CBSE X Science Acids & Base - EducareHut (Next Gen Knowledge Point)

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#1. Phenolphthalein exhibits which color with an acid?

Red

Pink

Green

Remains colorless

#2. Sodium chloride, sodium sulphate, sodium carbonate are examples of salt. These salts belong to which of the following family of salts?

Sodium family

Salt family

Hydrochloric acid family

Acidic salt family

#3. Which of the following compound is formed when zinc reacts with hydrochloric acid?

Zinc chloride

Zinc carbonate

Zinc hydroxide

Zinc sulphate

#4. Which of the following substance will not give carbon dioxide on treatment with dilute acid?

Baking soda

Marble

Lime

Limestone

#5. What happens when hydrogen carbonate reacts with an acid?

Carbon dioxide gas

Carbonic acid gas

Carbon monoxide

Hydrochloric acid gas

#6. To protect tooth decay we are advised to brush our teeth regularly. The nature of the tooth paste commonly used is

neutral

basic

acidic

corrosive

Explanation: Tooth paste contains mild base which neutralizes acid produced by bacteria present in mouth. This prevents corrosion of tooth enamel.

#7. What happens when carbon dioxide gas reacts with sodium hydroxide?

Sodium carbonate is formed

Carbon dioxide is formed

Carbon monoxide is formed

Carbon dioxide does not react with sodium hydroxide

#8. Which acid is found in curd?

Lactic acid

Tartaric acid

Sulphuric acid

Citric acid

#9. What is the taste of a base?

Salty

Sweet

Sour

Bitter

Explanation: All base taste bitter.

#10. What is the color of hydrated copper sulphate?

White grey

Blue

Red grey

Greenish

#11. Which of the following is known as soda ash?

Sodium carbonate

Calcium carbonate

Sodium carbonate decahydrate

Sodium bicarbonate

#12. Rubbing of which does give relief from pain in the case of bee sting?

Dilute hydrochloric acid

Alkali

Dilute nitric acid

Tooth paste

Explanation: Toothpaste contains mild base, which neutralize the acid injected with bee sting. Alkali is a corrosive base. Applying alkali will prove dangerous to skin.

#13. Which one of the following can be used as an acid and base indicator by a visually impared student?

Litmus

Petunia leaves

Vanilla essence

Turmeric

Explanation: Vanilla is an olfactory indicator, which vanishes its smell with base. Thus, it is used by a visually impared student.

#14. Identify the correct representation of reaction occurring during chloralkali process

2NaCl(aq) + 2H2O(l) → 2NaOH(aq) + Cl2 (aq) + H2 (aq)

2NaCl(aq) + 2H2O(aq) → 2NaOH(aq) + Cl2 (g) + H2 (g)

2NaCl (aq) + 2H2O (l) → 2NaOH (aq) + Cl2 (g) + H2 (g)

2NaCl(l) + 2H2O(l) → 2NaOH(l) + Cl2 (g) + H2 (g)

#15. Which of the following statements 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

(i) and (iii)

(ii) and (iii)

(ii) and (iv)

(i) and (iv)

Explanation: Strength of acid increases with decrease in value of pH from 7 while strength of base increases with increase in value of pH from 7.

#16. What is the pH value of sodium chloride?

Zero

7 (seven)

Less than 7 (seven)

More than 7 (seven)

#17. Match the chemical substances given in Column (A) with their appropriate application given in Column B of Fig

A–(ii), B–(i), C–(iv), D–(iii)

A–(ii), B–(iv), C–(i), D–(iii)

A–(iii), B–(iv), C–(i), D–(ii)

A–(iii), B–(ii), C–(iv), D–(i)

#18. What happens when soap is applied on a cloth having turmeric stain?

Color of stain changes to blue

No effect seen on color of stain

Color of stain changes to greenish black

Color of stain changes to brown red

#19. what happens when a moist blue litmus paper is brought near the hydrochloric acid gas?

Litmus paper turns red

No change in the colour of litmus paper

Colour of litmus paper vanishes out

Litmus paper turns green

Explanation: It is necessary to moist the litmus paper to detect the acidic gas. Dry litmus paper does not change the colour when brought near the hydrochloric acid gas. An acid does not dissociate hydrogen ions without water.

#20. Which one of the following types of medicines is used for treating indigestion?

Antiseptic

Antacid

Antibiotic

Analgesic

Explanation: Because of over eating our stomach produce more acid, which is generally resulting in indigestion. Thus, to neutralize excess acid produced by stomach antacid is taken as medicine. Thus answer is (c) Antacid

#21. Which of the following salt was prepared by Mahatma Gandhi while Dandi March?

Copper chloride

Potassium chloride

Calcium chloride

Sodium chloride

#22. What is the color of anhydrous copper sulphate?

White grey

Blue grey

Greenish

Blue

#23. Equal volumes of hydrochloric acid and sodium hydroxide solutions of same concentration are mixed and the pH of the resulting solution is checked with a pH paper. What would be the colour obtained? (You may use colour guide given in Figure

Blue

Red

Yellowish green

Yellow

Explanation: Hydrochloric acid and sodium hydroxide neutralizes each other and pH of the resulting solution will be 7. Thus, option (c) Yellowish green is the correct answer

#24. What is the original color of phenolphthalein solution which is an indicator?

Red

Pink

Violet

Colorless

#25. Which of the following acid is also known as vinegar?

Dilute sulphuric acid

Dilute tartaric acid

Dilute acetic acid

Dilute hydrochloric acid

#26. A solution reacts with crushed egg-shells to give a gas that turns lime-water milky. The solution contains

KCl

NaCl

HCL

LiCl

Explanation: egg shells are made of calcium carbonate. When calcium carbonate reacts with hydrochloric acid, it produces carbon dioxide gas. When this carbon dioxide gas is passed through lime water, lime water turns milky.

Thus, here answer is (b) HCl

#27. Which of the following is common in all bases?

Chloride ions

Sodium ions

Hydroxide ions

Hydrogen ions

#28. Which of the following is common in all acids?

Hydroxide ions

Chloride ions

Sodium ions

Hydrogen ions

#29. What is the nature of metal oxide?

Basic

Acidic

Neutral

None of the Answer

#30. If the pH value of a solution is 6, then solution will be of what type?

Mild acid

Mild base

Strong base

Strong acid

#31. In an attempt to demonstrate electrical conductivity through an electrolyte, the following apparatus (Figure) was set up. Which among the following statement(s) is(are) correct? i. Bulb will not glow because electrolyte is not acidic ii. Bulb will glow because NaOH is a strong base and furnishes ions for conduction. iii. Bulb will not glow because circuit is incomplete iv. Bulb will not glow because it depends upon the type of electrolytic solution

(iv) only

(ii) only

(ii) and (iv)

(i) and (iii)

#32. What happens when an acid react with base?

A salt is formed

Water is formed

All of the Answers

Acid neutralizes base

#33. Which of the following acid is produced in our stomach?

Dilute nitric acid

Acetic acid

Sulphuric acid

Hydrochloric acid

#34. Which of the following statements is true for acids?

Bitter and change blue litmus to red

Bitter and change red litmus to blue

Sour and change blue litmus to red

Sour and change red litmus to blue

#35. Which of the following compound is formed when zinc reacts with sodium hydroxide?

Zinc hydrogenate

Sodium zincate

No reaction takes place

Zinc hydroxide

#36. Which statement is correct?

Bee sting contains formic sting

Inorganic acids are prepared in laboratory

Organic acids are obtain from natural sources

All of the Answers

#37. What happens when carbon dioxide gas reacts with water?

Carbonic acid is formed

No reaction takes place

Carbon monoxide gas is formed

Oxygen gas is formed

#38. A sample of soil is mixed with water and allowed to settle. The clear supernatant solution turns the pH paper yellowish-orange. Which of the following would change the colour of this pH paper to greenish-blue?

An antacid

Vinegar

Common salt

Lemon juice

Explanation: Yellowish orange color of pH paper shows the pH value is about 2 to 3. This means soil is highly acidic. And greenish blue color of pH paper shows the pH value is about between 4 and 5.

Thus, to neutralize this acid upto some extent, i.e. to increase pH value near between 4 to 5, an antacid is needed.

Thus, answer is (d) An antacid

#39. Which of the following gives the correct increasing order of acidic strength?

Water < Hydrochloric acid < Acetic acid

Acetic acid < Water < Hydrochloric acidtic acid

Water < Acetic acid < Hydrochloric acid

Hydrochloric acid < Water < Acetic acid

Answer: (a) Water < Acetic acid < Hydrochloric acid

Explanation: pH value of water is about 7. Acetic acid is a weaker acid while hydrochloric acid is a strong acid.

Thus, the correct increasing order of acidic strength is (a) Water < Acetic acid < Hydrochloric acid

#40. Which acid is found in bee sting?

Formic acid

Citric acid

Tartaric acid

Nitric acid

Finish