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28951.	The lighest metal among the following is:
Answer» Na Ca Li Mg Answer :C

28952.	The lighest gas is
Answer» `N_(2)` Ar Rn He Solution :The LIGHTEST GAS is HYDROGEN (H). Its atomic weight is 1.008. but among the mentioned gases lightest one is helium (He). Its atomic weight is 4.003.

28953.	The ligands SCN linked to the metal atom through S is called …… whereas when linked through N, it is called …… .
Answer» SOLUTION :thiocyanato, isothiocyanato

28954.	The ligand which gives chaelate complexes is:
Answer» `SCN^(-)` `NH_(2)-overset(+)NH_(3)` EDTA `C_(2)O_(4)^(2-)` Solution :Chelating ligands are POLYDENTATE, Eg. EDTA

28955.	The ligands in anticancer drug "eis-platin" are
Answer» `NH_(3),CL` `NH_(3),H_(2)O` `Cl,H_(2)O` `NO,Cl` SOLUTION :cis-platin

28956.	The ligand N(CH_(2)CH_(2)NH_(2))_(3) is
Answer» tridentate pentadentate tatradentate bidentate Solution :GIVEN LIGAND has FOUR DONOR N-atoms and HENCE tatradentate.

28957.	The ligand used in the identification of cupric copper in the laboratory
Answer» `NH_3` `I^-` `CN^-` `S_2O_3^(2-)` ANSWER :A

28958.	The life span of a Daniel cell is increased by
Answer» LARGER Zn electrode larger CU electrode lowering the temperature lowering the concentration Solution :In a Daniel CELL , the Zinc atoms from the zinc rod lose in their VALENCE electrons and dissolve as `Zn^(2+)` cations in Zinc sulphate solution. So , the zinc rod GET depleted as the cell is working .

28959.	The ligand called pi-acid is
Answer» Co `NH_(3)` `C_(2)O_(4)^(-)` ethylene diamine Solution :LIGANDS like `CO, CN^(-)` and `NO^(+)` have EMPTY `pi`-orbitals which can overlap with the metal `t_(2G)` orbitals forming `pi`-bonds. This is called back bonding. As they accept ELECTRON PAIRS from `t_(2g)` orbitals of the metal, they are called `pi`-acids or `pi`-acceptors.

28960.	The life of a daniel cell may be increased by:
Answer» Maintaining LOW temperature Using a LARGE copper electrode Decreasing the concentration of copper ions Using large ZINC electrodes Answer :D

28961.	The Li^(+) ion, though smallest in size is the poorest conductor of electricity as compared to other alkali metal ions in water. This is due to :
Answer» its smaller ionic radius in water its low ELECTROPOSITIVE character its larger DEGREE of hydration its HIGH melting and boiling points. Answer :C

28962.	The S in buna-S refers to
Answer» STYRENE sulfur sodium none of these Solution :styrene

28963.	The letter S in Buna-S refers to
Answer» STYRENE sulfur sodium none of these Solution :styrene

28964.	The letter 'D' in D-glucose signifies.
Answer» CONFIGURATION at all Chiral CARBONS. dextrorotatory. that it is a MONOSACCHARIDE. configuration at the penultimate Chiral Carbon. Answer :D

28965.	The letter 'D' in D-glucose signifies
Answer» configuration at all CHIRAL CARBONS dextrorotatory that it is a monosaccharide configuration at the PENULTIMATE chiral CARBON Answer :D

28966.	The letter 'D' in D-glucose signifies :
Answer» configuration at all CHIRAL CARBONS DEXTROROTATORY that it is a monosaccharide configuration at a PARTICULAR chiral carbon. Answer :D

28967.	The letter 'D' in carbohydrates represents
Answer» Its directsynthesis its dextrorotation its mutarotation its configuration Answer :D

28968.	The letter D in carbohydrates represents
Answer» Its DIRECT synthesis Its dextrorotation Its mutarotation It configuration Answer :D

28969.	The letter D and L in carbohydrates represent
Answer» it's OPTICAL rotation its mutarotation its DIRECT synthesis its configuration Answer :D

28970.	The less available halide in sea water
Answer» `bar(F)` `CL^(-)` `Bbar(r )` `I^(-)` SOLUTION :F- is LESS available in sea water.

28971.	The less reactive alkyl halide towards SN^2reaction than ethyl chloride
Answer» `CH_3Cl` SOLUTION :Halogen atoms which are attached with BRIDGED carbons and aryl carbon are ONE less REACTIVE towards `SN^2`

28972.	The lesser solubility of NaHCO_3 than Na_2CO_3 in water is mainly due to
Answer» higher lattice energy DUE to smaller size of `HCO_3^-` ion smaller hydration energy fo larger `HCO_3^-` ion INTERMOLECULAR H-bonding intermolecular H-bonding between `NaHCO_3` molecules and water molecules of crystallisation. Solution :Lesser SOLUBILITY is due to extensive intermolecular H-bonding between bicarbonate IONS in `NaHCO_3`.

28973.	The least technique for the purification of organic compounds is
Answer» FRACTIONAL distillation CHROMATOGRAPHY Vacuum distillation Crystallisation Solution :Chromatography is the LATEST for the PURIFICATION of organiccompounds. Chromatography are of various tupe viz. Column chromatography, gas chromotography, paper cgromatography ETC.

28974.	Theleaststableoxideat roomtemperatureis
Answer» ZnO Cu O `Sb_2 O_3` `Ag_2 O` ANSWER :D

28975.	The least stable oxide at room temperature:
Answer» CUO `Ag_2O` ZNO `Sb_2O_3` ANSWER :B

28976.	The least stable hydride of 15th group elements is
Answer» `NH_(3)` `PH_(3)` `AsH_(3)` `BiH_(3)` SOLUTION :As we move from `NH_3" to "BiH_3`, size of the central atom increases and its tendency to form covalent BOND with comparatively small H-atom decreases. Hence, STABILITY decreases down the group.

28977.	The least stable hydride of 15^(th) group element is
Answer» `NH_(3)` `PH_(3)` `AsH_(3)` `BiH_(3)` Solution :As we move from `NH_(3)` to `BiH_(3)`, SIZE of the CENTRAL ATOM increases and its tendency to form COVALENT bond with COMPARATIVELY small H-atom decreases. Hence, stability decreases down the group.

28978.	The least stable conformation of cyclohexane is
Answer» Boat Chair Twist boat Half chair Answer :D

28979.	The least stable dioxide of group 16 elements is
Answer» `SO_(2)` `SeO_(2)` `TeO_(2)` `PoP_(2)` ANSWER :D

28980.	The least stable cation is :
Answer» `LI^+` `K^+` `AL^(2+)` `Si^(2+)` ANSWER :C

28981.	The least soluble compound (salt) of the following is
Answer» CsCl` (K_(sp) = 10^(-12))` HgS `(K_(sp) = 1XX 10^(-52))` `PbCl_(2) (K_(sp) = 1.7 xx 10^(-5))` `ZNS (K_(sp) = 1.2 xx 10^(-23))` ANSWER :B

28982.	The least soluble alkaline earth metal sulphate is :
Answer» `MgSO_(4)` `CaSO_(4)` `SrSO_(4)` `BaSO_(4)` ANSWER :D

28983.	The leastrandom state of H_(2)O is -
Answer» Ice liquid water Steam Randomness is same in all Answer :A

28984.	The least powerful oxidant in presenc of H_(2)O is
Answer» `F_(2)`<BR>`Cl_(2)` `Br_(2)` `I_(2)` SOLUTION :The rectivity of HALOGENS with WATER decreases from `F_(2)` to `I_(2)`

28985.	The least positive electron gain enthalpy is for
Answer» He Ne Ar Xe Answer :A

28986.	The least non - metallic halogen is :
Answer» `F`<BR>`CL` `Br` `I.` ANSWER :D

28987.	The least energetic conformation of cyclohexane is:
Answer» BOAT form Half CHAIR form Chair form Twisted form Answer :C

28988.	The least basic N in the given molecule is?
Answer» ANSWER :D

28989.	The least basic trihalide of nitrogen among the following trihalides
Answer» `NCl_3` `NBr_3` `NF_3` `NI_3` SOLUTION :BASIC NATURE : `NF_3 LT NCl_3 lt NBr_3 lt NI_3`

28990.	The least basic hydroxide is
Answer» `La (OH)_(3)` `CE (OH)_(3)` `LU (OH)_(3)` `Pm (OH)_(3)` Answer :C

28991.	The leastbasicaminein aqueous mediumis .
Answer» `(C_(2)H_(5))_(2)NH` `(C_(2)H_(5))_(3)N` `(CH_(3))_(2)NH` `(CH_(3))_(3)N` ANSWER :D

28992.	The leastabundant isotopeof hydrogenis
Answer» `""_1^1(H)` `""_1^2(H)` `""_1^3(H)` both a and B ANSWER :C

28993.	The Lead storage battery is used in ……………… .
Answer» PACEMAKERS AUTOMOBILES electonic WATCHES FLASH light Answer :B

28994.	The lead storage battery consists of
Answer» LEAD anode and a GRID a lead PACKED with `PbO_2` as CATHODE. grid of lead packed with `PbO_(2)`as anode and lead cathode. Zn anode and a grid of Zn packed with ZnO as cathode grid on Zn packed with ZnO as anode and Zn anode. ANSWER :A

28995.	The lead accumulator is
Answer» PRIMARY , REVERSIBLE VOLTAIC cell secondary , reversible voltaic cell primary , IRREVERSIBLE voltaic cell secondary, irreversible cell Answer :B

28996.	The laws of electrolysis were enunciated first by
Answer» Dalton Faraday Kekule Avogadro Answer :B

28997.	The law which does not follow Dalton's atomic theory is……………….. .
Answer» SOLUTION :Gay-Lussac's LAW of GASEOUS VOLUMES

28998.	The law which relates the solubility of a gas to its pressure is called :
Answer» RAOULT's law Ostwald's law Distribution law Henry's law Answer :D

28999.	The law of octaves was given by
Answer» LUTHER Meyer Newlands Dobereiner Lavoisier Answer :B

29000.	The law of octaves is applicable too :
Answer» B, N, C Be, Mg, Ca Ar, K, Ca Se, TE, As Answer :C

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