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.
| 401. |
On allowing ammonia solution of s-block metals to stand for a long time, blue colour becomes fade. The reason is:-A. Formation of `NH_(3)` gasB. Formation of metal amideC. Cluster formation of metal ionsD. Formation of metal nitrate |
| Answer» Correct Answer - B | |
| 402. |
Which of the following s-block eleent reacts with `NaOH` to give water soluble complex:-A. `AI`B. `Ca`C. `Be`D. `Li` |
| Answer» Correct Answer - C | |
| 403. |
Dolomite is:-A. `KCI. MgCI_(2).6H_(2)O`B. `CaCO_(3).MgCO_(3)`C. `CaSO_(4).2H_(2)O`D. `MgSO_(4).7H_(2)O` |
| Answer» Correct Answer - B | |
| 404. |
Which is having least mpt:-A. `Ba`B. `Ca`C. `Mg`D. `Be` |
| Answer» Correct Answer - C | |
| 405. |
How many of the following hydroxides is/are amphoteric in character? CsOH , LiOH , `Ca(OH)_(2) , Be(OH)_(2) , Mg(OH)_(2) , Ba(OH)_(2) , Sr(OH)_(2) , Ba(OH)_(2) , KOH , NaOH`. |
|
Answer» Correct Answer - 1 One , `Be (OH)_(2)` |
|
| 406. |
`Ba(OH)_(2)` is used to estimate the amount ofA. `N_(2)`B. `CO_(2)`C. `CO`D. `N_(2)O` |
|
Answer» Correct Answer - B `CO_(2)` is an acidic oxide and , thus, reacts with `Ba(OH)_(2)` to give insoluble `BaCO_(3)`. |
|
| 407. |
`Na_(2)[Be(OH)_(4)]` is formed when:A. `BeO` reacts with `NaOH` solutionB. Be reacts with `NaOH` solutionC. both correctD. None is correct |
| Answer» Correct Answer - C | |
| 408. |
`Na_(2)Be(OH)_(4)]` is formed whenA. `BeO` reacts with `NaOH` solutionB. `Be(OH)_(2)` reacts with `NaOH` solution.C. Both `(a)` and `(b)` are correctD. none of the above is correct. |
|
Answer» Correct Answer - C Both `BeO` and `Be(OH)_(2)` are amphoteric and dissolve in `NaOH` formins soluble `[Be(OH)_(4)]^(2-)`. |
|
| 409. |
What is the formula of basic anhydride of `Ba(OH)_(2)`?A. `Ba_(2)O`B. `BaO`C. `BaO_(2)`D. `Ba` |
|
Answer» Correct Answer - B `Ba(OH)_(2) overset(-H_(2)O)rarr BaO` |
|
| 410. |
Which of the following is not the use of alkali metals .A. White metal , an alloy of lithium and lead is used in manufacture of bearing for motore engines .B. Sodium-lead alloy is used in the preparation tetraethyl lead and anti knocking agent .C. Pottasium chloride is used as fertilizerD. The alkali metals used in photoelectric cells are lithium and sodium . |
|
Answer» Correct Answer - D |
|
| 411. |
Choose the correct order of enthalpy of formation, `DeltaH_(f)^(@)` for halides of alkali metals :A. `NaFltKFltRbFltCsF`B. `NaClgtKClgtRbClgtCsCl`C. `NaBrgtKBrgtRbBrgtCsBr`D. `KFltKClltKBrltKI` |
|
Answer» Correct Answer - A::B::C::D `DeltaH_(f)^(@)` for fluorides become less negative as we go down the group, whilst the reverse is true of `DeltaH_(f)^(@)` for chlorides, bromides and iodides. For a given metal, `DeltaH_(f)^(@)` always becomes less negative from fluride to iodide. |
|
| 412. |
Which of the following statements is wrong about `BCl_(3)` ?A. It contains tetrahedral beryllium unitsB. All the atoms are in same planeC. It contains three centred four electron bondsD. It has polymeric structure |
|
Answer» Correct Answer - B |
|
| 413. |
The wrong statement regarding the solutions of alkali metals in liquid ammoniaA. They are blue coloured because they absorb energy in the visible region .B. They liberate hydrogen on standing resulting in the formation of amide .C. They concentrated solutions of alkali metals in ammonia are bronze coloured .D. Both blue coloured and bronze coloured solutions are paramagnetic in nature . |
|
Answer» Correct Answer - D |
|
| 414. |
The wrong statement among the following regarding alkali metal halides isA. `Deltaf H^(0)` values becomes less negative from lithium to caesiumB. For a given alkali metal `Deltaf H^(0)` is in the order fluoride `gt` chloride `gt` bromide `gt` iodideC. When saturated aqueous solution of LiI and CsF are mixed , LiF and CsI are crystallisedD. Lithium halides have more melting points than sodium halides |
|
Answer» Correct Answer - D |
|
| 415. |
Which of the following statement is incorrect ?A. The atomic radius of `Na` is greater than that of `Mg`B. Metallic bond in `Mg` is stronger than the metallic bond in `Na`C. Melting and boiling points of `Mg` are greater than those of `Ca`D. `Mg` and `Ca` both impart characteristic colour to the flame |
|
Answer» Correct Answer - D `(a)` Along the period, the nuclear charge increases and, therefore, atomic size decreases, So `Na` has larger atomic radius than `Mg`. `(b) Mg` is smaller than `Na` and `Mg` has two valence electrons per atom while `Na` has only one valence electron per atom. So `Mg` has stronger metallic bond than that of `Na(Na` is a soft metal `).` `(c)` Because of stronger metallic bond in `Mg` than `Ca`, boiling and melting point of `Mg` are greater than `Ca`. `(d) Mg` does not impart characteristic colour to the flame because the electrons in `Mg` are too strongly bound to get excited by flame. `Ca` imparts brick red colour to the flame because of its low ionisation enthalpy. |
|
| 416. |
Reduction of sodium nitrite by sodium metal yields:A. `NaO_(2)`B. `Na_(2)O_(2)`C. `Na_(2)O`D. `NaN_(3)` |
|
Answer» Correct Answer - C `2NaNO_(2)+6Na rarr 4Na_(2)O+N_(2)` |
|
| 417. |
Sodium dichormate on heating with coke yields :A. sodium carbonateB. sodium chromiteC. sodium chromateD. chromic anhydride |
|
Answer» Correct Answer - A `Na_(2)Cr_(2)O_(7)+2C overset(Delta)rarr Na_(2)CO_(3)+Cr_(2)O_(3)+CO` |
|
| 418. |
Low solubility of CsI in water is due to :A. smaller hydration enthalpty of `Cs^(+).`B. smaller hydration enthalpy of `I^(-)`C. lower littice enthalpy of its tow ions.D. (1) and (2)both. |
|
Answer» Correct Answer - D |
|
| 419. |
Select correct statementA. Oxides `(M_(2)O)` and peroxides `(M_(2)O_(2))`of alkali metals are diamagnetic and colourlessB. Superoxides `(MO_(2))` of alkali metals are parmagneticC. Li and Na do not form superoxidesD. All are correct |
|
Answer» Correct Answer - D |
|
| 420. |
Which of the hydrrides araea ionic ?A. `CaH_(2)`B. `BaH_(2)`C. `SrH_(2)`D. all the above |
|
Answer» Correct Answer - 4 |
|
| 421. |
Which of the following salts does not form any precipitate with excess of NaOH ?A. `ZnCl_(2)`B. `FeCl_(3)`C. `FeSO_(4)`D. `LiOH |
|
Answer» Correct Answer - A |
|
| 422. |
Excess of intake of sodium causesA. HypertensionB. Lung infectionC. Reduction osteoid tissueD. Atrophy of muscles |
| Answer» Correct Answer - A | |
| 423. |
Which one out of the `NaOH` and `KOH` is a better absorber of `CO_(2)` ?A. `NaOH`B. `KOH`C. both absorb `CO_(2)` equallyD. cannot be predicted |
|
Answer» Correct Answer - B `KOH` is better absorber of `CO_(2)` because `K_(2)CO_(3)` formed is more soluble and does not separate out. |
|
| 424. |
Select the correct statement.A. Among the alkali metals, only lithium reacts witjh nitrogen directly at room temperature of from nitride.B. Among the alkali metal corbonated, `Li_(2)CO_(3)` has the lowest thermal staybility.C. Among the jalkali metal hyderoxide. ChOH has the highest solubility in waterD. All of these |
|
Answer» Correct Answer - D |
|
| 425. |
Daily requirement of KCl is approximatelyA. 1 gB. 10 gC. 4 gD. 8 g |
| Answer» Correct Answer - C | |
| 426. |
Choose the correct statementsA. Except beryllium ,all other alkaline earth metals combine with hydrogen on heating to gorm hydirde `(MH)_(2)`B. BeryLIum hyDride is Covalent in characterC. Magnesium hydride is covalent in characterD. all the above |
|
Answer» Correct Answer - 4 |
|
| 427. |
Select the correct statement(S)A. Chlorophyll conyains magneiumB. In chorlphyll , magnessioum is complexed with pyrrole ring of porphyringC. `MgBr_(2) and mgI_(2)` are soluble in acetoneD. All the above area correct |
|
Answer» Correct Answer - 4 |
|
| 428. |
`BeH_(2)` & `MgH_(2)` are propared using the reagentA. LiHB. `AlH_(3)`C. `LiAlH_(4)`D. All |
|
Answer» Correct Answer - 3 |
|
| 429. |
`NaNO_(3)` is not used as gun powder because it isA. hygroscopicB. very costlyC. amorphousD. suluble in water |
|
Answer» Correct Answer - A |
|
| 430. |
For bleaching powder which is incorrect ?A. It is highly soluble in waterB. It is light yellow powderC. It is an oxidising agentD. It reacts with dilute acids to release chlorine |
| Answer» Correct Answer - A | |
| 431. |
Elektron is an alloy of zine and…….A. BariumB. AluminiumC. MagnesiumD. Copper |
|
Answer» Correct Answer - 3 |
|
| 432. |
What is true about human blood cell ?A. There is high concentration of `K^(+)` ion inside the cellB. There is low concentration of `K^(+)` ion inside the cellC. There is high concentration of `Na^(+)` ion inside the cellD. There is same concentration of `Na^(+) and K^(+)` ion inside the cell |
| Answer» Correct Answer - A | |
| 433. |
Which of the following compound is used in gun powder ?A. `NaNO_(3)`B. `KNO_(3)`C. `LiNO_(3)`D. `Mg(NO)_(2)` |
| Answer» Correct Answer - B | |
| 434. |
Which of the following has the highest first ionisation enthalpy ?A. BaB. BeC. MgD. Ca |
| Answer» Correct Answer - B | |
| 435. |
The most electronegative alkaline earth metal isA. BeB. MgC. RaD. Ca |
| Answer» Correct Answer - A | |
| 436. |
In which compound hydrogen is electronegative-A. `CaH_(2)`B. `CH_(4)`C. `HCI`D. All |
|
Answer» Correct Answer - A `CaH_(2) rarr Ca` is highly electro `+ve, EN`. Of `H gt Ca` |
|
| 437. |
Ionic conductances of hydrated `M^(+)` ions are in the order-A. `Li^(+)(aq) gt Na^(+)(aq) gt K^(+) (aq) gt Rb^(+)(aq) gt Cs^(+)(aq)`B. `Li^(+)(aq) gt Na^(+)(aq) lt K^(+)(aq) lt Rb^(+) (aq) lt Cs^(+)(aq)`C. `Li^(+)(aq) gt Na^(+)(aq) gt K^(+)(aq) gt Rb^(+)(aq) lt Cs^(+)(aq)`D. `Li^(+)(aq) lt Na^(+)(aq) lt K^(+)(aq) lt Rb^(+)(aq) lt Cs^(+)(aq)` |
|
Answer» Correct Answer - D Ionic conductance in aqueous medium conductance `prop (1)/("of hydrated ion radius")` |
|
| 438. |
Alkali metals salts areA. Diamagnetic and colouredB. Diamagnetic and colourlessC. Paramagnetic and colouredD. Paramagnetic and colourless |
|
Answer» Correct Answer - A In alkali metal salts. Alkali metal exist in `M^(+)` ion do not contain unpaired `e^(-)` |
|
| 439. |
Match the compound(s)/metal(s) in X with their uses in Y `{:(X,Y),(A."Liquid sodium metal",I."Breathing apparatus submarine"),(B."Potassium stearate",II."Explosive"),(C."Potassium nitrate",III."Coolant in nuclear reactor"),(D."Potassium superoxide hence correct order is",IV."Soft soap"):}`A. `{:(A,B,C,D),(I,III,II,IV):}`B. `{:(A,B,C,D),(III,IV,II,I):}`C. `{:(A,B,C,D),(II,I,III,IV):}`D. `{:(A,B,C,D),(IV,II,III,I):}` |
| Answer» Correct Answer - B | |
| 440. |
The false statement among the following is:A. `KHCO_(3)` is less soluble in water than `K_(2)CO_(3).`B. `NaHCO_(3) is less soluble n water then `KHCO_(3).`C. `Na_(2)CO_(3)` is less soluble in water than `NaHCO_(3).`D. `Na_(2)CO_(3)` is less soluble in water than `NaHCO_(3).` |
|
Answer» Correct Answer - D |
|
| 441. |
Potassium is --------, ----------- and --------- than sodium.A. Lighter, sofer and more reactiveB. heacier, softer and less reactiveC. lighter, harder and more reactiveD. none of the above |
|
Answer» Correct Answer - A |
|
| 442. |
Which decomposes on heating-A. `NaOH`B. `KOH`C. `LiOH`D. `RbOH` |
| Answer» Correct Answer - C | |
| 443. |
Sodium and potassium occur-A. In native stateB. In combined stateC. In gaseous stateD. All |
| Answer» Correct Answer - B | |
| 444. |
Flame test is not given byA. BeB. KC. SrD. Mg |
| Answer» Correct Answer - A::D | |
| 445. |
Flame test is not given byA. BeB. MgC. `KO_(2)`D. `Sr` |
|
Answer» Correct Answer - A::B both Be and Mg donot give flame test. |
|
| 446. |
Which substance gives a different flame coloration from the other?A. NitrileB. Caustic potashC. Potassium chlorideD. Table salt |
|
Answer» Correct Answer - D |
|
| 447. |
NaOH isA. HygroscopicB. EfflorescentC. DeliquescentD. Photosensitive |
|
Answer» Correct Answer - C NaOH is deliquescent. It absorbs moisture from the atmosphere to such an extent that it itself becomes liquid. |
|
| 448. |
The first three elements of Group 1 have the following atomic structures (a) Lithium : `3p, 4n, 2, 1` electrons (b) Sodium: `11p, 12n, 2, 8, 1` electrons (c) Potassium: `19p, 20n, 2, 8, 8, 1` electrons which of the following features causes them to have similar properties?A. the same number of protonsB. more protons than electronsC. two electrons in the first shellD. one electron in the outermost shell |
|
Answer» Correct Answer - D One electron in the outermost shell. |
|
| 449. |
On Flame test K give_____colourA. Golden yellowB. Crimson redC. lilac(pink)D. Apple green |
| Answer» Correct Answer - C | |
| 450. |
Sodium has______as compared to potassium-A. Less electronegativityB. More ionizaton potentialC. Large atomic radiusD. Lower melting point |
| Answer» Correct Answer - B | |