Class 10th science notes
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Science Case study based questions and Assertion and reason with Answers
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Question 1- Mention the type of chemical reaction that takes place and Write the chemical equation for each reaction when:
(i) A magnesium ribbon is burnt in air
(ii) Limestone is heated
(iii) Silver bromide is exposed to sunlight
(iv) Electricity is passed through acidified water
(v) Ammonia and hydrogen chloride are mixed with each other.
PYQ - 5 Marks
Answer 1- (i) When A magnesium ribbon is burnt in air 2Mg(s) + O2(g) → 2MgO(s): Combination Reaction (ii) When Limestone is heated CaCO3(s) → CaO(s) + CO2(g): Thermal Decomposition Reaction (iii) When Silver bromide is exposed to sunlight 2AgBr(s) → 2Ag(s) + Br2: Photolytic Decomposition Reaction (iv) When Electricity is passed through acidified water 2H2O(l) → 2H2(g) + O2(g): Electrolytic Decomposition reaction (v) When Ammonia and hydrogen chloride are mixed with each other. NH3(g) + HCl(g) → NH4Cl(s): Combination ReactionQuestion 2- Take 3 g of barium hydroxide in a test tube, now add about 2 g of ammonium chloride and mix the contents with the help of a glass rod. Now touch the test tube from outside. (i) What do you feel on touching the test tube? (ii) State the inference about the type of reaction occurred. (iii) Write the balanced chemical equation of the reaction involved.
PYQ - 3 Marks
Answer 2- (i) The test tube becomes cooler during the reaction because the reaction is endothermic (absorbs heat from surrounding). (ii) During the reaction, heat is absorbed. Hence, this reaction is an endothermic reaction. These reactions cause a cooling effect by lowering the temperature of their surroundings. (iii) The balanced chemical equation of the reaction involved is as follows: Ba(OH)2 + 2NH4Cl + Heat → BaCl2 + 2NH3 + 2H2O Question 3 - a. How is zygote formed? b. State the function of placenta in the mother’s body. c. At what interval the egg is formed in human female ovary? d. Name two STDs caused by bacterial infection. e. Why is prenatal sex determination prohibited?
PYQ - 5 Marks
Answer 3- a. Zygote is formed by the fusion of male and female gamete. b. Placenta is a special tissue through which the developing embryo/foetus gets nutrition from mother’s blood. It also transports wastes of the embryo into mother’s blood. c. Ovulation releases mature ovum from ‘ the ovary. It happens once during a menstrual cycle that is for roughly 28 days. d. STDs caused by bacterial infection are Gonorrhoea and Syphilis. e. Prenatal sex determination is misused and it may be the reason for female foeticide.📯 If more such questions needed than give reaction to this post ✈️📷📞
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To burn natural gas, we need to supply some amount of heat. Which of the following is correct regarding burning of natural gas?
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When hydrogen sulphide gas is passed through a blue solution of copper sulphate, a black precipitate of copper sulphide is obtained, and the sulphuric acid so formed remains in the solution. The reaction is an example of a:
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In a double displacement reaction such as reaction b/w sodium sulphate solution & barium chloride solution
I. Exchange of atoms take place
II. Exchange of ions take place III. A precipitate is produced IV. An insoluble salt is produced correct option is:
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Science sample paper with solution - total 10 sample papers
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