GK
CHEMISTRY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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He
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O
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H
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Hg
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Detailed explanation-1: -Although hydrogen is placed at the top of Group 1A in most versions of the periodic table, it is very different from the other members of the alkali metal group. In its elemental form, hydrogen is a colorless, odorless, extremely flammable gas at room temperature, consisting of diatomic molecules of H2.
Detailed explanation-2: -Elemental hydrogen (H, element 1), nitrogen (N, element 7), oxygen (O, element 8), fluorine (F, element 9), and chlorine (Cl, element 17) are all gases at room temperature, and are found as diatomic molecules (H2, N2, O2, F2, Cl2).
Detailed explanation-3: -There are no metals as of now that are known to have gaseous phase at room temperatures. All metals are solid in room temperature except for mercury, which is liquid.
Detailed explanation-4: -Mercury is the only liquid metal found at normal temperatures.
Detailed explanation-5: -There are gaseous elements in the periodic table. Names: Hydrogen, Helium ( ), Nitrogen, Oxygen, Fluorine, Chlorine, Argon (, Krypton, Xenon, Radon, Neon .