Class 10th Science Chapter – 1 Chemical Reactions and Equations
| Textbook | NCERT |
| Class | 10th |
| Subject | Science |
| Chapter | 1st |
| Chapter Name | Chemical Reactions and Equations |
| Category | Class 10th Science |
| Medium | English |
| Source | Last Doubt |
| NCERT Solutions Class 10th Science Chapter – 1 Chemical Reactions and Equations Notes In This Chapter we will learn about Chemical Reaction and Equation, Reactions, Simplest Way to Write Word Equation, Balanced equation follow some importance ways, Endothermic, Exothermic, Types of Chemical Reaction and more such things for more knowledge about this Chapters read their MCQ with Answer |
Class 10th Science Chapter – 1 Chemical Reactions and Equations
Chapter – 1
Chemical Reactions and Equations
MCQ
| (1) Reaction of ‘magnesium’ with air is A. Exothermic reaction B. Endothermic reaction C. Reversible reaction D. Substitution reaction Ans – (A) Exothermic reaction |
| (2) What chemicals are used in fireworks? A. Copper chloride B. Calcium chloride C. Barium chloride D. All of above Ans – (D) All of above |
| (3) When a magnesium ribbon is burnt in air, the ash formed is A. Black B. White C. Yellow D. Pink Ans – (B) White |
| (4) Color of magnesium oxide is A. White B. Blue C. Grey D. Pink Ans – (A) White |
| (5) If magnesium is gently heated, it forms A. Magnesium oxide B. Magnesium sulfide C. Magnesium nitrite D. Magnesium carbonate Ans – (A) Magnesium oxide |
| (6)When carbon dioxide is passed through lime water, A. Calcium hydroxide is formed B. White precipitate of CaO is formed C. Lime water turns milky D. Color of lime water disappears. Ans – (C) Lime water turns milky |
| (7) When crystals of lead nitrate are heated strongly in a dry test tube A. Crystals immediately melt B. A brown residue is left C. White fumes appear in the tube D. A yellow residue is left Ans – (D) A yellow residue is left |
| (8) Color of Solid magnesium is A.Dark grey B. Silver grey C. Black D. Whitish silver Ans – (B) Silver grey |
| (9)Consider equation: Pb2 (aq) + 20H¯ (aq) → Pb(OH)2(S). precipitate of lead (II) hydroxide will be of A. Green color B. Blue color C. Brown color D. White color Ans – (D)White color |
| (10) The reaction in which two compounds exchange their ions to form two new compounds is called A. Displacement reaction B. Combination reaction C. dоublе displacement reaction D. Redox reaction Ans – (C) dоublе displacement reaction |
| (11) On immersing an iron nail in CuSO, solution for a few minutes, you will observe A. No reaction takes place B. The color of solution fades away C. The surface of iron nails acquire a black coating D. The color of solution changes to green Ans – (D) The color of solution changes to green |
| (12) Rancidity can be prevented by A. Adding antioxidants B. Storing food away from light C. Keeping food in refrigerator D. All of these Ans – (B) Storing food away from light |
| (13) In which of the given, heat energy will be evolved? A. Electrolysis of water B. Dissolution of NH4Cl in water C. Burning of L.P.G. D. Decomposition of AgBr in the presence of sunlight Ans – (C) Burning of L.P.G. |
| (14) Dilute hydrochloric acid is added to granulated zinc taken in a test tube. The following observations are recorded. Point out the correct observation. A. The surface of metal becomes shining B. The reaction mixture turns milky C. Odour of a pungent smelling gas is recorded D. A colorless and odourless gas is evolved Ans – (D) A colorless and odourless gas is evolved |
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