MCQ
In which pair most efficient packing is present?
- A$\text{hcp}$ and $\text{bcc}.$
- ✓$\text{hcp}$ and $\text{ccp}.$
- C$\text{bcc}$ and $\text{ccp}.$
- D$\text{bcc}$ and simple cubic cell.
✓
Answer
Correct option: B.
$\text{hcp}$ and $\text{ccp}.$
In $\text{hcp}$ and $\text{ccp}$ the packing efficiency is maximum $($i.e. $74\%),$ hence this pair of packing is considered as "most efficient packing".
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
Which is not a pseudohalide ?
Find the main result in the process below.
Which of the following is not a fat soluble vitamin?
According to the electrochemical concept, corrosion occurs at:
Compound $\mathrm{A}, \mathrm{C}_{8} \mathrm{H}_{10} \mathrm{O},$ is found to react with $\mathrm{NaOI}$ (produced by reacting $Y$ with $NaOH$) and yields a yellow precipitate with characteristic smell.
→$\mathrm{A}$ and $\mathrm{Y}$ are respectively
$1-2-$ dichloro ethane $+ NaSCH_2 CH_2SNa \to C_4H_8S_2 + (P)$
→Unknown product $(P)$ of the above reaction is
Potassium ferrocyanide is a
The order of reactivity of the following alcohols towards dehydration is: 
Phenol reacts with dilute $HN{O_3}$ at normal temperature to form
→The half-life of first order reaction depends :