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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.
| 18051. |
Which one of the following isomeric structures has the lowest energy ? |
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| 18052. |
When two compounds Acl_(3) and DCl_(3) of two elements A and D are mixed together a compound ADCl_(6) is formed. Structural analysis showed that AdCl_(6) is an ionic compound. Given that DCl_(3) is trigonal planar and Acl_(3) is trigonal pyramidal, predict the shape of the anion DCl_(4)^(-). |
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Answer» SEE - saw |
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| 18053. |
Which type of bond is formed by transition metal with a metal ligand, at the time of hybrid ion formation |
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Answer» lonic |
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| 18054. |
Which of the following is similar to graphite ? |
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Answer» BN |
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| 18055. |
What are the number of atoms per unit cell and the number of nearest neighbours in a bcc structure ? |
| Answer» Answer :C | |
| 18056. |
What is the ratio by weight of NaF and NaI which when dissolved in water produces the same obtained on evaporation of the salt solution is 0.48 g per 100 mL of solution evaporataed. Assume complete dissociation of the salts. |
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Answer» Solution :Suppose in 100 mL of the solution, NaF = a G and NaI = b a . Then `a+b=0.48"…(i)"` `piV=i n R` For `NaF+NaI` solution in WATER, `"V = 100 mL = 0.1 L, n"=(a)/(42)+(b)/(150)` `""`(MOL. mass of NaF = `23+19=42,"Mol. mass of NaI"=23+127=150)` i = 2 (as NaF or NaI on dissociation produce 2 ions) `therefore""pixx0.1=2xx((a)/(42)+(b)/(150))xx0.0821xxT"...(II)"` For ureain water, `pi=CRT"(urea is non - electrolyte)"` `pi=0.1xx0.0821xxT"..(III)"` Dividing eqn. (ii) by eqn. (iii) `0.1=(2xx((a)/(42)+(b)/(150)))/(0.1)"or"(a)/(42)+(b)/(150)=(0.01)/(2)=0.005"or"150a+42b=31.5"...(iv)"` From eqns. (i) and (iv), on solving `a=0.105, b=0.375` `therefore"Ratio "=(a)/(b)=(0.105)/(0.375)=0.28` |
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| 18057. |
Which one of the following will from a hydrophobic sol ? |
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Answer» GUM |
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| 18058. |
Which of the following metal is used as a thin foil in cigarate packet? |
| Answer» ANSWER :A | |
| 18059. |
Which of the following is a direct dye |
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Answer» Phenolphthalein |
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| 18060. |
Which of the following is the fastest reaction ? |
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Answer» `overset(..)uoverset(..)U1/(2)2overset(250^@C)RARR` |
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| 18061. |
When phenol is treated with D_(2)SO_(4)//D_(2)O, some of the hydrogens get exchanged. The final product in this exchange reaction is |
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| 18062. |
Write short notes on the following : (i) Carbylamine reactions . (ii) Gabriel-Phthalimide synthesis |
Answer» SOLUTION :(ii) This is USED to prepare `1^@` amine as EXPLAINED below 
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| 18063. |
When KMnO_4 reacts with l^- in a slightly alkaline and acidic medium, the respective products obtained are |
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Answer» `MN^(2+) + lO_3^(-) MnO_2^(+) l_2` |
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| 18064. |
The structure of glucose in Haworth projection formula is |
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Answer»
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| 18065. |
Which of the following polymers can have strong intermolecular forces? |
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Answer» NYLON |
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| 18066. |
What is a fuel cell ? Give advantages of a fuel cell. |
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Answer» Solution :Fuel cell. It is a device which DIRECTLY converts SOLAR energy into electrical energy e.g. `H_(2)-O_(2)` fuel cell. Advantages of fuel cell : (i) It does not cause pollution (ii) It has INFINITE life time. (III) It has an EFFICIENCY of 60-70%. |
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| 18067. |
What is caused due to deficiency of vitamin H ? |
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Answer» BONE DEFORMATION |
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| 18068. |
Which enzymeis usedin the conversionof sucroseinto glucoseand fructose ? |
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Answer» ZYMASE |
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| 18069. |
Which is least acidic ? SbH_(3), PH_(3), NH_(3), AsH_(3) |
| Answer» SOLUTION :A compound which is most BASIC is OBVIOUSLY least ACIDIC. Since `NH_(3)` is the most basic compound, therefore, it is least acidic. | |
| 18070. |
What is the order of reaction whose rate constant has the same units as rate of reaction ? |
| Answer» SOLUTION :ZERO ORDER | |
| 18071. |
When neo pentyl bromide is subjected to Wurtz reaction, the product formed is : |
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Answer» 2, 2, 4, 4-tetramethylhexane |
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| 18072. |
When a catalyst is added to a system the: |
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Answer» Equilibrium CONCENTRATION are increased |
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| 18073. |
which of the following act as catalyst? |
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Answer» <P> `(PH_(3)P)_(3),RECI` |
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| 18074. |
Which of the following substance can be used directly as feriliaer? |
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Answer» `(NH_(4))_(2)SO_(4)` |
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| 18075. |
Which substances chars when warmed with conc H_2SO_4 ? |
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Answer» Protein |
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| 18076. |
Which complex has square planar structure? |
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Answer» `NI(CO)_4` |
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| 18077. |
What organic compound is obtained when ethyl bromide reacts with aq. NaOH solution? |
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Answer» SOLUTION :When ethyl bromide REACTS with AQ. NAOH ethyl alcohol is obtained. `CH_3CH_2Br OVERSET(aq. NaOH)rarr CH_3CH_2OH+NaBr` |
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| 18078. |
Write the Nernst equation and Cell reaction of the following cell Zn|Zn^(2+)(0.01)M)||Cu^(2+)(0.01)M)|Cu |
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Answer» Solution :`ZntoZn^(2+)+2E` `Cu^(2+)+2etoCu` `Zn+Cu^(2+)TOZN^(2+)+Cu` ( CELL reaction ) NERNST equation for the above cell reaction is `E_("cell")=E_("cell")^(@)+(0.0591)/(2)LOG""([Cu^(2+)])/([Zn^(2+)])` `E_("cell")=E_("cell")^(@)+(0.591)/(2)log""(0.01)/(0.01)` `E_("cell")=E_("cell")^(@)+zero` `E_("cell")=E_("cell")^(@)` |
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| 18079. |
What is a simple salt? |
| Answer» SOLUTION :A SIMPLE salt is ONE that contains one BASIC radical and one acid radical. | |
| 18080. |
What are glycosidic linkages? In which type of biomolecules are they present ? |
| Answer» Solution :The oxide linkage formed between two or more units of MONOSACCHARIDES by the loss of water MOLECULE is CALLED GLYCOSIDIC linkage. The glycosidic linkages are PRESENT in carbohydrates. | |
| 18081. |
Which of the following reaction is/ are correct? |
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Answer» `PhNO_(2)overset(LAH)rarr PhNH_(2)` d. ` PhNHOH` (Phenyl hydroxyl) amine ) |
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| 18082. |
Which of the following structure is enantiomeric with the molecule (A) given below : |
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Answer» `(a), (b), (C),(d)` |
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| 18083. |
Which of these species has a standard enthalpy of formation equal to zero |
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Answer» `F_(2)(G)` |
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| 18084. |
The reducing power of divalent species decrease in the order |
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Answer» `GegtSngtPb` HENCE reducing power,`GegtSngtPb` |
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| 18085. |
Which product is obtained when chlorobenzene react with NaCN in presence of Cu_(2)(CN)_(2) at 473 K temp and high pressure ? |
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Answer» PHENYL cynide |
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| 18086. |
Which of the following acids is a vitamin? |
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Answer» ASPARTIC ACID 
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| 18087. |
What are anti fertility drugs? Give examples. |
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Answer» SOLUTION :ARTIFICIALLY drugs are chemical substances which suppress the action of hormones that promote pregnancy. These drugs actually reduce the chances of pregnancy and ACT as a protection. Antifertility drugs are MADE up of derivatives of synthetic progesterone or a combination of derivatives of oestrogen and progesterone. Example : Ethynylestradiol, menstranol and norethynodrel etc. |
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| 18088. |
Which of the following methods yield saturated hydrocarbons |
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Answer» `RCH=CH_2underset((ii)CH_3COOH)OVERSET((i)BH_3) to `  HENCE, in all these reactions, saturated HYDROCARBONS are PRODUCED . Hence, choices (a),(b), ( c ) and (d) are correct. |
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| 18089. |
Which of the following statement is /are correct regarding nucleus of an atom ? |
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Answer» As number of protons increases in the nucleus, the number of neutrons REQUIRED for overcoming proton-proton repulsions also increase. (B) slow moving proton will not capture by the nucleus becose it will be repal be the nucleus (C) `._(92)^(235)U+._(0)n^(1) rarr .-(36)Kr^(90) +._(56)Ba^(142)+4_(0)n^(1)` (D) nucleus always release `gamma` ray during `alpha` , `beta` decay. |
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| 18090. |
Which is the correct representation for Nernst equation : |
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Answer» `E_(RP) =E_(RP)^@ +_n^(0.059) LOG [OXIDANT]/[reductant]` |
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| 18091. |
The term fools gold is used for a mineral which shines likes gold . It is : |
| Answer» Answer :A | |
| 18092. |
Which of the following sequences helps to establish the structure and configuration of maltose? |
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Answer» oxidation, methylation and hydrolysis Now two questions remain UNANSWERED: Which`-OH` group is involved, and what are the sizes of the RINGS in the two `D- (+)-` glucose units? ANSWERS to both these questions are given by the sequence of oxidation, methylation, and hydrolysis. |
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| 18093. |
Which out of the following does not dissolve in dilute HCl ? |
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Answer» ZnS |
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| 18094. |
Which among the following order of given properties is correct |
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Answer» `HOClgtHClO_(2)gtHClO_(3)gtHClO_(4)` - oxidising NATURE |
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| 18095. |
What reagent is used in Hinsberg test of amines? |
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Answer» `(CH_(3)CO)_(2)O` and PYRIDINE |
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| 18096. |
Which of the following is an example of Emulsion? |
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Answer» MAYONNAISE |
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| 18097. |
What conclusion may be drawn from the following results of (a) and (b) ? (a) If a 1 xx 10^(-3) kg body is travelling along the x-axis at 1 m/s within 0.01m/s. Calculate the theoretical uncertainty in its position. (b) If an electron is travelling at 100 m/s within 1m/s, calculate the theoretical uncertainty in its position. [h= 6.63 xx 10^(-34)J.s, mass of electron =9.109 xx 10^(-31)kg] |
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Answer» Solution :(a) The velocity has an uncertainty of 0.02m/s. (from 0.99 to 1.01 m/s) `therefore Delta x= (h)/(4pi m Delta v)= (6.63 xx 10^(-34) (J.s))/((4 xx 3.14) (1 xx 10^(-3) kg) (0.02m//s))` `=3 xx 10^(-30)` metre (B) `Delta x= (6.63 xx 10^(-34) (J.s))/((4 xx 3.14) (9.109 xx 10^(-31)kg) (2m//s))` `~~3 xx 10^(-5)` metres |
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| 18098. |
Which of the following combination of aldehydes gives cross Cannizzaro reaction? |
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Answer» `CH_(3)CHO,HCHO` |
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| 18099. |
What is obtained by the oxidation I^(-) with MnO_(4)^(-) in alkaline solution? |
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Answer» `IO_(4)^(-)` |
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| 18100. |
What is meant by Faraday ? How is it calculated ? |
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Answer» Solution :One Faraday is defined as the charge of one mole of electron. Charge of one electron = `1.6 xx 10^(-19)` C Charge of 1 mole of electrons = `6.023 xx 10^(23) xx 1.602 xx 10^(-19)` C `= 6.023 xx 10^(21) xx 1.602 xx 10^(-19) C` `= 96488 C` i.e., ` 1 F = 96500 C` |
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