1276 + Interview Questions in S-BLOCK-ELEMENTS IN GENERAL AWARENESS Page 13 InterviewSolution

601.	Which has the maximum electropositive character ?A. CuB. CsC. BaD. Cr
Answer» Correct Answer - B Cs being an alkali metal is maximum electropositive in nature

Discussion

602.	The reagent commonly used to determine hardness of water titrimetrically is `:`A. Oxalic acidB. Disodium of EDTAC. Sodium citrateD. Sodium thiosulphate
Answer» Correct Answer - B It forms calcium and magnesium complex with EDTA salt.

Discussion

603.	Which of the following feact only with boiling water ?A. BeB. MgC. CaD. Sr
Answer» Correct Answer - B

Discussion

604.	Among the following choose the correct order of melting pointA. `Li gt Na gt K gt Rb gt Cs`B. `Li lt Na lt K lt Rb lt Cs`C. `Li lt Na lt K gt Rb lt Cs`D. `Li lt Na gt K gt Rb lt Cs`
Answer» Correct Answer - A

Discussion

605.	NaOH is manufctured by the electrolysis of brine solution. The products of reaction areA. `Na&Cl_(2)`B. `Cl_(2)&O_(2)`C. `Cl_(2)&H_(2)`D. `Na&O_(2)`
Answer» Correct Answer - C

Discussion

606.	Sodium hydroxide is manufacture by the electrolysis of brine solution. The reaction by `-` products are `:`A. `CI_(2)` and `H_(2)`B. `Cl_(2)` and `Na-Hg`C. `Cl_(2)` and `Na`D. `CI_(2)` and `O_(2)`
Answer» Correct Answer - A

Discussion

607.	Amone the following choose the correct order of boiling points.A. `Li gt Na gt K gt Rb gt Cs`B. `Li gt Na gt K gt Rb lt Cs`C. `Li gt Na = K gt Rb gt Cs`D. `Li lt Na gt K gt Rb lt Cs`
Answer» Correct Answer - A

Discussion

608.	Alkali metal hydrides react with water to giveA. Acidic solutionB. Neutral solutionC. Alkalne solutionD. Hyeride ion
Answer» Correct Answer - C

Discussion

609.	Which of the following alkali metals form complex hydrides?A. LiB. KC. CsD. Rb
Answer» Correct Answer - A Li forms `LiAlH_(4)` as the complex hydride besides simple hydride of MH type.

Discussion

610.	Potassium when strongly heated in exygen,the compound formed in maximum quantity isA. `K_(2)O`B. `KO_(2)`C. `K_(2)O_(2)`D. `K_(2)O_(3)`
Answer» Correct Answer - B

Discussion

611.	When `MgCl_(2).6H_(2)O` is strongly heated, then if forms `:`A. `MgO`B. `Mg(OH)_(2)`C. `Mg(OH)Cl`D. `MgCl_(2)`
Answer» Correct Answer - 1 `Ca(NH)+2H_(2)OrarrCa(OH)_(2)+underset((B))(NH_(3)(g))` `underset((B))(2NH_(3))+3CaOCl_(3)rarrunderset((C ))(N_(2)(g))+3CaCl_(2)+3H_(2)O` `underset((C))(N_(2)(g))+3Mgrarrunderset((D))(MgN_(2))` `underset((D))(Mg_(3)N_(2))+6H_(2)Orarr3Mg(OH)_(2)+underset((B))(2NH_(3))`

Discussion

612.	Potassium when heated strongly in oxygen, if forms `:`A. `K_(2)O`B. `KO_(2)`C. `K_(2)O_(2)`D. KO
Answer» Correct Answer - B

Discussion

613.	the product(s) of the reaction, `Na_(2)CO_(3)+CO_(2)+H_(2)Orarr` is/areA. `2naOH+CO_(2)`B. `Na_(2)CO_(3)+ H_(2)CO_(3)`C. `2NaHCO_(3)`D. None of these
Answer» Correct Answer - C

Discussion

614.	Which of the following is known as soda ash?A. `Na_(2)CO_(3).H_(2)O`B. `NaOH`C. `NaHCO_(3)`D. `Na_(2)CO_(3)` (anhydrous )
Answer» Correct Answer - D Soda ash is chemically anhydrous `Na_(2)CO_(3)`

Discussion

615.	Alkali metal hydrides react with water to giveA. Basic solutionB. Acidic solutionC. Neutral solutionD. Hydrogen gas.
Answer» Correct Answer - A::D solution is basic and hydrogen gas is also evolved

Discussion

616.	In which of the following pairs, each member produces the same gas when reacted with water?A. `K, KO_(2)`B. `Na, Na_(2)O_(2)`C. `Ca, CaH_(2)`D. `Ba,BaO_(2)`
Answer» Correct Answer - C Both Ca and `CaH_(2)` react with water to evolve `H_(2)` gas. `Ca + 2H_(2) O to Ca(OH)_(2) + H_(2)` `CaH_(2) + 2H_(2)O to Ca(OH)_(2) + 2H_(2)`

Discussion

617.	the product(s) of the reaction, `Na_(2)CO_(3)+CO_(2)+H_(2)Orarr` is/areA. `2NaOH+CO_(2)`B. `Na_(2)CO_(3)+H_(2)CO_(3)`C. `2NaHCO_(3)`D. None of these
Answer» Correct Answer - c When sodium carbonate is treated with `CO_(2)` and `HF_(2)O` It gets converted into sodium bicarbonate. `Na_(2)CO_(#)+CO_(2)+H_(2)Orarrunderset("Sodium bicarbonate or sodium hydrogen carbonate")2NaHCO_(3)`

Discussion

618.	The propertiesas of alkali meterls are mentioed in List-I Match tyhier order of change as Present inList_II The correct match isA. `{:(A,B,C,D),(4,3,2,1):}`B. 4,3,1,2C. 3,4,1,2D. 3,4,2,1
Answer» Correct Answer - 1

Discussion

619.	Which is not a `s-` block element ?A. `[Ar]4s^(2)3d^(10)4p^(6)5s^(1)`B. `1s^(2)2s^(2)2p^(1)`C. `[He]2s^(2)2p^(6)3s^(1)`D. None of these
Answer» Correct Answer - B The block of an element depends on the type of sub- shell which receives the last electron. As last electron enters in p- subshell of outmost shell according to Aufbau rule, the element of optin `(b)` belongs to p-block.

Discussion

620.	Sodium metal cannot be stored underA. benzeneB. keroseneC. alcoholD. toluene
Answer» Correct Answer - C Na racts with alcohol, `Na+C_(2)H_(5)OH rarr C_(2)H_(5)ONa+(1)/(2) H_(2)`

Discussion

621.	The electronic configuration of an element is `1s^(2)2s^(2)2p^(6)3s^(2).` The oxidation number of the element in its compounds can beA. `+2`B. `+8`C. `+1`D. Zero
Answer» Correct Answer - 1

Discussion

622.	Which compound will liberate oxygen when reacted with waterA. `Na_(2)O`B. `Cs_(2)O_(2)`C. `KO_(2)`D. `Na_(2)O_(2)`
Answer» Correct Answer - C

Discussion

623.	Which of the following if good source of potassium ?A. ButterB. Bananas C. GheeD. Oil
Answer» Correct Answer - B

Discussion

624.	Which of the following is not known ?A. `K_(2)O`B. `K_(2)O_(2)`C. `KO_(4)`D. `KO_(3)`
Answer» Correct Answer - C `K_(2)O` is potassium oscide `,K_(2)O_(2)` is potassium peroxide `,KO_(3)` is ozonide.

Discussion

625.	Which of the following if good source of potassium ?A. ButterB. BananasC. GheeD. Oil
Answer» Correct Answer - B

Discussion

626.	The solubility of a crystalline compound in water is influenced by two factors. These are lattice enthalpy and hydration enthalpy. Lattice enthalpy is needed to separate the ions from the crystal lattice. At the same time hydration enthalpy is released when the ion are dissolved in water. The resultant of these two opposing tendencies guides the solubility of the compound in water. If lattice enthalpy has a greater magnitude, the compound has low solubility. In case hydration enthalpy is more, then the compound is highly soluble in water. The hydroxide which is maximum soluble in water is :A. `Be(OH)_(2)`B. `Mg(OH)_(2)`C. `Ba(OH)_(2)`D. `Ca(OH)_(2)`
Answer» Correct Answer - C `Ba(OH)_(2)` is the maximum soluble

Discussion

627.	Which out of the following will give basic solution ?A. Ammonium acetateB. Ammonium chlorideC. `Na_(2)CO_(3)` and `NaOH`D. `NaHCO_(3)` and `NaCI`
Answer» Correct Answer - C `Na_(2)CO_(3)` & `NaOH` form a basic solution.

Discussion

628.	If `Na` is heated in presence of air, it formsA. `Na_(2)CO_(3)`B. `Na_(2)O_(2)`C. `Na_(2)O`D. Both `(b)` and `(c)`
Answer» Correct Answer - D When `Na` is heated in presence of air or oxygen, `Na` burns to form sodium oxide and sodium peroxide.

Discussion

629.	Match list I with list II and choose the correct answer from the codes given below `{:(List I,List II),((A)NaNO_(3),(a)"Banking soda"),((B)Na(NH_(4))HPO_(4),(b)"Chile salt peter"),((C)NaHCO_(3),(c)"Microcosic salt"),((D)Na_(2)CO_(3).10H_(2)O,(d)"Washing soda"):}` Codes is:A. `{:(A,B,C,D),(a,b,c,d):}`B. `{:(A,B,C,D),(b,c,a,d):}`C. `{:(A,B,C,D),(c,a,b,d):}`D. `{:(A,B,C,D),(d,a,b,c):}`
Answer» Correct Answer - B

Discussion

630.	`NaNO_(3) overset("Heat")(to)`
Answer» `2NaNO_(3) overset("Heat")(to) 2NaNO_(2) + O_(2)`

Discussion

631.	`Li + Na_(2) overset("Heat")(to)`
Answer» `Li + N_(2) overset("Heat")(to) underset("Lithium nitride")(2Li_(3)N)`

Discussion

632.	How will you distinguish between (i) `Na_(2)CO_(3)` and `NaHCO_(3)` and (ii) `LiNO_(3)` and `KNO_(3)` ?
Answer» (i) `NaHCO_(3)` on heating decomposes to produce `CO_(2)` gas which turns lime water milky `2 NaHCO_(3) overset(Delta)(to) Na_(2)CO_(3) + CO_(2) + H_(2)O` `Na_(2)CO_(3)` , however , is stable to heat . (ii) `LiNO_(3)` on heating gives reddish brown vapours of `NO_(2)` whereas `KNO_(3)` on decomposition gives colourless `O_(2) ` gas . `4 LiNO_(3) overset(Delta)(to) 2 Li_(2)O + 4NO_(2) + O_(2) " " , 2 KNO_(3) overset(Delta)(to) 2 KNO_(2) + O_(2)`

Discussion

633.	Correct order of density is-A. `Li gt Na`B. `K gt Na`C. `Mg gt Ca`D. `Cs lt Rb`
Answer» Correct Answer - C

Discussion

634.	Which is having highest m.p-A. `Be`B. `Mg`C. `Ca`D. `Sr`
Answer» Correct Answer - A

Discussion

635.	Weak reductant in alkali metal is-A. `Li`B. `Na`C. KD. `Cs`
Answer» Correct Answer - B

Discussion

636.	The alkali metal used in photoelectric cell isA. KB. CsC. LiD. Fr
Answer» Correct Answer - B Cs with low IE is used in photoelectric cells.

Discussion

637.	The metal used in photoelectric cell is-A. `Na`B. KC. `Mg`D. `Ca`
Answer» Correct Answer - B

Discussion

638.	Lithium chloride is highly soluble in-A. `C_(6)H_(6)`B. `H_(2)O`C. `D_(2)O`D. All
Answer» Correct Answer - A

Discussion

639.	A sodium salt on treatment with `MgCl_(2)` gives white precipitate only on heating. The anion of the sodium salt is `:`A. `HCO_(3)^(-)`B. `CO_(2)^(2-)`C. `NO_(3)^(-)`D. `SO_(4)^(-)`
Answer» Correct Answer - A The anion is `HCO_(3)^(-)` and it reacts with `MgCI_(2)` as follows: `2NaHCO_(3) + MgCI_(2) to Mg (HCO_(3))_(2) + 2NaCI` `Mg(HCO_(3))_(2) overset("Heat")(to) MgCO_(3) + CO_(2) + H_(2)O`

Discussion

640.	Which one of the following is/are acid slat/s ?A. `NaH_(2)PO_(2)`B. `NaH_(2) PO_(3)`C. `NaH_(2)PO_(4)`D. All are acid salts
Answer» Correct Answer - D

Discussion

641.	Match the column I with column II and mark the appropriate choice. A. `(A) to (i), B to (ii), (C ) to (iii) , (D) to (iv) `B. `(A) to (ii), B to (iv), (C ) to (i) , (D) to (iii) `C. `(A) to (iv), B to (iii), (C ) to (ii) , (D) to (i) `D. `(A) to (iii), B to (iv), (C ) to (i) , (D) to (ii) `
Answer» Correct Answer - B

Discussion

642.	Which one is precipitated in ionic form on Ptelectode ?A. `Li^(++)`B. `Na^(++)`C. `Mg^(++)`D. `Ca^(++)`
Answer» Correct Answer - C

Discussion

643.	Which of the following has the largest ionic radius ?A. `Be^(2+)`B. `Mg^(2+)`C. `Ca^(2+)`D. `Sr^(2+)`
Answer» Correct Answer - D

Discussion

644.	Assertion : Among alkali metal cations,` Li^(+)(aq)` has the highest electrical conductance. Reason : `Li^(+)(aq)` is the largest alkali metal cation because of greater degree of hydration.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.
Answer» Correct Answer - d Reason is correct and, thus conductance of `Li^(+)` is lowest among alkali metal cations.

Discussion

645.	The species having largest size isA. NaB. `Na^(+)`C. KD. `K^(+)`
Answer» Correct Answer - A

Discussion

646.	The reaction of water with Na and K isA. ReversibleB. `Irreverisible and endothermicC. ExothermicD. Endothermic
Answer» Correct Answer - C

Discussion

647.	The electronic configuration of two neutral elements A and B are `A= 1s^(2) 2s^(2) 2p^(6) 3s^(2)` `B=1s^(2) 2s^(2) 2p^(5)` Which of the following represents the structure of the compound formed by them ?A. `A ^(2+) B ^(2-)`B. `B^(2-) (A ^(-))_(2)`C. `A^(2+) (B^(-))_(2)`D. `A^(+)B^(-)`
Answer» Correct Answer - C A loses two electrons to form `A^(2+)` while two atoms of B lose one electron each to from `2B^(-).` Therefore, the formula of the compound is `A^(2+)(B^(-))_(2).`

Discussion

648.	What is X in the following reaction ? `MgCl_(2) +2H_92) O to X+ 2HCl +H_(2)O`A. MgOB. MgC. `Mg(OH)_(2)`D. `Mg(OH)Cl`
Answer» Correct Answer - A `MgCl _(2) +2H_(2)O to MgO+ 2HCl +H_(2)O`

Discussion

649.	The molarity of `Na^(+)`, when the average concentration of `Na^(+)` in human blood serum is about 3.4 g `L^(-1)`, isA. 8.4B. 2.3C. 0.68D. 0.15
Answer» Correct Answer - d Molarity (M) `=("Weight of solute//litre of solution")/("Molecular weight of solute")` `=(3.4gL^(-1))/(21.2)=0.15`

Discussion

650.	With reference of the above question, if the solution above is concentrated, then :A. blue colour remains as it isB. blue colour changes to to bronze colourC. solutions becomes completely diamagneticD. both (b) and (c)
Answer» Correct Answer - B Conc. Of ammoniated `e^(-)` decreases.

Discussion

Explore topic-wise InterviewSolutions in .

Which has the maximum electropositive character ?A. CuB. CsC. BaD. Cr

The reagent commonly used to determine hardness of water titrimetrically is `:`A. Oxalic acidB. Disodium of EDTAC. Sodium citrateD. Sodium thiosulphate

Which of the following feact only with boiling water ?A. BeB. MgC. CaD. Sr

Among the following choose the correct order of melting pointA. `Li gt Na gt K gt Rb gt Cs`B. `Li lt Na lt K lt Rb lt Cs`C. `Li lt Na lt K gt Rb lt Cs`D. `Li lt Na gt K gt Rb lt Cs`

NaOH is manufctured by the electrolysis of brine solution. The products of reaction areA. `Na&Cl_(2)`B. `Cl_(2)&O_(2)`C. `Cl_(2)&H_(2)`D. `Na&O_(2)`

Sodium hydroxide is manufacture by the electrolysis of brine solution. The reaction by `-` products are `:`A. `CI_(2)` and `H_(2)`B. `Cl_(2)` and `Na-Hg`C. `Cl_(2)` and `Na`D. `CI_(2)` and `O_(2)`

Amone the following choose the correct order of boiling points.A. `Li gt Na gt K gt Rb gt Cs`B. `Li gt Na gt K gt Rb lt Cs`C. `Li gt Na = K gt Rb gt Cs`D. `Li lt Na gt K gt Rb lt Cs`

Alkali metal hydrides react with water to giveA. Acidic solutionB. Neutral solutionC. Alkalne solutionD. Hyeride ion

Which of the following alkali metals form complex hydrides?A. LiB. KC. CsD. Rb

Potassium when strongly heated in exygen,the compound formed in maximum quantity isA. `K_(2)O`B. `KO_(2)`C. `K_(2)O_(2)`D. `K_(2)O_(3)`

When `MgCl_(2).6H_(2)O` is strongly heated, then if forms `:`A. `MgO`B. `Mg(OH)_(2)`C. `Mg(OH)Cl`D. `MgCl_(2)`

Potassium when heated strongly in oxygen, if forms `:`A. `K_(2)O`B. `KO_(2)`C. `K_(2)O_(2)`D. KO

the product(s) of the reaction, `Na_(2)CO_(3)+CO_(2)+H_(2)Orarr` is/areA. `2naOH+CO_(2)`B. `Na_(2)CO_(3)+ H_(2)CO_(3)`C. `2NaHCO_(3)`D. None of these

Which of the following is known as soda ash?A. `Na_(2)CO_(3).H_(2)O`B. `NaOH`C. `NaHCO_(3)`D. `Na_(2)CO_(3)` (anhydrous )

Alkali metal hydrides react with water to giveA. Basic solutionB. Acidic solutionC. Neutral solutionD. Hydrogen gas.

In which of the following pairs, each member produces the same gas when reacted with water?A. `K, KO_(2)`B. `Na, Na_(2)O_(2)`C. `Ca, CaH_(2)`D. `Ba,BaO_(2)`

the product(s) of the reaction, `Na_(2)CO_(3)+CO_(2)+H_(2)Orarr` is/areA. `2NaOH+CO_(2)`B. `Na_(2)CO_(3)+H_(2)CO_(3)`C. `2NaHCO_(3)`D. None of these

The propertiesas of alkali meterls are mentioed in List-I Match tyhier order of change as Present inList_II The correct match isA. `{:(A,B,C,D),(4,3,2,1):}`B. 4,3,1,2C. 3,4,1,2D. 3,4,2,1

Which is not a `s-` block element ?A. `[Ar]4s^(2)3d^(10)4p^(6)5s^(1)`B. `1s^(2)2s^(2)2p^(1)`C. `[He]2s^(2)2p^(6)3s^(1)`D. None of these

Sodium metal cannot be stored underA. benzeneB. keroseneC. alcoholD. toluene

The electronic configuration of an element is `1s^(2)2s^(2)2p^(6)3s^(2).` The oxidation number of the element in its compounds can beA. `+2`B. `+8`C. `+1`D. Zero

Which compound will liberate oxygen when reacted with waterA. `Na_(2)O`B. `Cs_(2)O_(2)`C. `KO_(2)`D. `Na_(2)O_(2)`

Which of the following if good source of potassium ?A. ButterB. Bananas C. GheeD. Oil

Which of the following is not known ?A. `K_(2)O`B. `K_(2)O_(2)`C. `KO_(4)`D. `KO_(3)`

Which of the following if good source of potassium ?A. ButterB. BananasC. GheeD. Oil

Which out of the following will give basic solution ?A. Ammonium acetateB. Ammonium chlorideC. `Na_(2)CO_(3)` and `NaOH`D. `NaHCO_(3)` and `NaCI`

If `Na` is heated in presence of air, it formsA. `Na_(2)CO_(3)`B. `Na_(2)O_(2)`C. `Na_(2)O`D. Both `(b)` and `(c)`

`NaNO_(3) overset("Heat")(to)`

`Li + Na_(2) overset("Heat")(to)`

How will you distinguish between (i) `Na_(2)CO_(3)` and `NaHCO_(3)` and (ii) `LiNO_(3)` and `KNO_(3)` ?

Correct order of density is-A. `Li gt Na`B. `K gt Na`C. `Mg gt Ca`D. `Cs lt Rb`

Which is having highest m.p-A. `Be`B. `Mg`C. `Ca`D. `Sr`

Weak reductant in alkali metal is-A. `Li`B. `Na`C. KD. `Cs`

The alkali metal used in photoelectric cell isA. KB. CsC. LiD. Fr

The metal used in photoelectric cell is-A. `Na`B. KC. `Mg`D. `Ca`

Lithium chloride is highly soluble in-A. `C_(6)H_(6)`B. `H_(2)O`C. `D_(2)O`D. All

A sodium salt on treatment with `MgCl_(2)` gives white precipitate only on heating. The anion of the sodium salt is `:`A. `HCO_(3)^(-)`B. `CO_(2)^(2-)`C. `NO_(3)^(-)`D. `SO_(4)^(-)`

Which one of the following is/are acid slat/s ?A. `NaH_(2)PO_(2)`B. `NaH_(2) PO_(3)`C. `NaH_(2)PO_(4)`D. All are acid salts

Match the column I with column II and mark the appropriate choice. A. `(A) to (i), B to (ii), (C ) to (iii) , (D) to (iv) `B. `(A) to (ii), B to (iv), (C ) to (i) , (D) to (iii) `C. `(A) to (iv), B to (iii), (C ) to (ii) , (D) to (i) `D. `(A) to (iii), B to (iv), (C ) to (i) , (D) to (ii) `

Which one is precipitated in ionic form on Ptelectode ?A. `Li^(++)`B. `Na^(++)`C. `Mg^(++)`D. `Ca^(++)`

Which of the following has the largest ionic radius ?A. `Be^(2+)`B. `Mg^(2+)`C. `Ca^(2+)`D. `Sr^(2+)`

The species having largest size isA. NaB. `Na^(+)`C. KD. `K^(+)`

The reaction of water with Na and K isA. ReversibleB. `Irreverisible and endothermicC. ExothermicD. Endothermic

The electronic configuration of two neutral elements A and B are `A= 1s^(2) 2s^(2) 2p^(6) 3s^(2)` `B=1s^(2) 2s^(2) 2p^(5)` Which of the following represents the structure of the compound formed by them ?A. `A ^(2+) B ^(2-)`B. `B^(2-) (A ^(-))_(2)`C. `A^(2+) (B^(-))_(2)`D. `A^(+)B^(-)`

What is X in the following reaction ? `MgCl_(2) +2H_92) O to X+ 2HCl +H_(2)O`A. MgOB. MgC. `Mg(OH)_(2)`D. `Mg(OH)Cl`

The molarity of `Na^(+)`, when the average concentration of `Na^(+)` in human blood serum is about 3.4 g `L^(-1)`, isA. 8.4B. 2.3C. 0.68D. 0.15

With reference of the above question, if the solution above is concentrated, then :A. blue colour remains as it isB. blue colour changes to to bronze colourC. solutions becomes completely diamagneticD. both (b) and (c)