CBSE Exam Paper

CBSE Class 10 Science Answer Key 2023 CBSE Class 10 Science Answer Key 2023 (Set - 3)  1. When aqueous solutions of potassium iodide and lead nitrate are mixed, an insoluble substance separates out. The chemical equation for the reaction involved is: (a) KI+PbNO3 --> PbI + KNO3 (b) 2KI+Pb(NO3)2 --> PbI2 + 2KNO3 (c) KI+PbNO3)2 --> PbI + KNO3 (d) KI+PbNO3 --> PbI2 + KNO3 Answer: (b) 2KI+Pb(NO3)2 --> PbI2 + 2KNO3 2. When Sodium bicarbonate reacts with dilute hydrochloric acid, the gas evolved is: (a) Hydrogen; it gives pop sound with burning match stick. (b) Hydrogen; it turns lime water milky. (c) Carbon dioxide; it turns lime water milky. (d) Carbon dioxide; it blows off a burning match stick with a pop sound. Answer: (c) Carbon dioxide; it turns lime water milky. 3. Acid present in tomato is: (a) Methanoic acid (b) Acetic Acid (c) Lactic acid (d) Oxalic acid Answer: (d) Oxalic acid 4. A metal ribbon 'X' burns in oxygen with a dazzling white flame forming a white ...

Series WYXZ1/4                   Set No. 3 Q.P. Code 2/4/3 Roll No. Candidates must write the Q.P. Code on the title page of the answer-book. ENGLISH (Language and Literature) Time allowed: 3 hours Maximum Marks: 80 Note (I) Please check that this question paper contains 15 printed pages. (II) Q.P. Code given on the right hand side of the question paper should be written on the title page of the answer-book by the candidate. (III) Please check that this question paper contains 11 questions. 39 (IV) Please write down the Serial Number of the question in the answer-book before attempting it. (V) 15 minute time has been allotted to read this question paper. The question paper will be distributed at 10.15 a.m. From 10.15 a.m. to 10.30 a.m., the students will read the question paper only and will not write any answer on the answer-book during this period. General Instructions: Read the instructions very carefully and strictly foll...