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Science · 2024 · 4 marks
CBSE 2024 · Region 4 · Set 1 · Q37
Three metal samples of magnesium, aluminium and iron were taken and rubbed with sand paper. 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 :(a)When 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 ?(b)Which metal did not react with dilute hydrochloric acid ? Give reason.(c)Why is hydrogen gas not evolved when a metal reacts with dilute nitric acid ? Name the ultimate products formed in the reaction.(ii)Name the type of reaction on the basis of which reactivity of metals is decided. You have two metals X and Y. How would you decide which is more reactive than the other ?
Three metal samples of magnesium, aluminium and iron were taken and rubbed with sand paper. 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 :
(a)
When 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 ?
(b)
Which metal did not react with dilute hydrochloric acid ? Give reason.
(c)
Why is hydrogen gas not evolved when a metal reacts with dilute nitric acid ? Name the ultimate products formed in the reaction.
(ii)
Name the type of reaction on the basis of which reactivity of metals is decided. You have two metals X and Y. How would you decide which is more reactive than the other ?
Marking-scheme solution
(a) In the test tube containing magnesium.
(b) All three metals react with HCl because they are more reactive than hydrogen.
(c) (i)Because \(\displaystyle \mathrm{HNO}_{3}\) is a strong oxidizing agent and oxidizes the \(\displaystyle \mathrm{H}_{2}\) produced to water.
Ultimate products are water, oxides of nitrogen.
OR
(ii) • Displacement Reaction
If metal X displaces metal Y from its salt solution it is more reactive than Y or vice versa.
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CBSE Class 10 Science past-paper question from the 2024board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.