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प्रश्न
Name the metals present in the following alloys
Brass
उत्तर
Brass— Copper and zinc
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संबंधित प्रश्न
Classify the following elements into metals, non–metals and metalloids: C, Mg, Si, S, Hg, As.
One day Reeta went to a jeweller’s shop with her mother. Her mother gave an old gold jewellery to the goldsmith to polish. Next day when they brought the jewellery back, they found that there was a slight loss in its weight. Can you suggest a reason for the loss in weight?
Name one metal and one non-metal which exist in liquid state at room temperature.
Give the name and formulae of two basic oxides.
Name two metals which are used for making jewellery and to decorate sweets.
The electronic configurations of four particles A, B, C and D given below:
| A | 2, 8, 8 |
| B | 2, 8, 2 |
| C | 2, 6 |
| D | 2, 8 |
Which electronic configuration represents:
(i) magnesium atom?
(ii) oxygen atom?
(iii) sodium ion
(iv) chloride ion?
Name a metal that is brittle
Name a non-metal that is liquid at room temperature
Give four differences between metals and non-metals with reference to their:
- Melting point and boiling point
- The conductivity of heat and electricity
- Malleability
- Solubility
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Uses of nitrogen
State the composition and two uses of given alloy:
Brass
Select from the following ist:
`Fe_2O_3, , NO, PbO, Mn_2O_7`
Acidic oxide ………………
Give the balanced reactions for the following:
Red hot iron reacts with steam
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Give the common name and chemical name of an ore of:
(a) zinc (b) aluminium (c) iron.
Give reason for the following:
Metals form cations while non-metals form anions.
The composition of aqua-regia is
Generally, non-metals are not lustrous. Which of the following non-metal is lustrous?
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Compounds obtained from non–living sources are called ______.
