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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.
| 551. |
If enthalpies of formation of CO2(g) and H2O(l) at 25°C and 1 atm pressure, respectively are –x kJ/mol and –y kJ/mol then enthalpy of formation (in kJ/mol) of C2H4(g) will be [Given : Enthalpy of combustion of C2H4(g) is –z kJ/mol]z – 2x – 2yz + 2x – 2yz – 2x + 2yz + 3x – y |
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Answer» If enthalpies of formation of CO2(g) and H2O(l) at 25°C and 1 atm pressure, respectively are –x kJ/mol and –y kJ/mol then enthalpy of formation (in kJ/mol) of C2H4(g) will be [Given : Enthalpy of combustion of C2H4(g) is –z kJ/mol] z – 2x – 2y z + 2x – 2y z – 2x + 2y z + 3x – y |
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| 552. |
42. 4g of Naoh present in 100ml of solution .calculate the molarity of mole |
| Answer» 42. 4g of Naoh present in 100ml of solution .calculate the molarity of mole | |
| 553. |
Which one of the following is not true of metals:(a) Metals are good conductors of electricity.(b) Metals are malleable and ductile.(c) Metals form non-polar covalent compounds.(d) Metal will have 1 or 2 or 3 electrons in their valence shell. |
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Answer» Which one of the following is not true of metals: (a) Metals are good conductors of electricity. (b) Metals are malleable and ductile. (c) Metals form non-polar covalent compounds. (d) Metal will have 1 or 2 or 3 electrons in their valence shell. |
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| 554. |
Explain the difference between acid and base. |
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Answer» Explain the difference between acid and base. |
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| 555. |
what is doping? explain its types. |
| Answer» what is doping? explain its types. | |
| 556. |
what is sphalerite structure |
| Answer» what is sphalerite structure | |
| 557. |
Give reason : Toothpastes are basic in nature |
| Answer» Give reason : Toothpastes are basic in nature | |
| 558. |
Deer is the first animal in a food chain, which eats plant. What type of consumer is it? |
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Answer» Deer is the first animal in a food chain, which eats plant. What type of consumer is it? |
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| 559. |
For getting 1kg of Aluminium how many kg of carbon anode is burnt away in the metallurgy of Aluminium explain with the help of reaction. |
| Answer» For getting 1kg of Aluminium how many kg of carbon anode is burnt away in the metallurgy of Aluminium explain with the help of reaction. | |
| 560. |
What is the common name for methanoic acid (HCOOH) ? |
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Answer» What is the common name for methanoic acid (HCOOH) ? |
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| 561. |
Explain the following terms:(1) Rancidity(2) Endothermic reactions(3) Redox reactions(4) Neutralization |
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Answer» Explain the following terms: (1) Rancidity (2) Endothermic reactions (3) Redox reactions (4) Neutralization |
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| 562. |
Why the position of hydrogen in the modern periodic table considered anomalous? |
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Answer» Why the position of hydrogen in the modern periodic table considered anomalous? |
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| 563. |
The density of 3M aqueous solution of sodium thiosulphate is 1.25g/ml.calculate (1)mole fraction of sodium thiosulphate(2)molalities of Na+ and S2O3- ions. |
| Answer» The density of 3M aqueous solution of sodium thiosulphate is 1.25g/ml.calculate (1)mole fraction of sodium thiosulphate(2)molalities of Na+ and S2O3- ions. | |
| 564. |
which of these weights more 1)32g of o2 2)2g atom of nitrogen 3)0.5 mol of fe 4)3.01×10^{23 |
| Answer» which of these weights more 1)32g of o2 2)2g atom of nitrogen 3)0.5 mol of fe 4)3.01×10^{23 | |
| 565. |
Total number of orientations possible for f-sub-shell. |
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Answer» Total number of orientations possible for f-sub-shell. |
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| 566. |
18.How to prove chemical equilibrium is motional process? |
| Answer» 18.How to prove chemical equilibrium is motional process? | |
| 567. |
20 ml of 0.5 M NaOH require 30 ml HCl solution for neutralisation. What mass of HCl has been consumed in the reaction. |
| Answer» 20 ml of 0.5 M NaOH require 30 ml HCl solution for neutralisation. What mass of HCl has been consumed in the reaction. | |
| 568. |
In the naming of the given compound, the terminal carbon to the right will be the 1st carbon in the main chain. What is the IUPAC name of the given compound? |
Answer» In the naming of the given compound, the terminal carbon to the right will be the 1st carbon in the main chain. What is the IUPAC name of the given compound? |
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| 569. |
Aqua regia is a mixture of : |
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Answer» Aqua regia is a mixture of : |
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| 570. |
Question 23An element is sonorous and highly ductile. Under which category would you classify this element? What other characteristics do you expect the element to possess? |
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Answer» Question 23 An element is sonorous and highly ductile. Under which category would you classify this element? What other characteristics do you expect the element to possess? |
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| 571. |
In rock salt structure if coordination number is 6 then why will the sodium ions be present in the octahedral voids and why chloride ions will hv ccp lattice |
| Answer» In rock salt structure if coordination number is 6 then why will the sodium ions be present in the octahedral voids and why chloride ions will hv ccp lattice | |
| 572. |
15. Electron theory of acids and bases |
| Answer» 15. Electron theory of acids and bases | |
| 573. |
Why are metallic bonds more stronger than hydrogen bonds ? |
| Answer» Why are metallic bonds more stronger than hydrogen bonds ? | |
| 574. |
Given E∘Cl2/Cl−=1.36 V,E∘Cr3+/Cr=−0.74VE∘Cr2O2−7/Cr3+=1.33V,E∘MnO−4/Mn2+=1.51V Among the following, the strongest reducing agent is |
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Answer» Given |
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| 575. |
The maximum number of isomers possible for n-pentane is.3 |
Answer» The maximum number of isomers possible for n-pentane is
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| 576. |
Answer the following: [5 MARKS] (a) What is the composition of saturated solution of hydrogen chloride gas in water? (b) What do you see when conc. hydrochloric acid is added to lead(IV) oxide with warming? (c) What must be added to must be added to sodium chloride to obtain hydrogen chloride? d) What do you see when hydrogen chloride mixes with ammonia? |
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Answer» Answer the following: [5 MARKS] (a) What is the composition of saturated solution of hydrogen chloride gas in water? (b) What do you see when conc. hydrochloric acid is added to lead(IV) oxide with warming? (c) What must be added to must be added to sodium chloride to obtain hydrogen chloride? d) What do you see when hydrogen chloride mixes with ammonia? |
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| 577. |
The EMF of the cell No/Ni2+ (0.01M) // cl-(0.01M)/ Cl2 PT it ? . If SRP of nickel and chlorine electrode are -0.25V and +1.36 respectively |
| Answer» The EMF of the cell No/Ni2+ (0.01M) // cl-(0.01M)/ Cl2 PT it ? . If SRP of nickel and chlorine electrode are -0.25V and +1.36 respectively | |
| 578. |
Calculate concentration of H^+ ions in a mixture of 0.02 M acetic acid and 0.2 sodium acetate .given that the ionization cons†an t K_a for acetic acid is 1.8 ×10^- |
| Answer» Calculate concentration of H^+ ions in a mixture of 0.02 M acetic acid and 0.2 sodium acetate .given that the ionization cons†an t K_a for acetic acid is 1.8 ×10^- | |
| 579. |
What is the name of functional group -OH? |
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Answer» What is the name of functional group -OH? |
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| 580. |
Ethanoic acid was added in drops to water and it was noticed that:(1) the acid formed a separate layer on the top of water(2) water formed a separate layer on the top of the acid(3) a clear and homogeneous solution was formed(4) a pink and clear solution was formed |
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Answer» Ethanoic acid was added in drops to water and it was noticed that: (1) the acid formed a separate layer on the top of water (2) water formed a separate layer on the top of the acid (3) a clear and homogeneous solution was formed (4) a pink and clear solution was formed |
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| 581. |
39. If the average atomic mass of an element is 35.5u.then the mole ratio of the isotopes 35Cl to 37Cl in the nature is |
| Answer» 39. If the average atomic mass of an element is 35.5u.then the mole ratio of the isotopes 35Cl to 37Cl in the nature is | |
| 582. |
What will be the correct IUPAC name for the following compound ? |
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Answer» What will be the correct IUPAC name for the following compound ? |
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| 583. |
Calculate the density of diamond from the fact that it has face centered cubic structure with two atoms per lattice point and unit cell edge length of 3.569 A^°. |
| Answer» Calculate the density of diamond from the fact that it has face centered cubic structure with two atoms per lattice point and unit cell edge length of 3.569 A^°. | |
| 584. |
ntIt is possible to force B2O3 to behave as basic oxides with P4O10 or As4O10. Find minimum amount of B2O3 required to react with 14.2 kg P4O10.n |
| Answer» ntIt is possible to force B2O3 to behave as basic oxides with P4O10 or As4O10. Find minimum amount of B2O3 required to react with 14.2 kg P4O10.n | |
| 585. |
Burning of fossils fuels causes air pollution because they release on combustion. |
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Answer» Burning of fossils fuels causes air pollution because they release |
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| 586. |
Cu+ is not stable and undergoes disproportionation. E0 for Cu+ disproportionation is :Given standard reduction potentials,E0Cu2+/Cu+=+0.15 VE0Cu+/Cu=0.53 V |
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Answer» Cu+ is not stable and undergoes disproportionation. E0 for Cu+ disproportionation is : Given standard reduction potentials, E0Cu2+/Cu+=+0.15 VE0Cu+/Cu=0.53 V |
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| 587. |
What is actually the stability of an atom and why are noble gas configuration stable?? |
| Answer» What is actually the stability of an atom and why are noble gas configuration stable?? | |
| 588. |
A gas at 65∘C occupies 4.22 L. At what Celsius temperature will the volume be 3.87 L? |
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Answer» A gas at 65∘C occupies 4.22 L. At what Celsius temperature will the volume be 3.87 L? |
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| 589. |
what is true soluction? |
| Answer» what is true soluction? | |
| 590. |
Zinc liberates hydrogen gas when reacted with dilute hydrochloric acid, whereas copper does not. Explain why? |
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Answer» Zinc liberates hydrogen gas when reacted with dilute hydrochloric acid, whereas copper does not. Explain why? |
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| 591. |
Choose the correct word/phrase from within the brackets to complete the following sentences:(i) The catalyst used for conversion of ethene to ethane is commonly __________ (nickel/iron/cobalt).(ii) When acetaldehyde is oxidized with acidified potassium dichromate, it forms _________ (ester/ethanol/acetic acid).(iii) Ethanoic acid reacts with ethanol in presence of concentrated H2SO4, so as to form a compound and water. The chemical reaction which takes place is called __________ (dehydration/hydrogenation/esterification).(iv) Write the equation for the reaction taking place between 1, 2-dibromoethane and alcoholic potassium hydroxide.(v) The product formed when ethene gas reacts with water in the presence of sulphuric acid is ________ (ethanal/ethanol/ethanoic acid). |
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Answer» Choose the correct word/phrase from within the brackets to complete the following sentences: (i) The catalyst used for conversion of ethene to ethane is commonly __________ (nickel/iron/cobalt). (ii) When acetaldehyde is oxidized with acidified potassium dichromate, it forms _________ (ester/ethanol/acetic acid). (iii) Ethanoic acid reacts with ethanol in presence of concentrated H2SO4, so as to form a compound and water. The chemical reaction which takes place is called __________ (dehydration/hydrogenation/esterification). (iv) Write the equation for the reaction taking place between 1, 2-dibromoethane and alcoholic potassium hydroxide. (v) The product formed when ethene gas reacts with water in the presence of sulphuric acid is ________ (ethanal/ethanol/ethanoic acid). |
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| 592. |
Question 10. Sodium hydrogen carbonate, when added to acetic acid, evolves a gas. Which of the following statements are true about the gas evolved? (i) It turns lime water milky (ii) It extinguishes a burning splinter (iii) It dissolves in a solution of sodium hydroxide (iv) It has a pungent odour (a) (i) and (ii) (b) (i), (ii) and (iii) (c) (ii), (iii) and (iv) (d) (i) and (iv) |
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Answer» Question 10. |
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| 593. |
Distance travelled by a given body in a given time |
| Answer» Distance travelled by a given body in a given time | |
| 594. |
10. The volume of 0.1 N dibasic acid sufficient to neutralise 1 g of a base that furnishes 0.04 mole OH in aqueous solution is 1) 200 ml 2)400ml 3)600ml 4)800ml |
| Answer» 10. The volume of 0.1 N dibasic acid sufficient to neutralise 1 g of a base that furnishes 0.04 mole OH in aqueous solution is 1) 200 ml 2)400ml 3)600ml 4)800ml | |
| 595. |
Na2O adopts anti-fluorite crystal structure. The position of Na+ in the structure is |
| Answer» Na2O adopts anti-fluorite crystal structure. The position of Na+ in the structure is | |
| 596. |
why para hydrogen has low melting point than ortho hydrogen? |
| Answer» why para hydrogen has low melting point than ortho hydrogen? | |
| 597. |
explain the difference between stp and ntp.when volume is 22.4L and when it is 22.7L |
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Answer» explain the difference between stp and ntp. when volume is 22.4L and when it is 22.7L |
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| 598. |
The fraction of a floating body of volume Vo and density do above the surface of a liquid of density d will be - |
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Answer» The fraction of a floating body of volume Vo and density do above the surface of a liquid of density d will be - |
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| 599. |
42. If 20 ml .1 N acetic acid and 10 ml .1 N NaOH solution is mixed then what is the pH of the solution? |
| Answer» 42. If 20 ml .1 N acetic acid and 10 ml .1 N NaOH solution is mixed then what is the pH of the solution? | |
| 600. |
Phenol is |
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Answer» Phenol is |
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