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प्रश्न
Name a metal which is best conductor of electricity :
उत्तर
Silver
APPEARS IN
संबंधित प्रश्न
State one use of Iron.
What is an amalgam?
Which property of 'solder' alloy makes it suitable for welding electrical wires?
Aluminium is not used to make :
Take an element from an alkali metal and one from an alkaline earth metal and write an equation for their action with:
Hydrochloric acid,
Write scientific reason.
Generally the ionic compounds have high melting points.
Write scientific reason.
Pine oil is used in froth flotation.
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.
What is it made from? Why?
A pair of tongs.
With reference to the following metals state their use in daily life metal:
Magnesium
Name the following:
The most reactive halogen.
Write scientific reason.
Meena’s mother uses lemon or tamarind for cleaning copper vessels turned greenish.
An element which is always lustrous, malleable and ductile is ______.
Which one of the following metals do not react with cold as well as hot water?
Which of the following metals are obtained by electrolysis of their chlorides in molten state?
- Na
- Ca
- Fe
- Cu
An element forms an oxide A2O3 which is acidic in nature. Identify A as a metal or non-metal.
A doctor prescribed a tablet to a patient suffering from iron deficiency. The tablet does not look like iron. Explain.
Sodium is a hard metal.
Match the following
| i. | Softest metal | a. | Copper |
| ii. | Hardest metal | b. | Sodium |
| iii. | Hardest non–metal | c. | Osmium |
| iv. | Ductility | d. | Diamond |
