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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.
| 401. |
Give reasons : (i) Conc. `HNO_(3)` can be transported in aluminium container. (ii) A mixture of dilute NaOH and aluminium pieces is used to open drain. (iii) Graphite is used as lubricant. (iv) Diamond is used as an abrasive. (v) Aluminium alloys are used to make aircraft body. (vi) Aluminium utensils should not be kept in water overnight. (vii) Aluminium wire is used to make transmission cables. |
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Answer» (i) conc. `HNO_(3)` reacts with aluminium to form aluminium oxide `(Al_(2)O_(3))` which forms a protective coating inside the container. The metal becomes passive and does not react with the acid any more Therefore, the acid can be safely stroed in aluminium container. (ii) Graphie is used as lubricant becaue of its soft and gressy nature. this is probably due to the presence of layers in the arangement of carbon atoms is graphite. (iii) Diamond is used as an abraisve because of its extremely hard nature (hardest substance known). Actually, the carbon atoms in diamond are very closely packed. this is responsible. for the harddness of diamond. (iv) Alloys of aluminium: Manalium and Duralumin both of which contain about 95% of the metal are used for making aircraft body. Actually, both of them are light. tough and quite resistant to currosion. Therefore, they are used in making bodies of air crafts. (v) Althoughthe metal as such is not affected by water, but when kept overnight, it may be slowly affected by moisture in the presence of oxygen (air). `2Al(s)+O_(2)(g)+H_(2)O(l)rarrAl_(2)O_(3)(s)+H_(2)(g)` (vi) The metal is not affected by air and moisture (resistat to corrosion) and also because of its good conductivity. it is used to make tramission cables. |
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| 402. |
How many of the following compounds will decolourize the colour of acidified ` KMnO_(4)`? `{:(H_(2)S,FeSO_(4),NaNO_(2)),(Na_(2)SO_(3),PbS,Na_(2)S),(NaNO_(3),Na_(2)SO_(4),CO_(2)),(SO_(3),P_(2)O_(5),):}` |
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Answer» Correct Answer - `0006` `H_(2)S,FeSO_(4),NaNO_(2),Na_(2)SO_(3),PbS,Na_(2)S` |
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| 403. |
Consider the compounds given below: (P) `BiCl_(3)` (Q) `SbCl_(3)` (R ) `VCl_(5)` (S) `AlCl_(3)` Which would form oxo ion of `MO^(+)` type when subjected to hydrolysis?A. P,Q,R onlyB. P,Q,S onlyC. P,Q onlyD. P,Q,R,S |
| Answer» Correct Answer - C | |
| 404. |
How do you account for the inert character of dinitrogen ? |
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Answer» Di Nitrogen is chemically inert. Explanation : In nitrogen molecule there exists a triple bond between two nitrogen two nitrogen atoms. To break this triple bond high energy (bond dissociation energy) is required (941.4 KJ/mole). |
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| 405. |
White phosphorous may be removed from red phosphorus by :A. sublimationB. distillationC. heatingD. heating with an alkali solution |
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Answer» Correct Answer - D Red phosphorus is inert towards sodium hydroxide but white phosphorus reacts according to following reaction. `P_(4)+3NaOH+3H_(2)O to PH_(3)+3NaH_(2)PO_(2)` |
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| 406. |
Maximum covalency of nitrogen is ………. .A. 3B. 5C. 4D. 6 |
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Answer» Correct Answer - C N at the maximum can have 8 electrons, i.e., four pairs of electronos in the valence shell and hence has a maximum covalency of 4. |
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| 407. |
Which of the following is planar?A. `B_(2)H_(6)`B. `Fe_(2)Cl_(6)`C. `FeCl_(4)^(-)`D. `PtCl_(4)^(2-)` |
| Answer» Correct Answer - D | |
| 408. |
Which is planar molecule ?A. `XeO_4`B. `XeF_4`C. `XeOF_4`D. `XeO_2F_2` |
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Answer» Correct Answer - B `XeF_4` is square planar molecule |
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| 409. |
When `AgNO_(3)` is heated strongly, the products fomed areA. `NO` and `NO_(2)`B. `NO_(2)` and `O_(2)`C. `NO_(2)` and `N_(2)O`D. `NO` and `O_(2)` |
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Answer» Correct Answer - B `2AgNO_(3)rarrunderset(2Ag+2NO_(2))underset(darr)(2AgNO_(2)+O_(2)` |
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| 410. |
Which of the following statements is true for `HNO_(2)`?A. It can be prepared by acidifying an aqueous solution of nitrite.B. It is unstable weak acid which is known only in aqueous solution.C. `N_(2)O_(3)` is an anhydride of `HNO_(2)`.D. All of these |
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Answer» Correct Answer - D (A)`Ba(NO_(3))_(2)+H_(2)SO_(4) to 2HNO_(2)+BaSO(4)darr` (B) It is unstable, weak acid which is known only in aqueous solution. (C ) `2HNO_(2) to N_(2)O_(3)+H_(2)O` |
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| 411. |
On heating lead nitrate forms oxides of nitrogen and lead. The oxides formed are :A. `N_(2)O,PbO`B. `NO_(2),PbO`C. `NO,PbO`D. `NO,PbO_(2)` |
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Answer» Correct Answer - B `2Pb(NO_(3))_(2)overset(Delta)to2PbO+4NO_(2)+O_(2)` |
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| 412. |
Which of the following compound(s) is /are planar about nitrogen?A. `N(SiH_(3))_(3)`B. `N(SiH_(3))_(2)(BF_(2))`C. `N(BF_(2))_(3)`D. `overset(..)(N)(CH_(3))_(3)` |
| Answer» Correct Answer - A::B::C | |
| 413. |
In modern proces, while phosphorus is manufacured by :A. heating a mixture of phosphorus mineral with sand and coke in an electric furnaceB. heating calcium phosphours with limeC. heating bone ash with cokeD. heating phosphate mienral with sand. |
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Answer» Correct Answer - A White phophorus is obtained by heating a mixture of phosphorus mineral, `Ca_(3)(PO_(4))_(2)` with sand and coke in an electric furnace. `2Ca_(3)(PO_(4))_(2)("from bone-ash" )+10C+6SiO_(2)overset(Delta)to6CaSiO+10CO+P_(4)(s)` |
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| 414. |
What is true about `N _(2)O_(4)`?A. It is mixture `N _(2)O_(3)` and `N _(2)O_(5)`.B. It is absorved by water to form nitric acid.C. it is raddish brown gas.D. It reacts with water to give mixture of two oxoacids of nitrogen. |
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Answer» Correct Answer - D `N_(2)O_(4)+H_(2)O to HNO_(3)+HNO_(2)` |
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| 415. |
Nitrogen dioxide is dissolved in water to produce:A. `HNO_(3)` and `HNO_(2)`B. only `HNO_(3)`C. only `HNO_(2)`D. `HNO_(2)` and `N_(2)` |
| Answer» Correct Answer - A | |
| 416. |
Nitrogen dioxideA. dissolves in water forming nitric acidB. Does not dissolve in waterC. Dissolves in water to form nitrous acid and gives off oxygenD. Dissolves in water to form a mixture of nitrous and nitric acids |
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Answer» Correct Answer - D `2NO_(2)+H_(2)OrarrHNO_(3)+HNO_(2)` |
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| 417. |
Action of concentrated nitric acid `(HNO_(3))` on metallic tin producesA. Stannic nitrateB. Stannous nitrateC. Stannous nitriteD. Meta stannic acid |
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Answer» Correct Answer - D `Sn+conc.4HNO_(3)rarrunderset("meta stannic acid")(H_(2)SnO_(3)+) 4NO_(2)+H_(2)O` |
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| 418. |
Nitrogen dioxideA. dissolve in water forming `HNO_(3)`B. does not dissolve in water.C. dissolves in water to form `HNO_(2)` and gives off `O_(2)`.D. dissolves in water to form a mixture of nitrous and nitric acid. |
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Answer» Correct Answer - D `2NO_(2)+H_(2)Oto HNO_(3)+HNO_(2)` `NO_(2)` dissolves in cold water to give nitric acid and nitrous acid. |
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| 419. |
Action of concentrated nitric not act as a reducing agent ?A. stannous nitriteB. stannous nitrateC. stannic nitrateD. hydrated stannic oxide |
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Answer» Correct Answer - D `Sn+4HNO_(3) tounderset("Hyrated stannic oxide") (H_(2)SnO_(3)+4NO_(2))+H_(2)O` |
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| 420. |
For the elements in group 14 (C to Pb), which property increases with increasing atomic number ?A. Melting pointsB. Covalent radiusC. Magnitude of stable oxidation stateD. Ability to form chains of atoms with themselves |
| Answer» Correct Answer - B | |
| 421. |
Which oxide does not act as a reducing agent?A. `NO`B. `N_(2)O_(4)`C. `N_(2)O`D. `N_(2)O_(5)` |
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Answer» Correct Answer - D `N_(2)O_(5)` is not a reducing agent. In `N_(2)O_(5)`, oxidation state of `N` is `+5` and nitrogen can not increase its oxidation state beyond `5`. |
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| 422. |
Which of the following can act as reducing agent ?A. `Na_(2)S_(2)O_(3)`B. `[Co(NH_(3))_(6)]^(2+)`C. `SO_(2)`D. `PbO_(2)` |
| Answer» Correct Answer - A::B::C | |
| 423. |
Which oxide is the best reducing agent?A. `CO_(2)`B. `NO_(2)`C. `SiO_(2)`D. `SO_(2)` |
| Answer» Correct Answer - D | |
| 424. |
In trimetaphosphate ion, the number of O-atoms, P-O-P bonds and unit negative charges respectively areA. 3, 6 and 3B. 9, 6 and 3C. 6, 6 and 3D. 9, 3 and 3 |
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Answer» Correct Answer - D In trimetaphosphate ion, the number of O-atms, `P-O-P` bonds and units negative charges are 9,3,3 respectively |
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| 425. |
`PCl_3` fumes in moisture becauseA. it undergoes hydrolysis giving fumes of HClB. it has 5 chlorine atomsC. P in `PCl_3` is `sp^3` hybridisedD. Chlorine atom is replaced by hydroxyl group |
| Answer» Correct Answer - A | |
| 426. |
Why does `PCl_(3)` fumes in air ? |
| Answer» Correct Answer - B::C::D | |
| 427. |
The pair of species having identical shapes for molecules of both species isA. `XeF_2, CO_2`B. `BF_3, PCI_3`C. `PF_5, IF_5`D. `CF_4, SF_4` |
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Answer» Correct Answer - A Both `XeF_2` and `CO_2` have a linear structure |
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| 428. |
Complete the following reactions by filling the appropriate choice. `A. 6"XeF"_(4)+12"H"_(2)"O"to4"Xe"+2"XeO"_(3)+(i)+(ii)` `B."XeF"_(6)+3"H"_(2)"O"to(iii)+6"HF"`A. (i)-`F_2` , (ii)-`H_2O` , (iii)-`XeOF_4`B. (i)-`24HF` , (ii)-`3O_2` , (iii)-`XeO_3`C. (i)-`2HF ` , (ii)-`2H_2O` , (iii)-`XeO`D. (i)-`HF` , (ii)-`H_2O` , (iii)-`Xe_2O_3` |
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Answer» Correct Answer - B (A)`6XeF_ 4 + 12H_2O to 4Xe + 2XeO_3 + underset"(i)"(24HF) + underset"(ii)"(3O_2)` (B)`XeF_6 + 3H_2O to underset"(iii)"(XeO_3) + 6HF` |
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| 429. |
Total number of lone pair of electrons in ` XeOF_4` is : |
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Answer» Correct Answer - B In `XeOF_4`, Xe is `sp^3d^2` hybridised and has a lone pair of electrons |
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| 430. |
Artifical gem used for cutting glass isA. graphiteB. diamondC. SiCD. `CaCN_(2)` |
| Answer» Correct Answer - C | |
| 431. |
The geometry and the hybirdisation present about the central atom in `BF_(3)` is :A. linear, `sp`B. trigonal planer, `sp^(2)`C. tetrahadral, `sp^(3)`D. pyramidal, `sp^(3)` |
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Answer» Correct Answer - B Boron atom in `BF_(3)`is `sp^(2)`-hybridised and possesses trigonal planer structure. |
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| 432. |
Specify the coordinate geometry around and hyridilization present about the central atom in `BF_(3)` is:A. `N`: Tetrahedral, `sp^(3)`, `B`: Tetrahedral, `sp^(3)`B. `N:` pyramidal, `sp^(3),B:` pyramidal, `sp^(3)`C. `N:`pyramidal,`sp^(3),B:` Planar, `sp^(3)`D. `N:`Pyramidal, `sp^(3)`, `B:` Tetrahedral `sp^(3)` |
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Answer» Correct Answer - A In complex `[H_(3)NtoBF_(3)]`, both `N` and `B` attains `sp^(3)`-hybridisation and acquires tetrahadral geometry. |
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| 433. |
The nitrogen oxide(s) that contains N-N bond(s) is (are)A. `N_(2)O`B. `N_(2)O_(3)`C. `N_(2)O_(4)`D. `N_(2)O_(5)` |
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Answer» Correct Answer - A::B::C `N_(2)O_(3)andN_(2)O_(4)` contain N-N bonds. |
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| 434. |
Which one of the following ionic species has the greatest proton affinity to form stable compound ?A. `HS^(-)`B. `NH_(2)^(-)`C. `F^(-)`D. `I^(-)` |
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Answer» Correct Answer - C Fluorine is the most electronegative element in the periodic table. So, it has the greatest proton affinity to form stable compounds. |
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| 435. |
Which of the following anions is present in the chain structure of silicates?A. `Si_(2)O_(7)^(6-)`B. `(Si_(2)O_(5)^(2-))_(n)`C. `(SiO_(3)^(2-))_(n)`D. `SiO_(4)^(4-)` |
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Answer» Correct Answer - C `[SiO_(3)^(2-)]_(n)` and `[Si_(4)O_(11)]^(6-)` have chain structure of silicates. |
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| 436. |
`SO_(2)` is obtained whenA. oxygen reacts with dilute sulphuric acidB. Hydrolysis of dilute `H_(2)SO_(4)`C. Hydrolysis of dilute `H_(2)SO_(4)`D. Concentrated `H_(2)SO_(4)` reacts with `Na_(2)SO_(3)` |
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Answer» Correct Answer - C `underset((a))(Na_(2)SO_(3)) + underset((aq))(H_(2)SO_(4)) + underset((aq))(Na_(2)SO_(4)) + underset((l))(H_(2)O) + underset((g))(SO_(2))` |
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| 437. |
Copper turnings when heated with concebtracted sulphuric acid will giveA. `SO_(2)`B. `SO_(3)`C. `H_(2)S`D. `O_(2)` |
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Answer» Correct Answer - A `Cu+2H_(2)SO_(4)rarrCuSO_(4)+2H_(2)O+SO_(2)` |
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| 438. |
Copper turnings when heated with concebtracted sulphuric acid will giveA. `H_2S `B. `O_(2)`C. `SO_(3)`D. `SO_(2)` |
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Answer» Correct Answer - D Copper turnings on heating with conc. `H_2SO_4` produces `SO_2 `. `Cu+underset("conc")(2H_2SO_4)to CuSO_4 +2H_2O+SO_2 ` |
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| 439. |
`SO_(2)+H_(2)S to` Product. The final product isA. `H_(2)O+S`B. `H_(2)SO_(4)`C. `H_(2)SO_(3)`D. `H_(2)S_(2)O_(3)` |
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Answer» Correct Answer - A In the reaction of `SO_(2) and H_2S,SO_2` acts as oxidising agent and `H_2S` acts as reducing agent . `SO_2 + 2H_2S to 2H_2O+3S darr ` |
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| 440. |
Which oxyacid of sulphur contains S-S single bond?A. `H_(2)S_(2)O_(5)`B. `H_(2)S_(2)O_(7)`C. `H_(2)S_(2)O_(8) `D. `Mustard gas |
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Answer» Correct Answer - A Only `H_2S_2O_(6)` (dithionic acid ) contains S-S bond . Its structure is `HO- underset(O)underset(||)overset(O) overset(||)S-underset(O)underset(||)overset(O) overset(||)S-OH` |
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| 441. |
Which of the following is not an oxyacid of chlorine ?A. HCIB. `HCIO_5`C. `HClO_2`D. `HCIO_3` |
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Answer» Correct Answer - A HCl does not contain oxygen. |
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| 442. |
The triple bond between N atoms of nitrogen molecule (N `-=` N) consists ofA. Three `sigma`-bondsB. Two `sigma`-bonds and one `pi`-bondC. One `sigma`-bond and two `pi`-bondsD. Three `pi`-bonds |
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Answer» Correct Answer - C One `sigma` and two `pi` bonds. `(N-=N)` Triple bond |
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| 443. |
The molecule having bond order 3 isA. `H_2`B. `N_2`C. `O_2`D. `He_2^(+)` |
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Answer» Correct Answer - B `:N-=N:` -Three |
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| 444. |
Which of the following structure is correct for `BrF_3`?A. B. C. D. none of these |
| Answer» Correct Answer - C | |
| 445. |
Which one of the following configuration 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 | |
| 446. |
Astatine is the element below iodine in the group `VIIA` of the periodic table. Which of the following statements is not true for astatine?A. It is less electronegative than iodineB. It will exhibit only - 1 oxidation state.C. Intermoleculer forces between the astaine molecules will be larger than that between iodine molecules.D. None of these. |
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Answer» Correct Answer - B |
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| 447. |
Which is Wrong statement?A. (A) Basic nature of X- is in order `F^(-) gt Cl^(-) gt Br^(-) gt I^-`B. (B) Electron gain enthalpy in order F gt Cl gt Brgt I.C. (C) The Ionic character of M—X bond decreases in the order M—F gt M—Clgt M—Brgt M—lD. (D) Among `F^(-) , Cl^(-) , Br^(-) and I^(-) , F^(-)` has the highest enthalpy of hydration. |
| Answer» Correct Answer - B | |
| 448. |
Astatine is the element below iodine in the group `VIIA` of the periodic table. Which of the following statements is not true for astatine?A. (A) It is less electronegative than iodine.B. (B) It will exhibit Only —1 Oxidation state.C. (C) Intermolecular forces between the astatine molecules will be larger than that between iodine molecules.D. (D) None of these. |
| Answer» Correct Answer - B | |
| 449. |
Which of the following is incorrect?A. `ClO_(4)^(-)` has `3dpi-ppi` bondsB. `ClO^(-)` is strong conjugate baseC. `Cl_(2)O_(7)` is most acidic oxideD. `ClO_(3)^(-)` and `NO_3^(-)` are isostructural |
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Answer» Correct Answer - D `ClO_(3)^(-)` has pryamidal while `NO_(3)^(-)` has trigonal planar shape. |
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| 450. |
`HClO_(4),HNO_(3)` and `HCl` are all strong acids in aqueous solution.In glacial acetic acid medium, their acid strength is such that-A. `HClO_(4)gtHClgtHNO_(3)`B. `HNO_(3)gtHClO_(4)gtHCl`C. `HClgtHClO_(4)gtHNO_(3)`D. `HClgtHClO_(4)~~HNO_(3)` |
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Answer» Correct Answer - A In glacial acetic acid `HCl` is strong acid than `HNO_(3)`. Order of acid strength `-HClO_(4)gtHClgtHNO_(3)` |
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