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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.
| 7951. |
Which statement if wrong regarding osmotic pressure (P), volume (V) and temperature (T) |
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Answer» <P>`P prop (1)/(V)` ID T is constant |
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| 7952. |
Which of the following reactions goes almost all the way to completion, and which proceeds hardly at all ? 2NO(g) + O_(2)(g)hArr2NO_(2) (g) , K_(c) = 6.0 x× 10^(13) |
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Answer» |
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| 7953. |
Which is most stable compound among the following |
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Answer»
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| 7954. |
When an aqueous solution of lithium chloride is electrolysed using graphite electrodes |
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Answer» `Cl_2` is LIBERATED at the anode. |
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| 7955. |
Which one of the following is not used as fertlizer ? |
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Answer» Ammonium nitrate |
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| 7956. |
When acetone undergoes reduction in presence of Zn-HCl/Hg, it is known as |
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Answer» WOLF Kishner's reduction |
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| 7957. |
Thermal decomposition of KC10, in the presence of ........... follows ........... theory. |
| Answer» SOLUTION :`MnO_2` , intermeidatecompoundformation THEORY . | |
| 7958. |
Which of the following strategy is not useful for global warming |
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Answer» Use of FOSSIL fuel in limit |
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| 7959. |
Which of the following is the correct order for strength of C - X bond. |
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Answer» `CH_(3)F gt CH_(3)CL gt CH_(3)Br gt CH_(3)L` |
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| 7960. |
Which of the following is an example of liquid dishwashing detergent? |
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Answer» `CH_3(CH_2)_(10)-CH_2C_6H_4OSO_3^(-) Na^(+)` <BR> |
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| 7961. |
The compound formed on heating chlorobenzene with chloral in the presence of concentrated sulphuric acid, is: |
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Answer» FREON |
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| 7962. |
What is meant by degree of polymerization ? |
| Answer» Solution :The number of REPEATING units of MONOMERS in a CHAIN of a polymer is called its DEGREE of polymerization. | |
| 7963. |
Welding of magnesium can be done in an atmosphere of: |
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Answer» `O_2` |
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| 7964. |
What is the minimum energy of photons which causes photoelectric effect with platinum metal? The threshold frequency of the metal platinum is 1.3xx1015s^(-1). |
| Answer» SOLUTION :`8.3xx10^(-19)J` | |
| 7965. |
Which hydrocarbon will be most stable |
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Answer» Methane |
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| 7966. |
Which of the following result the chemist must have observed about his studies with KCl solution ? |
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Answer» Dilute KCL SOLUTION shows no adsorption whereas CONCENTRATED KCl shows adsorption. |
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| 7967. |
While testing borate, green edged flame is due so formation of (a) _____. |
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Answer» |
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| 7968. |
When a hydrocarbon (A) is treated with Br_(2) gives (B). The compound (B) is treated with Na metal in ether gives 2,3- dimethyl butane. The compound (A) is |
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Answer» `CH_(3)-CH_(3)` `2CH_(3)Br+2Na overset("dry ether") to C_(2)H_(6)+2NaBr` ETHANE is thehydrocarbon which contain less than foun carbon atoms. |
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| 7969. |
Unlike phenol , 2,4-dinitrophenol is soluble in sodium carbonate solution in water because |
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Answer» presence of two- `NO_(2)` GROUPS in the ring makes 2,4- dinitrophenol a stronger ACID than PHENOL |
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| 7970. |
The real vapour pressure for non ideal solution is …….. Than by Raoult's law. |
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Answer» more |
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| 7971. |
underset (("solid"))(HgI_(2))+underset((aq))(2KI)rarrK_(2)underset((aq))([Hg_(4)])(100%) yield) If exactly sufficient HgI_(2) solid is dissoved in an aqueous potassium iodide solution , which of the following may be observed ? (allsubstances are completely ionised) |
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Answer» The elivation BOILING POINT of water in THESOLUTION drops by `25%` |
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| 7972. |
Which of the following has both Schottky and Frenkel defects. |
| Answer» ANSWER :A | |
| 7973. |
What are the applications of colloids. |
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Answer» Solution :Collodion is used to reduced pore SIZE of filter paper to get ultra-filters. (ii) Alum is added to coagulate suspended impurities so as to purify drinking WATER. (iii) Colloidal antimony is used in curing kalazar (disease caused by mosquito bite). (IV) Argyrol is used as eye lotion. (v) Milk of MAGNESIUM is used as antacid. (vi) Animal hides are colloidal in nature and are positively charged. When it is soaked in tannin which contains negatively charged colloidal particles, mutual takes place. This result in turning of leather or hardening of leather. `K_2Cr_2O_7` is used for tanning of leather asitis and oxdizing agent. |
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| 7974. |
When an aqueous solution of lithium chloride is electrolysesd using graphite electrodes : |
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Answer» pH of the RESULTING solution increases |
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| 7975. |
The total number of alkyl groups having the molecular formula (c) C_(3)H_(7) (b) C_(4)H_(9) (c) C_(5)H_(11) are. |
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Answer» |
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| 7976. |
The surface tension of water at 21°C is 72.75 xx 10^(3) Nm^(-1). A 33.24% (vol./vol.) solution of ethanol has y = 33.24 xx 10^(-3) Nm^(-1)at the same temperature. Given density (solution) = 0.9614 xx 10^3 kg m^(-3)and density (water) = 0.9982 xx 10^3 kg m^(-3). How much less will the alcohol solution rise in the same capillary? Angle of contact, theta = 0^(@) |
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Answer» Solution :We have, `gamma = (hdrg)/2` As the same capillary is used for both ETHANOL and water, r and g are the same in both. `THEREFORE h_(1)/h_(2) = (gamma_(1).d_(2))/(gamma_(2).d_(1))` .1. and .2. stand for ethanol and water RESPECTIVELY. `h_(1)/h_(2) = ((33.24 xx 10^(-3)) xx 0.9982 xx 10^(3))/((72.75 xx 10^(-3)) xx 0.9614 xx 10^(3)) = 0.474` Thus, ethanol will rise only 47.4% as FAR as pure water. |
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| 7977. |
The specific optical rotations of pure a- and b-D-mannopyranose are + 29.3° and -17.0, respectively. When either form is dissolved in water, specific optical rotation of the equilibrium mixture is found to be + 14.2°. Calculate the percentage of a anomer at equilibrium. |
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Answer» `THEREFORE` Fraction of b-anomer =(1-x) Hence, `x(+29.3^(@)) + (1-x)(-17.0^(@))=+14.2^(@)` `29.3^(@)x + 17^(@)x = 14.2^(@) + 17^(@)` x=0.67 `therefore` Fraction of a-anomer = 0.67 or 67% |
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| 7978. |
Which of the following element possess highest metallic properties ? |
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Answer» P |
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| 7979. |
Which is the reagent whose reaction with glucose indicates the presence of Carbonyl group in it ? |
| Answer» Solution :`NH_(2)OH` | |
| 7980. |
When NH_(4)Cl is added to a solution of NH_(4)OH, |
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Answer» The dissociation of `NH_(4)OH` INCREASES |
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| 7981. |
Using Raoult's law, explain how the total vapour pressure over the solution is related to molefraction of components in the following solutions :(i) CHCl_3 (l) " and " CH_2Cl_2(l)(ii) NaCl (s) " and " H_2O (l) |
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Answer» Solution : (i) For a binary solution having both components as volatile liquids, the total PRESSURE will be `p = x_1p_1^0 + x_2p_2^0` `= x_1p_1^0 + (1-x)p_2^0` `= (p_1^0 - p_2^0) x_1 + p_2^0` p=total vapour pressure `p_1` = partial vapour pressure of COMPONENT 1 (SAY `CHCl_3`) ` P_2` = partial vapour pressure of component 2 (say `CH_2Cl_2`) `x_2` = mole FRACTION of `CHCl_3` (ii)For a solution containing non-volatile SOLUTE, the Raoult.s law is applicable only to vaporisable component (1) and total vapour pressure is written as `p = x_1p_1^0` |
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| 7982. |
Which is more stable PCl_(5) or PCl_(3) ? Or What happens when PCl_(5) is heated ? |
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Answer» Solution :`PCl_(3)` is more stable than `PCl_(5)` because on heating `PCl_(5)` decomposes to form `PCl_(3) and Cl_(2)` `PCl_(5) OVERSET(Delta)rarr PCl_(3) + Cl_(2)` |
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| 7984. |
Which of the following is a composition of bleaching powder ? |
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Answer» `CA(OCL)_(2).CaCl_(2) .Ca(OH)_(2).2H_(2)O` |
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| 7985. |
Which compound in each of the following pairs will react faster in S_(N)2 reaction with OH^(-)? (a) CH_(3)Br or CH_(3)I (b) CH_(2)=CHBr or CH_(2)=CHCH_(2)Br. |
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Answer» Solution :(a) Since `I^(-)` ion is a better leaving group than `Br^(-)` ion, therefore, iodidies are more reactive than bromides. In other words, `CH_(3)I` is more reactive than `CH_(3)Br`. (b) Reactiviity in `S_(N)2` reactions among other things DEPENDS upon the magnitude of the +ve charge on the carbon atom carrying the halogen. now the `sp^(2)`-carbon atom of the `CH_(2)` group carrrying the Br atom in `CH_(2)=CHCH_(2)Br` carries more +ve charge due to -I-effect of the Br atom and the `CH_(2)=CH`- group as COMPARED to `sp^(2)`-carbon atom of `CH` group in `CH_(2)=CHBr` due to electron-donating RESONANCE effect.  As a result, `CH_(2)=CHCH_(2)Br` will react faster than `CH_(2)=CHBr` with `OH^(-)` ions. |
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| 7986. |
Why a drug should not be taken without consulting a doctor ? Give two reasons. |
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Answer» SOLUTION :(i) To avoid side effects CAUSED by drug. (II) To have the ADVICE for proper DOSE of drug. |
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| 7987. |
Which of the following is not the true about crystalline solids |
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Answer» they are RIGID and hard |
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| 7988. |
Z is: |
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Answer»
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| 7989. |
Which of the following is not a cellulose product, |
| Answer» Answer :D | |
| 7991. |
The structure of a basic amino acid, lysine, is given below: (HOOC-underset(.^(o+)NH_(3))underset(|)(C)H-(CH_(2))_(3)-CH_(2)overset(o+)(N)H_(3))(A) The pK_(a_1),pK_(a_2), and PK_(a_3) of (A), respectively, are: 2.18,8.95, and 10.53. What is the pH at isoelectric points (pI)? |
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Answer» `(pK_(a_(1))+pK_(a_(2)))/(2)` |
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| 7992. |
Which of the following statement is/are correct for gas (D) ? (I)it has the state of hydridisation sp^(3) (II)Gas can be identified by CaCI_(2) solution (III)Gas can be identified by Pb(OAc)_(2) solution (IV)Gas can be identified by passingthrough solution |
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Answer» I,IV |
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| 7993. |
What happens whenD-glucoseis treatedwith thefollowingreagents ? (i) HI (ii) Brominewater (iii) HNO_(3) |
Answer» SOLUTION :(i)` UNDERSET("D - Glucose")underset(CH_(2)OH)underset(|)overset(CHO)overset(|)((CHOH)_(4))+ HI to CH_(3) - CH_(2) - CH_(2) - CH_(2) - CH_(3)`
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| 7994. |
Which of the following have maximum electronegativity |
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Answer» Al |
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| 7995. |
Which of the following are polar protic solvents |
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Answer» Water |
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| 7996. |
The solubility of a solid in H_(2)O at different temperatures is indicated in the accompying diagram. What mass of the solid will crystallize when 40mL of a solution that is saturated at 80^(@)C is cooled to 20^(@)C? |
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Answer» 12g |
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| 7997. |
Write the role of (a) Dilute NaCN in the extraction of gold. (b) CO in the extraction of Iron. |
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Answer» SOLUTION :Dilute NACN is used as a leaching agent. (b) CO is used as a REDUCING agent |
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| 7998. |
Which of the following statements about the assembly of nucleotides in a molecule of deoxyribonucleic acid is correct? |
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Answer» A PENTOSE of one unit CONNECTS to a pentose of another |
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| 7999. |
What is the primary structural feature necessary for a molecule to make it useful in a condensation polymerization reaction ? |
| Answer» Solution :The MONOMER molecule must be bifunctional, i.e., it must have two FUNCTIONAL GROUPS , For example , CAPROLACTAM. | |
| 8000. |
Which of the following statements about the interstitial compounds is incorrect? |
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Answer» They are much harder than the PURE metal |
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