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Acids, Bases and Salts textual questions Chapter:- 2. Acids, Bases and Salts textual questions 1.Five solutions A, B, C, D and E when tested with universal indicator showed p H as 4, 1, 11, 7, and 9, respectively, which solution is (AS 1 ) (a) neutral (b) strongly alkaline (c) strongly acidic (d) weakly acidic (e) weakly alkaline Arrange the p H in increasing order of hydrogen ion concentration. Ans:- p H VALUE NATURE OF THE SUBSTANCE p H < 7 ACID p H < 7 and is closer to 0 STRONG ACID p H < 7 and is closer to 7 WEAK ACID p H > 7 BASE p H > 7 and is closer to 14 ...

Is matter pure Is matter pure? chapter-3 Textual Questions and Answers (click on questions to get the answers) 1. Which separation techniques will you apply for the separation of the following? (AS 1 ) a) Sodium chloride from its solution in water. b) Ammonium chloride from a mixture containing sodium chloride and ammonium chloride. c) Small pieces of metal in the engine oil of a car. d) Different pigments from an extract of flower petals. e) Butter from curd. f) Oil from water. g) Tea leaves from tea. h) Iron pins from sand. i) Wheat grains from husk. j) Fine mud particles suspended in water. Ans:- Mixture Separation techniques a) Sodium chloride from its solution in water. Evaporation b) Ammonium chloride from a mixture containing so...

9th class 1. Motion TQ chapter 1:-Motion Textual Questions motion textual questions 1. “She moves at a constant speed in a constant direction.” . Rephrase the same sentence in fewer words using concepts related to motion.(AS1) Ans:- She moves with uniform velocity. 2. In the figure given below distance vs time graphs showing motion of two cars A and B are given. Which car moves fast ? (AS1) Ans:- 1. Speed = distance/time         = slope of the graph distance, time graphs 2. Slope of distance time graphs represents speed of an object 3. Curve of car 'A' has more slope than 'B'. So, car ‘A’ moves fast. 3. Distinguish between speed and velocity. (AS1) Ans:- Speed Velocity 1. The distance travelled by the body in unit time is called spe...

chapter 1:- Heat Synopsis Videos TQs Bits short notes 1.Heat Heat is a form of energy which flows from the body at higher temperature to the body that has lower temperature. (from hot body to cold body.) Formula :- Q=ms∆t Where Q= heat (absorbed or lost) m = mass ∆t = temperature difference Units :- 1. joule (J) in S.I system) 2. calorie(cal) (in C.G.S system) 3. I cal = 4.186 joules. 5. Calorie: The amount of heat required to raise the temperature of 1 gram of water by 1 ° C is called calorie. 2.Temperature (T) 1. The degree of hotness or coldness is called temperature. 2. It depends on the average kinetic energy of the molecules of a system. 3. Units:- a. kelvin(K) (in S.I system) b. degree celsius(in C.G.S system) 4. Normal temperature of a healthy human is 98.6° F or 37° C o...