Saved Bookmarks
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.
| 651. |
Which of the following is strongest acid ?A. HIB. HBrC. HClD. HF |
|
Answer» Correct Answer - A HI is the strongest acid because H-I bond is weakest bond and donates `H^(+)` vary easily . |
|
| 652. |
Radioactive inert gas is :A. technetiumB. radonC. xenonD. curium |
| Answer» Correct Answer - B | |
| 653. |
Name the type of structure of silicated in which one oxygen atom of `[SiO_(4)]^(4-)` is shared ?A. Linear chain silicateB. Sheet silicateC. PyrosilicateD. Three dimensional |
|
Answer» Correct Answer - C Pyrosilicate contains one oxygen atom giving `(Si_(2)O_(7))^(6-)` anion. |
|
| 654. |
Questions given below are based on electronic configurations of the elements. The three elements X,Y and Z with the electronic configuration shown below all form hydrides: Which line of properties (A,B,C or D) correctly lists properties of the hydrides of there elements?A. `{:(" Hydride of X","Hydride of Y","Hydride of Z"),(" Colourless gas insoluble in "H_(2)O,"Silver/grey solid, react with "H_(2)O " to form an alkaline solution", "Colourless gas form a strong acid in" H_(2)O):}`B. `{:(" Hydride of X","Hydride of Y","Hydride of Z"),(" Colourless liquid no reaction with "H_(2)O,"Silver/grey solid, form "H_(2)O ," Ionic solid with formula ZH"):}`C. `{:(" Hydride of X","Hydride of Y","Hydride of Z"),(" Colourless gas found naturally","Does not conduct electricity in the molten state" ,"Colourless gas reacts with " Cl_(2)):}`D. `{:(" Hydride of X","Hydride of Y","Hydride of Z"),("Non-polar compound reacts with "Cl_(2) " in light","Silver/grey ionic solid with formula "YH_(2) ,"Form when water is added to phosphrous and element Z"):}` |
| Answer» Correct Answer - A | |
| 655. |
Which of the following is formed by xenon ?A. `XeF_(7)`B. `XeF_(4)`C. `XeF_(5)`D. `XeF_(5)` |
|
Answer» Correct Answer - B `XeF_2 , XeF_4,XeF_6` are formed by xenon. |
|
| 656. |
Questions given below are based on electronic configurations of the elements. The three elements X,Y and Z with the electronic configuration shown below all form hydrides: Which of the following exists as gas ?A. `X_(2)`B. `Y_(2)`C. `Z_(2)`D. All of these |
| Answer» Correct Answer - C | |
| 657. |
Which one of the following configurations represents a noble gas?A. `1s^(2)2s^(2)p^(6),3s^(2)`B. `1s^(2)2s^(2)p^(6),3s^(1)`C. `1s^(2)2s^(2)p^(6)`D. `1s^(2)2s^(2)p^(6),3s^(2)p^(6),4s^(2)` |
|
Answer» Correct Answer - C |
|
| 658. |
Which of the following is not correct for noble gas?A. Ar is used in electric bulbsB. Kr is obtained during radioactive disintegrationC. Half life of Rn is 3.8 daysD. Helium is used to produce low temperature |
|
Answer» Correct Answer - B Rn is obtained not Kr |
|
| 659. |
Noble gas which forms interstitial compounds with metals isA. heliumB. argonC. neonD. xenon |
|
Answer» Correct Answer - A Only he forms interstitial compounds since , the atomic size of He is smallest and matches the size of the interstices available is the lattice of most of the heavy metals. |
|
| 660. |
Which of the following is monoatomic?A. NitrogenB. FluorineC. NeonD. Oxygen |
|
Answer» Correct Answer - C Neon : Ne is monoatomic and others `(N_(2),F_(2) "and" O_(2))` are diatomic. |
|
| 661. |
Which one of the following configurations represents a noble gas?A. `1s6(2),2s^(2)2p^(6),3s^(2)`B. `1s^(2),2s^(2),2p^(6),3a^(1)`C. `1s^(2),2s^(2),2p^(6)`D. `1s^(2),2s^(2),2p^(6),3s^(2),3p^(6),4s^(2)` |
|
Answer» Correct Answer - C `1s^(2),2s^(2),2p^(6):` Neon |
|
| 662. |
The forces acting between noble gas atoms areA. Vander waals forcesB. Ion -dipole forcesC. London - dispersion forcesD. Magnetic forces |
|
Answer» Correct Answer - A Stable configuration of octet |
|
| 663. |
The noble gas which forms maximum number of compound isA. `Ar`B. `He`C. `Xe`D. `Ne` |
|
Answer» Correct Answer - C `XeF_(2),XeOF_(2),XeF_(4),XeOF_(4),XeF_(6),XeO_(3)`. |
|
| 664. |
Which of the following is not correct about xenon hexafluoride?A. It has oxidation state of +6B. The hybridisation involved in `XeF_6` is `sp^3d^3`.C. The shape of `XeF_6` is distorted octahedral and can be represented as D. On hydrolysis it gives Xe, HF and `O_2` |
|
Answer» Correct Answer - D On hydrolysis the products formed are `XeO_3` and HF `XeF_6 + 3H_2O to XeO_3 + 6HF` |
|
| 665. |
Among the fluorides below, the one which does not exist isA. `XeF_(4)`B. `HeF_(4)`C. `SF_(4)`D. `CF_(4)` |
|
Answer» Correct Answer - B `HeF_(4)` does not exist. |
|
| 666. |
The electronic configuration of neon isA. `1s^(2),2s^(2),2p^(2)`B. `1s^(2),2s^(2),2p^(6)`C. `1s^(2),2s^(2)`D. `1s^(2)` |
|
Answer» Correct Answer - B `Ne_(10):1s^(2),2s^(2),2p^(6)` |
|
| 667. |
The coloured discharge tubes for advertisement mainly containsA. HeB. NeC. ArD. Kr |
|
Answer» Correct Answer - B For advertisement the coloured discharge tubes contains Ne . |
|
| 668. |
Which of the following represents noble gas configuration?A. `1s^(2),2s^(2)2p^(6),3s^(2)3p^(6)3d^(10),4s^(2)4p^(6)4d^(10),5s^(2),5p^(6)5d^(6),6s^(2)`B. `1s^(2),2s^(2)2p^(6),3s^(2)3p^(6)3d^(10),4s^(2)4p^(6)4d^(10),5s^(2),5p^(6)5d^(1),6s^(2)`C. `1s^(2),2s^(2)2p^(6),3s^(2)3p^(6)3d^(10),4s^(2)4p^(6)4d^(10),5s^(2)5p^(6)`D. `1s^(2),2s^(2)2p^(6),3s^(2)3p^(6)3d^(10),4s^(2)4p^(6)4f^(14),5s^(2)5p^(6)5d^(1)` |
|
Answer» Correct Answer - C Option (c) has noble gas configuration as it has 8 electrons in valence shell . |
|
| 669. |
The noble gas used in atomic reactors isA. kryptonB. oxygenC. neonD. helium |
|
Answer» Correct Answer - D In atomic reactors , helium gas is used . |
|
| 670. |
The inert gas producing miximum number of compounds areA. He and NeB. Ar and NeC. Kr and NeD. Ar and Xe |
|
Answer» Correct Answer - D The inert gases producing maximum number of compounds are Ar (argon) and Xe (xenon ) due to their low ionisation energy . |
|
| 671. |
Which is the most easily liquifiable rare gasA. `Xe `B. KrC. ArD. Ne |
|
Answer» Correct Answer - A Xe is most easily liquifiable rare gas because interatomic interactions increases with increasing atomic number . |
|
| 672. |
The inert gases areA. PolyatomicB. TriatomicC. DiatomicD. Monoatomic |
|
Answer» Correct Answer - D All the noble gases are monoatomic, colourless and odourless gases. Their monotomic nature is due to the stable outer configuration `ns^(2),np^(6)` of their atoms. As a result, they do not enter into chemical combination even amongst themselves. |
|
| 673. |
Which of the following gases `is//are` called rare gas?A. `Ne`B. `He`C. `Kr`D. All of these |
|
Answer» Correct Answer - D He, `Ne,` and `Kr` all are found in very little amount in atmoshphere, so all are called rare gases. |
|
| 674. |
Identify A,B,C and D in the following reactaions: Bauxite+Charcoal+Chlorine `overset("heat")rarrA+CO` `A+H_(2)OhArrB+HCl` `B+H_(2)SO_(4)hArrC+H_(2)O` `B+NaOHhArrD+H_(2)O` Complete the reactions: |
|
Answer» `Al_(2)O_(3)+3C+3Cl_(2)overset("Heat")rarr2AlCl_(3)+3CO` `AlC l_(3)+3H_(2)OhArrAl(OH)_(3)+3HCl` `Al(OH)_(3)+ 3H_(2)SO_(4)hArrAl_(2)(SO_(4))_(3)+3H_(2)O` `Al(OH)_(3)+NaOH HArrNaAiO_(2)+2H_(2)O` |
|
| 675. |
Among the fluorides below, the one which does not exist isA. `XeF_4`B. `HeF_4`C. `SF_4`D. `CF_4` |
|
Answer» Correct Answer - B He - `1s^2` cannot form four covalent bond |
|
| 676. |
What is the total number of electron present in the last orbit of argon?A. `6`B. `2`C. `18`D. `8` |
|
Answer» Correct Answer - D `Ar_(18):2,8,8` |
|
| 677. |
The last orbit of argon would have electronsA. 8B. 18C. 2D. 6 |
| Answer» Correct Answer - A | |
| 678. |
Argon possess_________ energy.A. TranslationalB. VibrationalC. RotationalD. Intermolecular |
|
Answer» Correct Answer - A Noble gases posses translational motion and translational energy |
|
| 679. |
The charcoal maintained at`-100^(@)C` absorbsA. Ne and KrB. He and ArC. Ar, Kr and XeD. He and Ne |
|
Answer» Correct Answer - C Ar, Kr and Xe are absorbed by charcoal at `-100^@C` |
|
| 680. |
Monazite is a source ofA. He and NeB. KrC. ArD. Xe |
|
Answer» Correct Answer - A He and Ne are found in radioactive minerals like monazite |
|
| 681. |
Which property is common in diamond and graphite?A. Electrical conductivityB. Crystal structureC. Relative atomic massD. Density |
|
Answer» Correct Answer - B Relative atomic mass. Both diamond and graphite have atomic mass `=12`. |
|
| 682. |
Which is not the property of diamond?A. it is insoluble in all solventsB. it is oxidised with a mixture of `K_(2)Cr_(2)O_(7)` and `H_(2)SO_(4)` at `200^(@)C`.C. Being hardest, it is used as an abrasive for sharpening hard tools.D. `Delta_(f)H^(Theta)` value of diamond is `1.90 kJmol^(-1)` |
|
Answer» Correct Answer - B Diamonds is not oxidised by `K_(2)Cr_(2)O_(7)//H_(2)SO_(4)` at `200^(@)C`. |
|
| 683. |
In presence of aluminium chloride, diborane reacts with dry hydrogen chloride forming a substitution productA. Borane dichlorideB. Boron dichlorideC. DichloroboraneD. Chlorodiborane |
|
Answer» Correct Answer - D `B_(2)H_(6)+Hcloverset("Anhy "AlCl_(3))to B_(2)H_(5)Cl+H_(2)` |
|
| 684. |
The form of `BN` which is hard as diamond isA. Cubic form with `ZnS` strucutreB. hexagonal formC. both of theseD. none of these |
|
Answer» Correct Answer - A The cubic form of `BN` with `ZnS` structure is as hard as diamonds. |
|
| 685. |
When alumina is heated with carbon in the atmosphere of nitrogen then product formed areA. `Al+CO`B. `AlN+CO`C. `Al+CO_(2)`D. `Al+CO+N_(2)` |
|
Answer» Correct Answer - B `Al_(2)O_(3).2H_(2)O+3C+N_(2)overset(1800^(@)C)to2AIN+3CO+2H_(2)O` |
|
| 686. |
Give appropriate reasons for each of the following : (a)Addition of `Cl_2` to Kl solution gives a brown colour but excess of `Cl_2` turns it colourless (b)Perchloric acid is a stronger acid than sulphuric acid. ( c)HI can not be prepared by heating Nal with concentrated `H_2SO_4` |
|
Answer» (a)`Cl_2` being a stronger oxidising agent than `I_2`, first oxidises KI to `l_2` which imparts brown colour to the solution.But when `Cl_2` is passed in excess , the `I_2` so formed gets further oxidised to `HIO_3` (colourless) `2KI(aq)+Cl_2(g)to2KCl(aq)+I_2(s), 5Cl_2+I_2+6H_2Oto10HCl+2HIO_3` (b)Oxidation state of Cl in `HCIO_4` is `+7` and that of S in `H_2SO_4` is +6.(Cl is more electronegative than S).As a result, `ClO_(3)` part of `HCIO_4` can break the O-H bond more easily to liberate a proton than `SO_2` part in `H_2SO_4`Thus `HCIO_4` is a stronger acid than `H_2SO_4` ( c)HI is a stronger reducing agent It, therefore, reduces `H_2SO_4` to `SO_2` and itself gets oxidised `l_2` `Nal+H_(2)SO_(4)toNaHSO_(4)+HI]xx2` `H_(2)SO_(4)+2HItoSO_(2)+l_(2)+2H_(2)O` `overline(2Nal+3H_2SO_4toSO_2+l_2+ 2H_2O+SO_2` |
|
| 687. |
Which of the following halogen does not exhibit positive oxidation state in its compounds?A. `Cl`B. `Br`C. `I`D. `F` |
|
Answer» Correct Answer - D Fluorine does not gives positive oxidation state it is always show `-1` oxidation state. |
|
| 688. |
Do `(CH_(3))_(3)N` and `(Me_(3)Si)_(3)` have similar structure ? Justify your answer . |
| Answer» `(CH_(3))_(3) N` is pyramidal involving `sp^(3)`-hybridization of N atom. Nitrogen in `(Me_(3)Si)_(3)N` is, however, `sp^(2)`-hybridized. The reason being that the p-orbital of N containing the lone pair of electrons overlop with a vacant d-orbital of silicon. As a result of this `ppi-dpi` back bonding, `(Me_(3)Si)_(3)N` is planar. Thus, `(CH_(3))_(3)N` and `(Me_(3)Si)_(3) N` are not isostructural . For structure. | |
| 689. |
Which statement is not correct for nitrogen?A. it is obtained by heating `(NH_(4))_(2)Cr_(2)O_(7)`B. It does not readily react with `O_(2)`C. It is a typical non-metalD. `d`-orbitals are available for bonding |
| Answer» Correct Answer - D | |
| 690. |
Nitrogen is obtained by the thermal decomposition of :A. `NH_(4)Cl`B. `NH_(4)NO_(3)`C. `AgNO_(3)`D. none of these |
|
Answer» Correct Answer - D `NH_(4)Cl` gives `NH_(3),NH_(4)NO_(3)` gives `N_(2)O` and `AgNO_(3)` gives `NO_(2)`. (A)`NH_(4)Cl overset(Delta)toNH_(3)+HCl` (B)`NH_(4)NO_(3)overset(Delta) to N_(2)O+2H_(2)O` ( C)`AgNO_(3) overset(Delta)to Ag+NO_(2)+1//20_(2)` |
|
| 691. |
Maximum number of compounds are formed byA. HeB. NeC. ArD. Xe |
|
Answer» Correct Answer - D Xenon forms maximum number of compounds due to its lowest ionisation energy . He , Ne and Ar do not form compound. |
|
| 692. |
The noble gases found dissolved in spring water areA. argon and heliumB. neon and argonC. krypton and xenonD. xenon and radon |
|
Answer» Correct Answer - C Occurrence of noble gases , spring water - Krypton , Xenon |
|
| 693. |
Which one of the following noble gas is obtained by radioactive disintegration ?A. HeB. NeC. ArD. Rn |
|
Answer» Correct Answer - D Radon (Rn), at no. 86 is the only noble gases which is radio active |
|
| 694. |
Amorphous boron on burning in air formsA. `B(OH)_(3)`B. Mixture of `B_(2)O_(3)` and `BN`C. Only `B_(2)O_(3)`D. Only `BN` |
|
Answer» Correct Answer - B `{:(4B+3O_(2)overset(1173 K)to 2B_(2)O_(3)),(2B(s)+N_(2)(g)overset(1173 K)to 2BN(s)):}` |
|
| 695. |
Which of the following cannot liberate `H_(2)` with acids?A. `Al`B. `B`C. `Ti`D. `In` |
|
Answer» Correct Answer - B Boron does not react with acids. |
|
| 696. |
Boron reacts with nitric acid to fromA. Sodium borate `H_(2)`B. Boric acidC. DiboraneD. Borax |
|
Answer» Correct Answer - B `B+3HNO_(3)tounderset("Boric acid")(H_(3)BO_(3))` Boron remains unaffected by nonoxidising acids |
|
| 697. |
The reaction taking place at the cathode in the aluminium extraction isA. `Al^(3+)+3e^(-)toAl`B. `6F^(-)to3F_(2)+6e^(-)`C. `Al_(2)O_(3)+3F_(2)to2Al^(3+)+3//2O_(2)`D. `C_((s))+2O_(2)^(2-)toCO_(2)(g)+4e^(-)` |
|
Answer» Correct Answer - A At cathode `Al^(3+)+3e^(-)toAl` |
|
| 698. |
Calgon (a water softener) is :A. Sodium hexametaphosphateB. Sodium phosphateC. Copper sulphateD. Arsenic sulfide |
|
Answer» Correct Answer - A Sodium hexametaphosphate is Calgon |
|
| 699. |
On heating `KCIO_(3)` we get :A. `KCIO_(2)+O_(2)`B. `KCI+O_(2)`C. `KCl+O_(3)`D. `KCl+O_(2)+O_(3)` |
|
Answer» Correct Answer - B |
|
| 700. |
Which of the following has highest bond strength :A. HIB. HClC. HFD. HBr |
|
Answer» Correct Answer - C |
|