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4751.

triangleH for CaCO_3(s)rarrCaO(s)+CO_2(g) is 176 kJ mol^-1at 1240 K. The triangleUfor the change is equal to:

Answer»

160 kJ
165.6 kJ
186.3 kJ
180.0 kJ

Answer :B
Discussion
4752.

When (1R,2R)-1 2-Dibromo-1,2-diphenyl ethane is treated withalcoholic solution of KOH thev most probable product would be .

Answer»

TRANS-1,2diphenylethene
A MIXTURE of CIS trans alkenyl bromide
cis-alkenyl bromide
trans- alkenyl bromide

Solution : .
Discussion
4753.

Write four allotropic forms of sulphur.

Answer»

SOLUTION :The ALLOTROPIC forms of SULPHUR:
(i) Rhombic sulphur
(ii) MONOCLINIC sulphur
(iii) Colloidal sulphur
(iv) MILK of sulphur.
Discussion
4754.

What type of bonding helps in stabilising the a-helix structure of proteins?

Answer»

Solution :The `ALPHA` -helix structure of proteins is stabilised by INTRAMOLECULAR H-bonding between C-O of ONE AMINO acid RESIDUE and the N -H of the fourth amino acid residue in the chain.
Discussion
4755.

Which of the followig mixtures of ions in solubiotn can be separted by using dilute H_(2)SO_(4)?

Answer»

`Zn^(2+) and PB^(2+)`
`Ba^(2+) and Pb^(2+)`
`Mn^(2+) and SR^(2+)`
`Sr^(2+) and Ba^(2+)`

ANSWER :A::C
Discussion
4756.

The voltage of the cell Pb(s)|PbSO_(4)(s)|NaHSO_(4)(0.600M)||Pb^(2+)(2.50 xx 10^(-5)M)|Pb(s) is E = +0.061V. Calculate K_(2) = [H^(+)] [SO_(4)^(2-)]//[HSO_(4)^(-)] the dissociation constant for HSO_(4)^(-). Given Pb(s) +SO_(4)^(2-) rarr PbSO_(4) +2e^(-) (E^(@) = 0.356V),E^(@) (Pb^(2+)//Pb) =- 0.126V.

Answer»


ANSWER :`1.06 XX 10^(-2)`
Discussion
4757.

Which of the following is fluoroapatite

Answer»

`CaF_23Ca_(3)(PO_(4))_(2)`
`NaF 3Ca_(3) (PO_(4))_(2)`
`KF 3Ca_(3) (PO_(4))_(2)`
`Ca(OH)_(2) 3Ca_(3) (PO_(4))_(2)`

ANSWER :A
Discussion
4758.

Write the main structural difference between RNA and DNA of the fourbases, name those which are common to both RNA and DNA.

Answer»

Solution :DNA has double HELIX WHEREAS RNA has SINGLE helix.
The common bases are Adenine, Guanine and CYTOSINE.
Discussion
4759.

The specific heat of a bivalent metal is 0.16. the approximate equivalent mass of the metal will be:

Answer»

40
20
80
10

Answer :B
Discussion
4760.

Which of the following give (s) Schiff's base with aldehydes ?

Answer»

`CH_(3)-CH_(2)-NH_(2)`
`C_(6)H_(5)-CH_(2)-NH_(2)`
`C_(6)H_(5)-NH_(2)`
`C_(6)H_(5)-NO_(2)`

SOLUTION :with amines
Discussion
4761.

Which reagent will quantitatively distinguish between butyne-1 and butyne-2?

Answer»

`Br_2`
`AG(NH_3)_2`
`CU^(2+)`
`KMnO_4`

ANSWER :C
Discussion
4762.

What happens when some ethyl alcohol is added in the Nelson's cell and the cell is closed ?

Answer»

SOLUTION :The main products in the Nelson .s cell are chlorine and CAUSTIC soda .Ethyl alcohol is first oxidised with chlorine to acetaldehyde and then to chloral .
Chloral on BASE hydrolysis GIVES chloroform.
`C_(2)H_(5)OH+4Cl_(2)TOC Cl_(3)CHO+5HCl`
`C C_(3)CHO+NaOHtoHCOONa_CHCl_(3)`
Discussion
4763.

What product is formed when H_2S gasis passed through acidified KMnO_4 solution ?

Answer»

S
`K_2S`
`K_2SO_3`
`MnO_2`

SOLUTION :REACTION of `KMnO_4` in ACIDIC MEDIUM with `H_2S` GIVES S.
Discussion
4764.

Which of the following involves redox reaction?

Answer»

Decomposition of `CaCO_(3)`
Rusting
Reaction of NAOH with HCL
`Zn rarr Zn^(++)+2e^(-)`

ANSWER :B
Discussion
4765.

Which one of the statements given below concerning properties of solutions describes a colligative effect ?

Answer»

Boiling POINT of PURE water increases by the addition of common salt
Vapour pressure of pure water DECREASES by the addition of nitric acid
Vapour pressure of pure BENZENE decreases by the addition of naphthalene
Boiling point of pure benzene increases by the addition of toluene.

Answer :A::C
Discussion
4766.

Which among the following is most reactive to give nucleophilic addition?

Answer»

`FCH_(2)CHO`
`ClCH_(2)CHO`
`BrCH_(2)CHO`
`ICH_(2)CHO`

Solution :`FCH_(2)CHO` is most reactive towards nucleophilic addition SINCE presence of most electrophilic addition since presence of most ELECTRONEGATIVE F withdraws electronsfrom CARBON of carbonyl group making it more polar.
Discussion
4767.

The structure and hybridisation of Si(CH_3)_4 is:

Answer»

BENT, sp
Trigonal,`sp^2`
OCTAHEDRAL, `sp^3d`
TETRAHEDRAL,`sp^3`

ANSWER :D
Discussion
4768.

Vapour pressure of pure liquids P and Q are 700 and 450 mm Hg respectively at 330K. What is the composition of the liquid mixture at 330 K, if the total vapour pressure is 600 mm Hg?

Answer»

Solution :Vapour PRESSURE of the mixture = 600 mm HG
= 700 X mole fraction of P + 450 x mole fraction of Q = (700 x X) + 450(1-X) Mole fraction of component liquid, P = X = 0.6 Mole fraction of component liquid,
Q=1-X=0.4
Discussion
4769.

When fluoride is heated with conc. H_2 SO_4 and MnO_2 the gas evolved is

Answer»

`F_(2)`
SF
HF
None

ANSWER :C
Discussion
4770.

Which of the following correctly ranks the aryl halides in increasing order of reactivity towards sodium methoxide in methanol?

Answer»




ANSWER :C
Discussion
4771.

The reduction of an oxide by aluminium is called

Answer»

Beeyer's process
Godschmidt's aluminothermite process
Hall's process
van Arkel process

Answer :B
Discussion
4772.

Which of the following solution (s) is/are correct

Answer»

In contains weak acid and its conjugate BASE
In contains weak base and its conjugate acid.
It shows change in PH on ADDING small amount of acid or base
All of these

Solution :(a) A buffer solution is a solution which contains weak acid and its conjugate base. It is acidic buffer.
(b) Basic buffer contains weak base and its conjugate acid.
(c) Is wrong because it does not show change in pH on adding small amount of acid or base.
(d) Is wrong, all of the above statements are not correct.
Discussion
4773.

The resistance of a conductivity cell containing 0.001 M KCl solution at 298 K is 1500 Omega.What is the cell constant if conductivity of 0.001 M KCl solution at 298 K is 0.146 xx 10^(-3) S cm^(-1) ?

Answer»

SOLUTION :Cell constant =` ("Conductivity")/("CONDUCTANCE") = " Conductivity " xx"Resistance"`
`=0.146 xx 10^(-3) S cm^(-1) xx 1500 OMEGA`
`=0.129 cm^(-1)`
Discussion
4774.

Which reagent is used to remove SO_(4)^(2-) or CI^(Theta) from water

Answer»

`NaOH`
`PB(NO_(3))_(2)`
`BaSO_(4)`
`KOH`

SOLUTION :`PbSO_(4) and PbCI_(2)` are insoluble in COLD water
Discussion
4775.

Which of the following cyano complexes would exhibit the lowest value of paramagnetic behaviour? [At. Nos. Cr = 24, Mn= 25, Fe = 26, Co=27]

Answer»

`[Cr(CN)_(6)]^(3-)`
`[Mn(CN)_(6)]^(3-)`
`[FE(CN)_(6)]^(3-)`
`[Co(CN)_(6)]^(3-)`

Solution :`CN^(-)` is a strong FIELD ligand and causes pairing of metal ION:
Co(III) : `3d^(6) or t_(2g)^(6)`
Sinceit contains no unpaired ELECTRON, it is DIAMAGNETIC or least paramagnetic.
Discussion
4776.

wedge^(@)""_(m(HAc)) is equal to ……………

Answer»

`wedge_(m(AcH))^(@)+wedge_(m(KAC))^(@)+wedge_(m(NAAC))^(@)`
`wedge_(m(HCl))^(@)+wedge_(m(NaAc))^(@)-wedge_(m(NaCl))^(@)`
`wedge_(m(KCl))^(@)+wedge_(m(KAc))^(@)-wedge_(m(HCl))^(@)`
`wedge_(m(KCl))^(@)+wedge_(m(NaAC))^(@)-wedge_(m(NaCl))^(@)`

Answer :B
Discussion
4777.

Write the IUPAC names of the following alcohols from their bond line notations.

Answer»

SOLUTION :
Discussion
4778.

When kept in water, raisin swells in size. Name and explain the phenomenon involved with the help of a diagram. Givethree application of the phenomenon.

Answer»

Solution :The WALLS of raisin (partically dried grapes) conssist of semipermeable membrane. When kept in WATER, they swell as concentration INSIDE raisin is HIGH. The phenomenon is called 'osmosis'.
Discussion
4779.

Write the IUPAC names of the following complexes (i) [Co(NH_(3))_(5)CN][Co(NH_(3))(CN)_(5)] (ii) [Pt(Py)_(4)][PtCl_(4)] (iii) [Co(NH_(3))_(4)Cl_(2)]_(3)[Cr(CN)_(6)]

Answer»

SOLUTION :`(i) [Co(NH_(3))_(5)CN][Co(NH_(3))(CN)_(5)]`
Penta ammine cyanido `-KC ` Cobalt (III)
ammine penta cyanido - `KC` Cobaltate (III)
`(ii) [Pt(Py)_(4)][PtCl_(4)]`
TETRA pyridine plantinum (II) tetrachlorido platinate (II)
`(iii) [Co(NH_(3))_(4)Cl_(2)]_(3)[Cr(CN)_(6)]`
Tetraammine dichlorido cobalt (III) hexacyanido KC chromate (III)
Discussion
4780.

Total number of optically active isomers in [Pt(NH_(3))(H_(2)O)BrClIPy]^(+) when NH_(3)" and "H_(2)O are in trans position (opposite to each other)

Answer»


SOLUTION :
Discussion
4781.

When benzene diazonium chloride is treated with cuprous chloride and HCl the product formed is :

Answer»

Chlorobenzene
Benzene
Phenol
Chloroazobenzene

ANSWER :A
Discussion
4782.

The suitable for strong acid and weak base is

Answer»

Methyl orange
Methyl red
Phenol red
Phenolphthalein

Solution :Solution become ACIDIC and methyl orange ACT on acidic PH. Methyl red can also be used.
Discussion
4783.

Three atoms A, B and C crystallize in a cubic solid lattice where A atoms are present at the body centre, B atoms are present at the edge centre as well as at the corners of the cube and C atoms are present at the face centres of the cube. Now if all the atoms are removed from the two 4-fold axis and the one 2-fold axis passing through the cube, then the formula of the compound is

Answer»

`B_7 C_2`
`A B_2 C_7`
`ABC_2`
`A_5 C_2`

ANSWER :A
Discussion
4784.

Which elements of group 15 are metalloids ?

Answer»

N
As
Sb
Bi

Solution :A strong CONTINUOUS LAYER of oxide is formed on `FE, Cr` and `Al` when they react with `conc HNO_3`, hence they BECOME passive.
Discussion
4785.

Which of the following is a suboxide

Answer»

`Ba_(2)O`
`Pb_(2)O`
`C_(3)O_(2)`
`ZNO`

Answer :C
Discussion
4786.

Which of the following is not used as a pigment in paints ?

Answer»

lead dioxide
WHITE lead
lead CHROMATE
`Pb_(3)O_(4)`

Solution :Lead OXIDE is not used as pigment in paints.
Discussion
4787.

Write the balanced reaction of titration of KMnO_(4) vs ferrous ammonium sulphate in presence of H_(2)SO_(4).

Answer»

SOLUTION :`{:("REACTION :",2KMnO_(4)+10[FeSO_(4)(NH_(4))_(2)SO_(4).6H_(2)O]+8H_(2)SO_(4)rarr5Fe_(2)(SO_(4))_(3)+10(NH_(4))_(2)SO_(4)+K_(2)SO_(4)+2MnSO_(4)+68H_(2)O,,),("REDOX Changes :",Fe^(2+)rarrFe^(3+)+e""(E_(FeSO_(4))=(M)/(1)),,),(,Mn^(7+)+5erarrMn^(2+) "" (E_(KMnO_(4))=(M)/(5)),,),("Indicator :",KMnO_(4)" acts as self indicator",,),(,,,):}`
Discussion
4788.

The reagent used in Ruff degradation is :

Answer»

BAEYER's reagent
Tollen's reagent
FENTON reagent
Benedict's reagent

Answer :C
Discussion
4789.

Which ofthe following reaction isan exampleofcalcinationprocess ?

Answer»

` 2Ag +2HCL+ [O] TO2AG Cl +H_2 O `
`2 Zn+O_2to2 ZnO `
` 2 Zn S +3O_2to2 ZnO+2 SO _2`
` Mg CO_3toMgO+CO_ 2`

SOLUTION :Conversion of carbonateinto itsoxideby heatinginabsenceofair is calledcalcination.
Discussion
4790.

Which of the following will be completely or pariallydissolved in NH_(4)OH ?

Answer»

`AGCI`
`AgBr`
`BaSO_(4)`
`AgI`

SOLUTION :`AgCI` is completelysoluble white `AgBr` is is partially soluble in `NH_(4)OH`
Discussion
4791.

Which hydride is most stable ?

Answer»

CsH
NaH
KH
LiH

Answer :D
Discussion
4792.

The standard electrode potentials for thereactions Ag^(+)(aq)+e^(-)rarrAg(s) Sn^(2+)(aq)+2e^(-)rarrSn(s) at 25^(@)Care 0.80 V and -0.14 V respectively Theemfof the cell Sn|Sn^(2+)(1 M)|| Ag^(+)(1 M)|Agis

Answer»

0.48 V
0.80 V
1.08 V
0.94 v

Solution :EMF of the cell=0.80 V-(-0.14)V
=0.80 V+ 0.14 V=1.75 v`
Discussion
4793.

The red coloured compound formed during victor-Meyer.s test for ethyl alchol is :

Answer»


`CH_3CH_2NOH`

None

Answer :C
Discussion
4794.

Which of the following metal forms anode mud during electrolytic refining of copper ?

Answer»

Zn
Fe
Ag
Ni

ANSWER :C
Discussion
4795.

What is meant by rate of a reaction ? Differentiate between average rate and instantaneous rate of a reaction.

Answer»

SOLUTION :Rate of a reaction is defined as the change in concentration of reactant or product in a particular TIME interval.
Rate of reaction `= ("Change in concentration")/("Time taken")`
Discussion
4796.

What is the quantity of electricity (in columbs) required to deposit all the silver from 250mL of 1M AgNO_(3) solution ? (Ag=10R)

Answer»

2412.5
24125
4825
28250

Solution :Amount of AG in solution =MxxV (mL)
`=1xx250=250m ` mol
`=250xx10^(-3)` mol
`=250xx10^( -3)` mol
=0.25mol
`Ag^(+)+e^(-)rarrAg`
1 mol 96500C
REDUCTION of 1 mol of Ag requires 96500C
Reduction of 0.25 mol of Ag requires `=96500xx0.23=24125C`
Discussion
4797.

Whichof the followingshareslonepairof electronless easily ?

Answer»

methyl amine
BENZYLAMINE
aniline
deithyl amine

Solution :WEAK basecan sharelone pairof electronlesseasily . ANILINEIS weakbasethan other .
Discussion
4798.

The unit of van der Waals' constant 'b' is:

Answer»

`cm^3 MOL^(-1)`
LITRE `mol^-1`
`m^3 `mol^-1`
All of these

Answer :D
Discussion
4799.

The true statement for the acids of phosphorus H_(3)PO_(2), H_(3)PO_(3) and H_(3)PO_(4) is

Answer»

the order of their REDUCING strength is `H_(3)PO_(2) GT H_(3)PO_(3) gt H_(3)PO_(4)`
the hybridisation of PHOSPHORUS is `sp^(2)` in all these
The acidic strength order is `H_(3)PO_(2) gt H_(3)PO_(3) gt H_(3)PO_(4)`
All of these

Answer :A
Discussion
4800.

Write the structures of the following compounds (vi) 4-Fluoroacetophenone

Answer»


ANSWER :`(##ANE_PKE_CHE_XII_C12_E01_006_S01##)`
Discussion