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प्रश्न
Give reasons
Magnesium is used in fire works.
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उत्तर
Magnesium is used in fire works because it bums with a dazzling light.
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संबंधित प्रश्न
Write the name and formula of a metal hydride.
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?
Name an alloy of lead and tin.
Name two alloys of iron. What elements are present in these alloys?
Give reasons
Gold is mixed with copper and nickel.
Write ‘true’ or ‘false’ for the following statement :
Silver is used to make electric cables.
Write ‘true’ or ‘false’ for the following statement.
Iodine acts as an antiseptic in the form of a tincture of iodine.
Statements given below are incorrect. Write the correct statements :
Bronze is a mixture of 10% copper, 80% zinc and 10% tin.
State two important uses of following metals:
Uses of iron
Why are alkali metals kept in kerosene oil?
What is it made from? Why?
A pair of tongs.
Name the following:
A metal used in packaging.
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.
An amorphous substance which turns from pale green to black on strong heating evolving a colourless, acidic gas as the only gaseous product.
Halogen reacts with acid.
Name one metal and one non-metal that exist in liquid state at room temperature. Also name two metals having melting point less than 310 K (37°C)
An element forms an oxide A2O3 which is acidic in nature. Identify A as a metal or non-metal.
Metals are usually solids or gases at room temperature.
The metal can be cut with a knife ______.
Why do metals appear shiny?
Compare the conductivity of metals and non–metals.
