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प्रश्न
Hydrogen is not a metal but still it has been assigned a place in the reactivity series of metals. Why?
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उत्तर
Hydrogen is not a metal, but it has been assigned a place in the reactivity series of metals because, like metals, it also loses electrons and forms positive ions, H+.
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संबंधित प्रश्न
.................... liberated when acetic acid reacts with sodium metal.
(a) Hydrogen
(b) Chlorine
(c) Oxygen
(d) Nitrogen
Metal A has electronic configuration (2, 8, 1) and metal B has (2, 8, 8, 2). Which is more reactive? Why? Identify these metals.
What would you observe when zinc is added to a solution of iron (II) sulphate? Write the chemical reaction that takes place.
Why are metals called electropositive elements?
From amongst the metals sodium, calcium, aluminium, copper and magnesium, name the metal:
- which reacts with water only on boiling, and
- another which does not react even with steam.
What changes in the colour of iron nails and copper sulphate solution do you observe after keeping the iron nails dipped in copper sulphate solution for about 30 minutes?
A copper coin is kept immersed in a solution of silver nitrate for some time. What will happen to the coin and the colour of the solution?
Calcium is a ______ reactive metal than sodium.
With the help of examples, describe how metal oxides differ from non-metal oxides.
Explain why, metals usually do not liberate hydrogen gas with dilute nitric acid.
Name another metal oxide which behaves like aluminium oxide.
What happens when a metal reacts with dilute hydrochloric acid? Explain with the help of an example.
Write the equation for the reaction of:
Magnesium with dilute hydrochloric acid.
Name the products formed in the given case. Also indicate the physical states of all the substances involved.
What is meant by the reactivity series of metals?
An element X forms two oxides XO and XO2. The oxide XO is neutral but XO2 is acidic in nature. The element X is most likely to be:
(a) sulphur
(b) carbon
(c) calcium
(d) hydrogen
State and explain the reaction, if any, of the following metals with a solution of copper sulphate:
(a) Gold
(b) Copper
(c) Zinc
(d) Mercury
What are noble gases
Where does the metal aluminium, used in the thermit process, occurs in the reactivity series of metals?
An element X is soft and can be cut with a knife. This is very reactive to air and cannot be kept open in the air. It reacts vigorously with water. Identify the element from the following.
A cable manufacturing unit tested few elements on the basisof their physical properties.
| Properties | W | X | Y | Z |
| Malleable | Yes | No | No | Yes |
| Ductile | Yes | No | No | Yes |
| Electrical conductivity | Yes | Yes | Yes | No |
| Melting Point | High | Low | Low | High |
Which of the above elements were dicarded for usage by the company?
