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Test: Acids, Bases And Salts - 3


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25 Questions MCQ Test NCERT Textbooks (Class 6 to Class 12) | Test: Acids, Bases And Salts - 3

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Test: Acids, Bases And Salts - 3 - Question 1

A solution turns red litmus blue, its pH is likely to be –

Detailed Solution for Test: Acids, Bases And Salts - 3 - Question 1

The solution which turns red litmus blue is basic. Its pH should be greater than 7. Therefore, the correct answer is (d).

Test: Acids, Bases And Salts - 3 - Question 2

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

Detailed Solution for Test: Acids, Bases And Salts - 3 - Question 2

The solution is HCl.
Egg shells contains calcium carbonate, which on reaction with HCl liberates CO2 gas which turn lime water to milky.
CaCO3 + 2HCl → CaCl2 + H2O + CO2

Test: Acids, Bases And Salts - 3 - Question 3

10 ml of a solution of NaOH is found to be completely neutralised by 8mL of a given solution of HCl. If we take 20 mL of the same solution of NaOH, the amount HCl solution (the same solution as before) required to neutralise it will be–

Detailed Solution for Test: Acids, Bases And Salts - 3 - Question 3

Since 10 mL of NaOH solution requires 8 mL of HCl solution

Therefore, 20 mL of NaOH solution will require 8 x 2 = 16 mL of HCl solution

Test: Acids, Bases And Salts - 3 - Question 4

Which one of the following types of medicines is used for treatment indigestion–

Detailed Solution for Test: Acids, Bases And Salts - 3 - Question 4

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

Test: Acids, Bases And Salts - 3 - Question 5

According to Arrhenius acid gives –

Detailed Solution for Test: Acids, Bases And Salts - 3 - Question 5

According to Arrhenius, an acid. Is a substance which dissociates into H+ ion in water.

Test: Acids, Bases And Salts - 3 - Question 6

Milk of magnesia is an –

Detailed Solution for Test: Acids, Bases And Salts - 3 - Question 6

Milk of Magnesia is a brand name for magnesium hydroxide, a medication used to treat constipation. Milk of Magnesia can also be used as an antacid. It can help relieve heartburn, sour stomach, and acid indigestion.

Test: Acids, Bases And Salts - 3 - Question 7

Noble metals are dissolved in –

Detailed Solution for Test: Acids, Bases And Salts - 3 - Question 7

Aqua regia is a highly corrosive mixture of hydrochloric acid (HCl) and nitric acid (HNO3) in a molar ratio of 3:1 or 4:1. The name “aqua regia” translates from Latin to mean “king’s water” or “royal water,” referring to the acid’s ability to dissolve the noble metals gold, platinum, and palladium.

Test: Acids, Bases And Salts - 3 - Question 8

Which of the following is not a strong acid?

Detailed Solution for Test: Acids, Bases And Salts - 3 - Question 8

Ch3COOH is weak acid as it dissociates only slightly in water.

Test: Acids, Bases And Salts - 3 - Question 9

Soda ash is –

Detailed Solution for Test: Acids, Bases And Salts - 3 - Question 9

Soda ash, also known as sodium carbonate (Na2CO3), is an alkali chemical compound

Test: Acids, Bases And Salts - 3 - Question 10

Which of the following is an basic salt?

Detailed Solution for Test: Acids, Bases And Salts - 3 - Question 10

Salt of weak acid and strong base: CH3COONa is a salt of weak acid CH3COOH and strong base NaOH. When it is dissolved in water it dissociates completely. ions of water get trapped and the pH of solution increases.

Test: Acids, Bases And Salts - 3 - Question 11

Which of the following method is not used in preparing a base?

Detailed Solution for Test: Acids, Bases And Salts - 3 - Question 11

The reaction between acid and base
It is a neutralization reaction which forms a salt but the base is not formed.

Test: Acids, Bases And Salts - 3 - Question 12

Fats + NaOH→ ........+ Glycerol. One of the product formed in this reacton is –

Detailed Solution for Test: Acids, Bases And Salts - 3 - Question 12

Soaps are sodium or potassium salts of long chain fatty acids. When triglycerides in fat/oil react with aqueous NaOH or KOH, they are converted into soap and glycerol. This is called alkaline hydrolysis of esters. 

Test: Acids, Bases And Salts - 3 - Question 13

Potash alum is a ?

Detailed Solution for Test: Acids, Bases And Salts - 3 - Question 13

Potash alum is used in the purification of water. Potash alum, K2SO4, AI2(SO4) 3, 24H2O, is an example of a double salt.

Test: Acids, Bases And Salts - 3 - Question 14

NaHCO3 represent the formula of which one of the following?

Detailed Solution for Test: Acids, Bases And Salts - 3 - Question 14

The chemical name of NaHCO3 is sodium bicarbonate. This ionic compound is a common household product, otherwise known as baking soda. 

Test: Acids, Bases And Salts - 3 - Question 15

Which of the following salts contains water of crystallization.
I. Gypsum
II. Epsum salt
III. Blue vitriol
IV. Glauber’s salt

Detailed Solution for Test: Acids, Bases And Salts - 3 - Question 15

Blue vitriol is copper sulphate Pentahydrate 
CuSO4. 5H2O . It has 5 moles of water. 
Gypsum is calcium sulphate dihydrate 
CaSO4. 2H2O . It has two moles of water.
The chemical formula of Epsom salt is magnesium sulfate  MgSO4(H2O) x, where x varies from 0 to 7.Glauber's salt is the Decahydrate form of sodium sulfate.  NaSO4. 10H2O.

Test: Acids, Bases And Salts - 3 - Question 16

What is the colour of phenolphthalein in soap solution?

Detailed Solution for Test: Acids, Bases And Salts - 3 - Question 16

Since soap solution is basic, phenolphthalein turns pink in pink solution.

Test: Acids, Bases And Salts - 3 - Question 17

Which one of the following types of medicines is used for treating acidity?

Detailed Solution for Test: Acids, Bases And Salts - 3 - Question 17

The indigestion is due to excess of acid produced in the stomach. The medicine used to neutralise it is called antacid 

Test: Acids, Bases And Salts - 3 - Question 18

Which of the following salts has no water of crystallization?

Detailed Solution for Test: Acids, Bases And Salts - 3 - Question 18

The baking soda i.e, NaHCO3 does not contain water of crystallization.

Test: Acids, Bases And Salts - 3 - Question 19

Lime water is

Detailed Solution for Test: Acids, Bases And Salts - 3 - Question 19

Calcium hydroxide (traditionally called slaked lime) is an inorganic compound with the chemical formula Ca(OH)2

Test: Acids, Bases And Salts - 3 - Question 20

What is the nature of non metallic oxide

Detailed Solution for Test: Acids, Bases And Salts - 3 - Question 20

Non-metals react with oxygen in the air to produce non-metal oxides.

 Nature of non metallic oxide is  acidic in nature , unlike of metallic oxides which are found to be basic in nature.

Test: Acids, Bases And Salts - 3 - Question 21

“Alcohols and glucose contain hydrogen but are not treated as acids”

Detailed Solution for Test: Acids, Bases And Salts - 3 - Question 21

When acid is dissolved in water, it dissociates into ions and thus it conducts electricity due to presence of ions. But alcohol and glucose being very weak acid do not dissociate into ions and thus, do not conduct electricity.

Test: Acids, Bases And Salts - 3 - Question 22

Lemon contains

Detailed Solution for Test: Acids, Bases And Salts - 3 - Question 22

 The main organic acids contained in the flesh of lemons are citric acid and malic acid. The sourness of citrus fruit is the taste of citric acid.

Test: Acids, Bases And Salts - 3 - Question 23

Name an indicator which indicates the various levels of hydrogen ion concentration

Detailed Solution for Test: Acids, Bases And Salts - 3 - Question 23

PH paper indicates the various levels of hydrogen ion concentration.

Test: Acids, Bases And Salts - 3 - Question 24

When conc acid is added to H2O, the reaction is

Detailed Solution for Test: Acids, Bases And Salts - 3 - Question 24

When concentrated acid is added to water, the strong bonds of acid are broken and they dissociate into ions, thus releasing a large amount of energy in the form of heat.
Thus, the reaction is exothermic.

Test: Acids, Bases And Salts - 3 - Question 25

Which gas is liberated when HCl is added to a sample of solid Na2CO3 ?

Detailed Solution for Test: Acids, Bases And Salts - 3 - Question 25

On heating it forms sodium carbonate (Na2CO3), B and CO2 gas, C is evolved. When CO2 gas is passed through lime water it forms calcium carbonate (CaCO3), which is slightly soluble in water making it milky.

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