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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.
| 21651. |
Which one of the following nitro compounds does not react with nitrous acid |
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Answer» `CH_3-CH_2-CH_2-NO_2` |
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| 21652. |
Which of the following square planar complexes has two geometrical isomers ? |
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Answer» `MA_(4)` |
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| 21653. |
total number of isomeric alcohols (excluding stereoisomerism) with formula C_5H_12O is |
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Answer» 5 |
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| 21654. |
Which of the following carboxylic acids is most reactive towards esterification? |
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Answer» `(CH_(3))_(3)"CC"OOH` |
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| 21655. |
Vitamin C is chemically known as : |
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Answer» Tartaric ACID |
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| 21656. |
The value of rate constant of a pseudo first order reaction _________. |
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Answer» Independent on the concentration of reactants present in SMALL amount |
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| 21657. |
Write IUPAC names of the following : [Pt(NH_(3))_(6)]Cl_(4) |
| Answer» SOLUTION :HEXAAMMINEPLATINUM(IV) CHLORIDE. | |
| 21658. |
Which forces are involved in holding the drugs to the active site of enzymes ? |
| Answer» Solution :One or more of hydrogen BONDING, ionic bonding, dipole-dipole interactions and van DER Waals. interactions are involved in binding the DRUGS to ACTIVE SITE. | |
| 21659. |
Which one of the following pairs is mismatched |
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Answer» Fossil fuel BURNING - release of `CO_2` |
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| 21660. |
Write two differences between physisorption and chemisorption. |
Answer» SOLUTION :
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| 21662. |
The vapour pressure of a dilute solution of a solute is NOT influenced by |
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Answer» temperature of SOLUTION |
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| 21663. |
Which of the following is incorrect order ? |
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Answer» `CH_(3)^(-) gt CH_(3)O^(-) gt HO^(-) gt H_(2)O` ( Nucleophilicity in protic solvent ) |
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| 21664. |
Which of the following is not a thermoset: |
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Answer» Glyptals |
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| 21665. |
Which one is a 1^(@) carbocation of the following |
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Answer» `CH_(3)OVERSET(+)(C)H_(2)` |
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| 21666. |
To prepare solution of certain substance, 300 gm is used for 25% solution and 400 gm for 40% solution, then what is the mass percentage of solute present in this solution mixture ? |
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Answer» `33.57` In solution - 2, mass of solute `=(40)/(100)xx400=160` gm So, total mass of solute on MIXING two solution is= 235 gm So, total mass of solution = 700 gm So, % solute PRESENT in final solution `= (235)/(700)xx100=33.57%` |
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| 21667. |
Which compound will not give the Tollen's test ? |
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Answer»
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| 21668. |
Which of the following statementsis correct for covalent bonds |
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Answer» Electrons are shared between TWO atoms |
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| 21669. |
The relative acidities of various organic compounds are ..... |
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Answer» `RCOOH GT ArOH gt H_2O gt ROH gt RC -= CH` |
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| 21670. |
Whichof the followingis most acidic |
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Answer» `CH_(3) CHCH= CH_(2)` |
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| 21671. |
Which of the aldehyde is most reactive |
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Answer» `C_(6)H_(5)-CHO` |
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| 21672. |
Use the relationship DeltaG^@= -nF E_(cell)^@ to estimate the minimum voltage required to electrolyse Al_2O_3 in the Half-Heroult process. DeltaG_f^@(Al_2O_3)= -1520 kJ mol^(-1) , DeltaG_f^@(CO_2)= -394 kJ mol^(-1) Show that the oxidation of the graphite anode to CO_2 permits the electrolysis to occur at a lower voltage than if the electrolysis reactions were Al_2O_3to2Al+3O_2 |
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Answer» Net reaction in Hall-Heroult process is : `3C+2Al_2O_3 to 4Al +3CO_2` or `4Al^(3+)12E^(-)to 4Al`, number of electrons (n)=12 `DeltaG^@ =3 DeltaG_f^@(CO_2)-2DeltaG_f^@(Al_2O_3)` `=3xx394-2(-1520)=1858 kJ` `DeltaG^@=-nFE_(cell)^@` ltbgt `-E_(cell)^@=(DeltaG^@)/(nF)=(1858xx1000)/(12xx96500)=1.60 V` For the reaction `Al_2O_3 to 2Al+3O_2` `DeltaG^@=`1520 kJ `2Al^(3+)+6e^(-)to2Al, n=6` `-E_(cell)^@=(DeltaG)/(nF)=(1520xx1000)/(6xx96500)=2.62` V Thus Hall-Heroult process takes place at lower voltage. |
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| 21673. |
Write the structures of the major organic product in each of the following: (CH_3)_3CBr + KOH underset("heat")overset("ethanol")(rarr). |
| Answer» SOLUTION :`CH_3-UNDERSET(CH_3)underset(|)(C )=CH_2` | |
| 21674. |
Which of the following will show geometrical isomerism : |
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Answer»
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| 21675. |
The solubility product of a salt having the formula M_(2)X_(2) is 1xx10^(-20). If the solubility of another salt having formula M_(2)X is twice the molar solubility of M_(2)X_(2), the solubility product of M_(2)X is:- |
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Answer» `32xx10^(-12)` |
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| 21676. |
Which out of gold sol and gelatin in water sol is a lyophilic sol? |
| Answer» SOLUTION :GELATIN in WATER | |
| 21678. |
Which is correct for 18 crown-6 |
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Answer» it has FORMULA `C_12H_24O_6` |
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| 21679. |
Which of the following is a primary halide? |
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Answer» ISOPROPYL iodide |
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| 21680. |
X is |
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Answer»
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| 21681. |
Which of the following combination gives homocyclic unsaturated product ? |
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Answer» (II)(ii)(S) 
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| 21682. |
To purify fluorine gas, fumes of HF are removed by |
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Answer» SOLID NaF |
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| 21683. |
Which among the following phenolic compounds is most acidic in nature? |
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Answer» p-aminophenol |
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| 21684. |
Which among the following solutions is NOT used in determination of the cell constant? |
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Answer» `10^(-2)` M KCl |
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| 21685. |
Under which of the following reaction conditions, aniline gives p-nitro derivative as the major product? |
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Answer» Acetyl chloride/pyridine followed by reaction with conc. `H_(2)SO_($)+conc.HNO_(3)`  (c) `C_(6)H_(5)NH_(2)overset(Dil.HCl)to C_(6)H_(5) overset(+)(N)H_(3)underset(+conc.H_(2)SO_(4))overset(conc.HNO_(3))tom-NO_(2)-C_(6)H_(4)-overset(+)(N)H_(3)` (d) With conc. `HNO_(3)+conc.H_(2)SO_(4)`, aniline is oxidised to form tarry products. thus, options (a) and (B) are correct. |
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| 21686. |
Which one of the following is used to reduce fever and prevent platelet coagulation? |
| Answer» Solution :antipyretic | |
| 21687. |
What is the cause of a feeling of a depression in human beings? Name a drug which can be useful in treating depression. |
| Answer» Solution :Low level of NORADRENALINE is RESPONSIBLE for the FEELING of depression in HUMAN beings. An important antidepressant drug is ipronizid. | |
| 21688. |
What are antibiotics? |
| Answer» SOLUTION :Antibiotics is a chemical SUBSTANCE PRODUCED by one microorganism, that SELECTIVELY inhibits the GROWTH of another micro organism. Example : penicillins and cephalosporins. | |
| 21689. |
There are some deposits of nitrates and phosphates in earth's crust. Nitrates are more soluble in water. Nitrates are difficult to reduce under the laboratory conditions but microbes do it easily. Ammonia forms large number of complexes with transition metal ions. Hybridizatioin easily explains the ease of sigma donation capability of NH_(3) and PH_(3). Phosphine is a flammable gas and is prepared from white phosphorus. Among the following, the correct statement is |
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Answer» Between `NH_(3)` and `PH_(3),NH_(3)` is a better electron donor because the Ione PAIR of electrons occupies spherical s orbital and is LESS directional |
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| 21690. |
Which of the following ions does not have S-S linkage ? |
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Answer» `S_2O_8^(2-)` |
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| 21691. |
What is the effect of temerature on molarity of a solution? |
| Answer» Solution :Molarity DECREASES because volume of the solution INCREASES with increase in temperature but no. of MOLES of SOLUTE remains the same (assuming it to be non-volatile). | |
| 21692. |
Treatement of propionaldehyde with dilute NaOH solution gives |
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Answer» `CH_(3)CH_(2)COOCH_(2)CH_(2)CH_(3)` |
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| 21693. |
Write the products obtained when benzyl phenol ether is heated with HI. |
Answer» Solution :Protonation of benzyl phenol ether gives oxononium ion in which `O-C_(6)H_(5)` has some DOUBLE bond character due to resonance between the lone pairs of electrons on the oxygen ATOM and the `sp^(2)`-hydridized carbon of the PHENYL ring. Therefore, attack by `I^(-)` ion EXCLUSIVELY breaks the weaker `O-CH_(2)C_(6)H_(5)` bond FORMING phenol and benzyl iodide.  .
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| 21694. |
Which of the following are anionic detergents? |
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Answer» SODIUM salts of sulphonated long chain alcohol 1. Anionic detergents These are sodium salts of sulphonated long chain alcohol or hydrocarbons.  2. Cationic detergents These are quartemary ammoium salts of amines with acetates chlorides or bromides an anion e.g.,  3. Non-ionic detergents it is formed by the reaction of stearic acid with polyethylene glycoi. 
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| 21695. |
What happens when BaCl_2 is added to Fe(OH)_3 sol? |
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Answer» |
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| 21696. |
Which of the following compound has the lowest melting point ? |
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Answer» `CaCl_(2)` `CaF_(2)gtCaCl_(2)gtCaBr_(2)gtCaI_(2)` |
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| 21697. |
What is a 'soap' ? How is it prepared ? |
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Answer» SOLUTION :Soaps : Soaps are generally mixtures of sodium and potassium salt of higher fatty acids such as stearic, palmitic and oleic acids. For effective cleansing action of soap, its fatty acid unit must CONTAINS 12 to 18 carbon atoms. Soaps with less than 12 carbaon fatty acids are COMPARATIVELY soluble in water whereas soaps containing more than 22 carbon atoms are not useful because of their insolubility in water. Sodium soaps are hard whereas potassium soaps are soft, PREPARATION : Shaving creams, shampoos etc., are mostly potassium soaps. Soaps are usually obtained by the hydrolysis of oils and fats with sodium or potassium hydroxide.  Transparant soaps are prepared by dissolving ordinary soaps in alcohol and then removing the insoluble part by filtration. The solid transparent mass is obtained on evaporating off alcohol. |
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| 21698. |
Which of the following is employed as antihistamine ? |
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Answer» Omeprazole |
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| 21699. |
The tampering of steel makes it: |
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Answer» Hard |
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| 21700. |
What are ambident nucleophiles ? Explain with an example. |
| Answer» SOLUTION :Ambident NUCLEOPHILES are the species which have two NUCLEOPHILIC centres. For example, `CN^(ʘ)("":overset(ʘ)C-=N:"")` which can attack either from carbon or NITROGEN. Actually CYANIDE ion is a resonance hybrid of two contributing structures `("":overset(ʘ)C-=N to :C=N^(ʘ))` can act as a nucleophile in two different ways, i.e., linking through carbon atom forming alkyl cyanides and through nitrogen atom forining isocyanide. | |
