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प्रश्न
_______ is basic oxide.
विकल्प
CO2
K2O
SO2
Al2O3
उत्तर
K2O is basic oxide.
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संबंधित प्रश्न
Give an example of a metal which is the best conductor of heat.
Explain the meaning of malleable.
Name two metals which are used for making electric wires.
State any five physical properties of non-metals.
Name two physical properties of sodium in which it's behaviour is not as expected from it's classification as metal.
State three reasons (of which at least one must be chemical) for believing that sulphur is a non-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 which is ductile
Select from the following ist:
`Fe_2O_3, , NO, PbO, Mn_2O_7`
Acidic oxide ………………
Name:
two metallic oxides which are amphoteric
Explain how the activity series accounts for each of the following:
reaction with water
Explain the term Gangue .
Which metal occurs as a halide also gives the name of their respective ore.
A metallic oxide which cannot be reduced by normal reducing agents:
How are metals like sodium, potassium, and calcium obtained? Give equations.
Give the common name and chemical name of an ore of:
(a) zinc (b) aluminium (c) iron.
Give a reason why – properties of metals are related to their activity or reactivity series of metals. Explain the same with reference to potassium and iron in the series.
Find the odd one out and give its explanation.
