CBSE 10th Science Board Exam 2023: Download Paper PDF - Check Analysis, Review & Updates

CBSE 10th Science board exam 2023 was conducted on 4 March 2023. Download CBSE 10th Science question paper pdf & also check analysis, review and latest updates about CBSE 10th Science board exam 2023. - Download CBSE 10th Science Exam 2023 Question Paper PDF: bit.ly/3ZoxCKC - List of Tricky Questions In CBSE 10th Science Board Exam 2023: SECTION-A (Multiple Choice Questions) 1. 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. 2. When aqueous solutions of potassium iodide and lead nitrate are mixed, an insoluble substance separates out. The chemical equation for the reaction. involved is the real (a) KI+PbNO → PbI + KNO3 (b) 2KI+ Pb(NO3)2 → Pbl2+ 2KNO3 (c) KI+ Pb(NO3)2 → PbI + KNO3 (d) KI+ PbNO3 → Pbl2 + KNO3 3. A metal ribbon 'X' burns in oxygen with a dazzling white flame forming a white ash 'Y'. The correct description of X, Y and the type of reaction is: (a) X = Ca; Y= CaO; Type of reaction = Decomposition (b) X = Mg; Y = MgO; Type of reaction = Combination (c) X=Al; Y = Al2O3; Type of reaction = Thermal decomposition (d) X=Zn; Y = ZnO ; Type of reaction = Endothermic 4.Acid present in tomato is: (a) Methanoic acid (b) Acetic acid (c) Lactic acid (d) Oxalic acid 5. Sodium hydroxide is termed an alkali while Ferric hydroxide is not because: (a) Sodium hydroxide is a strong base, while Ferric hydroxide is a weak base. (b) Sodium hydroxide is a base which is soluble in water while Ferric hydroxide is also a base but it is not soluble in water. (c) Sodium hydroxide is a strong base while Ferric hydroxide is a strong acid. (d) Sodium hydroxide and Ferric hydroxide both are strong base but the solubility of Sodium hydroxide in water is comparatively higher than that of Ferric hydroxide. 6. The name of the salt used to remove permanent hardness of water is: (a) Sodium hydrogen carbonate (NaHCO3) (b) Sodium chloride (NaCl) (c) Sodium carbonate decahydrate (Na2CO3.10H2O) (d) Calcium sulphate hemihydrate (CaSO4.1/2HI2O)

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