201. Sulfuric acid is treated with _______.
Answer: H₂
202. Quick lime is _______.
Answer: CaO
203. Slaked lime slowly reacts with CO₂ in the air to form _______.
Answer: CaCO₃
204. During respiration in cells, _______ combines with oxygen to produce CO₂ and water.
Answer: Glucose
205. The color of iron pyrite crystal is _______.
Answer: Green
206. When lead nitrate is heated, the emission of _______ is observed.
Answer: NO₂
207. Na₂SO₄ + BaCl₂ → BaSO₄ + 2NaCl is an example of _______ reaction.
Answer: Double Displacement
208. Chips manufacturers usually flush the chips bags with _______ gas to prevent oxidation.
Answer: Nitrogen
209. When excess carbon dioxide is passed through lime water, _______ is obtained.
Answer: Ca(HCO₃)₂
210. The solution of _______ does not conduct electricity.
Answer: Glucose
211. The pH of blood is
Answer: 7.4
212. Our stomach produces _______ acid that helps in digestion.
Answer: Hydrochloric acid
213. The stinging pain from the hairs of a nettle plant is caused by _______ acid.
Answer: Methanoic acid
214. Baking soda is
Answer: Sodium hydrogen carbonate
215. _______ is used in the preparation of borax.
Answer: Baking soda
216. Plaster of Paris (POP) is
Answer: CaSO₄.½H₂O
217. The ability to draw metals into thin wires is called _______.
Answer: Ductility
218. _______ is a highly malleable metal.
Answer: Au
219. _______ is a non-metal but has a shiny appearance.
Answer: Iodine
220. _______ does not react with cold water.
Answer: Sodium