MCQGeeks
0 : 0 : 1
CBSE
JEE
NTSE
NEET
English
UK Quiz
Quiz
Driving Test
Practice
Games
NEET
NEET Chemistry MCQ
Nitrogen Family Mcq Neet Chemistry
Quiz 4
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
Q.1
Group 15 of the periodic table consists of the elements N, P, As, Sb and Bi. On passing from N to Bi, the oxides of the elements of general formula M2O3 becomes... [ DEC1994]
0%
a) Stronger reducing agent
0%
b) More ionic
0%
c) More basic
0%
d) More volatile
Explanation
As we go from top to bottom of group electronigativity decreases basic character increases Answer:(c)
Q.2
The sides of match box have coating of .. [ BHU 1995]
0%
a) Potassium chloride and red lead
0%
b) Potassium chlorate and antimony sulphide
0%
c) Antimony sulphide and red phosphorus
0%
d) Antimony sulphide and red lead
Explanation
Answer: (c)
Q.3
White P when boiled with strong solution of caustic soda produces.. { CPMT 1989]
0%
a) Phosphine
0%
b) Posh acid
0%
c) Phosphorous acid
0%
d) none
Explanation
Answer: (a)
Q.4
Which of the following reacts rapidly with oxygen in air at ordinary temperature
0%
a) White P
0%
b) Red P
0%
c) N2
0%
d) N2O
Explanation
Except white P others can not react with oxygen at ordinary temperature. White P gives P4P6 or P4O10 if oxygen is excess Answer: (a)
Q.5
The sequence of acidic character is .. [ CPMT 1993]
0%
a) SO2 > CO2 > CO > N2O5
0%
b) SO2 >N2O5 > CO > CO2
0%
c) N2O5 > SO2 > CO > CO2
0%
d) N2O5 > SO2 > CO2 >CO
Explanation
Acidity depends on Oxidation state and electronegativity More the oxidation state more acidic and more the electronegativity more the acidic character In N , C, and S. N have maximum electronegativity and have maximum oxidation for N2O5, where as in Co , C have oxidation tate +2 thus lest Thus correct option is 'd' Answer:(d)
Q.6
Among the following oxides, the least acidic is ... [ CBSE PMT1996]
0%
a) P4O6
0%
b) P4O10
0%
c) As4O6
0%
d) AS4O10
Explanation
In nitrogen family electro negativity decreases from top to bottom thus P compounds are more acidic than As. More the oxidation state of central atom more acidic character thus As4O6 is least acidic Answer: (c)
Q.7
When orthophosphoric acid is heated to 600°C, the product formed is ... [ CBSE PMT 1989]
0%
a) PH3
0%
b) P2O5
0%
c) H3PO3
0%
d) HPO3
Explanation
2H3PO4 → 2HPO3 + 2H2O Answer: (d)
Q.8
Amongst the following elements ( whose electronic configurations are given below), the one having the highest ionization energy is [ IIT 1990]
0%
a) Ne]3s2 3p1
0%
b) [Ne] 3s2 3p3
0%
c) [Ne] 3s23p2
0%
d) [Ar] 3d10 4s2 4p3
Explanation
in option 'b' p orbital is half filled thus highest ionization energy Answer: (b)
Q.9
Structure of white phosphorus is ... [ BHU 1994]
0%
a) Square planar
0%
b) Pyramidal
0%
c) Tetrahedral
0%
d) Trigonal planar
Explanation
Answer:(c)
Q.10
Among the following species, identify the isostructureal pairs... [ IIT 1996] NF3, NO3- , BF3 H3O+, HN3
0%
a) [NF3,NO3-] and [ BF3, H3O+]
0%
b) [NF3, HN3] and [NO3-, BF3]
0%
c) [NF3, H3O+] and [NO3-, BF3]
0%
d) [NF3, H3O+] and [HN3,BF3]
Explanation
both NF3 and H3O+ have pyramidal structures where as NO3- and BF3 both have trigonal planar structures. Answer: (c)
Q.11
Red P can be obtain form white P by .. [ KCET 1989]
0%
a) Heating it with a catalyst in an inert atmosphere
0%
b) Distilling it in an inert atmospheres
0%
c) Dissolving it an inert atmosphere
0%
d) Melting and pouring liquid in to water
Explanation
Answer: (a)
Q.12
Phosphine is produced by adding water to .. [KCET 1991]
0%
a) CaC2
0%
b) HPO3
0%
c) Ca3P2
0%
d) P4O10
Explanation
Ca3P2 + 6H2O → 3Ca(OH)2 + 2PH3 Answer: (c)
Q.13
The element with the highest first ionization potential is [ Roorkee Screening test 1993]
0%
a) Boron
0%
b) Carbon
0%
c) Nitrogen
0%
d) Oxygen
Explanation
Nitrogen have half filled p orbital thus it is more stable and have higher ionization potential Answer:(c)
Q.14
P2O5 is used extensively as a [BVP 2003]
0%
a) Reducing agent
0%
b) Oxidising agent
0%
c) Dehydrating agent
0%
d) Preservative
Explanation
Generally P2O5 are used as a dehydrating agent. Answer: (c)
Q.15
Which is not an acid salt? [ MLNR 1989]
0%
a) NaH2PO3
0%
b) NaH2PO2
0%
c) Na3HP2O6
0%
d) Na4P2O7
Explanation
Na3HP2O6 is not formed by hypophosphoric acid ( H4P2O6) it forms only Na2H2P2O6 and Na4P2O6 . Answer: (c)
Q.16
the oxidation state of phosphorus in Ba(H2PO2)2 is ... { IIT 1990]
0%
a) +3
0%
b) +2
0%
c) +1
0%
d) -1
Explanation
Ba(H2PO3)2 = +2 + ( +2 +x -4) × 2 = 0 +2+(x-2) × 2 = 0 2x - 2 = 0 x = 1 Answer: (c)
Q.17
Which of the following is amphotoric? [ Haryana CEET 1994]
0%
a) CO2
0%
b) Sb2O3
0%
c) MgO
0%
d) Mn2O3
Explanation
Out of options given Sb is metalloid thus its oxide is amphoteric Answer:(b)
Q.18
Which of the following halides is the most acidic? [ Haryana CEET 1996]
0%
a) PCl3
0%
b) SbCl3
0%
c) BiCl3
0%
d) CCl4
Explanation
p is more electronegative Answer: (a)
Q.19
When aluminium phosphide is treated with dil. sulphuric acid.. [ KCET 1989]
0%
a) SO2 is liberated
0%
b) PH3 is evolved
0%
c) H2S is evolved
0%
d) H2 is evolved
Explanation
2AlP + 3 H2SO4 → Al2(SO4)4 Answer: (b)
Q.20
P2O5 is heated with water to give .. [ CBSE PMT 1991]
0%
a) Hypophosphrous acid
0%
b) Phosphorous acid
0%
c) Hypohosphoric acid
0%
d) Orthophosphoric acid
Explanation
P2O5 + 3H2O → 2H3PO4 Answer: (d)
Q.21
Bcl3 is planar molecule where as NCl3 is pyramidal because .. [ CBSE PMT 1995]
0%
a) BCl3 ha no lone pair of electrons but NC3 has a lone pair
0%
b) B - Cl bond is more planer than N - Cl bond
0%
c) Nitrogen atom is smaller than boron atom
0%
d) N - Cl bond is more covalent than B- Cl bond
Explanation
B in BCl3 is sp2 hybridized and has no lone pair. N in NH3 is sp3 hybridized and has lone pair due to this NH3 has pyramidal structure Answer: (a)
Q.22
Phosphide ion has the electronic structure similar to that of .. [ CPMT 1988]
0%
a) Nitride ion
0%
b) Fluoride ion
0%
c) Sodium ion
0%
d) Chloride ion
Explanation
Phosphitde ion is P3- have number of electrons 15+3 = 18 Cl- have 17+1 = 18 electrons so P3- and Cl- are iso-electric Answer: (d)
Q.23
There is very little difference in acid strength in the series H3PO4, H3PO3 and H3PO2 because
0%
a) Phosphorus in these acid exists in different oxidation states
0%
b) Number of unprotonated oxygen responsible for increase of acidity due to inductive effect remains the same
0%
c) Phosphorus is not a highly electronegative element
0%
d) Phosphorus oxides are less electronegative element
Explanation
All given acids contains only one double bonded oxygen with P which is responsible for acidity due to inductive effect. there fore very less difference in acid strength Answer: (b)
Q.24
Constitution of superphosphate is .. [ COPMT1993]
0%
a) Gypsum and calcium dihydrogen phosphate
0%
b) Gypsum and calcium phosphate
0%
c) Gypsum and H3P4
0%
d) Calcium phosphate and H3PO4
Explanation
Supoer phosphate is Ca(H2PO4)2 + CaSO4 . 2H2O Answer:(a)
Q.25
In the P3-, S2- and Cl- ions the increasing order of size is ... [ AIIMS 1996]
0%
a) Cl- < S2- < P3-
0%
b) P3- < S2- < Cl-
0%
c) S2- < Cl- < P3-
0%
d) S2- < P3- < Cl-
Explanation
P3-, S2- and Cl- are isoelectronic species. their sizes increases as the nuclear charge decreases from Cl to P Answer: (a)
Q.26
Which of the following oxides will be least acidic? [ MP PMT 1990]
0%
a) P4O6
0%
b) P4O10
0%
c) As2O6
0%
d) As4O10
Explanation
Higher the electro negativity higher the acidic character, Higher the oxidation state more the acidity, Thus P is more acidic than As Oxidation state of As in As4O10 in is +5 Oxidation sate of As in As2O6 is +3 Answer: (c)
Q.27
CN- ion and N2 are isoelectronic but in contrast to CN-, N2 is chemically inert because ... [ IIT1992]
0%
a) Low bond energy
0%
b) Absence of bond polarity
0%
c) Unsymmetrical electron distribution
0%
d) Presence of more number of electrons in bonding orbitals
Explanation
In N2 pure covalent bond exists between equally electronegative n. Thus there is no bond polarity. In case of CN- both elements have different electronegativity. Thus have polar bonds Answer: (b)
Q.28
By action of hot conc. H2SO4, phosphorus changes to [ Roorkee Screening test 1992]
0%
a) Phosphorous acid
0%
b) Orthophosphoric acid
0%
c) Metaphosphoric acid
0%
d) Pyrophosphoric acid
Explanation
P4 + 10 H2SO4 → 4H3 PO4 + 10SO2 + 4H2O Answer:(b)
Q.29
The most acidic of the following compounds is .. [ Bihar CEE 1995]
0%
a) P2O3
0%
b) Sb2O3
0%
c) B2O3
0%
d) As2O3
Explanation
Ou of P, Sb, B and As , most electronegative is P thus option (a) is more acidic Answer: (a)
Q.30
Which of the following is an oxyacid?
0%
a) Ba(OH)2
0%
b) Mg(OH)2
0%
c) H3PO3
0%
d) HCl
Explanation
option 'c' is oxo acid of phsphorous Answer: (c)
0 h : 0 m : 1 s
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
Report Question
×
What's an issue?
Question is wrong
Answer is wrong
Other Reason
Want to elaborate a bit more? (optional)
Support mcqgeeks.com by disabling your adblocker.
×
Please disable the adBlock and continue.
Thank you.
Reload page