The correct answer is (c) (i) and (iv). Alloys are mixtures of two metals (e.g., brass – copper and zinc) or a metal and mercury (called an amalgam, e.g., silver amalgam used in dental fillings). Non-metals generally do not form ...
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The correct answer is (b) Sulphur in CS₂. Sulfur dissolves completely in carbon disulfide (CS₂) to form a true solution, not a colloid. In contrast, starch in water, soap solution, and petrol in CS₂ form colloidal dispersions. Class 9th Science ...
During a chemical change, both the chemical and physical properties of a substance change (c). The composition of the substance is altered, forming a new substance with different properties, such as color change, gas formation, or energy release in the ...
The compound FeS (Iron(II) sulfide) is not attracted by a magnet because iron has lost its magnetic properties (d). During the chemical reaction between iron and sulfur, a new compound forms, where iron atoms are bonded with sulfur, altering its ...
The metalloid among these is (b) Germanium. Metalloids have properties of both metals and non-metals. Germanium is a semiconductor, meaning it conducts electricity under certain conditions, making it useful in electronics. Sodium and magnesium are metals, while oxygen is a ...