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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
What happens when Dilute sulphuric acid is poured on a copper plate?
Write word equations of the reactions involved.
Write the name and formula of a metal hydride.
State one use of the following metal:
Gold
The atomic number of an element Y is 16.
- What must an atom of Y do to achieve the nearest inert gas electron arrangement?
- Which inert gas is nearest to Y?
Give the composition of an alloy called solder. State its one property and one use.
What is an alloy?
Mention two uses of the following metals and non-metals
Aluminium
Give reasons
Magnesium is used in fire works.
A metal with melting point less than 50°C is
Give the general characteristics of:
Alkaline earth metals with reference to
(i) bonding
(ii) action of air
(iii) action of water
(iv) action of acid
Write name.
The nonmetal having electrical conductivity.
What is it made from? Why?
A pair of tongs.
With reference to the following metals state their use in daily life metal:
copper
With reference to the following metals state their use in daily life metal:
Silver
Name the following:
The most reactive halogen.
Write scientific reason.
Meena’s mother uses lemon or tamarind for cleaning copper vessels turned greenish.
The metal which is liquid at room temperature is ______.
Metals are usually solids or gases at room temperature.
All gases are ______.
X [2, 8, 7] and Y [2, 8, 2] are two elements. Using this information, complete the following:
Metal atoms tend to have a maximum of ______ electrons in the outermost shell.
