MCQ
Silicon is an important constituent of
- ✓Rocks
- BAmalgams
- CChlorophyll
- DHaemoglobin
Amalgams contains $Hg$.
Haemoglobin contains iron.
Chlorophyll contains $Mg$.
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Assertion $A$ :Magnesium can reduce $Al _{2} O _{3}$ at a temperature below $1350^{\circ} C$, while above $1350^{\circ} C$ aluminium can reduce $MgO$.
Reason $R$ : The melting and boiling points of magnesium are lower than those of aluminium.
In light of the above statements. choose most appropriate answer from the options given below
$(I){\mkern 1mu} C{H_3}CH_2^ - {\mkern 1mu} + {\mkern 1mu} \mathop {C{H_3}N{H_2}}\limits_{p{K_a} = 35} \rightleftharpoons \mathop {C{H_3}C{H_3}}\limits_{p{K_a} = 50} + C{H_3}N{H^ - }$
$(II){\mkern 1mu} {F^ - }{\mkern 1mu} + {\mkern 1mu} \mathop {{H_2}O}\limits_{p{K_a} = 15.7} \rightleftharpoons \mathop {HF}\limits_{p{K_a} = 3.2} + H{O^ - }$