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Q57) Mark the oxide which are amphoteric in character [ MP PMT 2000]




SOLUTION


Answer: (c)


Q58) Quartz is a /an .. [ DPMT 2002]




SOLUTION


Answer: (d)


Q59) Select incorrect statement



SOLUTION

Four exigent atoms are shared basic unit is (SiO3)n
Answer:(d)



Q60) Percentage of lead in lead pencil is .... [ DPMT 1999]



SOLUTION

lead pencil contain graphite
Answer: (a)


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