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.
| 151. |
Which of the following statements is a yellow solid in pure water?A. `KNO_3`B. `KNO_2`C. `K_2O_2`D. `KO_2` |
| Answer» potassium, `KO_2` super oxide is a yellow solid. | |
| 152. |
Which of the following exists as polymeric chain in the solid state?A. `SrCl_2`B. `BaCl_2`C. `MgCl_2`D. `BeCl_2` |
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Answer» Correct Answer - D `BeCl_2` exists as ploymeric chains. |
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| 153. |
Which out of the following does not exist in the solid state?A. `NaHCO_3`B. `CaCO_3`C. `Ca(HCO_3)_2`D. `BaCO_3` |
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Answer» Correct Answer - C Bicarbonates of alkaline earth metals do not exist in the solid state but exist in solutions only. |
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| 154. |
Assertion: Barium is not required for normal biological function in human. Reason: Barium does not show variable oxidation state.A. Both A and R are true and R is the correct explanation of AB. Both A and R are true but R is not a correct explanation of AC. A is true but R is falseD. A is false but R is true or (E) Both A and R are false. |
| Answer» Correct Answer - A | |
| 155. |
`CaCO_3` exist inA. only one crystalline formB. only two crystalline formsC. three crystalline formsD. four crystalline forms |
| Answer» `CaCO_3` is dimorphous i.e., it exits in two crystalline forms, calcite and aragonite. Calcite is the stable form at room temperature. It is found in marble , chalk, egg shells and sea shells. Argonite is a meta stable form at room temperature. It exists in shells and coral and separates from hot lime water when `CO_2` is passed though it. | |
| 156. |
In the reaction `Mg+H_2OtoX+H_2`,X isA. MgOB. `Mg(OH)_2`C. `MgH_2`D. none of these |
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Answer» Correct Answer - A `Mg+underset(steam)H_2OtoMgO+H_2` |
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| 157. |
Superoxide of type `MO_2` are formed by all exceptA. PotassiumB. BerylliumC. StrontiumD. Barium |
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Answer» Correct Answer - B Barium ion due to large size can easily stabilise the superoxide `(O_2^(-))` ion. |
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| 158. |
A substance which gives a brick red flame and breaks down on heating to give oxygen and a brown gas isA. Magnesium nitrateB. Calcium carbonateC. calcium nitrateD. Magnesium carbonate |
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Answer» Correct Answer - C `underset("Brick red flame")Ca(NO_3)_2overset(Delta)toCaO+underset("Brown")NO_2+O_2` |
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| 159. |
Flash bulbs contain a foil of magnesium packed in the atmosphere ofA. NitrogenB. AirC. HalogensD. `SO_2` |
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Answer» Correct Answer - A Nitrogen provides inert atmosphere. |
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| 160. |
A burning magnesium ribbon will continue to burn inA. `N_2` and steamB. `CO_2` and `SO_2`C. `N_2,CO_2" and "SO_2`D. `N_2,CO_2,SO_2` and steam |
| Answer» A burning magnesium ribbon will continue to burn in `N_2`, steam, `CO_2` and `SO_2`. | |
| 161. |
Which of the following pairs of substance would give same gaseous product on reaction with water?A. Na and `Na_2O_2`B. Ca and `CaH_2`C. Ca and CaOD. Ba and `BaO_2` or (E) Ca and `CaC_2` |
| Answer» Correct Answer - B | |
| 162. |
Which of the following does not contain magnesiumA. MagnetiteB. AsbestosC. MagnesiteD. Carnallite |
| Answer» Correct Answer - A | |
| 163. |
Which of the following hydroxides is the weakest base?A. LiOHB. `Ca(OH)_2`C. KOHD. `Sr(OH)_2` |
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Answer» Correct Answer - A LiOH is weakest base because Li-OH bond is strong due to small size of lithium. |
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| 164. |
Which of the following is the weakest base:-A. `Ca(OH)_2`B. KOHC. Li(OH)D. `Sr(OH)_2` |
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Answer» Correct Answer - A (A) out of all the given choice `Ca(OH)_2` is the weakest base. Charge/ionic radius for `Ca^(2+)` and `Li^(+)` are 2/100 and 1/60 respectively. |
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| 165. |
Which one of the salts does not impart a colour to the flame or the flame test is not shown byA. LiClB. KIC. `MgCl_2`D. `CaCl_2` |
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Answer» Correct Answer - C `Be^(2+)` and `Mg^(2+)` do not impart any colour to the flame due to high Ies. |
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| 166. |
Which pair of the following chlorides does not impart color to the flame ?A. `BeCl_2" and "SrCl_2`B. `BeCl_2" and "MgCl_2`C. `CaCl_2" and "BeCl_2`D. `BeCl_2" and "SrCl_2` or (E) `MgCl_2" and "CaCl_2` |
| Answer» Correct Answer - B | |
| 167. |
Alkaline earth metal (s) which does (do) not impart colour to the flame is (are)A. BeB. MgC. CaD. Sr. |
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Answer» Correct Answer - A,B Be and Mg do not impart any colour to Bunsen flame due to their high ionisation enthalpies. |
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| 168. |
A chloride dissolves appreciably in cold water. When placed on platinum wire in Bunsen flame, no distinctive colour is noticed, the cation would beA. `Be^(2+)`B. `Be^(2+)`C. `Rb^(2+)`D. `Ca^(2+)` |
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Answer» Correct Answer - A `Be^(2+` compounds do not impart any colour to the flame. |
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| 169. |
Which salt gives crimson colour in flame?A. `SrCl_2`B. `CaCl_2`C. NaClD. `MgCl_2` |
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Answer» Correct Answer - A Sr salt give crimson red flame colour while Ca salt give brick red flame colour. |
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| 170. |
Assertion Setting of cement is an exothermic process. Reason It involves dehydration of calcium aluminates and calcium silicates.A. Both A and R are true and R is the correct explanation of AB. Both A and R are true but R is not a correct explanation of AC. A is true but R is falseD. A is false but R is true or (E) Both A and R are false. |
| Answer» Correct Answer - C | |
| 171. |
The valence shell configuration fo alkaline earth metals is represented by `ns^2` where n varies fromA. 2 to 6B. 2 to 7C. 1 to 6D. 1 to 7 |
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Answer» Correct Answer - B From two to seven (factual). |
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| 172. |
One of the following statements is incorrectA. Element of group 2 are good conductors of electricity and heatB. Compounds of group 2 elements are diamagnetic in natureC. The salts of group 2 elements are more heavily hydrated than those of elements of group 1D. Elements of group 2 are more electropositive than group 1 elements. |
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Answer» Correct Answer - D Group 2 elements due to higher ionisation energy are less electropositive than Group 1 elements. |
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| 173. |
Alkaline earth metals from dipositive ions instead of unipositive ions becauseA. Dipositive ions carry more chargeB. Their second ionisation energies are not different from first ionisation energyC. Unipositive ions do not have stable configurationD. Dipositive ion have more hydration energy. |
| Answer» Correct Answer - D | |
| 174. |
An atom with atomic number 20 is most likely to combine chemically with the atom whose atomic number isA. 11B. 14C. 16D. 10 |
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Answer» Correct Answer - C Element with atomic number 20(Ca) is a divalent electropositive metal. It will easily react with an electronegative element (sulphur with atomic number 16) |
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| 175. |
The hydride from amongest the following that cannot be obtained directly by reaction with hydrogen isA. `CaH_2`B. `MgH_2`C. `BeH_2`D. NaH |
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Answer» Correct Answer - C `BeH_2` is infact obtained by the reduction `BeCl_2` with `LiAIH_4`. |
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| 176. |
Which of the following is used as a scavenger in metallurgy?A. NaB. KC. CaD. Zn |
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Answer» Correct Answer - C Calcium is used as a scavenger (of `O_2,N_2`) in metallurgy. |
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| 177. |
A common food preservative in squashes and fruit juices isA. Sodium metabisulphiteB. sodium sulphideC. sodium sulphateD. none of these |
| Answer» Sodium meta-bisulphite is a common food preservation. It liberates `SO_2` slowly with the organic acids present in squashes and fruit juices which helps in the preservation process by killing the micro-organisms. | |
| 178. |
Which of the following has exceptionally high boiling point?A. MgOB. NaHOC. NaClD. KCl. |
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Answer» Correct Answer - A MgO has high boiling point due to small size and high charges so bond is strong. |
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| 179. |
The hydration energy of `Mg^(+2)` is greater than that ofA. `Al^(3+)`B. `Na^(+)`C. `Be^(2+)`D. `Li^+` |
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Answer» Correct Answer - B the hydration energy depends upon the size of the ion. Small ions have large hydration energies because, they can be surrounded by greater no. of water molecules due to their large positive charge densities. |
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| 180. |
In which of the following is the hydration energy higher than the lattice energy?A. `SrSO_4`B. `BaSO_4`C. `MgSO_4`D. `RaSO_4` |
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Answer» Correct Answer - C (c ) In `MgSO_4` hydration enthalpy is more than lattice enthalpy. Since only `MgSO_4` is freely soluble in water. |
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| 181. |
Which one of the following alkaline earth metal sulphates has its hydration enthalpy greater than its lattice enthalpy?A. `SrSO_4`B. `CaSO_4`C. `BeSO_4`D. `BaSO_4` |
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Answer» Correct Answer - C Among alkaline earth metals, lattice enthalpy remain almost constant but hydration enthalpy decreases down the group. Thus `BeSO_4` has ligher hydration enthalpy as compared to lattice enthalpy: `BeSO_4` is readily soluble in water. |
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| 182. |
Metallic magnesium is prepared byA. Reduction of MgO by cokeB. Electrolysis of aqueous solution of `Mg(NO_3)_2`C. Displacement of Mg by iron from `MgSO_4` solutionD. Electrolysis of molten `MgCl_2` |
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Answer» Correct Answer - D Electrolysis of molten `underset("At cathode")MgCl_2` `MgCl_2iffMg^(2+)+2Cl` `Mg^(2+)+2e^(-)toMg` |
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| 183. |
The order of increasing lattice energy of the metallic compound isA. NaClltCaOltNaIltBaOB. NaIltNaClltBaOltCaOC. NaClltNaIltBaOltCaOD. NaIltNaClltCaOltBaO |
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Answer» Correct Answer - B Lattice energy is directly proportional to charge and inversely proportional to size. |
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| 184. |
Property of the alkaline earth metals that increases with their atomic number isA. solubility of their hydroxides in waterB. solubility of their sulphates in waterC. ionisation energyD. electronegativity |
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Answer» Correct Answer - A Solubility of hydroxides of alkaline earth metals increases because both the lattice energy are hydration energy decrease down the group are the size of the cation increase but lattice energy decrease more rapidly than the hydration energy and hence the solubility increases down the group. Among sulphates, since size of `SO_4^(2-)` ion is very big as compared to the metal cation, therfore, lattice energy remains the almost constant but their hydration energy decrease downt the group of course electronegatively and ionization energy both decrease down the group as the atomic size increase. |
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| 185. |
The compounds of alkaline earth metals have the following magnetic nature:A. DiamagneticB. ParamagneticC. FerromagneticD. Antiferromagnetic |
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Answer» Correct Answer - A Compounds of alkaline earth metals are diamagnetic in nature. It is due to the absence of unpaired electrons. |
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| 186. |
Which of the following metal dissolves in sodium hydroxide with the evolution of hydrogen?A. CalciumB. MagnesiumC. BerylliumD. Strontium |
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Answer» Correct Answer - C `Be+2NaOHtoNa_2BeO_2+H_2` |
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| 187. |
Which of the following alkaline earth metal hydroxide is amphoteric in nature?A. `Be(OH)_2`B. `Ca(OH)_2`C. `Sr(OH)_2`D. `Ba(OH)_2` |
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Answer» Correct Answer - A `Be(OH)_2` is amphoteric because it reacts both with acids and bases. |
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| 188. |
Which of the following is not an ore of magnesium?A. CarnalliteB. MagnesiteC. DolomiteD. Gypsum |
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Answer» Correct Answer - D Gypsum `CaSO_4.2H_2O` is an ore of calcium. |
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| 189. |
Important ore of magnesium isA. DolomiteB. SylvineC. AmblygoniteD. Triphyllite |
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Answer» Correct Answer - A Dolomite is a mixture of `CaCO_3` and `MgCO_3`. |
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| 190. |
Which of the following on thermal decomposition yields a basic as wel as acidic oxide?A. `KClO_3`B. `CaCO_3`C. `NaNO_3`D. `NH_4NO_3` |
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Answer» Correct Answer - B `CaCO_3overset(Delta)tounderset("Basic oxide")CaO+underset("Acidic oxide")CO_2` |
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| 191. |
Which of the following on thermal decomposition yields a basic as well as an acidic oxide?A. `KCIO_3`B. `CaCO_3`C. `NH_4NO_3`D. `NaNO_2` |
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Answer» Correct Answer - B `CaCO_3overset(Delta)tounderset("basic")CaO+underset("acidic")CO_2` |
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