Saved Bookmarks
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.
| 19451. |
Which statements is not suitable for interstitial compounds? |
|
Answer» They are HARD due to LOCALISATION of free electrons |
|
| 19452. |
Which of the following ions has the maximum magnetic moment ? |
| Answer» Answer :A | |
| 19453. |
Which one of the following is the catalyst poison in Haber's process? |
|
Answer» `AS_2S_3` |
|
| 19454. |
Which metal loses its meniscus after reaction with ozone ? |
|
Answer» Ag |
|
| 19455. |
What is the best substances for drying ammonia and why? |
| Answer» Solution :Ammonia can be best dried by passing over quick LIME, CAO, SINCE, there is no REACTION between them. However, conc. `H_2SO_4, P_2O_5` of anhydrous `CaCl_2` can.t be used for the purpose because `NH_3` REACTS with them as follows: | |
| 19456. |
Which of the following ions has the maximum magnetic moment |
| Answer» Answer :A | |
| 19457. |
When silver electrode having reduction potential 0.80 volt is connected to NHE to make a cell, will it act as anode or cathode? Give reason for your anwer. |
| Answer» SOLUTION :As REDUCTION POTENTIAL of silver ELECTRODE is +ve while that of NHE is '0', EMF of the cell will be +ve only if reduction takes place at the silver electrode i.e., it will act as cathode. | |
| 19458. |
What is the reagent used to distinguish acetaldehyde from acetone ? |
|
Answer» TOLLEN's REAGENT |
|
| 19459. |
Which of the following reactions occur during calcination ? |
|
Answer» `CaCO_3 to CaO + CO_2` |
|
| 19460. |
What happens when chlorobenzene is subjected to hydrolysis. |
Answer» SOLUTION :The reactions are EXPLAINED as under :  `+NaOH (aq) overset(DELTA ) to ` No REACTION |
|
| 19461. |
What is a biodegradable polymer?Give an example of a biodegradable aliphatic polyester. |
|
Answer» Solution :POLYMERS which DISINTEGRATE by themselves over a period of TIME due to environmental degradation by bacteria, etc. are called biodegradable polymers. EXAMPLE: PHBV (POLY hydroxy butrate - co - `beta`hydroxyvalerate) |
|
| 19462. |
The reduction potential diagram (Latimer diagram) for Cu is acid solution Calculate x. Does Cu^(+) disproportionate in the solution? |
|
Answer» Solution :`Cu^(2+),e to Cu^+ , E^@=0.15 , Delta G^@=n F E^@=-1 times 0.15 F =-0.15 F` `Cu^+ + e to Cu: E^@= 0.50, Delta G^@=-1 times 0.50 F=-0.50 F` On adding `Cu^(2)+2 e to Cu, Delta G^@=-0.65 F` `E_(Cu^(2+),Cu)^@=(Delta G^@)/(- n F)=(-0.65 F)/(-2F)=0.325 ` volt `x=0.325` volt Further `Cu^+ to Cu^(2+) +e, Delta G^@=-nFE^@=-1 times (-0.15)F=0.15 F` `Cu^+ +e to Cu, Delta G^@=-nFE^@=-1 times 0.50 times F=-0.50 F` `=0.0591/n log {[Ag^+]_(righ t)/[Ag^+]_(l eft)}` `=0.0591/1 log""0.1/0.001=0.0591 log 100` `=0.1182` volt Since `E_(CELL)` is positive, the right electrode will act as CATHODE (where REDUCTION occurs) and the left electrode will act as anode (where oxidation occurs) The electrons will thus travel from left to right in external circuit. |
|
| 19463. |
Which of the following is non-electrolyte ? |
|
Answer» NACL |
|
| 19464. |
The vapour pressure of pure A is 10 torr and at the same temperature when 1g of B is dissolved in 20 g of A, its vapour pressure is reduced to 9.0 torr. If the molecular mass of A is 200 amu, then the molecular mass of B is |
| Answer» ANSWER :B | |
| 19465. |
Which of the following is the most volatile compound ? |
|
Answer» HCl |
|
| 19466. |
Which of the following statements is not correct regarding bonding molecular orbital ? |
|
Answer» BONDING molecular orbitals possess less energy than the atomic orbitals from which they are formed. |
|
| 19467. |
Which of the following oxides of nitrogen is the anhydride of nitrous acid? |
|
Answer» NO |
|
| 19468. |
What is an acidic oxide? Give examples. |
|
Answer» Solution :An oxide that combines with water to give an acid is called acidic oxide : `SO_(2)+H_(2)Orarr UNDERSET("Acid")(H_(2)SO_(3))` Examples : `SO_(2), Cl_(2)O_(7), CO_(2), N_(2),O_(5)` Note : Generally non metals oxides and oxides of same metals in high oxidation state have acidic character. Examples of acidic metal oxides `-Mn_(2)O_(7), Cr_(2)O_(3), V_(2)O_(5)`. |
|
| 19469. |
Which decolourizes aqueous bromine and gives white fumes of HCI on reaction with PCl_5: |
|
Answer» `CH_3CH_2CH_2CH_2CH` |
|
| 19470. |
Which of the following statements is not correctregarding CH_3CH_2CHO and CH_3COCH_3. |
|
Answer» `CH_3CH_2CHO` givessodium bisulphite test . |
|
| 19471. |
Why are complex ions readily formed when water molecules react with the cation but not with the hydronium ions ? |
| Answer» Solution :Water can easily DONATE a lone pair of ELECTRONS to the metal CATION to form COMPLEX ions but hydronium ions `(H_3O^(+))` due to the presence of POSITIVE charge are unable to form a bond with metal cation. | |
| 19472. |
What is aquaregia ? How is it formed ? |
| Answer» SOLUTION :Aquaregia. means .kingly water.. It is a wonderful solvent which DISSOLVES in it all materials including NOBLE metals LIKE gold, platinum etc. | |
| 19473. |
What will be the prefix in the following compound? HOOCH-CH_(2)-overset(HOOC-CH_(2))(CH)-CH_(2)-CH_(2)-COOH |
|
Answer» methylcarboxy |
|
| 19474. |
Toluene reacts with a halogen in the presence of iron (III) chloride giving ortho and para halo compounds. The reaction is |
|
Answer» ELECTROPHILIC elimination reaction |
|
| 19475. |
Which statement is true for cyclohexane ? |
|
Answer» It has two possible isomers |
|
| 19476. |
Write the IUPAC name of the following coordination compound: [Fe(CN)_6]^(4-) |
| Answer» SOLUTION :Hexa-cyanoferrate (II) ION | |
| 19477. |
Which of the following is INCORRECT with respect to a methyl cation / |
|
Answer» The carbon ATOM in `SP^(2)` hybridised. |
|
| 19478. |
Whichof the following is formedby the action of wateron Na_(2)O_(2) |
|
Answer» `H_(2)` |
|
| 19479. |
Write the structures of major and minor products formed when 3-chloro-2-methylpentane is subjected to deliydrohalogenation. |
|
Answer» Solution :The products of dehydrohalogenation are formed ACCORDING to Saytzeff RULE. More substituted alkene is the major product. `CH_3-underset(CH_3)underset(|)(C)H-underset(CL)underset(|)(C)H-CH_2-CH_3rarr ` `underset("(major product)")(underset("2 - methylpent - 2 - ENE")(CH_3-underset(CH_3)underset(|)(C)=CH-CH_2-CH_3 +))` `underset("(minor product)")underset(("4-methyl pent-2-ene"))(CH_3-underset(CH_3)underset(|)(CH)-CH=CH-CH_3)` |
|
| 19480. |
What happens when nitropropane reacts with bromine in presence of NaOH ? |
Answer» SOLUTION :
|
|
| 19481. |
Which of the following singlet carbene is most stable |
|
Answer» `:CF_2` |
|
| 19482. |
Which of the following reactions takes place at higher temperature range (900 K-1500 K) in blast furnace ? |
|
Answer» `3Fe_(2)O_(3) + CO to 2Fe_(3)O_(4) + CO_(2)` `C+CO_(2) to 2CO, FeO + CO to Fe + CO_(2)` |
|
| 19483. |
Which of these is soluble in NaOH? |
|
Answer» Nitroethane |
|
| 19484. |
Which alkene yields only acetone on reductive ozonolysis ? |
|
Answer» SOLUTION :2,3 - Dimethylbut -2- ene YIELDS only ACETONE on reductive OZONOLYSIS . `CH_3 - OVERSET(CH_3)overset(|)C=underset(CH_3)underset(|)C-CH_3+O_3overset(H_2O)underset(Zn)rarr2CH_3-overset(CH_3)overset(|)C=O` |
|
| 19485. |
Which polymer having a "ester" linkage ? |
| Answer» Solution :Terylene | |
| 19486. |
The total number of acylic structural and optical isomers possible for a hydrocarbon of molecular formula C_(7)H_(16) is |
|
Answer» 12 
|
|
| 19487. |
Which of the following amines can be prepared by Gabriel method ? (i)CH_3CH_2NH_2, (ii)(CH_3)_2CHNH_2 , (iii)(CH_3)_3CNH_2 , (iv)C_6H_5NH_2 |
|
Answer» (i) and (iii) |
|
| 19488. |
When vapour of an alcohol are passed over hot reduced copper, alcohol is converted into alkene quickly , the alcohol is |
|
Answer» Primary |
|
| 19489. |
The word "aromatic" through started with benzene and its derivatives only, now it signifies a large variety of organic compounds. To examine the presence of aromaticity, the following tips are useful. Ensure that your compound is cyclic. Each corner of the ring is either a double bonded atom, or must carry a negative charge or a positive charge or a hetero atom planar. You may get deceived while examiningthis. On the plane of the paper everything appears planar unless specially specified. Your compound should have a closed shell of (4n+2) electrons. When the closed loop contains 4n electrons, the system is rather less stable or antiaromatic. In fused ring system some of the rings give up their aromatic nature to adjacent rings in a property knwon as "annellation". Which of the following is most acidic |
|
Answer»
The ion as a WHOLE is aromatic. Annellation causes the electron to be less availabletowards the five membered ring. As a RESULT, the central ring is not much INTERESTED to lose proton. |
|
| 19490. |
Which factor imparts the crytalline nature to a polymer like nylon? |
|
Answer» STRONG intermolecularforces like hydrogen bonding between chains. |
|
| 19491. |
Which of the following causes outbreak of jaundice |
|
Answer» AIR pollution |
|
| 19492. |
Which of the following oxides shows electrical properties like metals? |
|
Answer» `SiO_2` |
|
| 19493. |
The vapour pressure of pure benzene at a certain tempreature is 0.850 bar. A non-volatile. non-electrolyte solid weighing 0.5g, when added to 39.0g of benzene (molar mass of benzene 78g mol^-1) vapour pressure of the solution then is 0.845 bar. What is the molar mass of the solid substance? |
|
Answer» Solution :`"Given "P_(1)^(@)="0.850 bar,"w_(2)=0.5,""w_(1)=39.0,""m_(1)=78,""P_(1)="0.845 bar"` `(p_(1)^(@)-p_(1))/(p_(1)^(@))=(w_(2))/(m_(2))xx(m_(1))/(w_(1))` `=(0.850-0.845)/(0.850)=(0.5xx78)/(m_(2)xx39)` `THEREFORE M_(2)^(r)="170 g MOL"^(-1)` |
|
| 19494. |
Which gas is evolved at cathode dring the electrolysis of an aqueous solution of NaCl? |
| Answer» SOLUTION :HYDROGEN or `H_(2)`. | |
| 19495. |
The word "aromatic" through started with benzene and its derivatives only, now it signifies a large variety of organic compounds. To examine the presence of aromaticity, the following tips are useful. Ensure that your compound is cyclic. Each corner of the ring is either a double bonded atom, or must carry a negative charge or a positive charge or a hetero atom planar. You may get deceived while examiningthis. On the plane of the paper everything appears planar unless specially specified. Your compound should have a closed shell of (4n+2) electrons. When the closed loop contains 4n electrons, the system is rather less stable or antiaromatic. In fused ring system some of the rings give up their aromatic nature to adjacent rings in a property knwon as "annellation". Which of the following is likely to be a solid |
|
Answer»
|
|
| 19496. |
When ferrous oxalate is titrated against K_(2)Cr_(2)O_(7), milli equivalents of Fe^(2+),C_(2)O_(4)^(2-)andCr_(2)O_(7)in the redox reaction are X,Y and Z respectively , then :- |
|
Answer» `X=Y` |
|
| 19497. |
The word "aromatic" through started with benzene and its derivatives only, now it signifies a large variety of organic compounds. To examine the presence of aromaticity, the following tips are useful. Ensure that your compound is cyclic. Each corner of the ring is either a double bonded atom, or must carry a negative charge or a positive charge or a hetero atom planar. You may get deceived while examiningthis. On the plane of the paper everything appears planar unless specially specified. Your compound should have a closed shell of (4n+2) electrons. When the closed loop contains 4n electrons, the system is rather less stable or antiaromatic. In fused ring system some of the rings give up their aromatic nature to adjacent rings in a property knwon as "annellation". Which of the following has the highest value of dipole moment |
|
Answer»
|
|
| 19498. |
The word "aromatic" through started with benzene and its derivatives only, now it signifies a large variety of organic compounds. To examine the presence of aromaticity, the following tips are useful. Ensure that your compound is cyclic. Each corner of the ring is either a double bonded atom, or must carry a negative charge or a positive charge or a hetero atom planar. You may get deceived while examiningthis. On the plane of the paper everything appears planar unless specially specified. Your compound should have a closed shell of (4n+2) electrons. When the closed loop contains 4n electrons, the system is rather less stable or antiaromatic. In fused ring system some of the rings give up their aromatic nature to adjacent rings in a property knwon as "annellation". Which of the following is the most stable isomer of the hydrocarbon C_(10)H_(10) |
|
Answer»
|
|
| 19499. |
Which of the following are condendation copolymers ? |
|
Answer» NYLON-6 |
|
| 19500. |
What is formula of green vitriol ? |
| Answer» SOLUTION :`FeSO_4xx7H_2O` | |
