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InterviewSolution
This section includes InterviewSolutions, each offering curated multiple-choice questions to sharpen your knowledge and support exam preparation. Choose a topic below to get started.
| 101. |
`B_(2)O_(3)` isA. AcidicB. BasicC. AmphotericD. None of these |
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Answer» Correct Answer - A `B_(2)O_(3)` is acidic and down the group basic nature of oxides increases. `underset(("acidic"))(B_(2)O_(3))+6NaOH rarr 2Na_(3)BO_(3)+3H_(2)O_(3)` |
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| 102. |
Which out of the following compound does not exist?A. `BF_(3)`B. `TlCl_(3)`C. `TlCl_(5)`D. Both (B) and (C) |
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Answer» Correct Answer - C `Tl^(5+)` does not exist. |
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| 103. |
Which specie does not exist?A. `[BF_(6)]^(3-)`B. `[AlF_(6))]^(3-)`C. `[GaF_(6)]^(3-)`D. `[InF_(6)]^(3-)` |
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Answer» Correct Answer - A `BF_(3)` cannot more than one `F^(-)` ion due to non availability of vacant d-orbitals. This is because maximum covalency of boron is four |
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| 104. |
Which is not a mineral of aluminiumA. AnhydriteB. BauxiteC. CorundumD. Diaspore |
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Answer» Correct Answer - A Anhydrite `(CaSO_(4))` is not a mineral of aluminium. |
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| 105. |
Which of the following mineral does not contain Al?A. CryoliteB. MicaC. FeldsparD. Fluorspar |
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Answer» Correct Answer - D Fluorspar `(CaF_(2))` does not contain aluminium. |
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| 106. |
Sapphire is a mineral ofA. BaB. BC. BiD. Al |
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Answer» Correct Answer - D Sapphire (blue colour) is a mineral of Al. |
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| 107. |
A mineral acid used as disinfectant isA. Phosphoric acidB. Sulphuric acidC. Phosphrous acidD. Boric acid |
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Answer» Correct Answer - D Boric acid `H_(3)BO_(3)` has antiseptic properties. |
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| 108. |
Mark the incorrect statement. Pure alumina isA. a bad conductor of electricity.B. a good conductor of electricityC. an electrovalent compound.D. volatile in nature |
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Answer» Correct Answer - A::C::D Pure alumina is not an electrovalent compound. It is a bad conductor of electricity and non-volatile in nature with very high melting point. |
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| 109. |
When bauxite powder is mixed with coke and reacted with nitrogen at 2075 K, carbon monoxide and X are formed. What is the gas formed when X is reacted with water ?A. `NH_(3)`B. `N_(2)`C. `N_(2)O`D. `O_(2)` |
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Answer» Correct Answer - A When bauxite mixed with coke is heated in an atmosphere of `N_(2)` at 2075 K. AIN is formed. AIN reacts with water to give `NH_(3)` `Al_(2)O_(3) + 3C + N_(2) rarr 2AIN + 3CO uarr` `AIN + 3H_(2)O rarr Al(OH)_(3)+NH_(3)` |
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| 110. |
Which is true for an element `R` present in `13 th` group of the perodic table?A. It is a gas at room temperatureB. It has oxidation state +4C. It forms `R_(2)O_(3)`D. It forms `RX_(2)` |
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Answer» Correct Answer - C Element R belongs to group 13. As such the formula of its oxide is `R_(2)O_(3)`. (Element R shows the group valency i.e., 3 of Group 13). |
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| 111. |
Elements of group 13 not reacting with water areA. BB. AlC. GaD. In |
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Answer» Correct Answer - C::D B, Ga and In do not react with water. |
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| 112. |
Monovalency of heavier members of group 13 elements can be explained on the basis ofA. their low ionisation energiesB. their low electronegatively valuesC. their larger sizesD. inert pair effect |
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Answer» Correct Answer - D Due to inert pair effect, down the group, the stability of lower oxidation state (+1 in group 13) increases. |
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| 113. |
Which one of the following has the lowest m.p.?A. BB. AlC. GaD. Tl |
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Answer» Correct Answer - C In group 13, Ga has the lowest melting point. |
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| 114. |
A particular element belongs to group 13 and second period of the periodic table, it isA. Gas, slightly metallicB. Liquid, non- metallicC. Solid, non-metallicD. Solid, less metallic |
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Answer» Correct Answer - C The element in second period of group 13 is boron. It is solid and non-metallic in nature. |
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| 115. |
Which of the following atomic numbers represent group 13 elements ?A. 13B. 53C. 31D. 81 |
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Answer» Correct Answer - A::C::D Group 13 elements have atomic number 5,13 31, 49 and 81. |
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| 116. |
Of all the Group 13 elements, the element with lowest electronegatively isA. BB. TlC. InD. Al |
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Answer» Correct Answer - D Group 13 element with lowest electronegativity is Al. |
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| 117. |
In the extraction of aluminium the purpose of addition of cryolite to alumina is :A. to obtain more aluminiumB. to dissolve bauxiteC. to product anodesD. to cause reduction |
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Answer» Correct Answer - B To dissolve bauxite. |
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| 118. |
Which of the following elements is the hardest?A. BoronB. AluminiumC. GalliumD. Indium |
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Answer» Correct Answer - A Boron is a network solid. |
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| 119. |
In the electrolytic extraction of aluminium, the solvent isA. waterB. `Fe_(2)O_(3)+Al`C. Molten cryoliteD. Molten `Al_(2)O_(3)` |
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Answer» Correct Answer - C Molten cryolite acts as solvent. |
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| 120. |
`AlCl_(3)` fumes in moist air becauseA. It is very volatileB. It is covalentC. HCl is formed in moist airD. It is highly hygroscopic |
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Answer» Correct Answer - C Anhydrous `AlCl_(3)` fumes in moist air because of hydrolysis. `AlCl_(3)+3H_(2)O rarr Al(OH)_(3)+3HCl` HCl so produced fumes in moist air. |
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| 121. |
Which out of the following compounds of Boron is hardest ?A. Boron oxideB. Boron carbideC. Boron nitrideD. Boron hydroxide |
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Answer» Correct Answer - B Boron carbide `B_(4)C` (also called Norbia) is the hardest substance. |
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| 122. |
Which one is not an ore of aluminium ?A. China clayB. MicaC. CryoliteD. Carnallite |
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Answer» Correct Answer - D Carnalite, `KCl.MgCl_(2).6H_(2)O`. |
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| 123. |
When Al is added to hot solution of KOH ?A. No action takes placeB. Oxygen is evolvedC. Water is producedD. Hydrogen is evolved |
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Answer» Correct Answer - D `2Al+2KOH+2HOH rarr 2KAlO_(2)+3H_(2)` |
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| 124. |
Anhydrous aluminium chloride is prepared byA. Dissolving aluminium metal in conc. HClB. By heating a mixture of alumina with chlorineC. By heating a mixture of alumina and carbon with dry chlorineD. By heating alumina with dry HCl |
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Answer» Correct Answer - C `Al_(2)O_(3)+3C+3Cl_(2) rarr 2AlCl_(3)+3CO` |
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| 125. |
Aluminium chloride is a/anA. Bronsted-Lowery acidB. Arrhenius acidC. Lewis acidD. Lewis base |
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Answer» Correct Answer - C Anhydrous `AlCl_(3)` is a Lewis acid. |
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| 126. |
Which of the following statements about anhydrous Aluminium chloride is correct?A. It exists as `AlCl_(3)` moleculeB. It is a strong Lewis BaseC. It is not readily hydrolysedD. It sublimes at `100^(@)C` under vacuum |
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Answer» Correct Answer - D It sublimes at `100^(@)C` under vaccum. |
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| 127. |
Eka-aluminium isA. GalliumB. GermaniumC. IndiumD. Scandium |
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Answer» Correct Answer - A Gallium is called Eka-aluminium (means one next to aluminium) |
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| 128. |
Which of the following statements about aluminium chloride is incorrect?A. It exists as a dimerB. It is a covalent compoundC. It involves back bonding between `Cl` and `Al`D. Its aqueous solution conducts electricity |
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Answer» Correct Answer - C Cl donates a lone pair to Al forming a coordinate bond. |
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| 129. |
Anodized aluminium is aluminiumA. obtained on anodeB. alloy, containing 98% aluminiumC. electrolytically coated with aluminium oxideD. None of these |
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Answer» Correct Answer - C Anodized aluminium is aluminium electrolytically coated with `Al_(2)O_(3)`. |
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| 130. |
Diborane undergo alkylation reaction with `Br_(3)` formingA. `B_(2)HR_(5)`B. `B_(2)R_(6)`C. `B_(2)H_(2)R_(4)`D. `B_(2)H_(3)R_(3)` |
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Answer» Correct Answer - C `B_(2)H_(6)+4BR_(3) rarr 3B_(2)H_(2)R_(4)`. Only four terminal hydrogen atoms are replaced by R group whereas bridging hydrogen atoms donot get substituted. |
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| 131. |
Pick up the wrong statementA. Anhydrous `AlCl_(3)` exists as `Al_(2)Cl_(6)` (dimer)B. Anhydrous `AlCl_(3)` is a trigonal planar moleculeC. Anhydrous `AlCl_(3)` fumes in airD. Anhydrous `AlCl_(3)` is ionic. |
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Answer» Correct Answer - D Anhyd. `AlCl_(3)` is covalent compound and not ionic because of high IE required. Instead hydrated `AlCl_(3)` is ionic. |
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| 132. |
Which of the following statements is wrong about `BCl_(3)` ?A. `BCl_(3)` is a covalent compoundB. `BCl_(3)` acts as a Lewis acidC. `BCl_(3)` does not form a dimerD. In `BCl_(3)`, the `B-Cl` bonds are greater than single bonds. |
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Answer» Correct Answer - D All the `B-Cl` bonds are single covalent bonds. |
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| 133. |
Which of the following statements regarding boric acid is false?A. It acts as a tribasic acidB. It has a planar structureC. It acts as a monobasic acidD. It is soluble is hot water |
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Answer» Correct Answer - A Boric acid is a monobasic acid and not tribasic acid. |
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| 134. |
Pick up the wrong statementA. Borax is used in the manufacture of optical glassesB. Borax is used as a fluxC. Borax is used as a water softenerD. Borax is not used for glazing paper |
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Answer» Correct Answer - D It is a wrong statement because borax is used for glazing paper. |
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| 135. |
In meta-aluminates, co-ordination number of aluminium isA. 3B. 6C. 1D. 4 |
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Answer» Correct Answer - B In meta-aluminates, co-ordinates number of aluminium is 6. `underset("Meta-aluminate ion")([Al(OH)_(4)(H_(2)O)_(2)]^(-))` |
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| 136. |
`BCl_(3)+H_(2)O rarr X` The products fored in the above reaction areA. `B_(2)O_(3)+HOCl`B. `H_(3)BO_(3)+HCl`C. `B_(2)H_(6)+HCl`D. No reaction |
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Answer» Correct Answer - B `BCl_(3)+3H_(2)O rarr B (OH)_(3)+3HCl` Thus the products are `B(OH)_(3)` i.e., `H_(3)BO_(3)` and HCl |
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| 137. |
Which out of the following compounds will liberate methane upon reaction with water?A. `BeC_(2)`B. `Al_(4)C_(3)`C. `Be_(2)C`D. Both (B) and (C) |
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Answer» Correct Answer - D `Al_(4)C_(3)+12H_(2)O rarr 4Al(OH)_(3)+3CH_(4)` `Be_(2)C+2HOH rarr 2BE(OH)_(2)+CH_(4)` |
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| 138. |
Which one of the following elements is a non-metal ?A. BoronB. IndiumC. SodiumD. Magnesium |
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Answer» Correct Answer - A Boron is a non-metal. |
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| 139. |
Rubies and sapphires are essentiallyA. `Al_(2)O_(3)+C`B. `Al_(2)O_(3)`C. `Al_(2)O_(3)+Ag_(2)O`D. `Al_(2)O_(3)+Au_(2)O_(2)` |
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Answer» Correct Answer - B Rubies and sapphires essentially consist of `Al_(2)O_(3)`. |
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| 140. |
Aluminium vessels should not be washed with materials containing washing soda because -A. Washing soda is expensiveB. Washing soda is easily decomposedC. Washing soda reacts with Al to form insoluble aluminium oxideD. Washing soda reacts with Al to form soluble aluminate. |
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Answer» Correct Answer - D Aluminium vessels should not be washed with materials containing washing soda since washing soda reacts with Al to form soluble aluminare. |
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| 141. |
Which of the following can be used for the isolation of aluminium ?A. `Al_(2)O_(3) + 3C overset(Delta)rarr 2Al + 3CO uarr`B. `AlCl_(3)+ 3Na rarr 3NaCl + Al`C. `Al_(2)O_(3) + Fe rarr Fe_(2)O_(3)+Al`D. None |
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Answer» Correct Answer - A Before 1886, Al was manufactured by chemical reduction of `AlCl_(3)` with Na `AlCl_(3) + 3Na rarr 3NaCl+Al`. |
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| 142. |
Aluminium alloy with beautiful golden yellow colour used for making artificial jewellery isA. DuraaluminB. MagnaliumC. AlcladD. Aluminium bronze |
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Answer» Correct Answer - D Aluminium bronze has a beautiful golden yellow colour. |
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| 143. |
When zeolite which is hydrated sodium aluminium silicate is treated with hard water, the sodium ions are exchanged withA. `H^(+)` ionsB. `Ca^(2+)`C. `Mg^(2+)`D. `Ca^(2+)` and `Mg^(2+)` |
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Answer» Correct Answer - D Zeolite is hydrated sodium aluminium silicate. It replace the `Ca^(2+)` and `Mg^(2+)` ions present in hard water with `Na^(+)` ions. |
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| 144. |
In reaction `BF_(3)+3LiBH_(4) rarr 3LiF+X`, X isA. `B_(4)H_(10)`B. `B_(2)H_(6)`C. `BH_(3)`D. `B_(3)H_(8)` |
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Answer» Correct Answer - B `BF_(3) + 3LiBH_(4) rarr 3LiF + 2B_(2)H_(6)` |
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| 145. |
In which of the following minerals, Al is not presentA. CryoliteB. MicaC. FeldsparD. Fluorspar |
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Answer» Correct Answer - D Fluorspar `(CaF_(2))` does not contain aluminium. Feldspar `(K_(2)O.Al_(2)O_(3).6H_(2)O)`, mica `(KAl_(3)Si_(3)O_(10)(OH)_(2))` and cryolite `(Na_(3)AlF_(6))` contain aluminium. |
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| 146. |
The ignition mixture used in alumino-thermy is a mixture ofA. Mg powder `+Na_(2)O_(2)`B. Al powder `+ BaO_(2)`C. Al powder `+ Na_(2)O_(2)`D. Mg powder + `BaO_(2)` |
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Answer» Correct Answer - B Ignition mixture used in aluminothermy is a mixture of aluminium powder and barium peroxide `(BaO_(2))`. |
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| 147. |
Thermite is a mixture of iron oxide andA. zinc powderB. sodium shavingsC. potassium metalD. aluminium powder |
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Answer» Correct Answer - D Thermite is a mixture of iron oxide `(Fe_(2)O_(3))` and aluminium powder. |
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| 148. |
Thermite is a mixture ofA. Fe and AlB. Ferric oxide and aluminium powderC. Barium peroxide and magnesium powderD. Cu and Al |
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Answer» Correct Answer - B `Fe_(2)O_(3)+Al` powder is thermite used in alumino thermite process. |
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| 149. |
In the thermite welding process we useA. Al powderB. Fe powderC. Ca powderD. `Al+Fe_(2)O_(3)` mixture. |
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Answer» Correct Answer - A In thermite process a mixture of aluminium powder and `Fe_(2)O_(3)` is used. |
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| 150. |
Hydrogen will not reduceA. Heated cupric oxideB. Heated ferric oxideC. Heated stannic oxideD. Heated aluminium oxide |
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Answer» Correct Answer - D Hydrogen will not reduce heated `Al_(2)O_(3)`. |
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