Acids Bases and Salts

1. Draw a neat diagram showing Base solution in water conducts electricity and label the parts of the diagram. (AS 5)                                                                                             4 Marks
2. Draw a neat diagram and identify the parts of the experiments that shows the reaction of Zn granuals with dil. HCl. (AS 5)                                                                                 4 Marks
3. Draw a neat diagram and identify the parts of the experiment that shows the reaction of carbonates and metal hydrogen carbonates with acids. (AS 5)                                   4 Marks

From the above table (pH - Scale) identify the limits of strong, weak acids as well as bases and neutral substances. (AS 5)                                                                                        2 Marks
5. Label the parts of the adjacent figure.
(AS 5)                                          2 Marks

a) What does the above figure indicate? Write the chemical equation.
b) Lable the parts of the above figure. (AS 5) 4 Marks

a) What does the adjacent figure shows? Label the parts.
b) Write a balanced equation for the reaction. (AS 5) 4 Marks

a) What does the adjacent figure shows?
b) Label the parts. (AS 5) 2 Marks

What does the given symbol indicates? (AS 5) 1 Mark

a) What does the adjacent figure indicate?
b) Label the parts? (AS 5)                                                                                                 2 Marks
11. You are provided with three test tubes containing distilled water, an acid and a base solution respectively. If you are given only Red litmus paper, how do you identify the contents of each test tube? (AS 1)                                                                                                2 Marks
12. When a Sodium compound reacts with dilute Hydrochloric acid a gas is released with effervescence. The gas evolved put off a burning candle, turns lime water milky. If one of the compounds formed in this reaction is Sodium chloride.
    i) Name the gas evolved?
    ii) Why does the candle puts off?
  iii) Write a balanced equation for the reaction?
    iv) Name the precipitate formed when the lime water turns milky? (AS 4)         4 Marks
13. How would you verify experimentally that acid solution in water or basic solution in water conducts electricity? Explain. (AS 3)                                                                             4 Marks
14. Write an experiment to find the change of colour in the reaction of an acid with a base (Neutralization) reaction. (AS 3)                                                                                      2 Marks

15. Write an experiment to show that dissolving of an acid in water is an exothermic process (or) endothermic process. (AS 3)                                                                                          2 Marks

16. How do you test your soil? (AS 3)                                                                            2 Marks

17. Zn granuals added to HCl and NaOH in different reactions. What kind of common product will be get in both reactions? (AS 3)                                                                                    1 Mark

18. Mention the precautions taken while changing concentrated acids into dilute acids in laboratory? (AS 3)                                                                                                             1 Mark

19. How would you prepare a litmus paper using the materials available to you? (AS 3) 1 Mark

20. Which gas is generally liberated when a metal reacts with an acid. How could you identify the gas? (AS 3)                                                                                                                       1 Mark

21. A student has taken three different solutions in three different test tubes A, B and C and added few drops of universal indicator in each of them. He observed that solution in test tube A turned to green. Solution B turned to red, and solution C turned to purple. Arrange the solutions in A, B, C in ascending order according to their pH values. (AS 1)                               1 Mark

22. What is used for disinfecting drinking water to make it free of germs? Write its chemical formula? (AS 6)                                                                                                                   1 Mark

23. If a person in your family is suffering from acidity problem, what advice would you like to give him? (AS 6)                                                                                                                         1 Mark

24. What type of reaction takes place in stomach when an antacid tablet is consumed? Write the substance that used in antacid and write its formula. (AS 1)                                          2 Marks

25. Which substances are used as olfactory indicators? (AS 1)                                        1 Mark

26. There will be variation in the pH values of saliva before meals and after meals. Predict the reasons for it. (AS 2)                                                                                                                2 Marks

27. Why do we use the tooth paste with basic nature? (AS 1)                                         1 Mark

28. Why stinging hair of nettle plant cause severe burning pain when a person touches it? What is its remedy? (AS 6)                                                                                                  2 Marks

29. A student prepare a cake in her house, but it is hard and small in size. Which ingredient has she forgotten to add to make it soft. Explain giving reasons. (AS 1)                        2 Marks

30. How many water molecules are there in the salts containing crystallisation of water given below?
      i) Gypsum
      ii) Washing Soda
      iii) Copper sulphate and
      iv) Epsom salt

31. Ca(OH)₂ + Cl₂ → CaOCl₂ + H₂O
i) Name the main product formed in the above reaction.
ii) Mention the uses of this product. (AS 4)                                                                    2 Marks

32. Observe the following table and answer the questions given below:

_^Substance	_{^{Rain Water}}	_{^{Lemon Juice}}	_{^{Saliva (after meals)}}	_^Blood	_{^{Distilled Water}}
_{^{pH value}}	_⁵	_^2.4	_^5.8	_^7.3	_⁷

i) What is the nature of rain water? Acidic or Basic?
ii) What happens if the pH value of Saliva decrease? Give reasons. (AS 4) 2 Marks

33. Observe the following table to answer the questions given below.

^Substance	^H₂SO₄	^HCl	^H₂O	^NH₄OH	^NaOH	^KOH
^{pH value}	²	¹	⁷	⁹	¹³	¹²
^Nature	^Acidic	^Acidic	^Neutral	^Basic	^Basic	^Basic

i) Which is the substance of low pH value? Mention its pH value?
ii) What is the nature of H₂O? Give reasons?
iii) When pH Indicator is added to H₂SO₄, to which colour it changes?
iv) Which is the weak base among the substances and give reasons for it? (AS 4) 4 Marks

34. Observe the figure given and answer the questions. (AS 4) 4 Marks

i) What does the above figure indicate?
ii) Write an equation to show the formation of NaOH?
iii) Expand PVC.
iv) What is used to clean steel?

35. How many types of salts are there according to pH values? What are those? Give examples, and explain that how the salts are formed? (AS 1) 4 Marks

36. If hydrated salts like Zypsum was not founded then imagine the consequences? (AS 2)
2 Marks

Posted Date : 13-11-2020

గమనిక : ప్రతిభ.ఈనాడు.నెట్‌లో కనిపించే వ్యాపార ప్రకటనలు వివిధ దేశాల్లోని వ్యాపారులు, సంస్థల నుంచి వస్తాయి. మరి కొన్ని ప్రకటనలు పాఠకుల అభిరుచి మేరకు కృత్రిమ మేధస్సు సాంకేతికత సాయంతో ప్రదర్శితమవుతుంటాయి. ఆ ప్రకటనల్లోని ఉత్పత్తులను లేదా సేవలను పాఠకులు స్వయంగా విచారించుకొని, జాగ్రత్తగా పరిశీలించి కొనుక్కోవాలి లేదా వినియోగించుకోవాలి. వాటి నాణ్యత లేదా లోపాలతో ఈనాడు యాజమాన్యానికి ఎలాంటి సంబంధం లేదు. ఈ విషయంలో ఉత్తర ప్రత్యుత్తరాలకు, ఈ-మెయిల్స్ కి, ఇంకా ఇతర రూపాల్లో సమాచార మార్పిడికి తావు లేదు. ఫిర్యాదులు స్వీకరించడం కుదరదు. పాఠకులు గమనించి, సహకరించాలని మనవి.