The decreasing values of bond angles from $NH_3$ $(106^o)$ to $SbH_3$ $(101^o)$ down group-$15$ of the periodic table is due to
- Adecreasing $lp-bp$ repulsion
- Bdecreasing electronegativity
- Cincreasing $bp-bp$ repulsion
- Dincreasing $p-$orbital character in $sp^3$
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Statement $I$: Upon heating a borax bead dipped in cupric sulphate in a luminous flame,the colour of the bead becomes green.
Statement $II$: The green colour observed is due to the formation of copper$(I)$ metaborate.
In the light of the above statements,choose the most appropriate answer from the options given below :
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Statement $II$: The green colour observed is due to the formation of copper$(I)$ metaborate.
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