Chemistry
Circle the odd one out on the basis of the property given in the brackets.
(a) hydrogen, nitrogen, chlorine, phosphorus (state)
(b) sodium, potassium, iron, lithium (hardness)
(c) graphite, diamond, iodine, coal (forms of a same element)
(d) helium, neon, argon, bromine (reactivity)
Elements, Compounds & Mixtures
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Answer
(a) Phosphorus
Reason — Phosphorus is present in solid state under normal conditions, whereas, hydrogen, nitrogen, and chlorine are gases at room temperature.
(b) Iron
Reason — Iron is hard metal, while, sodium, potassium and lithium are soft metals.
(c) Iodine
Reason — Coal, diamond and graphite are all different forms of carbon but iodine is a different element.
(d) Bromine
Reason — Bromine is a reactive element. While, helium, neon and argon are non-reactive nobel gases.
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Related Questions
Indicate whether the following statements are true or false.
(a) A compound is made up of just one kind of atom. ……………
(b) Metals reflect light and are good conductors of electricity. ……………
(c) Metals can be polished. ……………
(d) Elements are made up of compounds. ……………
(e) All elements are artificially prepared. ……………
(f) Molecules can exist independently. ……………
(g) Molecules combine to form atoms. ……………
(h) Noble gases are highly reactive. ……………
(i) Ozone is a triatomic molecule. ……………
Match the columns:
Column A Column B (a) Metals (i) Non-reactive (b) Molecules (ii) Brittle (c) Non-metals (iii) Lustrous (d) Nobel gases (iv) Smallest unit of compound Name:
(a) Three different forms of carbon.
(b) A form of carbon used as a gem.
(c) Two substances used to make electric wires.
(d) Two substances used to make jewellery.
(e) A substance used as an insulator.
Give one use of each of the following substances:
(a) Iron
(b) Brass
(c) Coal