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Which non-metal is in liquid form at ordinary room temperature?
A. Sulphur
B. Bromine
C. Carbon
D. Iodine
Correct Answer Is Option = Bromine
Notes / Explanation
The non-metal that is in liquid form at ordinary room temperature is bromine, which is unusual because most non-metals are either gases or solids at ordinary temperatures, and bromine is one of the very few that exist as a liquid. The elements are often divided into two broad groups, the metals and the non-metals, which differ in many of their properties. Non-metals include a variety of substances, some of which are gases at ordinary temperatures, such as oxygen and nitrogen, and some of which are solids, such as carbon and sulphur, but very few non-metals are liquids at ordinary room temperature, and bromine is the main example among the non-metals. Bromine is a reddish-brown liquid that gives off a coloured vapour and has a strong, sharp and unpleasant smell, and it is a reactive substance. Because it is both poisonous and capable of causing harm on contact, bromine must be handled with great care. It is worth noting that bromine and mercury are often mentioned together as the two elements that are liquid at ordinary room temperature, with bromine being the liquid non-metal and mercury being the liquid metal, so that these two provide a matching pair of examples that are frequently asked about together. Bromine belongs to a group of related non-metallic elements, the members of which show a gradual change in their physical state, with the lighter members of the group being gases, one member being a liquid, and the heavier members being solids, so that bromine falls in the middle as the liquid member of the group. Bromine and its compounds have a number of uses, for example in certain chemicals, dyes and other products, although some of its uses have been reduced because of concerns about safety and the environment. The study of the elements and their states at ordinary temperatures is a part of the study of chemistry, and the fact that bromine is a liquid non-metal is one of the notable exceptions to the general pattern. For PPSC and other competitive examinations, the key points to remember are that the non-metal that is liquid at ordinary room temperature is bromine, that this is unusual because most non-metals are gases or solids, that bromine is a reddish-brown liquid with a strong unpleasant smell, and that bromine and mercury are the two elements commonly cited as being liquid at room temperature, bromine being the non-metal and mercury being the metal.
