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Quiz 2
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Q.1
Aluminium becomes passive in ... [MLNR 1991]
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a) Con HNO3
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b) H2CrO4
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c) HClO4
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d) All
Explanation
All,a acid are strong oxidizing agents thus these acids will form a thin layer of Aluminium oxide and render it passive Answer:(d)
Q.2
Which of the following is not true about potash alum .. [ MLNR 1993]
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a) Its empirical formula is KAl(SO4)2 . 12H2O
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b) It is aqueous solution is basic in nature
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c) It is used in dyeing industry
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d) On heating it melts in its water of crystallization
Explanation
It aqueous solution is acidic in nature Answer: (b)
Q.3
Which is most amphoteric? [ DPMT 1982]
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a) Na2O
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b) MgO
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c) Al2O3
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d) CaO
Explanation
Answer: (c)
Q.4
Which one of the following has the lowest m.p.?
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a) B
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b) Al
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c) Ga
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d) Tl
Explanation
Answer: (c)
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
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a) 520
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b) 800
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c) 899
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d) 1086
Explanation
Answer:(b)
Q.6
Al is more reactive than Fe but Al is less easily corroded than Fe because .. [ KCET 1993]
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a) It is a noble metal
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b) Oxygen form a protective oxide layer
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c) Iron undergoes reaction easily with water
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d) Fe form mono and divalent ions
Explanation
Answer: (b)
Q.7
Which of the following is most abundant in earth crust? [ BHU 1981]
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a) Boron
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b) Aluminium
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c) Gallium
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d) Thallium
Explanation
Answer: (b)
Q.8
Which of the following is a component of ruby? [ CPMT 1989]
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a) CaCO3
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b) MgCO3
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c) Al2O3
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d) Al(OH)3
Explanation
composition of ruby is Al2O3 and Cr2O3 a red stone Answer: (c)
Q.9
Which of the following statement is correct? [ BHU 1994]
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a) BCl3 and AlCl3 are both Lewis acids and BCl3 is stronger than AlCl3
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b) BCl3 and AlCl3 are both Lewis acids and AlCl3 is stronger than BCl3
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c) BCl3 and AlCl3 are both equally strong Lewis acids
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d) Both BCl3 and AlCl3 are not Lewis acids
Explanation
Size of Al and Cl p orbitals are nearly same same thus there is proper shearing of electrons In case of B and Cl there is large difference in size of 2p and 3p orbitlas hence sharing is less effective thus BCl3 acts as strong Lewis acid than AlCl3 Answer:(a)
Q.10
Which of the following is not a Lewis acid? { harayana CEET 1994]
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a) AlCl3
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b) SnCl4
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c) FeCl3
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d) AlCl3 . 6H2O
Explanation
Since Al have accommodate six electron pairs in D orbitals and there is no vacant orbital to accept electron thus AlCl3 . 6H2O will not act as Lewis acid Answer: (d)
Q.11
Which of the following is Lewis acid? [ MLNR 1994]
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a) PCl3
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b) AlCl3
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c) NCl3
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d) AsCl3
Explanation
Answer: (b)
Q.12
The metal ion M+3 loses 3 electrons. Its oxidation number will be ... [ CPMT 1999]
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a) +3
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b) +6
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c) 0
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d) -3
Explanation
Answer: (b)
Q.13
The chemical composition of cryolite mineral is ... [ MP PET 2002]
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a) Al2O3
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b) Al2O3 . 12H2O
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c) KAlSi3O8
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d) Na3AlF6
Explanation
Answer:(d)
Q.14
A particular element belongs to group13 and second period of the periodic table, it is ... [MP CET 1994]
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a) GAs, slightly metallic
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b) Liquid, non-metallic
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c) Solid, non-metallic
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d) Solid, less metallic
Explanation
Group 13 second period element id Boron is non-metal and solid at room temperature Answer: (c)
Q.15
Aluminium is most abundant in earth's crust, yet it is obtained from bauxite because .. [ CPMT 1997]
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a) Bauxite is available in large quantity
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b) of easy extraction of aluminium from it
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c) bauxite contains maximum aluminium
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d) Bauxite is less impure
Explanation
Answer: (a)
Q.16
Cryolite is used in the electrolytic extraction of aluminium .. [ MP MPT 2002]
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a) To obtain more aluminium
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b) To decompose bauxite
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c) To protect anodes
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d) As reducing agent
Explanation
Answer: (b)
Q.17
Which of the following acts as an oxidising agent
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a) B3+
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b) Al3+
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c) Tl3+
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d) In+3
Explanation
Due to inert pair effect Tl+3 is unstable thus by accepting electrons it reduce to Ti1+ thus it is strong oxidizing agent Answer:(c)
Q.18
Alumina is .. [ DEC 2002]
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a) Amphoteric
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b) Acidic
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c) Basic
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d) None of these
Explanation
Answer: (a)
Q.19
AlCl3 is ? [AFMC 1995]
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a) Anhydrous and covalent
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b) Anhydrous and ionic
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c) Covalent and Basic
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d) Coordinate and acidic
Explanation
Answer: (a)
Q.20
In the commercial electrochemical process for Al extraction, the electrolyte used is .. [ IIT 1999]
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a) Al(OH)3 in NaOH solution
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b) An aqueous solution of Al2(SO4)3
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c) A molten mixture of Al2O3
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d) A molten mixture of AlO(OH) and Al(OH)3
Explanation
Answer: (c)
Q.21
Aluminium oxide is not reduced by chemical reactions since .. [ KCET 2002 ]
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a) Aluminium oxide is highly stable
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b) Aluminium oxide is reactive
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c) Reducing agent contaminate
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d) The process pollutes the environment
Explanation
Al have strong affinity for Oxygen hence Al2O3 is highly stable Answer:(a)
Q.22
Which of the following statement is false .. [ Pb. CET 1988]
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a) Boron trifluoride is a strong Lewis base
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b) Aluminium is a good reducing agent
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c) Boron resembles in many properties with silicon
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d) Boron shows +3 oxidation state
Explanation
Boron trifluoride is a weak Lewis acid Answer: (a)
Q.23
AlCl3 on hydrolysis gives [DPMT 1997]
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a) Al2O3 . H2O
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b) Al(OH)3
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c) Al2O3
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d) AlCl3 . 6H2O
Explanation
Answer: (b)
Q.24
Which of the following is not a use of potash alum? [ KCET 2002]
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a) As A styptic in arresting bleeding
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b) As a pesticide
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c) As a mordant in dyeing
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d) As a coagulant for colloidal clay in water
Explanation
Answer: (b)
Q.25
In TlI3 ...
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a) covalent bond exists
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b) Contains Tl+3 and I- ions
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c) Tl+1 and I3-
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d) Coordinate bond present
Explanation
Answer:(c)
Q.26
Which is an electrophile? [ DCE 2002]
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a) AlCl4-
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b) NH3
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c) CH3OH
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d) BCl3
Explanation
From given options BCl3 is electron deficient species hence act as electrophile Answer: (d)
Q.27
Aluminium reacts with caustic soda to form? [ MP PMT 1995]
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a) Sodium meta aluminate
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b) Aluminium hydroxide
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c) Sodium tetra aluminate
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d) Aluminium Oxide
Explanation
2Al + 2NaOH → 2NaAlO2 +2H2 Answer: (a)
Q.28
Which of the following is electron deficient? [ CBSE PMT 2000]
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a) NH3
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b) BCl3
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c) PCl3
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d) None of these
Explanation
B in BCl3 have six electrons , still 2 electrons short Answer: (b)
Q.29
A layer of coke is spread over bauxite during extraction of aluminium. this acts as a/an .. [ Manipal PMT 2002]
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a) Flux
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b) Slag to remove impurities
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c) Reducing agent
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d) Insulation and does not allow heat to escape
Explanation
Answer:(d)
Q.30
An example of alum is
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a) Al2(SO4)3 . Na2SO4 . 12H2O
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b) FeSO4 . (NH4)SO4 . 6H2O
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c) K2SO4 . Al2(SO4)3 . 24H2O
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d) FeSO4 . Al2(SO4)3 . 24H2 O
Explanation
Pure Alum have formula M2SO4 . M'2 (SO4)3 . 24H2O Where M = monovalent metal, M' = trivalent metal Answer: (c)
0 h : 0 m : 1 s
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