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Two wires X and Y are of equal length and have equal resistances. If the resistivity of X is more than that of Y, which wire is thicker and why ? For the electric circuit given below calculate : 30 11 (i) Current in each resistor (ii) Total current drawn from the battery and (iii) Equivalent resistance of circuit (a) While diluting an add, why is it recommended that the add should be added to water and not water to the acid ? (b) Explain why aqueous solution of an add conducts electricity. (c) You have four solutions A, B, C and D. The pH of solution A is 6,B is 9, C is 12 and D is 7. (i) Identify the most acidic and the moat basic of the solutions. (ii) Arrange the above four solutions in the increasing order of their lir ion concentration. (iii) State the change in colour of pH paper on dipping in solution C and D. CBSE Class X Science LA (5 Marks) |
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Answer» Explanation:Two wires X and Y are of equal length and have equal resistances. X - R₁ & Y - R₂R₁ = ρ₁ L₁ /A₁R₂ = ρ₂ L₂ /A₂R₁ = R₂ L₁ = L₂ = L=> ρ₁ L /A₁ = ρ₂ L /A₂=> ρ₁ /A₁ = ρ₂ /A₂=>ρ₁/ρ₂ = A₁ /A₂ρ₁ > ρ₂=> A₁ > A₂Wire X is thickerWhile Diluting an acid , if we ADD water in acid then it will make very much concentrated acidic solution which may boil and cause harm to the person performing actions.Thats why acid is added in water You have four solutions A, B, C and D. The pH of solution A is 6, B is 9, C is 12 and D is 7.The pH scale ranges from 0 to 14. pH of 7 is neutral. A pH less than 7 is acidic. A pH greater than 7 is basic.A is most acidicC is most basic |
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