241. The pH of milk of magnesia is _______.
Answer: 10.5
242. Venus’s atmosphere is composed of thick white and yellow clouds of _______.
Answer: H₂SO₄
243. _______ acid is present in tomatoes.
Answer: Tartaric
244. An aqueous solution of sodium chloride is called _______.
Answer: Saline
245. Bleaching powder represents _______.
Answer: CaOCl₂
246. Recrystallization of sodium carbonate produces _______.
Answer: Washing soda
247. _______ is used as plaster to support fractured bones in the correct position.
Answer: CaSO₄.½H₂O
248. The metal that exists as a liquid at room temperature is _______.
Answer: Mercury
249. Which is the hardest allotrope of carbon in nature?
Answer: Diamond
250. _______ is an amphoteric oxide.
Answer: Al₂O₃
251. Burning magnesium in air is a
Answer: Chemical change
252. The formation of lime from marble by reacting with atmospheric moisture and CO₂ is an example of
Answer: Decomposition reaction
253. A compound X reacts with CO₂ present in the air to form compound Y. Compound Y produces an oxide. Compound X is
Answer: Ca(HCO₃)₂
254. Barium can displace which element from its sulfate?
Answer: Hydrogen
255. The decomposition of glucose is
Answer: Exothermic reaction
256. The empty space in a packet of snacks is filled with an inert gas to prevent _______.
Answer: Oxidation
257. When exposed to light, the color of a transparent photographic layer gradually changes due to _______.
Answer: Oxidation reaction
258. When aluminum comes into contact with atmospheric O₂, it forms Al₂O₃. This is
Answer: Corrosion
259. When blue CuSO₄ crystals are heated, a white anhydrous solid is obtained. The white solid is
Answer: CuSO₄
260. The color of phenolphthalein in an acidic medium is
Answer: Colorless