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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.
| 1601. |
Ammonia gas can be dried byA. Conc. `H_2SO_4`B. `PCl_5`C. `CaCl_2`D. Quick lime |
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Answer» Correct Answer - D For drying , quick lime is used as it does not react with ammonia but reacts readily with moisture |
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| 1602. |
Lead pipes are not suitable for drinking water because :A. a layer of lead dioxide is deposited over pipesB. lead forms basic lead carbonateC. lead reacts with water containing air to form `Pb(OH)_(2)`D. lead reacts with air to form litharge |
| Answer» Correct Answer - C | |
| 1603. |
Water transported through lead pipes becomes poisonous due to the formation ofA. `Pb(OH)_(2)`B. `PbO`C. `PbO_(2)`D. `Pb_(3)O_(4)` |
| Answer» Correct Answer - A | |
| 1604. |
Lead pipes are corroded quickly byA. `dil.H_(2)SO_(4)`B. `Conc. H_(2)SO_(4)`C. acetic acidD. water |
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Answer» Correct Answer - C Organic acids dissolve lead in presence of oxygen `Pb+2CH_(3)COOH+1/2O_(2)toPb(CH_(3)COO)_(2) +H_(2)O` |
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| 1605. |
Which of the following pair will give chlorine gas most quickly, upon reaction ?A. `HCl and KMnO_4`B. `NaCl and H_3PO_4`C. `NaCl and MnO_2`D. `CaCl_2 and Br_2` |
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Answer» Correct Answer - A |
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| 1606. |
What are the products formed in the reaction of xenon hexafluoride with silicon dioxide?A. `XeSiO_4 + HF`B. `XeF_2+SiF_4`C. `XeOF_4+SiF_4`D. `XeO_3+SiF_2` |
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Answer» Correct Answer - C |
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| 1607. |
Repeated use of which one of the following fertilizers would increase the acidity of the soil?A. UreaB. Superphosphate of limeC. Ammonium sulphateD. Potassium nitrate |
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Answer» Correct Answer - C The fertilizer ammonium sulphate is a salt of weak base and strong acid, thus its aqueous solution is acidic, so it produces acidity. |
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| 1608. |
A gas does not turn lime water milky, supports the combustion of burning magnesium. It has no smell and is colourless. It exitiingusher magnesium. It has no smell and is colourless. It exitingushes a glowing splint but under some circumstances reacts with oxygen and hydrogen. It is not poisonous. The gas is likely to be:A. nitrogenB. water vapourC. carbon dioxideD. helium |
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Answer» Correct Answer - A These are characterstics of `N_(2)` |
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| 1609. |
Give the equations for preparation of : (A)Nitrolim. (B)Phosphine by `P_(4)` and `I_(2)(aq)` |
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Answer» Correct Answer - (A)`CaO+3C overset(2800-2900^(@)C)toCaC_(2)+CO; CaC_(2)+N_(2) underset(6-8 "atm")overset(500-600^(@)C)to ubrace(CaCN_(2)+C)_("Nitrolism")` (B)`P_(4)+2l_(2)+8H_(2)Oto2PH_(4)l+2Hl + 2H_(3)PO_(4)` `PH_(4)l + NaOH to PH_(3) + Nal+ H_(2)O` |
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| 1610. |
Substances burn more readily in `N_(2)O` than in air because `N_(2)O`:A. is reactive at high temperatureB. dissociates to give more oxygen than in air.C. the activation energy is increased on increasing temperatureD. acts as a catalyst |
| Answer» Correct Answer - B | |
| 1611. |
Nitrolim is obtained by passing nitrogen over:A. heated mixture of `Al_(2)O_(3)` and carbonB. carborundumC. calcuim carbideD. heated aluminium |
| Answer» Correct Answer - C | |
| 1612. |
In `Al_(2)Cl_(6)`, I. six Al-cl bonds are of same length and two of different length. II. The angle Al-Cl-Al is `87^(@)`. III. Four Al-Cl bonds are of the same length and two of different length. IV. The angle Cl-Al-Cl is `93^(@)`Cand `110^(@)`A. I,II and IIIB. II,III and IVC. I,III and IVD. I,II and IV |
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Answer» (b) The structure of `Al_(2)Cl_(6)` is shown below |
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| 1613. |
All the `Al-Cl` bonds in `Al_(2)Cl_(6)` are equivalent. |
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Answer» Correct Answer - F |
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| 1614. |
The colour imparted by `Co(II)` compound to glass isA. GreenB. Deep blueC. YellowD. Red |
| Answer» Correct Answer - B | |
| 1615. |
Living in the atmosphere of `CO` is dangerous because itA. Reduces organic matter of tissuesB. Dries up the bloodC. Combines with haemoglobin of blood and makes it incapable to absorb oxygenD. Combines with `O_(2)` present to from `CO_(2)` |
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Answer» Correct Answer - C Combines with haemoglobin of blood and makes it incapable to absorb oxygen. |
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| 1616. |
Which of the following statements is incorrect for aluminium chloride (`Al_(2)Cl_(6)`) ?A. It exists as a dimer in solvents like benzene and carbon disulphidesB. The aluminium atom is tetrahederally surrounded by four chloride atomsC. Each aluminium atom forms three covalent bonds and one coordinate bondD. In the vapour state, aluminium chloride does not exist as a dimer |
| Answer» Correct Answer - (d) | |
| 1617. |
Which variety of glass is used for manufactured of optical glasses?A. Sodium glassB. Flint glassC. Ground glassD. Quartz |
| Answer» Correct Answer - B | |
| 1618. |
which of the following statements is not correct?A. `Al` is ionic in all compoundsB. `Al` does not react with steam even at higher temperatureC. `Al` forms a number of alloyes with other metalsD. `Al` acts as a reducing agent |
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Answer» Correct Answer - A `Al` too from covalent compounds, e.g. `AlCl_(3)`. |
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| 1619. |
The main factor responsible for waek acidic nature of `B-F` bonds in `BF_(3)` isA. `ppi-ppi` back bondingB. `ppi-dpi` back bondingC. three centred-two electron bonds in `BF_(3)`D. large electronegitivity of F |
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Answer» (a) it is `ppi-ppi` bonding involving B and F-atom responsible for the acidic nature halides as `BF_(3)ltBCl_(3)ltBBr_(3)ltBl_(3)` Smaller, atom shows more back bonding |
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| 1620. |
Percipation of `Al^(3+)` (aq) as `Al(OH)_(3)` by `CO_(2)` shows that:A. the acidic property is very weakB. the acidic property is very strongC. the basic property is very strongD. the basic property is very weak |
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Answer» Correct Answer - A `CO_(2)+H_(2)O hArrCO_(2)^(3-)+2H^(+)` `2Al^(3+)+3CO_(3)^(2-)+3H_(2)Oto2Al(OH)_(3)+3CO_(2)` |
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| 1621. |
The main factor responsible for waek acidic nature of `B-F` bonds in `BF_(3)` isA. large electronagativity of `F`B. `p pi-ppi` back bondingC. `p pi-p pi` back bondingD. three centred two electron bonds in `BF_(3)` |
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Answer» Correct Answer - B It is `ppi-ppi` bonding involving `B` and `F` atoms responsible for the acidic |
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| 1622. |
Methanides are:A. `Mg_(2)C_(3),Be_(2)C,Al_(4)C_(3)` and `CaC_(2)`B. `Mg_(2)C_(3),Be_(2)C` and `Al_(4)C_(3)`C. `Be_(2)C,Al_(4)C_(3)` and `CaC_(2)`D. `Be_(2)C` and `Al_(4)C_(3)` |
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Answer» Correct Answer - D Methanides give `CH_(4)` on reaction with `H_(2)O`. `{:(Al_(4)C_(3)+12H_(2)Oto4Al(OH)_(3)+3CH_(4)),(Be_(2)C+4H_(2)Oto2Be(OH)_(2)+CH_(4)):}` |
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| 1623. |
`CO` is an unsaturated compound in which valency of carbon isA. `1`B. `2`C. `3`D. `4` |
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Answer» Correct Answer - B `C-O O^(-2)` `x=+2` |
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| 1624. |
Difference between diamond and graphite is due to:A. graphite combines with oxygen to form carbon dioxide but diamond does notB. the crystal structure in diamond is different from that in graphiteC. the atoms each have different massesD. all of the above |
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Answer» Correct Answer - B Diamonds has tetrahadral structure (`sp^(3)`-hybridization). Graphite has flat layer structure `(sp^(2))` |
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| 1625. |
Which of the following statements are correct ? (a) All the three N___O bond lengths in `HNO_(3)` are equal. (b) All P___Cl bond lengths in `PCl_(5)` molecule in gaseous state are equal (c ) `P_(4)` molecule in white phosphrus have angular strain therefore white phosphorus is very reactive (d) `PCl_(5)` is ionic in solid state in which cation is tetrahedral and anion is octahedral . And anion is octahedral. |
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Answer» Correct Answer - C::D (a) All the three N__O bond lengths in `HNO_(3)` are not equal. (b) All P___Cl bond lengths in `PCl_(5)` molecule in gaseous state are not equal. Axial bond is longer than equatorial bond. (c ) `P_(4)` molecule in white phosphorous have angular strain therefore white phosporous is very reactive. (d) `PCl_(5)` is ionic in soild state in which cation is tetrahedral and anion is octahedral. Cation - `[PCl_(4)]^(+)` Anion - `[PCl_(6)]^(-)` |
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| 1626. |
Which of the following orders are correct as per the properties mentioned against ? (a) `As_(2)O_(3)ltSiO_(2)ltP_(2)O_(3)SO_(2)` Acid strength. (b) `AsH_(3)ltPH_(3)ltNH_(3)` Enthalpy of vaporisation. (c )`SltOltClltF` More negative electron gain enthalphy. (d) `H_(2)OgtH_(2)SgtH_(2)SegtH_(2)Te` Thermal stability. |
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Answer» Correct Answer - A::D (a) `underset("acidic strength increases")overset(As_(2)O_(3)ltSiO_(2)ltP_(2)O_(3)ltSO_(2))to` (b) Correct order is `underset("enthalphy of vaporization")overset(AsH_(3)gtPH_(3)gtNH_(3))to` (c ) `SltOltClltF` More negative electron gain enthalpy (d) `H_(2)OgtH_(2)SgtH_(2)SegtH_(2)Te` Thermal stability decreases on movind top to botten due to increase in its bond length. |
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| 1627. |
When steam is passed through red hot coke:A. `CO_(2)` and `H_(2)` are obtainedB. `CO` and `N_(2)` are formedC. `CO` and `H_(2)` are obtainedD. petrol gas is obtained |
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Answer» Correct Answer - C `C("red hot")+H_(2)O("steam")toCO+H_(2)` Equimolar mixture of `CO` and `H_(2)` is called as water gas. |
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| 1628. |
When a mixture of air and steam is passed over red hot coke, the outgoing gas is:A. producer gasB. water gasC. coal gasD. none of these |
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Answer» Correct Answer - A When air is passed over red hot coke, producer gas is produces. `2C+O_(2)+N_(2)overset(Delta)to2CO+N_(2)` Producer gas is essentially a mixture of `CO` and `N_(2)` |
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| 1629. |
What are the oxidation states of phosphorus in the following ? `"POF"_(3)` |
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Answer» `"POF"_(3)` `x+(-2)+3(-1)=0` `x=+5` |
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| 1630. |
When conc. `H_(2)SO_(4)` was teated with `K_(4)[Fe(CN)_(6)]`, CO gas was evolved. By mistake, somebody used dilute `H_(2)SO_(4)` instead of conc.`H_(2)SO_(4)` then the gas evolved wasA. COB. HCNC. `N_(2)`D. `CO_(2)` |
| Answer» Correct Answer - B | |
| 1631. |
`H_(3)BO_(3) overset(T_(1))rarrXoverset(T_(2))rarrY overset("red hot")rarrB_(2)O_(3)` if temperature `T_(1) lt T_(2)` then X and Y respectively are :A. X=Metaboric acid and Y=Tetraboric acidB. X=Tetraboric acid and Y= Metaboric acidC. X=Borax and Y=Metaboric acidD. X=Tetraboric and Y=Borax |
| Answer» Correct Answer - A | |
| 1632. |
Borax is prepared by treating coleminate withA. `Na_(2)CO_(3)`B. `NaCl`C. `NaNO_(3)`D. `NaHCO_(3)` |
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Answer» Correct Answer - A `Ca_(2)B_(6)O_(11)+2Na_(2)CO_(3)to2CaCO_(3)darr+Na_(2)B_(4)O_(7)+2NaBO_(2)` |
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| 1633. |
Electrolytic reduction of alumina to aluminium by Hall-Heroult process is carried out:A. in the presence of `NaCl`B. in the presence of fluoriteC. in the presence of cryolite which forms a melt with lower melting temperatureD. in the presence of cryolite which forms a melt with lower melting temperature |
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Answer» Correct Answer - C Addition of crolite makes the fuse melt at lower melting temperature as well as good conductor of current. |
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| 1634. |
Electrolytic reduction of alumina to aluminium by Hall-Heroult process is carried out:A. in the presence of `NaCl`B. `in the presence of fluoriteC. in the presence of cryolite which forms a melt with higher melting temperatureD. in the presence of cryolite which forms a melt with lower melting temperature |
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Answer» Correct Answer - D Addition of crolite makes the fuse melt at lower melting temperature as well as good conductor of current. |
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| 1635. |
which one of the following salts will evolve halogen on treatment with conc. `H_(2)SO_(4)` ?A. NaClB. KIC. NaBrD. none of these |
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Answer» Correct Answer - BC |
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| 1636. |
Iodine reacts with hypo to giveA. NalB. `Na_(2)SO_(3)`C. `Na_(2)S_(4)O_(6)`D. `Na_(2)SO_(4)` |
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Answer» Correct Answer - AC |
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| 1637. |
Which has the strongest bond?A. `I_(2)gtIClgtHI ltHIO_(4)`B. `HIO_(4) lt ICl lt I_(2)ltHI`C. `I_(2)ltHIltIClltHIO_(4)`D. `Hilt I_(2)ltICl ltHIO_(4)` |
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Answer» Correct Answer - D `underset(-1)(HI) lt underset(0)(I_(2)) lt underset(+1)(ICI) lt underset(+7)(HIO_(4))` |
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| 1638. |
Which has the stongest bond?A. `F-F`B. `F-Cl`C. `F-Br`D. `Cl-B` |
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Answer» Correct Answer - A `F-F` more strong bond compare to `F-Cl, F-Br` and `Cl-Br` bond. |
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| 1639. |
Iodine and hypo react to produceA. `Na_(2)S`B. `Na_(2)SO_(4)`C. `Na_(2)S_(4)O_(6)`D. `Na_(2)SO_(3)` |
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Answer» Correct Answer - C `2Na_(2)S_(2)O_(3)+I_(2)rarrNa_(2)S_(4)O_(6)+2NaI`. |
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| 1640. |
One gas bleaches the colour of flowers by reduction and other by oxidation. These gases areA. `NO` and `Vl_(2)`B. `CO_(2)` and `Cl_(2)`C. `SO_(2)` and `Cl_(2)`D. `H_(2)S` and `Br_(2)` |
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Answer» Correct Answer - C `Cl_(2)` bleaces by oxidation while `SO_(2)` does it by redution. |
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| 1641. |
A certain salt `(X)` gives the following tests : (a) Its aqueous solution is alkaline to litmus. (b) On strong heating. It sweels to give a glassy bead. ( c) When conc `H_(2) SO_(4)` is added to a hot concentrated solution of `(X)`, white crystals of a weak acid separates out. Identify `(X)` and write down the chemical equations for reaction at steps `a, b` and `c`.A. VioletB. BlueC. BrownD. White |
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Answer» Correct Answer - D `(X)` is borax, `Na_(2)B_(4)O_(7).1 H_(2)O`. (i) `Na_(2)B_(4)O_(7)+7H_(2)O hArr underset(("strong base"))(2NaOH)+underset(("Weak acid"))(4H_(3)BO_(3))` Due to present of `NaOH`, the aqueous solution is alkaline to litmus. (ii) `Na_(2)B_(4)O_(7).10H_(2)to2NaBO_(2)+underset("Glassy bead")B_(2)O_(3)` (iii) `Na_(2)B_(4)O_(7)+H_(2)SO_(4)+5H_(2)OtoNa_(2)SO_(4)underset("White crystals")4H_(3)BNO_(3)` |
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| 1642. |
Which one of the following is a pseudohalide ?A. (A) `CNO^-`B. (B) `RCOO^-`C. (C) `OCN^-`D. (D) `N N N^-` |
| Answer» Correct Answer - B | |
| 1643. |
The mixture of concentrated `HCl` and `HNO_(3)` made in `3:1` ratio containsA. `ClO_(2)`B. `NOCl`C. `NCl_(3)`D. `N_(2)O_(4)` |
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Answer» Correct Answer - B `3HCl+HNO_(3)rarrNOCl+2H_(2)O+Cl_(2)`. |
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| 1644. |
Which one below is a pseudohalideA. `CN^(-)`B. `ICl`C. `IF_(5)`D. `I_(3)^(-)` |
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Answer» Correct Answer - A Pseudohalide ions and Pseudohalogens. There are certain monovalent negative ions made up of two or more electronegative atoms which exhibit properties similar to those of halide ions. Such ions are known as pseudohalide ions have also corresponding dimeric molecules. These are called pseudohalogens and show prperties similar to those of halogens. `{:("Pseudohalide","Pseudohalogens"),(CN^(-)"cyanide",(CN)_(2)"Cyanogen"),(SCN^(-)"Thiocyanogen",(SCN)_(2)"THiocyanogen"):}` |
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| 1645. |
Beilstein test is used forA. `N_(2)`B. `Cl`C. `Na`D. `CO_(2)` |
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Answer» Correct Answer - B Beilstein test-In this test organic compound is heated on a copper wite in a flame. The appearance of a green or bluish green flame due to the formation of volatile cupric halides indicate the presence of halogens in the organic compound. (It does not tell which halogen is actually present). |
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| 1646. |
Write any two oxidation and any two reduction properties of ozone with equations. |
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Answer» Oxidation properties : 1. Ozone oxidises moist potassium idodide and liberates `I_(2)`. `2KI+H_(2)O+O_(3)to2KOH+I_(2)+O_(2)` 2. Ozone oxidises black lead lead sulphide to white lead sulphate. `PbS+4O_(3)toPbSO_(4)+4O_(2)` Reduction properties : 1. Ozone reduces `H_(2)O_(2)` to `H_(2)O" "H_(2)O_(2)+O_(3)to H_(2)O+2O_(2)`. 2. Ozone reduces `Ag_(2)O" to Ag. "Ag_(2)O+O_(3)to2Ag+2O_(2)` |
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| 1647. |
Which one is the highest melting halide ?A. `NaCl`B. `NaBr`C. `NaF`D. `Nal` |
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Answer» Correct Answer - C `NaF` is highest melting halide because it is most ionic in nature. |
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| 1648. |
How is chlorine prepared in the laboratory ? How does it react with the following ? Iron |
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Answer» In the laboratory chlorine is prepared by the oxidation of HCl with `MnO_(2)`. `4" HCl"+"MnO"_(2)to"MnCl"_(2)+2" H"_(2)O+Cl_(2)uarr` `Cl_(2)` reacts with Iron to form `FeCl_(3)` `2" Fe"+3Cl_(2)to2" FeCl"_(3)` |
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| 1649. |
When `I_(2)` is dissolved in `C Cl_(4)`, the colour that results isA. brownB. violetC. colourlessD. bluish green |
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Answer» Correct Answer - B `2NaI+Cl_(2)rarr2KCl+I_(2)` `C Cl_(4)+I_(2)rarr`violet colour |
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| 1650. |
Hydrogens bonding does not play any role in boiling ofA. `NH_(3)`B. `H_(2)O`C. `HI`D. `C_(2)H_(5)OH` |
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Answer» Correct Answer - C Hydrogen bonding is absent in `HI` while it is present in `NH_(3),H_(2)O` and `C_(2)H_(5)OH`. |
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