both acid and base.
With reference to the following metals state their use in daily life metal:
copper
On heating which of the following substances i.e. copper carbonate, zinc carbonate, washing soda, copper sulphate, zinc nitrate, copper nitrate, lead nitrate, ammonium chloride and ammonium dichromate – relate to the reaction given below.
A white crystalline solid which decrepitates on heating leaving a residue which fuses with the glass and evolves two gases one of which is coloured and acidic.
The minerals from which the metal can be separated economically are called _______.
Complete the following flowchart.
Assertion: Mercury is solid in room temperature.
Reason: Mercury is a non-metal.
What is ductility?
Which of the following metals are obtained by electrolysis of their chlorides in molten state?
- Na
- Ca
- Fe
- Cu
The metal can be cut with a knife ______.
Why are metalloids called semimetals?
