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प्रश्न
Give an example of a metal which is a liquid at room temperature.
उत्तर
Mercury
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संबंधित प्रश्न
Choose the correct answer from the options given below:
Anhydrous iron(III) chloride is prepared by:
1) direct combination
2) simple displacement
3) decomposition
4) neutralization
Give the name and formulae of two basic oxides.
Name the non-metal which is used to make electrodes of dry cells.
What is meant by "brittleness"? Which type of elements usually show brittleness: metals or non-metals?
Name two non-metals which are both brittle and non-ductile.
Which of the following are amphoteric oxides:
MgO, ZnO, P2O3, Al2O3, NO2
State one use of Carbon (as Graphite).
The electronic configurations of three elements X, Y and Z are:
| X : 2 | Y : 2, 8, 7 | Z : 2, 8, 2 |
Which of the following is correct regarding these elements?
(a) X is a metal
(b) Y is a metal
(c) Z is a non-metal
(d) Y is a non-metal and Z is a metal
Name a non-metal that is used for filling into electric bulbs
Name the metals present in the following alloys
Brass
Name the metals present in the following alloys
Bronze
Name:
a metal with dull appearance
Name:
a non-metal with high m.p & b.p
Name a non-metal which shows reducing property.
Why do gold ornaments look new even after several years of use?
Distinguish between a mineral and an ore.
Make pairs of substances and their properties
| Substance | Property |
| a. Potassium bromide (KBr) | 1. Combustible |
| b. Gold | 2. Soluble in water |
| c. Sulphur | 3. No chemical reaction |
| d. Neon | 4. High ductility. |
Describe a simple experiment to prove that a copper wire conducts electricity, but a piece of coal does not.
Find the odd one out and give its explanation.
