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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.
| 1001. |
The nitrate which when heated gives off a gas (or) a mixture of gases which cannot relight a glowing splinter isA. `KClO_(3)`B. `NaNO_(3)`C. `K_(2)SO_(3)`D. `CaCO_(3)` |
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Answer» Correct Answer - A::B |
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| 1002. |
Which one of the following is the weakest base ?A. LiOHB. NaOHC. KOHD. RbOH |
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Answer» Correct Answer - A |
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| 1003. |
Select correct statement (s):A. `CaCO_(3)` is more soluble in a solution of `CO_(2)` than in `H_(2)O`B. `Na_(2)CO_(3)` is converted to `Na_(2)O` and `CO_(2)` on heating.C. `Li_(2) CO_(3)` is thermally unstable.D. Presence of `CaCl_(2) " or " CaSO_(4)` in water causes temporary hardness. |
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Answer» Correct Answer - A::C |
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| 1004. |
Anhydrous mangesium chlroide is prepared byA. dissolving Mg in dil. HClB. dissolving MgO in dil. HClC. Passing `Cl_(2)` over red hot mixture of `MgO+C`D. All of the above |
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Answer» Correct Answer - c Anhydrous `MgCl_(2)` is obtained by passing chlorine gas over red hot mixture of `MgO` and C. `MgO+C+Cl_(2)rarrMgCl_(2)+CO` |
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| 1005. |
A substance which gives brick red flame and breadks down on heating to give oxygen and a brown gas, isA. magnesium nitrateB. calcium nitrateC. barium nitrateD. strontium nitrate |
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Answer» Correct Answer - b Brick red colour is given by Ca which `O_(2)` and brown colour are given by `NO_(2)` group. `2Ca(NO_(3))_(2)overset(Delta)rarr2CaO+O_(2)+4NO_(2)` |
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| 1006. |
In cell fluid , the most abundant cation is :A. `Na^(+)`B. `K^(+)`C. `Mg^(+)`D. `Ca^(+2)` |
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Answer» Correct Answer - A |
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| 1007. |
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 I isA. `Ca_(3)N_(2)`B. `CaCN_(2)`C. `Ca_(3)C_(2)`D. `Ca(CN)_(2)` |
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Answer» Correct Answer - B |
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| 1008. |
Let us consider the following reaction : `KO_(x) + H_(2)O rarr KOH + H_(Y)O_(Z) + O_(2)` (unbalanced equation ) `KO_(x)` is a chrome yellow powder . What is the value of X ? |
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Answer» Correct Answer - 2 |
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| 1009. |
Match the elements given in Column I with the properties mentioned in Column II. `{:(Column I,Column II),(A.Li,1."Insoluble sulphate"),(B.Na,2."Strongest monoacidic base"),(C.Ca,3."Most negative" E^(Theta) "value among alkali metals"),(D.Ba,4."Insoluble oxalate"),(,5.6s^(2)"outer electronic configuration"):}`A. `{:(1,2,3,4),(C,B,D,A):}`B. D,A,B,CC. D,a,c,bD. C,b,a,d |
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Answer» Correct Answer - 1 |
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| 1010. |
On dissolving moderate amount of sodium metal in liquid ammonia at low temperature, which of the following does not occur ?A. Blue coloured solution is obtainedB. `Na^(+)` ions are formed in the solutionC. Liquid `NH_(3)` solution becomes good conductor of electricityD. Liquid `NH_(3)` solution remains diamagnetic |
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Answer» Correct Answer - D The alkali metals dissolve in liquid ammonia giving deep blue solution which are conducting in nature. |
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| 1011. |
In the Solvay process , can we obtain sodium carbonate directly by treating the solution containing `(NH_(4))_(2) CO_(3)` with sodium chloride ? Explain . |
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Answer» In Solvay process , we cannot obtain directly sodium carbonate by treating the solution containing `(NH_(4))_(2)CO_(3)` with sodium chloride because both `Na_(2)CO_(3)` and `NH_(4)Cl` are highly soluble and the equilibrium will not shift in the forward direction `(NH_(4))_(2) CO_(3) + 2 NaCl hArr Na_(2)CO_(3) + 2 NH_(4)Cl` |
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| 1012. |
On dissolving moderate amount of sodium metal in liquid `NH_(3)` at low temperature , which one of the following does not occur ?A. Blue coloured solution is obtainedB. `Na^(+)` ions are formed in the solutionC. Liquid ammonia becomes a good conductor of electricityD. Liquid ammonia remains diamagnetic . |
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Answer» Correct Answer - C It is not liquid ammonia but the solution which becomes good conductor of electricity . |
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| 1013. |
Write Lewis structure of `O_(2)^(-)` ion and find out oxidation state of each oxygen atom ? What is the average oxidation state of oxygen in this ion ? |
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Answer» The Lewis structure of `O_(2)^(-)` is `:overset(.)underset(..)(O)- underset(..)overset(..)(O):-. ` Since O atom carrying no charge has six electrons and hence its O.N. is zero but O atom carrying negative charge has seven electrons and hence its O.N. is `-1` . Therefore , average O.N. of each O = 1/2 (0+1) = 1/2. |
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| 1014. |
Complete the following reactions `" " (i) O_(2)^(2-) + H_(2) O to (ii) O_(2)^(-) + H_(2)O to ` |
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Answer» (i) Peroxide ions react with water evolving `H_(2)O_(2). " " O_(2)^(2-) + 2H_(2)O to 2 OH^(-) + H_(2)O_(2)` (ii) Superoxides react with water evolving `H_(2)O_(2)` and `O_(2) " " 2O_(2)^(-) + 2H_(2)O to 2 OH^(-) + H_(2)O_(2) + O_(2)` |
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| 1015. |
The products obtained on heating iodine with cohncentrated caustic soda solution areA. NaOI+NaIB. `NaIO_(3)+NaI`C. `NaIO+NaIO_(3)+NaI`D. `NalO_(4)+NaI` |
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Answer» Correct Answer - B |
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| 1016. |
Assertion . Li resembles Mg. Reason . `Li^(+)` has approximately the same size as `Mg^(2+)`A. If both assertion and reason are true, and reason is the true explanation of the assertion.B. If both assertion and reason are true, but reason is not the true explanation of the assertion.C. If assertion is true, but reason is falseD. If both assertion and reason are false. |
| Answer» Correct Answer - a | |
| 1017. |
The hydration energy of `Mg^(2+)` is greater than that ofA. `Al^(3+)`B. `Na^(+)`C. `Be^(2+)`D. `Mg^(3+)` |
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Answer» Correct Answer - B `Na^(+)` has +1 unit charge . `Mg^(2+)` and `Be^(2+)` have +2 unit charge while `Mg^(2+)` and `Al^(3+)` have + 3 unit charge , therefore , hydration energy of `Al^(3+)` and `Mg^(3+)` are expected to be higher than those of `Mg^(2+)` and `Be^(2+)` , which in turn , are expected to be higher than that of `Na^(+)` . Further , the hydration energy of `Be^(2+)` is higher than that of `Mg^(2+)` due to its smaller size . In other words , hydration energy of `Mg^(2+)` is expected to be higher than that of `Na^(+)`. |
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| 1018. |
The hydration entahphy of `Mg^(2+)` ion is higer than that ofA. `Al^(3+)`B. `K^((+)`C. `Na^(+)`D. Both 2&3 |
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Answer» Correct Answer - 4 |
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| 1019. |
Solution of `K_(2)O` in water in basic, because it contains a significant concentration ofA. `O_(2)^(2-)`B. `O^(2-)`C. `OH^(-)`D. `K^(+)` |
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Answer» Correct Answer - C `K_(2)O+H_(2)O rarr 2 KOH rarr K^(+) +OH^(-)` |
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| 1020. |
Weakest base among KOH, NaOH, `Ca(OH)_(2)" and "Zn(OH)_(2)` is :A. `Ca(OH)_(2)`B. `KOH`C. `NaOH`D. `Zn(OH)_(2)` |
| Answer» Correct Answer - D | |
| 1021. |
Statement- 1 . Alkali metals dissolved in liquid ammonia to give blue solutions . Statement- 2 . Alkali metals in liquid ammonia give solvated species of the type `[M(NH_(3))_(n)]^(+)` (M = alkali metals)A. Statement-1 is True, Statement-2 is True, Statement-2 is a correct explanation for statement-1.B. Statement-1 is True, Statement-2 is True, Statement-2 is not a correct explanation for statement-1.C. Statement-1 is True, Statement-2 is False.D. Statement-1 is False, Statement-2 is True. |
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Answer» Correct Answer - b Correct explanation . The blue colour of the solution is due to ammoniated electrons , i.e., `e^(-) (NH_(3))_(x)`. |
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| 1022. |
The salt of an alkali metal gives yellow colour in the flame test . Also its aqueous solution gives an insoluble white precipitate with barium chloride in acid medium . The salt isA. NaClB. `K_(2)SO_(4)`C. `Na_(2)SO_(4)`D. `Li_(2)SO_(4)` |
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Answer» Correct Answer - C Since the alkali metal salt gives a yellow colour in the flame , it must be sodium salt . Further , since the salt gives an insoluble white ppt. with `BaCl_(2)` in acidic medium , it must be sodium sulphate , `Na_(2)SO_(4)`. `Na_(2)SO_(4) + BaCl_(2) to underset("White ppt.")(BaSO_(4)) darr + 2 NaCl` |
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| 1023. |
Assertion : Solutions of alkali metals in liquid ammonia are good reducing agents. Reason : They contain free or solvated electrons.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 The reducing character is due to the presence of solvated unpaired electrons , `e.g. O_(2)+2e^(-) rarr O_(2)^(-).` |
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| 1024. |
Statement I: Alkali metals dissolve in liquid ammonia to give blue solutions. Statement II: Alkali metals in liquid ammonia give solvated species of the type `[M(NH_(3))_(n)]^(o+)` (M = alkali metals).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 Alkali metals with ammonia give blue colour due to ammoniated `e^(-).` `Na+(x+y)NH_(3) rarr [Na(NH_(3))_(y)]^(+)+[e(NH_(3))_(x)]^(-)` solvated `(` blue colour `)` electron. |
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| 1025. |
The salt of an alkali metal gives violet colour in the flame test . Its aqueous solution gives a white precipitate with barium chloride in hydrochloric acid medium . The salt isA. `K_(2)SO_(4)`B. `KCl`C. `Na_(2)SO_(4)`D. `K_(2)CO_(3)` |
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Answer» Correct Answer - A K imparts violet colour to the flame and `SO_(4)^(2-)` ions produce white ppt. of `BaSO_(4)` when treated `K_(2)SO_(4) + BaCl_(2) to underset("White ppt.")(BaSO_(4)) darr + 2 KCl` with an aqueous solution of `BaCl_(2)` . Thus , option (a) is correct . |
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| 1026. |
A substance X is a compound of `s-` block element, substance X give a violet color in flame test, X is `:`A. `LiCl`B. `MgCl`C. `BaCl_(2)`D. `KCl` |
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Answer» Correct Answer - 4 In the flame test of KCl gives violet color. |
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| 1027. |
A colourless salt gives violet colour to Bunsen flame and also turns moistured litmus paper blue. It is :A. `Na_(2)CO_(3)`B. `KNO_(3)`C. `K_(2)CO_(3)`D. `Cu(OH)_(2)` |
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Answer» Correct Answer - C Viloet colour to flame is characteristic of potassium. Also aqueous solution of `K_(2)CO_(3)` is alkaline. |
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| 1028. |
In presence of iron, alkali metal react with liquid ammonia and formA. Metal mixture `+H_(2)`B. Iron metal mixture `+H_(2)`C. Metal mixtureD. Metal amide `+H_(2)` |
| Answer» Correct Answer - D | |
| 1029. |
Which alkali metal on flame test given red violet colourA. `Li`B. `Cs`C. `Na`D. `Rb` |
| Answer» Correct Answer - D | |
| 1030. |
A substance `X` is a compound of an element of group `1 A` the substance `X` gives a violet colour in flame test, `X` isA. NaClB. KClC. `MgCl_(2)`D. LiCl |
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Answer» Correct Answer - B |
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| 1031. |
A solid is a compound of group I element and it gives a bright red colour in the flame test. The solid isA. LiBrB. CaClC. KClD. NaCl |
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Answer» Correct Answer - A If the temperature rises to `30^(@)` C, Cs will get melted |
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| 1032. |
Why the lithium show anomalous property ?A. Lithium has the smallest sizeB. Lithium has low polarizing powerC. Lithium has high radius to charge ratioD. Lithium has low charge to radius ratio |
| Answer» Correct Answer - A | |
| 1033. |
A binary compound formed between the elements with atomic numbers 19 and 17 is expected to beA. a water soluble compound forming a conducting solution in waterB. a soft, easily deformed solidC. a solid with a low melting pointD. an electrically non-conducting solid |
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Answer» Correct Answer - A Element with At. No. 19 will lose one electron and element with At.no.17 will gain that electron to form an ionic water soluble compound. |
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| 1034. |
Which of the following oxides is not expected to react with sodium hydroxide ?A. CaOB. `SiO_(2)`C. BeOD. `B_(2)O_(3)` |
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Answer» Correct Answer - A CaO since is a basic oxide |
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| 1035. |
The alkali metals have low melting point. Which of the following alkali metal is expected to melt if the room temperature rises to `30^(@)C` ?A. NaB. KC. RbD. Cs |
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Answer» Correct Answer - D Lithium salts impart bright red colour to the flame . |
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| 1036. |
Which of the following are the uses of lithium?A. Electrochemical cellsB. To make tetra ethyl leadC. Liquid metal is used as a coolant in fast breed nuclear reactionsD. LiOH is used in manufacture of soft soap |
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Answer» Correct Answer - A Na is used to make a Na/Pb alloy needed to make `PbEt_(4)" and "PbMe_(4).` Liquid sodium metal is used as a coolant in fast breed nuclear reactions. KOH is used in the manufacture of soft soap. |
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| 1037. |
Which of the following are expected to be coloured?A. `K_(2)O`B. `K_(2)O_(2)`C. `KO_(2)`D. None of these |
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Answer» Correct Answer - C `KO_(2)` being paramagnetic exhibits orange colour. |
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| 1038. |
Which element will exhibit the photoelectric effect with light of the longest wavelength?A. KB. RbC. MgD. Ca |
| Answer» Correct Answer - B | |
| 1039. |
Most thermally stable peroxide can be generated for which of the following alkali metals?A. LiB. NaC. KD. Cs |
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Answer» Correct Answer - D Large cation stabilises large anion. |
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| 1040. |
Which is the longest lived isotope of Francium?A. `Fr^(223)`B. `Fr^(222)`C. `Fr^(224)`D. `Fr^(225)` |
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Answer» Correct Answer - A `Fr^(223)` has a half-life of only 21 minutes. |
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| 1041. |
Which element does not form hydride upon heating with hydrogen?A. BeB. MgC. SrD. Ba |
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Answer» Correct Answer - A Be does not form hydride `[BeH_(2)]` by directing with hydrogen |
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| 1042. |
Which element does not form hydride upon heating with hydrogen?A. BeB. MgC. CaD. Sr |
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Answer» Correct Answer - A `BeH_(2)` is prepared by : `2BeCl_(2)+LiAlH_(4)rarr2BeH_(2)+LiCl+AlCl_(3)` |
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| 1043. |
Which lithium halide is soluble in ethanol, acetone, ethylacetate as well as pyridine?A. LiFB. LiClC. LiBrD. LiI |
| Answer» Correct Answer - B | |
| 1044. |
Which among the following is thermally least stable?A. `Li_(2)CO_(3)`B. `Na_(2)CO_(3)`C. `K_(2)CO_(3)`D. `Cs_(2)CO_(3)` |
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Answer» Correct Answer - A `Li_(2)CO_(3)overset(Delta)rarrLi_(2)O+CO_(2)` |
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| 1045. |
The valence shell electronic configuration of alkali metals isA. `ns ^(1)`B. `na^(2)`C. `ns^(2)np^(1)`D. `ns^(2)np^(2)` |
| Answer» Correct Answer - A | |
| 1046. |
The hydride ion `H^(-)` is stronger base than its hydroxide ion `OH^(-)`. Which of the following reaction will occut if sodium hydride is dissolved in water:-A. `H_((aq))^(-) + H_(2)O rarr H_(3)O^(+)`B. `H_((aq))^(-)+H_(2)O rarr OH^(-)+H_(2)`C. `H^(-)+H_(2)O rarr H_(2)+O_(2)`D. `H^(-)+H_(2)O rarr` No reaction |
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Answer» Correct Answer - B `H^(+)+ underset(H^(+)OH^(-))(H_(2)O)rarr underset(H_(2))(H^(+)H^(-)) +OH^(-)` |
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| 1047. |
In barium hydride, hydrogen is-A. Electro positiveB. Electro negativeC. NeutralD. None of these |
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Answer» Correct Answer - B `BaH_(2) rarr H` is electro -ve |
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| 1048. |
Which metal does not form ionic hydride-A. `Na`B. `Rb`C. `Ca`D. `Be` |
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Answer» Correct Answer - D Be (higher polarization power) |
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| 1049. |
All alkali metals have one valence electron, `ns^(1)`, outside the noble gas core except :A. NaB. FrC. CsD. None of these |
| Answer» Correct Answer - D | |
| 1050. |
The atomic and ionic radii of alkali metals vary on moving down the group :A. `LigtNagtKgtRbgtCs`B. `LigtNa^(+)gtK^(+)gtRb^(+)gtCs^(+)`C. `LiltNaltKgtRbgtCs`D. `Li^(+)ltNa^(+)ltK^(+)ltRb^(+)ltCs^(+)` |
| Answer» Correct Answer - D | |