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NEET Chemistry MCQ
Boron Family Mcq Neet Chemistry
Quiz 2
Solution
Q.1.
Aluminium becomes passive in ... [MLNR 1991]
50%
a) Con HNO3
17%
b) H2CrO4
0%
c) HClO4
33%
d) All
Q.2.
Which of the following is not true about potash alum .. [ MLNR 1993]
50%
a) Its empirical formula is KAl(SO4)2 . 12H2O
21%
b) It is aqueous solution is basic in nature
7%
c) It is used in dyeing industry
21%
d) On heating it melts in its water of crystallization
Q.3.
Which is most amphoteric? [ DPMT 1982]
0%
a) Na2O
35%
b) MgO
59%
c) Al2O3
6%
d) CaO
Q.4.
Which one of the following has the lowest m.p.?
36%
a) B
7%
b) Al
36%
c) Ga
21%
d) Tl
Q.5.
The first ionization enthalpies ( kJ/mol) for Li, Be ,B and C have following values Which of these values corresponds to that of boron
23%
a) 520
38%
b) 800
8%
c) 899
31%
d) 1086
Q.6.
Al is more reactive than Fe but Al is less easily corroded than Fe because .. [ KCET 1993]
9%
a) It is a noble metal
45%
b) Oxygen form a protective oxide layer
36%
c) Iron undergoes reaction easily with water
9%
d) Fe form mono and divalent ions
Q.7.
Which of the following is most abundant in earth crust? [ BHU 1981]
8%
a) Boron
75%
b) Aluminium
8%
c) Gallium
8%
d) Thallium
Q.8.
Which of the following is a component of ruby? [ CPMT 1989]
0%
a) CaCO3
40%
b) MgCO3
20%
c) Al2O3
40%
d) Al(OH)3
Q.9.
Which of the following statement is correct? [ BHU 1994]
45%
a) BCl3 and AlCl3 are both Lewis acids and BCl3 is stronger than AlCl3
45%
b) BCl3 and AlCl3 are both Lewis acids and AlCl3 is stronger than BCl3
9%
c) BCl3 and AlCl3 are both equally strong Lewis acids
0%
d) Both BCl3 and AlCl3 are not Lewis acids
Q.10.
Which of the following is not a Lewis acid? { harayana CEET 1994]
22%
a) AlCl3
22%
b) SnCl4
11%
c) FeCl3
44%
d) AlCl3 . 6H2O
Q.11.
Which of the following is Lewis acid? [ MLNR 1994]
20%
a) PCl3
60%
b) AlCl3
20%
c) NCl3
0%
d) AsCl3
Q.12.
The metal ion M+3 loses 3 electrons. Its oxidation number will be ... [ CPMT 1999]
30%
a) +3
70%
b) +6
0%
c) 0
0%
d) -3
Q.13.
The chemical composition of cryolite mineral is ... [ MP PET 2002]
11%
a) Al2O3
33%
b) Al2O3 . 12H2O
11%
c) KAlSi3O8
44%
d) Na3AlF6
Q.14.
A particular element belongs to group13 and second period of the periodic table, it is ... [MP CET 1994]
10%
a) GAs, slightly metallic
0%
b) Liquid, non-metallic
50%
c) Solid, non-metallic
40%
d) Solid, less metallic
Q.15.
Aluminium is most abundant in earth's crust, yet it is obtained from bauxite because .. [ CPMT 1997]
0%
a) Bauxite is available in large quantity
44%
b) of easy extraction of aluminium from it
44%
c) bauxite contains maximum aluminium
11%
d) Bauxite is less impure
Q.16.
Cryolite is used in the electrolytic extraction of aluminium .. [ MP MPT 2002]
44%
a) To obtain more aluminium
11%
b) To decompose bauxite
0%
c) To protect anodes
44%
d) As reducing agent
Q.17.
Which of the following acts as an oxidising agent
11%
a) B3+
44%
b) Al3+
33%
c) Tl3+
11%
d) In+3
Q.18.
Alumina is .. [ DEC 2002]
89%
a) Amphoteric
0%
b) Acidic
0%
c) Basic
11%
d) None of these
Q.19.
AlCl3 is ? [AFMC 1995]
44%
a) Anhydrous and covalent
33%
b) Anhydrous and ionic
0%
c) Covalent and Basic
22%
d) Coordinate and acidic
Q.20.
In the commercial electrochemical process for Al extraction, the electrolyte used is .. [ IIT 1999]
12%
a) Al(OH)3 in NaOH solution
62%
b) An aqueous solution of Al2(SO4)3
0%
c) A molten mixture of Al2O3
25%
d) A molten mixture of AlO(OH) and Al(OH)3
Q.21.
Aluminium oxide is not reduced by chemical reactions since .. [ KCET 2002 ]
25%
a) Aluminium oxide is highly stable
38%
b) Aluminium oxide is reactive
12%
c) Reducing agent contaminate
25%
d) The process pollutes the environment
Q.22.
Which of the following statement is false .. [ Pb. CET 1988]
50%
a) Boron trifluoride is a strong Lewis base
12%
b) Aluminium is a good reducing agent
12%
c) Boron resembles in many properties with silicon
25%
d) Boron shows +3 oxidation state
Q.23.
AlCl3 on hydrolysis gives [DPMT 1997]
33%
a) Al2O3 . H2O
33%
b) Al(OH)3
22%
c) Al2O3
11%
d) AlCl3 . 6H2O
Q.24.
Which of the following is not a use of potash alum? [ KCET 2002]
0%
a) As A styptic in arresting bleeding
50%
b) As a pesticide
38%
c) As a mordant in dyeing
12%
d) As a coagulant for colloidal clay in water
Q.25.
In TlI3 ...
0%
a) covalent bond exists
36%
b) Contains Tl+3 and I- ions
36%
c) Tl+1 and I3-
27%
d) Coordinate bond present
Q.26.
Which is an electrophile? [ DCE 2002]
29%
a) AlCl4-
14%
b) NH3
43%
c) CH3OH
14%
d) BCl3
Q.27.
Aluminium reacts with caustic soda to form? [ MP PMT 1995]
12%
a) Sodium meta aluminate
38%
b) Aluminium hydroxide
12%
c) Sodium tetra aluminate
38%
d) Aluminium Oxide
Q.28.
Which of the following is electron deficient? [ CBSE PMT 2000]
14%
a) NH3
29%
b) BCl3
29%
c) PCl3
29%
d) None of these
Q.29.
A layer of coke is spread over bauxite during extraction of aluminium. this acts as a/an .. [ Manipal PMT 2002]
12%
a) Flux
38%
b) Slag to remove impurities
38%
c) Reducing agent
12%
d) Insulation and does not allow heat to escape
Q.30.
An example of alum is
38%
a) Al2(SO4)3 . Na2SO4 . 12H2O
0%
b) FeSO4 . (NH4)SO4 . 6H2O
50%
c) K2SO4 . Al2(SO4)3 . 24H2O
12%
d) FeSO4 . Al2(SO4)3 . 24H2 O
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