Which of the following pair of the elements are liquids at 25 and 1atm pressure?
Hg and I
Au and Kr
Pt and Co
Ag and Kr
Hg and Br
A
Hg and Br
B
Pt and Co
C
Hg and I
D
Au and Kr
E
Ag and Kr
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Solution
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Two elements which are liquid at room temperature (298 K) and 1 atm pressure are :
1. Bromine (Br), a reddish-brown liquid with a suffocating odour, melts at 265.9 K.
2. Mercury (Hg), a toxic metal, melts at 234.32 K.
Hence the correct option is A.
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