MCQ
Which statement is wrong ?
- ABeryl is an example of cyclic silicate.
- B$Mg_2SiO_4$ is orthosilicate.
- CBasic structural unit in silicates is the $SiO_4$ tetrahedron.
- ✓Feldspars are not aluminosilicates.
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The number of following statements which is/are correct about phenolphthalein is $.....$.
$A$. It can be used as an indicator for the titration of weak acid with weak base.
$B$. It begins to change colour at $pH =8.4$
$C$. It is a weak organic base
$D$. It is colourless in acidic medium