Acid bases and salts 10mcq

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Class 10 - Science Term 1 - Acids Bases and Salts - 01 Match the following with correct response. (1) Citric acid (A) Vinegar (2) acetic acid (B) tamarind (3) Nitric acid (C) mineral acid (4) Tartaric acid (D) Lemon 1-A, 2-C, 3-B, 4-D 1-D, 2-A, 3-C, 4-B 1-B, 2-D, 3-A, 4-C 1-C, 2-B, 3-D, 4-A Equal volumes of hydrochloric acid and sodium hydroxide solutions of same concentration are mixed and the pH of the resulting solution is checked with a pH paper. What would be the colour obtained? (You may use colour guide given in Figure Red Blue Yellowish green Yellow Honey bee sting contains Acetic acid None of these Formic acid Butyric acid To practice more questions & prepare well for exams, download myCBSEguide App. It provides complete study material for CBSE, NCERT, JEE (main), NEET-UG and NDA exams. An aqueous solution with pH-zero is Amphoteric Neutral Alkaline Acidic Match the chemical substances given in Column (A) with their appropriate application given in Column (B) Column (A) Column (B) (A) Bleaching powder (i) preparation of glass (B) Baking soda (ii) Production of H2 and Cl2 (C) Washing soda (iii) Decolourisation (D) Sodium chloride (iv) Antacid A- (ii), B - (i), C - (iv), D - (iii) A - (iii), B - (iv), C - (i), D - (ii) A- (ii), B - (iv), C - (i), D - (iii) A - (iii), B - (ii), C - (iv), D - (i) Match the following with correct response. Column A Column B (i) Sodium hydroxide (a) Antacid (ii) Potassium hydroxide (b) Caustic soda (iii) Calcium hydroxide (c) Curd (iv) Lactic acid (d) Caustic potash (i) - (a), (ii) - (c), (iii) - (b), (iv) - (d) (i) - (c), (ii) - (b), (iii) - (d), (iv) - (a) (i) - (b), (ii) - (d), (iii) - (a), (iv) - (c) (i) - (d), (ii) - (a), (iii) - (c), (iv) - (b) Many salts absorbs water from atmosphere. This property is called Decomposition Hydration Deliquescence Florescence Which of the following phenomena occur, when a small amount of acid is added to water? Ionization Neutralization Dilution Salt formation (i) and (iii) (ii) and (iii) (i) and (ii) (ii) and (iv) One of the constituents of baking powder is sodium hydrogencarbonate, the other constituent is Acetic acid Sulphuric acid Tartaric acid Hydrochloric acid Higher the hydronium ion concentration higher is the pH value lower is the pH value moderate is the pH value pH value is the zero To practice more questions & prepare well for exams, download myCBSEguide App. It provides complete study material for CBSE, NCERT, JEE (main), NEET-UG and NDA exams. For question numbers 11-15, two statements are given- one labeled Assertion (A) and the other labeled Reason (R). Select the correct answer to these questions from the codes (a), (b), (c) and (d) as given below: Both A and R are true and R is the correct explanation of A. Both A and R are true but R is not the correct explanation of A. A is true but R is false. A is false but R is true. Assertion: The acidity of Mg(OH)2 is two. Reason: The acidity of a base is equal to the number of hydroxyl ions. 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. Assertion: H2CO3 is a strong acid. Reason: A strong acid dissociates completely or almost completely in water. 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. Assertion: HCl gas does not change the color of dry blue litmus paper. Reason: HCl gas dissolves in the water present in wet litmus paper to form H+ ions. Answer questions 16-20 based on the following case study: Read the following and answer the questions: Common salt is an important raw material for various materials of daily use such as sodium hydroxide, baking soda, bleaching powder. These material are prepared by various procedures such as sodium hydroxide is prepared when electricity is passed through an aqueous solution of NaCl it decomposed to form sodium hydroxide. The process is called the chloralkali process. While bleaching powder is prepared by the action of chlorine on dry slaked lime (Ca(OH)2). Washing soda is prepared by crystallisation of sodium carbonate. The product of the Chlor-alkali process is NaCl, Cl2 and H2 H2, Cl2 and NaOH Cl2, Na2CO3 and H2O NaOH, Cl2 and HCl Name an acid present in baking powder. HCl Nitric acid Tartaric acid Sulphuric acid Washing soda is acidic salt neutral salt basic salt none of the above Which salt is used in the manufacturing of borax? Washing soda Bleaching powder Baking soda None of the above Sodium hydroxide solution is formed near the: anode cathode both cathode and anode neither cathode nor anode Term 1 - Acids Bases and Salts - 01 Class 10 - Science Solution (b) 1-D, 2-A, 3-C, 4-B Explanation: Lemon conatins citric acid, vinegar contains acetic acid, nitric acid is a mineral acid and tamarind contains tartaric acid. (c) Yellowish green Explanation: The neutralization reaction takes place when hydrochloric acid and sodium hydroxide are mixed. (c) Formic acid Explanation: Formic acid, also known as methanoic acid, in the bee sting causes itching in the skin. (d) Acidic Explanation: Lower the pH, greater is the acidity. The solution with pH = 0 is highly acidic. (b) A - (iii), B - (iv), C - (i), D - (ii) Explanation: A- (iii), B - (iv), C- (i), D - (ii) Bleaching powder has got its name because of bleaching property. Baking soda is used as an antacid as a common household remedy. Sodium chloride (common salt) is used for making various chemicals through chloralkali process. (c) (i) - (b), (ii) - (d), (iii) - (a), (iv) - (c) Explanation: Caustic soda chemically is sodium hydroxide, caustic potash is chemically potassium hydroxide, antacid contains calcium hydroxide and curd contains lactic acid. (c) Deliquescence Explanation: Deliquescence refers to the property of a substance to absorb water from the air to dissolve itself and form an aqueous solution. Materials with this property are termed deliquescent. (a) (i) and (iii) Explanation: Ionization can be defined as the dissociation of molecule into its respective ions. Mixing of an acid with water decreases the concentration of acid and is called as dilution. (c) Tartaric acid Explanation: Tartaric acid used in baking powder where it serves as the source of acid that reacts with baking soda. This reaction produces carbon dioxide gas and lets products rise using active yeast cultures as a source of carbon dioxide gas. (b) lower is the pH value Explanation: The hydrogen ion concentration is represented by the symbol [H+]. The pH is defined as pH = -log [H+] ie, it’s the negative logarithm of the H+ concentration. In water, H+ is really H3O+ (the hydronium ion). The greater the concentration of the hydronium ion, the lower the value of pH. It is simply logarithms. It has nothing to do with the chemistry behind it. (a) Assertion and reason both are correct statements and reason is correct explanation for assertion. Explanation: Assertion and reason both are correct statements and reason is correct explanation for assertion. (a) Assertion and reason both are correct statements and reason is correct explanation for assertion. Explanation: Assertion and reason both are correct statements and reason is correct explanation for assertion. (d) Assertion is wrong statement but reason is correct statement. Explanation: H2CO3 carbonic acid is a weak acid. (a) Assertion and reason both are correct statements and reason is correct explanation for assertion. Explanation: Water is never added to concentrated sulphuric acid as it is an exothermic reaction and releases a large amount of heat energy. It also results in the spurting of the acid, which can burn your skin. Concentrated sulphuric acid is added to water in small amounts and that too with constant stirring and cooling. (a) Both A and R are true and R is the correct explanation of the assertion. Explanation: Both A and R are true and R is the correct explanation of the assertion. HCl gas does not change the color of dry blue litmus paper. Blue litmus paper will change to red only when, HCl gas dissolves in the water to form H+ ions. (b) H2, Cl2 and NaOH (b) Tartaric acid (c) basic salt (a) Washing soda (b) cathode