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27951.	The metal obtained by self reduction process is
Answer» Cu Hg PB Al Solution :Oxides of unreactive METALS like Cu, Pb, Hg are extracted by self REDUCTION. `{:(2HgO+HgS to 3Hg+SO_(2)),(Cu_(2)S+2Cu_(2)O to 7Cu+SO_(2)),(2PbO+PbS to 3Pb+SO_(2)):}`

27952.	The most reactive of the following is
Answer» Acetone Benzophenone Benzaldehyde Acetaldehyde Solution :Relative reactivity of ALDEHYDES and ketones depends upon (i) INDUCTIVE EFFECT and (ii) STERIC effect.

27953.	The metal not present in german silver is
Answer» Ag Cu Ni Zn Answer :A

27954.	The most reactivenucleophile among the followingis :
Answer» `C_(6)H_(5) O^(-) ` `CH_(3)O^(-)` `(CH_(3))_(2) CHO^(-)` `(CH_(3))_(3) CO^(-)` ANSWER :B

27955.	The metal nitrate that liberates NO_(2) on heating
Answer» `LiNO_(3)` `NaNO_(3)` `RbNO_(3)` `KNO_(3)` SOLUTION :`4LiNo_(3)to2Li_(2)O+4NO_(2)+O_(2)`

27956.	The most reactive noble gas element is
Answer» He Ne Kr Xe Answer :D

27957.	The metal never found in free state is
Answer» AU Ag Pt Zn Answer :D

27958.	The most reactive isotope of H is:
Answer» `1^(H^1)` `1^(H^2)` `1^(H^3)` ANSWER :A

27959.	Themetal never found in free state is
Answer» Au Ag Pt Zn Answer :D

27960.	The most reactive halogen in the halogenation of alkanes is:
Answer» `Cl_2` `Br_2` `I_2` All are equal Answer :A

27961.	The metal ion(s) which is/arenot precipitate when H_(2)Sis passed with HCI is ion
Answer» `ZN^(2+)` `NI^(2+)` `CD^(2+)` `Mn^(2+)` ANSWER :a,b,d

27962.	The most reactive form of carbon is :
Answer» Diamond Graphite Coal Charcoal Answer :D

27963.	The most reactive conformation for an E2 reaction is
Answer» SYN periplanar anti periplanar gauche staggered gauche eclipsed Answer :B

27964.	The metal iron obtained for the last furnace contains X' percent of carbon. The maximum value of 'X' is
Answer» 1 2 3 4 Answer :D

27965.	The most reactive compound towards Hofmann bromamide degradation is
Answer» ANSWER :2

27966.	The metal ion which is NOT coloured, is
Answer» `Fe^(3+)` `V^(2+)` `ZN^(2+)` `TI^(3+)` ANSWER :B::C

27967.	The most reactive compound towards electrophilic substitution reaction is :-
Answer» ANSWER :A

27968.	The metal ions present in body fluids are
Answer» SODIUM , POTASSIUM , Calcium Sodium ,Calcium Potassium , Zinc Magnesium , Iron Answer :A

27969.	The most reactive compound toward reaction with AgNO_3 solution is :-
Answer» ANSWER :D

27970.	The metal ion which does not from coloured compound is:
Answer» Chromium Iron Zinc Manganese Answer :C

27971.	The most reactive compound in electrophilic substitution reaction is
Answer» ANSWER :A

27972.	The metal ion which forms a soluble complex in presence of excess of NH_4OH is
Answer» `CU^(2+)` `Pb^(2+)` `Fe^(3+)` `Al^(3+)` ANSWER :A

27973.	The most reactive among the following pairs towards NaOH is
Answer» In I-X In II-Q In III-Z In IV-T Solution :(a) is correct as `C_(6)H_(5)OH` is more acidic than alcohol due to resoance stablization of conjugate base. (C) is correct due to the PRESENCE of there strong deactiveating groups so `C-Cl` bond is highly susceptahle to nucleophilic attack while in `R` it is not so because lone pairs of electrons are in conjugation with benzene ring. (d) is correct because `HCOOH` is more acidic than `C_(6)H_(5)COOH`.

27974.	The most reactive amine towards dilute hydrochloric acid is _______________ .
Answer» `CH_3 -NH_2` SOLUTION :The AMINE which is most BASIC is more REACTIVE .i.e., `(CH_3)_2NH. `

27975.	The metal-insoluble salt electrode consists of a metal M coated with a porous insoluble salt MX In a solution of X^(-), A good example is Ihe silver, silver-chloride electrode for which the half-cell reaction is AgCI(s)+e Leftrightarrow Ag(s) + CI (aq), where, the reduction of sold silver chloride produces solid silver and releases chloride ion into solute for the cell M(s)\|M^(2+) (aq)\|\|Ag^(+) (aq)\|Ag(s)""E_(M//M^(2+))^(@)=+2.37V and E_(Ag//Ag)^(@)=+0.80V If cell reaction is in equilibrium stage, value of logarithms of equilibrium constant is
Answer» 1.0745 107.45 1074.5 10.745 Answer :B

27976.	The most reactive among the following towards sulphonation is
Answer» SOLUTION :

27977.	The most reactive amine towards dilute hydrochloric acid is
Answer» `CH_3 -NH_2` SOLUTION :The AMINE which is most BASIC is more REACTIVE .i.e., `(CH_3)_2NH. `

27978.	The metal-insoluble salt electrode consists of a metal M coated with a porous insoluble salt MX In a solution of X^(-), A good example is Ihe silver, silver-chloride electrode for which the half-cell reaction is AgCI(s)+e Leftrightarrow Ag(s) + CI (aq), where, the reduction of sold silver chloride produces solid silver and releases chloride ion into solute for the cell M(s)\|M^(2+) (aq)\|\|Ag^(+) (aq)\|Ag(s)""E_(M//M^(2+))^(@)=+2.37V and E_(Ag//Ag)^(@)=+0.80V The reaction: 1/2H_(2) (g) +AgCl(s) to H^(+) (aq)+Cl^(-) (aq)+Ag(s) occurs in the galvanic cell
Answer» `Ag\|AGCL(s)\|KCl(aq)\|AgNO_(3)(aq)\|Ag` `Pt\|H_(2)(G)\|HCL(aq)\|AgNO_(3)(aq)\|Ag` `Pt\|H_(2)(g)\|HCl(aq)\|AgCl(s)\|Ag` NONE of these Answer :C

27979.	The most reactive amine towards dilute hydrochloric acid is:
Answer» `CH_(3)-NH_(2)` SOLUTION :The amine which is most basic is most REACTIVE i.e., `(CH_(3))_(2)NH.`

27980.	The metal ion present in haemoglobin and is responsible for oxygen uptake is :
Answer» `Mg^(2+)` `Fe^(3+)` `Fe^(2+)` `CO^(3+)`. Answer :B

27981.	The metal ion present in the human body in greater % is
Answer» Ca Na K Fe Answer :A

27982.	The most reactive amine towards dilute hydrochloric acid is____
Answer» `CH_(3)-NH_(2)` Solution :The AMINE which is most BASIC is most REACTIVE i.e., `(CH_(3))_(2)NH`.

27983.	The most reactive alkane is:
Answer» `CH_4` `CH_3(CH_2)_2CH_3` `CH_3CH_2CH_3` `(CH_3)_3CH` ANSWER :B

27984.	The metal-insoluble salt electrode consists of a metal M coated with a porous insoluble salt MX In a solution of X^(-), A good example is Ihe silver, silver-chloride electrode for which the half-cell reaction is AgCI(s)+e Leftrightarrow Ag(s) + CI (aq), where, the reduction of sold silver chloride produces solid silver and releases chloride ion into solute for the cell M(s)\|M^(2+) (aq)\|\|Ag^(+) (aq)\|Ag(s)""E_(M//M^(2+))^(@)=+2.37V and E_(Ag//Ag)^(@)=+0.80V Emf of given cell, when concentration of M^(2+) ion and concentration of Ag^(+) ion both are 0.01 M
Answer» 3.17 3.11 3.01 3.21 Answer :B

27985.	The metal-having highest melting point is
Answer» CHROMIUM TUNGSTEN Diamond Silver Solution :Tungsten (W) having HIGHEST m.p.

27986.	The most reactive allotropic form of phosphorus is:
Answer» RED phosphorus Yellow phosphorus Black phosphorus Violet phosphorus Answer :B

27987.	The metal extracted through self-reduction process is __________.
Answer» Al Cu Ag Zn Answer :B

27988.	The most probable speed of an ideal gas at constant pressure varies with density (d) as
Answer» `sqrtd` `d^2` `FRAC{1}{sqrtd}` `frac{1}{d}` ANSWER :B

27989.	The most probable compound whose molecular formula is C_(3)H_(6)O and which can give Tollen's reagent test
Answer» `CH_(3)CH_(2)CHO` `CH_(3)COCH_(3)` `CH_(3)OCH_(2)CH_(3)` `CH_(2)= CHCH_(2) OH` ANSWER :A

27990.	The metal extracted by leaching with a cyanide is
Answer» Al Na Cu Ag Answer :D

27991.	The most probable oxidation states of Cr and Mo are…..
Answer» `+2,+3,+4` `+2,+3,+6` `+3, +4,+5` `+2, +3, +5` ANSWER :B

27992.	The metal extracted by leaching with a cyanide
Answer» Al Ag Cu Na Solution :Silver are forms a soluble complex with NaCN from which silver is precipitated using scrap ZINC (i) `Ag_(2)S + 2NaCN rarr Na [Ag(CN)_2]ZN` (ii) `Na_(a)(Zn(CN)_4] + Ag DARR` Sodium argentocyanide (soluble)

27993.	The metal extracted by lcaching with a cyanide is
Answer» Mg Ag Cu Na Answer :B

27994.	The most powerful oxidizing agent is
Answer» `H_2SO_4` `H_2PO_3` `H_(3)PO_(4)` `HPO_(3)` ANSWER :A

27995.	The metal extracted by cyanide process is :
Answer» Silver Copper Iron Sodium ANSWER :A

27996.	The metal carbonyl which is paramagnetic is
Answer» `Ni(CO)_(4)` `V(CO)_(6)` `CR(CO)_(6)` `FE(CO)_(5)` Answer :B

27997.	The most poweful oxidising agent is :
Answer» `F_2` `Cl_2` `Br_2` `I_2` ANSWER :A

27998.	The metal-carbon bond in metal ______ possess both sigma and pi character.
Answer» ANSWER :CARBONYLS

27999.	The most polarisable boble gas is:
Answer» Kr Ne Xe Ar Answer :C

28000.	The metal cobalt is present in ............
Answer» Vitamin-A Vitamin-`B_(1)` Vitamin-`B_(12)` Vitamin-`B_(6)` SOLUTION :Vitamin-`B_(12)`

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