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Quiz 1
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Q.1
The correct order of atomic radii in group 13 elements is [ NEET 2018]
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a) B < Ga < Al < Tl < In
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b) B < Al < Ga < In < Tl
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c) B < Al < In < Ga < Tl
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d) B < Ga < Al < In < Tl
Explanation
Answer: (d)
Q.2
The purification method of bauxite containing iron oxide as impurity is known as .. [ Kerala PMT 1998]
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a) Hoop's method
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b) Baeyer's process
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c) Electrolytic process
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d) Electrolytic process
Explanation
Answer: (b)
Q.3
An example of double salt is .. [ CBSE PMT 1989]
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a) Bleaching powder
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b) K4[Fe(CN)6]
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c) Hypo
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d) Potash alum
Explanation
Potash Alum K2SO4 . Al2(SO4)3 . 24 H2O is a double salt Answer:(d)
Q.4
Which is true for an element R present in group 13 of period table
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a) It is a gas at room temperature
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b) It has oxidation state of +4
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c) It form R2O3
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d) It forms RX2
Explanation
Answer: (c)
Q.5
Chief ore of aluminium is .. {CPMT 1989]
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a) Cryolite
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b) Feldspar
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c) Koline
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d) Bauxite
Explanation
Answer: (d)
Q.6
Which of the following mineral does not contain Al/ [ CPMT 1989]
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a) Cryolite
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b) Mica
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c) Feldspar
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d) Fluorspar
Explanation
Fluorspar is CaF2 Answer: (d)
Q.7
Which member of group 13 does not exhibit the group valency in its compounds.. { Pb sample papers 1991]
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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
Due to inert pair effect Thallium do not show group valency of +3 in its compound. It shows +1 oxidation state in its stable compounds Answer:(d)
Q.8
Which one of the following is a correct statement? [ MP CEE 1193]
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a) Al is more acidic than that of B
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b) B is basic while that of Al is amphoteric
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c) B is acidic while that of Al is amphoteric
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d) A and Al are amphoteric
Explanation
Answer: (c)
Q.9
In the aluminino-thermite process, Al acts as a/an... [ IIT 1983]
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a) Flux
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b) Oxidising agent
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c) Reducing agent
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d) Solder
Explanation
Al take out oxygen from Fe2O3 Answer: (c)
Q.10
Which of the following reaction ill not give an anhydrous AlCl3 .. [ kerla PMT 1998]
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a) By heating AlCl3 . 6H2O
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b) By passing dry HCl on heated aluminium powder
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c) By passing dry chlorine on heated aluminium powder
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d) By passing dry chlorine over heated mixture of coke and alumina
Explanation
On heating AlCl3 . 6H2O hydrolysis takes place to produce Al(OH)3 and HCl and on further heating Al(OH)3 converts to Al2O3 Answer: (a)
Q.11
The chemical formula of bauxite is [ Pb CET 1990]
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a) Al2O3
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b) Al2O3 . nH2O
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c) Na3AlF4
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d) Al2CL6
Explanation
Bauxite is an ore of the mineral called Alumina( Al2O3) which can be used to extract aluminium. So bauxite is group of hydrated aluminum oxides, Al(OH)3 with possible additional Al and (OH) so it can be written as Al2O3.nH2O where n represents that it can have different number of water molecules per Alumina based on concentration of mineral in the ore on an average. Answer:(b)
Q.12
An example of alum is .. [ Haryana CEET 1991]
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a) Al2(SO4)3 . Na2SO4 . 12H2O
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b) FeSO4 . (NH4)2SO4 . 6H2O
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c) K2SO4 . Al2(SO4)3 . 24H2O
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d) FeSO4 . Al2(SO4)3 . 24H2O
Explanation
Answer: (c)
Q.13
Duraluminium is an alloy of .. [ CPMT 1986]
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a) Al and Mg
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b) Al, Mg and Ni
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c) Al, Mg, Mn and Cu
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d) Al and Ni
Explanation
Answer: (c)
Q.14
Thallium shows different oxidation states because .. [ CPMT 1988]
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a) It is transition element
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b) Of inert pair effect
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c) Of its amphoteric character
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d) Of its higher reactivity
Explanation
Thallium shows +1 and +3 oxidation state because of inert pair effect Inert pair effect is a term often used to describe valence electrons in an s orbital penetrating to the nucleus better than electrons in p orbitals making them more tightly bound to the nucleus due to poor shielding effect offered by the inner sub-shells/orbitals and causing bonds involving these electrons to become unfavorable due to the large promotion energy involved. Answer: (b)
Q.15
Inert pair effect plays an important role in case of ... [Pb CET 1991]
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a) F
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b) Al
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c) Si
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d) Tl
Explanation
Tl is heaviest among group 13 elements thus inert pair effect is maximum Answer:(d)
Q.16
Aluminium vessels should not be washed with materials containing washing soda since .. { KCET 1993]
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a) washing soda is expensive
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b) washing soda is easily decomposed
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c) Washing soda reacts with Al to form insoluble aluminium Oxide
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d) Washing soda reacts with Al to form soluble aluminate
Explanation
2Al + Na2CO3 + 3H2O → 2NaAlO2 + CO2 + 3H2 2NaAlO2 is sodium aluminate which is soluble in water Answer: (d)
Q.17
Aluminothermy used for on the spot welding of large iron structure is based upon the fact that .. [ Pb CET 1988]
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a) As compared to iron, aluminium has greater affinity for oxygen
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b) As compared to aluminium, iron has greater affinity for oxygen
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c) Reaction between aluminium and oxygen is endothermic
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d) Reaction between iron and oxygen is endothermic
Explanation
Answer: (a)
Q.18
Anhydrous AlCl3 is prepared from .. [ MP PMT 1998]
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a) Conc. HCl and aluminium metal
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b) Aluminium and Cl2
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c) Dry HCl gas and heated aluminium metal
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d) Dilute HCl and Aluminium metal
Explanation
Answer: (c)
Q.19
Alum is not used ... [ CPMT 1992]
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a) As mordant in dyeing
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b) As insecticide
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c) In purification of water
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d) In tanning of leather
Explanation
Answer:(b)
Q.20
In the electrolysis of aluminium, cryolite is added to ... [ IIT 1986]
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a) Lower the melting point of aluminia
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b) Increases the electrical conductivity
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c) Minimise anodic effect
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d) both (a) and (b)
Explanation
Answer: (d)
Q.21
Hydrogen will not reduce .. [ IIT 1985]
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a) Heated cupric oxide
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b) Heated ferric oxide
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c) Heated stanic oxide
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d) Heated Aluminium Oxide
Explanation
Hydrogen is less electropositive than Al, it will not reduce Al2O3 Answer: (d)
Q.22
Which of the following processes does not involved a catalyst?
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a) Haber's process
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b) Thermite process
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c) Ostwald process
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d) Contact process
Explanation
Answer: (b)
Q.23
In which of the following elements +1 oxidation state is more stable than +3 ... [ EAMCET 1991]
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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
Due to inert pair effect oxidation state +1 is more stable than +3 Answer:(d)
Q.24
In thermite welding process we use [ MP CET 1993]
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a) Al powder
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b) Fe powder
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c) Ca powder
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d) Al + Fe mixture
Explanation
Thermit welding is a chemical welding process in which an exothermic chemical reaction is used to supply the essential heat energy. That reaction involves the burning of Thermit, which is a mixture of fine aluminum powder and iron oxide in the ratio of about 1:3 by weight. Answer: (d)
Q.25
Which metal is protected by a layer of its own oxide? [ DPMT 1983]
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a) Al
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b) Ag
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c) Au
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d) Fe
Explanation
Answer: (a)
Q.26
Which of the following statements is not true both for B and Al? [ Pb CET sample paper 1988]
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a) They burn in oxygen to give oxide at high temperature
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b) Their halides are Lewis acids
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c) They combine with nitrogen to form nitrides
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d) They react with HCl to form chlorides
Explanation
Boron does not reacts with HCl, but Al do Answer: (d)
Q.27
Al2O3 formation involves evolution of a large quantity of heat which makes its use in ... [ MPPMT 1990]
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a) Deoxidiser
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b) Confectionary
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c) Indoor photography
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d) Thermite welding
Explanation
Answer:(d)
Q.28
Which is used in high temperature thermometry? [ MP PMT 1993]
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a) Na
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b) Ga
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c) Tl
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d) Hg
Explanation
Ga remains liquid over a temperature range of 300 K to 2500 K) Answer: (b)
Q.29
Thermite is a mixture of ... [ IIT 1983]
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a) 3 parts of powder Al and 1 part of Fe2O3
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b)1 parts of powder Al and 3 part of Fe2O3
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c) 1 parts of powder Al and 1 part of Fe2O3
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d)2 parts of powder Al and 1 part of Fe2O3
Explanation
Answer: (b)
Q.30
Which one of the following is strongest Lewis acid? [ CPMT 1989]
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a) BF3
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b) BCl3
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c) BBr3
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d) BI3
Explanation
When size of halide increases size of p orbital increases, the tendency of donating electrons to empty p orbital of B decreases thus acidity increases Answer: (d)
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