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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.
| 501. |
The properties of lithium and berlium and their compounds differ far more fore those of the other group-1 and group-2 elements and compounsds. Lithium compounds may show closer similarities woth group-2 elements (particularly Mg) than they show toward their own group. Similarly Be resemble Al. which of the following property of Li and Be is differernt from the rest of teh elements of their group?A. Smaller size.B. Outer shell contains only one s and three p-orbitals.C. Higher covalent character in their compounds.D. All of the above |
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Answer» Correct Answer - D |
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| 502. |
The properties of lithium and berlium and their compounds differ far more for those of the other group-1 and group-2 elements and compounds. Lithium compounds may show closer similarities with group-2 elements (particularly Mg) than they show toward their own group. Similarly Be resemble Al. Which type of salt is formed by only Li in group-1A. Nitrate saltB. Nitride saltC. Nitrite saltD. Carbonate salt |
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Answer» Correct Answer - B |
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| 503. |
Certain characteristics lithium differ from those of other alkali metals, the main reason for this isA. small size of lithium atom and `Li^(+)` ionB. extremely high electropositivity of `Li`C. greater hardness of LiD. hydration of `Li^(+)` ion |
| Answer» Correct Answer - A | |
| 504. |
Bleaching powder loses its power on keeping for a long time becauseA. it changes into calcium hypochlorateB. it changes into calcium chloride and calcium hydroxideC. it absorbs moistureD. it changes into calcium chloride and calcium chlorate |
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Answer» Correct Answer - D `3 Ca(O Cl)_(2) to 2 CaCl_(2) + Ca(ClO_(3))_(2)` |
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| 505. |
The properties of lithium and berlium and their compounds differ far more fore those of the other group-1 and group-2 elements and compounsds. Lithium compounds may show closer similarities woth group-2 elements (particularly Mg) than they show toward their own group. Similarly Be resemble Al. Diagonal relationships does not exidt between the pait ofA. Li,BeB. Li,MgC. Be,AlD. B,Si |
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Answer» Correct Answer - A |
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| 506. |
Which one of the following is present as an active ingredient in bleaching powder for bleaching action ?A. `CaOCl_(2)`B. `Ca(O Cl)_(2)`C. `CaO_(2)Cl`D. `CaCl_(2)` |
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Answer» Correct Answer - B Bleaching powder is a mixture of calcium hypochlorite , `Ca(O Cl)_(2)` and basic calcium chloride , `CaCl_(2) ,Ca(OH)_(2) . H_(2)O` . So active ingredient in bleaching powder for bleaching action is `Ca(O Cl)_(2)`. |
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| 507. |
Which one is the active constituent of bleaching powder?A. `Ca(Ocl)Cl`B. `Ca(Ocl)_(2)`C. `Ca(ClO_(2))_(2)`D. `Ca(ClO_(2))Cl` |
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Answer» Correct Answer - 2 |
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| 508. |
Solubility of an ionic compound in water is mainly dependent on: a.Lattice enthalpy , b. Hydration enthalphy Both these factors oppose each other and the resultant of these determines the solubility of an ionic compound in water. If lattce enthalpy has greater value, the compound is less soluble. In case hydration enthalpy has greater value, the compound is highly soluble in water. `BeF_(2)` is soluble in water while fluorides of other alkaline earth metals are insoluble because of:A. ionic nature of `BeF_(2)`B. greater hydration energy of `Be^(2+)` ion as compared to lattice energyC. covalent nature of `BeF_(2)`D. none of these |
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Answer» Correct Answer - B Fluorides of alkaline earth metals except `BeF_(2)` are insoluble in water. The solubility of `BeF_(2)` in water is due to higher hydration energy on accound of small size of `Be^(2+)` ion and `F^(-)` ion and high charge density of `Be^(2+)` ion. |
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| 509. |
The organe coloured substance among the following isA. `BaO_(2)`B. `PbO_(2)`C. `KO_(2)`D. `SnO_(2)` |
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Answer» Correct Answer - C |
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| 510. |
.Which of the alkali metal is having least melting point?A. NaB. KC. RbD. Cs |
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Answer» Correct Answer - D |
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| 511. |
The water of crystallization in 1 mole of washing soda crystal isA. 5B. 7C. 10D. 2 |
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Answer» Correct Answer - C |
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| 512. |
Caustic soda isA. EfflourescentB. DeliquescentC. HygroscopicD. Oxidant |
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Answer» Correct Answer - B |
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| 513. |
A(metal)+`X_(2) overset (Delta) rarr B overset (H_(2)O) rarr Z+D` (A gives Brick red to flame) (`X_(2)` is relatively inert in VA group) `Z overset(Delta)rarrE+H_(2)O,E overset("coke") underset(Delta) rarr {:(F,+,G),(x_(2)darr,Delta,darrNaOH),(I,,Y):}` Compound F on hydrolysis givesA. HCOOHB. `C_(2)H_(2)`C. `NH_(3)`D. `CH_(4)` |
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Answer» Correct Answer - B |
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| 514. |
Assertion : White precipitate of `BaSO_(4)` is insoluble in water but readily dissolves in the solution of sodium salt of ethylenediaminetertraacetic acid (EDTA). Reason : `Ba^(2+)` forms a stable water soluble complex with the anion of the sodium salt of EDTA.A. If both assertion and reason are true and the reason is the correct explanation of the assertion.B. If both assertion and reason are true but reason is not the correct explanation of the assertionC. If assertion is true but reason is false.D. If assertion is false but reason is true. |
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Answer» Correct Answer - a `Ba^(+)` forms a stable water soluble complex with the anion of the sodim salt of EDTA. |
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| 515. |
Assertion : Solution of sodium hydroxide can be stored in a vessel made of `Zn` or `Al`. Reason : Sodium ferrite on treatment with hot water produces sodium hydroxide.A. If both assertion and reason are true and the reason is the correct explanation of the assertion.B. If both assertion and reason are true but reason is not the correct explanation of the assertionC. If assertion is true but reason is false.D. If assertion is false but reason is true. |
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Answer» Correct Answer - d Assertion `: 2Al+6NaOH rarr 2 Na_(3)AlO_(3)+3H_(2)` `Zn+2NaOH rarr Na_(2)ZnO_(2)+H_(2)` So sodium hydroxide solution cannot be stored. Reasion `: 2NaFeO_(2)+H_(2)O("Hot") rarr 2NaOH+Fe_(2)O_(3)` |
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| 516. |
Select the correct statement:A. `(M_(2)O)`and peroxide `(M_(2)O_(2))` of alkali metals are diamagnetic and colourlessB. Superoxides `(MO_(2))` of alkali metals are parmagnetic `(MO_(2))` of alkali metals are paramagneticC. Li and Na do not from stable superoxidesD. all are correct. |
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Answer» Correct Answer - D |
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| 517. |
The least stable ion among the following isA. `Li^(-)`B. `B^(-)`C. `C^(-)`D. `Be^(-)` |
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Answer» Correct Answer - D Configuration of `Be^(-)` ion because unsymmetrical when Be atom takes up an electron : `1s^(2) 2s^(2) 2Px^(1)` |
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| 518. |
Which of the following is not known ?A. `KO_(3)`B. `KO_(4)`C. `KO_(2)`D. `K_(2)O_(2)` |
| Answer» Correct Answer - b | |
| 519. |
Hypo is another name forA. Sodium sulphiteB. Sodium sulphateC. Sodium thiosulphateD. None of the above |
| Answer» Correct Answer - C | |
| 520. |
A solution of `I_(2)` in aqueous Kl on reaction with an aqueous solutionof `Na_(2)S_(2)O_(3)` gets decolourised. The reaction taking place here isA. `Na_(2) S_(2) O_(3)+ H_(2)O+I_(2) to Na_(2) S_(2) O_(4)+2HI`B. `2Na_(2)S_(2)O_(3)+ I_(2) to Na_(2) S_(4) O_(6)+ 2NaI`C. `Na_(2) S_(2)O_(2) +2H_(2) O+2I_(2) to Na_(2)S_(2)O_(5) +4HI`D. `2Na_(2) S_(2)O_(3)+ 2H_(2)O +2I_(2) to Na_(4) S_(4) O_(8)+ 4HI` |
| Answer» Correct Answer - B | |
| 521. |
The following are some of the methods commonly employed for the extraction of metals from their ores. Which of the following methods is generally employed for the extraction of sodium ?A. Reduction of an oxide with cokeB. Electrolysis of an aqueous solution of a chlorideC. Electrolysis of a melten chloride containing `CaCl_(2)`D. Reduction of a chloride with more reactive metal |
| Answer» Correct Answer - C | |
| 522. |
A solution of sodium metal in liquid ammonia is strongly reducing due to the presence ofA. ammoniated `Na^(+)` ionsB. sodium hydrideC. sodium amideD. ammoniated electrons |
| Answer» Correct Answer - d | |
| 523. |
A solution of sodium metal in liquid ammonia is strongly reducing due to the presence ofA. Sodium hydrideB. Sodium amideC. Sodium atomsD. Solvated electrons |
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Answer» Correct Answer - D `Na+ (x +y) NH_(3) to Na(NH_(3))_(x)^(+) +e(NH_(3))_(y)^(-)` |
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| 524. |
Hardening of plaster of paris is because of paris is because ofA. The formation of `CaCO_(3)`B. The formation of `CaSiO_(3)`C. The transition of orhtorhomic gypusum to monoclinic gypsum.D. Dehydration . |
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Answer» Correct Answer - 3 |
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| 525. |
Solution of sodium in liquid `NH_(3)` is a powerful reducing agent. The solution is unstable due to formation ofA. NitrideB. ImideC. AmideD. Nitrogen |
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Answer» Correct Answer - C |
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| 526. |
The most powerful reducing agent among the following is:A. LiB. NaC. RbD. Cs |
| Answer» Correct Answer - A | |
| 527. |
Which of the following is not present in cement ?A. GypsomB. ClayC. AluminaD. Alum |
| Answer» Correct Answer - D | |
| 528. |
Which of the following is incorrect ?A. Mg burns in air releasing dazzling light rich in UV raysB. `CaCl_(2^.)6H_(2)O` when mixed with ice gives freezing mixtureC. `Mg` cannot form complexesD. `Be` can form complexes due to its very small size |
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Answer» Correct Answer - C |
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| 529. |
Cement is aA. Magnesium Aluminium silicateB. Beryllium SilicateC. Barrium sillcateD. Calcium Aluminium silicate |
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Answer» Correct Answer - 4 |
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| 530. |
When zeolite which is hydrated sodium aluminium silicate is treated with hard water, the sodium ions are exchanged with which of the following ion (S)?A. `H^(+)` ionsB. `Mg^(2+)` ionsC. `Ca^(2+)` ionsD. `SO_(4)^(2-)` ions |
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Answer» Correct Answer - B::C (b) and (c ) are both correct |
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| 531. |
Alkaline earth metals are denser than alkali metals, because metallic bonding in alkaline earth metals isA. Stronger B. WeakerC. VolatileD. Not present. |
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Answer» Correct Answer - A Alkaline earth metals `(ns^(2))` are denser than alkali metals `(ns^(-1))` because metallic bonding in alkakline earth metal is stronger. |
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| 532. |
One of the following statements is incorrectA. Elements of group 2 are good conductors of electricity and heatB. Compounds of group 2 elements are diamagnetic in natureC. The salts of group 2 elements are more heavily hydrated than those of elements of group 1D. Wlements of group 2 are more electropositive than group 1 elements |
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Answer» Correct Answer - D Elements of group 2 are less electropossitive than group 1 elements. |
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| 533. |
`Mg^(2+)` ion more highly hydrated than `Na^(+)` ion. |
| Answer» The positive charge density around `Mg^(2)` ion is more than around `na^(+)` ion due to its smaller size and more number positive chrges. Therefore,`Mg^(2+)` ion has a greater tendency to attract surrounding `H_(2)O` molecules from water than `Na^(+)` ion. In other words, it is more highly hydrated than `Na^(+)` ion. | |
| 534. |
Alkaline earth metals are denser than alkali metals, because metallic bonding in alkaline earth metals isA. StrongerB. WeakerC. VolatileD. Not present. |
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Answer» Correct Answer - A Alkaline earth metals `(ns^(2))` are denser than alkali metals `(ns^(-1))` because metallic bonding in alkakline earth metal is stronger. |
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| 535. |
If `Na^(+)` ion is larger than `Mg^(2+)` ion and `S^(2-)` ion is larger than `Cl^(-)` ion, which of the following will be least soluble in water?A. Sodium chlorideB. Soldium sulphideC. Magnesium chlorideD. Magnesium sulphide |
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Answer» Correct Answer - D Magnesium sulphide. Higher the lattice energy lower solubility. Out of the four combinations possible, the lattice energy of MgS (bi-bivalent ionic solid) is higher than those of `Na_(2) S, M_(2)Cl_(2)` (unibivalent or biunivalent ionic solids) and `NaCl` (univi-univalent ionic solids) and hence MgS is the least soluble. |
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| 536. |
When oxygen reacts with potassium, which of the following is preerentially formed?A. `K_(2)O_(4)`B. `KO_(2)`C. `K_(2)O_(3)`D. `K_(2)O` |
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Answer» Correct Answer - b `K+O_(2)rarrKO_(2)` (superoxide) |
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| 537. |
The substance not likely to contain `CaCO_(3)` isA. dolomiteB. a marble statueC. calcined gypsumD. sea shells |
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Answer» Correct Answer - C Calcined gypsum is anhydrous `CaSO_(4)`. |
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| 538. |
The hydroxide of which metal ion(s) which is/are soluble in excess of NaOH solutionA. `Fe^(+++)`B. `Ce^(+++)`C. `Al^(+++)`D. `Cu^(+++)` |
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Answer» Correct Answer - C |
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| 539. |
The hydroxide which is max, soluble in water is ?A. `Ba(OH)_(2)`B. `Mg(OH)_(2)`C. `Sr(OH)_(2)`D. `Ca(OH)_(2)` |
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Answer» Correct Answer - A The solubility of hydroxides of alkaline earth metals increases down the group due to decrease in lattice energy. |
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| 540. |
The strongest base in the following is :A. `Al(OH)_(3)`B. `Mg(OH)_(2)`C. `Ca(OH)_(2)`D. `Ba(OH)_(2)` |
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Answer» Correct Answer - D `Ba(OH)_(2)` is the strongest base because of Ba is the most electropositive element. |
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| 541. |
Alkali metals are characterised byA. good conductor of heat and electricityB. high oxidation potentialsC. high metling pointsD. solubility in liwuid ammonia |
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Answer» Correct Answer - C |
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| 542. |
Which of the following is the strongest base ?A. LiOHB. NaOHC. KOHD. CsOH |
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Answer» Correct Answer - D Cs has the least IE and Cs - OH bond can cleave most easily. |
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| 543. |
Which has the maximum ksp value ?A. KOHB. CsOHC. LiOHD. RbOH |
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Answer» Correct Answer - B CsOH has the maximum ksp value as it is maximum soluble in water |
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| 544. |
Choose correct ordect orders:A. `BeSO_(4)ltMgSO_(4)lt CaSO_(4)ltSrSO_(4)ltBaSO_(4)` (enthalpy of solution )B. `Ca(OH)_(2)ltSr(OH)_(2)("solubility") BeCO_(3)gtMg CO_(3)`C. `gtCaCO_(3)("thermal stability ")`D. `NaO_(2)gtKO_(2)("stability")` |
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Answer» Correct Answer - 1 |
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| 545. |
Which of the following gives sodium hydroxide along with hydrogen gas on reaction with waterA. Sodium oxideB. Sodium amalgamC. Sodium peroxideD. Sodium carbonate. |
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Answer» Correct Answer - B |
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| 546. |
Which of the following orders of properties is /are correct?A. `i)"Meltimng point of halides : "MF_(2)gtMCl_(2)gtMBr_(2)gtMI_(2)`B. Basic characherter of oxides : `BeO lt MgO lt CaOgt SrOlt BaO`C. Decreasing polariity :`CsFgt KF gtCaOgt Mgo`D. Increasing ionic character :`BeC_(2)lt Mg Cl_(2)lt CaCl_(2)` |
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Answer» Correct Answer - 2 |
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| 547. |
Which of the following oxides is formed when potassium metal is burnt in excess air ?A. `K_(2)O`B. `KO`C. `KO_(2)`D. `K_(2)O_(2)` |
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Answer» Correct Answer - C `KO_(2)` (super oxide) is formed. |
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| 548. |
Which of the following oxides is formed when potassium metal is burnt in excess air ?A. `KO_(2)`B. `K_(2)O`C. `K_(2)O_(2)`D. `KO_(2)` |
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Answer» Correct Answer - D |
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| 549. |
Sodium when burnt in excess of oxygen gives sodium oxide. |
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Answer» Correct Answer - F |
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| 550. |
Which of the following oxides is formed when potassium metal is burnt in excess air ?A. `KO_(3)`B. `K_(2)O`C. `K_(2)O_(2)`D. `KO_(2)` |
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Answer» Correct Answer - D `K+O_(2) overset("burning")rarr KO_(2)` |
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