Ans : 4 acidic compounds. 
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Q2. Select total number of acidic compounds out of given below.

          CsOH, OC(OH)2, SO2(OH)2, Sr(OH)2, Ca(OH)2,  Ba(OH)2, BrOH, NaOH, O2NOH 

Look carefully. CsOH is base as Cs is metal.
OC(OH)2 has no metallic group. So rearrange as H2CO3. It is carbolic acid.
SO2(OH)2 is also an acid, as there is no metallic group. It is H2SO4, sulphuric acid.
Sr(OH)2 , Ca(OH)2 and Ba(OH)2 are all bases as Sr, Ca , Ba are metals.
BrOH has no metallic group. Hence,  it is HOBr,  an acid of bromine.
O2NOH is actually HNO3 , nitric acid.
So, there are 4 acids

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