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Saturday, 22 May 2021
NCERT EXAMPLER CLASS 10 SCIENCE CHPATER 1 (CHEMICAL REACTIONS AND EQUATIONS )
PANDEY'S TUTORIALS
2. A solution of potassium chloride when mixed with silver nitrate solution, an insoluble white substance is formed. Write the chemical reaction involved and also mention the type of the chemical reaction.
3.Write the balanced chemical equations for the following reactions.
4.Why do fireflies glow at night?
5.Grapes hanging on the plant do not ferment but after being plucked from the plant can be fermented. Under what conditions do these grapes ferment? Is it a chemical or a physical change?
6.During the reaction of some metals with dilute hydrochloric acid, following observations were made.
7.A substance X, which is an oxide of a group 2 element, is used intensively in the cement industry. This element is present in bones also. On treatment with water, it forms a solution which turns red litmus blue. Identify X and also write the chemical reactions involved.
8.Why do we store silver chloride in dark coloured bottles?
9.A magnesium ribbon is burnt in oxygen to give a white compound X accompanied by emission of light. If the burning ribbon is now placed in an atmosphere of nitrogen, it continues to burn and forms a compound Y.
10.A silver article generally turns black when kept in the open for a few days. The article when rubbed with toothpaste again starts shining.
11.Write the balanced chemical equation for the following equations for the following reaction and identify the type of reaction in each case.
12.Complete the missing components/variables given as x and y in the following reactions :
13.Which among the following changes are exothermic or endothermic in nature?
14. Identify the reducing agent in the following reactions :
15.Identify the oxidising agent (oxidant) in the following reactions :
16.Ferrous sulphate decomposes with the evolution of gas having a characteristic order of burning sulphur. Write the chemical reaction involved and identify the type of reaction.
17.Which among the following are physical or chemical changes
18.Write a balanced chemical equation for each of the following reactions and also classify them.
19.Balance the following chemical equations arid identify the type of chemical reaction:
20.Zinc liberates hydrogen gas when reacted with dilute hydrochloric acid, whereas copper does not. Explain why?
21.On heating blue coloured powder of copper (II) nitrate in boiling tube, copper oxide (black), oxygen gas and a brown gas ‘X’ is formed.
22.Give the characteristic tests for the following gases.
23.What happens when a piece of
24.What happens when zinc granules are treated with dilute solutions of
25.On adding a drop of barium chloride solution to an aqueous solution of sodium sulphite, white precipitate is obtained.
26.You are provided with two containers made up of (A) copper and (B) aluminium. You are also provided with solutions of (a) dilute HCl (b) dilute
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NCERT EXAMPLER CLASS 10 SCIENCE CHPATER 1 (CHEMICAL REACTIONS AND EQUATIONS )
PANDEY'S TUTORIAL S NCERT Exampler ...
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PANDEY'S TUTORIAL S NCERT Exampler ...