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MCQ on poentiometry: Page-5

To measure the pH of very strong acids or bases, the secondary standards required are
Potassium tetraoxalate

(P) Potassium tetraoxalate (Q) Calcium hydroxide solutions (R) KCl(S) KOH

(A) Q,S

(B) P,R

(C) P,Q

(D) R,S

The operational definition of pH is

(A) pH test=pH std + (E std – E test)F/2.303RT

(B) pH Std=pH Test + (E std – E test)F/2.303RT

(C) pHtest=pHstd + (ETest – EStd)F/2.303RT

(D) pH test=pH std + (E std – E test)/2.303RTF

Typical pH sensitive glass membrane electrodes are made up of
Borosilicate

(A) Q,S

(B) P,R

(C) Q,R

(D) P,S

The operational definition of pH is valid for a range of

(A) 4-10

(B) 2-12

(C) 2-10

(D) 4-12

The errors in measurement of pH are significant when the ionic strength is greater than

(A) 0.1

(B) 0.5

(C) 1

(D) 5