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प्रश्न
Arrange the following as per the instruction given in the bracket:
Al, K, Mg, Ca (decreasing order of its reactivity)
उत्तर
K > Ca > Mg > Al
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संबंधित प्रश्न
What do you observe when dilute sulphuric acid is added to granulated zinc?
What do you observe when ferrous sulphate solution is added to an aqueous solution of sodium hydroxide.
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When a piece of copper is added to silver nitrate solution, it turns ............in colour.
What do you observe when Magnesium ribbon is burnt in oxygen.
Write chemical equation for the event.
Iron filings are dropped in aqueous solution of copper sulphate.
With reference to Water explain with suitable examples of how the reactivity of the metals could be differentiated.
Give a balanced equation for the reversible catalytic reaction involving nitrogen as one of the reactants.
Explain the following
- Reactivity of Al decreases if it is dipped in HNO3
- Carbon cannot reduce the oxides of Na or Mg
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- Iron articles are galvanised.
- Metals like Na, K, Ca and Mg are never found in their free state in nature.
An element A burns with golden flame in air. It reacts with another element B, atomic number 17 to give a product C. An aqueous solution of product C on electrolysis gives a compound D and liberates hydrogen. Identify A, B, C and D. Also write down the equations for the reactions involved.
Three metal samples of magnesium, aluminium and iron were taken and rubbed with sandpaper. These samples were then put separately in test tubes containing dilute hydrochloric acid. Thermometers were also suspended in each test tube so that their bulbs dipped in the acid. The rate of formation of bubbles was observed. The above activity was repeated with dilute nitric acid and the observations were recorded.
Answer the following questions:
(i) When the activity was done with dilute hydrochloric acid, then in which one of the test tubes was the rate of formation of bubbles the fastest and the thermometer showed the highest temperature?
(ii) Which metal did not react with dilute hydrochloric acid? Give reason.
(iii) Why is hydrogen gas not evolved when a metal reacts with dilute nitric acid? Name the ultimate products formed in the reaction.
OR
Name the type of reaction on the basis of which the reactivity of metals is decided. You have two metals X and Y. How would you decide which is more reactive than the other?
