Daily jee practice questions 6 10 2017

Daily practice questions 1,

2,

3,

4,

5,

6,

7,

8,

Three reactions involving H2PO4­ are given below

(i) H3PO4 + H2O ® H3O+ + H2PO4­

dated :5/10/2017

(ii) H2PO4­ + H2O ® HPO42­ + H3O+ (iii) H2PO4­ + OH­ ® H3PO4 + O2­ In which of the above does H2PO4­ act as an acid?

9, Which of the following contains P ­ O ­ P bond?

A)

B)

Hypophosphorous acid

Phosphorous acid

C)

D)

Pyrophosphoric acid

Orthophosphoric acid

10 ,Four species are listed below: (i) HCO3­ (ii) H3O+ (iii) HSO4­ (iv) HSO3F Which one of the following is the correct sequence of their acidic strength?

A)

B)

iii < I < iv < ii

iv < ii < iii < i

C)

D)

ii < iii < I < iv

i < iii < ii < iv

Answer:

1,

2,

3,

4,

5, b 6, c 7, A

8, b-(ii)

9, c 10, D