10.2 Acid Bases and Salts

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Your Name (in BLOCK letters) *

If you are Student from any Kendriya Vidyalaya write the name of your Region in capital letters, else write NA *

1. Following are some statements on acids and bases. Find the incorrect statement. *

2 points

Acids are sour to taste

Acids changes red litmus to blue

bases are bitter tasting

acids have pH less than 7

2. Which of the following are natural indicators? *

2 points

Litmus and Methyl orange

Methyl orange and Litmus

Phenolphthalein and Methyl orange

Litmus and Turmeric

3. Which of the following statements is incorrect for Acids *

2 points

Acids give Hydrogen ions in aqueous solution

Acid is a substance which donates a proton

They can donate a pair of electrons

They are sour in taste

4. Which statement is true for a base? *

2 points

Sweet taste

Releases Hydrogen ion in aqueous medium

accepts a proton and can donate a pair of electrons

pH is below 7

5. Different acids can act on indicators in different ways. Which of the following statement is incorrect? *

2 points

Acids change blue litmus to red

Acids can change colour of methyl orange to red

Phenolphthalein is red colour in an acidic medium

Acids do not affect red litmus

6. Find the incorrect statement about Olfactory indicators *

2 points

These are materials which changes its smell with change in nature of solutions

smell of Onion extract is not detectable in basic solutions

Smell of Vanilla extract is not detectable in basic solutions

Smell of Clove oil is detectable in basic solutions

7. Test tube A contains Hydrochloric acid while Test tube B contains Sodium hydroxide. In both the tubes small amount of onion extract is poured. What will you observe? *

2 points

Smell id detected in A

Smell is detected in B

Smell is detected in both A and B

Smell is not detected in both A and B

8. When acids react with metals e.g Reaction of Sulphuric acid(aq) with Zinc(s). Find the incorrect statement *

2 points

Hydrogen gas is liberated

Corresponding salt is formed

This can be called Displacement Reaction

proves that Acids have non displaceable Hydrogen

9. The teacher was demonstrating in the class an experiment showing that the same metal reacts with different speeds with different acids. So 4 test tubes containing dilute acids were marked A (Hydrochloric acid), B (Sulphuric acid), C ( Phosphoric acid) and D (Acetic acid). Equal number of Zinc granules were placed in each tube and evolution of Hydrogen was observed. Comment on the speed of reactions in decreasing order. *

2 points

A - B -C -D

A - C - B - D

B - A - C - D

D - C - B - A

10. When acid is poured in water , which one does not occur? *

2 points

homogenous solution is produced

An exothermic reaction occurs

solution becomes hot

precipitation occurs

11. From the list of acids find out the strong acid *

2 points

Phosphoric acid

Hydrochloric acid

Acetic acid

Oxalic acid

12. Which pair of acids are weak? *

2 points

Formic acid and Hydrochloric acid

Acetic acid and Nitric acid

Formic acid and Acetic acid

Hydrochloric acid and Nitric acid

13. Out of the following bases which ones are strong bases?A- Sodium Hydroxide B- Ammonium Hydroxide C- Potassium Hydroxide D- Magnesium Hydroxide *

2 points

A and B

A and C

A and D

B and C

14. Read the statements on Alkali given below. Find the incorrect statement. *

2 points

Alkali is a water soluble base

In aqueous solution alkali gives hydroxide (OH-) ion

NaOH can exist in solid form also

Every base is an alkali but all alkali need not be a base

15. Here are some alkali with their common names. Find the correct match *

2 points

Sodium Hydroxide - Caustic potash

Potassium Hydroxide - Slaked lime

Calcium Hydroxide - Caustic soda

None of the above is correct match

16. Let us study the action of water soluble bases on different indicators. Which of the following observation is incorrect? *

2 points

bases do not affect blue litmus

solution turns pink with phenolphthalein solution

yellow colour of turmeric turns brown with alkali

bases change the colour of methyl orange to blue

17. From the following statements find the one which is not correct for pH scale. *

2 points

pH is the power of hydrogen ions in solutions

pH scale ranges to 1 to 14

pH 7 is neutral

Below 7 is acidic

Above 7 is basic

18. Solution A has pH value 6 while solution B has pH 8. Now read the statements to find out the incorrect interpretation. *

2 points

Solution A is acidic

Solution A has less hydrogen ions than solution B

solution B is basic

Solution B has less hydrogen ions than A

19. Let us study conversion of milk to curd. What will not happen ? *

2 points

the change will be called souring of milk

More lactic acid is formed

Hydrogen ions will increase

pH will increase

20. Following are some acid and their natural sources. Identify the incorrect pair. *

2 points

Acetic acid- vinegar

lactic acid - curd

Oxalic acid - Tomato

Tartaric acid - Orange

What was the difficulty level of this test? *

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Quite easy

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