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प्रश्न
Give one example each of which illustrates the following characteristics of a chemical reaction:
evolution of a gas
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उत्तर
When Zinc reacts with dil. sulphuric acid. Hydrogen gas is evolved, with an effervescence
\[\ce{\underset{\text{zinc}}{Zn} +\underset{\text{dil.suphuric acid}}{H2SO4} -> \underset{\text{zinc sulphate}}{ZnSO4} + \underset{\text{hydrogen}}{H2}}\]
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संबंधित प्रश्न
What do you observe when dilute sulphuric acid is added to granulated zinc?
What do you observe when silver nitrate is added to a solution of sodium chloride?
Write chemical equation for the event.
Aluminium came in contact with air.
Write the chemical equation for the event.
A reaction was brought about between ferric oxide and aluminium.
Complete the statement by filling in the blank with the correct word:
The metal which reacts with steam and the reaction is reversible is ________.
In preparation of Aqua regia hydrochloric acid and _______ acid are mixed.
Explain the following reaction with the balanced equation.
Sulphur burns in air
Which among the following statements is incorrect for magnesium metal?
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?
