InterviewSolution
Saved Bookmarks
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.
| 451. |
Which of the following is not a linear molecule ?A. `CO_(2)`B. `BeCl_(2)`C. `CS_(2)`D. `SO_(2)` |
| Answer» Correct Answer - D | |
| 452. |
The catalyst used for the manufacture of `H_2SO_4`, in contact process for the oxidation of `SO_2" to "SO_3` isA. finely divided ironB. molybdenumC. nitric oxideD. vanadium pentaoxide |
| Answer» Correct Answer - D | |
| 453. |
Which of the following statements is incorrect ?A. Helium has the lowest boiling point among the elementsB. Helium is obtained from the decay of radioactive elementsC. Liquid helium has almost zero viscosityD. Helium is a combustible gas |
| Answer» Correct Answer - D | |
| 454. |
The forces of cohesion in liquid helium areA. covalentB. ionicC. none of theseD. vander Waals |
| Answer» Correct Answer - C | |
| 455. |
The ratio of specific heat at constant pressure to specific heat at constant volume `(i.e. C_p//C_V)` for noble gases isA. 1.66B. 1.33C. 1.42D. 1.83 |
| Answer» Correct Answer - A | |
| 456. |
Which of the following statements is true ?A. Argon forms covalent compounds with fluorineB. Argon forms clatharate compounds with quinol?C. `XeF_8` is formed by coordination between Xe and `F_(2)`D. `XeF_4` has a tetrahedral structure |
| Answer» Correct Answer - B | |
| 457. |
Noble gases areA. monoatomicB. diatomicC. triatomicD. polyatomic |
| Answer» Correct Answer - A | |
| 458. |
The noble gas which used as a coling agent isA. HeB. NeC. RnD. Xe |
| Answer» Correct Answer - A | |
| 459. |
The electronic configuration of krypton isA. `[He]2s^(2)2p^(6)`B. `[Ne] 3s^(2) 3p^(6)`C. `1s^(2)`D. `[Ar]3d^(10) 4s^(2) 4p^(6)` |
| Answer» Correct Answer - D | |
| 460. |
Which electronic configuration belongs to an element of group 16?A. `[He] 2s^(2)2p^(2)`B. `[Ne]^(2) 3s^(2) 3p^(4)`C. `[Ar] 3d^(5) 4s^(1)`D. `[Ar] 3d^(10) 4s^(2) 4p^(6)` |
|
Answer» Correct Answer - B Group 16th element have `ns^(2) np^(4)` configuration of outermost shell (valence-shell). |
|
| 461. |
`FeSO_(4)` forms brown ring withA. NOB. `N_2O_3`C. `NO_2`D. `N_2O_5` |
| Answer» Correct Answer - A | |
| 462. |
Which of the following has minimum H-M-H bond angle?A. `NH_(3)`B. `PH_(3)`C. `AsH_(3)`D. `SbH_(3)` |
| Answer» Correct Answer - D | |
| 463. |
The tota number of P-O bonds in `P_(4)O_(10)` isA. 17B. 16C. 15D. 6 |
|
Answer» Correct Answer - B 16 bond by its structure. |
|
| 464. |
Sulphur molecule isA. diatomicB. tetratomicC. octatomicD. None of the above |
| Answer» Correct Answer - C | |
| 465. |
Bond angle is minimum forA. `H_(2)O`B. `H_(2)S`C. `H_(2)Se`D. `H_(2)Te` |
|
Answer» Correct Answer - D `{:(,H_(2),H_(2)S,H_(2)Se,H_(2)Te),(,104.5^(@),92.1^(@),91^(@),90^(@)):}` As we go down the goup electronegativity decreases due to which repulsion between bonded pairs of electron also decreases. |
|
| 466. |
The element which catches fire in air at `30^@C` and is stored under water isA. CalciumB. SodiumC. PhosphorusD. Zinc |
|
Answer» Correct Answer - C Because of its very low ignition temperature (303K) it is always kept under water. |
|
| 467. |
The element which forms oxides in all oxidation states ` +1 ` to `+5` is.A. NB. PC. AsD. Sb |
|
Answer» Correct Answer - A Nitrogen shows +1 to +5, all oxidation states. |
|
| 468. |
Oxygen molecule exhibitsA. ParamagnetsismB. DiamagnetismC. FerromagnetismD. Ferrimagnetism |
|
Answer» Correct Answer - A Paramagnetism because of two unpaired electrons in the antibonding molecular orbitals. |
|
| 469. |
The smog is essentially caused by the presence of `:`A. Oxides of sulphur and nitrogenB. `O_(2) and N_(2)`C. `O_(2) and O_(3)`D. `O_(3) and N_(2)` |
|
Answer» Correct Answer - A Photochemical smog is caused by oxides of sulphur and nitrogen. |
|
| 470. |
Nitrogen forms how many oxidesA. 3B. 4C. 5D. 6 |
|
Answer» Correct Answer - C (i) `underset("Colourless gas")underset("Nitric gas")(NO)` (ii) `underset("Colourless less")underset("Nitrous oxide")(N_(2)O)` (iii) `underset("blue liquid")underset("tetraoxide")underset("Dintrogen") (N_2O_3)` (iv) `underset("blue liquid")underset("tetraoxide")underset("Dintrogen")(N_2O_4` `underset("white solid")underset("pentaoxide")underset("Dintrogen")(N_2O_5)` |
|
| 471. |
Oxides of sulphur and nitrogenA. `H_(2)S`B. `H_(2)Te`C. `H_(2)Se`D. `H_(2)O` |
|
Answer» Correct Answer - D All hydrides except H0 acts as reducing agents, The reducing nature increases as the atomic number of the central atom increases. This is due to weakening of M-H bond as the bond length increases with increase in size of sulphur and nitrogen. |
|
| 472. |
Oxygen is not evolved on reaction of ozone withA. `H_(2)O_(2)`B. `SO_(2)`C. `Hg`D. KI |
|
Answer» Correct Answer - B Ozone on treatment with `SO_(2)` produce `SO_3`. `3SO_(2)+O_(3) to 3SO_(3)`. |
|
| 473. |
Which mixture is used for respiration by deep sea divers?A. `He+O_(2)`B. `Ne+O_(2)`C. `Kr+O_(2)`D. `Xe+O_(2)` |
| Answer» Correct Answer - A | |
| 474. |
Which of the following is amphoteric oxideA. `CO_(2)`B. `Al_(2)O_(3)`C. `N_(2)O`D. NO |
| Answer» Correct Answer - B | |
| 475. |
Transition temperature between rhombic and monoclinic sulphur isA. `26^(@)C`B. `95.6^(@)C`C. `70^(@)C`D. `100^(@)C` |
| Answer» Correct Answer - B | |
| 476. |
`Na_(2)B_(4)O_(7).10H_(2)O` is correctly represent byA. `2NaBO_(2).Na_(2)B_(2)O_(3).10H_(2)O`B. `Na_(2)[B_(4)O_(5)(OH)_(4)].8H_(2)O`C. `Na_(2)[B_(4)(H_(2)O)_(4)O_(7)].6H_(2)O`D. None of these |
| Answer» Correct Answer - B | |
| 477. |
Which of the following is an indian salt petre?A. NaClB. `NaNO_(3)`C. KClD. `KNO_(3)` |
| Answer» Correct Answer - D | |
| 478. |
In which of the following four P-OH bonds are present ?A. `H_(4)P_(2)O_(6)`B. `H_(3)PO_(2)`C. `H_(3)PO_(3)`D. `H_(4)P_(2)O_(5)` |
| Answer» Correct Answer - A | |
| 479. |
When a small amount of HCl is added to an aqueous solution of `BiCl_(3)`, a white precipitate is formed. This is due toA. `Bi(OH)_(3)`B. `Bi_2O_3`C. `BiOCl`D. none of the above |
|
Answer» Correct Answer - C `BiCl_3`, being the salt of a strong acid and weak base, undergoes partial hydrolysis under weakly acidic conditions to give a white precipitate of BIOCI, which dissolves in the excess of the acid. `BiOCI_(3)+3HOH to underset("ppt".)(BiOCl)+2HCl` `BiOCl+2HCl to BiCl_(3)+H_(2)O` BiOCl is used as a white pigment under the name pearl white. |
|
| 480. |
Smoke screen is produced by usingA. calcium carbideB. calcium phosphideC. phosphorus trisulphideD. All of the above |
| Answer» Correct Answer - B | |
| 481. |
Which one of the following statement regardings `BF_(3)` is not correct ?A. it is a Lewis acidB. it is an ionic compoundC. it is an electron deficient compoundD. it forms adducts |
| Answer» Correct Answer - B | |
| 482. |
What is hybridisation on the central atom of `SiO_(2)`.A. spB. `sp^(2)`C. `sp^(3)`D. `sp^(3)d` |
| Answer» Correct Answer - C | |
| 483. |
On passing `CO_(2)` into aqueous solution containing `NaAlO_(2)`:A. `Al_(2)(CO_(3))_(3)` is formedB. `Al(OH)_(3)` is precipitatedC. `Al_(2)O_(3)` is formedD. collodial `Al(OH)_(3)` is formed |
|
Answer» Correct Answer - B `CO_(2)+H_(2)Oto H_(2)CO_(3) hArrCO_(3)^(2-)+2H^(+)` `3CO_(3)^(2-)+3H_(2)O+2Al^(3+) to 2Al(OH)_(3) darr ("as weakly acidic")+3CO_(2)` |
|
| 484. |
Which of the following is incorrect for `H_(3)BO_(3)`A. It has a layer structre in which `H_(3)BO_(3)` units are joined by hydrogen bondsB. It is obtained by treating borax with conc. `H_(2)SO_(4)`C. It does not act as a proton donor but acts as an lewis acid by accepting hydroxyl ions.D. None of these |
| Answer» Correct Answer - D | |
| 485. |
Solid `CO_(2)` isA. Ionic solidB. Covalent solidC. Molecular solidD. Metallic solid |
| Answer» Correct Answer - C | |
| 486. |
In the following reactions `2X+B_(2)H_(6) to [BH_(2)(X)_(2)]^(+){BH_(4)]^(-)` The amine X will not be -A. `NH_(3)`B. `CH_(3)NH_(2)`C. `(CH_(3))_(2)NH`D. `(CH_(3))_(3)N` |
| Answer» Correct Answer - D | |