p block

Question 1

meta form / pyro form made by removing

Answer 1

H2O

Question 2

hypo form is made by removing

Answer 2

oxygen

Question 3

phosphinic acid

Answer 3

hypo phosphorus acid h3po2

Question 4

phosphonic acid

Answer 4

ortho phosphorus acid h3po3

Question 5

ortho means

Answer 5

normal ex h3po3 / h3po4

Question 6

Xe03 IS PREPARED FROM HYDROLYSIS OF

Answer 6

XeF4 Xe F 6

Question 7

Match the formulas of oxides given in Column I with the type of oxide given in
Column II and mark the correct option.
Column I Column II
(A) Pb3O4

(1) Neutral oxide
(B) N2O (2) Acidic oxide
(C) Mn2O7

(3) Basic oxide

(D) Bi2O3

(4) Mixed oxide

Code :

(i) A (1) B (2) C (3) D (4)
(ii) A (4) B (1) C (2) D (3)
(iii) A (3) B (2) C (4) D (1)
(iv) A (4) B (3) C (1) D (2)

Answer 7

B

Question 8

In a cyclotrimetaphosphoric acid molecule, how many single and double
bonds are present?
(i) 3 double bonds; 9 single bonds
(ii) 6 double bonds; 6 single bonds
(iii) 3 double bonds; 12 single bonds
(iv) Zero double bonds; 12 single bonds

Answer 8

1

Question 9

12. Which of the following elements does not show allotropy?
    (i) Nitrogen
    (ii) Bismuth
    (iii) Antimony
    (iv) Arsenic

Answer 9

1

Question 10

Which of the following statements is wrong?
(i) Single N–N bond is stronger than the single P–P bond.
(ii) PH3
can act as a ligand in the formation of coordination compound
with transition elements.
(iii) NO2
is paramagnetic in nature.
(iv) Covalency of nitrogen in N2O5
is four.

Answer 10

1

Question 11

Elements of group-15 form compounds in +5 oxidation state. However,
bismuth forms only one well characterised compound in +5 oxidation state.
The compound is
(i) Bi2O5
(ii) BiF5
(iii) BiCl5
(iv) Bi2
S5

Answer 11

2

Question 12

In the preparation of HNO3

, we get NO gas by catalytic oxidation of ammonia.

The moles of NO produced by the oxidation of two moles of NH3

will be ______.

(i) 2
(ii) 3
(iii) 4
(iv) 6

Answer 12

the preparation of HNO 3, we get NO gas by catalytic oxidation of ammonia. The moles of NO produced by the oxidation of two moles of NH 3 will be 2

Question 13

A black compound of manganese reacts with a halogen acid to give greenish
yellow gas. When excess of this gas reacts with NH3

an unstable trihalide is

formed. In this process the oxidation state of nitrogen changes from _________.
(i) – 3 to +3
(ii) – 3 to 0
(iii) – 3 to +5
(iv) 0 to – 3

Answer 13

MNO2 + NACL + H2SO4 = MNCL2 + CL2 +NAHSO4 NH3 + CL2 = NCL3

Question 14

34. Which of the following orders are correct as per the properties mentioned against
each?
(i) As2O3
< SiO2
< P2O3
< SO2

Acid strength.

(ii) AsH3
< PH3
< NH3 Enthalpy of vapourisation.

(iii) S < O < Cl < F More negative electron gain enthalpy.
(iv) H2O > H2S > H2Se > H2

Te Thermal stability.

Answer 14

1 2

Question 15

36. In which of the following reactions conc. H2
    SO4
    is used as an oxidising reagent?

(i) CaF2
+ H2
SO4 → CaSO4
+ 2HF

(ii) 2HI + H2SO4 → I2
\+ SO2
\+ 2H2O
(iii) Cu + 2H2SO4 → CuSO4
\+ SO2
\+ 2H2O

(iv) NaCl + H2SO4 → NaHSO4
+ HCl

Answer 15

2 3

Question 16

back bonding effect on

Answer 16

acidic nature & h bond strength

Question 17

back bonding ^

Answer 17

acidic nature & h bond strength ^

Question 18

hydrolysis

Answer 18

+ charge ^ /polarising power ^ /covalent nature ^/ presence of vacent orbital ^

Question 19

NA CL , Mg cl2 . alcl3 , hydrolysis order

Answer 19

+ charge ^ «<

Question 20

licl ,Becl2, bCl3,CCL4 hydrolysis order

Answer 20

ccl4 ( no vacent orbital ) licl < becl2< bcl3

Question 21

down the period hydrolysis

Question 22

down the group hydrolysis

Answer 22

decrease ionic nature ^