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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
Which property of graphite is utilised in making electrodes?
The atomic number of an element Y is 16.
(a) What must an atom of Y do to achieve the nearest inert gas electron arrangement?
(b) Which inert gas is nearest to Y?
What is a thermite reaction? Explain with the help of an equation. State one use of this reaction.
A metal which is neither ductile nor malleable is
Fill in the blank spaces by choosing the correct words from the given list.
List: amalgam, chlorine, gallium, sodium chloride, silver chloride
Salt of silver, such as ________ is used for making photographic films.
Write ‘True’ or ‘False’ in front of following statement.
Brass is an alloy of copper and zinc and has lustrous yellow colour.
Write ‘True’ or ‘False’ in front of following statement.
Magnesium is used in making light weight alloys of aluminium.
State two important uses of following metal
Uses of lead
Why are alkali metals kept in kerosene oil?
Write name.
The reagent that dissolves noble metals.
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
Name the following:
The most reactive halogen.
Match the columns.
| Group A | Group B |
| 1) Copper and Zinc | a) Brass |
| 2) Copper and Tin | b) Bronze |
| c) Stainless steel |
Which one of the following is an example for a metal?
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 ability of metals to be drawn into thin wire is known as
Give an example of a metal which
- is liquid at room temperature.
- is the best conductor of heat.
Silver and copper are very good conductors of electricity.
