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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.
| 51. |
In alkaline earth metals, the electrons are more firmly held to the nucleus and henceA. atoms of alkaline earth metals are bigger than alkali metalsB. ionziations energy of alkaline earths is greater than alkali metalsC. reactivity of alkaline earths is greater than alkali metalsD. alkaline earths are less abundant in nature. |
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Answer» Correct Answer - B when the electrons are more firmly held to the nucleus, it is difficult to remove the electrons so more energy is required. |
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| 52. |
In case of alkaline earth metals. The oxidation state of more than two is not observed becauseA. they have only two electrons in the outermost shellB. the s-orbital can accommodate only two electronsC. the removal of third electron involves breaking up of noble gas configuration and the energy needed for this purpose is extermely highD. none of these |
| Answer» Correct Answer - C | |
| 53. |
On moving down the group, the reducing power of alkaline earth metals.A. decreasesB. increasesC. remain unchangedD. increases and then decreases |
| Answer» Correct Answer - B | |
| 54. |
When one mole of bleaching powder is completely decomposed, then the mass of chlorine gas that is liberated will beA. 35.45gB. 70.90gC. 17.72gD. 88.60g |
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Answer» Correct Answer - B `underset(1 mol)CaOCl_2+CO_2toCaCO_3+underset(1 mol)Cl_2` `1 mol "of" Cl_2=2xx"Gram atomic mass of Cl"` `=2xx35.45=70.90g` |
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| 55. |
In the presence of cobalt chloride `(CoCl_2)`, bleaching powder decomposes to formA. `CaCO_3" and "O_3`B. `ClO_2` and CaOC. `Cl_2O` and CaOD. `CaCl_2` and `O_2` |
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Answer» Correct Answer - D In the presence of `CoCl_2`, bleaching powder decomposes to form. `CaOCl_2overset(CoCl_2)toCaCl_2+O_2` |
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| 56. |
Setting of plaster of Paris involvesA. Oxidation with atmospheric oxygenB. Combination with atmosphere `CO_2`C. DehydrartionD. Hydration to yield another hydrate |
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Answer» Correct Answer - D `CaSO_4." "0.5H_2+1.5H_2OtoCaSO_4.2H_2O` |
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| 57. |
`MgBr_(2)` and `MgI_(2)` are soluble in acetone because ofA. their ionic natureB. their coordinate natureC. their metallic natureD. their covalent nature |
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Answer» Correct Answer - D Because of their covalent character. |
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| 58. |
`Ca^(2+)` is isoelectronic withA. `Mg^(2+)`B. KrC. ArD. `Na^+` |
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Answer» Correct Answer - C `Li^+` has stable noble gas electronic configuration. |
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| 59. |
`Ca^(2+)` ion is isoelectoronic withA. NaB. ArC. `Mg^(2+)`D. `Sr^(2+)` |
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Answer» Correct Answer - B `Ca^(+2)` and Ar both have 18 electrons. |
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| 60. |
Dow metal containsA. Mg,AlB. Al,Mg,ZnC. Mg,Cu,ZnD. Mg,Cu |
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Answer» Correct Answer - B Dow metal contains Al, Mg and Zn. |
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| 61. |
The sulphate of which metals given below has highest solubility in waterA. CaB. BaC. SrD. Mg. |
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Answer» Correct Answer - D The decreasing order of solubility is `MgSO_4gtCaSO_4gtSrSO_4gtBaSO_4` because solubility of sulphates depend on hydration energy which decreases down the group so solubility decreases. |
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| 62. |
The lesser solubility of `NaHCO_3` than `Na_2CO_3` in water is mainly due toA. higher lattice energy due to smaller size of `HCO_3^-` ionB. smaller hydration energy fo larger `HCO_3^-` ionC. intermolecular H-bondingD. intermolecular H-bonding between `NaHCO_3` molecules and water molecules of crystallisation. |
| Answer» Lesser solubility is due to extensive intermolecular H-bonding between bicarbonate ions in `NaHCO_3`. | |
| 63. |
Which of the following is best suited to dry crystals of ammine salts (complexes in which `NH_3` is a ligand e.g., `[Ni(NH_3)_6]Br_2)`A. Anhy. `CaCl_2`B. Anhy. CaOC. A mixture of CaO and `NH_4Cl`D. None of these |
| Answer» A mixture of CaO and `NH_4Cl` is used to dry crystals of complexes containing `NH_3` as ligands. The water liberated by moist crystals is absorbed by CaO. This moisture helps in the chemical reaction between CaO and `NH_4Cl` to create an atmosphere of `NH_3`which prevents the decomposition of highly unstable complexes i.e., ammine salts. | |
| 64. |
Plaster of paris isA. `Ca_2SiO_4.1//2H_2O`B. `Ca_2SiO_4.1//2"2"H_2O`C. `Ca_2SO_4.1//2H_2O`D. `CaCO_4.2H_2O` |
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Answer» Correct Answer - C Chemical composition of Plaster of Paris is `CaSO_4.1//2H_2O` |
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| 65. |
Which of the following carbonates is the most stableA. `MgCO_3`B. `CaCO_3`C. `SrCO_3`D. `BaSO_4` |
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Answer» Correct Answer - D The stability of the alkaline earth metal carbonates increases as the basic character of their hydroxides increases down the group since `Ba(OH)_2` is most basic, therefore,`BaCO_3` is most stable. |
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| 66. |
Identify the correct statement:A. Gypsum contains a lower percentage fo calcium than Plaster of ParisB. Gypsum is obtained by heating Plaster of ParisC. Plaster of Paris can be obtained by hydration of gypsumD. Plaster of Paris is obtained by partial oxidation of gypsum. |
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Answer» Correct Answer - A Gypsum, `CaSO_4.2H_2O` has a lower percentage of calcium than Plaster of Paris, `CaSO_4.1//2H_2O`. |
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| 67. |
Setting of cement is anA. Exothermic reactionB. Endothermic reactionC. Neither exothermic nor endothermicD. None |
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Answer» Correct Answer - A Setting of Plaster of Paris involves hydration to yield another hydrate. |
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| 68. |
The milk of lime isA. Suspension of `CaCO_3` in waterB. Suspension of `Ca(OH)_2` in waterC. supension of sand in waterD. suspension of `CaSO_4` in water. |
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Answer» Correct Answer - B Milk of lime is suspension of `Ca(OH)_2` in water whereas a clear solution of `Ca(OH)_2` in water is called Lime water. |
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| 69. |
`BeSO_4` is soluble in water but `BaSO_4` is insoluble becauseA. `BeSO_4` is ionic while `BaSO_4` is covalentB. `BeSO_4` is crystalline while `BaSO_4` is amorphousC. `BeSO_4` has smaller lattice energy and high heat of hydration as compared to `BaSO_4`D. `BeSO_4` is ionic while `BaSO_4` is covalent |
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Answer» Correct Answer - C Solubiltiy increases with increase in hydration energy and decrease in lattice energy. |
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| 70. |
In the reaction `Be+2NaOHtoX+H_2O`, X isA. `Be(OH)_2`B. `Na_2BeO_2`C. BeOD. None of these |
| Answer» Correct Answer - B | |
| 71. |
The nitride salt of Ca when treated with `H_2O` givesA. `N_2`B. CaOC. `CaH_2`D. `NH_3` or (E) `N_2H_4` |
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Answer» Correct Answer - D `Ca_3N_2+6H_2Oto3Ca(OH)_2+2NH_3` |
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| 72. |
Group 2 elements belong toA. f-blockB. d-blockC. s-blockD. p-block |
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Answer» Correct Answer - C Because these have `ns^2` configuration. |
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| 73. |
Which out of the following will have the large value of solubility product/most soluble in water?A. `Be(OH)_2`B. `Ca(OH)_2`C. `Ba(OH)_2`D. `Mg(OH)_2` |
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Answer» Correct Answer - C solubility of alkaline earth hydroxides increases down the group. As such `Ba(OH)_2` is most soluble in water. |
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| 74. |
Which of the following statements is true about `Ca(OH)_(2)`?A. It is not used in the preparation of bleaching powderB. It is a light blue solidC. It is used in chromatographyD. Its solution in water is called lime water |
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Answer» Correct Answer - D Solution of `Ca(OH)_2` in water is called lime water (factual). |
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| 75. |
Which of the following can dissolves limestrone?A. `CO_2+H_2O`B. `NaOH+H_2O`C. `NH_3+H_2O`D. none of these |
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Answer» Correct Answer - A `CaCO_3(s)+CO_2(g)+H_2O(l)toCa(HCO_3)_2` (aq) |
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| 76. |
Which of the following compound of cement sets at the slowest rate?A. Dicalcium silicateB. sTricalcium silicateC. Tricalcium aluminateD. Tetracalcium aluminoferrite |
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Answer» Correct Answer - A Dicalcium silicate present in cement sets at the slowest rate. |
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| 77. |
Which of the following is not the characteristic of Ba?A. It emits electrons on exposure to lightB. It is a silvery white metalC. It forms `Ba(NO_3)_2` which is used in preparation of green fireD. Its ionization potential is lower than radium |
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Answer» Correct Answer - A Alkaline earth metals have relatively high ionization energy hence they donot emit electrons on exposure to light. |
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| 78. |
The most electronegative alkaline earth metal isA. BeB. MgC. CaD. Ra. |
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Answer» Correct Answer - A The electronegativity increases when we move along a period and it decrease down a group. |
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| 79. |
The decreasing order of the second ionisation potential of K , Ca and Ba is (At. No : K = 19 , Ca = 20 , Ba = 56)A. KgtCagtBaB. CagtBagtKC. BagtKgtCaD. KgtBagtCa |
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Answer» Correct Answer - A Out of the three, K has the highest 2nd ionisation energy. Ca(higher up in the group) has a higher 2nd ioniation energy than Ba. |
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| 80. |
Which of the following is a covalent oxide?A. CaOB. SrOC. MgOD. BeO |
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Answer» Correct Answer - D BeO is a covalent oxide because Berium has small size and high polarising power. |
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| 81. |
Select one of the following sets in which there are three members of group 2A. Aluminium,sodium,potassiumB. Lithium,sodium,potassiumC. Magnesium,barium,calciumD. Rubidium,cesium,francium |
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Answer» Correct Answer - C Mg, Ba, Ca belong to group 2. |
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| 82. |
Which of the following metallic chloride has covalent character?A. Beryllium chlorideB. sodium chlorideC. Magnesium chlorideD. Barium chloride |
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Answer» Correct Answer - A Small size and high polarising power of chlorine which makes `BeCl_2` covalent. |
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| 83. |
The element with atomic no. 56 belong toA. s-blockB. p-blockC. d-blockD. f-block |
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Answer» Correct Answer - A `._(56)Ba=[Xa]^(54)6s^2` |
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| 84. |
The atomic numbers of four elements are given below. Which one is an alkaline earth metal?A. 10B. 20C. 30D. 40 |
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Answer» Correct Answer - B Element with atomic number 20(Ca) is an alkaline earth metal. |
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| 85. |
The atomic size of elements of group 2 compared to group 1 element areA. equalB. higherC. smallerD. none of these |
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Answer» Correct Answer - C Along a period atomic size decreases. So alkaline earth metals have smaller atomic size than alkali metals. |
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| 86. |
Limestone is not used in which of the following manufacturing processes?A. phosphorus from phosphoriteB. Ordinary (soda lime) glassC. Iron from haematiteD. Solvay process of sodium carbonate |
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Answer» Correct Answer - A Limestone is not used in the extraction of phosphorus from phosphorite, `Ca_3(PO_4)_2` |
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| 87. |
Bone ash containsA. CaOB. `Ca_3(PO_4)_2`C. `CaSO_4`D. `Ca(H_2PO_4)_2` |
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Answer» Correct Answer - B `Ca_3(PO_4)_2` (factual). |
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| 88. |
Which out of the following statements is not correct for anhydrous calcium chloride ?A. It is prepared by heating hydrated calcium chloride above 533KB. It is used for drying alcohol and `NH_3`C. It is used as a dehydrating agent to control snow and ice on highway and pavementsD. When mixed in concrete, it gives quicker initial setting and improves its strength |
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Answer» Correct Answer - B Ahydrous `CaCl_2` is not used to dry `NH_3` and alcohols because it combines with alcohols to form alcohol of crystallization `(CaCl_2.4C_2H_5OH)`. |
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| 89. |
Alkaline earth metals comes underA. HalogensB. Represntative elementsC. Transition elementsD. Inner transition elements |
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Answer» Correct Answer - B Alkaline earth metals belong to representative elemens. |
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| 90. |
Which of the following represent calcium chloride?A. `CaClO_2`B. `Ca(ClO_4)_2`C. `Ca(ClO_3)_2`D. `Ca(ClO_2)_2` |
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Answer» Correct Answer - D Calcium chloride is `Ca(ClO_2)_2`. [calcium : `Ca^(2+)," Chlorite: "ClO_2^-`] |
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| 91. |
The name of `CaSO_4.1/2H_2O` isA. GypsumB. Epsom saltC. Plaster of ParisD. Dolomite |
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Answer» Correct Answer - C `CaSO_4.1//2H_2O` is Plaster of Paris. |
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| 92. |
Dead burnt plaster isA. `CaSO_(4)2H_2O`B. `MgSO_(4)2H_2O`C. `CaSO_(4)1//2H_2O`D. `CaSO_4` or (E)`MgSO_4` |
| Answer» Correct Answer - D | |
| 93. |
Dead burnt plaster isA. `(CaSO_4)_2.H_2O`B. `CaSO_3`C. `CaSO_4.2H_2O`D. Anhydrous `CaSO_4` |
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Answer» Correct Answer - D Dead burnt plaster is anhydrous `CaSO_4`. |
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| 94. |
The element which is not present in asbestos, isA. CaB. BaC. MgD. Si |
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Answer» Correct Answer - B Ba is not present in Asbestos. It is `CaMg_3(SiO_3)_4` |
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| 95. |
Which of the following process is used in the extractive metallurgy of magnesium ?A. Fused salt electrolysisB. Self reductionC. Aqueous solution electrolysisD. Thermite reduction |
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Answer» Correct Answer - A Magnesium is obtained by the electrolysis of its fused anhydrous salt. |
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| 96. |
Assertion Be shows similarities with Al. Reason `Be^(2+)` and `Al^(3+)` have same ionic radii.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 - B | |
| 97. |
Calcium does not combine directly withA. OxygenB. NitrogenC. HydrogenD. Carbon |
| Answer» Correct Answer - B | |
| 98. |
Which metal does not form ionic hydride-A. BaB. SrC. CaD. Be. |
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Answer» Correct Answer - D be does not form hydrides. |
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| 99. |
which of the following configurations is correct for alkaline earth elements?A. `1s^(2)2s^(2)2p^(6)`B. `1s^(2)2s^(2)2p^(6)3s^(2)2p^(2)`C. `1s^(2)2s^(2)2p^(6)3s^(2)`D. `1s^(2)2s^(2)2p^(3)` |
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Answer» Correct Answer - C Alkaline earth metals have `ns^2` general electronic configuration. |
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| 100. |
The nature of the oxide of radium isA. AcidicB. BasicC. NeutralD. Amphoteric |
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Answer» Correct Answer - B Alkaline earth metals give Basic oxides. |
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