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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.
| 23153. |
What is meant by an elementary reaction ? |
| Answer» SOLUTION :A REACTION which takes PLACE in one step is called an elementary reaction. For example, reaction between `H_(2)` and `I_(2)` to from 2 HI is an elementary reaction. DIFFERENT steps of a complex reaction are also elementary reactions. | |
| 23154. |
When one mole of F atoms are ionised to F^(-) , the energy released is X Joules. Then :- |
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Answer» X Joules is sufficient to ionise 1 MOLE of gaseous Cl into `Cl^(+)` |
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| 23155. |
Which of the following substances on heating will give a white sublimate ? |
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Answer» `NH_(4)Cl` |
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| 23156. |
What is the ratio of Al, Cu and Na when 3F current is pass through different electrolytic solution of molten Al_(2)O_(3),, aqueous CuSO_(4) and molten NaCl ? |
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Answer» `3:4:6` |
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| 23157. |
Why are Grignard soluble in ether but not in benzene? |
| Answer» SOLUTION :Grignard reagents form COORDINATION COMPLEXES with ether but not with benzene since the former has lone PAIR of electrons but the latter does not. | |
| 23158. |
Urea is not used : |
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Answer» As fertilizer |
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| 23159. |
The standard reduction potentials of the elements A,B and C are +2.73 V, -1.85 V ande -1.36 V respectively. The order of their reducing power is |
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Answer» `B GT C gt A` |
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| 23160. |
The reagent required to convert ethene to 2- chloroethanol is : |
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Answer» HCl |
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| 23161. |
What isthe orderfor thefollowingreactions? (a)2NO_(2(g))+ F_(2(g))to 2NO_(2) F_((g)) rate= k[NO_(2)][F_(2)] (b)CHC1_(3(g))+ C1_(2(g))to CC1_(4(g)) + HC1_((g)) rate = k [ CHC1_(3)][C1_(2)]^((1)/(2)) |
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Answer» SOLUTION :(a)ORDEROF THEREACTION=2 (B) Theorderof thereaction`=(3)/(2)` |
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| 23162. |
underset(2./_\) overset(1. HNO_(2))toP The P is |
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Answer»
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| 23163. |
Thermodynamically the most stable form of carbon is |
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Answer» DIAMOND |
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| 23164. |
Which of the following will give brick red ppt. with Fehling's solution? |
| Answer» SOLUTION :`{:(HCHO),(|),(HCOOH),(|),("Glucose GIVES positive test with Fehling.s solution"),(|),("Fructose"):}`gives positive test with Fehling.s solution. | |
| 23165. |
Which type of molecules form micelles? |
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Answer» Non polar molecules |
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| 23166. |
Which of the following ketone reduces Tollen's reagent in basic medium? |
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Answer» `CH_3 COCH_3` |
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| 23167. |
Which of the following choices match(es) with the real gas with very large molar volume? |
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Answer» `Zne1` |
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| 23168. |
Which of the following statements is/are incorrect?(a) Cassiterite is not the ore of tin (b) Metallurgy is a process of mixing of ore (c) concentration of chromite (FeO.Cr_2O_3) is done by magnetic separation (d) ZnS with depressant NaCN forms Na_2[Zn(CN)_4] |
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Answer» (a) & (B) |
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| 23169. |
Which of the following is not a salt |
| Answer» Answer :A | |
| 23170. |
What is ammonolysis? |
| Answer» Solution :The reaction of alkyl halides with ammonia (or amines) to FORM MIXTURE of `1^(@),2^(@),3^(@)` amines and quaternary SALTS is called AMMONLYSIS. | |
| 23171. |
Wash is : |
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Answer» `95.5%` alcohol |
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| 23172. |
The vapour pressure of benzene at 90^@C is 1020 torr. A solution of 5 g of a solute in 58.5 g benzene has vapour pressure 990 torr. The molecular weight of the solute is: |
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Answer» 78.2 |
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| 23174. |
Which of the following is the correct sequence of relative acidic strength ? |
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Answer» `FCH_(2)COOHgtClCH_(2)COOHgtBrCH_(2)COOH` |
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| 23175. |
Which of the following are not thermosetting polymers? |
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Answer» Bakelite |
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| 23176. |
Which of the following are isomers ? |
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Answer» METHYL alcohol and DIMETHYL ether |
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| 23177. |
Which of the following is/are soluble in ethanol |
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Answer» `HgF_(2)` |
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| 23178. |
The substance constituting more than 80% of cell contents is : |
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Answer» Protein |
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| 23179. |
When 2 gm A gas is introduced into an evacuated flask kept at 25^(@)C, the pressure is found to be 1 atm. If 3 g of another gas B is then added to same flask, the total pressure becomes 0.5 atm. The ratio of molecular weights is |
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Answer» `1:1` |
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| 23180. |
Which is the correct order of decreasing boiling point of azeotropic mixtures X-H_(2)O? |
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Answer» `HI GT HBr gt HF gt HCL` |
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| 23181. |
When a radioactive element emits an alpha particle, the daughter element is placed in the periodic table |
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Answer» TWO positions to the left of the parent element |
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| 23182. |
The vapour pressure 2.1%of an aqueous solution of a non volatile solute at 373 K is 755 mm Hg. Calculate the molar mass of the solute. |
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Answer» `P_(A)^(@)=760" MM hg, "P_(S)=755" mm Hg "` `x_(B)=(P_(A)^(@)-P_(S))/P_(S)=(760" mm Hg "-755" mm Hg ")/(755mmhg)=0.0066` A 2.1% awueous solution means 2.1 g of SOLUTE in 100 g of solution `therefore "Mass of SOLVENT "=100 g-2.1g=97.9g ` `therefore "Mass of solvent" =100G 2.1 g-2.1 g =97.9 g` `"Moles of solvent "n_(A)=(97.9g)/(18" g mol"^(-1))=5.439 g` `x_(B)=n_(B)/(n_(A)+n_(B))" or "1/x_(B)=(n_(A)+n_(B))/n_(B)=n_(A)/n_(B)+1` `n_(A)/n_(B)+1/x_(B)-1=1/(0.0066)-1=151.5-1=150.5` `n_(B)=n_(A)/(150.5)=((5.349mol))/(150.5)=0.036 mol.` `"MOLAR mass of folute"=("Mass of solute")/("Moles of solute")=((2.1g))/(("0.036mol"))=58.3" g mol"^(-1)` |
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| 23183. |
Which of the following electrolytic solutions has the least specific conductance ? |
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Answer» `0.02 N ` |
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| 23184. |
Which is not truonic, case of transition metals : |
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Answer» They are mallcable and ductile |
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| 23185. |
Write the isomers of the compound having formula C_(4)H_(9)Br. |
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Answer» Solution :The possible isomers of `C_(4)H_(9)BR` are : (i) `CH_(3)-CH_(2)-CH_(2)-CH_(2)-Br` (II)`CH_(3)-underset("Br ")underset("| ")("C ")H-CH_(2)-CH_(3)` (iii)`CH_(3)-underset(CH_(3))underset("|")("C ")H-CH_(2)-Br` (IV)`CH_(3)-overset(CH_(3))overset("|")underset(CH_(3))underset("|")("C ")-Br` |
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| 23186. |
The shape of ethylene molecule is |
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Answer» Tetrahedral |
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| 23187. |
Which isomerism is shown by hte complex [Cr(H_(2)O)_(5)NCS]^(2+) ? |
| Answer» Solution :It shows linkage ISOMERISM. The isome has the STRUCTURE: `[Cr(H_(2)O)_(5)SCN]^(2+)` | |
| 23188. |
Which forms multimolecular layers during adsorption ? |
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Answer» Chemisorption |
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| 23189. |
Which one is most reactive towards nucleophilic addition reaction? |
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Answer»
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| 23190. |
Which of the following minerals contains Fe |
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Answer» MAGNETITE |
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| 23191. |
The specific conductance of 0.1N KCl solution at 23^@C is 0.012 Ohm^(-1) cm^(-1) . The resistance of the cell containing the solution at the same temperature was found to be 55 Ohm. The cell constant will be ………. . |
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Answer» `0.142 cm^(-1)` `:.` Cell constant = `k xx R` `= 0.012 xx 55` `= 0.66 cm^(-1)`. |
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| 23192. |
Which one of the following is used as a sweetening agent in confectionery and beverages? |
| Answer» Solution :Glycerol | |
| 23193. |
Which one of the following will not give white precipitate with ammonical silver nitrate solution |
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Answer» `CH_(3)=C^(@)C-CH_(3)` |
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| 23194. |
Which of the following equimolar solution is expected to have lowest freezing point ? |
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Answer» `0.5 M H_(3)PO_(3)` |
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| 23195. |
Writethe chemical name ,source and deficientof the following(i) VitaminB_(6)(ii) Vitamin B_(6)(iii)VitaminB_(9) (iv) Vitamin B_(12)(v) Vitamin C. |
Answer» SOLUTION :
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| 23196. |
What happens when ethanol is heated with conc. H_2SO_4 at 140^@C ? |
| Answer» SOLUTION :DIETHYLETHER is FORMED. | |
| 23197. |
Which of the following statements is not correct about order of a reaction? |
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Answer» The order of a reaction can be a fractional number General reaction `xA+yBto`Products Reaction rae =`k[A]^(x)[B]^(y)` So x and y are order of reaction of A and B and (x+y) is the order of reaction . |
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| 23198. |
Which of the following isa vinyl halide ? |
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Answer» Chloroethene 
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| 23199. |
Which represents correct difference for an ideal solution containing non-volatile solute ? |
| Answer» ANSWER :A | |
| 23200. |
The smogis essentiallycaused by the presenceof : |
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Answer» Oxidesis sulphurand NITROGEN |
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