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प्रश्न
Mention two uses of the following metals and non-metals
Gold
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उत्तर
It is used for making ornaments and coins.
It is used in the manufacture of electronic devices like computers, telephones, home appliances, etc.
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संबंधित प्रश्न
Fill in the blanks:
Metals react with acids to produce _________ gas.
State one use of the following metal:
Copper
Name an alloy of lead and tin.
Brass is an alloy of copper and ______.
Name one ore of manganese. Which compound of manganese is present in this ore? Also write its chemical formula.
What is meant by 22 carat gold?
Give reasons
Magnesium is used in fire works.
Give reasons
Graphite is used in the leads of pencils
A metal with melting point less than 50°C is
State two important uses of following metal
Uses of mercury
Give the general characteristics of:
Alkali metals,
(i) bonding
(ii) action of air
(iii) action of water
(iv) action of acid
Write name.
The device used for grinding an ore.
Write scientific reason.
Generally the ionic compounds have high melting points.
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.
With reference to the following metal state its use in daily life:
Magnesium
Name the following:
A halogen which is a solid at room temperature.
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.
A white crystalline solid which decrepitates on heating leaving a residue which fuses with the glass and evolves two gases one of which is coloured and acidic.
Aluminium: _______: gold : : electric insulator
Complete the following flow chart.
Name two soft metals which can be cut with a knife.
