AP SSC 10th Class Physical Science Chapter 4 Solution – Acids, Bases and Salts
Andhra Pradesh SSC 10th Class Physical Science Chapter 4 Acids, Bases and Salts Solution for AP SSC 10th Class Physics/Chemistry Exam. Lots of Students of Andhra Pradesh Board will search on internet for Andhra Pradesh Class 10 Physical Science Textbook Solution or Study Material for AP SSC 10th exam. Here you search will end! Here in this page we have provided for all question answer for Chapter 4 Acids, Bases and Salts.
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AP 10th Class Physics Chapter 4 Acids, Bases and Salts Solution
(1) Five solutions A, B, C, D and E when tested with universal indicator showed pH as 4, 1, 11, 7 and 9, respectively, which solution is (AS1)
(a) neutral
(b) Strongly alkaline
(c) Strongly acidic
(d) Weakly acidic
(e) Weakly alkaline
Arrange the pH in increasing order of hydrogen ion concentration.
Ans: – A-> (d) weakly acidic; B -> (c) strongly acidic; C-> (b) strongly alkaline; D-> (a) neutral. ; E-> (e) weakly alkaline;
So the order of increasing hydrogen concentration is B >A > D> E> C.
(2) What is a neutralization reaction? Give two examples. (AS1)
Ans: –When acid reacts with the base then it produces salt and water this reaction is called the neutralized reaction.
Example: – HCl and NaOH reaction, Mg (OH) 2 and HCl reaction.
(3) What happens when an acid or base is mixed with water? (AS1)
Ans: –After the reaction between acid or base to the water ion concentration decreases. This type of solution is called dilution.
(4) Why does tooth decay start when the pH of mouth is lower than 5.5? (AS1)
Ans: –After eating if we don’t clear our mouth properly the remaining part of food becomes acidic after reaction which is harmful to our health especially for teeth.
(5) Why does not distilled water conduct electricity? (AS2)
Ans: – In distilled water there have no ion particles. So it couldn’t conduct electricity.
(6) Dry hydrogen chloride gas does not turn blue litmus to red whereas hydrochloric acid does. Why? (AS1)
Ans: – In dry hydrogen chloride there has no hydrogen ion is produced but HCl produce hydrogen ion. So HCl is used to turn blue litmus to red.
(7) Why pure acetic acid do becomes turn blue litmus to red? (AS2)
Ans: –In pure acetic acid there present intermolecular hydrogen bonding so no dissociation occurs. So it doesn’t turn blue litmus to red.
(8) A milkman adds a very small amount of baking soda to fresh milk. (AS2)
(a) Why does he shift the pH of the fresh milk from 6 to slightly alkaline?
(b) Why does this milk take a long time to set as curd?
Ans: –(a) For the shifting of fresh milk PH 6 to slightly alkaline the milk will not become sour as with the help of baking soda with the formation of lactic.
(b) At first the present lactic acid is reduced by PH then the PH helps the milk to set as curd. So by these process sometimes required.
(9) Plaster of Paris should be stored in moisture – proof container. Explain why? (AS2)
Ans: –As we know in the presence of moisture plaster of Paris become solid so it should be kept in a moisture proof container.
(11) Fresh milk has a pH of 6. Explain why the pH changes as it turns into curd? (AS3)
Ans: –To produce curd the milk changed into lactic acid which is more acidic than the milk. So PH value changes from 6 to more acidic.
(12) What is meant by “water of crystallization” of a substance? Describe an activity to show thewater of crystallization. (AS3)
Ans: –After taking some crystals of copper sulphate in the test tube if we heat the test tube then we will see the blue colour of the copper sulphate crystal become white. So by this test, we cansay it’sthe water of crystallization.
(13) Equal lengths of magnesium ribbons are taken in test tubes A and B. Hydrochloric acid is added totest tube A, while acetic acid is added to test tube B. Amount and concentration of both the acids is same. In which test tube will the fizzing occur more vigorously and why?(AS4)
Ans: –As acetic acid is weak acid whereas HCl is strong acid so by reaction with magnesium ribbon in test tube A there will be fizzed more vigorously than test tube B.
(14) Draw a neat diagram showing acid solution in water conducts electricity. (AS5)
Ans: – In aqueous solution acid dissociate in into ions. So these ion conduct electricity
(15) How do you prepare your own indicator using beetroot? Explain. (AS5)
Ans: –The following steps would be taken to prepare own indicator
- After peeling the beetroot make a paste of it by using a grinder.
- Then add some water and filter it. Then take the juice.
- Mixed orange juice to it.
After completing this process we will see the colour changes.
(16) How does the flow of acid rain into a river make the survival of aquatic life in a river difficult?(AS7)
Ans: –The aquatic animal in the river be safe in the PH between 7- 7.8. As the PH of acid rain is 5.6 or something so this acidic water became harmful for river aquatic animals.
(17) What is baking powder? How does it make the cake soft and spongy? (AS7)
Ans: –The composition of baking powder is tartaric acid and baking soda. After adding water tobaking powder the baking soda react with tartaric acid and produced CO2. The liberated CO2 makes the cake soft.
(18) Give two important uses of washing soda and baking soda. (AS7)
Ans: –Washing soda is used to reduce the permanent hardness of the water. Baking soda is used to prepare the cake.
FILL IN THE BLANKS
(1) (i) _______sour test_____ taste is a characteristic property of all acids in an aqueous solution.
(ii) Acids react with some metals to produce __H2__ gas.
(iii) Because aqueous acid solutions conduct electricity, they are identified as __conductors____.
(iv) Acids react with bases to produce a ___salt_____ and water.
(v) Acids turn ___blanks_________ different colours.
(2) (i) Bases tend to taste ___bitter__________ and feel _ soapy___.
(ii) Like acids, aqueous basic solutions conduct __electricity___, and are identified as__ electrolytes __.
(iii) Bases react with _____acid_________ to produce a salt and ___water__.
(iv) Bases turn _blue_, _indigo_, _violet_ different colours.
(3) Match the following:
(a) Plaster of Paris | (c) 1) CaO Cl2 |
(b) Gypsum. | (d) 2) NaHCO3 |
(c) Bleaching powder | (e) 3) Na2CO3 |
(d) Baking soda. | (a) (4) CaSO4. ½ H2O |
(e) Washing soda | (b) CaSO4. 2 H2O |
MULTIPLE CHOICE Q
(1) The colour of methyl orange indicator in acidic medium is … red……
(2) The colour of phenolphthalein indicator in basic solution is …… pink…
(3) Colour of methyl orange in alkali conditions?
–>(b) yellow.
(4) A solution turns red litmus blue, its pH is likely to be … (d) 10……
(5) A solution reacts with crushed egg-shells to give a gas that turns lime-water milky the solution contains …… (b) HCl…
(6) If a base dissolves in water by what name is it better known? → (d) alkali.
(7) Which of the following substances when mixed together will produce table salt? →
(b) Hydrochloride acid and Sodium hydroxide.
(8) What colour would hydrochloric acid (pH=1) turn universal indicator?
–>(d) red.
(9) Which one of the following types of medicines is used for treating indigestion?
–>(c) antacid.
(10) What gas is produced when magnesium is made to react with hydrochloric acid?
–>(a) Hydrogen.
(11) Which of the following is the most accurate way of showing neutralization?
→ (d) Acid+ Base → neutral solution.