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. |
A metal `X` on heating in nitrogen gas gives `Y,Y` on treatment with `H_(2)O` gives a colourless gas which when passed through `CuSO_(4)` solution gives a blue colour. `Y` is:A. `Mg(NO_3)_2`B. `Mg_3N_2`C. `NH_3`D. MgO |
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Answer» Correct Answer - B `underset((X))3Mg+N_2tounderset((Y))Mg_3N_2` `Mg_3N_2+6H_2Oto3Mg(OH)_2+2NH_3` `MH_3(g)+CuSO_4(aq)tounderset("Deep blue complex")[Cu(NH_3)_4]SO_4(aq)` |
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| 102. |
Which of the following carbonates will not decompose on heating?A. `MgCO_3`B. `NaCO_3`C. `K_2CO_3`D. All |
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Answer» Correct Answer - A Group 2 carbonates (expcept `BeCO_3`) decomphose on heating. Carbonates of group 1 (except `Li_2CO_3`) do not decompose on heating. `MgCO_3overset(Delta)toMgO+CO_2uparrow` |
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| 103. |
which among the following does not at all show the tendency to form peroxides?A. LithiumB. MagnesiumC. BerylliumD. Barium |
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Answer» Correct Answer - A Lithium forms monoxide only. |
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| 104. |
Which out of the following is extensively used as a refractory and in domestic heating appliances?A. BaOB. CaOC. MgOD. `Na_2O` |
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Answer» Correct Answer - C Due to its high melting point. |
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| 105. |
Which of the following compounds has the lowest melting point ?A. `CaF_2`B. `CaCl_2`C. `CaBr_2`D. `CaI_2` |
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Answer» Correct Answer - D As the size of the halogen increases from F to I, Covalent character increases from `CaF_2` to `CaI_2` and melting point decrease. So `CaI_2` has the lowest melting point. |
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| 106. |
The formula of calcium cyanamide isA. `Ca(CN)_2`B. `CaC_2N`C. CaNCND. `CaCHNH_2` |
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Answer» Correct Answer - C Calcium cyanamide is `CaCN_2" or "CaNCN` |
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| 107. |
Plaster of Paris is usedA. as a plaster for wallsB. in densitry and surgeryC. in metallurgical processD. as a drying agent |
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Answer» Correct Answer - B Plaster of Paris is used in dentistry and surgery. |
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| 108. |
Which of the following on heating at `125^(@)`C gives Plaster of Paris?A. BoraxB. GypsumC. AlumD. Calomel |
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Answer» Correct Answer - B Gypsum `(CaSO_4.2H_2O)` on heating at `125^(@)`C gives Plaster of Paris. `CaSO_4.2H_2Ooverset(Delta//125^(@)C)toCaSO_4.1/2H_2O+1(1)/(2)H_2Odownarrow` |
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| 109. |
Plaster of paris is hydrate ofA. `BaSO_4`B. `CaSO_4`C. `MgSO_4`D. `ZnSO_4` |
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Answer» Correct Answer - B Plaster of Paris is a hemihydrate of `CaSO_4.(ASO_4.1/2H_2O`). |
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| 110. |
Formula of plaster of Paris isA. `CaSO_4.2H_2O`B. `CaSO_4`C. `CaSO_4.1//2H_2O`D. `CaSO_4.H_2O` or (E) `CaSO_4.MgSO_4` |
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Answer» Correct Answer - C Plaster of Paris is `CaSO_4.1//2H_2O`. |
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| 111. |
Hydrolith when dissolved in water liberates hydrogen. The formula of hydrolith isA. NaHB. `CH_4`C. `C_2H_6`D. `CaH_2` |
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Answer» Correct Answer - D `underset(Hydrolith)CaH_2+2HOHtoCA(OH)_2+2H_2` |
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| 112. |
When zeolite, which is hydrated sodium aluminium silicate, is treated with hard water, the sodium ions are exchanged withA. `H^+` ionsB. `Ca^(2+)` ionsC. `SO_4^(2-)` ionsD. `Mg^(2+)` ions or (e) `OH^-` ions |
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Answer» Correct Answer - B,D Zeolite (hydrated aluminium silicate) exchanges `Na^+` ions with the `Ca^(2+)` and `Mg^(2+)` ions present in hard water. |
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| 113. |
When hydrated `MgCI_(2).6H_(2)O` is strongly heated,A. MgO is formedB. `Mg(OH)_2` is formedC. Mg(OH)Cl is formedD. Anhydrous `MgCl_2` is formed |
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Answer» Correct Answer - B `MgCl_2.6H_2OtoMg(OH)_2+2HCl+4H_2O` |
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| 114. |
Pure anhydrous `MgCl_(2)` can be prepared from the hydrated salt byA. heating the hydrate to red heat in the atmosphere of HCl gasB. melting the hydrateC. heating the hydrate with cokeD. heating the hydrate with Mg ribbon. |
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Answer» Correct Answer - A By heating the hydrate to red heat in the atmosphere of HCl gas. On simple heating, hydrolysis takes place. Hence, to prevent hydrolysis, dry HCl gas is used. |
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| 115. |
Hydrated cloride of the alkaline earth metal. Which cannot be dehydrated on heating isA. `Ba^(2+)`B. `Be^(2+)`C. `Ca^(2+)`D. `Sr^(2+)` |
| Answer» Hydrated chlorides of `Ba^(2+),Ca^(2+)" or "Sr^(2+)` can be dehydrated by heating. | |
| 116. |
A sudden large jump between the values of second and third ionisation energies of an element would be associated with the electronic configurationA. `1S^(2)2s^(2)2p^(6)3s^(1)`B. `1S^(2)2s^(2)2p^(6)3s^(2)3p^(1)`C. `1S^(2)2s^(2)2p^(6)3s^(2)3p^(2)`D. `1S^(2)2s^(2)2p^(6)3s^(2)` |
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Answer» Correct Answer - D A sudden large jump between the values of second and third ioniation energies of an element woluld be associated with elements of group 2 or alkaline earth metals with valence shell electronic configuration of `ns^2` |
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| 117. |
which one of the following statement is correct for alkaline earth metal?A. They are diatomic and form ions of the type `M^+`B. They are highly electronegative elementsC. They are monoatomic and form ions of the type `M^2`D. Thy are diatomic and form ions of the type `M^(2+)` |
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Answer» Correct Answer - C Alkaline earth metals are monatomic and forms `M^(2+)` ions. |
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| 118. |
Bleaching powder is a compound having a formulaA. `CaCO_3`B. CaClOC. `CaOCl_2`D. `CaOCl_3` |
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Answer» Correct Answer - C Bleaching powder has the formula `CaOCl_2` |
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| 119. |
Plaster of Paris hardens byA. Giving off `CO_2`B. changing into `CaCO_3`C. combining with waterD. Giving out water |
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Answer» Correct Answer - C Plaster of Paris is hardened by combining with water. |
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| 120. |
The compound insoluble in acetic acid isA. Calcium oxideB. Calcium carbonateC. Calcium oxalateD. Calcium hydroxide |
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Answer» Correct Answer - C Calcium oxalate is insoluble in acetic acid. |
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| 121. |
Which of the following carbonates will not decompose on heating?A. `CaCO_3`B. `Na_2CO_3`C. `BaCO_3`D. `Li_2CO_3` |
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Answer» Correct Answer - B Large sized `Na^+` ion make the `CO_3^(2-)` lattice more stable so it does not decompose on heating. |
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| 122. |
(iii) Which is not a basic flux ?A. `CaCO_3`B. MgOC. CaOD. `SiO_2` |
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Answer» Correct Answer - A `SiO_2` is an acidic flux. |
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| 123. |
Among the following oxides, the one which is most basic isA. Zinc oxideB. Magnesium oxideC. Aluminium oxideD. Nitrogen pentoxide |
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Answer» Correct Answer - B Out of the given four oxides MgO is most basic. Nitrogen Pentoxide ,`N_2O_5` is acidic in nature. |
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| 124. |
Peroxide and super oxides of alkali metal are coloured because ofA. Defects in crystalsB. Presence of unpaired electronsC. Partially due to the defects and partially due to presence of unpaired electronsD. none of the above |
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Answer» Correct Answer - CA It is due to (i) presence of defects and (ii) due to the presence of unpaired electrons. |
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| 125. |
Which out of the following metal oxides is the most acidic?A. CaOB. MgOC. `Al_2O_3`D. `Na_2O` |
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Answer» Correct Answer - C All others are basic. |
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| 126. |
Ethyl alcohol can be dried withA. `CaCl_2`B. CaC. NaD. none of these |
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Answer» Ethyl alcohol can be dried with `CaCl_2` or Na as these react with alcohol. `4C_2H_5OH+CaCl_2to[Ca(C_2H_5OH)_4]Cl_2` `2Na+2C_2H_5OHto2C_2H_5ONa+H_2` |
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| 127. |
BeO is least soluble inA. pure waterB. aqueous solution of `BeCl_2`C. dilute HClD. dilute NaOH solution |
| Answer» BeO does not dissolve in water. BeO readily dissolves in an aqueous solution of `BeCl_2` (in this behaviour Be and Mg are similar-a solution of MgO in `MeCl_2` is Sorels cement). BeO reacts with dil. HCl to give `BeCl_2` and with NaOH gives sodium beryllite. | |
| 128. |
`BeCl_2` is not soluble inA. acetoneB. waterC. etherD. carbon tetrachloride |
| Answer» `BeCl_2` is soluble in water and electron donor organic solvents like acetone, ether,alcohol etc. It is insoluble in carbon tetrachloride. | |
| 129. |
Setting of cement is anA. expansionB. contractionC. evolution of heatD. absorption of heat |
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Answer» Correct Answer - A,C Setting of cement is an exothermic process, it also involves an increase in volume. |
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| 130. |
Among the following compounds of cement which is present in the highest amountA. `Ca_2SiO_4`B. `Ca_2SiO_5`C. `Al_2O_3`D. `Ca_3Al_2O_4` |
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Answer» Correct Answer - B `CaSiO_5` (51%) |
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| 131. |
The metal with highest specific heat isA. BeB. AlC. AgD. Au |
| Answer» Out of the given four metals, Be has highest specific heat (metal with lowest atomic mass will have highest specific heat). | |
| 132. |
which of the following elements has the highest value of second ionization energy?A. LithiumB. BerylliumC. BoronD. Magnesium |
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Answer» Correct Answer - A It based on both the insolubility of `BaSO_4` in water and great scattering of X-rays by `Ba^(2+)` ions. |
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| 133. |
Magnesium wire burns in the atomosphere of `CO_(2)` becauseA. Magnesium acts as an oxidising agentB. Magnesium has 2 electrons in the outermost orbitC. Magnesium acts as a reducing agent and removes oxygen from `CO_2`D. Mg forms complex with `CO_2` |
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Answer» Correct Answer - C `2Mg+CO_2to2MgO+C` |
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| 134. |
Calcium metal is used to produce high vaccum because itA. can remove waterB. can remove both `O_2` and `N_2`C. is a good reductantD. is highly electropositive |
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Answer» Correct Answer - B Calcium metal reacts with both oxygen and nitrogen and removes them. |
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| 135. |
Which is used in the laboratory for last drying of neutral gases?A. Phosphorus pentoxideB. Active charcoalC. Anhydrous calcium chlorideD. `Na_3PO_4` |
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Answer» Correct Answer - C Anhydrous `CaCl_2` is used for fast drying neutral gases in laboratory. |
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| 136. |
Carnallite on electrolysis givesA. Ca and `Cl_2`B. Na and `CO_2`C. Al and `Cl_2`D. Mg and `Cl_2` or (E) K and `CO_2` |
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Answer» Correct Answer - D Mg and `Cl_2` are obtained on electrolysis of carnallite. |
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| 137. |
The solubilities of carbonates decreases down the magnesium group due to a decrease inA. entropy of solution formationB. lattice energies of solidsC. hydration energies of cationD. Inter ionic attraction |
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Answer» Correct Answer - C The solubilities of carbonates decreases down the magnesium group due to decrease in hydration energies of cations. |
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| 138. |
The approximate percentage of gypsum in Portland cement isA. 10-15%B. 20-30%C. 30-40%D. 2-3% |
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Answer» Correct Answer - D Portland cement contains 2-3% gypsum. |
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| 139. |
Which is manufactured by electrolysis of fused NaCl?A. NaOHB. KC. CaD. Zn |
| Answer» Sodium manufactured by electrolysis of fused NaCl. | |
| 140. |
Of the following the commonly used as a laboratory desiccator isA. Anhyd. `Na_2CO_3`B. Anhyd. `CaCl_2`C. Dry NaClD. none of the above |
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Answer» Correct Answer - B Anhydrous fused `CaCl_2` is commonly used as a desiccant in laboratory desiccator. |
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| 141. |
Portland cement is manufactured by using-A. Limestone, clay and sandB. Limestone, gypsum and sandC. Limestone, gypsum and aluminaD. Limestone, clay and gypsum |
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Answer» Correct Answer - D Portland cement is manufactured by using limestone, clay and gypsum. |
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| 142. |
The metal that is extracted from sea water isA. FeB. CaC. MgD. Au |
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Answer» Correct Answer - C Sea water contains Magnesium as Magnesium chloride. Magnesium content in sea water is about 0.013%. From sea water, extraction is done by Dow process. |
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| 143. |
A certain metal is present in the soil, plants, bones, egg shelts, sea shells and coral. It is also used to remove oxygen from molten steel and its hydroxide is used to detect `Co_2`. The metal isA. MgB. AlC. CaD. Na |
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Answer» Correct Answer - C Calcium is present in soil, plants, bones, egg, shell, sea shell, coral etc. It is used to remove `O_2` from molten steel. `Ca(OH)_2` as lime water is used to detect `CO_2`. |
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| 144. |
Nitrolim isA. `Ca_3(PO_4)_2`B. `CaCN_2+C`C. `Ca(CN)_2`D. `Ca(NO_3)_2` |
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Answer» Correct Answer - B `CaCN_2+C` is called nitrolim and is used to prepare ammonia gas. |
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| 145. |
Which of the following is used for taking the `X-`ray spectra of the digestive system:A. `CaSO_4`B. `BaSO_4`C. `MgSO_4`D. `BaCO_3` |
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Answer» Correct Answer - B `BaSO_4` is safely used because it is insoluble and is opaque to the X-rays. |
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| 146. |
One among the following carbonate is soluble in waterA. `SrCO_3`B. `BaCO_3`C. `Al_2(CO_3)_3`D. `Rb_2CO_3` |
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Answer» Correct Answer - D `Rb_2CO_3` is soluble in water and the solubility of Alkali metal carbonates increases down the group. |
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| 147. |
Metals belonging to the same group in the periodic table areA. Magnesium and sodiumB. magnesium and copperC. magnesium and bariumD. magnesium and potassium |
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Answer» Correct Answer - C Mg and Ba belong to the same group (group 2) of the periodic table. |
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| 148. |
Which of the following exists in polymeric formA. `AlCl_3`B. `BeCl_2`C. SiCD. `B_2H_4` |
| Answer» Correct Answer - B | |
| 149. |
The yellow light used for street and road illumination is fromA. mercury vapour lampB. NaC. NaClOD. `NaClO_3` |
| Answer» Yellow light for illumination is from sodium vapour lamp. | |
| 150. |
The behavior of Be salt in pure water isA. BasicB. AcidicC. AmphotericD. Sometimes basic and sometimes acidic depending upon its concentration. |
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Answer» Correct Answer - C Amphoteric. |
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