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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.
| 601. |
There is no `S-S` bond inA. `S_2O_4^(2-)`B. `S_2O_5^(2-)`C. `S_2O_3^(2-)`D. `S_2O_7^(2-)` |
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Answer» Correct Answer - D In `S_2O_7^(2-)`, there is no S-S bond. `[-O-undersetundersetO(||)oversetoverset(O)(||)S-O-undersetunderset(O)(||)oversetoverset(O)(||)S-O^(-)]^(2-)` In it there is S-O-S bond .In all other given ionic compounds we find S-S bond . `underset(S_2O_4^(2-))([-O-oversetoversetO(||)S-oversetoversetO(||)S-O-])^(2-) underset(S_2O_5^(2-))([-O-undersetunderset(O)(||)oversetoverset(O)(||)S-oversetoverset(O)(||)S-O-]^(2-))` `underset(S_2O_3^(2-))([-O-undersetunderset(O)(||)oversetoverset(O)(||)S-O-]^(2-))` |
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| 602. |
Moderate electrical conductivity is shown byA. silicaB. graphiteC. diamondD. None of the above |
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Answer» Correct Answer - B |
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| 603. |
Three-centre two-electron bonds are present inA. `NH_(3)`B. `B_(2)H_(6)`C. `BCl_(3)`D. `AlCl_(3)` |
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Answer» Correct Answer - B `B_(2)H_(6)` has two `3c-2e` bonds. |
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| 604. |
In diborane, the number of electrons that account for bonding in the bridges isA. sixB. twoC. eightD. four |
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Answer» Correct Answer - D There are four electrons in two bridges. |
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| 605. |
The structureof diborane `(B_(2)H_(6))` containsA. four `2c-2e` bonds and two `3c-2e` bondsB. two `2c-2e` bonds and four `3c-2e` bondsC. two `2c-2e` bonds and four `3c-3e` bondsD. four `2c - 2e` bonds and four `3c-2e` bonds |
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Answer» Correct Answer - A `B_(2)H_(6)` has four `2c-2e` and two `3c-2e` bonds. |
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| 606. |
The product/s formed when diborane is hydrolysedA. `B_(2)O_(3)` and `H_(3)BO_(3)`B. `B_(2)O_(3)` onlyC. `H_(3)BO_(3)` and `H_(2)`D. `H_(3)BO_(3)` only |
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Answer» Correct Answer - C `B_(2)H_(6) + 6 H_(2)O rarr 2 H_(3)BO_(3) + 6 H_(2)` |
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| 607. |
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 oxide.D. washing soda reacts with `Al` to from soluble aluminate |
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Answer» Correct Answer - C Washing soda reacts with `Al` to from insoluble aluminium oxide. |
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| 608. |
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 aluminium to form insoluble oxide.D. Washing soda forms soluble meta aluminate. |
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Answer» Correct Answer - D `2Al+Na_(2)CO_(3)+3H_(2)Orarr2NaAlO_(2)+CO_(2) +3H_(2)` Sod. Meta aluminate (soluble) |
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| 609. |
Boric acid is an acid because its moleculeA. contians replaceable `H^(+)` ionsB. give up aprotonC. accepts `OH^(-)` from water releasing protonD. combines with proton from water molecule |
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Answer» Correct Answer - C is the correct answer |
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| 610. |
Boric acid is an acid because its moleculeA. contains replaceable `H^(+)` ionB. gives up a protonC. accepts `OH^(-)` from water releasing protonD. combines with proton from water molecule. |
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Answer» Correct Answer - C Boric acid can be considered as an acid because Its molecule accepts `OH^(-)` from water. Releasing proton. `underset("Acid")(H_(3)BO_(3))+underset("Base")(H_(2)O)hArrunderset("base")underset("Conjugate")(B(OH)_(4)^(-))+underset("acid")underset("Conjugate")(H^(+))` Remember in the given options to the question. (a), (b) and (c) are correct as all of these sentenes have more or less similar meaning but here (c ) option is the most appropriate one as it gives complete explanation of the fact that how boric acid can be combined with an acid. |
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| 611. |
Boric acid is an acid because its moleculeA. contains replaceable `H^(+)` ion.B. gives up a protonC. accepts `OH^(-)` ion from water by releasing protonD. combines with proton from water molecule. |
| Answer» Correct Answer - C | |
| 612. |
Borax is not used:A. As a syptic to stop bleedingB. In making enamel and pottery glassesC. As a flux in solderingD. In making optical glass. |
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Answer» Correct Answer - A Borax cannot stop bleeding as it cannot coagulate blood. |
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| 613. |
Atomic no. of N is 7, the atomic no. of IVth member of nitrogen family will beA. 23B. 51C. 33D. 43 |
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Answer» Correct Answer - B `IV^(th)` member will be in 5th period. `therefore` Atomic number `=overset"II"7+overset"III"8+overset"IV"18+overset"V"18 =51` |
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| 614. |
`NH_(2)CONH_(2)+2H_(2)Orarr….A….` `hArr2NH_(3)+H_(2)O+....B....` In the above equation, A and B respectively areA. `(NH_(4))_(2)CO_(3)" and "CO_(2)`B. `(NH_(4))_(2)CO_(3)" and "CO`C. `(NH_(4))CO_(3)" and "CO`D. `(NH_(4))CO_(3)" and "CO_(2)` |
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Answer» Correct Answer - A `NH_(2)CONH_(2)to(NH_(4))_(2)CO_(3)` `iff 2NH_(3)+H_(2)O+CO_(2)` |
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| 615. |
Complete the following reactions: `I.underset((Excess))(8NH_(3))+3Cl_(2)rarrI` `II.underset((Excess)) (NH_(3)+3Cl_(2)rarrII` |
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Answer» Correct Answer - A (I)` underset((" Excese"))8NH_(3) + 3Cl_(2) to 6NH_(4)Cl+ N_(2)` (II) `NH_(3)+ underset (("Exces"))3Cl_(2) to NCl_(3)+ 3HCl` |
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| 616. |
Consider the following statements, I. Covalency of N is restricted to four. II. N cannot from `dpi-ppi` bond as the heavier element can. III. P and As cannot form `dpi-dpi` bond with transition elements when their compound like `P(C_(2)H_(5))_(3)" and "As(C_(6)H_(5))_(3)` act as ligands. Which of the above statements are true?A. I and IIB. II and IIIC. I and IIID. All of these |
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Answer» Correct Answer - A P and As from `dpi-dpi` bond with transition elemnts when their compounds like `P(C_(2)H_(5))` and `As (C_(6)H_(5))` act as lingands. |
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| 617. |
Complete the following reactions. `6Li+..1....overset(Heat)rarr2Li_(3)N` `3Mg+N_(2)overset(Heat)rarrII` `N_(2)(g)+3H_(2)(g)overset(773K)hArr...III...,triangle_(f)H^(@)=-46.1 KJ Mol^(-1)` Here, I, Iiand III refer toA. `{:(,I,II,III),(,N_(2),Mg_(3)N_(2),NH_(3)):}`B. `{:(,I,II,III),(,2N_(2),Mg_(3)N,NH_(3)):}`C. `{:(,I,II,III),(,2N_(2),Mg_(3)N,2NH_(3)):}`D. `{:(,I,II,III),(,N_(2),Mg_(3)N_(2),2NH_(3)):}` |
| Answer» Correct Answer - D | |
| 618. |
Which of the following statements is incorrect?A. White phosphorus is metastable while red phosphorus is tableB. White phosphorus is lighter than red phosphorusC. White phosphorus is highly poisonous while red phosphorus is notD. |
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Answer» Correct Answer - A Red phosophours is less reactive than white phosphours. |
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| 619. |
What are the oxidation states of phosphorus in the following ? `"Na"_(3)"PO"_(4)` |
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Answer» `"Na"_(3)"PO"_(4)` `3(1)+x+4(-2)=0` `x=+5` |
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| 620. |
how are alums prepared? |
| Answer» Correct Answer - An aqueous solution containing equimolar amount of `Al_(2)(SO_(4)) "and" K_(2)SO_(4)` crystallises as alums. | |
| 621. |
What are pseudo alums ? |
| Answer» Correct Answer - Double disulphate of divalent ions and trivalent ion with 24 water molecules in their crystals are known as pseudo alums. | |
| 622. |
`[SiF_(6)]^(2-)` is a well known compound but `[SiCl_(6)[^(2-)` is not. Explain. |
| Answer» Silicon (Si) atom is not in a position to hold six atoms of chlroine (Cl) dut to their large size. However, it can hold six atoms of flurine (F) wich are comparatively of small size. Apart from that, fluorine, being highly electronegative (4-0) can cause the pronotion of electrons being filled orbtials to the vacant orbitals, Chlorine being less electronegative (3-0) is not in a position to do so. | |
| 623. |
What is the nature aqueous solution of alums ? |
| Answer» Correct Answer - Acidic due to cationic hydrolysis of trivalent cation. | |
| 624. |
`Na_(2)S_(2)O_(3)+I_(2)rarr` Product isA. `Na_(2)S`B. `NaI`C. `Na_(2)S_(4)O_(6)`D. `S_(2)` |
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Answer» Correct Answer - C,B `2Na_(2)S_(2)O_(3)+I_(2)rarr2Nal+Na_(2)S_(4)O_(6)`. |
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| 625. |
The least soluble halogen in water isA. `F_2`B. `I_2`C. `Cl_2`D. `Br_2` |
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Answer» Correct Answer - B `I_2` cannot decompose water as well as it does not readily dissolve in water. |
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| 626. |
The solubility of the halogen in water increases by addition of its salt. To which halogen does this statement applyA. `F_2`B. `I_2`C. `Cl_2`D. `Br_2` |
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Answer» Correct Answer - B Solubility of iodine in water increases by the addition of KI due to the formation of `KI_3` |
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| 627. |
Iodine dissolves readily inA. Water is a good conduter of electricityB. Potassium iodideC. Carbon tetrachlorideD. Alcohol |
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Answer» Correct Answer - B `KI+I_(2)tounderset(("soluble complex"))(KI_(3))` |
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| 628. |
Which of the following statement is true regardin g electrolysis of molten ICl ?A. `I_2` is liberated at the cathodeB. `Cl_2` is liberated at the cathodeC. `I_2` is liberated at the anodeD. Both `I_2` and `Cl_2` are liberated at the anode |
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Answer» Correct Answer - A `IC l to I^(+) + Cl^-` liberated at anode. |
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| 629. |
Aqua regia is a mixture ofA. `HBr`B. `HI`C. `HCl `D. `HF` |
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Answer» Correct Answer - C Aqua regia is `1` part of `HNO_(3)` and `3` part of `HCl`. |
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| 630. |
Which of the following has the highest value of dipole movement?A. HFB. HCIC. HBrD. HI |
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Answer» Correct Answer - A HF, as diff. in electronegativity of H and F is maximum |
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| 631. |
A mixture of sand and iodine can be separated byA. dissolving in water and filteringB. fractional crystallizationC. adding dil HCl solutionD. sublimation |
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Answer» Correct Answer - D Iodine will sublime, sand will not sublime , hence can be separated. |
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| 632. |
Which of the following statements is not true?A. `HF` is a stronger acid than `HCl`B. Among halide ions, iodide is the most powerful reducing agentC. Fluorine is the only halogen that does not show a varible oxidation stateD. `HOCl` is a stronger acid than `HOBr` |
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Answer» Correct Answer - A `HF` is a weak acid due to intermoleculer hydrogen bonding. |
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| 633. |
Which of the following does not form precipitate with `AgNO_3` ?A. HFB. HClC. HBrD. HI |
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Answer» Correct Answer - A HF gives no ppt since AgF is formed which is soluble in water. Other give ppt with `AgNO_3` |
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| 634. |
Which of the following reagents produce `ClO_2` ?A. `Cl_2 + HgO to `B. `Cl_2 + O_2 to `C. `NaClO_3 + I_2 to `D. `NaClO_3 + SO_3 + H_2SO_4 to ` |
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Answer» Correct Answer - D `NaClO_3 + SO_3 + H_2SO_4 to 2ClO_2 + 2NaHSO_4` |
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| 635. |
on exciting `Cl_(2)` molecule by `UV` light, we getA. `Cl`B. `Cl^(+)`C. `Cl^(-)`D. All |
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Answer» Correct Answer - A `Cl-Cloverset("ultraviolet")to underset("Free radical")(Cl+Cl)` |
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| 636. |
What is true out of the following ?A. Fluorine reduces water to oxygenB. Fluorine neutralises wateC. Fluorine oxides water to form `O_3` and `O_2`D. Fluorine does not react with water |
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Answer» Correct Answer - C `2F_2+H_2O to 4HF + O_2 , 3F_2 + H_2O to 6HF + O_3` |
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| 637. |
Which of the following does not form precipitate with `AgNO_3` ?A. HFB. HCIC. HBrD. HI |
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Answer» Correct Answer - A HF forms water soluble AgF |
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| 638. |
Which oxide of halogen is formed when `HIO_3` is heated at `170^(@)C` ?A. `I_2O_3`B. `I_2O_5`C. `I_2O_7`D. `I_2O_4` |
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Answer» Correct Answer - B `2HIO_3 to I_2O_5 + H_2O` |
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| 639. |
Iodine is liberated from KI solution when treated with :A. `ZnSO_(4)`B. `CuSO_(4)`C. `NiSO_(4)`D. `FeSO_(4)` |
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Answer» Correct Answer - B |
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| 640. |
Which of the following oxygen compound is not called oxide ?A. `OF_2`B. `Cl_2O_7`C. `ClO_2`D. `BrO_2` |
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Answer» Correct Answer - A `OF_2` is oxygen difluoride because fluorine is more electronegative than oxygen. |
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| 641. |
Which of the following is a pseudohalide ion ?A. `(CN)_2`B. `(SCN)_2`C. `N_3^-`D. Both (a) and (b) |
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Answer» Correct Answer - C Electronic structure of `N_3^-` is same as `X^-` |
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| 642. |
The tendency to form the anion `X^(-)` is greatest withA. FluorineB. BromineC. IodineD. Chlorine |
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Answer» Correct Answer - D F has maximum electronegativity. |
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| 643. |
Which halogen oxidises water to liberate oxygen exothermally?A. `F_2`B. `Cl_2`C. `Br_2`D. `I_2` |
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Answer» Correct Answer - A `2H_2O + 2F_2 to 4HF +O_2, 3H_2O + 3F_2 to 6HF + O_3` `F_2` react with water to form `O_2` and reaction is exothermic |
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| 644. |
Fluorine is obtained by the interaction of `K_2MnF_6` with Lewis acid `SbF_5` because of the :A. Acidolysis of `MnF_4`B. Decomposition of `MnF_4`C. Ionization of `MnF_4`D. Decomposition of `SbF_6` |
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Answer» Correct Answer - B |
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| 645. |
The manufacture of fluorine is done byA. heating anhydrous HF and `MnO_(2)`B. electrolysis of aqueous HFC. electrolysis of anhydrous HF mixed with `KHF_(2)`D. heating a mixture of KF, `MnO_(2)` and conc. `H_(2)SO_4` |
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Answer» Correct Answer - C |
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| 646. |
Which halogen oxidises water to liberate oxygen exothermally ?A. fluorineB. chlorineC. bromineD. iodine |
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Answer» Correct Answer - A |
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| 647. |
Which of the following on hydrolysis will give dibasic acid ?A. `PCl_(5)`B. `PCl_(3)`C. `BCl_(3)`D. `SiCl_(4)` |
| Answer» Correct Answer - B | |
| 648. |
A sulphate of a metal (A) on heating evolves two gases (B) and ( C) and an oxide (D). Gas (B) turns `K_(2)Cr_(2)O_(7)` paper green while gas ( C) forms a trimer in which there is no `S-S` bond. Compound (D) with HCl, forms a Lewis acid (E ) which exists as a dimer. Compounds (A), (B), ( C),(D) and (E) are respectively:A. `FeSO_(4),XO_(2),SO_(3),FeO_(3),FeCl_(3)`B. `Al_(2)(SO_(4))_(3),SO_(2),SO_(3),Al_(2)O_(3),FeCl_(3)`C. `FeS,SO_(2),SO_(3),FeSO_(4),FeCl_(3)`D. `FeS,SO_(2),SO_(3),Fe_(3)(PO_(4))_(2),FeCl_(2)` |
| Answer» Correct Answer - A | |
| 649. |
Which of the following is incorrect for `H_(3)BO_(3)`A. It is a strong tribasic acidB. It is prepared by acidifying an aqeous solution of boraxC. It has a layer structure in which planar `BO_(3)` units are joined by hydrogen bondsD. It does not act as proton donor but acts as a Lewis acid by accpeting hydroxyl ion |
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Answer» Correct Answer - A Boric acid `(H_(3)BO_(3))` is a weak monobasic acid with `K_(a) = 1.0 xx 10^(-9)`. It may be noted that boric acid does not act as a protonic acid (i.e, proton donor) but behaves s a Lewis acid by accepting a pair of electrons from `OH^(-)` ion. `B(OH)_(3) + 2H - O - H rarr [B(OH)_(4)]^(-) + H_(3)O^(+)` |
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| 650. |
Which diagram is correct for `(9)/(4)` oxygen shared per tetrahedra?A. B. C. D. |
| Answer» Correct Answer - A | |