Q. The most commonly used method for the refining of impure metals is electrolysis.
The correct answer was: Refining
Q. The pH value decreases.
The correct answer was: Hydronium
Q. After being left in the air for some time, _______ turns black.
The correct answer was: Copper
Q. When baking soda is heated or mixed with water, _______ is produced, which raises bread or cake and makes them fluffy and soft.
The correct answer was: Carbon dioxide
Q. Sulfide ores convert to oxides when heated strongly in the presence of excess air. This process is called _______.
The correct answer was: Roasting
Q. _______ does not react with dilute HCl.
The correct answer was: Copper
Q. Aqua regia is a fresh mixture made in the ratio of concentrated hydrochloric acid and concentrated nitric acid of ________.
The correct answer was: 3:1
Q. An alloy of lead and tin is called.
The correct answer was: Solder
Q. Plaster of Paris is a white powder, and when mixed with water, it turns into ________.
The correct answer was: Gypsum
Q. Non-metals do not _______ displace hydrogen from dilute acids.
The correct answer was: Hydrogen
Q. The electrical conductivity and melting point of an alloy is _______ compared to that of a pure metal.
The correct answer was: Lower
Q. Present in vinegar.
The correct answer was: Acetic acid
Q. Ores mined from the earth are generally contaminated with a large quantity of impurities such as soil, sand, etc., which are called ________.
The correct answer was: Gangue
Q. Alcohol reacts with sodium to produce _______.
The correct answer was: Hydrogen
Q. _______ causes blindness by affecting the optic nerve.
The correct answer was: Methanol
Q. A homogeneous mixture of two or more metals or a metal and a non-metal is called ________.
The correct answer was: Metalloid
Q. Alkaline potassium permanganate or acidified potassium dichromate oxidizes alcohol to _______.
The correct answer was: Aldehyde
Q. Alkalis generate _______ ions in water.
The correct answer was: OH-
Q. In the chlor-alkali process, _______ gas is given off at the anode.
The correct answer was: Chlorine
Q. Acid + Metal → Salt + _______
The correct answer was: Hydrogen gas
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