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प्रश्न
Explain why, metals usually do not liberate hydrogen gas with dilute nitric acid.
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उत्तर
Nitric acid is a powerful oxidising agent. So as soon as hydrogen gas is produced due to the action of nitric acid on metals, it oxidises hydrogen to form water and reduces itself to nitrogen oxides. Hence, hydrogen gas is not liberated in the reaction.
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संबंधित प्रश्न
Name the following:
Metals which forms an amphoteric oxide.
Samples of four metals A, B, C and D were taken and added to the following solution one by one. The results obtained have been tabulated as follows.
| Metal | Iron (II) sulphate | Cooper (II) sulphate | Zinc sulphate | Silver nitrate |
| A | No reaction | Displacement | ||
| B | Displacement | No reaction | ||
| C | No reaction | No reaction | No reaction | Displacement |
| D | No reaction | No reaction | No reaction | No reaction |
Use the Table above to answer the following questions about metals A, B, C and D.
- Which is the most reactive metal?
- What would you observe if B is added to a solution of copper (II) sulphate?
- Arrange the metals A, B, C and D in the order of decreasing reactivity.
Write the electron-dot structures for sodium, oxygen and magnesium.
State whether the following statement is true or false:
Non-metals react with dilute acids to produce a gas which burns with a ‘pop’ sound.
What name is given to those metal oxides which show basic as well as acidic behaviour?
Which of the two metals is more reactive?
Copper or silver
How would you show that silver is chemically less reactive than copper?
Complete and balance the following equation:
\[\ce{Na + O2 ->}\]
What happens when a rod of zinc metal is dipped into a solution of copper sulphate? Give chemical equation of the reaction involved.
Write the equation for the reaction of Zinc with dilute hydrochloric acid.
Name the products formed. Also indicate the physical states of all the substances involved.
Which non-metal has been placed in the reactivity series of metals?
The least reactive metal among the following is:
(a) sodium
(b) silver
(c) copper
(d) lead
Which one of the following four metals would be displaced from the solution of its salt by the other three metals?
(a) Zn
(b) Ag
(c) Cu
(d) Mg
An element E forms an oxide E2O. An aqueous solution of E2O turns red litmus paper blue.
(a) What is the nature of the oxide E2O?
(b) State whether element E is a metal or a non-metal.
(c) Give one example of an element like E.
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
If A, B, C, D, E, F, G, H, I, J and K represent metals in the decreasing order of their reactivity, which one of them is most likely to occur in a free state in nature?
Name a metal which does not react with cold as well as hot water but reacts with steam.
What is the characteristic of the electronic configuration of noble gases?
