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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.
| 951. |
Which of the following is not correct?A. Caustic soda is deliquesent.B. Washing soda is hygroscopicC. Brine is concentrated solution of NaCl.D. Aqueous solution of `Na_(2)CO_(3)` and Na `HCO_(3)` |
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Answer» Correct Answer - B |
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| 952. |
Which of the following forms the most basic hydroxide ?A. `Cu`B. `Al`C. `Na`D. `Zn` |
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Answer» Correct Answer - C Alkali metals form most basic hydroxide. |
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| 953. |
When `CO_(2)` is passed into brine solution saturated with ammonia we getA. `NH_(4)HCO_(3)`B. `(NH_(4))_(2)CO_(3)`C. `NaHCO_(3)`D. `Na_(2)CO_(3)` |
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Answer» Correct Answer - C |
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| 954. |
The order of melting point of chloirdes of alkali metals is :A. `LiCl gt NaCl gt KCl gt CsCl`B. `LiCl gt NaCl gt KCl gt CsCl`C. `NaCl gt KCl gt CsCl gt LiCl`D. `LiCl gt NaCl gt CsCl gt KCl` |
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Answer» Correct Answer - C `LiCl` is covalent |
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| 955. |
Brine is chemicallyA. conc. Solution of `Na_(2)CO_(3)`B. conc. Solution of `Na_(2)SO_(4)`C. conc. Solution of `NaCl`D. cons. Solution of alum |
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Answer» Correct Answer - C It is a fact. |
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| 956. |
The colour of the precipitate produced by adding `NaOH` solution to `HgCl` isA. YellowB. BlackC. BrownD. White |
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Answer» Correct Answer - A `HgCl_(2)+2NaOH rarr HgO+2NaCl+H_(2)O` |
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| 957. |
Which of the following reacts with water with high rate ?A. `Li`B. `K`C. `Na`D. `Rb` |
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Answer» Correct Answer - D `2Rb+2H_(2)O rarr RbOH+H_(2)` `overset(Li lt Na lt K lt Rb lt Cs)(rarr)` As we go down the group reactivity with `H_(2)O` increases. |
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| 958. |
When washing soda is heated.A. `CO` is releasedB. `O+O_(2)` is releasedC. `O_(2)` is releasedD. Water vapour is released |
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Answer» Correct Answer - D `underset("washing poweder") (Na_(2)CO_(3).10H_(2)O) overset(Delta)rarrNa_(2)CO_(3).H_(2)O overset(Delta)rarrNa_(2)Co_(3)+H_(2)Ouarr` |
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| 959. |
When washing soda is heatedA. `CO_(2)` is releasedB. `CO+CO_(2)` is releasedC. CO is releasedD. water vapour is released |
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Answer» Correct Answer - d `Na_(2)CO_(3).10H_(2)Ooverset(Delta)rarrNa_(2)CO_(3).H_(2)Ooverset(Delta)rarrNa_(2)CO_(3)+H_(2)Ouparrow` |
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| 960. |
When washing soda is heated.A. CO is releasedB. `CO + CO_(2)` is releasedC. `CO_(2)` is releasedD. Water vapours are released. |
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Answer» Correct Answer - D Upon heating, washing soda `(Na_(2)CO_(3). 10 H_(2)O)` loses molecules of `H_(2)O` and becomes anydrous. `Na_(2)CO_(3)` does not decompose upon further heating. |
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| 961. |
Find the number of s-block elements which can produce ammoniated cation and ammoniated electron with liquid ammonia. Li, Na, K, Rb, Cs, Ca, Sr, Ba |
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Answer» Correct Answer - 8 All can form. |
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| 962. |
When washing soda is heated.A. `Co` is releasedB. `CO+CO_(2)` is releasedC. `CO_(2)` is releasedD. Water vapour is released |
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Answer» Correct Answer - D `underset("washing powder")(Na_(2)CO_(2).10H_(2)O) overset(Delta)rarrNa_(2)CO_(3).H_(2)O overset(Delta)(rarr)NaCO_(3)+H_(2)O uarr` |
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| 963. |
Assertion : `Be SO_(4)` and `MgSO_(4)` are soluble in water. Reason : `BaSO_(4)` is water insoluble because lattice energy of `BaSO_(4)` is higher than its hydration energy.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 `BeSO_(4)` and `MgSO_(4)` are readily soluble in water, the solubility decreases from `CaSO_(4)` to `BaSO_(4)`. The greater hydration enthalpies of `Be^(2+)` and `Mg^(2+)` ions overcome the lattice enthalpy factor and therefore their sulphates are soluble in water. |
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| 964. |
Which of the following alkaki metals is having the least melting point ? `Na` (b) `K` (c) `Rb` (d) `Cs` |
| Answer» (d) Cesium (Cs) has the least m.p. due to its maximum size the lattice enthalpy. | |
| 965. |
The correct arrangement of increasing order of atomic radius among Na, K, Mg, Rb isA. `Na lt K lt Mg lt Rb`B. `K lt Na lt Mg lt Rb`C. `Na lt Mg lt K lt Rb`D. `Rb lt K lt Mg lt Na` |
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Answer» Correct Answer - A Mg belongs to group 2. Therefore, its size is less than that of Na. |
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| 966. |
Which of the following is not correct ?A. `2Li_(2)O overset("heat")underset(673K) rarr Li_(2)O_(2)+2Li`B. `2K_(2)O overset("heat")underset(673K) rarr K_(2)O_(2)+2K`C. `2Na_(2)O overset("heat")underset(673K)rarr Na_(2)O_(2)+2Na`D. `2Rb_(2)O overset("heat")underset(673K)rarr Rb_(2)O_(2)+2Rb` |
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Answer» Correct Answer - A Lithium does not form peroxide. |
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| 967. |
Which of the following statements is false ?A. `Mg^(2+)` ions are important in the green parts of plants.B. `Mg^(2+)` ions form a complex with `ATP.`C. `Ca^(2+)` ions are important in blood clotting.D. `Ca^(2+)` ions are not important in maintaining the regular beating of the heart . |
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Answer» Correct Answer - D `Ca^(+2)` ions are important in blood clotting and are also important in mainting the regular beating of the heart. |
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| 968. |
The correct sequence of increasing covalent character is represented byA. `NaCl lt LiCl lt BeCl_(2)`B. `BeCl_(2) lt NaCl lt LiCl`C. `BeCl_(2) lt LiCl lt NaCl`D. `LiCl lt NaCl lt BeCl_(2)` |
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Answer» Correct Answer - A Covalent character in a compound is found by Fajans Rule. `(i)` Greater the size of the cation, more will be the ionic character and `(ii)` Greater the size of the anion, more will be its covalent character and charge on the cation is dominant over the size of the cation. `(iii)` Greater the cahrge on the cation, more will be its covalent character Hence `BeCl_(2)gtLiClgtNaCl(` in covalent character `)` |
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| 969. |
The minimum equivalent conductance in fused state is shown by-A. `MgCI_(2)`B. `BeCI_(2)`C. `CaCI_(2)`D. `SrCI_(2)` |
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Answer» Correct Answer - B Equivalent conductance `prop` number of ions since `BeCI_(2)` is most covalent comp. therefore it does not ionise |
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| 970. |
Which of the following has lowest melting point ?A. LiB. NaC. KD. Cs |
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Answer» Correct Answer - D Melting point decreases from top to bottom in a group. |
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| 971. |
Which of the following compounds has the lowest melting point ?A. `CaF_(2)`B. `CaCl_(2)`C. `CaBr_(2)`D. `CaI_(2)` |
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Answer» Correct Answer - D `CaI_(2)` has maximum covalent character due to large size of anion and possesses lowest energy. Thus, melting point is lowest. |
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| 972. |
Which of the following compounds has the lowest melting point ?A. `CaCI_(2)`B. `CaBr_(2)`C. `CaI_(2)`D. `CaF_(2)` |
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Answer» Correct Answer - C `CaI_(2)` |
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| 973. |
Property of the alkaline earth metals that increases with their atomic number isA. solubility of their hydroxide in waterB. solubility of their sulphates in waterC. ionization energyD. electronegativity |
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Answer» Correct Answer - B Solubility of hydroxides of alkaline earth metals increases because both the lattice enthalpy and hydration enthalpy decrease down the group as the size of the cation increases but lattice enthalpy decreases more rapidly than the hydration enthalpy and hence the solubility increases down the group . Among sulphates , since the size of `SO_(4)^(2-)` ion is very big as compared to the metal cation , therefore , lattice enthalpy remains almost constant but their hydration enthalpy decreases down the group . Thus , the solubility of sulphates decreases down the group . Of course , electronegativity and ionization enthalpy both decrease down the group as the atomic size increases . |
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| 974. |
Property of the alkaline earth metals that increases with their atomic number isA. ElectrongetivityB. Solubility of their hydroxides in waterC. Solubility of their sulphates in waterD. Ionization energy |
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Answer» Correct Answer - B Solubility of hydroxide `prop (1)/(L.E)` Moving top to bottom `L.E. darr` solubility `uarr` |
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| 975. |
Property of the alkaline earth metals that increases with their atomic number isA. solubility of their hydroxide in waterB. solubility of their sulphates in waterC. ionisation energyD. electronegativity |
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Answer» Correct Answer - A Lattice energy decreases more rapidly than hydration energy for alkaline earth metal hydroxides |
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| 976. |
Property of the alkaline earth metals that increases with their atomic number isA. ionisation energyB. solubility of their hydroxidesC. solubility of their sulphatesD. eletronegativity |
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Answer» Correct Answer - B Solubility order for hydroxides of alkaline earth metals is `Be lt (OH)_(2) lt Mg(OH)_(2) lt Ca(OH)_(2) lt Sr(OH)_(2) lt Ba(OH)_(2)` |
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| 977. |
Which property increase in magnitude as the atomic number of alikali incereases?A. EloctrongativityB. First ionisation energyC. Ionic radiusD. Melting point |
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Answer» Correct Answer - C |
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| 978. |
The correct order regarding the solubility of alkaline earth metal chlorides in water isA. `MgCL_(2)lt CaCl_(2)ltSrCl_(2)ltBaCl_(2)`B. `CaCL_(2)gt BeCl_(2)gtBaCl_(2)gtSrCl_(2)`C. `MgCL_(2)gt CaCl_(2)gtBeCl_(2)gtSrCl_(2)`D. `MgCL_(2)gt CaCl_(2)gtSrCl_(2)gtBaCl_(2)` |
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Answer» Correct Answer - D |
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| 979. |
Questions given below are based on the following values of hydration energy and latice energy. `Li^(+) " " -499 " " Na^(+) " " -390` `K^(+) " " -305 " " Cl^(-) " " -382` Lattice energy `DeltaH_(U)` (kJ`mol^(-1)`) `LiCl " "-840` `NaCl " " -776` `KCl " " -703` Maximum heat is absorbed in the dissolution of one mole ofA. LiClB. NaClC. KClD. Equal in all |
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Answer» Correct Answer - C |
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| 980. |
Questions given below are based on the following values of hydration energy and lattice energy. `Li^(+) " " -499 " " Na^(+) " " -390` `K^(+) " " -305 " " Cl^(-) " " -382` Lattice energy `DeltaH_(U)` (kJ`mol^(-1)`) `LiCl " "-840` `NaCl " " -776` `KCl " " -703` Which salt can be used for control humidity ?A. LiClB. NaClC. KClD. none of these |
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Answer» Correct Answer - A |
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| 981. |
Of the following the commonly used as a laboratory desiccator isA. Calcium choroideB. Sodium carbonateC. Sodium chlorideD. Potaddium nitrate |
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Answer» Correct Answer - A |
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| 982. |
Which of the alkali metals has the polarizing power close to that of Magnesium ?A. LiB. NaC. KD. Rb |
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Answer» Correct Answer - A Due to identical charge / size ratio, Li and Mg have similar polarizing power. |
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| 983. |
Beryllium and aluminimum exhibit many properties which are similar . But, the two elements differ inA. Exhibiting maximum covalancy in compoundsB. Exhibiting ampohoteric nature in their oxidesC. Forming covalent halidesD. Forming polymeric hydrides |
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Answer» Correct Answer - A Be exhibits maximum covalency of four whereas Al shows maximum covalency of six. |
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| 984. |
The main reason for not using a mercury electrolytic cell in `NaOH` manufacture is thatA. Hg is toxicB. `Na^(+)` is discharged at cathodeC. Hg has vapour presureD. Hg is a good conductor of electricity |
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Answer» Correct Answer - B |
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| 985. |
`A overset(Delta)rarrB("oxide")+CO_(2)" " B+H_(2)O rarr C` `C+CO_(2) rarr A("milky")" " C+NH_(4)Cl overset(Delta)rarrD("gas")` `D+H_(2)O+CO_(2) rarrE " "E+NaCl rarrF` `F overset(Delta) Na_(2)CO_(3)+H_(2)O+CO_(2)` A isA. CaOB. `Na_(2)CO_(3)`C. `CaCO_(3)`D. `Ca(HCO_(3))_(2)` |
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Answer» Correct Answer - C |
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| 986. |
`A overset(Delta)rarrB` (oxide) `+ CO_(2)` `B + H_(2)O rarr C` `C+ CO_(2) rarrA` (milky) `C+ NH_(4)CI overset(Delta)rarr D` (gas) `D + H_(2)O + CO_(2) rarr E` `E + NaCI rarr F` `F overset(Delta)rarr Na_(2)CO_(3)+CO_(2)+H_(2)O` A is:A. `Ca(HCO_(3))_(2)`B. `CaCO_(3)`C. `CaO`D. `Na_(2)CO_(3)` |
| Answer» Correct Answer - B | |
| 987. |
`Na+Al_(2)O_(3) overset("High temp.") rarrXoverset(CO_(2)" in")underset("water")rarr Y,` compound isA. `NaAlO_(2)`B. `NaHCO_(3)`C. `Na_(2)CO_(3)`D. `Na_(2)O_(2)` |
| Answer» Correct Answer - C | |
| 988. |
`A overset(Delta)rarrB("oxide")+CO_(2)" " B+H_(2)O rarr C` `C+CO_(2) rarr A("milky")" " C+NH_(4)Cl overset(Delta)rarrD("gas")` `D+H_(2)O+CO_(2) rarrE " "E+NaCl rarrF` `F overset(Delta) Na_(2)CO_(3)+H_(2)O+CO_(2)` D, E and F areA. `NH_(3),NH_(4)Cl,NH_(4)HCO_(3)`B. `NH_(3),NH_(4)HCO_(3),NaHCO_(3)`C. `NH_(4)HCO_(3),Na_(2)CO_(3),NAHCO_(3)`D. none of the above |
| Answer» Correct Answer - B | |
| 989. |
`BaC+N_(2)overset(Delta)rarrA` `CaC_(2)+N_(2)overset(Delta)rarrB` A and B are respectively.A. `BaCN_(2),CaCN_(2)`B. `Ba(CN)_(2),Ca(CN)_(2)`C. `Ba(CN)_(2),CaCN_(2)`D. BaCN,CaCN |
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Answer» Correct Answer - 3 |
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| 990. |
`BaC_(2)+N_(2)overset(Delta)to(A),CaC_(2)+N_(2)overset(Delta)to(B)`A and B areA. `BaCN_(2) ,CaCN_(2)`B. `Ba(CN)_(2),Ca(CN)_(2)`C. `Ba(CN)_(2),CaCN_(2)`D. None is correct |
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Answer» Correct Answer - 3 |
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| 991. |
`Na_(2)O + NH_(3) rarr A + B ` `Na + NH_(3) underset("high temp")overset( "iron catalyst")(rarr) A + P uarr` thenA. `A = NaN_(3)`B. `B = NaNO_(2)`C. `A = NaNH_(2)`D. `P = N_(2)H_(4)` |
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Answer» Correct Answer - C |
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| 992. |
`E+F overset(Delta)underset(2000^(@)C)rarrCaC_(2)` " " `CaC_(2) overset (Delta)underset (N_(2))rarrD+E` ` CaC_(2) overset(H_(2)O)rarrAuarr+B` `B(aq) overset(CO_(2)" gas (excess)") rarr G` `G overset("diluteHCl")rarrH+I uarr+H_(2)O" " H overset(Na_(2)SO_(4)) rarrJ+K` [F is a crystalline solid, E is obtained in elemental from, J is percipitated out] Select correct statementA. The compound (B) is less soluble in water than (G)B. Element (E ) is a good oxidising agentC. Hydrolysis of (D) gives a gas which has carbon is sp hybridisation.D. Hydrolysis of (D) gives a gas which has nitrogen in `sp^(2)` hybridation. |
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Answer» Correct Answer - A |
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| 993. |
`E+F overset(Delta)underset(2000^(@)C)rarrCaC_(2)` `CaC_(2) overset (Delta)underset (N_(2))rarrD+E` ` CaC_(2) overset(H_(2)O)rarrAuarr+B` `B(aq) overset(CO_(2)" gas (excess)") rarr G` `G overset("diluteHCl")rarrH+I uarr+H_(2)O" " H overset(Na_(2)SO_(4)) rarrJ+K` [F is a crystalline solid, E is obtained in elemental from, J is percipitated out] Select correct statementA. Compound (K) gives white precipitte with gas (I)B. Compound (H) gives a white precipate with KFC. Compound (K) can also be obtained by the action of dilute HCl on (F)D. Compound (J) on strong heating `(gt 400^(@)C)` gives a solid residue and no gasesous products |
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Answer» Correct Answer - B |
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| 994. |
`Na+NH_(3)underset(Delta)overset("Iron catalyst")rarr(A) overset(N_(2)O)rarr(B)overset(Heat)rarrgas(X).` Which of the following is correct ?A. (A) on reaction owith water gives NaOH and `N_(2)`B. (B) contains anion of linear geometryC. (X) is a colaured gasD. all are coloured gas |
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Answer» Correct Answer - B |
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| 995. |
`("White ppt")D underset(dil. H_(2)SO_(4))overset(Na_(2)CO_(3))(larr) underset("C(White ppt)")underset(darr)A underset("(in acetic acid)")overset(K_(2)CrO_(4))(rarr)B("Yellow ppt")` If A is the metallic salt, then the white ppt. of D must be ofA. strontium carbonateB. red leadC. barium carbonateD. calcium carbonate |
| Answer» Correct Answer - C | |
| 996. |
A white solid X on heating gives a white solid Y and an acidic gas Z. Gas Z is also given out when X reacts with an acid. The compound Y is also formed if caustic soda is left open in the atmosphere. X, Y and Z areA. `{:(" "X," "Y," "Z), (NaHCO_(3), Na_(2) CO_(3), CO_(2)):}`B. `{:(" "X," "Y," "Z), (Na_(2)CO_(3), NaOH, CO_(2)):}`C. `{:(" "X," "Y," "Z), (Na_(2)CO_(3), NaHCO_(3), CO_(2)):}`D. `{:(" "X," "Y," "Z), (NaOH, NaHCO_(3), CO_(2)):}` |
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Answer» Correct Answer - A `underset(X) (2NaHCo_(3)) to underset(Y) (Na_(2)CO_(3))underset(Z)(+CO_(2)) +H_(2)O` `underset(X) (NAHCO_(3)) + HCl to NaCl+ underset(Z)(CO_(2)) +H_(2)O` `2NaOH+ underset("atmosphere")(CO_(2)) to underset(Y) (Na_(2) CO_(3)+ H_(2)O)` |
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| 997. |
A white solid (x) when heated evolves a colourless gas which does not support combusion. The residue tis dissolved in water to form (y) which can be used for white washing. When excess of `CO_(2)` is bubbled through the solution of (y), it gives a compound (z) which upon heating forms (x) Identify the compound (x). |
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Answer» The data suggests that the compound (x) is lime stone i.e., `CaCO_(3)` and the gas evoloved is carbon dioxide. The reaction that are taking place are as follows " `underset((x))(CaCO_(3)) overset("Heat")(to) CaO + CO_(2) , CaO + H_(2)O to underset((y))(Ca(OH)_(2))` `Ca(OH)_(2) + CO_(2) + H_(2)O to Ca(HCO_(3))_(2)` `underset((z))(Ca(HCO_(3))_(2)) overset("Heat")(to) underset((x))(CaCO_(3)) + H_(2)O + CO_(2)` |
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| 998. |
Assertion: Alkali metals are obtained by electrolysis of molten salt and not aqueous solution. Reason : The discharge potential of `H^(+)` ions is lower discharged at cathode instead of meta.A. Both assertion and reason are true and reason is the correct explanation of assertionB. Both assertion and reason are true but reason is not the correct explanation of assertionC. Assertion is ture but reason is falseD. But assertion and reason are false |
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Answer» Correct Answer - A The solution of alkali metal salts contain `H^(+)` ions, metal cations and `OH^(-)` anions. Since discharge potential of `H^(+)` ions is lower than `M^(+)` cations. `H^(+)` is discharged at cathode and not the metal. |
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| 999. |
Which of the following increasing order is not correct as mentioned in the property with it?A. `CsCl lt RbCl lt KCl lt NaCl lt LiCl ` (Lattice energy)B. `LiOH lt NaOHlt KOH` (Solubility in water)C. `Li^(+) lt Na^(+) lt K^(+) lt Rb^(+) lt Cs^(+)` (Size of hydrated ion)D. `NaI lt NaBr lt NaCl lt NaF` (Lattice energy) |
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Answer» Correct Answer - C Increasing size of hydrated ion `Cs^(+) lt Rb^(+) lt K^(+) Na^(+) lt Li^(+)` |
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| 1000. |
Which one of the following has a polarising power close to that of magnesium ?A. NaB. LiC. KD. Rb |
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Answer» Correct Answer - B |
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