Q1.
Which one of the following is most abundant in the earth crust?
Q2.
Melting point is highest for
Q3.
Which of the following is the smallest cation?
Q4.
Which of the following minerals does not contain Al?
Q5.
The chief ore of aluminium is
Q6.
The chemical composition of cryolite mineral is
Q7.
Corundum is an ore of
Q8.
Aluminium is extracted by the electrolysis of
Q9.
A layer of coke is spread over bauxite during extraction of aluminium. This acts as a/an
Q10.
In the extraction of aluminium the electrolyte is
Q11.
Aluminium is obtained by
Q12.
In the electrolysis of alumina, cryolite is added to
Q13.
Electrolytic reduction of alumina to aluminium by Hall-Heroult process is carried out
Q14.
The function of fluorspar in the electrolytic reduction of alumina dissolved in fused cryolite (Na3AlF6) is
Q15.
Which metal is extracted only by electrolytic reduction?
Q16.
Aluminium metal is refined by
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Q17.
Aluminium becomes passive in
Q18.
Which metal is protected by a layer of its own oxide?
Q19.
Aluminium is more reactive than iron. But aluminium is less easily corroded than iron because
Q20.
Aluminium vessels should not be washed with materials containing washing soda since
Q21.
Which of the following process does not involve a catalyst?
Q22.
Thermite is a mixture of
Q23.
In thermite process which of the following is used as a reducing agent?
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Q24.
In thermite welding process we use
Q25.
Which of the following bases will react with alkalies?
Q26.
Aluminium oxide is not reduced by chemical reactions since
Q27.
Substance soluble in NaOH is
Q28.
Anhydrous AlCl3 fumes in moist air because of
Q29.
Aluminium (III) chloride forms a dimer because
Q30.
Common alum is
Q31.
Which of the following does not form alum?
Q32.
Aqueous solution of potash alum is
Q33.
Potash alum is water soluble and ionises in aqueous solution to give
Q34.
The important source of boron is
Q35.
H3BO3 is
Q36.
Which one of the following is not an electron deficient compound?
Q37.
Three centred bond is present in
Q38.
The hardest compound of boron is
Q39.
Borazole is known as
Q40.
Chemically borax is
Q41.
Borax is prepared by treating colemanite with
Q42.
In the borax bead test of Co2+, the blue colour of bead is due to the formation of
Q43.
Borax bead test is not given by
Q44.
In diborane
Q45.
In diborane, banana bond is formed between
Q46.
Which one is a Lewis acid?
Q47.
Which of the following is the strongest Lewis acid?
Q48.
Aluminium is most abundant in earth crust, yet it is obtained from bauxite because
Q49.
Anhydrous AlCl3 is prepared from
Q50.
The process of converting hydrated alumina into anhydrous alumina is called