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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.
| 20551. |
What is the weight in pounds of a gold bar 12.0 inches long, 6.00 inches wide and 3.00 inches thick? The density of gold is 19.3gcm^(-3). Given 1 inch = 2.54 cm, 1lb = 453.6 g. |
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Answer» `=150.60491 lb=151lb` (after ROUNDING off because least PRECISE term has 3 SIGNIFICANT figures) |
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| 20552. |
Two flasks A and B having capacity 1L and 2L respecitvely contain one mole of a gas each. If the temperatrue of the flasks are so adjustedthat the average velocity of molecules in A is twice that of molecules in B, the pressure of A is : |
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Answer» HALF that in B `PV = 1//3 m MU^(2)` For gas in flask A, `P_(A) = ( 1)/( 3). ( m_(A) mu_(A)^(2))/(V_(A))` For gas in flask B, `p_(A) = ( 1)/( 3) . ( m_(B) mu _(B)^(2))/( V_(B))` For one MOLE of each gas `m_(A) = m_(B)` `:. ( p_(A))/( p_(B)) = ( mu_(A^(2)))/(mu_(B^(2)) )xx( V_(B))/(V_(A))` `= ( (2)^(2)xx2)/(1 xx (1)^(2)) = 8 ` or `p_(A) = 8 p_(B)` |
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| 20553. |
Which is not true in case of H_2O_2 ? |
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Answer» It is more stable in basic solution |
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| 20554. |
Which of the following is the IUPAC name of K_(4)[Fe(CN)_(6)] ? |
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Answer» POTASSIUM fenicyanide |
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| 20555. |
Which substance is used in the laboratory for a fast drying of neutral gases ? |
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Answer» PHOSPHORUS pentoxide |
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| 20556. |
The sum of the power to which the concentration of substance appears in the rate expression is known as: |
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Answer» RATE of reaction |
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| 20557. |
What is the coordination number of (i) sodium in sodium oxide (Na_2O)? (ii) oxide ion in sodium oxide (Na_2O)? (iii) calcium in calcium fluoride (CaF_2)? (iv) zinc in zinc blende (ZnS)? |
| Answer» Solution :(i) 4 (II) 8 (iii) 8 (iv) 4 | |
| 20559. |
Which of the following has highest affinity for hydrogen: |
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Answer» `F_2` |
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| 20560. |
Which polymer is used in preparation of orthopedic devices ? |
| Answer» SOLUTION :PHBV | |
| 20561. |
What are the hydrolysis products of glyceryl oleate(C_(17)H_(32)COO)_(3)C_(3)H_(5)during preparation of soap? |
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Answer» `C_(17)H_(32)COONa+C_(3)H_(5)OH` |
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| 20562. |
Through which of the following reaction number of carbon can be increased in the chair ? |
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Answer» GRIGNARD REAGENT |
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| 20563. |
What are antihistamines ? Give two examples. |
| Answer» SOLUTION : The group of compounds which destroy HISTAMINE PRODUCED in the body by ALLERGENS. E.g., BROMOPHENIRAMINE, seldane. | |
| 20564. |
Which of the following is the life saving mixture for an asthma patient |
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Answer» MIXTURE of helium and oxygen |
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| 20565. |
The shortest lambda for the Lyman series is…. (Given R_H=109678 cm^(-1)): |
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Answer» 991`OVERSET@A` |
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| 20566. |
Write the optical isomers cis [PtCl_2)en)_2]^(2+). |
Answer» SOLUTION :
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| 20567. |
Which of the following is not correctly matched :- |
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Answer» `Na_(2)O_(2) lt K_(2) O_(2) lt Rb_(2)O_(2) lt Cs_(2) O_(2) `(Thermal stability order) |
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| 20568. |
Which is neutral to litmus? |
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Answer» ZnO |
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| 20569. |
Which of the following does not take place by alpha-decay |
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Answer» `._(92)U^(238) rarr ._(90)Th^(234)` |
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| 20570. |
Which of the following is an artificial sweetner ? |
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Answer» Sucralose |
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| 20571. |
Write the names of monomers of the following polymers : -[-NH-(CH_(2))_(6)-NH-CO-(CH_(2))_(4)-CO-]-_(n) |
| Answer» SOLUTION :HEXAMETHYLENEDIAMINE and ADIPIC ACID | |
| 20572. |
The starting material for the preparation of CH_3Iin one step reaction is : |
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Answer» `CH_3OH` |
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| 20573. |
Water is a universal solvent. But alcohol also dissolves most of the substances soluble in water. Boiling point of water is 100^(@)C and that of alcohol is 80^(@)C. The specific heat of water is much higher than the specific heat of alcohol. (a) List out three possible differences if instead of water as the liquid in our body we had alcohol. (b)What value can you derive from this special property of water and its innumerable uses insustaining life on earth? |
| Answer» Solution :(a) I.Even a small raise in temperature in the surroundings will raise the temperature of the bodybecause the specific heat of alcohol is much less than the specific heat of water. In order to coolthe body more sweating will take place.II.As there is less H bonding in alcohol it will get evaporated FASTER. The alcohol will be evaporatedat such a fast rate that the liquid has to be ingested always.III.Ice which floats on water helps AQUATIC life to exist even in winter as water insulates the heatfrom liquid below it to go back to the surroundings. Solid alcohol does not have such specialproperties.(b)PRAISE is to the almighty that has so thoughtfully given such SPECIAL properties to water andmade it a liquid that could SUSTAIN life. | |
| 20574. |
Which one of the following is expected to exhibit optical isomerism(en = ethylene diamine) ? |
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Answer» cis-`[PT(NH_(3))_(2)Cl_(2)]` |
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| 20575. |
What is the commonality between the antibiotic arsphenamine and azodye ? |
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Answer» Solution :Arsphenamine is also known as salvarsan. It is synthetic organic areseniccompound that was previously used for treating syphilis. Arsphenamine POSSESS-As=As-linkage. Azo dyes are used to PROMOTE EPITHELIAL growth in the treatment of ULCERS, burns and other wounds. Many azodyes have anticoagulation ACTION. Azo dyes possess - N = N- linkage like arsphenamine which possess-As = As - linkage. 
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| 20576. |
What will be the heat of formation of ethane, in the heat of combustion of carbon is -x kJ ,heat of formation of water is -ykJ , and heat liberated during complete combustion of ethane is zkJ |
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Answer» `(-2x-2y+z)KJ` |
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| 20577. |
Which of the following has longest C-O bond length? (Free C-O bond length in CO is 1.128 Å) |
| Answer» Answer :A | |
| 20578. |
What is the structure and IUPAC name of glycerol ? |
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Answer» SOLUTION :`underset(CH_(2)OH)(underset(|)(underset(CHOH)underset(|)CH_(2)OH))` IUPAC NAME: Propane-1,2,3-triol |
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| 20579. |
Which one of the following find application in proper functioning of our eyes ? |
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Answer» CHOLESTEROL |
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| 20580. |
Which carbon - halogen bond has the lowest bond enthalpy ? |
| Answer» ANSWER :D | |
| 20582. |
Which are called methanides? |
| Answer» Solution :The CARBIDES CONTAINING `C^(4-)` ions are called methanides | |
| 20583. |
Which one of the following sets correctly represents the increase in the paramagnetic property of the ions ? |
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Answer» `Cu^(2+)LTV^(2+)ltCr^(2+)LTMN^(2+)` |
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| 20584. |
Which one is the class for allergy ? |
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Answer» Antacids |
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| 20585. |
When one ampere current is passed through a Cu wire for 10 sec., the number of electrons passingthrough it is |
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Answer» `1.6 xx 10^(19)` |
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| 20586. |
Write two side effects of Aspirin. |
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Answer» Solution :(i) It is toxic to LIVER. (II) It also causes BLEEDING from STOMACH SOMETIMES, thus it is a gastric irritant. |
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| 20587. |
The vapoure pressure of ethanol are 44.5 mm and 88.7 mm Hg respectively at the same temmperatureAn ideal solution is formed by mixing 60g of ethanol and 40 gm of methanol. The mole fraction of methanol in the vapoure phases is. |
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Answer» `0.68` |
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| 20588. |
Whichof the followingis notan antibiotic ? |
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Answer» CHLORAMPHENICOL |
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| 20589. |
When a bromide is heated with conc. H_2SO_4 , the gas liberated is : |
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Answer» HBR |
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| 20590. |
Which one of the following is a pentose sugar? |
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Answer» Ribose |
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| 20591. |
When an electric current is passed through acidified water, 112ml of H_2 gas collected at NTP at cathode in 965sec. the current strength is |
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Answer» `1.0` |
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| 20592. |
When is the rate of reaction equal to specific rate ? |
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Answer» Solution :Rate `=k[A]^(a)[B]^(b)` etc. Rate = k when EITHER concentration of each REACTANT is 1 `" MOL L"^(-1)` or order with respect to each reactant is zero, i.e., the REACTION is of zero order. |
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| 20593. |
Which is favourable for homolysis:- |
| Answer» Answer :A | |
| 20594. |
What is the significance of the isoelectric point of a protein? |
| Answer» Solution :At this point, the protein MOLECULE will not migrate in an electric field. At this PH, the protein molecule is easily precipitated. | |
| 20595. |
What happen when boric acids reacts with sodium hydroxide? |
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Answer» SOLUTION :Boric acid reacts with sodium hydroxide to FORM sodium metaborate and sodium tetraborate. (i) `NaOH+H_(3)BO_(3)tounderset(("Sodium metaborate"))(NaBO_(2))+2H_(2)O` (ii) `2NaOH+4H_(3)BO_(3)tounderset(("Sodium tetraborate"))(Na_(2)B_(4)O_(7))+7H_(2)O` |
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| 20596. |
Which graph shows how the energy E of a photon of light is related to its wavelengths (lamda)? |
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Answer»
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| 20597. |
The standard enthalpy of formation (Delta_(f)H^(@)) at 298 K for methane, CH_(4)(g), is –74.8 kJ mol^(-1).The additional information required to determine the average energy for C – H bond formation would be - |
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Answer» latent HEAT of VAPORIZATION of methane |
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| 20598. |
Which one among the following is the correct order of reactivity of the elements ? |
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Answer» `Cu gt Mg gt ZN gt NA` |
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| 20599. |
What are amino acid? Explain essential and non - essential amino acids. |
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Answer» Solution :(i) An amino acid is bifunctional organic MOLECULE that contains both a carboxyl group, - COOH as well as an amine g roup, - `NH_(2)` (ii) Those amino acids that cannot be synthesised by the body and must be supplied in the diet are called essentialamino acids. (III) The amino acids that can be synthesisedfrom other compounds by the TISSUES of the body are called non-essential amino acids. |
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| 20600. |
Two isomeric compounds A and B having molecular formula C_(4)H_(11)N, both lose N_(2) on treatment with HNO_(2) and gives compound C and D, respectively. C is resistant to oxidation but immediately responds to Lucas reagent, whereas 'D' responds to Lucas reagent after 5 minutes and gives a positive iodoform test. Identify A and B. |
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Answer» Solution :The following REACTIONS lead to the identification of A and B : `CH_(3)-underset(underset(underset((B))(NH_(2)))(|))(CH)-CH_(2)-CH_(3)+HNO_(2) rarr CH_(3)-underset(underset(underset((D))(OH))(|))(CH)-CH_(2)-CH_(3)+N_(2)+H_(2)O` `CH_(3)-underset(underset(underset((A))(NH_(2)))(|))overset(overset(CH_(3))(|))(C)-CH_(3)+HNO_(2) rarr CH_(3)-underset(underset(underset((C))(OH))(|))overset(overset(CH_(3))(|))(C)-CH_(3)+N_(2)+H_(2)O` `CH_(3)-underset(underset(underset((C))(OH))(|))overset(overset(CH_(3))(|))(C)-CH_(3)+conc.HCl overset(ZnCl_(2)(Anhyd.))(rarr)CH_(3)-underset(underset(Cl)(|))overset(overset(CH_(3))(|))(C)-CH_(3)+H_(2)O` .C. is resistant to oxidation because tertiary alcohols do not undergo oxidation. It gives turbidity immediately with LUCAS reagent. .D. responds to Lucas reagent test within 5 MINUTES because it is secondary alcohol and turbidity appears after 5 minutes. `CH_(3)-underset(underset(underset("Butan-2-ol")(OH))(|))(CH)-CH_(2)-CH_(3)+underset(conc)(HCl) overset(ZnCl_(2)(Anhyd.))(rarr)CH_(3)-underset(underset(underset("2-Chlorobutane")(Cl))(|))(CH)-CH_(2)-CH_(3)` `CH_(3)-underset(underset(underset("(D)Butan-2-ol")(OH))(|))(CH)-CH_(2)-CH_(3) underset((NaOI))overset(I_(2)//NaOH)(rarr)CH_(3)-underset(underset(underset("2-Butanone")(O))(||))(C)-CH_(2)-CH_(3) overset(I_(2)//NaOH)(rarr)underset("Iodoform")(CHI_(3))+underset("Sodium propanoate")(CH_(3)CH_(2)COONa)+3NaI+2H_(2)O` |
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