Acid ashes and salts

21.The P°H° of fresh milk is pH₆, when it turns sour, its P°H° (pH)
 
A. < 6 will be
 
B. remains the same i.e. 6
 
C. > gets 6
 
D. becomes indifferent i.e. 7
 
Option”A” is correct
22.P ° H ° (pH) shows
 
A. Chemical used in making photographs from negative
 
B. value of acidity or alkalinity of a solution
 
C. earthquake intensity rating
 
D. evaluation of purity of milk
 
Option”B” is correct
23.Aqueous solution of ammonium chloride is
 
A. acidic
 
B. alkaline
 
C. Moody
 
D. Colorful
 
Option”B” is correct
24.Solutions in test tubes containing H₂O and aqueous NaOH can be distinguished from –
 
A. by red litmus
 
B. by blue litmus
 
C. Na₂CO₃
 
D. by aqueous HCI
 
Option”A” is correct
25.Which of the following is an acidic salt?
 
A. HCIO
 
B. AgBr
 
C. HFN
 
D. HCO₃
 
Option”D” is correct
26.Aqueous solution of which of the following salts turns red litmus blue?
 
A. Na₂CO₃
 
B. NaHCO₃
 
C. Na₂CO₃ ,10H₂O
 
D. all of the above
 
Option”A” is correct
27.Which instrument is used to test the acidity of an aqueous solution?
 
A. hygrometer
 
B. acidometer
 
C. Ph meter
 
D. ammeter
 
Option”C” is correct
28.Which of the following compound is not a Lewis acid?
 
A. HERE₃
 
B. BF₃
 
C. NH₃
 
D. FeCI₃
 
Option”B” is correct
29.The pH value of pure water is
 
A. 0
 
B. 1
 
C. 7
 
D. 14
 
Option”C” is correct
30.acid is a substance that
 
A. accepts electrons
 
B. provides electrons
 
C. gives proton
 
D. gives OH ion
 
Option”C” is correct