Acids Bases Salts VBQs Class 10 Science

VBQs Acids Bases Salts Class 10 Science with solutions has been provided below for standard students. We have provided chapter wise VBQ for Class 10 Science with solutions. The following Acids Bases Salts Class 10 Science value based questions with answers will come in your exams. Students should understand the concepts and learn the solved cased based VBQs provided below. This will help you to get better marks in class 10 examinations.

Acids Bases Salts VBQs Class 10 Science

Objective Questions

Question. An acid (A) with sodium hydrogen carbonate is used in making the cakes fluffy and spongy. It is due to the release of (B) gas in the reaction. Here, X and Y are
(a) A : Oxalic acid : B : CO₂
(b) A : Tartaric acid : B : O₂
(c) A : Succinic acid : B : H₂
(d) A : Tartaric acid : B : CO₂

Question. When CO₂ is passed through lime water, it turns milky. the milkiness in due to formation of
(a) CaCO₃
(b) Ca(OH)₂
(c) H₂O
(d) CO₂

Question. Acetic acid was added to a solid X kept in a test tube. A colourless and odourless gas was evolved. The gas was passed through lime water which turned milky. It was concluded that.
(a) Solid X is sodium hydroxide and the gas evolved is CO₂
(b) Solid X is sodium bicarbonate and the gas evolved is CO₂
(c) Solid X is sodium acetate and the gas evolved is CO₂
(d) Solid X is sodium chloride and the gas evolved is CO₂

Question. Consider the following reaction:

Here, A,B,C and D respectively are :
(a) A = Conc. HCl; B = Fe; C = NH₄OH; D = PbO
(b) A = Conc. H₂SO₄ ; B = Fe; C = NH4OH; D = Pb(NO₃)₂
(c) A = Conc. H₂SO₄ B = Fe; C = NH₃ ; D = Pb(NO₃)₂
(d) A = Conc. HCl; B = Fe; C = NH3 ; D = PbO

Question. In one of the industrial processes used for manufacture of sodium hydroxide, a gas X is formed as by-product. The gas X reacts with lime water to give a compound Y which is used as a bleaching agent in chemical industry. The compound X and Y could be
(a) H₂ and NaHCO₃ respectively
(b) CO₂ and CaOCl₂ respectively
(c) Cl₂ and CaOCl₂ respectively
(d) Cl₂ and NaHCO₃ respectively

Question. Plaster of pairs is made from-
(a) lime stone
(b) slaked lime
(c) quick lime
(d) gypsum

Question. A blue litmus paper was first dipped in dil. HCl and then in dil. NaOH solution. It was observed that the colour of the litmus paper-
(a) changed to red
(b) changed first to red and then to blue
(c) changed blue to colourless
(d) remains blue in both the solutions

Question. Bleaching powder is soluble in cold water giving a milky solution due to-
(a) available chlorine
(b) lime present in it
(c) calcium carbonate formation
(d) The absorption of carbon dioxide from atmosphere

Question. Reaction of an acid with a base is known as-
(a) decomposition
(b) combination
(c) redox reaction
(d) neutralization

Question. The pH of a solution is 4.0. What should be the change in the hydrogen ion concentration of the solution, if its pH is to increased to 5.0.
(a) decreases to 1/10 of its original concentration
(b) halved
(c) doubled
(d) increases by 10 times

Question. 2NaOH + MgSO₄ →?
(a) MgO + Na₂SO₄
(b) Mg(OH)₂ + Na₂SO₄
(c) Mg(OH)₂ + Na₂O
(d) MgO + Na₂O

Question. The reaction of metal with acid results in the formation of-
(a) only hydrogen gas
(b) only salt
(c) both salt and hydrogen gas
(d) none of these

Question. Plaster of Paris hardens by-
(a) giving of CO²
(b) changing into CaCO₃
(c) combining with water
(d) giving out water

Question. On prolong supply of CO₂(g) in lime solution (limewater), it is observed that
(a) lime solution changes to gaseous state
(b) the milkiness of lime water disappears
(c) the milkiness of lime water changes from white to red.
(d) the colour of lime water becomes black

Question. Antacids contain-
(a) weak base
(b) weak acid
(c) strong base
(d) strong acid

Question. Incorrect statement about acids is/are
(a) they have sour taste
(b) they may change the colour of indicator
(c) they changes the colour or blue litmus to red
(d) they change the colour of red litmus to blue

Fill In The Blank

Question. The salts of a strong acid and strong base are ……… with pH value of 7. On the other hand, salts of strong base and weak acid are ……… with pH value ……… than 7 and those of a strong acid and weak bases are ……… in nature with pH value ……… than 7.

Question. Binary acid contain ……… atom.

Question. Anhydrous sodium carbonate is commonly known as ……..

Question. When an acid reacts with a metal carbonate or metal hydrogen carbonate, it gives the corresponding salt, …….. gas and …….. .

Question. ……… is the fixed number of water molecules chemically attached to each formula unit of a salt in its crystalline form.

Question. When an acid reacts with a metal, ……… gas is evolved and a corresponding ……… is formed.

Question.  ………. is a natural indicator whereas ……… is a synthetic indicator. A ………. indicator is a mixture of several indicators.

Question. Soda-acid fire extinguisher contains a solution of sodium hydrogen carbonate and …….. .

Question. All alkali are bases but all bases are …….. alkali.

True/False

Question. Acids and bases neutralise each other to form corresponding salts and water.

Question. When a base reacts with a metal, along with the evolution of hydrogen gas a salt is formed which has a positive ion composed of the metal and oxygen.

Question. Mixing concentrated acids or bases with water is a highly endothermic process.

Question. Sodium hydrogen carbonate is used in fire extinguisher.

Question. The colour of caustic soda turns pink when phenolphthalein is added.

Question. Washing soda on strong heating gives sodium oxide and carbon dioxide.

Question. There are a variety of strengths when you study acids and bases.

Question. Solution of sodium hydrogen carbonate is alkaline in nature.

Question. Acidic or basic solutions in water conduct electricity as they produce hydrogen and hydroxide ions respectively.

Question. An aqueous solution is one that has compounds dissolved in water.

Matching Questions

Question. Column II gives type of reaction mention in column I, match them correctly.

Question.

Assertion And Reason

Question. Assertion : HCl produces hydronium ions (H³O⁺) and chloride ions (Cl^–) in aqueous solution.
Reason : In presence of water, basic give H⁺ ions.

Question. Assertion : H₂CO₃ is a strong acid.
Reason : A strong acid dissociates completely or almost completely in water.

Question. Assertion : During electrolysis of concentrated aqueous solution of sodium chloride, hydrogen is produced at anode and chlorine gas is produced at cathode.
Reason : Ions get attracted to oppositely charged electrodes.

Question. Assertion : H₃PO₄ and H₂SO₄ are known as polybasic acids.
Reason : They have two or more than two protons per molecule of the acid.
Ans : (a) Both A and R are true and R is the correct

Question. Assertion : If the pH inside the mouth decreases below 5.5, the decay of tooth enamel begins.
Reason : The bacteria present in mouth degrades the sugar and left over food particles and produce acids that remains in the mouth after eating.

Question. Assertion : The aqueous solutions of glucose and alcohol do not show acidic character.
Reason : Aqueous solutions of glucose and alcohol do not give H⁺ ions.

Question. Assertion : The acidity of Mg(OH)₂ is two.
Reason : The acidity of a base is equal to the number of hydroxyl ions.

Question. Assertion : pH = 7 signifies pure water.
Reason : At this pH, [H⁺] = [OH^–] = 10^-7 .

Question. Assertion : To dilute concentrated sulphuric acid water is added to the acid slowly.
Reason : A lot of heat energy will be given out in the dilution of concentrated sulphuric acid.

Question. Assertion : Pure water is neither acidic not basic.
Reason : The pH of a solution is inversely proportional to the concentration of hydrogen ions in it.

Question. Assertion : Sodium hydroxide reacts with zinc to produce hydrogen gas.
Reason : Acids reacts with active metals to produce hydrogen gas.

Question. Assertion : Salts are the products of an acid-base reaction.
Reason : Salt may be acidic or basic.