InterviewSolution
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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.
| 151. |
`Ca_(2)B_(6)O_(11)+Na_(2)CO_(3)overset(Delta)rarr[X]+CaCO_(3)+NaBO_(2)` (unbalanced equation) Correct choice (s) for [X] is/are :A. X with `NaOH(aq)`, gives a compound which on reaction with `H_(2)O_(2)` in alkaline medium yield a compound used as a brightner in soaps.B. Structure of anion of crystalline [X] has one boron atom `sp^(3)` hybridised and other three boron atoms `sp^(2)` hydridiseed.C. Hydrolysis of `[X]` with `HCl` or `H_(2)SO_(4)` yields a compound on reaction with HF gives fluoroboric acid.D. [X] on heating with chromium salts in oxidising flame green coloured bead. |
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Answer» Correct Answer - A::C::D |
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| 152. |
`x+"Coke" + Cl_(2) rarr Q + CO uarr` `Q + LiAlH_(4) rarr Y + LiCl + AlCl_(3)` `Y + NaH rarr T` If `"Y"` is a hydride which on hydrolysis under appropriate conditions produces a weak monobasic acid M, then choose the correct statement(s) based on above sequence of reactions:A. X is acidic oxideB. Q is a Lewis acidC. Equivalent weight of M in its reaction with a base under suitable condition is 62D. M can also be obtained by hydrolysis of BN under appropriate conditions. |
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Answer» Correct Answer - A::B::C::D |
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| 153. |
Lithium aluminium hydride `LiAlH_(4)` ,acts asA. Oxidising agentB. Complex formating agentC. Resucing agentD. Both Oxidant and reductant |
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Answer» Correct Answer - 3 |
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| 154. |
`Ca_(2)B_(6)O_(11) + Na_(2)CO_(3) overset("fusion")rarr A + B + CaCO_(3)` `A("solution") + CO_(2) rarr B + Na_(2)CO_(3)` `B + Conc HCl rarr NaCl + C ("acid")` The correct statement(s) among the following is/are :A. Compound A is `NaBO_(2)`B. `1` mole of solution of B requires 2 moles of HCl for its complete reactionC. Compound C is `H_(2)B_(4)O_(7)`,D. pH of aq solution of B is equal to pKa of acid C when equimolar solutions of B and C are considered. |
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Answer» Correct Answer - A::B::C |
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| 155. |
Consider the following sequence of reactions: `B_(2)O_(3) + CaF_(2) + H_(2)SO_(4) rarr (A) + (B) + H_(2)O` (A) `+LiAlH_(4) rarr (C)(g) + (D) + LiF` (C) `+H_(2)ODeltararr (D) + H_(2) uarr` (D) `+Na_(2)CO_(3) rarr (E) + NaBO_(2) + CO_(2) uarr` (E) `+NH_(4)Cl rarr (F) + B_(2)O_(2) + NaCl + H_(2)O` The emipirical formula mass of compound (F)A. 25B. 15C. 50D. 117.5 |
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Answer» Correct Answer - A |
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| 156. |
`Be(OH)_(2)`A. `Mg(OH)_(2)`B. `Mg(OH)_(2)`C. `B(OH)_(3)`D. `Al(OH)_(3)` |
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Answer» Correct Answer - 3 |
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| 157. |
Alums having the general formula `M_(2)SO_(4).M_(2)^(1)(SO_(4))_(3).24H_(2)O` where M is monovalent basic radical while M is trivalent basic radical. Alums are generally obtained when hot solutions of equimolar quantities of their constituent sulphates are mixed and the resulting solution is subjected to crystallization. Alums are fairly soluble in hot water but less solubel in cold water The aqueous solution of potash alum isA. AcidicB. BasicC. NeutralD. Can not be predicted |
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Answer» Correct Answer - A |
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| 158. |
Alums having the general formula `M_(2)SO_(4).M_(2)^(1)(SO_(4))_(3).24H_(2)O` where M is monovalent basic radical while M is trivalent basic radical. Alums are generally obtained when hot solutions of equimolar quantities of their constituent sulphates are mixed and the resulting solution is subjected to crystallization. Alums are fairly soluble in hot water but less solubel in cold water The chemical formula of feldspar isA. `KAlSi_(3)O_(8)`B. `Ca_(2)B_(6)O_(11)`C. `AlPO_(4).Al(OH)_(3).H_(2)O`D. `K_(2)SO_(4).Al_(2)(SO_(4))_(3).4Al(OH)_(3)` |
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Answer» Correct Answer - A |
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| 159. |
Alums having the general formula `M_(2)SO_(4).M_(2)^(1)(SO_(4))_(3).24H_(2)O` where M is monovalent basic radical while M is trivalent basic radical. Alums are generally obtained when hot solutions of equimolar quantities of their constituent sulphates are mixed and the resulting solution is subjected to crystallization. Alums are fairly soluble in hot water but less solubel in cold water Which of the following cation can not form alumA. `Na^(+)`B. `NH_(4)^(+)`C. `Li^(+)`D. `Cs^(+)` |
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Answer» Correct Answer - C |
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| 160. |
Select coloured alumA. `Potash alumB. Ammon alumC. Chrome alumD. All of these |
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Answer» Correct Answer - 3 |
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| 161. |
The number of water molecules coordinated to each monovalent cation in alum is |
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Answer» Correct Answer - 6 |
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| 162. |
Among `H_(3)BO_(3), AlCl_(3), BF_(3), B_(2)H_(6)`, `Li[BH_(4)], AlF_(6)^(3-), [BH_(4)]^(-)`, the number of Lewis acids are : |
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Answer» Correct Answer - 4 |
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| 163. |
Ionisation enthalpy `(Delta_(i)"H kJ mol"^(-1))` for the elements of group 13 follows the order.A. `B gt Al gt Ga gt In gtTI `B. `B gt Al gt Ga gt In gtTI `C. `B gt Al gt Ga gt In gtTI 4 `D. `B gt Al gt Ga gt In gtTI ` |
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Answer» Correct Answer - 4 |
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| 164. |
The number of hydrogen bonds that can be formed by each boric acid molecule is |
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Answer» Correct Answer - 6 |
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| 165. |
The number of B-O bonds in peroxoborate is |
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Answer» Correct Answer - 8 |
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| 166. |
Number of compounds which is/are only acidic: `Be(OH)_(2), Mg(OH)_(2), Al(OH)_(3), B(OH)_(3), Tl(OH)_(3), Ga(OH)_(3)` |
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Answer» Correct Answer - 1 |
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| 167. |
Al and Ga have the same covalent radius because ofA. Greater shielding of s- electrons of Ga atomsB. Poor shielding of s-eletrons of Ga atomsC. Poor shiedling of d-electrons of Ga atomsD. Greater shieldinfg of d-electrons Ga atoms |
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Answer» Correct Answer - 3 |
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| 168. |
Covalent character is maximum forA. `AlF_(3)`B. `AlCl_(3)`C. `AlBr_(3)`D. `AlI_(3)` |
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Answer» Correct Answer - D |
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| 169. |
A coloured salt of cobalt is subjected to borax bead test. The transparent borax bead turns blue. From the given reaction, identify the one which does not take place during the processA. `4NaBO_(2) + CO_(2) rarr Na_(2)B_(4)O_(7) + Na_(2)CO_(3)`B. `Na_(2)B_(4)O_(7) rarr 2NaBO_(2) + B_(2)O_(3)`C. `Na_(2)[B_(4)O_(5)(OH)_(4)].8H_(2)O rarr Na_(2)B_(4)O_(7) + 10H_(2)O`D. `CoO + B_(2)O_(3) rarr Co(BO_(2))_(2)` |
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Answer» Correct Answer - A |
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| 170. |
From `B_(2)H_(6)`, all the following can be prepared exceptA. `H_(3)BO_(3)`B. `[BH_(2)(NH_(3))_(2)][BH_(4)]^(-)`C. `B_(2)(CH_(3))_(6)`D. `NaBH_(4)` |
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Answer» Correct Answer - 3 |
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| 171. |
White crystalline compound (X) reacts with water to produce an alkaline solution. On heating it produce a transparaent bead which on heating with `CuSO_(4)` form a blue colour bead Y. Compound X on heating with ethanol and `H_(2)SO_(4)` give green edged flame. Compound X dissolved in `NaOH` but when conc. `H_(2)SO_(4)` is added white crystals of an acid (Z) separate out. The green edged flame is because ofA. vapours of ethanolB. vapours of sulphuric acidC. vapour of trithyl borateD. vapours of boron trisulphate |
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Answer» Correct Answer - C |
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| 172. |
Which of the following exist as polymer in solid state?A. `NaHCO_(3)`B. `BeCl_(2)`C. `KHCO_(3)`D. `H_(3)BO_(3)` |
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Answer» Correct Answer - A::B::D |
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| 173. |
Correct statements areA. Aluminium dissolves in `NaOH`B. Sodium meta aluminate is `Na^(+)[Al(H_(2)O)_(2)(OH)_(4)]^(-)`C. Crystalline form of Al has no reaction with airD. Aluminium is the most abundant element in the earth crust |
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Answer» Correct Answer - A::B::C |
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| 174. |
`B_(2)O_(3)` can be converted to `BCl_(3)` by heatingA. `B_(2)O_(3)` with `Cl_(2)` gas in the presence of `SiO_(2)`B. `B_(2)O_(3)` with `HCl` gasC. `B_(2)O_(3)` with `NaCl` in solid stateD. A mixture of `B_(2)O_(3)` and Carbon in dry `Cl_(2)` gas |
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Answer» Correct Answer - B |
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| 175. |
`B_(3)N_(3)H_(6) +` solution of hydrochloric acid `rarr`? Select correct about above equationA. No reactionB. `B_(3)N_(3)H_(6)` show substitution reaction and produce `B_(3)N_(3)Cl_(6)`C. `B_(3)N_(3)H_(6)` show addition reaction and produce `B_(3)N_(3)H_(9)Cl_(3)` in about which `Cl` is bonded to boronD. `B_(3)N_(3)H_(6)` show addition reaction and produce `B_(3)N_(3)H_(9)Cl_(3)` in which `Cl` is bonded to nitrogen |
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Answer» Correct Answer - C |
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| 176. |
Aluminum is extreasted fromA. MagnetiteB. BauxiteC. AluiniumD. Haematite |
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Answer» Correct Answer - 2 |
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| 177. |
the maxium covalency of aluminum isA. 4B. 6C. 8D. 3 |
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Answer» Correct Answer - 2 |
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