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4801.

Using IUPAC norms write the formulas for the following: Pentaamminenitrito-O-cobalt(III)

Answer»

SOLUTION :`[CO(NH_(3))_(5)(ONO)]^(2+)`
Discussion
4802.

[Ti(H_(2)O)_(6)]^(3+) is coloured while [Sc(H_(2)O)_(6)]^(3+) is colourless. Why ?

Answer»

Solution :In `[Ti(H_(2)O)_(6)]^(3+), Ti^(3+)` ion has one electron in the d-subshell (lower energy `t_(2g)` d-ORBITALS, has the configuration `t_(2g)^(1)e_(g)^(0)`) which can absorb light in the VISIBLE region RESULTING into d-d transition (jump into higher energy `e_(g)` orbitals). As a result, green and YELLOW portions of light are absorbed. The complex has the complementary colour, viz, purple. In `[Sc(H_(2)O)_(6)]^(3+)`, `Sc^(3+)` has no d-electron. Hence, no light is absorbed for d-d transition. Hence, it is colourless.
Discussion
4803.

The second law of thrmodynamics says that in a cyclic process,

Answer»

WORK cannot be CONVERTED into heat
heat cannot be converted into work
work cannot be completely converted into heat
heat cannot be completely converted into work

Answer :D
Discussion
4804.

What is meant by adsorption ?

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SOLUTION :It is the PHENOMENON of HIGHER concentration of a molecular SPECIES at the surface of a solid than in bulk.
Discussion
4805.

The standard e.m.f of a cell, involving one electron change is found to be 0.591 V at 25^@C . The equlibrium constant of the reaction is

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`1.0 XX 10^1`
`1.0 xx 10^30`
`1.0 xx 10^10`
`1.0 xx 10^5`

ANSWER :C
Discussion
4806.

Which of the following will not exist

Answer»

`ICl_(3)`
`FCl_(3)`
`IF_(7)`
`BeF_(2)`

SOLUTION :Among interhlaogen compounds F- do not present as central ATOM due to high E.N. and absenceof d-orbitals.
Discussion
4807.

Which of the following element has f electro nic configuration in its + 4 state

Answer»

Ac
Bk
Er
Lv

Answer :B
Discussion
4808.

Which explains that O- nitrophenol is more volatile than p- nitrophenol:

Answer»

HYPER CONJUGATION
STERIC hindrance
Hydrogen bonding
Resonance

Answer :C
Discussion
4809.

Which of the following alloys does not contain zinc?

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The mixture USED in filling cavity in the tooth
Bronze
Brass
German Silver

Solution :Bronze is ALLOY of CU and SN
Discussion
4810.

To 500 "cm"^3 of water. 3.0 xx 10^(-3) kg of acetic acid is added. If 23% of acetic acid is dissociated, what will be the depression in freezing point. If k_f and density of water are 1.86 k "kg"^(-1) and 0.997 "gcm"^(-3)respectively

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0.186 K
0.228 k
0.372 k
0.556 k

ANSWER :B
Discussion
4811.

Which of the following is a ketohexose:

Answer»

Glucose
Fructose
Sucrose
Starch

Answer :C
Discussion
4812.

Which of following reaction does not give alkane?

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`R-MgX+H_(2)Orarr`
`R-MgX+HCNrarr`
`R-MgX+R-CNrarr`
`R-MgX+R-OHrarr`

ANSWER :C
Discussion
4813.

Which of the following groups will decrease the acidic strength of parent acid?

Answer»

`-OH`
`-CH_(3)`
`-OCH_(3)`
all.

Answer :D
Discussion
4814.

When zinc electrode and calomel electrode are coupled to form a cell , the cell emf is given as

Answer»

`E_(cell)^(0)=E_(Zn("ox"))-E_("Calomel"("RED"))^(0)`
`E_(cell)^(0)=E_("Calomel"("red"))^(0)-E_(Zn("ox"))^(0)`
`E_(cell)^(0)=E_("Calomel"("red"))^(0)-E_(Zn("ox"))^(0)`
`E_(cell)^(0)=E_(Zn("ox"))-E_("Calomel"("ox"))^(0)`

SOLUTION :`E_("Calomel(red)")^(0) GT E_(Zn("red"))^(0)`
Discussion
4815.

Which of the followinginnotnitrocompounds

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`C_(6)H_(5)- NO_(2)`
`(CH_(3))_(2) CH - NO_(2)`
`CH_(3) - O - N =O`
`(CH_(3))_(3)C - NO_(2)`

ANSWER :C
Discussion
4816.

Which of the alloys contains copper ?

Answer»

BELL metal
gun-metal
bronze
all of these

Answer :D
Discussion
4817.

Which of the following in not aromatic in nature?

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SOLUTION :`(a) IMPLIES` Aromatic
`(b) implies` Non aromatic, although `10PI OVERLINE(e)'s` system
`(C) implies` Aromatic
`(d) implies` Aromatic
Discussion
4818.

Which of the following compounds does not react with NaOH?

Answer»

`CH_(3)COOH`
`CH_(3)CONH_(2)`
`C_(6)H_(5)OH`
`CH_(3)CH_(2)OH`

Answer :D
Discussion
4819.

Which one of the followingore is bestconcentratedby froath - floatation method ?

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Magnetic
Hematite
Galena
Cassiterite

Answer :C
Discussion
4820.

Which of the following biphenyls is opticaly active?

Answer»




Solution :Ortho subsituted biphenyl are OPTICALLY active SINCE the rings donot lie in the same plane because of STERIC hindrance due to the presence of bulky GROUPS.
Discussion
4821.

Which of the following features are not shown by quartz glass?

Answer»

This is a crystalline solid. 
Refractive index is same in all the directions. 
This has definite heat of FUSION. 
This is also called super cooled LIQUID. 

Solution :Quartz GLASS is an AMORPHOUS solid and hence it will not have definite heat of fusion due to SHORT range order.
Discussion
4822.

Which will not show Frenkel defect?

Answer»

CsCl
Agl
AgBr 
ZNS 

ANSWER :A
Discussion
4823.

Which is the correct increasing order of boiling points of the following compounds ?1-Bromoethane, 1-Bromopropane, 1-Bromobutane, Bromobenzene

Answer»

Bromobenzene `LT` 1-Bromobutane `lt` 1-Bromopropapne `lt` 1-Bromoethane
Bromobenzene `lt` 1-Bromoethane `lt` 1-Bromopropane `lt` 1-Bromobutane
1-Bromopropane `lt` 1-Bromobutane `lt` 1-Bromoethane `lt` Bromobenzene
1-Bromoethane `lt` 1-Bromopropane `lt` 1-Bromobutane `lt` Bromobenzene

SOLUTION :Boiling point INCREASES with the increase in MOL. mass.
Discussion
4824.

Which is a mutual reduction reaction ? (A) KMnO_(4) + O_(3) ""(B) H_2O_2 + O_3 (C ) Ag_2O + O_3 ""(D) KI + H_2O +O_(3)

Answer»

A,B
A,C
A,D
B,C

Solution :Both the REACTANTS looses oxygen atoms
Discussion
4825.

Which of thefollowingcompoundgive methanamine on reduction ?

Answer»

HCN
HCHO
`CH_(3)CH`
HCOOH

Solution :`H- C -= N + 4(H) OVERSET(Na+C_(2)H_(5) -OH)to CH_(3) - NH_(2)`
Discussion
4826.

Which chloride is leastreaclivewith the hydrolysis point of view?

Answer»

`CH_(3)Cl`
`CH_(3)CH_(2)Cl`
`(CH_(3))_(3)CCl`
`CH_(2)=CH-Cl`

Solution :`underset("Vinyl CHLORIDE")CH_(2)*CH*Cl`
The halogen ATOM in vinyl chloride is not reactive as in other alkyl HALIDES. The non-reactivity of chlorine atom is DUE to resonance stabilisation. The e.p. on Cl-atom can participate in delocalisation (Resonance) to give two canonical structure.
Discussion
4827.

Which structural unit is possessed by aldehyde and not ketone:

Answer»

a- H atom
H-atom and CARBONYL group
OH and carbonyl group
None

Answer :B
Discussion
4828.

Which of the following is not an example of addition polymer?

Answer»

POLYSTYRENE
NYLON
PVC
Polypropylene

SOLUTION :Nylon is a CONDENSATION POLYMER
Discussion
4829.

Which of the following procedures would be best for achieving the following reaction

Answer»

I `NBS` in `C CI_(4)` and heat, ii `NaNO_(2)` III `KMnO_(4)` and heat
`KMnO_(4)` and heat ii `Br_(2)+FeBr_(3)` iii `HNO_(3)` and `H_(2)SO_(4)`
I `NBS` in `C CI_(4)` and heat ii `KMnO_(4)` and heat iii `HNO_(3)` and `H_(2)SO_(4)`
`Br_(2)+FeBr_(3) (ii) `KMnO_(4)` and heat (iii) `HNO_(3)` and `H_(2)SO_(4)` .

SOLUTION : .
Discussion
4830.

Which of the following oxidation states is common for all lanthanides?

Answer»

`+2`
`+3`
`+4`
`+5`

Answer :B
Discussion
4831.

Which of the following does not belong to same type of crystal?

Answer»

Quartz
SIC
IODINE
Diamond

Solution :Iodine is a MOLECULAR SOLID while all other quartz, SiC and diamond are covalent or network solids.
Discussion
4832.

Which of the following graphs represents a first order reaction ?

Answer»




ANSWER :B
Discussion
4833.

The spontaneous nature of a reaction is impossible if:

Answer»

`TRIANGLEH is +ve, TRIANGLES` is ALSO +ve
`triangleH` is -ve, `triangleS` is also -ve
`triangleH` is -ve, `triangleS` is +ve
`triangleH` is +ve, `triangleS` is -ve

Answer :D
Discussion
4834.

Which of the following statement is not correct about an inert electrode in a cell ?

Answer»

It does not PARTICIPATE in the CELL reaction.
It PROVIDES surface either for oxidation or for reduction reaction.
It provides surface for CONDUCTION of electrons.
It provides surface for REDOX reaction.

Answer :D
Discussion
4835.

Which of the following reacts less easily with sodium metal ?

Answer»

t-butyl alcohol
isopropyl alcohol
methyl alcohol
ETHYL alcohol

Solution :Due to the three methyl groups which are ELECTRON donating, the carbon atom bearing OH GROUP acquires partial negative charge, with the RESULT it pushes the electron pair to the O-H bond towards hydrogen and thus, hydrogen atom is firmly ATTACHED with the oxygen atom, hence it does not replace easily by sodium metal.
Discussion
4836.

The species present in Tollen's reagent is

Answer»

`[AG(NH_3)_4]^(+)`
`[Ag (NH_3)_2 ]^(+)`
`[Ag (NH_3)_3 `
`[Ag (NH_3) ]^(+)`

SOLUTION :Tollen.s reagentAmmonialsilverNitrate`[Ag (NH_3)_2]^(+)`
Discussion
4837.

Which of the followingcompoundreadilyundergoeselectrophilicsubstitution ?

Answer»

TOLUENE
NITROBENZENE
Anisole
Benzoicacid.

ANSWER :C
Discussion
4838.

Which of the following has most acidic proton :

Answer»

`CH_3COCH_3`
`(CH_3)_2C=CH_2`
`CH_3COCH_2COCH_3`
`(CH_3CO)_3CH`

ANSWER :C
Discussion
4839.

Which of the following aqueous solution has same osmotic pressure ?(i) 0.1 M NaCl solution(ii) 0.1 M glucose solution(iii)0.6 gm urea in 100 mL solution(iv) 1.0 gm non - volatile solute (x) in 50 mL solution. (Molecular Mass of x = 200)

Answer»

(i), (ii), (iii)
(ii), (iii), (iv)
(i), (ii), (iv)
(i), (iii), (iv)

SOLUTION :(ii) 0.1 M glucose `= pi=0.1` RT
(iii) `pi = (n)/(V)RT = ((0.6)/(60)xx1000)/(100)RT = 0.1 RT`
(iv)`pi=((0.1)/(200))/(50)xx1000 RT = 0.1 RT`
Discussion
4840.

Which of the following structures correspond to the product expected, when excess of C_(6)H_(6) reacts with CH_(2)Cl_(2) in presence of anhydrous AlCl_(3).

Answer»




SOLUTION :The REACTION TAKEN PLACE as FOLLOW :
Discussion
4841.

Which one is used in hair conditioner ?

Answer»

Anionic
CATIONIC
Non-ionic
All of the given

Solution :Cationic
Discussion
4842.

Whichofthefollowinghashighest electronegitivity ?

Answer»

Oxygen
Sulphur
Tellurium
Sellenium

Answer :A
Discussion
4843.

The solutionof (B) in HCl on treatment with the K_(4)[Fe(CN)_(6)] is gives a chocolate brown coloured precipitate of compound (E).

Answer»


Answer :`A = 2CuCO_(3).CU(OH)_(2), B=CuO,C=CO_(2), D=Du, E=Cu_(2)[Fe(CN)_(6)], F = Ca(HCO_(3))_(2)`. Azurite
Discussion
4844.

Which of the following is not a cellulose product ?

Answer»

GUN COTTON
Rayon
Dacron
Celluloid

ANSWER :C
Discussion
4845.

What is the basicity of orthophosphoric acid ? Write the types of salts formed by it.

Answer»

Solution :Orthophosphoric ACID, `H_(3)PO_(4)` has three `-OH` groups and its basicity is 3
`O=OVERSET(OH)overset("|")UNDERSET(OH)underset("|")"P "-OH`
Orthophosphoric acid, `H_(3)PO_(4)` forms three types of salts.
`H_(2).PO_(2)^(-)` is the anion of primary salt, an acidic salt. `HPO_(4)^(2-)` is the anion of secondary salt, an acidic salt. `PO_(4)^(3-)` is the anion of tertiary salt, normal salt.
Discussion
4846.

What is the IUPAC name of compound when -CHO group is attached to neomyl group ?

Answer»

2-methylpropanal
3-methylpropanal
2,2-dimethylbutanal
3,3-dimethylbutanal

Answer :D
Discussion
4847.

Which one of the following is formed on dissolving I_2 in aqueous solution of KI ?

Answer»

`KIO_4`
KIO
`KI_3`
`KIO_3`

ANSWER :C
Discussion
4848.

Which of the followingcannot be used for the preaparation of iodofrom ?

Answer»

ACETONE
METHANOL
ETHANOL
Acetealdeyde

Solution :NA
Discussion
4849.

Which element shows more pronounced inert pair effect ?

Answer»

Si
Sn
Pb
C

Answer :C
Discussion
4850.

Which of the following gases will have highest rate of diffusion ?

Answer»

`NH_(3)`
`N_(2)`
`CO_(2)`
`O_(2)`

ANSWER :A
Discussion