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प्रश्न
Select the appropriate option for the following statement:
The element from the halogen family which is most abundant
विकल्प
Boron
Chlorine
Potassium
Platinum
Radon
उत्तर
Chlorine.
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संबंधित प्रश्न
Some properties are listed in the following Table. Distinguish between metals and non-metals on the basis of these properties
| Properties | Metals | Non-metals |
| 1. Appearance | Lustrous | Dull |
| 2. Hardness | Hard | Soft |
| 3. Malleability | Can be beaten into thin sheets | Cannot be beaten into thin sheets |
| 4. Ductility | Can be drawn into wires | Cannot be drawn into wires |
| 5. Heat Conduction | Good conductors of heat | Poor conductors of heat |
| 6. Conduction of Electricity | Good conductors of electricity | Poor conductors of electricity |
Which property of copper and aluminium makes them suitable for making cooking utensils and boilers?
State three reasons (of which at least one must be chemical) for believing that sodium is a metal.
The electronic configurations of three elements A, B and C are as follows:
| A | 2, 8, 1 |
| B | 2, 8, 7 |
| C | 2, 4 |
(a) Which of these element is a metal?
(b) Which of these elements are non-metals?
(c) Which two elements will combine to form an ionic bond?
(d) Which two elements will combine to form a covalent bond?
(e) Which element will form an anion of valency 1?
Name a non-metal that is hardest naturally occurring substance
Name the metals present in the following alloys
Duralumin
Match the statements in Column A, with those in Column B .
| Column A | Column B | ||
| 1 | A metal used for making high quality mirrors . | a | Chlorine |
| 2 | A metal which neither malleable nor ductile. | b | Graphite |
| 3 | A non-metal,used in the sterilsation of water. | c | Iodine |
| 4 | A non-metal, whose deficiency can lead to disease like goitre. | d | Silver |
| 5 | A non -metal which can be used as dry lubricant. | e | Zinc |
State two important uses of following non-metal
Uses of oxygen
State two important uses of following non-metal
iodine
What is an alloy?
Name a liquid non-metal.
Select from the following ist:
`Fe_2O_3, , NO, PbO, Mn_2O_7`
Amphoteric oxide …………
Name:
Two metals which are liquid at room temperature
In which of the following industries, microbial enzymes are not used?
a) Glass industry.
b) Cheese industry
c) Tanning industry.
d) Paper industry.
Identify the odd term.
_______ is basic oxide.
Find the odd one out and give its explanation.
Oxygen, hydrogen, and sulphur are examples for
Alloys are homogeneous mixtures of a metal with a metal or non-metal. Which among the following alloys contain non-metal as one of its constituents?
Paheli bought a statue made up of copper. To her surprise, it acquired a dull green coating after a couple of months. Explain the reason.
