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प्रश्न
Give reasons
Graphite is used in the leads of pencils
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उत्तर
Graphite turns paper black that is why it is used in the leads of pencils.
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संबंधित प्रश्न
Give reasons for the following.
Copper cannot displace zinc from its salt solution.
Give a reason for Alkali metals are good reducing agents.
Which of the following alloys contains mercury as one of the constituents?
Give reasons
Magnesium is used in fire works.
State two important uses of following metal:
Uses of gold
State two important uses of following metal.
Uses of copper
State two important uses of following metal
Uses of tin
State two important uses of following metal
Uses of lead
State two important uses of following metal
Uses of mercury
Take an element from an alkali metal and one from an alkaline earth metal and write an equation for their action with:
Oxygen
With reference to the following metal state its use in daily life:
Magnesium
With reference to the following metals state their use in daily life metal:
Lead
Name the following:
The chemical compound responsible for the green deposit on the surface of articles of 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.
When a copper coin is dipped in the solution of silver nitrate, it shows a lustre on its surface. Explain this process with the help of a chemical equation.
Complete the following flow chart.
Which of the following is not a metal?
Why are bells made of metals?
Metals and non–metals are used for making ______, ______ and ______.
Why do metals appear shiny?
