{:("Column I (Defect)", " Column II (Effect)"),("(A) Schottky defect", "(p) Crystal becomes coloured"),("(B) Doping silicon with aluminium" , "(q) n-type semiconductor is formed"),("(C) Doping silicon with arsenic" , "(r) p-type semiconductor is formed "),( "(D) Heating NaCl crystal in presence of sodium vapour" , (s) "Density of the crystal decreases"):}

{:("Column I (Defect)", " Column II (Effect)"),("(A) Schottky defect",

1.	{:("Column I (Defect)", " Column II (Effect)"),("(A) Schottky defect", "(p) Crystal becomes coloured"),("(B) Doping silicon with aluminium" , "(q) n-type semiconductor is formed"),("(C) Doping silicon with arsenic" , "(r) p-type semiconductor is formed "),( "(D) Heating NaCl crystal in presence of sodium vapour" , (s) "Density of the crystal decreases"):}
Answer» A-s, B-q, C-r, D-p A-q,B-p, C-r, D-s A-q,B-s,C-q,D-p A-s, B-r, C-q, D-p Answer :b