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तमिलनाडु बोर्ड ऑफ सेकेंडरी एज्युकेशनएसएसएलसी (अंग्रेजी माध्यम) कक्षा ८

In acidic solutions blue litmus changes into ______ colour.

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प्रश्न

In acidic solutions blue litmus changes into ______ colour.

विकल्प

  • blue

  • green

  • red

  • white

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उत्तर

In acidic solutions, blue litmus changes into red colour.

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अध्याय 14: Acids and Bases - Exercises [पृष्ठ १६४]

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सामाचीर कलवी Science [English] Class 8 TN Board
अध्याय 14 Acids and Bases
Exercises | Q I. 3. | पृष्ठ १६४

संबंधित प्रश्न

You have been provided with three test tubes. One of them contains distilled water and the other two contain an acidic solution and a basic solution, respectively. If you are given only red litmus paper, how will you identify the contents of each test tube?


Dorji has a few bottles of soft drink in his restaurant. But, unfortunately, these are not labelled. He has to serve the drinks on the demand of customers. One customer wants acidic drink, another wants basic and third one wants neutral drink. How will Dorji decide which drink is to be served to whom?


How is an acid prepared from a non metal and a base from a metal? Give equation.


HCl, HNO3, C2H5OH, C6H12O6 all contain H atoms but only HCl and HNO3 show acidic character. Why?


Paheli observed that most of the fish in the pond of her village were gradually dying. She also observed that the waste of a factory in their village is flowing into the pond which probably caused the fish to die.

  1. Explain why the fish were dying.
  2. If the factory waste is acidic in nature, how can it be neutralised?

Which of the following metal does not react with sodium hydroxides?


Complete the following equation.

Zn + ______ → Na2ZnO2 + H2 ↑


You are supplied with five solutions: A, B, C, D and E with pH values as follows: A = 1.8, B = 7, C = 8.5, D = 13, and E = 5

Classify these solutions as neutral, slightly or strongly acidic and slightly or strongly alkaline.

Which solution would be most likely to liberate hydrogen with powdered zinc metal. Give a word equation for each reaction.


Select an oxide which dissolves in water forming an acid.


Consider the acidity of the carboxylic acids:

(1) PhCOOH

(2) o-NO2C6H4COOH

(3) p-NO2C6H4COOH

(4) m-NO2C6H4COOH


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