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प्रश्न
Name a non-metal that is hardest naturally occurring substance
उत्तर
Diamond (Carbon)
APPEARS IN
संबंधित प्रश्न
Name two metals which are both malleable and ductile.
State five uses of non-metals.
State one use of Hydrogen.
You are given a dry cell, a torch bulb with holder, wires and crocodile clips. How would you use them to distinguish between samples of metals and non-metals?
Which of the following metal exists in the liquid state?
(a) Na
(b) Ag
(c) Cr
(d) Hg
Name a metal that is most malleable
Name the metals present in the following alloys
Stainless steel
Tick (√) the most appropriate answer.
Sodium amalgam is prepared by dissolving sodium in :
State the composition of given alloy:
Bronze
`M+ HCl → MCl_2 +—`
Select from the following ist:
`Fe_2O_3, , NO, PbO, Mn_2O_7`
Amphoteric oxide …………
Name:
the compound responsible for green deposit on the surface of copper
Identify the odd term.
Give the common name and chemical name of an ore of:
(a) zinc (b) aluminium (c) iron.
With reference to the physical properties of metals and non-metals, state the following exception.
A non-metal which conducts electricity.
Give reason for the following:
Metals form cations while non-metals form anions.
State whether the statement given below is true or false. If false write the correct statement.
Lead pencils contain lead.
Find the odd one out and give its explanation.
Match the columns.
| Group A | Group B |
| 1. Making sheets of metals | a) Sonority |
| 2. Making metal utensils | b) Malleability |
| 3. Making Copper wires | c) Good conductor of heat |
| 4. Making bells from metal | d) Ductility |
Boojho has learnt that non-metals on beating with a hammer are generally broken into pieces. Which of the following is non-metal?
