p-Block Elements  MCQs

MCQs of p-Block Elements

Showing 21 to 30 out of 173 Questions
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21.
Which is suitable condition for "Indsutrially ammonia gas is manufactured by Haber's Process".
(a) 210 bar pressure, 773 K, [FeO]
(b) 230 bar pressure, 770 K, [Fe3O4]
(c) 200 bar pressure, 773 K, [FeO]
(d) 230 bar pressure, 770 K, [Fe2O3]
Answer:

Option (c)

22.
Bond angle is NH3 is 107.8º whereas the bond angle in SbH3 is 101º although Sb belongs to the same group as N. What is the reason ?
(a) Due to increase in repulsion between pπ-pπ.
(b) Due to increase in the characteristic of p-orbital in sp3.
(c) Due to decrease in repulsion between non-bonding pairs of electrons.
(d) Due to decreasing electronegativity.
Answer:

Option (d)

23.
Give shape, bond length and bond angle in ammonia molecule respectively.
(a) Linear, 101.5 pm, 104.5º
(b) Planar, 101.1 pm, 105.8º
(c) Tirgonal, 102.7 pm, 103.8º
(d) Trigonal pyramidal, 101.7 pm, 107.8º
Answer:

Option (d)

24.
What is used as a promoter in the manufacture of ammonia by Haber process ?
(a) KO2, Al2O3
(b) K2O, Al(OH)3
(c) KO2, Al(OH)3
(d) K2O, Al2O3
Answer:

Option (d)

25.
Which of the following is strongest proton accepter ?
(a) H2S
(b) NH3
(c) PH3
(d) H2O
Answer:

Option (b)

26.
Which of the following pairs is used as promoter in the manufacture of NH3 ?
(a) FeO and Fe
(b) KCl and AlCl3
(c) K2O and Al2O3
(d) KCl and FeCl3
Answer:

Option (c)

27.
What is the use of ammonia gas ?
(a) In the preparation of fertilizers like urea.
(b) As a coolant (refrigerant).
(c) In the preparation of HNO3.
(d) All of the above.
Answer:

Option (d)

28.
Which catalyst is used in Ostwald's method ?
(a) Pt (20%) + Rh (80%)
(b) Pt (80%) + Rh (20%)
(c) Pt (10%) + Rh (90%)
(d) Pt (90%) + Rh (10%)
Answer:

Option (d)

29.
What ions are given by HNO3 in its aqueous solution ?
(a) NO3-, H3O+
(b) N2O5+, H2O-
(c) NO2+, N3O+
(d) NO2-, H-
Answer:

Option (a)

30.
What is the product when HNO3 oxidizes phosphorus ?
(a) H3PO4
(b) H3PO3
(c) H3PO2
(d) H4P2O7
Answer:

Option (a)

Showing 21 to 30 out of 173 Questions
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