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 ...
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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 ...
Ordinary starch stirred with cold water will result in a suspension (c) because starch particles do not dissolve in cold water but remain dispersed as insoluble particles. This mixture is heterogeneous, and the starch eventually settles at the bottom over ...