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Test: Introduction to Acids & Bases


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Test: Introduction to Acids & Bases - Question 1

The acid present in curd is:

Detailed Solution for Test: Introduction to Acids & Bases - Question 1

The acid present in curd is lactic acid. Curd forms due to the chemical reaction between lactic acid bacteria and milk protein casein. The increased acidity causes the milk proteins (casein) to tangle into solid masses or curds.

Test: Introduction to Acids & Bases - Question 2

Which of the following properties is NOT shown by bases?

Detailed Solution for Test: Introduction to Acids & Bases - Question 2

Blue litmus paper turns red under acidic conditions. It will turn red when it comes into contact with an acid. If it comes into contact with a substance that is basic or neutral, it will remain blue.

Test: Introduction to Acids & Bases - Question 3

Which of the following acid is a weak acid?

Detailed Solution for Test: Introduction to Acids & Bases - Question 3

Acids like acetic acid (CH3COOH) dissociate partially or incompletely, releasing only some of their hydrogen atoms into the solution. Hence it is a weak acid.

Test: Introduction to Acids & Bases - Question 4

The natural source of Acetic acid is:

Detailed Solution for Test: Introduction to Acids & Bases - Question 4

Option A: Lactic acid is found in curd
Option B: Citric acid is found in Oranges
Option C: Oxalic acid is found in tomatoes
Option D: Acetic acid is found in vinegar

Thus, option D is correct.

Test: Introduction to Acids & Bases - Question 5

Lime water is

Detailed Solution for Test: Introduction to Acids & Bases - Question 5

Limewater is the common name for a dilute aqueous solution of calcium hydroxide.
Calcium hydroxide, Ca(OH)2, is sparsely soluble at room temperature in water (1.5 g/L at 25 °C). It is basic in nature with a pH of 12.4.

Test: Introduction to Acids & Bases - Question 6

Which of the following is a strong base?

Detailed Solution for Test: Introduction to Acids & Bases - Question 6

KOH (aq), or Potassium Hydroxide, is a strong base. When added to water, it dissociates completely to give mobile ions, including the hydroxide ion which is responsible for the alkaline properties of the substance.

Test: Introduction to Acids & Bases - Question 7

The difference of molecules of water in gypsum and PoP is

Detailed Solution for Test: Introduction to Acids & Bases - Question 7

Gypsum: CaSO44.2H​2O
Plaster of paris: CaSO4​.0.5H2​O.

The difference in number of water molecules is = 2 - 0.5 = 1.5 = 3/2

Test: Introduction to Acids & Bases - Question 8

Which of the following is NOT an organic acid?

Detailed Solution for Test: Introduction to Acids & Bases - Question 8

Sulfuric acid is inorganic because it doesn't contain carbon atoms bonded to oxygen, nitrogen and hydrogen atoms. 

Test: Introduction to Acids & Bases - Question 9

Which one of the following is acidic/slightly acidic?

Detailed Solution for Test: Introduction to Acids & Bases - Question 9

Option A: Lemon juice in its natural state is acidic with a pH of about 2, but once metabolized it actually becomes alkaline with a pH well above 7. So, outside the body, anyone can see that lemon juice is very acidic.

Option B: Tomatoes are on the low end of acidic foods. An alkaline diet is not that you can not have any foods that are acidic but a balance of both alkaline and acidic.

Option C: Milk is actually pretty close to neutral with a pH of 6.8 (slightly acidic). It can become acidic if bacteria break down the milk sugar and produce lactic acid. This is what causes milk to sour.

Thus, option D is correct.

Test: Introduction to Acids & Bases - Question 10

Which of the following acid is present in tamarind?

Detailed Solution for Test: Introduction to Acids & Bases - Question 10

The acid that is present in tamarind is tartaric acid, which is a white crystalline organic acid.

Test: Introduction to Acids & Bases - Question 11

We should never add water to acid because:

Detailed Solution for Test: Introduction to Acids & Bases - Question 11

If we add water to acid, the reaction would become highly exothermic and lots of heat would be generated which would splash​ on your face and cause severe burns.

Test: Introduction to Acids & Bases - Question 12

Which of the following properties is not shown by acids ?

Detailed Solution for Test: Introduction to Acids & Bases - Question 12

Acids dissociate in water to give H+ ions and not OH-. OH- ions are released on dissociation of bases in water.

Test: Introduction to Acids & Bases - Question 13

Acids when dissolved in water produce:

Detailed Solution for Test: Introduction to Acids & Bases - Question 13

Most acids release H+ ions in water, which combines with water molecules to produce hydronium (H3O+) ions.
Example: HCl(g) + H2O(l) → Cl(aq) + H3O+(aq)

Test: Introduction to Acids & Bases - Question 14

A substance ‘A’ does not dissociate completely into its ions in aqueous solutions. It is bitter in taste and soapy to touch.Identify the substance A.

Detailed Solution for Test: Introduction to Acids & Bases - Question 14

A base is bitter in taste and soapy to touch. A weak base does not dissociate completely into its ions in aqueous solutions.

Test: Introduction to Acids & Bases - Question 15

Select the substance which shows acidic behavior in its aqueous solution.​

Detailed Solution for Test: Introduction to Acids & Bases - Question 15

Acid is defined as the substance which dissociates and releases H+ ions in their aqueous states.
HCl (aq.) gives H+ (aq.) in aqueous solution.
But molecules like alcohol, glucose, and Urea do not produce H+ ions and thus are not considered acids.

Test: Introduction to Acids & Bases - Question 16

Find the odd one out:

Detailed Solution for Test: Introduction to Acids & Bases - Question 16

CuSO4.5H2O is a hydrated salt. An example of acid salt is NaHCO3.

Test: Introduction to Acids & Bases - Question 17

Which one will NOT change red litmus to blue?

Detailed Solution for Test: Introduction to Acids & Bases - Question 17

HCL is an acid so it won't have any effect on red litmus paper

Test: Introduction to Acids & Bases - Question 18

Select the one which is WRONGLY mapped

Detailed Solution for Test: Introduction to Acids & Bases - Question 18

Calcium Hydroxide (not carbonate) is commonly referred to as slaked lime.

Test: Introduction to Acids & Bases - Question 19

Name an element which is common to all acids?

Detailed Solution for Test: Introduction to Acids & Bases - Question 19

An element which is common to all acids is Hydrogen because acids dissociate into H+ ions.

Test: Introduction to Acids & Bases - Question 20

Name an acid which contains both oxygen and hydrogen?

Detailed Solution for Test: Introduction to Acids & Bases - Question 20

An oxyacid is an acid that contains an oxygen atom bonded to a hydrogen atom and at least one other element.
General structure: X-O-H

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