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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
Name one ore of manganese. Which compound of manganese is present in this ore? Also write its chemical formula.
Mention two uses of the following metals and non-metals
Oxygen
Mention two uses of the following metals and non-metals
Iodine
Write ‘true’ or ‘false’ for the following statement.
Iodine acts as an antiseptic in the form of a tincture of iodine.
Aluminium is not used to make :
State two important uses of following metal.
Uses of copper
State two important uses of following metal
Uses of magnesium
Give the general characteristics of:
Alkali metals,
(i) bonding
(ii) action of air
(iii) action of water
(iv) action of acid
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.
Which is the non-ionic compound in the compounds given below.
AgNO3 + Nacl → AgCl + NaNO3
What was Mendeleev's basis for the classification of elements?
State the position of the following in the periodic table:
Halogens
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.
An element which is always lustrous, malleable and ductile is ______.
Why are bells made of metals?
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.
The most abundant element in the universe is ____________.
Sodium is a hard metal.
Which metals are liquid at room temperature?
Compare the conductivity of metals and non–metals.
