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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.
| 22651. |
The resistance of 0.01N solution of an electrolyte AB at 328K is 100 ohm. The specific conductance of solution is( cell constant =1 cm^(-1) ) |
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Answer» 100 ohm |
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| 22652. |
Write the cell reaction of a lead storage battery when it is discharged. How does the density of the electrlyte change when the battery is discharged? |
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Answer» Solution :`Pb+PbO_(2)+2H_(2)SO_(4)to2PbSO_(4)+2H_(2)O` Density of sulphuric acid solution decreases as water is FORMED and sulphuric acid is CONSUMED during GRADUALLY. |
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| 22653. |
Which of the following shows bond in silicon: |
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Answer» Si-Si-Si-Si |
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| 22654. |
Which of the following on heating undergoes disproportionation |
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Answer» `H_3PO_3` |
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| 22655. |
Which forms maximum compounds with xenon |
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Answer» F |
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| 22656. |
The temperature of an ideal gas is increased from 140K to 560K. If at 140K, the root mean square velocity of the gas is x, at 560K it becomes |
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Answer» 5x `:. x = sqrt(( 3R XX 560 )/( M ))` at 560K,x. = `sqrt(( 3R xx 560)/( M))` `( x.)/( x) = sqrt(( 560)/( 140)) = 2` `x. = 2x` |
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| 22657. |
Write the integrated rate equation for 1st order reaction. |
| Answer» SOLUTION :`K=2.303/tlog(a/(a-x))` | |
| 22658. |
The standard reduction potential of the Ag | Ag electrode at 298 K is 0.799 V. Given that for AgI, K_(sp) = 8.7 xx 10^(-17) , evaluate the potential of the Ag^(+) | Agelectrode in a saturated solution of AgI. Also, calculate the standard reduction potential of the I^(-) | AgI | Agelectrode. |
| Answer» SOLUTION :0.3244 V,-0.15 V | |
| 22659. |
Why are Mn^(2+) compounds more stable than Fe^(2+) comounds towards oxidation to their +3 state ? |
| Answer» Solution :Electronic configuration of `Mn^(2+)` is `3d^(5)` which is HALF FILLED and hence stable. Therefore, 3rd ionizatio enthalpy is very high, i.e., 3rd electron cannot be LOST easily. In case of `FE^(2+)` , electronic configuration is `3d^(6)` . Hence, it can loseone electron easily to give the stable configuration `3d^(5)` | |
| 22660. |
Write equation for the reaction of glucose with periodic acid. |
Answer» SOLUTION :
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| 22661. |
Which metal is electro-deposited on iron surface to prevent rusting |
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Answer» Cu |
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| 22662. |
To 100 mL of 0.1 MAg NO_3 solution solid K_2S_4 is added. Find the concentration of K_2SO_4 that shows the precipitation. (K_sp for Ag_2SO_4 = 6.4 xx 10^-5 M) |
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Answer» 0.1 M |
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| 22663. |
Write the IUPAC names of the following coordination compounds : K_(3)[Fe(C_(2)O_(4))_(3)] |
| Answer» SOLUTION :POTASSIUM trioxalatoferrate(III) | |
| 22664. |
Which one of the following compounds is the best choice for being prepared by an efficient mixed aldol addition reaction. |
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Answer»
 FORMALDEHYDE is HIGHLY REACTIVE towards nucleophilic ATTACK. |
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| 22665. |
What are thermoplastic and thermosetting polymers ? Give one example of each. |
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Answer» Solution :Thermoplastic POLYMERS : These are the linear or slightly branched long chain molecules capable of repeatedly softening on heating and hardening on cooling. These polymers possess intermolecular forces of ATTRACTION intermediate between those in ELASTOMERS and fibres. Polythene and polystyrene are examples of thermoplastic polymers. Thermosetting polymers : These polymers are cross linked or heavily branched molecules, which on heating undergo extensive cross linking in MOULDS and become infusible. These cannot be reused. BAKELITE, urea-formaldehyde resins are examples of thermosetting polymers. |
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| 22666. |
Which among the following is a step growth polymer |
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Answer» PTFE |
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| 22667. |
What will be the product formed when phenol is treated with zinc dust? |
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Answer» CUMENE |
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| 22668. |
The weight range over which electronic excitations in organic compounds occur, is |
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Answer» |
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| 22669. |
Which compounds acts as an oxidising as well as reducing agent? |
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Answer» `SO_(2)` |
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| 22670. |
When F_(2) reacts with hot and conc. Alkali, then following will be obtained: (i) OF_(2) (ii) O_(2) (iii) H_(2)O (iv) NaF |
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Answer» I,III and iv |
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| 22671. |
Which of the following is a secondary standard substance? |
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Answer» `Na_(2)CO_(3). 10H_(2)O` `4MnO_(4)^(-)+4H^(+) rarr 4MnO_(2)+3O_(2)+2H_(2)O` Sodium carbonate, `Na_(2)CO_(3)*10 H_(2)O` is a primary standard for solution of acids. Ferrous compounds are easily oxidized and so are difficult to obtain pure. However, the double salt `FeSO_(4)*(NH_(4))_(2)SO_(4)*6H_(2)O`, called Mohr's salt is used as a standard COMPOUND in volumetic ANALYSIS for titrations with oxidizing AGENTS such as dichromate, permanganate and citric solutions. hydrated sodium thiosu,phate `Na_(2)S_(2)O_(3)*5H_(2)O` called 'hypo' is readily solube in water and solutions are used for iodinetitrations in volumetric analysis. Iodine very rapidly oxidizes thiosulphate ions `S_(2)O_(3)^(2-)` to tetrathionate ions `S_(4)O_(6)^(2-)`, and the `I_(2)` is reduced to `I_(-)` ions. |
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| 22672. |
What is the vapour density of PCl_5at 250^@ C when dissociated to the extent of 80%? |
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Answer» |
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| 22673. |
Which of the following is a simple ether |
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Answer» `CH_(3)OCH_(3)` |
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| 22674. |
Which combination is correct for K metal |
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Answer» (I)(iv)(S) BeO is Amphoteric oxide in nature `(BeH_2)_n`  ELECTRON deficient and polymeric (II)VIOLET colour in flame test ( K Metal) `KO_2`(Potassium super oxide ) is orange yellow `KO_3`(Potassium ozonide) is orange-red SOLID (III)yellow colour in flame test (NA metal) `Na_2CO_3`(sodium carbonate ) is manufactured by solvay process microcosmic salt `to Na(NH_4)HPO_4. 4H_2O` |
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| 22675. |
Under the same reaction conditions, initial concentration of 1.386 mol dm^(-3) of a substance becomes half in 40 seconds and 20 seconds through first order and zero order kinetics, respectively. Ratio (k_(1)//k_(0)) of the rate constant for first order (K_(1)) and zero order (k_(0)) of the reactions is |
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Answer» `0.5mol^(-1)DM^(3)` |
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| 22676. |
Which of the following is an example of addition polymer ? |
| Answer» Answer :A | |
| 22677. |
Which of the following type of catalysis can be explained by the adsorption theory ? |
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Answer» HOMOGENEOUS catalysis |
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| 22678. |
Why are certain drugs called enzyme inhibitors ? |
| Answer» Solution :Some DRUGS can BLOCK the BINDING site of the enzyme and prevent the binding of substrate, or can inhibit the catalytic ACTIVITY of the enzyme. Such drugs are called enzyme inhibitors. | |
| 22679. |
What is the effect of temperature of chemisorption ? |
| Answer» | |
| 22680. |
Write the formula of a compound where transition metal is in +7 oxidation state. |
| Answer» SOLUTION :`KMnO_4` | |
| 22681. |
Which halide of magnesium has highest ionic character? |
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Answer» CHLORIDE |
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| 22682. |
Whichamongthefollowinggenera (plants )is thefuture source of hydrocarbons ? |
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Answer» CASSIA |
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| 22683. |
To a solution of a salt, MgSO_4 solution is added and white ppt. appears only on heating. The acid radical in the salt is |
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Answer» `CO_(3)^(2-)` `Mg(HCO_(3))_(2) OVERSET(Delta)tounderset("WHITE PPT.")(MgCO_(3) darr) +H_(2)O +CO_(2)` |
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| 22684. |
Which metal is used in manufacturing artificial joints? |
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Answer» Molybdenum |
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| 22685. |
What is aqua-regia ? How it works to dissolve noble metals ? |
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Answer» Solution :Aqua-regia is `3:1` mixture of CONC. `HNO_(3)` and conc. HCL. The mixture contains NASCENT chlorine produced due to reductionof HCl by `HNO_(3)`. This chlorine reacts with noble metals to dissolve them. `HNO_(3)+3HCl to 2H_(2)O+2Cl+NOCl` `Au+3Cl to AuCl_(3)` `AuCl_(3)+HCl to HAuCl_(4)` (chloroauric acid) |
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| 22686. |
Which of these is not true regarding electromeric effect ? |
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Answer» It results in appearance of PARTIAL charges on the carbon atoms. |
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| 22687. |
Which of the following are all features of isomers of [Co (en)_(3)] Cl_(3) ? Isomers are |
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Answer» superimosable mirror IMAGES with identical CHEMICAL forumulae and the same chemical reactivities with other COMPOUNDS that are not optical isomers |
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| 22688. |
Which statements are correct ? |
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Answer» During formation of micelle from soap solution above craft temperature only systems Gibb's energy decreases |
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| 22689. |
What will be the volume of the mixture after the reaction :NH_3 (g) (1L) + HCl (g) (1.5L) toNH_4Cl (s) |
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Answer» 1.5 L |
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| 22690. |
What is the possiblenumber of monohydroxy derivatives of an aliphaticalkane (hydrocarbon) consisting of total five carbon atoms including only onemethyl groupas a branch ? |
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Answer» 2 |
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| 22691. |
Write IUPAC name of the following: CH_(3)-underset(CH_(3))underset(|)(C)=underset(Br)underset(|)(C)-OH |
| Answer» SOLUTION :2-Bromo-3-methyl but-2-ene-1-ol. | |
| 22692. |
Which one among the following does not have an allotrope ? |
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Answer» OXYGEN |
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| 22693. |
Which of the followingcompounds will give a yellow precipitate with iodine and alkali? |
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Answer» 2-hydroxypropane |
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| 22694. |
Vitamin E is also called |
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Answer» Cyanocobalamin |
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| 22695. |
Write the mechanism of reaction of ethers with hydrogen halides. |
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Answer» Solution :`to` The reaction of ether with HI STARTS with the protonation of ether molecule. Step-1 :  `to` The reaction takes place with HBr or HI because these reagents are sufficiently acidic. Step-2: `to` Iodide is a good nucleophile. It attacks the least substituted carbon of the oxonium ion formed in step-1 and displaces an alcohol molecule by `S_(N)2` mechanism. Thus in the cleavage of mixed ethers with two different alkyl groups, the alcohol and alkyl iodide formed, depend on the nature of alkyl groups. When PRIMARY or SECONDARY alkyl groups are present, it is lower alkyl group that FORMS alkyl iodide (`S_(N)2` reaction).  `to` When HI is in excess and the reaction is carried out at high temperature, ethanol reacts with another molecule of HI and is CONVERTED to ethyl iodide. Step-3 : 
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| 22696. |
The number of oxygen atoms in borax which do not from ppi-ppi back bond is: |
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Answer» 3 |
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| 22697. |
Three dimensional by replacing……………… units by ………………………. . |
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Answer» |
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| 22699. |
Write the formula of the noble gas species that is isostructural with (i) ICl_(4)^(-) (i) BrO_(3)^(-) |
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Answer» Solution :(i) ICI is isostructural with `XeF_2` SINCE both are linear. (ii) `BrO_(3)^(-)`is isostructural with `XeO_3` since both are pyramidal. |
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| 22700. |
Which gas is obtained by reacting Calcium Phosphide with water ? |
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Answer» Arshine |
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