Dr Dalal Chemistry for Class 9. We covered all the Dr Dalal Chemistry for Class 9 in this post for free so that you can practice well for the exam.
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Dr Dalal Chemistry for Class 9 Objective for Students
NH4OH is a weak base, but it still becomes weak with the addition of
(A) 0.2 M CH3COONa
(B) 0.2 M CH3COONH4
(C) 0.2 M H₂SO4
(D) 0.2 M NH4Cl
Option d – 0.2 M NH4Cl
In addition to a small quantity of strong acid the pH of the buffer solution
(A) Decreases
(B) Increases
(C) Remains constant
(D) Does not change considerably
Option d – Does not change considerably
20 ml of HCl solution neutralizes by 40 ml of 0.05 M KOH solution. The pH of HCI is
(A) 1
(B) 1.5
(C) 0.1
(D) 2
Option a – 1
Which of the following is a Bronsted acid but not a Bronsted base?
(A) H₂S
(B) HCO3
(C) H₂O
(D) NH3
Option a – H₂S
Ostwald’s dilution formula is applicable for
(A) Weak electrolytes
(B) Strong electrolytes
(C) Both ‘A’ and ‘B’
(D) Only for weak salt
Option a – Weak electrolytes
The salt which undergoes anion hydrolysis is
(A) CuSO4
(B) FeCl3
(C) NH4Cl
(D) Na2CO3
Option d – Na2CO3
On addition of sodium cyanide in water
(A) pH increases
(B) pH decreases
(C) pH = constant
(D) pH becomes zero
Option a – pH increases
We covered all the dr dalal chemistry for class 9 above in this post for free so that you can practice well for the exam.
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