p-Block Elements  MCQs

MCQs of p-Block Elements

Showing 31 to 40 out of 173 Questions
1 2 3 4 5 6
31.
Which of the following uses is not appropriate for nitric acid ?
(a) In the fertilizers like ammonium nitrate.
(b) In the explosives like TNT (Trinitrotoluene).
(c) As a coolant / refrigerant in refrigerators.
(d) As an oxidizer in the rocket fuel.
Answer:

Option (c)

32.
By heating which of the following, is NO2 not obtained ?

OR

Which of the following is not heated to get NO2 ?

(a) KNO3
(b) Pb(NO3)2
(c) Cu(NO3)2
(d) AgNO3
Answer:

Option (a)

33.
State the correct order of acidity for the oxides of nitrogen.
(a) N2O5 < N2O3 < NO2 < NO < N2O
(b) N2O5 < NO2 < N2O3 < NO < N2O
(c) N2O < NO < N2O3 < NO2 < N2O5
(d) NO < N2O < N2O3 < NO2 < N2O5
Answer:

Option (c)

34.
(a) Zn + conc. HNO3 → Zn(NO3)2 + X + H2O

(b) Zn + dil. HNO3 → Zn(NO3)2 + Y + H2O

In the above (a) and (b) reactions, which compounds will be obtained as X and Y. (or simply, identify X and Y in the above reactions.) [Reactions are not balanced]

(a) NO2 and NO
(b) NO2 and NO2
(c) NO and NO2
(d) NO2 and NH4NO3
Answer:

Option (a)

35.
Which gas is obtained by reacting calcium phosphide with water ?
(a) Arsine
(b) Nitric oxide
(c) Phosphine
(d) Ammonia
Answer:

Option (c)

36.
What is not correct for white phosphorus ?
(a) It glows in dark.
(b) It is heated at 803 K to obtain α-black phosphorus.
(c) It is insoluble in water.
(d) It is heated under pressure at 473 K to obtain β-black phosphorus
Answer:

Option (b)

37.
State the value of P-P-P bond angle in white phosphorus.
(a) 60º
(b) 90º
(c) 109º 28'
(d) 180º
Answer:

Option (a)

38.
Molecular formula of trimeta phosphoric acid and diphosphoric acid respectively is _____ and _____ .
(a) H5P3O10, H3PO2
(b) H5P3O10, H4P2O7
(c) H3PO3, H4P2O7
(d) HPO3, H4P2O7
Answer:

Option (b)

39.
Which of the following is not a use of phosphine ?
(a) In smoke screen.
(b) In Holme's signal.
(c) In combusting a gas in water
(d) To provide inert atmosphere.
Answer:

Option (d)

40.
Which of the following is used in Holme's signal ?
(a) NH3
(b) H3PO4
(c) PH3
(d) HNO3
Answer:

Option (c)

Showing 31 to 40 out of 173 Questions
1 2 3 4 5 6