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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.
| 7152. |
Calculate K_(p) for the following reaction if partial pressures of NH_(3), N_(2) and H_(2) are 0.4,0.3,0.2, atm, respectively. 2NH_(3) hArr N_(2)+3H_(2) |
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Answer» SOLUTION :`K_(p)=(p^(3)H_(2).pH_(2))/(P^(2)NH_(2))` `K_(p)=((0.2)^(3)*(0.3)("atm")^(4))/((0.4)^(2)("atm")^(2))` `K_(p)=0.015 "atm"^(2)` |
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| 7153. |
Calculate how much lime will be obtained by heating 500g of lime stone of 50% purity? [Ca=40, C=12, O=16] |
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Answer» SOLUTION :`underset(100g)(CaCO_(3 to underset(50g)(CAO)+CO_(2)` Amount of PURE `CaCO_(3)` in 500mg of impure lime stone`=(50times100)/(100)=250G` `therefore250g` of `CaCO_(3)` produces `(56times250)/(100)g=14g` of CaO |
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| 7154. |
Calculate enthalpy change for the process C Cl_(4) (g) rarr C(g) + 4Cl(g) and calculate Bond enthalpy of C-Cl bond in C Cl_(4) Given: Delta_("vap") H^(theta) = 30.5kJ mol^(-1), Delta_(f) H^(theta) (C Cl_(4)) = - 135.5 kJ mol^(-1), Delta_(a) H^(theta)(C ) = 715kJ mol^(-1) and Delta_(a) H^(theta) (Cl_(2)) = 242 kJ mol^(-1) |
| Answer» SOLUTION :`326 KJ MOL^(-1)` | |
| 7155. |
Calculate electronegativity difference between NaCl. |
| Answer» SOLUTION :NA = 0.9, CL = 3, DIFFERENCE= 2.1. | |
| 7156. |
Calculate Delta_(r ) H^(0) for the following reaction at 25^(@)C: Fe_(3) O_(4) (s) + CO(g) rarr 3FeO(s) + CO_(2) (g) DeltaH_(f)^(@) (kJ//mol) - 1118 " " -110.5 " " -272 " " -393.5 |
| Answer» ANSWER :C | |
| 7157. |
Write balanced equations for the reactions of : (i) Aluminium when heated in air. Write the name of the product. (ii) Iron with steam. Name the product obtained. (iii) Calcium with water. Why does calcium start floating in water ? |
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Answer» Solution :`Ca+2H_(2)OtoCa(OH)_(2)+H_(2)` The BUBBLES of hydrogen stick to the surface of METAL, that is why it FLOATS. |
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| 7159. |
Calcium phosphate is present in tooth enamel. Its nature is |
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Answer» basic |
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| 7160. |
Calcium phosphate can be obtained by reacting calcium hydroxide with |
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Answer» PHOSPHORIC acid |
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| 7161. |
Calcium oxide reacts with water to produce ………….and the reaction is………….. |
| Answer» SOLUTION :SLAKED LIME,EXOTHERMIC | |
| 7162. |
Calcium, magnesium and strontium have been put together in the same group of Periodic Table on the basis of their similar chemical properties. (i) Mention those properties. (Any two) (ii) Out of the three elements, which one will have atoms of biggest size and why ? (iii) Which is the first member of this group ? |
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Answer» SOLUTION :(i) (a) They show metallic PROPERTIES. (b) Their oxides are BASIC in nature. (ii) STRONTIUM has atoms of biggest size. As we move down in the group, atomic size increases. (iii) Beryllium (Be). |
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| 7163. |
Calcium is an element with atomic number 20. Stating reason for each of the following questions : (i) Is calcium a metal or non-metal ? (ii) Will its atomic radius be larger or smaller than that of potassium with atomic number 19 ? (iii) Write the formula of its oxide. |
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Answer» SOLUTION :(i) It is a metal. Because, it has TWO electrons in its outermost shell/two valence electrons, which it can LOSE easily. (ii) K (19) is placed before Ca (20) in the same period/fourth period. Since the atomic radius decreases along a period, the atomic radius of calcium is smaller than that of potassium. (iii) The formula of oxide of calcium is Cao, because the valency of calcium as well as that of oxygen is 2. |
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| 7164. |
Calcium is an element with atomic number 20. Stating reason answer each of the following questions: (i) Is calcium a metal or non-metal ? (ii) Will its atomic radius be larger or smaller than that of potassium with atomic number 19 ? (iii) Write the formula of its oxide. |
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Answer» Solution :(i) CALCIUM is a metal. The oxide of calcium `viz`., `CaO` is a basic oxide because it dissolves in water to give a base alkali). `2Ca +O_(2) to 2 CaO` `CaO + H_(2) O tounderset("Calcium hydroxide")( Ca (OH)_(2))` (ii) Atomic RADIUS of Ca is smaller than that of K. This is because, the next electron enters the same orbit as that of the last electron of K. Electronic configuration of K : 2, 8, 8, 1 Electronic configuration of Ca : 2, 8, 8, 2 And because of the increased nuclear CHARGE, the electrons in the last orbit are attracted with a greater FORCE resulting in the decrease of atomic radius. (iii) CaO is the formula of oxide of calcium. |
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| 7165. |
Calcium is an element with atomic number 20. Stating reason answer each of the following questions:(i) Is calcium a metal or non-metal? (ii) Will its atomic radius be larger or smaller than that of potassium with atomic number 19? (iii) Write the formula of its oxide. |
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Answer» Solution : (i) CALCIUM is a metal SINCE it has two electrons in its outermost shell which it can lose easily. (ii) K(19) is placed before Ca(20) in the same period (fourth period). Since the atomic radiusdecreases along a period, the atomic radius of calcium is smaller than that of POTASSIUM. (iii) The formula of oxide of calcium is CaO, because the valency of calcium as well as that OFOXYGEN is 2. |
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| 7166. |
Calciumhydroxidereactsslowlywithcarbondioxidein airto forma thinlayerof ______. |
| Answer» SOLUTION :CALCIUMCARBONATE | |
| 7168. |
Calcium hydroxide is also known as |
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Answer» LIMESTONE |
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| 7169. |
Calciumcarbonateis decomposedonheatingin thefollowingreaction CaCO_(3)toCaO+CO_2 Howmanymolesof Calciumcarbonateare involvedin thisreaction ? |
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Answer» SOLUTION :`CaCO_(3) toCaO +CO_2` No . Of MOLESOF `CaCO_(3) ` INVOLVED in thisreaction =1 |
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| 7170. |
Calciumcarbonateis decpmposedonheatingin thefollowingreaction CaCO_(3)toCaO+CO_2 Howmanymolesof CO_2are thereinthis equation ? |
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Answer» SOLUTION :`CaCO_(3) toCaO +CO_2` No. Of MOLESOF `CO_2` in thereaction = 1 |
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| 7171. |
Calcium carbonate is decomposed on heating in the following reaction CaCO_(3)rarrCaO+CO_(2) i. How many moles of Calcium carbonate are involved in this reaction? ii.Calculate the gram molecular mass of calcium carbonate involved in this reaction. iii. How many moles of CO_(2) are there in this reaction? |
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Answer» Solution :`CaCO_(3)rarr CaO+CO_(2)` i. 1mole of `CaCO_(3)` is INVOLVED in this reaction. ii. Gram molecular mass of calcium carbonate `CaCO_(3)=(40+12+3xx16)=52+48` `=100G` III. 1 mole of `CO_(2)` is in this equation. |
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| 7173. |
Calcination is employed to concentrate which ore? |
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Answer» Sulphide |
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| 7174. |
Calassify the followingelements as metals, nonmetals or metalloids, (a) Sn (b) Br, (c) Mo , (d) Cd,( e) Si and (f) Xe. |
| Answer» Solution :(a) METAL (b) nometal, (C) metal, (d) metal, (e ) metalloid (f) NONMETAL. | |
| 7175. |
Cake does not taste bitter due to presence of |
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Answer» SODIUM carbonate |
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| 7176. |
CaCO_3 + 2HCl to CaCl_2 + H_2O + CO_2 The mass of calcium chloride formed when 2.5 g calcium carbonate are dissolved in excess of hydrochloric acid is |
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Answer» 1.39g `100G CaCO_3 ` GIVEN 111g `CaCl_2` `THEREFORE 2.5g CaCO_3` given`111/100 XX 2.5` ` = 2.78 G CaCl_2` |
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| 7177. |
CaCO_3 + 2HCl to CaCl_2 + H_2O + CO_2 The volume of CO_2 gas formed when 2.5 g calcium carbonate are dissolved in excess hydrochloric acid at 0^@C and 1 atm pressure is [1 mole of any gas at 0^@Cand 1 atm pressure occupies 22.4141 volume] |
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Answer» 1.12L `2.5g CaCO_3` will liberate `44/100 xx 2.5g ` of `CO_2` 1 mole of `CO_2 = 44g` no. of moles of `CO_2` = mass of `CO_2`/molar mass of `CO_2`` = ((44 xx 2.5)/(100) )/(44)` ` = (2.5)/(100) = 0.025` moles 1 mole of `CO_2`occupies 22.4L ` THEREFORE ` 0.025 moles of `CO_2` will OCCUPY `22.4 xx 0.025 = 0.56 L` |
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| 7178. |
Ca^(2+) has a smaller ionic radius than K^(oplus) because it has "………" . |
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Answer» |
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| 7179. |
Ca : Alkaline earth metal :: Cs : _____________ |
| Answer» Solution :ALKALI metal - Cs has one electron in its outermostshell and CA has 2 ELECTRONS in its OUTERMOST shell. | |
| 7180. |
C_3H_6, C_4H_8 and C_5H_10belong to the same homologous series . a] Why is the melting point of CH higher than C,H,? b] Arrange these hydrocarbons in order of their increasing boiling point |
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Answer» SOLUTION :a] `C_5H_10` has a higher MOLECULAR MASS than `C_4H_8`. B] `C_3H_6 < C_4H_8 < C_5 H_10`. |
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| 7182. |
C_(2)H_(5)OH+3O_(2)rarr2CO_(2)+3H_(2)O is a………………. |
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Answer» Reductionof ethanol |
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| 7183. |
C+O_(2)to |
| Answer» Solution :`underset("Carbon")( C )+underset("Oxygen")(O_(2))tounderset("DIOXIDE")underset("Carbon")(CO_(2))+" Heat and LIGHT"` | |
| 7185. |
By which reaction metal is obtained from metal oxide |
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Answer» Liquification |
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| 7188. |
By which formula the maximum number of electrons that can be accommodated in a shell determines ? |
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Answer» |
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| 7189. |
By which force the anions and cations are held together in ionic compounds ? |
| Answer» SOLUTION : ELECTROSTATIC ATTRACTION FORCES | |
| 7190. |
By what type of reaction could a compound containing C, H and Cl – be obtained from ethyne? |
| Answer» SOLUTION :ADDITION of `Cl_2` | |
| 7191. |
By what names the elements of group I are known in the modern periodic table ? |
| Answer» SOLUTION :ALKALI METALS | |
| 7192. |
By constructing Khadin check-dams in level terrains. |
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Answer» underground WATER LEVEL decreses |
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| 7193. |
By constructing Khadin check - dams in level terrains. |
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Answer» UNDERGROUND WATER level increases |
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| 7194. |
By considering their position in the Periodic Table, which one of the following elements would you expect to have maximum metallic characteristic ? Ga, Ge, As, Se, Be |
| Answer» Solution :Metallic character of an ELEMENT increases down a group and DECREASES from left to right in a PERIOD. On this BASIS Be is expected to have maximum metallic character. | |
| 7195. |
By considering their position in the periodic table, which one of the following elements would you expect to have maximum metallic characteristics ? Ga Ge As Se Be |
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Answer»
Arrangement of given elements in different GROUPS and PERIODS is as follows: 
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| 7196. |
By considering their position in the Periodic Table, which one of the following elements would you expect to have maximum metallic characteristic: Ga, Ge, As, Se, and Be? |
| Answer» SOLUTION :SINCE Be lies to the extreme left hand SIDE of the PERIODICTABLE, Be is the most metallic among the GIVEN elements. | |
| 7197. |
By considering their position in the Periodic Table, which one of the following elements would you expect to have maximum metallic characteristic?GaGeAsSeBe |
| Answer» Solution : MAXIMUM metallic characteristic is FOUND in elements on the EXTREME left side of the Periodic Table.Out of the above given elements, beryllium (Be) will have the maximum metallic characteristic because it is on the extreme left side in the Periodic Table (group 2). | |
| 7198. |
By considering their position in the Periodic Table, which one of the following elements would you expect to have maximum metallic charactcristics? |
| Answer» Solution :Since Beryllium (Be) LIES to the extreme left HAND side of the PERIODIC table, Be is the most metallic AMONG the given ELEMENTS | |
| 7199. |
By adding gypsum to cement |
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Answer» SETTING TIME of cement becomes less |
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| 7200. |
Butanone is a four carbon compound with the functional group… |
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Answer» CARBOXYLIC acid. |
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