InterviewSolution
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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.
| 101. |
Sodium peroxide, a yellow solid, when exposed to air becomes white due to the formation ofA. `H_(2)O_(2)`B. `Na_(2)O`C. `Na_(2)O` and `O_(3)`D. NaOH and `Na_(2)CO_(3)` |
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Answer» Correct Answer - d In the presence of moisture and `CO_(2), Na_(2)O_(2)` is converted into NaOH and `Na_(2)CO_(3)` |
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| 102. |
Sodium peroxide which is a yellow solid, when exposed to air becomes white due to the formation of:A. `H_(2)O_(2)`B. `Na_(2)O`C. `Na_(2)O` & `O_(3)`D. NaOH & `Na_(2)CO_(3)` |
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Answer» Correct Answer - D |
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| 103. |
Arrange `BeCl_(2), MgCl_(2), CaCl_(2), SrCl_(2)` and `BaCl_(2)` in increasing order of (i) tendency to get hydrolysed (ii) lattice energy (iii) covalent nature |
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Answer» Correct Answer - (i) `BaCl_(2) lt SrCl_(2) lt CaCl_(2) lt MgCl_(2) lt BeCl_(2)` (ii) same order (iii) Same order |
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| 104. |
Which of the following statements is not true ?A. `K_(2)Cr_(2)O_(7)` solution in acidic medium is orangeB. `K_(2)Cr_(2)O_(7)` solution becomes yellow on increasing the `pH` beyond 7C. On passing `H_(2)S` through acidified `K_(2)Cr_(2)O_(7)` solution, a milky color is observedD. `Na_(2)Cr_(2)O_(7)` is preferred over `K_(2)Cr_(2)O_(7)` in volumetric analysis |
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Answer» Correct Answer - D `Na_(2)Cr_(2)O_(7)` is deliquescent and therefore not used as primary standard in volumenteric analysis. |
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| 105. |
The substance used in smoke screen isA. Sodium chorideB. Zinc phosphateC. Calcium phosphideD. Calcium fluride |
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Answer» Correct Answer - 3 |
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| 106. |
Ripening of fruits can be carried out in the presence ofA. `NA_(2)SO_(4)`B. NaClC. `CaCl_(2)`D. `CaC_(2)` |
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Answer» Correct Answer - 4 |
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| 107. |
Which of the following metal forms `M_(2)O_(2)` (peroxide)?A. `Li`B. `Na`C. bothD. `Be` |
| Answer» Correct Answer - B | |
| 108. |
Which of the following property of lithium and magnesium is not related to their diagonal relationship ?A. Solubility of their chlorides in ethanolB. Crystallisation of their chlorides as hydrated salts .C. Formation of colourless compoundsD. Formation of oxides and nitrides on buring in air . |
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Answer» Correct Answer - C |
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| 109. |
Which one of the alkali metals forms only the normal oxide, `M_(2)O`, on heating in air ?A. `Li`B. `Na`C. `Rb`D. `K` |
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Answer» Correct Answer - A `Li^(+)` being smallest possessses strong positive field and, thus, combines with small anion `O^(2-)` to form stable `Li_(2)O` compound. The `Na^(+),K^(+)` and `Rb^(+)` being relatively larger exert less strong positive field around them and thus react with larger oxygen anions, `i.e., O_(2)^(2-)` and `O_(2)^(1-)` to form stable oxides. |
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| 110. |
Which dispropottionates into `M_(2)O_(2)`(peroxide) and M(metal)on heating?A. `Li_(2)O`B. `Na_(2)O`C. `Na_(2)O`D. CaO |
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Answer» Correct Answer - B |
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| 111. |
Which of the following alkali metals forms only , the normal oxide , `M_(2)O` on heating in air ? (where M is the alkali metal).A. RbB. KC. LiD. Na |
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Answer» Correct Answer - C Li forms only the normal oxide , `Li_(2)O`. |
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| 112. |
Lithium and magnesium exhibit diagonal relationship becauseA. Both posses nearly the same sizeB. Both possess similar electronic configurationC. Both occur together in natureD. Both have same number of valence electrons |
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Answer» Correct Answer - A |
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| 113. |
LiF is less soluble in water than KF becauseA. LiF is more covalent than KFB. LiF has higher lattice energy than KFC. LiF has higher enthalpy of hydration than KFD. `Li^(+)` ions are not extensively hydrated as `K^(+)` |
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Answer» Correct Answer - B |
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| 114. |
Which one of the following decoposes on heating to `M_(2)O`A. LiOHB. NaOHC. KOHD. `Mg(OH)_(3)` |
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Answer» Correct Answer - A |
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| 115. |
Lif is less soluble in water than KF becauseA. LiF is more covalent than KFB. LiF has higher lattice energy than KFC. Lif has higher enthaply of hydration than KFD. `Li^(+)` ions are not extensively htdrated as `K^(+)` |
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Answer» Correct Answer - B |
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| 116. |
Which of the following fluorides are sparingly solublein water?A. LiFB. NaFC. CsFD. KF |
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Answer» Correct Answer - A |
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| 117. |
Which of the following metal ions plays an important role in muscle contraction?A. `K^(+)`B. `Na^(+)`C. `Mg^(2+)`D. `Ca^(2+)` |
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Answer» Correct Answer - D `Ca^(2+)` ions are involved in muscle contraction. |
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| 118. |
Which of the following metal ions plays an important role in muscle contraction?A. `K^(+)`B. `Na^(+)`C. `Be ^(2+)`D. `Ca^(2+)` |
| Answer» Correct Answer - D | |
| 119. |
Except lime, a major constituent of Portland cement isA. silicaB. aluminaC. iron oxideD. magnesium |
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Answer» Correct Answer - a Silica 20.25% CaO(quicklime)60-70% |
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| 120. |
White heavy precipitates are formed when `BaCl_(2)` is added to a clear solution of compound A. Precipitates are insoluble in dilute HCl. Then, the compound A is :A. A nitrateB. A bromideC. A sulphateD. A carbonate |
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Answer» Correct Answer - C X is sulphate because `BaSO_(4)` is insoluble in dilute HCI |
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| 121. |
White heavy precipitates are formed when `BaCl_(2)` is added to a clear solution of compound A. Precipitates are insoluble in dilute HCl. Then, the compound A is :A. a bicarbonateB. a carbonateC. a sulphateD. a chloride |
| Answer» Correct Answer - C | |
| 122. |
Which of the following statements is incorrect ?A. The superoxide ion `(i.e. O_(2)^(-))` is stable only in presence of larger cations such as `K^(+),Rb^(+),Cs^(+)`B. Alkali metals are normally kept in kerosene oil.C. All the alkali metal hydrides are ionic solids with high melting points.D. The concentrated solution of alkali metals in liquid ammonia is paramagnetic in nature. |
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Answer» Correct Answer - 4 `(1)` Bigger anion is stablised by bigger cation through lattice energy effect. `(2)` Because of their high reactivity towards air and water. `(3)` True statement. `(4)` In concentrated solution, unpaired electrons with opposite spins paired up `-` forming the solution diamagnetic. |
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| 123. |
Out of Be, Mg, Ca, Sr and Ba, number of elements which do not impart any colour to the flame. |
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Answer» Correct Answer - 2 |
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| 124. |
In between the metals A and B both form oxide but B also forms nitride, when both burn in air so A and B areA. `Cs,K`B. `Mg,Ca`C. `Li,Na`D. `K,Mg` |
| Answer» Correct Answer - D | |
| 125. |
Which of the following statement is not correctA. `BeF_(2)` forms complex ion with `NaF` in which Be goes with cationB. `BeCO_(3)` is kept in the atmosphere of `CO_(2)` since it is least thermally stableC. Be dissolves in alkali forming `[Be(OH)_(4)]^(-2)`D. `BeF_(2)` forms complex ion with NaF in which Be goes with anion |
| Answer» Correct Answer - A | |
| 126. |
The metal A is prepared by the electrolysis of fused chloride. It reacts with hydrogen to form a colourless solid from which hydrogen is released on treatment with water the metal isA. `AI`B. `Ca`C. `Cu`D. `Zn` |
| Answer» Correct Answer - B | |
| 127. |
In line kilns, the following reaction, `CaCO_(3)(s) hArr CaO(s)+CO_(2)(g)` proceeds to completion because ofA. of high temperatureB. `CaO` is more stable than `CaCO_(3)`C. `CO_(2)` escapes simultaneouslyD. `CaO` is not dissociated |
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Answer» Correct Answer - C `CO_(2)` escapes simultaneously. |
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| 128. |
Which of the following two ions are closer to one another in size ?A. `Li^(+)` and `Na^(+)`B. `Be^(2+)` and `Mg^(2+)`C. `Be^(2+)` and `Li^(+)`D. `Li^(+)` and `Mg^(2+)` |
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Answer» Correct Answer - D Because of diagonal relationship `,Li^(+)=76`pm and `Mg^(2+)=72` pm. |
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| 129. |
Which one of the following statements regarding the oxides of alkali and alkaline earth metals is not correct ?A. the reactivity of `K_(2)O` towards water is more than that of `Na_(2)O` towards water .B. the oxides of alkaline earth metals are more basic than those of alkali metals .C. MgO is used as a refractory material for lining electric furnaces .D. the milk of lime and lime water are two different solutions . |
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Answer» Correct Answer - B |
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| 130. |
Oxides of alkaline earth metals are stable due toA. High lattice energyB. Low IP values of alkaline earth metalsC. Low electronegativites alkaline earth metalsD. All of above |
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Answer» Correct Answer - 1 |
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| 131. |
Which one of the following statements regarding the oxides of alkali and alkaline earth metals is not correct ?A. the reactivity of `K_(2)O` towards water is more than that of `Na_(2)O` towards water.B. the oxides of alkaline earth metal are more basic than those of alkali metalsC. MgO is used as a refactory material for lining electric furnances.D. the milk of lime and lime water are two different solutions. |
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Answer» Correct Answer - B |
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| 132. |
The false statement regarding the reaction of hydrogen with alkai metals isA. Among the alkali metals the metal that react with hydrogen at higher temperature is lithium .B. All the alkali metal hydrides are ionic solidsC. The reactivity of alkali metals with hydrogen increases down the group .D. Lithium and Sodium hydrides from complex hydrides with diborane and aluminium hydride . |
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Answer» Correct Answer - C |
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| 133. |
The pair of amphoteric hydroxides isA. `Be(OH)_(2)`,` Al (OH)_(3)`B. `Al(OH)_(3)`, LiOHC. `B (OH) _(3)`, `Be(OH)_(2)`D. `Be(OH)_(2), Mg(OH)_(2)` |
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Answer» Correct Answer - A |
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| 134. |
The pair of amphoteric hydroxides isA. `Be(OH)_(2), Al(OH)_(3)`B. `Al(OH)_(3), LiOH`C. `B(OH)_(3), Be(OH)_(2)`D. `Be(OH)_(2), Mg(OH)_(2)` |
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Answer» Correct Answer - A Beryllium hydroxide and aliminium hydroxide are amphoteric in nature on account of diagonal relationship. `Be(OH)_(2)+2OH^(-)rarr [Be(OH)_(4)]^(2-)(` beryllate ion `)` `Be(OH)_(2)+2HCl+2H_(2)O rarr [Be (OH_(2))_(4)]Cl_(2)` `Al(OH)_(3)+OH^(-)rarr [Al(OH)_(4)]^(-)(` aluminate ion `)` `Al(OH)_(3)+H_(2)O+3HCl rarr [Al(OH_(2))_(4)]Cl_(3)` |
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| 135. |
The pair of amphoteric hydroxides is :A. `Be(OH)_(2)(OH)_(2)`B. `Al(OH)_(3),LiOH`C. `B(OH)_(3),(OH)_(2)`D. `Be(OH)_(2),Mg(OH)_(2)` |
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Answer» Correct Answer - 1 |
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| 136. |
`Be(OH)_(2) + 2NaOH to` |
| Answer» `Be(OH)_(2) + 2NaOH to underset("Sod.beryllate")(Na_(2)BeO_(2)) + 2H_(2)O` | |
| 137. |
`CaC_(2) + N_(2) to` |
| Answer» `underset({:("Calcium"),("carbide"):})(CaC_(2)) + N_(2) to underset({:("Calcium"),("cyanamide"):})(CaCN_(2)) + C` | |
| 138. |
Sodium carbonate is generally prepared by a process called ammonia soda process as follows : The above process cannot be used for the manufacturing of `K_(2)CO_(3)` becauseA. `KHCO_(3)` is soluble in water and doe not percipitate in carbonating waterB. `KHCO_(3)` is less soluble than `NaHCO_(3)`C. Potassium is lighter than sodiumD. Sodium reacted with water in carbonating tower |
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Answer» Correct Answer - A |
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| 139. |
Sodium carbonate is generally prepared by a process called ammonia soda process as follows : Which of the following is by-product in the above process?A. `NH_(4)Cl`B. `CaCl_(2)`C. `NH_(4)OH`D. CaO |
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Answer» Correct Answer - B |
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| 140. |
The compound D is A. `Na_(2)SO_(4)`B. `Na_(2)S_(4)O_(6)`C. `Na_(2)S_(4)O_(5)`D. `Na_(2)S_(2)O_(3)` |
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Answer» Correct Answer - D |
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| 141. |
Sodium carbonate is generally prepared by a process called ammonia soda process as follows : The above process is known asA. Ostwald processB. Solvay processC. Contact processD. None of these |
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Answer» Correct Answer - B |
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| 142. |
When `CaC_(2)` reacts with `N_(2)` a compound X is formed. X on reaction with `H_(2)SO_(4)` gives Y and `CaSO_(4)`. Then the number of `sigma` bonds in compound Y. |
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Answer» Correct Answer - 4 |
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| 143. |
`K_(2)CS_(3)` is called potassium -----------.A. thiocarbideB. thiocarbonateC. thiocyanteD. sulphocyanide |
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Answer» Correct Answer - B |
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| 144. |
From `Na_(2)O_(2)` to `Cs_(2)O_(2)` tendency to decompose decreases becauseA. Lattice energy decreasedB. Large sized anion is stablized by small sized cationC. difference between lattice enthalpipes of peroxide and oxide decreases from Na to CsD. difference between lattice enthalpies of peroxide and oxides increases from Na to Cs |
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Answer» Correct Answer - C |
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| 145. |
The complex formation tendency of alkaline earth metals decreases down the group because :A. the decrease in lattice energy is more prededomint than the secrease in hydration energyB. The decrease in lattice energy is less predominant than the decrease in hydration energyC. The salt become less ionicD. Lattice energy increasses and hydraton energy decreases aswe move from `Be^(2+) "to" Ba^(2+)` |
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Answer» Correct Answer - A |
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| 146. |
`KNO_(3)` + K(excess) `overset(Delta)(rarr) A + B uparrow` `Buparrow + Li rarr X` , then X isA. `Li_(3)N`B. `Li_(2)O`C. `LiO_(2)`D. `Li_(2)O_(2)` |
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Answer» Correct Answer - A |
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| 147. |
the product formaed whrn beryllium hydroxide is added to excess of barium hyroxide and heated to above `500^(@)C` is:A. A solid mixture of BeO and Be`(OH)_(2)`B. A solid compond of Be`(OH)_(2) and Ba (OH)_(2)`C. A solid compound BaBe`(OH)_(4)`D. A solid compound BaBe`O_(4)` |
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Answer» Correct Answer - 1 |
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| 148. |
When the same amount of zinc is treated separately with excess of sulphric acid and excess of sodium hydroxide, the ratio of volume of hydrogen evolved isA. `1:1`B. `1:2`C. `2:1`D. `2:3` |
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Answer» Correct Answer - a `Zn+H_(2)SO_(4)rarrZnSO_(4)+H_(2)uparrow` `Zn+2NaOHrarrNa_(2)ZnO_(2)+H_(2)uparrow` Hence, ratio of volumes of hydrogen evolved is 1.1. |
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| 149. |
Anhydrous barium nitrate when heated decomposes and produces `O_(2)` and `NO_(2)` gases. Similarly magnisum nitrate when heated decomposes to give out `NO_(2)` gas and oxygen. In both cases corresponding oxides are also formed. Select the correct answer(s):A. The lattic energy value is higher for magnesium nitrate than that of barium nitrateB. `NO_(2)` is evolved at a lower temperature in case of `Mg(NO_(3))_(2)` as compared to that `Ba(NO_(3))_(2)`.C. `NO_(2)` will be evolved at a lower temperature in case of `Ba(NO_(3))_(2)` as compared to that of `Mg(NO_(3))_(2)`.D. On heating `Mg(NO_(3))_(2)` and `Ba(NO_(3))_(2)`, the ratio of volume of `NO_(2)` and `O_(2)` evolved is 4:1 |
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Answer» Correct Answer - ABD |
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| 150. |
Which of the following metal is used in devising photo electric cells ?A. MgB. CaC. NaD. Cs |
| Answer» Correct Answer - D | |