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InterviewSolution
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.
| 9651. |
Which of the following diacid readily gives anhybride on heating ? |
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Answer» Fumaric acid 
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| 9652. |
When bleaching powder is dissolved in hot water, the ions produced are |
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Answer» `CA^(+2), Cl^(-), CLO^(-)` |
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| 9653. |
What do you understand by The two strands of DNA are complementary to each other ? Explain . |
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Answer» Solution :Structure of DNA : To understand the structure of DNA , we should known the charagaff's rule , which states that : 1. Base composition on DNA for a PARTICULAR organism is constant throughout all the somatic cells 2. Base composition always varies from one organism to another and is expressed by the dissymmetry ratio , `(A+T)/(G+C)` 3. Organisms closely related to ech other often have similar base composition and hence have closed values for their dissymmetry ratio. 4. In a given organism the amount of adenine is always equal to the amount of thymine (A=T) and amount of guanine is equal to amount of cytosine (G=C). 5. In a given organism the TOTAL amount of purine bases are always equal to total numberof pyrimidine bases (i.e.,) (A+G=T+C). M. wilkins found that within the crystal there is a repeat DISTANCE of 3.4 nm and there are ten subunits per turn. watson - Crick model for DNA : From the above observations watson and crick constructed a model for DNA. This model consists of two right handed polynucleotide chains that are complimentary and coiled about the same axis to form double - helix .Some specific base pairs can be SPATIALLY accommodated and these are A-T and G-C pairs. The bases are closely ASSOCIATED with each other by hydrogen bonding. The helix has diameter of about 2.0 nm and contains 10 nucleotide pairs in each turn of helix as shown above: 
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| 9654. |
The varation of compressibility factor Z fora real gas with pressure at different temperatures T_(1), T_(2) and T_(3) is given as follows: Which of the following statements are wrong? |
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Answer» `T_(1)=250 K, T_(2)=600 K and T_(3)=1100 K` |
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| 9656. |
What does the designation '6, 6 mean in the name nylon 6, 6? |
| Answer» Solution :The ACID and amine parts, which CONDENSE to GIVE the polymer both contain 6 CARBONS each. | |
| 9657. |
Which of the following has largest ONO bond ? |
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Answer» `NO_(2)` |
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| 9658. |
What are drugs? How are they classified. |
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Answer» |
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| 9659. |
Whichof the following isomers has a high meltingpoint, high densityandhigh tensile strength ? |
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Answer» Amylopection |
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| 9660. |
Which of the following is not protein? |
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Answer» WOOL |
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| 9661. |
Which of the following curve represents the variation of lamda_(m) with sqrt(C) for AgNO_(3)? |
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Answer»
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| 9662. |
Which statement is incorrect : |
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Answer» `[Fe(CO)_(5)]` reacts with `Br_(2).Cl_(2)` |
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| 9663. |
What are the products formed in the following reaction : C_6H_5-COO-CH_3overset(1.LiAlH_4)underset(2.H_3O^+)rarr |
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Answer» `C_6H_5-CH_2-OH`and `CH_3-OH` |
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| 9664. |
Which of the following structures represents a colourless substance |
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Answer» `C_(6)H_(5) - N = UNDERSET(O)underset(|)(N) - C_(6)H_(5)` |
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| 9665. |
What are the limitations of Ellingham diagram? |
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Answer» Solution :The limitations are listed as under : 1. The graph SIMPLY indicates whether a reaction is possible or not because it is based on thermodynamic CONCEPTS. It does not say anything about the kinetics of the reduction process. 2. The interpretation of `triangleG` is based on `K[triangleG= - RT ln K]`. Thus it is presumed that the reactants and products are in equilibrium. `M_(x)O+A_("red") harr xM+AO_("ox")` This is not ALWAYS true because the reactant/product may be solid. However, it explains how the reactions are sluggish when every species is in solid state and smooth when the ore melts down. It is interesting to note here that `triangleH" and "triangleS` values for any rection remain nearly constant even on varying temperatures. |
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| 9666. |
What happens when ethyl alcohol is treated with HI and red phosphorous ? |
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Answer» Solution :ETHYL ALCOHOL is reduced to ethane when treated with HI and RED phosphorous. `C_2H_5OH + 2HIoverset("red P")(RARR)C_2H_6 + I_6 + H_2O` |
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| 9667. |
Which of the following is more acidic and why ? |
| Answer» SOLUTION :` (##KSV_CHM_ORG_P2_C15_E01_182_S01.png" WIDTH="80%"> | |
| 9668. |
When Al_2O_3 is reacted with aqueous solution of HCl gives..........complex. |
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Answer» `[AlCH_(2)O_(2)]^(2+)` |
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| 9669. |
Which of the following has highest bond enthalpy ? |
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Answer» `CH_(3)-F`<BR>`CH_(3)-CL` |
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| 9670. |
Two gases A and B having the same volume, diffuse through a porous partition in 20 and 10seconds respectively. The molecular mass of A is 49 u.Molecular mass ofB will be |
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Answer» 50.00 u ` t_(B)/t_(A) =sqrt(M_(B)/M_(A)) Rightarrow10/20 = sqrt(M_(B)/49) Rightarrow(10/20)^(2) = M_(B)/49` ` 100/400= M_(B)/49 Rightarrow= M_(B) = ( 49 XX 100)/400 =12.25 u` |
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| 9671. |
Which one of the following pair can consume same amount of acetyl chloride ? |
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Answer» ACETYL ethyl AMINE and ethyl amine |
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| 9672. |
Which of the following are used a antiseptis ? |
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Answer» DETTOL and BITHIONAL |
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| 9673. |
Which has minimum reactivity towards nucleophiles : |
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Answer» Methanal |
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| 9675. |
What is the main product of ustard oil reaction? |
Answer» SOLUTION :The main product of mustard OIL reaction is alkylisothiocyanate having CHARACTERISTIC SMELL of mustard oil. 
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| 9676. |
What products will be formed on reaction of propanal with 2-methylpropanal in the presence of NaOH? Write the name of the reaction also. |
Answer» SOLUTION : The REACTION is KOW as CROSS ALDOL reaction. |
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| 9677. |
Which of the following statements about the composition of the vapour over an ideal 1:1 molar mixture of benzene and toluene is correct at 25^(@)C (Given vapour pressure data at 25^(@)C, benzene = "12.8 kPa, toluene = 3.85 kPa") |
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Answer» The vapour will contain equal amounts of benzene and toluene `P_("Toluene")=x_("Toluene")xxP_("Toluene")^(@)` For an ideal `1:1` mixture of benzene and toluene `x_("Benzene")=(1)/(2),x_("Toluene")=(1)/(2)` `P_("Benzene")=(1)/(2)xxP_("Benzene")^(@)=(1)/(2)xx12.8"k PA = 6.4 k Pa"` `P_("Toluene")=(1)/(2)xxP_("Toluene")^(@)=(1)/(2)xx3.85" k Pa = 1.925 k Pa"` Thus, the vapour will contain higher percentage of benzene as the partial vapour pressure of benzene is higher than that of toluene. |
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| 9678. |
Which statement among following are correct? |
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Answer» Hydration effect stabilise dimethyl ammonium ion more than trimethly ammonium ion |
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| 9679. |
Which one has the highest percentage of nitrogen? |
| Answer» Answer :A | |
| 9680. |
Why are the transition elements called so ? |
| Answer» SOLUTION :TRANSITION ELEMENTS are so CALLED because their PROPERTIES are in between those of s-block and p-block elements. | |
| 9681. |
What are antiseptics ? Give an example. |
| Answer» Solution :Chemicals which PREVENT the growth of microorganisms WITHOUT affecting living tissues are called ANTISEPTICS. For example, 0.2% solution of phenol. | |
| 9682. |
What would be the product formed during the reaction? underset"(Glucose)"(C_6H_12O_6) underset((ii)H_2O (iii)HI)overset((i)HCN)to |
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Answer» Hexanoic ACID 
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| 9683. |
What is meant by chirality of a compound? Give an example |
| Answer» SOLUTION :The COMPOUND which is non-superimposable on its MIRROR IMAGE is known as CHIRAL compound and this property is called chirality. | |
| 9684. |
Which of the following is/are protic solvents |
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Answer» `HCOOH` |
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| 9685. |
What relative proportions of ethylene glycol C_2H_6O_2and water (by weight) shouldbe mixed to form an antifreeze solution that will not start to freeze until the temperature reaches - 37^@C? K_f for H_2O = 1.86. |
| Answer» SOLUTION :1.23 : 1 | |
| 9686. |
Which of the following alkaloid is an intense poison and is used to silate the pupil of the eye in ophthalmic examination ? |
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Answer» Caffeine |
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| 9687. |
What are hydrate isomers ? Explain with an example. |
Answer» Solution :The exchange of FREE solvent molecules such as water, ammonia, alcohol etc.in the CRYSTAL lattice with a ligand in the COORDINATION entity will give DIFFERENT isomers. These type of isomers are called solvate isomers. If the solvent MOLECULE is water, then these isomers are called hydrate isomers. for example, the complex with chemical formula `CrCl_(3).6H_(2)O` has three hydrate isomers as shown below. 
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| 9688. |
What is Fehling's solution? |
| Answer» Solution :Alkaline solution of `CuSO_(4)` containing Rochelle salt is called Fehling's solution. It is obtained by ADDIG an alkaline solution of Rochelle salt (sodium potassium tartrate) called Fehling solution 'B' to an aqueous solution of `CuSO_(4)` called Fehling solution 'A' until blue ppt. of `Cu(OH)_(2)` first formed redissolve to FORM a DEEP blue solution. | |
| 9689. |
Which of the following compounds will be most easily attacked by an electrophile ? |
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Answer»
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| 9690. |
Which one of the following is used to distinguish Natural honey and artificial honey? |
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Answer» AMMONIACAL `AgNO_(3)` |
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| 9691. |
Which of the following statements is correct when SO_(2) is passed through acidified K_(2)Cr_(2)O_(7) solution ? |
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Answer» `SO_(2)` is reduced |
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| 9693. |
What is the critical radius ratio for the CsCl structure? |
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Answer» |
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| 9694. |
The solubility product of a sparingly soluble salt AB at room temperature is 1.21xx10^(-6)M^(2). Its molar solubility is : |
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Answer» `1.21xx10^(-6)M` Let its molar solubility be s `[A^(+)]=s [B^(+)]=s` `K_(sp)=[A^(+)][B^(-)]=s xx s` `1.21xx 10^(-6)=s^(2)` or `s=1.1xx10^(-3)M` |
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| 9695. |
Which of the following aqueous solution has maximum conductivity ? |
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Answer» 0.01 M difluoracetic acid |
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| 9696. |
Which of the following statement(s) is/are correct about SF_(4) molecule? |
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Answer» it has a square planar shape with S-atom having two lone pairs |
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| 9697. |
Which of the following is used to make bullet proof windows ? |
| Answer» Answer :B | |
| 9698. |
Which of the following species used both axial set of d-orbitals in hybridisation of central atom ? |
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Answer» `PBr_(4)^(+)` |
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| 9699. |
Which of the following benefaction process is used for the mineral Al_(2)O_(3)2H_(2)O? |
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Answer» Froth-floatation |
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| 9700. |
Which of the following will not give silver mirror , when treated with Tollen's reagent |
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Answer» ETHANAL |
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