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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
Write the name and formula of a metal hydride.
What is an amalgam?
Which property of ‘solder’ alloy makes it suitable for welding electrical wires?
What is a thermite reaction? Explain with the help of an equation.
Statements given below are incorrect. Write the correct statements :
Bronze is a mixture of 10% copper, 80% zinc and 10% tin.
Give the general characteristics of:
Alkali metals,
(i) bonding
(ii) action of air
(iii) action of water
(iv) action of acid
Take an element from an alkali metal and one from an alkaline earth metal and write an equation for their action with:
Sulphuric acid
Why are alkali metals kept in kerosene oil?
Write name.
Molecular formula of the common ore of aluminium.
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.
With reference to the following metal state its use in daily life:
Magnesium
Name the following:
A metal used in packaging.
Which one of the following metals do not react with cold as well as hot water?
Which of the following metals are obtained by electrolysis of their chlorides in molten state?
- Na
- Ca
- Fe
- Cu
Which of the following is not a metal?
Silver and copper are very good conductors of electricity.
Metals have high melting points.
Why do metals appear shiny?
