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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.
| 3201. |
The structural formula of an ester is : H−H|C|H−O||C−O−H|C|H−H|C|H−H Write the formula of the acid and the alcohol from which it is formed. |
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Answer» The structural formula of an ester is : H−H|C|H−O||C−O−H|C|H−H|C|H−H Write the formula of the acid and the alcohol from which it is formed. |
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| 3202. |
Buffer solutions have cons†an t acidity and alkalinity because - (1)They have large excess of H^{+ }and OH^- (2) They have fixed value of pH (3)These give unionised acid or base on reaction with added acid or alkali (4) Acids and alkalis in these solutions are shielded from attack by other ions |
| Answer» Buffer solutions have cons†an t acidity and alkalinity because - (1)They have large excess of H^{+ }and OH^- (2) They have fixed value of pH (3)These give unionised acid or base on reaction with added acid or alkali (4) Acids and alkalis in these solutions are shielded from attack by other ions | |
| 3203. |
Which of the following alkyl halides has the maximum density? |
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Answer» Which of the following alkyl halides has the maximum density? |
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| 3204. |
Write equations fro the following:(i) Burning of ammonia in oxygen(ii) Catalytic oxidation of ammonia(iii) (a) Name the catalyst used in 1 (ii).(b) In the reaction referred to in 1 (ii), the catalyst glows red hot. Why?(c) What is the name of the industrial process which starts with the reaction referred to in 1 (ii)? |
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Answer» Write equations fro the following: (i) Burning of ammonia in oxygen (ii) Catalytic oxidation of ammonia (iii) (a) Name the catalyst used in 1 (ii). (b) In the reaction referred to in 1 (ii), the catalyst glows red hot. Why? (c) What is the name of the industrial process which starts with the reaction referred to in 1 (ii)? |
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| 3205. |
Take a long magnesium ribbon. Clean it well by scraping it with a knife. Cut the magnesium ribbon into small pieces which are less than half a centimeter long. Put one piece of this magnesium ribbon carefully into 5 mL dilute hydrochloric acid taken in a test tube. Write the observation. Experiment-2 Take 1 mL of acid in the test tube.Put the pieces of magnesium one by one into this.What may be the reason? |
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Answer» Take a long magnesium ribbon. Clean it well by scraping it with a knife. Cut the magnesium ribbon into small pieces which are less than half a centimeter long. Put one piece of this magnesium ribbon carefully into 5 mL dilute hydrochloric acid taken in a test tube. Write the observation. Experiment-2 Take 1 mL of acid in the test tube.Put the pieces of magnesium one by one into this.What may be the reason? |
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| 3206. |
What is the oxidation state of Fe in the product formed when acidified potassium ferrocyanide ( K4[Fe(CN6)] is treated with hydrogen peroxide ? How ? |
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Answer» What is the oxidation state of Fe in the product formed when acidified potassium ferrocyanide ( K4[Fe(CN6)] is treated with hydrogen peroxide ? How ? |
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| 3207. |
Question1 Why does the colour of copper sulphate solution change when an iron nail is dipped in it? |
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Answer» Question1 Why does the colour of copper sulphate solution change when an iron nail is dipped in it? |
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| 3208. |
12.How many ml of 0.3 M potassium dichromate is required for complete oxidation of 5 ml of 0.2 M SnC2O4 solution |
| Answer» 12.How many ml of 0.3 M potassium dichromate is required for complete oxidation of 5 ml of 0.2 M SnC2O4 solution | |
| 3209. |
(a) What is plaster of Paris? Write the chemical formula of plaster of Paris. (b) How is plaster of Paris prepared? Write the chemical equation of the reaction involved. (c) Explain why plaster of Paris should be stored in a moisture-proof container. (d) State two important uses of plaster of Paris. |
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Answer» (a) What is plaster of Paris? Write the chemical formula of plaster of Paris. (b) How is plaster of Paris prepared? Write the chemical equation of the reaction involved. (c) Explain why plaster of Paris should be stored in a moisture-proof container. (d) State two important uses of plaster of Paris. |
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| 3210. |
In le chatelier principle,1.The reaction which is favoured (be it forward or backward )proceeds at a higher rate as compared to the rate of this reaction in equilibrium condition.2.The reaction which is not favoured( be it forward or backward)proceeds at a slower rate as compared to the rate of this reaction in the equilibrium conditionAre these two statements correct? |
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Answer» In le chatelier principle, 1.The reaction which is favoured (be it forward or backward )proceeds at a higher rate as compared to the rate of this reaction in equilibrium condition. 2.The reaction which is not favoured( be it forward or backward)proceeds at a slower rate as compared to the rate of this reaction in the equilibrium condition Are these two statements correct? |
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| 3211. |
What would happen if(i) Calcium oxide is used to dry hydrogen chloride.(ii) Concentrated hydrochloric acid is kept open.(iii) Hydrogen chloride prepared in laboratory, is passed through water, using a delivery tube. |
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Answer» What would happen if |
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| 3212. |
10. An endothermic reaction has a positive internal energy change delta U.In such a case,what is the minimum value that activation energy can have? |
| Answer» 10. An endothermic reaction has a positive internal energy change delta U.In such a case,what is the minimum value that activation energy can have? | |
| 3213. |
1mole of H2 and 4moles of O2 effuse through orifice and at same temperature, then which is correct percentage of effuse volume of H2 and O2. (Assume they do not react) H2. O21). 50%. 50%2). 60%. 40%3). 30 %. 70%4). 10 %. 90% |
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Answer» 1mole of H2 and 4moles of O2 effuse through orifice and at same temperature, then which is correct percentage of effuse volume of H2 and O2. (Assume they do not react) H2. O2 1). 50%. 50% 2). 60%. 40% 3). 30 %. 70% 4). 10 %. 90% |
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| 3214. |
A few drops of ethanoic acid were added to solid sodium carbonate. The observation made was that :(1) a hissing sound was produced(2) brown fumes evolved(3) brisk effervescence occurred (4) a pungent smelling gas was evolved |
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Answer» A few drops of ethanoic acid were added to solid sodium carbonate. The observation made was that : (1) a hissing sound was produced (2) brown fumes evolved (3) brisk effervescence occurred (4) a pungent smelling gas was evolved |
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| 3215. |
A solute AB2 dissociates 50% and associates 30%(trimerise). The value of vant Hoff factor will be? A.3 B.2.2 C.1.8 D.1.2 |
| Answer» A solute AB2 dissociates 50% and associates 30%(trimerise). The value of vant Hoff factor will be? A.3 B.2.2 C.1.8 D.1.2 | |
| 3216. |
'If we excessively use pesticides to protect the crops from diseases, then it may cause long-term damage to mankind'. Justify this statement. |
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Answer» 'If we excessively use pesticides to protect the crops from diseases, then it may cause long-term damage to mankind'. Justify this statement. |
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| 3217. |
Explain briefly polar and non-polar covalent bond |
| Answer» Explain briefly polar and non-polar covalent bond | |
| 3218. |
In Antarctica, ozone depletion is due to formation of the following compound : |
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Answer» In Antarctica, ozone depletion is due to formation of the following compound : |
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| 3219. |
121. The square circuit 1234 shown is made of homogeneous wire of constant cross section.if the ratio of heat 12/heat 34 of the amounts of heat generated per unit time in conductor 12 and 34 is 11+n2.find n assuming 1234 is a square |
| Answer» 121. The square circuit 1234 shown is made of homogeneous wire of constant cross section.if the ratio of heat 12/heat 34 of the amounts of heat generated per unit time in conductor 12 and 34 is 11+n2.find n assuming 1234 is a square | |
| 3220. |
is it necessary to learn whole periodic table if not then till which element should i learn?? |
| Answer» is it necessary to learn whole periodic table if not then till which element should i learn?? | |
| 3221. |
is sigma bond possible if 1s and 2s orbital overlapped? |
| Answer» is sigma bond possible if 1s and 2s orbital overlapped? | |
| 3222. |
Calculate the weight of co having the same number of oxygen atoms as are present t in 22g of co2 |
| Answer» Calculate the weight of co having the same number of oxygen atoms as are present t in 22g of co2 | |
| 3223. |
What are the products of the reaction, CH3COOH+Na2CO3→ ? |
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Answer» What are the products of the reaction, CH3COOH+Na2CO3→ ? |
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| 3224. |
A, B & C are the elements of the Dobereiner's triads. If the atomic mass of A is 7 and that of C is 23, then the atomic mass of B will be __. |
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Answer» A, B & C are the elements of the Dobereiner's triads. If the atomic mass of A is 7 and that of C is 23, then the atomic mass of B will be |
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| 3225. |
In the Hall's process for extraction of aluminium,(a) give the formula and purpose of fluorspar and cryolite.(b) state the location of cathode and anode and explain what occurs at each electrode. |
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Answer» In the Hall's process for extraction of aluminium, (a) give the formula and purpose of fluorspar and cryolite. (b) state the location of cathode and anode and explain what occurs at each electrode. |
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| 3226. |
Which one of the following can act as Bronsted acid as well as Bronsted base? |
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Answer» Which one of the following can act as Bronsted acid as well as Bronsted base? |
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| 3227. |
Define valency of an element with respect to hydrogen. |
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Answer» Define valency of an element with respect to hydrogen. |
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| 3228. |
(NH2)2 serves as :-(1) Monodentate ligand, Non-chelating ligand(2) Bridging ligand, negative ligand(3) Bidentate ligand, chelating ligand(4) Bidendate ligand, Bridging ligand |
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Answer» (NH2)2 serves as :- (1) Monodentate ligand, Non-chelating ligand (2) Bridging ligand, negative ligand (3) Bidentate ligand, chelating ligand (4) Bidendate ligand, Bridging ligand |
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| 3229. |
IN HENRY'S LAW IT IS GIVEN THAT SOLUBILITY OF GAS INCREASES WITH PRESSURE AND THE FORMULA IS GIVEN AS P=KhX AND WE CAN SEE CLEARLY FROM THIS EQ THAT MORE Kh MORE PRESSURE AND MORE SOLUBILITY BUT THEN WHY IT IS GIVEN AS HIGHER THE VALUE OF Kh AT A GIVEN PRESSURE THE LOWER IS SOLUBILITY OF GAS IN THE LIQUID |
| Answer» IN HENRY'S LAW IT IS GIVEN THAT SOLUBILITY OF GAS INCREASES WITH PRESSURE AND THE FORMULA IS GIVEN AS P=KhX AND WE CAN SEE CLEARLY FROM THIS EQ THAT MORE Kh MORE PRESSURE AND MORE SOLUBILITY BUT THEN WHY IT IS GIVEN AS HIGHER THE VALUE OF Kh AT A GIVEN PRESSURE THE LOWER IS SOLUBILITY OF GAS IN THE LIQUID | |
| 3230. |
Which of the following will not convert N2H4 into N2 1) oxygen 2) CuSO43) Ozone4) Zn + HCl |
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Answer» Which of the following will not convert N2H4 into N2 1) oxygen 2) CuSO4 3) Ozone 4) Zn + HCl |
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| 3231. |
Observe the table and identify metals and nonmetals. Select the correct option. Sl.NoSet−1Set−21.Sodium(Na)Oxygen(O)2.Magnesium(Mg)Chlorine(Cl)3.Iron(Fe)Helium(He)4.Gold(Au)Sulphur(S)5.Calcium(Ca)Carbon(C) |
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Answer» Observe the table and identify metals and nonmetals. Select the correct option. |
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| 3232. |
Fluoride is used in toothpaste to prevent tooth |
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Answer» Fluoride is used in toothpaste to prevent tooth |
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| 3233. |
Question 1 (ii)Give an example of a metal which can be easily cut with a knife. |
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Answer» Question 1 (ii) Give an example of a metal which can be easily cut with a knife. |
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| 3234. |
Which of the following metals are produced by the electrolysis of their molten compounds ? A. Copper B. Silver C. Aluminium D. Sodium (a) A and B (b) B and C (c) C and D (d) only D |
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Answer» Which of the following metals are produced by the electrolysis of their molten compounds ? (a) A and B |
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| 3235. |
44. CH3CCCH3+Pd/CaCO3+(CH3COO)2Pb=B,CH3CCCH3+Na in liq NH3=A,the minimum heat of hydragention in which between A and B? |
| Answer» 44. CH3CCCH3+Pd/CaCO3+(CH3COO)2Pb=B,CH3CCCH3+Na in liq NH3=A,the minimum heat of hydragention in which between A and B? | |
| 3236. |
7 CH3_0_C+H2, CH3_NH_C+H2, CH3_S_C+H2. Correct stability order of carbocation? |
| Answer» 7 CH3_0_C+H2, CH3_NH_C+H2, CH3_S_C+H2. Correct stability order of carbocation? | |
| 3237. |
Why do electron want to attain octet configuration |
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Answer» Why do electron want to attain octet configuration |
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| 3238. |
what does first and second series in periods of mendeleev's periodic table mean? |
| Answer» what does first and second series in periods of mendeleev's periodic table mean? | |
| 3239. |
balancing of Br_2 +H_2O_2→ BrO_3+H_2O by ion electron method |
| Answer» balancing of Br_2 +H_2O_2→ BrO_3+H_2O by ion electron method | |
| 3240. |
Name the raw material used for the production of caustic soda. |
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Answer» Name the raw material used for the production of caustic soda. |
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| 3241. |
Why is formation of tertiary free radical necessary for sulphonation? |
| Answer» Why is formation of tertiary free radical necessary for sulphonation? | |
| 3242. |
24. 9 g impure sample of NaHCO3 on heating loses 3.1 g when heated to 300^° C. What is the amount of NaHCO3 in the sample? |
| Answer» 24. 9 g impure sample of NaHCO3 on heating loses 3.1 g when heated to 300^° C. What is the amount of NaHCO3 in the sample? | |
| 3243. |
What do you mean by chemical change and chemical reaction? Explain with suitable examples. |
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Answer» What do you mean by chemical change and chemical reaction? Explain with suitable examples. |
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| 3244. |
A metal whose alloy finds use in the construction of aircrafts in the powdered form is added to sodium hydroxide solution. A colourless gas was evolved and after reaction was over, the solution was colourless.(a) Name the powdered metal added to sodium hydroxide solution.(b) Name the gas evolved.(c) Name the salt present in the colourless solution. |
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Answer» A metal whose alloy finds use in the construction of aircrafts in the powdered form is added to sodium hydroxide solution. A colourless gas was evolved and after reaction was over, the solution was colourless. (a) Name the powdered metal added to sodium hydroxide solution. (b) Name the gas evolved. (c) Name the salt present in the colourless solution. |
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| 3245. |
Structure of but-2-ol? |
| Answer» Structure of but-2-ol? | |
| 3246. |
Is onyl Fe2O3+Al is considered as thermite reaction or any other metal oxide like Mn2O3+Al is also considered as thermite reaction |
| Answer» Is onyl Fe2O3+Al is considered as thermite reaction or any other metal oxide like Mn2O3+Al is also considered as thermite reaction | |
| 3247. |
What are the conditions necessary for the formation of an electrovalent bond ? |
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Answer» What are the conditions necessary for the formation of an electrovalent bond ? |
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| 3248. |
What is the meaning of S character |
| Answer» What is the meaning of S character | |
| 3249. |
9.What is dipolemoment? Compare dipolemoment of some elements |
| Answer» 9.What is dipolemoment? Compare dipolemoment of some elements | |
| 3250. |
The white precipitate which is formed in the detection of chloride ion is due to the formation of: |
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Answer» The white precipitate which is formed in the detection of chloride ion is due to the formation of: |
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