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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.
| 851. |
The radius of which of the following hydrate ion is smallest?A. `[Li(H_(2)O)_(n)]^(+)`B. `[Na(H_(2)O)_(n)]^(+)`C. `[K(H_(2)O)_(n)]^(+)`D. `[Cs(H_(2)O)_(n)]^(+)` |
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Answer» Correct Answer - D |
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| 852. |
A solution of `MgCl_(2)` in water has pHA. 7B. `gt7`C. `lt7`D. 14.2 |
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Answer» Correct Answer - 3 |
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| 853. |
A chemistry student trying to detect the metallic ion in a salt, makes a paste on a clean platinum wire loop of the salt with concentrated HCl. When he takes a small amount of this paste and keeps it in a non-luminous Bunsen flame, the colour of the flame changes to grassy green.He should, therefore, conclude that the metal isA. BaB. CaC. KD. Sr |
| Answer» Correct Answer - A | |
| 854. |
Which of the following is not hygroscopic-A. `NaCI`B. `MgCI_(2)`C. `CaCI_(2)`D. `LiCI` |
| Answer» Correct Answer - A | |
| 855. |
Which of the following is not correct about the solution when moderate amount of sodium metal is dissolved in liquid ammonia at low temperature ?A. `Na^(+)` ions are produced in solutionB. We get a blue coloured solutionC. the solution acts as a good conductor of electricityD. Liquid ammonia remains diamagnetic |
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Answer» Correct Answer - D All other statement are correct. |
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| 856. |
Assertion : `Na_(2)SO_(4)` can be used as the starting material for the preparation of sodium carbonate and sodium hydroxide. Reason : Sodium hydroxide is prepared by the treatment of milk of lime with sodium carbonate.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 - b Assertion : `ubrace(Na_(2)SO_(4)+4C+CaCO_(3))_("Liblanc process")overset(Delta)rarrubrace(Na_(2)CO_(3)+CaS)_("black ash")+4CO` `Na_(2)CO_(3)+Ca(OH)_(2)("milk of lime") rarr 2NaOH+CaCO_(3)` Reason : True statement. |
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| 857. |
Hardest s-block metal is-A. `Li`B. `Na`C. `Mg`D. `Be` |
| Answer» Correct Answer - D | |
| 858. |
Sodium carbonate is manufactured by Solvay process, the products that are recycled areA. `CO_(2)` and `NH_(3)`B. `CO_(2)` and `NH_(4)CI`C. `NaCI` and `CaO`D. `CaCI_(2)` and `CaO` |
| Answer» Correct Answer - A | |
| 859. |
In the preparation of sodium carbonate which of the following is used-A. Slaked limeB. Lime stoneC. LimeD. quick lime |
| Answer» Correct Answer - B | |
| 860. |
Sodium carbonate on hydrolysis givesA. weak acid and weak baseB. weak acid and strong baseC. weak base and strong baseD. string acid and strong base |
| Answer» Correct Answer - B | |
| 861. |
Fill in the following blanks: (a) Common salt is obtained from sea-water by the process of_____ (b) Rock salt is mined just like_____ (c) Chemical formula of washing soda is_____ (d) Sodium hydrogencarbonate is_____ soda whereas sodium carbonate is ______soda. (e). The chemical formula of plaster of Paris is______A. NaOHB. `NaHCO_(3)`C. `Na_(2)CO_(3)`D. `Na_(2) CO_(3), 10H_(2)O` |
| Answer» Correct Answer - D | |
| 862. |
In `[Mg(H_(2)O)_(6)]^(2+)` Mg hybridiasation isA. `d^(2)sp^(3)`B. `sp^(3)d^(2)`C. `dsp^(2)`D. `Sp^(3)` |
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Answer» Correct Answer - 1 |
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| 863. |
The hottest region of Bunsen flame shown in the figure given below is A. region 2B. region 3C. region 4D. region 1 |
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Answer» Correct Answer - A |
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| 864. |
The hottest region of Bunsen flame shown in the figure given below is A. region 2B. region 3C. region 4D. region 1 |
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Answer» Correct Answer - A |
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| 865. |
The compound which is coloured and paramagnetic due to the presence of unpaired electron is?A. `K_(2)O`B. `K_(2)O_(2)`C. `KO_(2)`D. `Na_(2)O_(2)` |
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Answer» Correct Answer - C |
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| 866. |
Radioactive elements in the s-block areA. Li, BeB. Cs, BaC. Fr, RaD. Li, Mg |
| Answer» Correct Answer - C | |
| 867. |
Which of the following is Radioactive elementA. RaB. BaC. CaD. Sr |
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Answer» Correct Answer - 1 |
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| 868. |
The compound with the lowest melting point of the chlorides isA. NaClB. `CaCl_(2)`C. `BeCl_(2)`D. `KCl` |
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Answer» Correct Answer - C |
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| 869. |
The alkaline earth meta that forms mainly colalent compunds isA. MgB. BeC. CaD. Ba |
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Answer» Correct Answer - 2 |
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| 870. |
Which of the following ionic compunds is paramagnetic and coloured?A. `KO_(3)`B. `KO_(2)`C. `NO_(2)`D. `KNO_(2)` |
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Answer» Correct Answer - A::B::C |
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| 871. |
Which is the correct order of increasing basic strength?A. `MgO lt BeO lt CaO lt BaO`B. `Ca lt Sr lt Ba lt Mg`C. `Be lt CaO lt MgO lt BeO`D. `CaO lt BaO lt BeO lt MgO` |
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Answer» Correct Answer - B Basic character of oxides decreases down the group. |
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| 872. |
Consider the following order : (a) `CH_(4)lt"C"Cl_(4)ltCF_(4):E.N.` of central atom C (b) `Mg^(2+)ltK^(+)ltS^(-2)ltSe^(-2)`: Ionic radius (c) `Be_((aq))^(+2)gtMg_((aq.))^(+2)gtCa_((aq))^(+2)`: Ionic mobility (d) `Be^(+2)gtLi^(+)gtAl^(3+)`: Hydrated size `BegtLigtCs`: Reducing power `Fe_((aq))^(Θ)gtCl_((aq))^(Θ)gtBr_((aq))^(Θ)`: Electrical conductance at infinite dilute solution Then calculate value of `|x-y|^(2)`, where x and y are correct and incorrect orders respectively. |
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Answer» Correct Answer - 4 Correct`rArr(a),(b)rArrx=2` Incorrect`rArr(c), (d),(e),(f)rArry=4 |x-y|^(2)=4` |
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| 873. |
Li does not resemble with other alkali metals in following properties?A. `Li_(2)CO_(3)` decompsses nto oxides while other alkali carbonates are thrermally styble.B. LiCl is predominantly covalent.C. `Li_(3)N` is stable.D. LiCl is non-conducting in molten state. |
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Answer» Correct Answer - A::B::C |
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| 874. |
Select correct statement(s):A. `Li_(2)CO_(3)` is only sparingly soluble in water and no `LiHCO_(3)`has been isolated.B. `K_(2)CO_(3)`cannot be made by a method similar to the ammonis-soda (Solvay) process.C. `Li_(2)CO_(3)` and `MgCO_(3)` both are thermally stable.D. `KCl.MgCl_(2^.)6H_(2)O`is a mineral called camallite. |
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Answer» Correct Answer - A::B::C |
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| 875. |
Both alkali metals and alkaline earth metals are `s-`block elements. They resemble each other in many respects but still there are certain dissimilarities in their properties due to different number of electrons in the valence shell, different atomic radii, ionisation enthalpy, electronegativity, etc. Like lithium, Be also differs from rest of the alkaline earth metals on account of its small atomic size and high electronetativity. `Be^(2+)`ion is very small and exerts a high polarising effect on any anion associated with it. The alkaline earth metal which does no directly combine with hydrogen isA. BeB. CaC. SrD. Ba |
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Answer» Correct Answer - 1 |
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| 876. |
Assertion : Ionization energy of `Be` is almost the same as that of `Al`. Reason : Best diagonal relation ship is shown between `Be` and `Al`.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. |
| Answer» Correct Answer - A | |
| 877. |
Be and Al exhibit diagonal relationship which of the following statements about them is /are not true ? (i) Both react with HCl to liberate `H_(2)`. (ii) They are made passive by `HNO_(3)`. (iii) Their carbides give acetylene on treatment with water . (iv) Their oxides are amphoteric .A. (iii) and (iv)B. (i) and (iii)C. (i) onlyD. (ii) and (iii) |
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Answer» Correct Answer - D Their carbides on treatment with `H_(2)O` gives methane . Aluminium carbide also reacts with `H_(2)` to give methane . `Al_(4) C_(3) + 12 H_(2)O to 4 Al(OH)_(3) + 3 CH_(4)` |
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| 878. |
Which of the following statements (s) is/are not true about the diagonal relationship of `Be` and `Al`?A. Their cholrides are insoluble in organic solventsB. They becames passive by conc `HNO_(3)`C. Both react with NaOH to liberate `H_(2)`.D. Their oxides are amphoteric |
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Answer» Correct Answer - A |
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| 879. |
Which of the following order is incorrect w.r.t. the property indicated ?A. `BeOltMgO ("Basic strength")`B. `BeF_(2)ltMgF_(2)ltCaF_(2)ltSrF_(2)ltBaF_(2)("solubilty")`C. `BeSO_(4)gtMgSO_(4)gtCaSO_(4)gtBaSO_(4)("solubility")`D. `NaCgtKClgtRbClgtCsCl("Melting point")` |
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Answer» Correct Answer - B |
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| 880. |
Which statements are false?A. Manufacture of NaOH is done by Solvay process .B. Manufacture of `K_(2)CO_(3)` is done by Solvay process by replacing NaCl by KCl.C. Manufacture of NaOH is done by Castner Kellner process .D. Manufacture of `NaHCO_(3)` is done by Solvay process . |
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Answer» Correct Answer - A::B |
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| 881. |
Which of the following statements are true?A. `NaHCO_(3)` and `KHCO_(3)` have same crystal structure .B. On heating , `Li_(2)CO_(3)` gives `Li_(2)O` and `CO_(2)` .C. Among alkali metals , Li metal has high ionisation energy and impart no colour to flame .D. `Li_(2)SO_(4)`does not form alum . |
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Answer» Correct Answer - B::D |
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| 882. |
Compare the solubility and thermal stability of the following compounds of the alkali metals with those of the alkaline earth metals. (a) Nitrates (b) Carbonates (c) Sulphates.A. Hydrooxide of A.EM `[M(OH)_(2)]`B. Fluorius os A.M (MF)C. Perchorrates of A.M `(MClO_(4))`D. Sulphates of Aem `(MSO_(4))` |
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Answer» Correct Answer - A |
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| 883. |
Which of the following is water soluble compound of calcium ?A. `Ca(HCO_(3))_(2)`B. `CaSiO_(3)`C. `CaCO_(3)`D. `Ca(OH)_(2)` |
| Answer» Correct Answer - A | |
| 884. |
`MgBr_(2)` and `MgI_(2)` are soluble in acetone because ofA. Their ionic natureB. Their covalent natureC. Their co-ordinate natureD. None is correct |
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Answer» Correct Answer - B Covalent character |
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| 885. |
Which one of the following is most soluble in eitherA. `BeCI_(2)`B. `CaCI_(2)`C. `SrCI_(2)`D. None of these |
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Answer» Correct Answer - A Ether- organic solvent (non polar) covalent substance dissolve in covalent solvent `BeCI_(2)` |
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| 886. |
Statement-1: Magnesium is more malleable and ductile than sodium, because Statement-2: First ionization energy of sodium is higher than that of MgA. Both Statement -1 and Statement-2 are true and Statement-2 is the correct explanation of Statement -1B. Both Statement -1 and Statement-2 are true and Statement-2 is the not correct explanation of Statement -1C. Statement-1 is true but Statement -2 is falseD. Statement-1 is false but Statement -2 is true |
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Answer» Correct Answer - C |
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| 887. |
`Mg^(+2)` does not form either preoxide or superoxidem becauseA. `Mg^(+2)` ion is relatively biggerB. `Mg^(+2)` ion is relatively smallerC. `Mg^(+2)` ion is stableD. `Mg^(+2)` ion is unstable |
| Answer» Correct Answer - B | |
| 888. |
Among `CaH_(2) , BeH_(2) , BaH_(2)` , the order of ionic character isA. `BeH_(2) lt CaH_(2) lt BaH_(2)`B. `CaH_(2) lt BaH_(2) lt CaH_(2)`C. `BeH_(2) lt BaH_(2) lt CaH_(2)`D. `BaH_(2) lt BeH_(2) lt CaH_(2)` |
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Answer» Correct Answer - A As the electronegativity of the element decreases down the group , the ionic character increases , i.e., option (a) is correct . |
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| 889. |
Find the number of compounds from the following in which the element in the anionic part is in the minimum oxiadation state of it : `LiH, Mg_(3)Bi_(2),Al_(4)C_(3), Ca_(3)P_(2), BaO_(2)` |
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Answer» Correct Answer - 4 `LiH,Mg_(3)Bi_(2),Al_(4)C_(3),Ca_(3)P_(2)` |
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| 890. |
Pick out the statement(s) which is ( are ) not true about the diagonal relationship of Li and Mg. (i)Polarising powers of `Li^(+)` and `Mg^(2+)` are almost same. (ii) Like Li, Mg decoposes water very fast (iii) LiCl and `MgCl_(2)` are deliquescent. (iv) Like Li,Mg does not form solid bicarbonates.A. (i) and (ii)B. (ii) and (iii_C. only (ii)D. only (i) |
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Answer» Correct Answer - C |
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| 891. |
The plaster of paris is hardened byA. Liberating `CO_(2)`B. Giving out waterC. Combining with waterD. Changing into `CaCO_(3)` |
| Answer» Correct Answer - C | |
| 892. |
Formula of plaster of Paris isA. `CaSO_(2).2H_(2)O`B. `2(CaSO_(4).1//2H_(2)O)`C. `2CaO. H_(2)O`D. `CaCO_(3)` |
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Answer» Correct Answer - b The formula for plaster of paris is `CaSO_(4).(1)/(2)H_(2)O`. |
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| 893. |
The mixture of `MgCl_(2)` and `MgO` is called _______.A. Double saltB. Sorrel cementC. Portland cementD. None of these |
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Answer» Correct Answer - B `MgCl_(2).6H_(2)O +5MgO+xH_(2)Orarrunderset("Magnesia cement or Sorrel cement")(MgCl_(2).5MgO.xH_(2)O)` |
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| 894. |
The mixture of `MgCl_(2)` and `MgO` is called _______.A. double saltB. Portland cementC. Sorel cementD. None of these |
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Answer» Correct Answer - c When a saturated solution of `MgCl_(2)` is mixed with MgO, the resulting paste sets to a hard marble like mass which consists of oxychloride `(MgO.MgCl_(2).6H_(2)O)`. The paste is known as Sorel cement. |
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| 895. |
Which of the following statements is correct?A. Plaster of Paris can be obtained by hydration of gypsumB. Gypsum is obtained by heating plaster of ParisC. Plaster of Paris is obtianed from gypsum by oxidationD. Plaster of Paris contains higher percentage of calcium than gypsum. |
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Answer» Correct Answer - d Plaster of Paris is obtained when gypsum is heated to `120^(@)C`. |
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| 896. |
Select correct statement(s)A. Oxides and peroxides of alkali metal are diamagentic and colourless.B. Superoxides of alkali metals are paramagneticC. Lithium do not form superoxides.D. Superoxides of alkali metals are colourless. |
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Answer» Correct Answer - A::B::C |
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| 897. |
Concrete is a mixture ofA. Cement ,sand , gravel and waterB. Cemnet , slked lime and waterC. Cement ,sand and waterD. |
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Answer» Correct Answer - 1 |
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| 898. |
Select correct statement(s)?A. All alkali metals from solid bicarbonates.B. Except `LiHCO_(3),` all alkali metal bicarbonated are solid.C. `Li_(2)CO_(3)` decomposes in to `CO_(2)` and `Li_(2)O.`D. `Na_(2)CO_(3)`decomposes into `CO_(2)` and `Na_(2)O.` |
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Answer» Correct Answer - B::C |
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| 899. |
Select correcrt statement (s)?A. Radius of hydrated `Li^(+)` ion is smaller than that of hydrated `Cs^(+)` ion.B. Ionic mobility of hydrated `Li^(+)` ion is lesser than that of hydrated `Cs^(+)` ion.C. Hydrated `Cs^(+)` is more conducting than hydratd `Na^(+)` ion.D. Ionic mobility of hydrated ions follows |
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Answer» Correct Answer - B::C::D |
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| 900. |
The use of `BaSO_4` in taking X-ray pictures of digestive tract is based onA. It is insoluoilityin waterB. Great scttering of X-rays of `B^(2+)` ionsC. Both of theseD. Its non - poisonous character |
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Answer» Correct Answer - 3 |
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