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Test: Acids, Bases And Salts - 4


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25 Questions MCQ Test NCERT Textbooks (Class 6 to Class 12) | Test: Acids, Bases And Salts - 4

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Test: Acids, Bases And Salts - 4 - Question 1

The basic nature of sodium Hydroxide (NaOH) is due to the presence of which one of the following ions in solution

Detailed Solution for Test: Acids, Bases And Salts - 4 - Question 1

Hydroxide is a diatomic anion with chemical formula OH. NaOH dissociates into OH- ions in water which confirms its basic nature.

Test: Acids, Bases And Salts - 4 - Question 2

You are provided with a sample and a strip of red litmus paper. How would you confirm the nature of the sample?

Detailed Solution for Test: Acids, Bases And Salts - 4 - Question 2

As here only red litmus is given therefore it could not indicate the acidic solution therefore it is first dipped in Dil solution of NaOH so that it may turn blue and after that we pour drops of soln if the soln is acidic it would turn blue litmus to red and if it is basic it could remain in same colour and if it is neutral it colour changes to slightly yellowish.

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

A bud of petunias become reddish purple after first shower of rain because

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

The above mentioned situation shows that the first shower of rain water is acidic in nature. The acid present in rain water turns petunia bud reddish purple in colour. Primarily the rain water becomes acidic due to the presence of sulfuric acid and nitric acid which is derived by the reactions of several compounds like sulfur dioxide, oxides of nitrogen etc. present in air with rain water.

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

Which of the following is used in the refining of petroleum to remove sulphur and other compounds

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

Sulfuric acid on treating results in partial or complete removal of unsaturated hydrocarbons, sulfur, nitrogen, and oxygen compounds.

Test: Acids, Bases And Salts - 4 - Question 5

Statement A : HCl doesn’t show acidic properties in organic solvent. 
Statement B : HCl shows acidic properties in aqueous solution.
Which of the statement is true?

Detailed Solution for Test: Acids, Bases And Salts - 4 - Question 5

HCl  show acidic behaviour in aqueous solution as they dissosciate in water to produce Hydrogen ions while organic solvents do not form ions in water.

Test: Acids, Bases And Salts - 4 - Question 6

Find the incorrect statement

Detailed Solution for Test: Acids, Bases And Salts - 4 - Question 6

Normal, clean rain has a pH value of between 5.0 and 5.5, which is slightly acidic. However, when rain combines with sulfur dioxide or nitrogen oxides—produced from power plants and automobiles—the rain becomes much more acidic and ph becomes around 4.2 - 4.4

Test: Acids, Bases And Salts - 4 - Question 7

Bleaching powder is a

Detailed Solution for Test: Acids, Bases And Salts - 4 - Question 7

Bleaching powder has a pale yellow powder. It has a strong smell of chlorine. It is soluble in water but a clear solution is never formed due to the presence of impurities.

Test: Acids, Bases And Salts - 4 - Question 8

CaOCl2 is chemically

Detailed Solution for Test: Acids, Bases And Salts - 4 - Question 8

CaOCl2 is called as bleaching powder or calcium hypochlorite chloride i.e Ca(OCl) Cl.

Test: Acids, Bases And Salts - 4 - Question 9

Four solution P, Q, R, S have pH 2, 7, 9, 13 respectively. Which of the above solution will turn phenolphthalein pink?

Detailed Solution for Test: Acids, Bases And Salts - 4 - Question 9

Solution S and R will turn phenolphthalein pink because they are basic in nature and we know that bases turn phenolphthalein pink.

Test: Acids, Bases And Salts - 4 - Question 10

Statement A : salt formed when an acid reacts with metal is different than the salt formed when a base reacts with metal.
Statement B : Acetic acid is a weak acid but ammonia is a strong base.

Detailed Solution for Test: Acids, Bases And Salts - 4 - Question 10

Statement A is true, because  both salts are different. In statement B, acetic acid is a weak acid but ammonia is a weak base not a strong base .  So , statement second is false.

Test: Acids, Bases And Salts - 4 - Question 11

10ml of a solution of NaOH is found to be completely neutralized by 8ml of a given solution of HCl. If we take 20ml of the same solution of NaOH, the amount of HCl solution required to neutralize if will be

Detailed Solution for Test: Acids, Bases And Salts - 4 - Question 11

10 ml of NaOH requires 8 ml of HCl for neutralization
20 ml of NaOH will require (8/10)×20 = 16 ml of HCl

Test: Acids, Bases And Salts - 4 - Question 12

Ayush and Ishoo were given one-one test tube, one of the test tube containing water and the other containing a solution of sodium hydroxide. They were asked to identify the test tube containing NaOH solution. Which one of the following can be used for correctly identifying the test tube containing the solution of NaOH?

Detailed Solution for Test: Acids, Bases And Salts - 4 - Question 12

Red litmus has no action in water and turns blue in base.

Test: Acids, Bases And Salts - 4 - Question 13

On reacting HCl with granulated zinc, the following observation is made

Detailed Solution for Test: Acids, Bases And Salts - 4 - Question 13

Zinc reacts with dilute HCl to form zinc chloride and hydrogen gas is evolved. Hydrogen gas is colourless and odourless gas. To identify its presence a burning match stick is brought close to it and it burns with a pop sound.

  ​Zn + 2HCl = ZnCl2 + H2

Test: Acids, Bases And Salts - 4 - Question 14

Zinc metal is amphoteric in nature because

Detailed Solution for Test: Acids, Bases And Salts - 4 - Question 14

ZnO reacts with hydrochloric acid forming zinc chloride and water. With sodium hydroxide, it forms sodium zincate and water.Zno is an amphoteric oxide,because it can react with both acids and bases.

Test: Acids, Bases And Salts - 4 - Question 15

Which of the following does not form an acidic salt?

Detailed Solution for Test: Acids, Bases And Salts - 4 - Question 15

Carbonic acid as it is a weak acid. strong acids make acidic salts with weak bases and neutral salts with strong bases while weak acids make basic salts with strong bases and neutral with weak bases.

Test: Acids, Bases And Salts - 4 - Question 16

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 - 4 - Question 16

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 - 4 - Question 17

Honey bee sting has-

Detailed Solution for Test: Acids, Bases And Salts - 4 - Question 17

The venom of a honey bee contains formic acid

Test: Acids, Bases And Salts - 4 - Question 18

Curd and other sour substances should not be kept in metallic container because

Detailed Solution for Test: Acids, Bases And Salts - 4 - Question 18

Metals react with acids to form salts and hydrogen gas. When curd and other sour substances are kept in a copper vessel (metal), copper reacts with the acid in it to form hydrogen gas and toxic substances which are unhealthy and unfit for human consumption. It may cause food poisoning also.

Test: Acids, Bases And Salts - 4 - Question 19

On passing excess of CO2 gas in an aqueous solution of calcium carbonate, milkiness of the solution

Detailed Solution for Test: Acids, Bases And Salts - 4 - Question 19

On passing excess co2 through caco3 (aq).the milkiness of the solution fades because of the formation of ca (hco3)2 calcium bicarbonate which is soluble in water and hence the milkiness of the solution fades away.

Test: Acids, Bases And Salts - 4 - Question 20

Electrolysis of brine solution produces chlorine gas and hydrogen gas at

Detailed Solution for Test: Acids, Bases And Salts - 4 - Question 20

Anion Cl- is collected at anode and H+ cation is collected at cathode. Trick to remember: anion at anode and cation at cathode.

Test: Acids, Bases And Salts - 4 - Question 21

A gas produced in the lab is highly soluble in water. Its colorless solution turns pink when a few drops of phenolphthalein is added to it. What is the nature of the gas

Detailed Solution for Test: Acids, Bases And Salts - 4 - Question 21

The gas produced in lab is a base because when few drops of phenolphthalein is added to the gas it changes it's colour to pink and phenolphthalein only changes it's colour in basic solution .

Test: Acids, Bases And Salts - 4 - Question 22

Statement A : Sulphuric acid is diprotic acid and phosphoric acid is triprotic acid.
Statement B : chlor – alkali process is involved in the manufacturing of bleaching powder

Detailed Solution for Test: Acids, Bases And Salts - 4 - Question 22

Sulphuric acid is an example of diprotic acid. A diprotic acid is an acid that can donate two proton or hydrogen atom per molecule to an aqueous solution. 
Phosphoric acid is a Triprotic acid. They can donate three proton. 

Test: Acids, Bases And Salts - 4 - Question 23

Water contains more H+ ions than OH- ions. In this case, water is

Detailed Solution for Test: Acids, Bases And Salts - 4 - Question 23

If the water contains more H+ ions, it will become more acidic. If water contains more OH- ions, it will become more basic.

Test: Acids, Bases And Salts - 4 - Question 24

The pH of solution A is 6 and pH of solution B is 8. Which solution has more hydrogen ion concentration?

Detailed Solution for Test: Acids, Bases And Salts - 4 - Question 24

A pH value of less than 7 indicates an acidic solution, while greater than 7 indicates a basic solution. Therefore, the solution with pH = 6 is acidic and has more hydrogen ion concentration than the solution of pH = 8 which is basic.

Test: Acids, Bases And Salts - 4 - Question 25

Match the following with correct response.

 

Detailed Solution for Test: Acids, Bases And Salts - 4 - Question 25

Lemon contains citric acid. Vinegar has acetic acid. Nitric acid is also known as mineral acid. Tamarind has tartaric acid.

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