141. Precipitation reactions produce _______.
Answer: Insoluble Salts
142. What happens when sulfuric acid is mixed with zinc?
Answer: H₂ gas and ZnSO₄ are formed
143. 2NaOH(aq) + Zn(s) → X + H₂(g); X is
Answer: Sodium Zincate
144. Passing carbon dioxide gas through lime water produces _______.
Answer: CaCO₃
145. Metallic oxides are called
Answer: Basic Oxides
146. When a metal reacts with _______, hydrogen gas is not produced.
Answer: HNO₃
147. Copper does not react with _______.
Answer: All of the above
148. The number of electrons in the M shell of phosphorus is _______.
Answer: 5
149. Cinnabar is an ore of _______.
Answer: Mercury
150. When heated strongly in limited air, ores are converted to oxides.
Answer: Sulfides
151. White silver chloride in sunlight turns _______.
Answer: Gray
152. Zinc and lead are more reactive than _______.
Answer: Copper
153. When fats and oils are _______ they become rancid and their smell and taste change.
Answer: Spoiled
154. When the litmus solution is neither acidic nor alkaline, its color turns _______.
Answer: Purple
155. Some substances whose smell changes from acidic medium to alkaline medium are called _______ indicators.
Answer: Aromatic
156. The melting point of pure acetic acid is _______ and therefore, it often freezes in cold weather.
Answer: 190 K
157. Acetic acid reacts with _______ catalyst to form an ester with full ethanol.
Answer: Alkali
158. Sodium hydroxide, which is an alkali, reacts to form an ester with alcohol and sodium salt of the carboxylic acid. This reaction is called _______.
Answer: Saponification
159. Generally, _______ states are not included in a chemical reaction unless specifying is necessary.
Answer: Physical
160. When a decomposition reaction is carried out by _______ it is called thermal decomposition.
Answer: Heating