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2651.

Write the composition of Diaspore.

Answer»

SOLUTION :The COMPOSITION of Diaspore is `Al_(2)O_(3).H_(2)O`.
Discussion
2652.

Which of the following is an odd electron molecule?

Answer»

`CO_2`
`SO_2`
`NO_2`
`Al_2O_3`

ANSWER :C
Discussion
2653.

Which of the following statements are correct both calcination and roasting?

Answer»

Both involve thermal decompoition.
Product of both PROCESS are porous
Impurities of organic COMPOUNDS are REMOVED in the forms of gas
Ores used are of SIMILAR type in bothprocess

Answer :B,C
Discussion
2654.

Which of the following fluoro-compounds is most likely to behave as a Lewis base?

Answer»

`BF_3`
`PF_3`
`CF_4`
`SiF_4`

ANSWER :B
Discussion
2655.

Which metal among the following has the highest packing efficiency?

Answer»

Iron
Tungsten
Aluminium
POLONIUM

Solution :Iron and Tungsten have BCC, Poloniumhas SCC while Al has FCC TYPE structure.
The order of packing efficiency is
SSC `(52.4%) ltB"CC" (68.04 %) lt F"CC" (74%)`
Discussion
2656.

When a magnetic field is applied to substances, mainly two type of magnetic behaviour are observed. These are

Answer»

paramagnetism and ferromagnetism
ferromagnetism and ferromagnetism
ferrimagnetism and DIAMAGNETISM
paramagnetism and diamagnetism

Solution :When a magnetic FIELD is applide to substance, MAINLY two TYPE of magnetic BEHAVIOUR are observed-paramagnetism and diamagnetism.
Discussion
2657.

Which of following reaction represent major product?

Answer»




SOLUTION :`NaBH_(4)` will not REDUCE ESTER.
Discussion
2658.

When Br_(2) is treated with aqueous solutions of NaF, NaCl and NaI separately

Answer»

`F_(2), Cl_(2) and I_(2)` are liberated
only `F_(2)` and `Cl_(2)` are liberatede
only `I_(2)` is liberated
only `Cl_(2)` is liberated

Solution :`Br_(2)` REACTS with `NaI` only to GIVE `I_(2)`.
`2NaI+Br_(2)rarr 2NaBr+I_(2)`.
Discussion
2659.

XeF_6 has what geometry.

Answer»

SOLUTION :PENTAGONAL bipyramidal
Discussion
2660.

Why cannot vitamin-C be stored in our body ?

Answer»

Solution :Vitamin-C is a water-soluble vitamin. It readily EXCRETES out of the BODY through urine. Thus, it cannot be stored in a body and NEEDS to be supplied REGULARLY in the diet.
Discussion
2661.

The solubility of Ba(OH)_(2)8H_(2)O in water at 298 K is 5.6 g per 100 g of water. What is the molality of the hydroxide ions in a saturatd solution of barium hydroxide at 298 K ? (Atomic mass of Ba =137, O=16)

Answer»


Solution :MOLALITY of `OH^(-)` ions `=2XX"molality of BA(OH)"_(2)`.
Discussion
2662.

Which compoundis related to Haber's process

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`CO_(2)`
`H_(2)`
`NO_(2)`
`NH_(3)`

SOLUTION :AMMONIA GENERALLY prepared by the HABER's process.
Discussion
2663.

Which of the following isomers of [M(NH_(3))_(2)Cl_(2)] would react with silver oxalate (Ag_(2)C_(2)O_(4)) ?

Answer»



Both (a) and (b)
NONE of these

Solution :Only in the cis isomer, 2 monodentate ligands can be displaced by ONE BIDENTATE ligand.
Discussion
2664.

What is meant by chelate effect ? Give an example.

Answer»

Solution :Whe a didentate or a polydentate ligand contains donor atoms positioned in such a way that when they COORDINATE with the central metal ion, a five or a six membered ring is formed, the effect is CALLED CHELATE effect. As a result, the stability of the COMPLEX increases. For example, the complex of `Ni^(2+)` with EN is more stable than with `NH_(3)`
`Ni^(2+)(aq)+6NH_(3)(aq)iff[Ni(NH_(3))_(6)]^(2+),logbeta=8.61`
`Ni^(2+)(aq)+3en(aq)iff[Ni(en)_(3)]^(2+), log beta=18.28`
Another example of chelation and stability is given below :
Discussion
2665.

Therecurringdeoxyribonucleotie units od DNAcontants………………and theribonculeoitdeunit of RNAcontain…………….

Answer»

SOLUTION : 2.- DOXY D -RIBOSE, D-ribose
Discussion
2666.

Which orbit of Be^(3+) has almost same radius as that of the ground state ofH-atom?

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Second
Third
Fourth
Sixth

Solution :`r_(n)=(0.059n^(2))/Z`
`r_(1)=(0.059xx1^(2)=0.059`
`r_(n)(Be^(3+))=(0.059xxn^(2))/4=0.059 "" ( :. Z=4)`
` n^(2)=4 `or `n=2`
Discussion
2667.

Which is the second monomer used with phenol to prepare bakelite ?

Answer»

ADIPIC ACID
ETHYLENE glycol
Acetaldehyde
FORMALDEHYDE

Solution :Formaldehyde
Discussion
2668.

The total number of optically inactive products obtained from the complete ozonolysis of the compound given below here is

Answer»

2
4
1
0

Answer :B
Discussion
2669.

Which of he following is a 'p'-block element in the periodic table ?

Answer»

Na
Mg
N
Mn

Answer :C
Discussion
2670.

Vitamin C is found in fruits and vegetables. It cannot be stored in our body. Why?

Answer»

Solution :It is SOLUBLE in water and EXCESS of it is READILY excreted in urine.
Discussion
2671.

Which of the following will react with water?

Answer»

`CHCl_(3)`
`Cl_(3)C CHO`
`C Cl_(4)`
`ClCH_(2)CH_(2)CL`

ANSWER :B
Discussion
2672.

Which of the following element show +2 oxidation state in 4f^(7) configuration ?

Answer»

PM
Tb
EU
Ho

Solution :We know that `Eu^(2+)` hs ELECTRONIC configuration `6S^(0), 4f^(0), 5d^(0).`
Discussion
2673.

When concentrated H_2SO_4 is added to dry KNO_3, brown fumes evolve. These fumes are of:

Answer»

`SO_2`
`SO_3`
`NO_2`
NO

Answer :C
Discussion
2674.

When AgNO_(3) is added to a solution of Co(NH_(3))_(5)Cl_(3), the precipitate of AgCl shows two ionisable chloride ions. This means:

Answer»

Two chlorine ATOMS satisfy PRIMARY VALENCY and one secondary valency
One chlorine atom satisfies primary as well as secondary valency
Three chlorine atoms satisfy primary valency
Three chlorine atoms satisfy secondary valency

Solution :Since the PRECIPITATE of AgCl shows two ionisable chloride ion the complex must have the structure.
`[Co(NH_(3))_(5)Cl]Cl_(2)+2AgNO_(3) to [Co(NH_(3))_(5)Cl](NO_(3))_(2)+2AgCl`
Hence two chlorine atoms satisfy the primary valency and one secondary valency.
Discussion
2675.

Total number of amines possible for C_(4)H_(11)N is (exclude stereo-isomers)

Answer»


Solution :`C_(4)H_(11)NH_(3)C-CH_(2)-CH_(2)-CH_(2)-NH_(2)`
Discussion
2676.

Why cannot aromatic primary amines be prepared by Gabriel phthalimide synthesis ?

Answer»

Solution :In GABRIEL phthalimide synthesis, `S_(N)2` REACTION takes place in which the nucleophile, phthalimide anion displaces the halide ion from alkyl halide to form N-alkylphthalimide. This upon SUBSEQUENT acid or alkaline hydrolysis gives the corresponding aliphatic primary amine.

Due to resonance in Ar-X, there is some double bond character because of which, it is difficult to break Ar - X bond.
THEREFORE, aryl halides do not underog nucleophilic substitution reactions easily.
Thus, aromatic primary amines cannot be prepared by Gabriel phthalimide reaction.
Discussion
2677.

Which combination is best explained by the coordinate covalent bond ?

Answer»

`H_2 + I_2`
`MG + 1/2O_2`
`CL + Cl`
`H^++ H_2O`

ANSWER :D
Discussion
2678.

The two monomers requiredin the preparation of terylene are

Answer»

vinylchloride
phthalic acid and ethylene glycol
terephthalic acid and ethylene glycol
adipic acid and hexamethylene DIAMINE

SOLUTION :We know that , terylene is PREPARED by the condensationpolymerization of ethylene glycol and terephthlic acid with the elimination of WATER MOLECULE.
Discussion
2679.

Which of the following substances is being getting consumedduring the preparation of terylene?

Answer»

ADIPIC acid
Methyl alcohol
Ethylene glycol
Propylene glycol

Answer :C
Discussion
2680.

define specific conductance (conductivity)

Answer»

Solution :The reciprocal of specific resistance or resistivity is called specific conductance or CONDUCTIVITY.
It is the conductance of a CONDUCTOR that is 1 m in LENGTH and `1m^(2)` in cross section area in SI units.
Discussion
2681.

Write molecularity of the following reaction : 2NO_((s))+O_(2(g))to2NO_(2(g)) What is 'calcination' ? How does it differ from 'roasting' ? Write resonating structures of ozone, The decomposition of N_(2)O_(5(g)) at 320 K according to the following equation follows first order reaction : N_(2)O_(5(g))to2NO_(2(g))+(1)/(2)O_(2(g)) The initial concentration of N_(2)O_(5(g)) is 1*24xx10^(-2)mol.L^(-1) and after 60 minutes, 0*20xx10^(-2)mol.L^(-1). Calculate the rate constant of the reaction at 320 K.

Answer»

Solution :Molecularity is the sum of the different reactants which take part in a chemical reaction. Thus, molecularity of the reaction.
`2NO_((g))+O_(2(g))to2NO_(2(g))" is "(2+1)=3`
Calcination : Calcination is a process in which the ore of a metal or other solid material is heated to a high temperature below the melting point of the metal in absence of air or limited supply of air
Example : Decomposition of carbonate minerals as in the calcination of limestone to drive of `CO_(2)`.
`CaCO_(3(s))toCaO_((s))+CO_(2(g))`

The resonating structures of ozone are given below :

`O_(3)` exist as a hybrid of structure I and structure II Each ATOM may be thought as roughly `sp^(2)` hybrid.
The middle O atom has a lone pair of electrons with a delocalised `pi` ORBITAL over all the three oxygen atoms. The rate constant (K) of first order reaction at temp. t is given by
`k=(2*303)/(t)"log"(C_(O))/(t_(t))`
where, `C_(O)` = initial CONCENTRATION, `C_(t)` = concentration after time t
For `N_(2)O_(5(g))to2NO_(2(g))+(1)/(2)O_(2(g))`
`C_(O)=1*24xx10^(-2)"mol L"^(-1),C_(t)=0*20xx10^(-2)"mol L"^(-1)t=60` min.
`:.""k=(2*303)/(60)xx"log"(1*24xx10^(-2)"mol L"^(-1))/(0*20xx10^(-2)"mol L"^(-1))`
`=0*038xxlog(6*2)min^(-1)`
`=0*038xx0*792"min"^(-1)=0*030"min"^(-1)`
Thus rate constant of the reaction at 320 K is `0*030" min"^(-1)`.
Discussion
2682.

Vitamin C belongs to the class of

Answer»

VITAMINS of aliphatic SERIES
Vitamin of AROMATIC series
Vitamins of ALICYLIC series
Vitamins of heterocylic series

Answer :A
Discussion
2683.

Which property decreases from left to right across the periodic table and increases from top to bottom? (i) Atomic radius (ii) Electronegativity (iii) Ionisation energy (iv) Metallic character

Answer»

(i) only
(i) , (ii) and (iii)
(i), (iii) and (iv)
(i) and (iv)

Solution :ATOMIC NUMBER and METALLIC character decreases from left to right across the PERIOD and INCREASES from top to bottom down the group.
Discussion
2684.

Which of the following statement about H_(2)BO_(3) is not correct?

Answer»

It is a strong tribasic acid
It is prepared by ACIDIFYING an aqueous solution of borax
It has a layer structure in which PLANAR `BO_(3)` units are joined by hydrogen bonds
It does not act as proton donor bur acts as Lews acid by ACCEPTING a lone pair of electrons.

Solution :`H_(3)BO_(3)` is a weak monobasic acid.
Discussion
2685.

The standard enthalpies of combustion ofC_(6)H_(6(l)),C_(("graphite"))and H_(2(g))are respectively -3270 kJmol^(-1), -394 kJ mol^(-1) and - 286 kJ mol^(-1). What is the standard enthalpy of formation of C_(6)H_(6(l)) in kJ mol^(-1)

Answer»

`- 48`
`+ 48`
`- 480`
`+ 480`

Solution :`C_(6)H_(6(L))+(15)/(2)O_(2(g))rarr6CO_(2(g))+3H_(2)O_((l)), DeltaH=-3270 kJ mol^(-1)"...(i)"`
`C_((gr))+O_(2(g))rarrCO_(2(g)), DeltaH=-394 kJ mol^(-1)"....(II)"`
`H_(2(g))+(1)/(2)O_(2(g))rarrH_(2)O_((l)), DeltaH=-286 kJ mol^(-1)"...(iii)"`
Formation of `C_(6)H_(6)`
`6C_((gr))+3H_(2(g))rarrC_(6)H_(6(l)),DeltaH=? "...(iv)"`
By multiplying eq. (ii) with 6 and eq. (iii) with 3 and adding we get,
`6C_((gr))+6O_(2(g))+3H_(2(g))+(3)/(2)O_(2(g))rarr6CO_(2(g))+6H_(2)O_((l)) "...(V)"`
`DeltaH=6(-394)+3(-284)=(-2364)+(-858)=-3222 kJ//mol`
Now, by substracting eq. (i), from (v) we get
`6C_((gr))+3H_(2(g))rarrC_(6)H_(6(l))`
`DeltaH=-3222-(-3270)=+48kJ//mol`
Discussion
2686.

What type of crystal defect is indicated in the diagram below|{:(Na^(+),Cl^(-),Na^(+),Cl^(-),Na^(+),Cl^(-)),(Cl^(-),square,Cl^(-),Na^(+),square,Na^(+)),(Na^(+),Cl^(-),square,Cl^(-),Na^(+),Cl^(-)),(Cl^(-),Na^(+),Cl^(-),Na^(+),square,Na^(+)):}|

Answer»

FRENKEL DEFECT
frenkel and SCHOTTKY DEFECTS
insterstitial defect
schottky defect

ANSWER :D
Discussion
2687.

Which of the following metal liberates hydrogen whentreated with dilute H_2SO_4 ?

Answer»

MG
CU
Ag
Au

Solution :`Mg+H_2SO_4 to MgSO_4 + H_2 UARR`
Discussion
2688.

Which element forms amalgum ?

Answer»

Fe
Mg
Zn
Pb

Answer :C
Discussion
2689.

Which reagent cannot be used to prepare an alkyl halide from an alcohol?

Answer»

`HCl+ZnCl_(2)`
`NACL`
`PCl_(5)`
`SOCl_(2)`

ANSWER :B
Discussion
2690.

Which aqueous solution will have Ph less than7?

Answer»

`KNO_3`
NaoH
NaCN
`Fecl_3`

ANSWER :D
Discussion
2691.

Which amino acid has secondary amino group ?

Answer»

PROLINE
LYSINE
ARGININE
Alanine

Solution :Proline
Discussion
2692.

When ethyl acetate was hydrolysed in presence of 0.1 N HCl, the rate constant was found to be 5.40xx10^(-5)s^(-1). But when 0.1" N H"_(2)SO_(4) was used for the hydrolysis, the rate constant was found to be 6.20xx10^(-5)s^(-1). From these values we can say that

Answer»

`H_(2)SO_(4)` is stronger than HCl
`H_(2)SO_(4)` is weaker than HCl
Both the acids have equal strength
The data is insufficient to COMPARE the strengths of HCl and `H_(2)SO_(4)`.

Solution :(a) : For EQUIMOLAR solution of two acids, `("Strength of Acid 1")/("Strenght of Acid 2")=(k_(1))/(k_(2))`
Discussion
2693.

Which used in joint pain?

Answer»

Brine
Linseed oil
Benzoic ACID
ASPIRIN

ANSWER :D
Discussion
2694.

Which one of the following properties would you not expect copper to exhibit ?

Answer»

Malleability
High THERMAL condustivity
LOW ELECTRICAL conductivity
Ductility

Answer :C
Discussion
2695.

Which of the following gas is insoluble in water

Answer»

`SO_(2)`
`NH_(3)`
`H_(2)`
`CO_(2)`

Solution :HYDROGEN is the lightest gas. It is insoluble in WATER.
Discussion
2696.

What is rate of reaction order of the following reation ? Rate =K[X]^((4)/(5))[Y]^((1)/(5))

Answer»

1
`(6)/(5)`
`(5)/(6)`
`(4)/(5)`

ANSWER :A
Discussion
2697.

The species that does not contain peroxide ions is :

Answer»

`PbO_2`
`H_2O_2`
`SrO_2`
`BaO_2`

ANSWER :A
Discussion
2698.

Which would not react with benzene sulphony chloride in aqueous NaOH :

Answer»

Aniline
N,N-dimethyl aniline
p- toluidine
N-ethyl aniline

Answer :B
Discussion
2699.

What is polythene ? Write down its properties and types. Write down different preparation properties and uses of polythene.

Answer»

Solution :Polythenes are linear or slightly branched long chain molecules.
These are capable of repeatedly softening on heating and hardening on cooling and are thus THERMOPLASTIC polymers.
There are two types of polythene as given below :
(a) Low density polythene
(b) High density polythene.
(a) Low density polythene :
Preparation : It is polymerization of ethene under high pressure of 1000 to 2000 atmospheres at a temperature of 350 K to 570 K in the presence of traces of dioxygen or a peroxide initiator.
Properties : The low density polythene (LDP) have straight chain structure with some obtained by the branches as shown below.

The low density polythene is chemically inert and tough.
They are flexible and a poor conductor of electricity.
Uses : It is used in the insulation of electricity carrying wires.
It is also used in manufacture of squeeze bottles, toys and flexible pipes.
(b) High density polythene :
Preparation : It is formed when addition polymerization of ethene takes place in a hydrocarbon solvent in the presence of a CATALYST such as triethylaluminium and titanium TETRACHLORIDE (Ziegler-Natta catalyst) at a temperature of 333 K to 343 K and under a pressure of 6-7 atmospheres. High density polythene (HDP) thus produced.
Properties : High density polythene (HDP) thus produced, consists of linear molecules as shown below and has a high density due to close packing. Such polymers are also CALLED linear polymers.

This polymers are also chemically inert.
This polymers are more tough and hard.
Uses : It is used for manufacturing buckets, dustbins, bottles, pipes, etc.
Discussion
2700.

Which of the following is/are aromatic?

Answer»





SOLUTION :(B) `6PIE^(-)` with COMPLETE CONJUGATION (A romatic)
Discussion