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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.
| 701. |
Which of the following is the strongest acid ?A. HBrB. HFC. `H_(2)S`D. `PH_(3)` |
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Answer» Correct Answer - A |
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| 702. |
Which of the following is not hydrolysed ?A. `AsCl_(3)`B. `PF_(3)`C. `SbCl_(3)`D. `NF_(3)` |
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Answer» Correct Answer - D Neither N nor F has d-orbitals to accept electrons donated by water for hydrolysis. |
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| 703. |
Which of the following statements is correct?A. `BCl_(3)` and `AlCl_(3)` are both Lewis acids and `BCl_(3)` is stronger than `AlCl_(3)`B. `BCl_(3)` and `AlCl_(3)` both are Lewis acids and `ACl_(3)` is stronger than `BlCl_(3)`C. `BCl_(3)` is a Lewis acid and `AlCl_(3)` are not Lewis acidsD. Both `BCl_(3)` and `AlCl_(3)` are not Lewis acids |
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Answer» Correct Answer - A `BCl_(3)` and `AlCl_(3)` both are electron-deficient compound and can accept lone pair to act as Lewis acid. Also `BCl_(3)` involves smaller boron atom and, thus, attracts electron pair more easily. |
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| 704. |
The bleaching action of the bleaching powder is due to the liberation ofA. ChlorineB. Molecular oxygenC. Nascent oxygenD. Calcium carbonate |
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Answer» Correct Answer - C `CaOCl_(2)rarrCaCl_(2)+[O]` Nascent oxygen |
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| 705. |
Statement-1 : `H_(2)O_(2)` is stored in wax-lined glass. Statement-2 : Presence of traces of alkali metal ions in the glass catalyse the decomposition of `H_(2)O_(2)`.A. Statement-1 is True, Statement-2 is True, Statement-2 is a correct explanation for Statement-18B. Statement-1 is True, Statement-2 is True, Statement-2 is NOT a correct explanation for Statement-19C. Statement-1 is True, Statement-2 is False.D. Statement-1 is False, Statement-2 is True. |
| Answer» Correct Answer - A | |
| 706. |
The halogens are :A. transition elementsB. inner-transition elementsC. noble elementsD. representative elements |
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Answer» Correct Answer - D |
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| 707. |
`H_(2)O` is oxidised to `O_(2)` by :A. `CIO_(2)`B. `H_(2)O_(2)`C. `H_(2)O`D. `F_(2)` |
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Answer» Correct Answer - D |
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| 708. |
Which statement is correct about halogen ?A. They are all diatomic and form univalent ionsB. Halogen have the smallest atomic radii in there respective periodsC. They are all diatomic and form diatomic ionsD. They are all reducing agents |
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Answer» Correct Answer - AB |
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| 709. |
In which cases, the order of acidic strength is not correct ?A. `HI gt HBr gt HCl `B. `HIO_(4) gt HBrO_(4) gt HClO_(4)`C. `HClO_(4) gt HClO_(3) gt HClO_(2)`D. `HF gt H_(2)O gt NH_(3)` |
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Answer» Correct Answer - B The acidic strength of oxo-acids decreases downwards in a group . The correct order of acidic strength of oxo-acids of halogens is `HClO_(4) gt HBrO_(4) gt HIO_(4)` |
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| 710. |
Identify the incorrect statement among the following.A. Ozone reacts with `SO_2` to gives `SO_3` .B. Silicon reacts with NaOH(aq) in the presence of air to give `Na_2SiO_3` and `H_2O`C. `Cl_2` reacts with excess of `NH_3` to give `N_2` and HCl .D. `Br_2` reacts with hot and strong NaOH to give NaBr , `NaBrO_(4) and H_(2)O` |
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Answer» Correct Answer - D `Br^(2)` reacts with hot and strong NaOH to give NaBr , `NaBrO_(4) and H_(2)O` |
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| 711. |
Which one of the following is an oxyacid ?A. `Ba(OH)_2 `B. `Mg(OH)_2 `C. `H_3PO_3`D. HCl |
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Answer» Correct Answer - C `H_3PO_4` is oxyacid (Acid containing oxygen atom ) |
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| 712. |
Which of the following dissolves in water but does not give any oxyacid solution ?A. `SO_(2)`B. `OF_2`C. `SCl_4`D. `SO_3 ` |
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Answer» Correct Answer - B `OF_(2)` dissolves in water but does not give any oxoacid solution. While `SO_(2),SCl_(4), and SO_(3)` give oxoacid solution in water . `SO_(2)+H_(2)O to underset("Sulphurous acid ")(H_(2)SO_(3))` ltbvrgt `SCl_(4)+3H_(2)O to underset("Sulphurous acid ")(H_(2)SO_(3))+4HCl ` `SO_(3)+H_(2)O to underset("Sulphuric acid ")(H_(2)SO_(4))` |
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| 713. |
Which of the following interhalogens can not exist ?A. `CIF_5`B. `ClI_5`C. `IC l_2^-`D. `IF_4^-` |
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Answer» Correct Answer - B `ClI_5` cannot exist because chlorine cannot coordinate to five large sized I atoms |
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| 714. |
Chlorine reacts with excess `NH_3` to giveA. `NCl_3`B. HCIC. `N_2`D. `N_2 + NH_4Cl` |
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Answer» Correct Answer - D `underset"excess"(8NH_3) + 3Cl_2 to N_2 + 6NH_4Cl` |
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| 715. |
Silicone oil is obtained from the hydrolysis and polymerization ofA. trimethychlorosilane and dimethyldichloro-silaneB. trimethylchlorosilane and methyltrichloro-silaneC. methyltrichlorosilance and dimethyldichloro-silaneD. triethylchlorosilance and diethyldichlorosilance |
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Answer» Correct Answer - A Hydrolysis of `(CH_(3))_(2)SiCl_(2)` followed by condensation gives straight chain polymer , whose chain length is controlled by `(CH_(3))_(3)SiCl` . |
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| 716. |
The lead of lead pencils melts atA. `2000^(@)C`B. `350^(@)C`C. `3170^(@)C`D. `75^(@)C` |
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Answer» Correct Answer - C The lead of pencils is actually graphite which has a high m.p. of `3170^(@)C`. |
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| 717. |
Which of the following oxyacids acts as most reducing agent?A. `H_(3)PO_(3)`B. `H_(3)PO_(2)`C. `H_(4)P_(2)O_(6)`D. `H_(4)P_(2)O_(7)` |
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Answer» Correct Answer - A `H_(3)PO_(3)` acts as most reducing agent because it is present in `(+3)` oxidation state it can be further oxidised and increase its oxidation state. `H-underset(OH)underset(|)overset(O)overset(uarr)(P)-H` |
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| 718. |
Reoeatead use of which of the following fertilizers would increase the acidity of the siolA. UreaB. Potassium nitrateC. Ammonium sulphateD. superphosphate of lime |
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Answer» Correct Answer - C `(NH_(4))_(2)SO_(4)` is a salt of weak base and strong acid `NH_(4)_(2)SO_(4)+2H_(2)Orarr underset("Weak base")(2NH_(4)OH)+ underset("Strong acid")(H_(2)SO_(4))` |
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| 719. |
Which gas is obtained when urea is heated with `HNO_(2)`?A. `N_(2)`B. `H_(2)`C. `O_(2)`D. `NH_(3)` |
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Answer» Correct Answer - A `NH_(2)-CO-NH_(2)+2HNO_(2)rarrCO_(2)+3H_(2)O+2H_(2)` |
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| 720. |
Deep sea divers used to respire in a mixture ofA. Oxygen and argonB. Oxygen and heliumC. Oxygen and nitrogenD. Oxygen and hydrogen |
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Answer» Correct Answer - B An oxygen-helium mixure is used artificial respiration in deep sea diving instead of air because nitrogen present in air dissolves in blood under high pressure when sea diver goes into deep sea. When he comes to the surface, nitrogen bubbles out of the blood due to decrease in pressure, causing pains. this disease is called "bends". |
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| 721. |
Which of the following oxyacids of phosphorus is a reducing agent and monobasic?A. `XeF_(2)`B. `XeF_(4)`C. `XeO_(3)`D. `XeF_(6)` |
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Answer» Correct Answer - C `XeF_(2)overset("Ni tube")(rarr)XeF_(2),Xe+2F_(2)overset(673K)underset(6 atm)(rarr)XeF_(4)` `Xe+3F_(2)overset(573-573K)underset(50-60" atom")(rarr)XeF_(6)` `XeO_(3)` is obtained by the hydrolysis of `XeF_(6)` `XeF_(6)+3H_(2)OrarrXeO_(3)+6HF` |
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| 722. |
Red and white phosphorus will differ but not in:A. smellB. solubility in `CHCl_(3)`C. exhibiting phosphorescenceD. reaction with concentrated `HNO_(3)` |
| Answer» Correct Answer - D | |
| 723. |
Compound used in safety matches is :A. `P_(4)S_(3)`B. `P_(4)`C. `P_(2)O_(5)`D. `PCl_(3)` |
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Answer» Correct Answer - A Match stick contain `P_(4)S_(3)` and `KCIO_(3)` fillers and glue.The friction between the matchstick and the sand paper initiates a violent reaction between `P_(4)S_(3)` and `KCIO_(3)`. The generates enough heat to make the matchstick burst into flame. |
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| 724. |
Heating an aqueous solution of aluminium chloride to dryness will giveA. `Al(OH)Cl_(2)`B. `Al_(2)O_(3)`C. `Al_(2)Cl_(6)`D. `AlCl_(3)` |
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Answer» (b) Aqueous solution of `AlCl` is acidic due to hydrolysis `AlCl_(3)+3H_(2)OhArrAl(OH)_(3)+3HCl` On strong heating, `Al(OH)_(3)` is converted into `Al_(2)O_(3)`. `2Al(OH)_(3)overset(Delta)toAl_(2)O_(3)+3H_(2)O` |
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| 725. |
Heating an aqueous solution of aluminium chloride to dryness will giveA. `AlCl_(3)`B. `Al_(2)Cl_(6)`C. `Al_(2)O_(3)`D. `Al(OH)Cl_(2)` |
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Answer» Correct Answer - C On heating , `AlCl_(3) (aq)` gives `Al_(2)O_(3)` `2AlCl_(3) + 6 H_(2)O rarr 2Al(OH)_(3) + 6HCl` `2Al(OH)_(3) overset("Dryness")rarr Al_(2)O_(3)+ 3H_(2)O` |
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| 726. |
The order of acidic strenght boron trihalides is:A. `BF_(3)ltBCl_(3)ltBBr_(3)ltBl_(3)`B. `Bl_(3)ltBBr_(3) ltBCl_(3)ltBF_(3)`C. `BCl_(3)ltBBr_(3)ltBl_(3)ltBF_(3)`D. `BBr_(3)ltBCl_(3)ltBF_(3)ltBl_(3)` |
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Answer» Correct Answer - A Is the correct order. This is ex plained wiith the help of c onc ept of back b onding which is maximum in `BF_(3)` and least in `Bl_(3)`. |
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| 727. |
Which of the following statement is incorrect?A. Pure sodium metal dissolves in liquid ammonia to give blue soluionB. NaOH reacts with glass to give sodium silicateC. Aluminium reacts with excess `NaOH` to give `Al(OH)_(3)`D. `NaHCO_(3)` in heating gives `Na_(2)CO_(3)` |
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Answer» Correct Answer - C `Al(OH)_(3)` dissolves in `NaOH` to give `NaAlO_(2)`. |
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| 728. |
Which oxide has the higest melting point?A. `H_(2)O`B. `NO_(2)`C. `SO_(2)`D. `SiO_(2)` |
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Answer» Correct Answer - D `SiO_(2)` is network solid. |
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| 729. |
In the reaction `B_(2)O_(3)+C+CL_(2)toA+CO`. The A isA. `BCl_(3)`B. `BCl_(2)`C. `B_(2)Cl_(2)`D. `CCl_(2)` |
| Answer» Correct Answer - A | |
| 730. |
Which one of the following elements has the higest melting pointA. AlB. BC. GaD. Tl |
| Answer» Correct Answer - B | |
| 731. |
The gas produced from thermal decomposition of ` (NH_(4))_(2)Cr_(2)O_(7)` isA. `NH_(3)`B. `N_(2)`C. `O_(2)`D. `NO ` |
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Answer» Correct Answer - B `(NH_(4))_(2)Cr_(2)O_(7) overset(Delta)to N_(2)+Cr_(2)O_(3)+4H_(2)O` |
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| 732. |
Oxygen gas can be produced by the decomposition of all of the following substances except:A. calcium oxideB. hydrogen peroxideC. mercury (II) oxideD. ozone |
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Answer» Correct Answer - A `CaO` is thermodynamically stable. |
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| 733. |
Of the following compounds, the most acidic isA. `As_(2)O_(3)`B. `P_(2)O_(3)`C. `Sb_(2)O_(3)`D. `Bi_(2)O_(3)` |
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Answer» Correct Answer - B `P_(2)O_(3)` is most acidic because electrongativity decreases. O atoms in `P_(4)O_(10)`. |
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| 734. |
`H_(3)PO_(3)` isA. dibasic acidB. tribasic acidC. monobasicD. Neutral |
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Answer» Correct Answer - A The structure of phosphorous acid `(H_3PO_3)` is as follows : ` HO-underset(H)underset(|)overset(O)overset(||)P-OH` At it has two-OH groups , hence it shows dibasic acid . |
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| 735. |
Oxidation state of phosphorus in cyclotrimetaphosphoric acid isA. `+3`B. `+5`C. `-3`D. `+2 ` |
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Answer» Correct Answer - B Phosphorus is in +5 oxidation state in cyclotrimeta phosphoric acid . |
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| 736. |
Asseration: `N` in `NO_(2)` and nitrolic acid has `+4` and `+3` oxidation number respectively. Reason: `NO_(2)` is acid anhydride of nitroxylic acid.A. If both asseration and reson are true and the reason is the correct explanation of the asseration.B. If both asseration and reason are true ans the reason is the correct explanation of the asseration.C. If asseration is true but reason is false.D. If asseration is false but reason is true. |
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Answer» Correct Answer - C `NO_(2)` has +4ox.no. in `NO_(2)` and in nitroxylic acid `(H_(2)N_(2)O_(4))` it has `+3` oxidation state. |
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| 737. |
Asseration: `NH_(3)` and `PH_(3)` differ from each other in their reaction with `CuSO_(4)` or `AgNO_(3)`. Reason: `PH_(3)` acts as oxidising agent in these reacrion but `NH_(30` not.A. If both asseration and reson are true and the reason is the correct explanation of the asseration.B. If both asseration and reason are true ans the reason is the correct explanation of the asseration.C. If asseration is true but reason is false.D. If asseration is false but reason is true. |
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Answer» Correct Answer - C `{:(CuSO_(4)+4NH_(3)toCu(NH_(3))_(4)SO_(4)),(AgNO_(3)+2NH_(2)toAg(NH_(3))_(2)NO_(3)):}}"Complex formation"` `{:(3CuSO_(4)+2PH_(3)toCu_(3)P_(2)+3H_(2)SO_(4)),(3AgNO_(3)+PH_(3)toAg_(3)P+3HNO_(3)):}}"Precipitation"` |
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| 738. |
Which of the following form of interhalogen compounds does not exist ?A. `IF_(7)`B. `ClF_(3)`C. `ICl`D. `BrCl_(7)` |
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Answer» Correct Answer - D Chlrine , being only a slightly stronger oxidising agent then bromine cannot oxidise it to +7 oxidation state is is required for the formation of the compound `BrCl_7`. |
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| 739. |
The hybrid state of Br in `BrF_5` isA. `sp^3 d `B. `sp^3 d^2`C. `sp^3`D. `dsp^2` |
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Answer» Correct Answer - B `sp^3d^2` hybridisation and it has square pyramidal shape |
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| 740. |
T-shaped interhalogen compounds isA. `ClF_(3)`B. `ICl `C. `ClF_(5)`D. `IF_(5)` |
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Answer» Correct Answer - A `ClF_3` , where Cl is ` sp^(3)`d-hybridised , has a T-shape structure due to the presence of two ions pairs of electorons on Cl-atom . |
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| 741. |
Bleaching powder is an example ofA. a double saltB. a complex saltC. an acidic saltD. a mixed salt |
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Answer» Correct Answer - D Bleaching powder is considered as a mixed salt of hydrochloric acid and hypochlorous acid |
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| 742. |
Which of the following is known as spirit of salt?A. HBrB. HIC. `H_2SO_4`D. HCl |
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Answer» Correct Answer - C HCl is known as spirit of salt while `H_2SO_4` is called king of chemicals |
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| 743. |
which one of the following mixed sulphates is not an alum?A. `K_(2)SO_(4).Al_(2)(SO_(4))_(3).24H_(2)O`B. `K_(2)SO_(4).Cr_(2)(SO_(4))_(3).24H_(2)O`C. `Na_(2)SO_(4).Fe_(2)(SO_(4))_(3).24H_(2)O`D. `CuSO_(4).Al_(2)(SO_(4))_(3).24H_(2)O` |
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Answer» Correct Answer - D `CuSO_(4).Al_(2)(SO_(4))_(3).24H_(2)O` |
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| 744. |
which of the following compounds are formed when boron trichloride is treated with water?A. `H_(3)BO_(3)+HCl`B. `B_(2)H_(6)+HCl`C. `B_(2)O_(3)+HCl`D. none of these |
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Answer» Correct Answer - A `BC Cl_(3)+3H_(2)OtoH_(3)BO_(3)+3HCl` Except `BF_(3)` all trihalides are readily hydrolysed by water. |
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| 745. |
Which statement is not true about potas alum?A. Its empirical formula os `Kal(SO_(4))_(2).12H_(2)O`B. It is used in dyeing industriesC. Its aqueous solution is basic in natureD. On heating it melts and loses its water of crystallization |
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Answer» Correct Answer - C Alum forms acidic solution on dissolution in water due to hydrolysis of `Al^(3+)` ions. |
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| 746. |
Which is true for an element `R` present in `13 th` group of the perodic table?A. It forms an oxide of the type `R_(2)O_(3)`B. It has an oxidation state of `+4`C. It is gas at room temperatureD. It forms a halide of the type `RX_(2)` |
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Answer» Correct Answer - A Group `IIIA` or group `13` elements have `ns^(2)np^(1)` configuration. |
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| 747. |
`H_(2)S` on incomplete combustion with oxygen forms mainlyA. `H_(2)` and `S`B. `H_(2)` and `SO_(2)`C. `H_(2)O` and `S`D. `H_(2)O` and `SO_(2)` |
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Answer» Correct Answer - C On incomplete combustion sulpher is formed. `2H-(2)S+O_(2)rarr2H_(2)O+2S` |
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| 748. |
In the reacton `HCOOH overset(H_(2)SO_(4))(rarr)CO+H_(2)O,H_(2)SO_(4)` actss as `a//an`A. Dehydrating agentB. Oxidising agentC. Reducing agentD. all of these |
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Answer» Correct Answer - A Only dehydrating agent `HCOOHoverset(H_(2)SO_(4))(rarr)CO+H_(2)O` |
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| 749. |
`HCOOH underset(conc. H_(2)SO_(4)) overset(373K) rarr H_(2)O+(X)` `C(s)+H_(2)O overset(423-1273K) rarr (X)+H_(2)(g)` Select the correct statement about (X):A. (X) gas is estimated by `I_(2)O_(5)`B. `Cu_(2)Cl_(2)` is abosrber of (X) gasC. (X) gas is the purifier agent for NiD. All of the above |
| Answer» Correct Answer - D | |
| 750. |
`HCOOH underset(conc. H_(2)SO_(4)) overset(373K) rarr H_(2)O+(X)` `C(s)+H_(2)O overset(423-1273K) rarr (X)+H_(2)(g)` In a second reaction when air is used instead of steam a mixture of (X) gas and `N_(2)` is produced which is called:A. water gasB. synthesis gasC. producer gasD. carbon dioxide gas |
| Answer» Correct Answer - C | |