UPSC Chemistry-Chemistry, Matter and its Composition Set 2

increase in speed of gaseous molecules ✘ increase in collision among gaseous molecules ✘ decrease in speed of gaseous molecules ✘ decrease in collision among gaseous molecules. ✔

sulphur-di-oxide ✘ chlorine ✘ ammonia ✘ urea ✔

aromatic hydrocarbons ✘ aliphatic hydrocarbons ✘ saturated hydrocarbons ✘ alicyclic hydrocarbons ✔

Silicon ✘ Nitrogen ✘ Carbon ✘ Phosphorus ✔

Air ✘ Mercury ✘ Milk ✘ Cement ✔

A mixture shows the properties of its constituents but the properties of a compound are entirely different from its constituents ✘ A mixture may be homogeneous or heterogeneous but a compound is a homogeneous substance ✘ The constituents of a mixture can be separated by physical methods but those of a compound cannot be separated by physical methods ✘ Energy is either absorbed or evolved during the preparation of a mixture but not in the preparation of a compound ✔

Graphite ✘ Glass ✘ Brass ✘ Steel ✔

solid ✘ Bose-Einstein condensation ✘ plasma ✘ liquid ✔

Toot paste ✘ Toilet soap ✘ Baking soda ✘ Vinegar ✔

mixture of potassium iodide and common salt ✘ mixture of molecular iodide and common salt ✘ compound formed by combination of potassium iodide and common salt ✘ compound formed by molecular iodine and common salt ✔