acid base and salts assignment pdf

CBSE Class 10 Science Acids Bases and Salts Assignment Set B

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Assignment for Class 10 Science Chapter 2 Acids Bases Salts

Class 10 Science students should refer to the following printable assignment in Pdf for Chapter 2 Acids Bases Salts in Class 10. This test paper with questions and answers for Class 10 Science will be very useful for exams and help you to score good marks

Chapter 2 Acids Bases Salts Class 10 Science Assignment

Question. Which one of the following can be used as an acid– base indicator by a  visually impaired student? (A) Litmus (B) Turmeric (C) Vanilla essence (D) Petunia leaves Answer : C

Question. What is formed when zinc reacts with sodium hydroxide? (a) Zinc hydroxide and sodium (b) Sodium zincate and hydrogen gas (c) Sodium zinc-oxide and hydrogen gas (d) Sodium zincate and water Answer : B

Question. Which of the following statement is correct about an aqueous solution of an acid and of a base? (i) Higher the pH, stronger the acid (ii) Higher the pH weaker the acid (iii ) Lower the pH ,stronger the base (iv) Lower the pH, weaker the base (a) i & iii (b) ii & iii (c ) I & iv (d) ii & iv Answer : D

Question. Tooth enamel is made up of (a) calcium phosphate (b) calcium carbonate (c) calcium oxide (d) potassium sulphate Answer : A

Question. Sodium hydroxide turns phenolphthalein solution (a) pink (b) yellow (c) colourless (d) orange Answer : A

Question. Which one of the given is true, if a substance has a pH value of 7? (a) The substance is a base (b) The substance is an acid (c) The substance is a neutral substance (d) Either (A) or (B) Answer : C

Question. An aqueous solution turns red litmus solution blue. Excess addition of  which of the following solution would reverse the change? (a) Baking powder (b) Lime (c) Ammonium hydroxide solution (d) Hydrochloric acid Answer : D

Question. Rain is called acid rain when its: (a) pH falls below 7 (b) pH falls below 6 (c) pH falls below 5.6 (d) pH is above 7 Answer : C

Question. When copper oxide and dilute hydrochloric acid react, colour changes to (a) white (b) bluish-green (c) blue-black (d) black Answer : B

Question. Generally, when certain metals react with an acid they release gas. (a) Nitrogen (b) Oxygen (c) Hydrogen d) Argon Answer : C

True or False :

Question. The more alkaline a solution, the more is the pH. Answer:  True

Question. Methyl orange indicator gives red colour in acidic solution and yellow colour in basic solution. Answer:  True

Question. All the organic acids are strong acids.  Answer:  False

Question. The dilution of a concentrated acid should always be done by adding concentrated acid to water gradually with stirring. Answer:  True

Question. Glucose solution conduct electricity. Answer:  False

Question. The strength of an acid or base is measured on a scale of numbers called pH paper.  Answer:  False

Fill in the blanks :

Question. Potassium nitrate has pH value equal to …………. . Answer :  7 or seven

Question. Use of mild base like …………. on the bee-stung area gives relief. Answer :  baking soda

Question. …………. is one of the raw materials for the production of baking soda. Answer :  Sodium chloride

Question. Acids turn …………. litmus solution…………. . Answer :  blue, red

Question. The presence of …………. Ca in acids is responsible for their acidic properties. Answer :  H +

Question. One of the constituents of baking powder is sodium hydrogen carbonate, the other constituent is _____________ . Answer :  tartaric acid

Question. The salts of carbonic acids are called _____________ . Answer :  carbonates

Question. Mixing an acid or base with water results in decrease in the concentration of per unit volume. This process is called Answer :  OH– ions/H 3 O +  ions, dilution

Question. pH of basic solution is always …………. than 7. Answer :  more/greater

Question. The three most common indicators to test for acid and bases are litmus _____________ and _____________ . Answer :  methyl orange, phenolphthalein

MCQ Questions for NCERT Class 10 Science Acids Bases and Salts

Very Short Question :

Question. How will you test for the gas which is liberated when hydrochloric acid reacts with an active metal?  Answer:  Bring a burning matchstick near the gas. It bums with ‘pop’ sound showing that it is hydrogen.

Question. Which gas is evolved when sodium hydroge-ncarbonate reacts with dilute hydrochloric acid? Answer:  Carbon dioxide gas is evolved.

Question. What is the colour of turmeric in soap solution? Answer:  Reddish-brown.

Question. What will happen to red litmus solution when it is added to bitter gourd extract? Is it acidic or basic? Answer:  It changes to blue. It is basic in nature.

Question. A few drops of sulphuric acid is added to water before electrolysis, why? Answer:  It makes water better conductor.

Question. What are phenolphthalein and methyl orange? Answer:  Synthetic indicators

Question. Which planet contains yellowish clouds of sulphuric acid? Answer:  Venus.

Question. What is the colour of litmus in a solution of ammonium hydroxide? Answer:  Red litmus will turn blue in ammonium hydroxide.

Question. What is litmus solution? Answer:  It is purple dye which is extracted from a plant ‘lichen’. It is used as acid-base indicator.

Question. Which gas is evolved when metal carbonates or metal hydrogen carbonate reacts with dilute acids? Answer:  CO 2 (g)

Question :  i. A chemical compound X is used in glass and soap industry. Identify the compound and give its chemical formula. ii. How many molecules of water of crystallisation are present in compound X? iii. How will you prepare the above compound starting from sodium chloride? Write all relevant equations involved in the process. Answer :  i. The compound (X) is washing soda. Its chemical formula is Na 2 CO 3  .10H 2 O ii. Ten molecules of water of crystallisation are present in this compound. iii. Ammonia and carbon dioxide gas in passed through brine (or concentrated sodium chloride solution) then a mixture of NaHCO 3  and NH 4 Cl is formed.

Question : a) Acids are sour in taste. Is it a way to find whether a substance is an acid or a base?

b) What is other physical test?

c) Any test with solid acid?

d) Can you check the evolution of CO 2 chemically?

Question : a) What are acids?

b) Can presence of H+ ion in water be estimated? How?

c) How is pH related to strength of an acid?

d) Name one strong acid and one weak acid

Question : a) What are salts?

b) How many types of salts are formed?

c) What are neutral salts?

d) What do you mean by acidic salts?

e) Define basic salts.

f) Give the corresponding acid and base from which sodium carbonate is formed

Question : a) What is common salt?

b) Why does common salt become moist in rainy season?

c) How is it used as a freezing mixture?

d) Name two important laboratory chemicals prepared from common salt on large scale.

Question : a) What is washing soda?

b) Name the process by which sodium carbonate is manufacture.

c) What are the raw materials used in the preparation of washing soda?

d) Sodium carbonate is obtained from another carbonate on heating. Name it.

Question : a) Name the substance used for bleaching cotton and wood pulp in textiles.

b) What is its chemical name?

c) How is it manufactured?

d) What is slaked lime?

e) Why does bleaching powder smell of chlorine?

CBSE Class 10 Science Chapter 2 Acids Bases Salts Assignment

We hope you liked the above assignment for Chapter 2 Acids Bases Salts which has been designed as per the latest syllabus for Class 10 Science released by CBSE. Students of Class 10 should download and practice the above Assignments for Class 10 Science regularly. We have provided all types of questions like MCQs, short answer questions, objective questions and long answer questions in the Class 10 Science practice sheet in Pdf. All questions have been designed for Science by looking into the pattern of problems asked in previous year examinations. You can download all Revision notes for Class 10 Science also absolutely free of cost. Lot of MCQ questions for Class 10 Science have also been given in the worksheets and assignments for regular use. All study material for Class 10 Science students have been given on studiestoday. We have also provided lot of Worksheets for Class 10 Science which you can use to further make your self stronger in Science.

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