CHEMISTRY 1-Which of the following will have maximum pH? (A) Human saliva (B) Black coffee (C) Human blood (D) Gastric juice Ans-(C) 2- F-centre is produced due to? (A)Unpaired electron occupied anionic vaccancies (B)Monovalent ion is replaced by bivalent ion (C)Ions present in cationic vaccancies (D)Disslocation of ions Ans-(A) (3)Which of the following is correct for ZnO? (A)Impart color due to change transfer (B)On heating it turns yellow (C)Zn can reduce hydrogen at room temprature (D)It sublimises on heating Ans-(B) 4-By which method we can convert ppt to colloidal solution? (A)Peptization (2)Homogenisation (C)Dispersion (D)Solvation Ans-(A) 5-Which can displace Al from Alum? (A)Mn (B)Tl (C)Sc (D)In Ans-(C) 6-Which one is wrong? (A)Pyroxene is a linear silicate (B)Zeolite is a 2 dimen...
