1276 + Interview Questions in S-BLOCK-ELEMENTS IN GENERAL AWARENESS Page 24 InterviewSolution

1151.	Caliche isA. `NaNO_(3)-NaIO_(3)`B. NaIOC. `NaNO_(2)-NaIO_(3)`D. `NaNO_(3)-I`
Answer» Correct Answer - A

Discussion

1152.	Slaked lime is obtained when water is added toA. `CaSO_(4)(1)/(2)H_(2)O`B. `CaCl_(2)`C. CaOD. `CaCO_(3)`
Answer» Correct Answer - 3

Discussion

1153.	A solution of sodium metal in liquid ammonia is strongly reducing due to the presence ofA. sodium atomsB. sodium hydrideC. sodium amideD. solvated electrons
Answer» Correct Answer - D `M+(x+y)NH_(3) rarr [M(NH_(3))_(x)]^(+)+[e(NH_(3))_(y)]^(-)` solution contains unpaired solvated electrons which are responsible for their strongly reducing and highly conducting nature.

Discussion

1154.	Which of the following statement is not correct?A. NaHCO_(3) is more soluble than `Na_(2)CO_(3)`B. NaOH is known as caustic sodaC. `NaHCO_(3)` is used as an antacidD. `Na_(2)CO_(3)` is used in the manufacture of sopa and glass
Answer» Correct Answer - A

Discussion

1155.	Which of the following compound of cement sets at the slowest rate?A. Dicalcium silicateB. Tricalcium silicateC. Trtra calcium aluminateD. Tetra calcium alumino ferrite
Answer» Correct Answer - 3

Discussion

1156.	A solution of sodium metal in liquid ammonia is strongly reducing due to the presence ofA. solvated sodium ionsB. solvated hydrogen ionsC. sodium atoms or sodium hydroxideD. solvated electrons
Answer» Correct Answer - D

Discussion

1157.	`Boverset(200^(@)C) leftarrowCaSO_(4).2H_(2)Ounderset(Heat)overset(120^(@)C)toA` `Boverset ("stronglyheated")toC" here"` A,B andC RespecetivlyA. Plaster of pariis ,Dead bead purnt plaster , calcium sulphideB. Dead burnt of plaster,plaster of paris ,limeC. Plaster of paris ,dead burnt plaster ,limeD. Anhydroous calcium sulphate ,plaster of paris calcium sulphite
Answer» Correct Answer - 3

Discussion

1158.	Which of the following statement is not correct?A. KCl is a substitute for NaCl for patients of high blood pressureB. KOH is a stronger alkali than NaOHC. KOH is used in the manufacture of soft soapD. NaOH is a non-deliquescent white crystalline solid
Answer» Correct Answer - D

Discussion

1159.	In the following reaction, `NaOH+S to A+Na_(2)S+h_(2)O,` A isA. `Na_(2) SO_(4)`B. `Na_(2)SO_(3)`C. `Na_(2)S`D. `Na_(2)S_(2)O_(3)`
Answer» Correct Answer - D

Discussion

1160.	In curing cement plasters, water is sprinkled from time to time. This helps inA. Converting sand into silcic acidB. Keeping it coolC. Developing interlocking needle like crystals of hydrated silicatesD. hydrating sand and gravel mixed with cement
Answer» Correct Answer - 2

Discussion

1161.	In curing cement plasters, water is sprinkled from time to time. This helps inA. hydrating sand and gravel mixed with cementB. converting sand into silicateC. developing interlocking needle like crystal of hydrated silicatesD. Keeping it cool
Answer» Correct Answer - C

Discussion

1162.	In curing cement plasters, water is sprinkled from time to time. This helps inA. converting sand into silicic acidB. keeping it coolC. developing interlocking needle like cyrstals of hydrated silicatesD. hydraling sand and gravel mixded with cement
Answer» Correct Answer - c Water is sprinkled on cement plasters to bind hydrated crystais of silicates to one another.

Discussion

1163.	Among the carbonates of alkali metals which one has highest thermal stability ?A. `Cs_(2)CO_(3)`B. `Rb_(2)CO_(3)`C. `K_(2)CO_(3)`D. `Na_(2)CO_(3)`
Answer» Correct Answer - A

Discussion

1164.	Which of the following hydride is not ionic?A. `CaH_(2)`B. `BaH_(2)`C. `SrH_(2)`D. `BeH_(2)`
Answer» Correct Answer - D

Discussion

1165.	A compound A on heating gives a colourless gas and a residue that is dissolved in water to obtained B . Excess of `CO_(2)` is bubbled through aqueous solution of B , C is formed which is recovered in the solid form . Solid C on gentle heating gives back A . The compound isA. `CaCO_(3)`B. `Na_(2)CO_(3)`C. `K_(2)CO_(3)`D. `CaSO_(4) . 2 H_(2)O`
Answer» Correct Answer - A `underset((A))(CaC)O_(3)(s) overset(Delta)(to) CO_(2) (g) + CaO(s)` `CaO (s) + H_(2)O (l) to underset((B))(Ca(OH)_(2)) (aq)` `underset((B)) (Ca(OH)_(2)) (aq) + underset(("excess"))(2 CO_(2)) (g) to Caunderset((C))((HCO_(3))_(2)) (aq) ` `Caunderset((C))((HCO_(3))_(2)) (aq) overset(Delta)(to) Ca underset((A))(CO_(3)) (s) + CO_(2) (g) + H_(2)O(l)`

Discussion

1166.	On heating which of the following release `CO_(2)` most easily ?A. `Na_(2)CO_(3)`B. `MgCO_(3)`C. `CaCO_(3)`D. `K_(2)CO_(3)`
Answer» Correct Answer - B Alkali metal carbonates (except `Li_(2)CO_(3)`) are more stable than alkaline metal carbonates . Among alkaline earth metal carbonates , thermal stability increases down the group . Thus , `MgCO_(3)` decomposes most easily .

Discussion

1167.	On heating which of the following release `CO_(2)` most easily ?A. `MgCO_(3)`B. `CaCO_(3)`C. `K_(2)CO_(3)`D. `Na_(2)CO_(3)`
Answer» Correct Answer - A Thermal stability order `K_(2)CO_(3)gtNa_(2)CO_(3)gtCaCO_(3)gtMaCO_(3)` Therefore, `MgCO_(3)` releases `CO_(2)` most easily `MgCO_(3) overset(Delta)rarr MgO+CO_(2)`

Discussion

1168.	Which of the following statements is false ?A. `Ca^(2+)` ion are not important in maintaing the regular beating of the heartB. `Mg^(2+)` ions are are important in the green parts of the plantsC. `Mg^(2+)` ions form a complex with ATPD. `Ca^(2+)` ions are important in blood clotting
Answer» Correct Answer - A `Ca^(2+)` ions are needed to carry the contraction of muscles and to help in maintaining the regular heart beats.

Discussion

1169.	The function of `"`Sodium pump`"` is a biological process operating in each and every cell of all animals. Which of the following biologicaly important ions is also constant f this pump ?A. `Mg^(2+)`B. `K^(+)`C. `Fe^(2+)`D. `Ca^(2+)`
Answer» Correct Answer - B `K^(+)` ion is a constant of sodium pump.

Discussion

1170.	Assertion: Chlorides of `Li, Be` and Mg are covalent in nature Reason: `Li, Be` and Mg have large cationic size in the s-block elementsA. If both Assertion & Reason are True & the Reason is a correct explanation of the AssertionB. If both Assertion & Reason are True but Reason is not a correct explanation of the AssertionC. If Assertion is True but the Reason is FalseD. If both Assertion & Reason are False
Answer» Correct Answer - C

Discussion

1171.	Assertion (A): Barium is not required for normal biological function in human beings. Reason (R ): Barium does not show variable oxidation states.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 - b It is true that barium is not required for normal biological function in human beings and it is also true that it does not show variable oxidation stat. It only shows `+2` oxidation state.

Discussion

1172.	The function of `"`Sodium pump`"` is a biological process operating in each and every cell of all animals. Which of the following biologicaly important ions is also constant f this pump ?A. `K^(+)`B. `Fe^(2+)`C. `Ca^(2+)`D. `Mg^(2+)`
Answer» Correct Answer - A `K^(+)` ions are the constituent of sodium pump

Discussion

1173.	Assertion: Barium is not required for normal biological function in human. Reason: Barium does not show variable oxidation state.A. If both Assertion & Reason are True & the Reason is a correct explanation of the AssertionB. If both Assertion & Reason are True but Reason is not a correct explanation of the AssertionC. If Assertion is True but the Reason is FalseD. If both Assertion & Reason are False
Answer» Correct Answer - B

Discussion

1174.	Which of the following biological activity is not related with calcium ?A. Interneuronal transmissionB. Cell membrane intergityC. Photosynthesis by chlorophyllD. Muscular functioning
Answer» Correct Answer - C

Discussion

1175.	Match the compounds listed in column -I with the characteristic(s) listed in column-II.
Answer» Correct Answer - A-p ; B-p,q,s,t ; C-t ; D-q,r

Discussion

1176.	Which of the following substance on heating liberates two different gases which can be attracted into the applied magnetic fieldA. `LiNO_(3)`B. `NaNO_(3)`C. `Li_(2)CO_(3)`D. `NaHCO_(3)`
Answer» Correct Answer - A

Discussion

1177.	Calcium oxide is calledA. Quick limeB. Milk of limeC. LimestoneD. Slaked lime
Answer» Correct Answer - A

Discussion

1178.	Which of the folowing compounds liberates oxygen on heating?A. `Li_(2)CO_(3)`B. `LiOH`C. `LiNO_(3)`D. NaOH
Answer» Correct Answer - C

Discussion

1179.	Both Be & Al reacts with sodium hydroxide and liberatesA. `O_(2)`B. `N_(2)`C. `H_(2)`D. `H_(2)O`
Answer» Correct Answer - 3

Discussion

1180.	The commerical name for calcium oxide is :A. quick limeB. milk of limeC. limestoneD. slaked lime
Answer» Correct Answer - A

Discussion

1181.	A metallic oxide reacts with water to form its hydroxide hydrogen peroxide and also liberates oxygen. The metallic oxide could be :A. `CaO`B. `KO_(2)`C. `Li_(2)O`D. `Na_(2)O_(2)`
Answer» Correct Answer - B The metal oxide is `KO_(2)`. It is potassium superoxide and reacts with water as follows: `2KO_(2) + 2H_(2)O to 2KOH + H_(2)O_(2) + O_(2)`

Discussion

1182.	The correct statement for the molecule, `CsI_(3)` isA. It is a covalent moleculeB. It contains `Cs^(+)` and `I_(3)^(-)` ionsC. It contains `Cs^(3+)` and `I^(-)` ionsD. It contains `Cs^(+), I^(-)` and lattice molecule
Answer» Correct Answer - B `CsI_(3)` is made of `Cs^(+)` and `I_(3)^(-)` ions `(I^(-) â€¦. I^(delta +) - I^(delta -))` formed due to ion-dipolar interaction.

Discussion

1183.	The correct statement for the molecule `csI_(3)` is .A. It contains `Cs^(3+)" and "I^(-)` ionsB. It contains `Cs^(+),I^(-)` and lattice `I_(2)`C. It is a covalent moleculeD. It contains `Cs^(+)" and I_(3)^(-)` ions
Answer» Correct Answer - D

Discussion

1184.	Which of the following properties of lithium cannot be attributed to its anomalous propertiesA. Lithium chloride crystallizes as hydrated lithium chloride .B. Lithium cannot crystallizes as hydrated lithium chloride.C. Lithium dissolves in ammonia to form blue coloured paramegnetic solution .D. Lithium bicarbonate exists only in solution.
Answer» Correct Answer - C

Discussion

1185.	At high temperature, nitrogen combines with `CaC_(2)` to give `:`A. Calcium cyanideB. Calcium cyanamideC. Calcium carbonateD. Calcium nitride
Answer» Correct Answer - B

Discussion

1186.	At the occasion of marriage , the fire workds are used, which of the following gives green flame ?A. NaB. KC. BaD. Ca
Answer» Correct Answer - C Ba. Barium salts give green flame.

Discussion

1187.	Four moles of `NaNO_(3)` when heated to `800^(@)` C , totally how many moles of paramagnetic gas molecules liberated ?
Answer» Correct Answer - 2

Discussion

1188.	How many of the following are anomalous properties of lithium ? (i) Hydrated lithium ion is the largest among alkali metals . (ii) The melting and boiling points of lithium are comparatively high . (iii) Lithium directly reacts with atmospheric nitrogen on heating . (iv) Lithium chloride is the only hydrated salt , among all alkali chlorides . (v) Lithium salts shows crimson red colour in flame test . (vi) Lithium is softer than that of other alkali metals . (vii) Lithium reacts directly with carbon to form an ionic carbide .
Answer» Correct Answer - 5

Discussion

1189.	Compounds of alkaline earth metals are less soluble in water than the corresponding alkali metal salts due to :A. Lower lattice energiesB. Higher ionization enthalpiesC. Higher covalent characterD. Higher ionic character
Answer» Correct Answer - C Higher covalent character. According to Fajan ruled, lower the size of the cation (alkaline earth metal cations are smaller in size that alkali metal cations), higher is the covalency.

Discussion

1190.	Compounds of alkaline earth metals are less soluble in water than the corresponding alkali metal salts due to :A. Theior high ionistion energyB. Their low electronegtivityC. Their low huydration energyD. Their high lattice energy
Answer» Correct Answer - D

Discussion

1191.	Compounds of alkaline earth metals are less soluble in water than the corresponding alkali metal salts due to :A. their high ionisation energyB. their low electronegativityC. their low hydration energyD. their high lattice energy
Answer» Correct Answer - D Along the period , atomic size decreases and nuclear charge increases and thus lattic energy increases. Lattice energy `prop ("Charge on cation")/("Size of cation ")`

Discussion

1192.	The order of decreasing ionisation enthalpy in alkali metals isA. `Na gt Li gt K gt Rb`B. `Rb lt Na lt K lt Li`C. `Li gt Na gt K gt Rb`D. `K lt Li lt Na lt Rb`
Answer» Correct Answer - C Ionization enthalpy decreases as the atomic size , increases , i.e., `Li gt Na gt K gt Rb`.

Discussion

1193.	Alkali metals readily react with oxyacids forming corresponding salts like `M_(2)CO_(3),MHCO_(3),MNO_(3),M_(2)SO_(4)` etc. with evolution of hydrogen. The also dissolve in liquid `NH_(3)` but without the evolution of hydrogen. The colour of its dilute solution is blue but when it is heated and concentrated then is colour becomes bronze. Among the nitrate the alkali metals which one can be decomposed to its oxide easily?A. `NaNO_(3)`B. `KNO_(3)`C. `LiNO_(3)`D. `RbNO_(3)`
Answer» Correct Answer - C

Discussion

1194.	Alkali metals readily react with oxyacids forming corresponding salts like `M_(2)CO_(3),MHCO_(3),MNO_(3),M_(2)SO_(4)` etc. with evolution of hydrogen. The also dissolve in liquid `NH_(3)` but without the evolution of hydrogen. The colour of its dilute solution is blue but when it is heated and concentrated then is colour becomes bronze. Which metal bicarbonate does not exist in solid state? `{:(,(P),LiHCO_(3)," ",(Q),Ca(HCO_(3))_(2)),(,(R),Zn(HCO_(3))_(2)," ",(S),NaHCO_(3)),(,(T),AgHCO_(3)," ",,):}`A. P,Q,R and TB. P,Q and RC. P,Q and TD. Q,R and S
Answer» Correct Answer - A Only alkali metal bicarbonates exist in solid state, with the exception of `LiHCO_(3).`

Discussion

1195.	Metallic elements are described by their standard electrode potential , fusion enthalpy , atomic size , etc . The alkali metals are characterised by which of the following properties ?A. High boiling pointB. High negative standard electrode potentialC. High densityD. Large atomic size
Answer» Correct Answer - B::D Alkali metals have high negative standard electrode potential and large atomic size .

Discussion

1196.	Metallic elements are described by their standard electrode potential, fusion enthalpy, atomic size, etc. The alkali metals are characerised by which of the following properties?A. High boiling pointB. High negative standard electrode potentialC. High densityD. Large atomic size
Answer» Correct Answer - B::D (b) and (d) are both correct

Discussion

1197.	Both Be and Al become passive on reaction with conc. nitric acid due to-A. The non-reactive nature of the metalB. The non-reactive nature of the acidC. The formation of an inert layer of oxide on the sueface of the metalsD. Formaation of acitive of oxide on the surface of metals.
Answer» Correct Answer - 3

Discussion

1198.	Excess of Li and Mg are allowed to react separately with 1 mole of `N_(2)` gas, ration of gaseous product obrained in complate hydrolysis of both compounds:A. `1:2`B. `2:1`C. `1:1`D. `2:3`
Answer» Correct Answer - C

Discussion

1199.	Give reasons for the following : (i) `MgCl_(2)` is more covalent than NaCl (ii) CuCl is more covalent than NaCl.
Answer» (i) Due to higher charge , `Mg^(2)` is more polarising than `Na^(+)` and hence `MgCl_(2)` is more covalent than NaCl. (ii) Due to pseudo inert gas configuration , `Cu^(+)` is more polarising than `Na^(+)` and hence CuCl is more covalent than NaCl .

Discussion

1200.	Give reasons for the following : (i) `Be(OH)_(2)` dissolves in NaOH but `Mg(OH)_(2)` does not . (ii) Magnesium oxide is used as a refractors material , (iii) During electrolysis of molten sodium chlorides , calcium chloride and potassium fluoride are added .
Answer» (i) `Be(OH)_(2)` is amphoteric and hence it dissolves in NaOH forming sodium beryllate `Be(OH)_(2) + 2NaOH to Na_(2)BeO_(2) + 2H_(2)O` `Mg(OH)_(2)` on the other hand , basic does not dissolve in NaOH. (ii) MgO has high lattice energy due to greater charge and smaller ionic size of `Mg^(2+)` and `O^(2-)` ions . As a result , it has a very high melting point and hence is used as a refractory material . (iii) Pure sodium chloride metals at 1084 K . The cost of electricity to attain and maintain this temperature is very high . Furthermore , `Cl_(2)` gas evolved during electrolysis has corrosive action on the cell at high temperatures . Therefore , to lower the fusion temperature to 850-875 K , some `CaCl_(2)` and KF are added to molten NaCl.

Discussion

Explore topic-wise InterviewSolutions in .

Caliche isA. `NaNO_(3)-NaIO_(3)`B. NaIOC. `NaNO_(2)-NaIO_(3)`D. `NaNO_(3)-I`

Slaked lime is obtained when water is added toA. `CaSO_(4)(1)/(2)H_(2)O`B. `CaCl_(2)`C. CaOD. `CaCO_(3)`

A solution of sodium metal in liquid ammonia is strongly reducing due to the presence ofA. sodium atomsB. sodium hydrideC. sodium amideD. solvated electrons

Which of the following statement is not correct?A. NaHCO_(3) is more soluble than `Na_(2)CO_(3)`B. NaOH is known as caustic sodaC. `NaHCO_(3)` is used as an antacidD. `Na_(2)CO_(3)` is used in the manufacture of sopa and glass

Which of the following compound of cement sets at the slowest rate?A. Dicalcium silicateB. Tricalcium silicateC. Trtra calcium aluminateD. Tetra calcium alumino ferrite

A solution of sodium metal in liquid ammonia is strongly reducing due to the presence ofA. solvated sodium ionsB. solvated hydrogen ionsC. sodium atoms or sodium hydroxideD. solvated electrons

Which of the following statement is not correct?A. KCl is a substitute for NaCl for patients of high blood pressureB. KOH is a stronger alkali than NaOHC. KOH is used in the manufacture of soft soapD. NaOH is a non-deliquescent white crystalline solid

In the following reaction, `NaOH+S to A+Na_(2)S+h_(2)O,` A isA. `Na_(2) SO_(4)`B. `Na_(2)SO_(3)`C. `Na_(2)S`D. `Na_(2)S_(2)O_(3)`

In curing cement plasters, water is sprinkled from time to time. This helps inA. Converting sand into silcic acidB. Keeping it coolC. Developing interlocking needle like crystals of hydrated silicatesD. hydrating sand and gravel mixed with cement

In curing cement plasters, water is sprinkled from time to time. This helps inA. hydrating sand and gravel mixed with cementB. converting sand into silicateC. developing interlocking needle like crystal of hydrated silicatesD. Keeping it cool

In curing cement plasters, water is sprinkled from time to time. This helps inA. converting sand into silicic acidB. keeping it coolC. developing interlocking needle like cyrstals of hydrated silicatesD. hydraling sand and gravel mixded with cement

Among the carbonates of alkali metals which one has highest thermal stability ?A. `Cs_(2)CO_(3)`B. `Rb_(2)CO_(3)`C. `K_(2)CO_(3)`D. `Na_(2)CO_(3)`

Which of the following hydride is not ionic?A. `CaH_(2)`B. `BaH_(2)`C. `SrH_(2)`D. `BeH_(2)`

On heating which of the following release `CO_(2)` most easily ?A. `Na_(2)CO_(3)`B. `MgCO_(3)`C. `CaCO_(3)`D. `K_(2)CO_(3)`

On heating which of the following release `CO_(2)` most easily ?A. `MgCO_(3)`B. `CaCO_(3)`C. `K_(2)CO_(3)`D. `Na_(2)CO_(3)`

Which of the following statements is false ?A. `Ca^(2+)` ion are not important in maintaing the regular beating of the heartB. `Mg^(2+)` ions are are important in the green parts of the plantsC. `Mg^(2+)` ions form a complex with ATPD. `Ca^(2+)` ions are important in blood clotting

The function of `"`Sodium pump`"` is a biological process operating in each and every cell of all animals. Which of the following biologicaly important ions is also constant f this pump ?A. `Mg^(2+)`B. `K^(+)`C. `Fe^(2+)`D. `Ca^(2+)`

The function of `"`Sodium pump`"` is a biological process operating in each and every cell of all animals. Which of the following biologicaly important ions is also constant f this pump ?A. `K^(+)`B. `Fe^(2+)`C. `Ca^(2+)`D. `Mg^(2+)`

Which of the following biological activity is not related with calcium ?A. Interneuronal transmissionB. Cell membrane intergityC. Photosynthesis by chlorophyllD. Muscular functioning

Match the compounds listed in column -I with the characteristic(s) listed in column-II.

Which of the following substance on heating liberates two different gases which can be attracted into the applied magnetic fieldA. `LiNO_(3)`B. `NaNO_(3)`C. `Li_(2)CO_(3)`D. `NaHCO_(3)`

Calcium oxide is calledA. Quick limeB. Milk of limeC. LimestoneD. Slaked lime

Which of the folowing compounds liberates oxygen on heating?A. `Li_(2)CO_(3)`B. `LiOH`C. `LiNO_(3)`D. NaOH

Both Be & Al reacts with sodium hydroxide and liberatesA. `O_(2)`B. `N_(2)`C. `H_(2)`D. `H_(2)O`

The commerical name for calcium oxide is :A. quick limeB. milk of limeC. limestoneD. slaked lime

A metallic oxide reacts with water to form its hydroxide hydrogen peroxide and also liberates oxygen. The metallic oxide could be :A. `CaO`B. `KO_(2)`C. `Li_(2)O`D. `Na_(2)O_(2)`

The correct statement for the molecule, `CsI_(3)` isA. It is a covalent moleculeB. It contains `Cs^(+)` and `I_(3)^(-)` ionsC. It contains `Cs^(3+)` and `I^(-)` ionsD. It contains `Cs^(+), I^(-)` and lattice molecule

The correct statement for the molecule `csI_(3)` is .A. It contains `Cs^(3+)" and "I^(-)` ionsB. It contains `Cs^(+),I^(-)` and lattice `I_(2)`C. It is a covalent moleculeD. It contains `Cs^(+)" and I_(3)^(-)` ions

At high temperature, nitrogen combines with `CaC_(2)` to give `:`A. Calcium cyanideB. Calcium cyanamideC. Calcium carbonateD. Calcium nitride

At the occasion of marriage , the fire workds are used, which of the following gives green flame ?A. NaB. KC. BaD. Ca

Four moles of `NaNO_(3)` when heated to `800^(@)` C , totally how many moles of paramagnetic gas molecules liberated ?

Compounds of alkaline earth metals are less soluble in water than the corresponding alkali metal salts due to :A. Lower lattice energiesB. Higher ionization enthalpiesC. Higher covalent characterD. Higher ionic character

Compounds of alkaline earth metals are less soluble in water than the corresponding alkali metal salts due to :A. Theior high ionistion energyB. Their low electronegtivityC. Their low huydration energyD. Their high lattice energy

Compounds of alkaline earth metals are less soluble in water than the corresponding alkali metal salts due to :A. their high ionisation energyB. their low electronegativityC. their low hydration energyD. their high lattice energy

The order of decreasing ionisation enthalpy in alkali metals isA. `Na gt Li gt K gt Rb`B. `Rb lt Na lt K lt Li`C. `Li gt Na gt K gt Rb`D. `K lt Li lt Na lt Rb`

Metallic elements are described by their standard electrode potential , fusion enthalpy , atomic size , etc . The alkali metals are characterised by which of the following properties ?A. High boiling pointB. High negative standard electrode potentialC. High densityD. Large atomic size

Metallic elements are described by their standard electrode potential, fusion enthalpy, atomic size, etc. The alkali metals are characerised by which of the following properties?A. High boiling pointB. High negative standard electrode potentialC. High densityD. Large atomic size

Both Be and Al become passive on reaction with conc. nitric acid due to-A. The non-reactive nature of the metalB. The non-reactive nature of the acidC. The formation of an inert layer of oxide on the sueface of the metalsD. Formaation of acitive of oxide on the surface of metals.

Excess of Li and Mg are allowed to react separately with 1 mole of `N_(2)` gas, ration of gaseous product obrained in complate hydrolysis of both compounds:A. `1:2`B. `2:1`C. `1:1`D. `2:3`

Give reasons for the following : (i) `MgCl_(2)` is more covalent than NaCl (ii) CuCl is more covalent than NaCl.

Give reasons for the following : (i) `Be(OH)_(2)` dissolves in NaOH but `Mg(OH)_(2)` does not . (ii) Magnesium oxide is used as a refractors material , (iii) During electrolysis of molten sodium chlorides , calcium chloride and potassium fluoride are added .