Boron Family (Chemistry) Multiple Choice Questions:
Ques. Which of the following statements about H3BO3 is not correct
(a) It is a strong tribasic acid
(b) It is prepared by acidifying an aqueous solution of borax
(c) It has a layer structure in which planar BO3 units are joined by hydrogen bonds
(d) It does not act as proton donor but acts as a Lewis acid by accepting hydroxyl ion
Ques. Aluminium is more reactive than iron. But aluminium is less easily corroded than iron because
(a) Aluminium is a noble metal
(b) Oxygen forms a protective oxide layer
(c) Iron undergoes reaction easily with water
(d) Iron forms mono and divalent ions
Ques. Which of the following is not true about potash alum
(a) Its empirical formula is KAl(SO4)2.12H2O
(b) Its aqueous solution is basic
(c) It is used in dyeing industries
(d) On heating it melts in its water of crystallization
Ques. In the electrolytic method of obtaining aluminium from purified bauxite, cryolite is added to the charge in order to
(a) Minimize the heat loss due to radiation
(b) Protect aluminium produced from oxygen
(c) Dissolve bauxite and render it conductor of electricity
(d) Lower the melting point of bauxite
Ques. In diborane, the two H – B – H angles are nearly
(a) 60°, 120°
(b) 95°, 120°
(c) 95°, 150°
(d) 120°, 180°
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Ques. Aluminium vessels should not be washed with materials containing washing soda since
(a) Washing soda is expensive
(b) Washing soda is easily decomposed
(c) Washing soda reacts with aluminium to form soluble aluminate
(d) Washing soda reacts with aluminium to form insoluble aluminium oxide
Ques. Bauxite containing impurities of iron oxide is purified by
(a) Hoop’s process
(b) Serpeck’s process
(c) Baeyer’s process
(d) Electrolytic process
Ques. Purification of aluminium done by electrolytic refining is known as
(a) Serpeck’s process
(b) Hall’s process
(c) Baeyer’s process
(d) Hoop’s process
Ques. Which one of the following is correct statement?
(a) The hydroxide of aluminium is more acidic than that of boron
(b) The hydroxide of boron is basic, while that of aluminium is amphoteric
(c) The hydroxide of boron is acidic, while that of aluminium is amphoteric
(d) The hydroxide of boron and aluminium are amphoteric
Ques. Which of the following is formed when aluminium oxide and carbon is strongly heated in dry chlorine gas
(a) Aluminium chloride
(b) Hydrate aluminium chloride
(c) Anhydrous aluminium chloride
(d) None of these
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Ques. In the metallurgy of aluminium, cryolite is mixed in the molten state because it
(a) Increases the melting point of alumina
(b) Oxidises alumina
(c) Reduces alumina
(d) Decreases the melting point of alumina
Ques. In the Hoope’s process for refining of aluminium, the fused materials form three different layers and they remain separated during electrolysis also. This is because
(a) The upper layer is kept attracted by the cathode and the lower layer is kept attracted by the anode
(b) There is special arrangement in the cell to keep the layers separate
(c) The 3 layers have different densities
(d) The 3 layers are maintained at different temperatures
Ques. The hardest substance amongst the following is
(a) Be2C
(b) Graphite
(c) Titanium
(d) BC
Ques. AlCl3 is
(a) Anhydrous and covalent
(b) Anhydrous and ionic
(c) Covalent and basic
(d) Coordinate and acidic
Ques. In the electrolytic extraction of aluminium, cryolite is used
(a) To obtain more aluminium
(b) To decrease temperature to dissolve bauxite
(c) To protect the anode
(d) As reducing agent
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Ques. Which of the following is known as inorganic benzene?
(a) Borazine
(b) Boron nitride
(c) p-dichlorobenzene
(d) Phosphonitrilic acid
Ques. Moissan boron is
(a) Amorphous boron of ultra purity
(b) Crystalline boron of ultra purity
(c) Amorphous boron of low purity
(d) Crystalline boron of low purity
Ques. In Hall’s process, the main reagent is mixed with
(a) NaF
(b) Na3AlF6
(c) AlF3
(d) None of these
Ques. In the extraction of aluminium, bauxite is dissolved in cryolite because
(a) It acts as a solvent
(b) It reduces melting point of aluminium oxide
(c) It increases the resistance of aluminium oxide
(d) Bauxite becomes active
Ques. Aluminium has a great affinity for oxygen and its oxidation is an exothermic process. This fact is made use of in
(a) Preparing thin foils of aluminium
(b) Making utensils
(c) Preparing duralumin alloy
(d) Thermite welding
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Ques. Which of the following does not exist in free form?
(a) BF3
(b) BCl3
(c) BBr3
(d) BH3
Ques. In the extraction of aluminium the electrolyte is
(a) Fused cryolite with feldspar
(b) Fused cryolite with fluorspar
(c) Pure alumina in molten cryolite
(d) Pure alumina with bauxite and molten cryolite
Ques. Alumina is
(a) Acidic
(b) Basic
(c) Amphoteric
(d) None of these
Ques. Aluminium is not used
(a) In silvery paints
(b) For making utensils
(c) As a reducing agent
(d) As oxidizer in metallurgy
Ques. In the electrolysis of alumina, cryolite is added to
(a) Increase the melting point of alumina
(b) Increase the electrical conductivity
(c) Minimise the anodic effect
(d) Remove impurities from alumina
Ques. Soft heavy metal melts at 30oC and is used in making heat sensitive thermometers the metal is
(a) Galium
(b) Sodium
(c) Potassium
(d) Caesium
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Ques. Crystalline metal can be transformed into metallic glass by
(a) Alloying
(b) Pressing into thin plates
(c) Slow cooling of molten metal
(d) Very rapid cooling of a spray of the molten metal
Ques. In electrolysis of aluminium oxide which of the following is added to accelerate the process
(a) Silica
(b) Cryolite
(c) Nickel
(d) Silicate
Ques. When Al is added to KOH solution
(a) No action takes place
(b) Oxygen is evolved
(c) Water is produced
(d) Hydrogen is evolved
Ques. Hydrogen gas will not reduce:
(a) Heated cupric oxide
(b) Heated ferric oxide
(c) Heated stannic oxide
(d) Heated aluminium oxide
Ques. The structure of diborane (B2H6) contains
(a) Four 2c-2e bonds and two 3c-2e bonds
(b) Two 2c-2e bonds and four 3c-2e bonds
(c) Two 2c-2e bonds and two 3c-3e bonds
(d) Four 2c-2e bonds and four 3c-2e bonds
Ques. Conc. HNO3
(a) Reacts with aluminium vigorously
(b) Reacts with aluminium to form aluminium nitrate
(c) Does not react with aluminium
(d) Reacts with platinum
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Ques. In the thermite process the reducing agent is
(a) Al
(b) C
(c) Mg
(d) Na
Ques. Electrolytic reduction of alumina to aluminium by Hall-Heroult process is carried out in the presence of
(a) NaCl
(b) Fluorite
(c) Cryolite which forms a melt with lower melting temperature
(d) Cryolite which forms a melt with higher melting temperature
