MCQ
One and a half mole of oxygen combine with aluminium to form $Al_2O_3$, then the weight of aluminium metal used in this reaction is .............. $\mathrm{gms}$ (Atomic weight of $Al = 27$)
- A$27$
- B$81$
- C$108$
- ✓$54$
✓
Answer
Correct option: D.
$54$
d
$3$ moles of oxygen react with $108$ $g$ of $Al$
$3$ moles of oxygen react with $108$ $g$ of $Al$
$1$ moles of oxygen react with $108 / 3\, g$ of $Al$
And $0.5$ mole of oxygen react with $108 \times 0.5/ 3\, g$ of $Al$
$\mathrm{Al}=18$ $gram$
$1$ moles of oxygen react with $108 / 3\, g$ of $Al$
And $1$ mole of oxygen react with $108 \times 1/ 3\, g$ of $Al$
$\mathrm{Al}=36$ $gram$
$=18+36$
$54\,gm$
Need a full question paper?
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Explore more
Similar questions
For the below reactions :
The correct decreasing order of enthalpies of reaction for producing carbocation is
If $n$ & $l$ are principal and azimuthal quantum no. respectively then the expression for calculating the total no. of electron in any energy level is :-
→Identify total number of mono chlorinated products when $2-$ methyl pentane react with $Cl_2 /hv$?
→What are the configuration of the two chiral centre?
When Conc. $H_2SO_4$ is added to charcoal :-
→$IUPAC$ name of the below compound is :
→For the reaction
→$H _{2} F _{2( g )} \rightarrow H _{2( g )}+ F _{2( g )}$
$\Delta U =-59.6\,kJ\,mol ^{-1} \text { at } 27^{\circ}\,C$.
The enthalpy change for the above reaction is (-) $kJ mol ^{-1}$ [nearest integer] Given : $R =8.314\,JK ^{-1}\,mol ^{-1}$
The conjugate acid of $NH_2^-$ is
→Which statement is not correct for $n = 5$, $m = +3$
→The atomic weight of an element is double its atomic number. If there are four electrons in $2p$ orbital, the element is
→