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Science Olympiad Test: Acids, Bases and Salts- 2 - Class 10 MCQ


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15 Questions MCQ Test Olympiad Preparation for Class 10 - Science Olympiad Test: Acids, Bases and Salts- 2

Science Olympiad Test: Acids, Bases and Salts- 2 for Class 10 2024 is part of Olympiad Preparation for Class 10 preparation. The Science Olympiad Test: Acids, Bases and Salts- 2 questions and answers have been prepared according to the Class 10 exam syllabus.The Science Olympiad Test: Acids, Bases and Salts- 2 MCQs are made for Class 10 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Science Olympiad Test: Acids, Bases and Salts- 2 below.
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Science Olympiad Test: Acids, Bases and Salts- 2 - Question 1

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

Detailed Solution for Science Olympiad Test: Acids, Bases and Salts- 2 - Question 1

Turning of the pH paper yellowish – orange shows that the solution is acidic (pH ≈ 5) . To change it to greens blue means we want to change it to basic (pH ≈ 8) This can be done by adding an antacid [like Mg(OH)2)]

Science Olympiad Test: Acids, Bases and Salts- 2 - Question 2

What happens when a solution of an acid is mixed with a solution of a base in a test tube?
(i) The temperature of the solution increases
(ii) The temperature of the solution decreases
(iii) The temperature of the solution remains the same
(iv) Salt formation takes place

Detailed Solution for Science Olympiad Test: Acids, Bases and Salts- 2 - Question 2

Mixing of solution of an acid with the solution of base (neutralization) is exothermic i.e. temperature increase and salt formation takes place.

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Science Olympiad Test: Acids, Bases and Salts- 2 - Question 3

Glauber’s salt is

Detailed Solution for Science Olympiad Test: Acids, Bases and Salts- 2 - Question 3

Glauber’s salt is sodium sulphate decahydrate Na2SO4.10H2O

Science Olympiad Test: Acids, Bases and Salts- 2 - Question 4

The water of crystallization of green vitriol is

Detailed Solution for Science Olympiad Test: Acids, Bases and Salts- 2 - Question 4

Green vitriol or ferrous sulphate is FeSO4.7H2O

Science Olympiad Test: Acids, Bases and Salts- 2 - Question 5

If a few drops of a concentrated acid accidentally spill over the hand of a student, what should be done?

Detailed Solution for Science Olympiad Test: Acids, Bases and Salts- 2 - Question 5
  • If a few drops of a concentrated acid accidentally spill over the hand of a student, wash the hand immediately with plenty of water and apply a paste of sodium hydrogen carbonate.
  • Water will dilute the acid and wash it out. Any remaining acid will be neutralized with sodium hydrogen carbonate. This will minimize the effect of acid and damage to the skin.
Science Olympiad Test: Acids, Bases and Salts- 2 - Question 6

Which of the following gives the correct increasing order of acid strength?

Detailed Solution for Science Olympiad Test: Acids, Bases and Salts- 2 - Question 6

HCl has the highest acidic strength as it is a strong acid and completely or 100% ionizes into its ions which is shown by its dissociation constant. Acetic acid partially dissociates into its ions and at equilibrium stage both the ions, acetae and hydrogen ions are present so it has less acidic strength than HCl. Water is the weakest of all and its ions hydrogen and hydroxide ions keeps on forming water molecule at the equilibrium stage.

Science Olympiad Test: Acids, Bases and Salts- 2 - Question 7

Calcium phosphate is present in tooth enamel. Its nature is

Detailed Solution for Science Olympiad Test: Acids, Bases and Salts- 2 - Question 7

Calcium phosphate is basic salt since it is a source of weak phosphoric acid and a slightly stronger base of calcium hydroxide. Calcium phosphate is a mineral comprising calcium ion (Ca2+) and phosphate ion which is inorganic in nature.  It is present in the crown area of the tooth and also in bones.

Science Olympiad Test: Acids, Bases and Salts- 2 - Question 8

Each volumes of solutions with pH = 4 and pH = 10 are mixed. What is the pH of the resulting solution?

Detailed Solution for Science Olympiad Test: Acids, Bases and Salts- 2 - Question 8

pH = 4 means [H+] = 10–4 M. pH = 10 means (H+) = 10–10 M or [H] = 10–4 M
Thus, one solution is acidic and the other is basic. Further, they have same molarity. On mxing equal volumes, then will neutralize each other completely. The resulting solution will be neutral with pH = 7.0

Science Olympiad Test: Acids, Bases and Salts- 2 - Question 9

Which among the following is not a base?

Detailed Solution for Science Olympiad Test: Acids, Bases and Salts- 2 - Question 9

C2H5OH is alcohol, not a base. An acid is any hydrogen-containing substance that is capable of donating a proton (hydrogen ion) to another substance.  A base is a molecule or ion able to accept a hydrogen ion from an acid.

Science Olympiad Test: Acids, Bases and Salts- 2 - Question 10

The acid used for washing eyes is

Detailed Solution for Science Olympiad Test: Acids, Bases and Salts- 2 - Question 10
  • The acid used in eye wash is boric acid.
  • Boric acid is a mild antiseptic, insecticide and its chemical formula is H3BO3.
  • It has antibiotic properties against bacterial infection.
  • It is used as a cleanser for the eyes.
Science Olympiad Test: Acids, Bases and Salts- 2 - Question 11

Which of the following are present in a dilute aqueous solution of hydrochloric acid?

Detailed Solution for Science Olympiad Test: Acids, Bases and Salts- 2 - Question 11

HCl + H2O → H3O+ + Cl
In the aqueous solution of HCl hydronium ions are formed along with chloride ions.

Science Olympiad Test: Acids, Bases and Salts- 2 - Question 12

A salt on treatment with excess of ammonium hydroxide produces a complex tetraammine copper (II) ions. The salt contains

Detailed Solution for Science Olympiad Test: Acids, Bases and Salts- 2 - Question 12

Cupric ions, as they react with excess of ammonia solution to form [Cu(NH3)4]2+

Science Olympiad Test: Acids, Bases and Salts- 2 - Question 13

When dilute hydrochloric acid is poured over powdered calcium carbonate, efflorescence are formed, it is because

Detailed Solution for Science Olympiad Test: Acids, Bases and Salts- 2 - Question 13

When dilute hydrochloric acid is poured over powdered calcium carbonate, efflorescence are formed, it is because carbon dioxide is evolved.

Science Olympiad Test: Acids, Bases and Salts- 2 - Question 14

What is pH of a solution whose hydrogen ion concentration is 1 × 10–3 M?

Detailed Solution for Science Olympiad Test: Acids, Bases and Salts- 2 - Question 14

pH = – log [H+]
pH = – log (1 × 10–3] = – (– 3) log10
pH = 3

Science Olympiad Test: Acids, Bases and Salts- 2 - Question 15

Which of the following substances will not give carbon dioxide on treatment with dilute acid?

Detailed Solution for Science Olympiad Test: Acids, Bases and Salts- 2 - Question 15

Marble, Limestone and baking soda have carbonates which produces COgas. Lime contains Hydroxide which will not produce CO2. Marble, limestone, and baking soda are all metal carbonates or bicarbonates. When they interact with a dilute acid, carbon dioxide is produced. When lime, which is calcium oxide, combines with a dilute acid carbon dioxide is not produced.
CaO + dil 2HCl → CaCl2 + H2O
Thus, lime when reacts with an acid then it produces salt and water but it does not produce carbon dioxide.

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