MCQ
“$925$ fine silver” means an alloy of :
- A$7.5 \% \,Ag$ and $92.5\% \ Cu$
- ✓$92.5 \% \, Ag$ and $7.5 \% \, Cu$
- C$80 \% \,Ag$ and $20 \% \, Cu$
- D$90 \% \,Ag$ and $10 \% \,Cu$
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Consider the following statements about borax :
$a.$ Each boron atom has four $B-O$ bonds
$b.$ Each boron atom has three $B-O$ bonds
$c.$ Two boron atoms have four $B-O$ bonds while other two have three $B-O$ bonds
$d.$ Each boron atom has one $-OH$ groups
Select correct statement(s) :
$\begin{array}{*{20}{c}}
{C{H_3}C{H_2} - N - C{H_2}C{H_3}} \\
{|\,} \\
{C{H_3}}
\end{array}$
is :

