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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
Mark ‘T’ if the statement is true and ‘F’ if it is false.
Copper displaces zinc from zinc sulphate solution. ( )
Write the name and formula of a metal hydride.
Name one ore of manganese. Which compound of manganese is present in this ore? Also write its chemical formula.
For the reduction of a metal oxide, suggest a reducing agent other than carbon.
Give reasons
Magnesium is used in fire works.
Aluminium is not used to make :
Write ‘True’ or ‘False’ in front of following statement.
Brass is an alloy of copper and zinc and has lustrous yellow colour.
State the position of the following in the periodic table:
Alkali metals
State the position of the following in the periodic table:
Aluminium
Why are alkali metals kept in kerosene oil?
Write name.
The nonmetal having electrical conductivity.
Match the columns.
| Group A | Group B |
| 1) Copper and Zinc | a) Brass |
| 2) Copper and Tin | b) Bronze |
| c) Stainless steel |
An element which is always lustrous, malleable and ductile is ______.
Can you store pickle in an aluminium utensil? Give reason.
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.
Which of the following is not a metal?
Metals are ______ conductors of heat and electricity.
Why are metalloids called semimetals?
The metals which are found in both free state as well as combined state are ______.
X [2, 8, 7] and Y [2, 8, 2] are two elements. Using this information, complete the following:
______ is the reducing agent.
