MCQ
The heaviest atom amongst the following is
- ✓$U$
- B$Ra$
- C$Pb$
- D$Hg$
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(Given : $\left.pK _{ a }\left( CH _{3} COOH \right)=4.76\right)$
$\log 2=0.30$ $\log 3=0.48$ $\log 5=0.69$ $\log 7=0.84$ $\log 11=1.04$
$(A)$ $NH _4 NO _3$ $(B)$ $\left( NH _4\right)_2 Cr _2 O _7$ $(C)$ $Ba \left( N _3\right)_2$ $(D)$ $Mg _3 N _2$
$I :$ form sets of compounds which display different oxidation states of the metal
$II :$ form coloured ions in solution
$III :$ burn vigorously in oxygen
$IV :$ act as catalyst