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26651.

The number of pi-bonds and sigma-bonds present in naphthalene are respectively

Answer»

5,19
6,19
5,20
5,11

Solution :No .of `PI` BONDS =5
No.of `DELTA` bonds =19
Discussion
26652.

The ore after concentration is found to have basic impurities. Which of the following can be used as flux ?

Answer»

`MgO`
`CaCO_3`
`FeO`
`SiO_2`

Solution :`SiO_2` acts as ACIDIC FLUX. Hence, used for REMOVAL of BASIC IMPURITIES.
Discussion
26653.

The order of the reactivity of hydrogen in isopentane is :

Answer»

`1^@=2^@gt3^@`
`1^@GT2^@gt3^@`
`3^@gt1^@gt2^@`
`3^@gt2^@gt1^@`

ANSWER :D
Discussion
26654.

The ordinary alkyl ethers are cleaved by-

Answer»

Ethanol
Ethyl HALIDE
`BF_(3)`
HYDROGEN iodide

Answer :D
Discussion
26655.

The number of photons of light having wave number x in 1J of energy source is (Plank's constant=h, velocity of light =c)

Answer»

hcx
hc/X
`x/(hc)`
`1/(hcx)`

Solution :ENERGY of PHOTON `=hv=(hc)/(lamda)` or `hc.barv=hcx`
No. of PHOTONS in `1J=1/(hcx)`
Discussion
26656.

The number of photons emitted per second by a 60 watt source of monochromaticlight of wavelength 663 nm is (h=6.63xx10^(-34)Js)

Answer»

`4xx10^(-20)`
`1.5xx10^(20)`
`3XX10^(-20)`
`2XX10^(20)`

Solution :Energy of one photon `E=hv=(HC)/(lamda)`
`=(6.63xx10^(-34)xx3.0xx10^(8))/(663xx10^(-9))`
NO. of PHOTONS `=60/((6.63xx10^(-34)xx3.0xx10^(8))/(663xx10^(-9)))`
`=(60xx663xx10^(-9))/(6.63xx10^(-34)xx3.0xx10^(8))=2xx10^(20)`
Discussion
26657.

The order of the reaction occuring by following mechanism should be (i) A_(2) to A + A (fast ) "" (ii) A+ B_(2) to AB + B (Slow ) (iii) A + B to (Fast)

Answer»

`1 (1)/(2)`
`3(1)/(2)`
2
None of these

Solution :The rate will be given by slowest step . THUS r = k`[A][B_(2)] , K_(C) = ([A][A])/([A_(2)]) ` or [A] = `[K_(c)]^(1//2) [A_(2)]^(1//2)`
`r = K xx [K_(c)]^(1//2) [A_(2)]^(1//2) [B_(2)] = k[A_(2)]^(1//2) [B]`. Thus order is
0.5 + 1 = 1.5.
Discussion
26658.

The number of phases in a colloidal system is -

Answer»

1
2
3
4

Answer :B
Discussion
26659.

The order of the reaction 5" Br"^(-)(aq)+BrO_(3)^(-)(aq)+6" H"^(+)(aq)to3" Br"_(2)(aq)+7" H"_(2)O(l) is

Answer»


Solution :RATE LAW EQUATION for the GIVEN reaction is
Rate `=[Brbar][BrO_3bar][H^+]^2`
HENCE, overall order of the reaction is 4
Discussion
26660.

The number of photons emitted in 10 hours by 60 W sodium lamp (lambda= 5893 Å) is about :

Answer»

`6.4 XX 10^20`
`6.4 xx 10^24`
`3.2 xx 10^24`
`1.4 xx 10^22`

ANSWER :B
Discussion
26661.

The order of the oxidation state of the phosphorus atom in H_(3)PO_(2), H_(3)PO_(4), H_(3)PO_(3) and H_(4)P_(2)O_(6) is

Answer»

<P>`H_(3)PO_(4) GT H_(3)PO_(2) gt H_(3)PO_(3) gt H_(4)P_(2)O_(6)`
`H_(3)PO_(2) gt H_(3)PO_(3) gt H_(4)P_(2)O_(6) gt H_(3)PO_(4)`
`H_(3)PO_(3) gt H_(3) PO_(2) gt H_(2)PO_(4) gt H_(4)P_(2)O_(6)`
`H_(3)PO_(4) gt H_(4)P_(2)O_(6) gt H_(3)PO_(3) gt H_(3)PO_(2)`

SOLUTION :`H_(3)overset(+5)(PO)_(4) gt H_(4)overset(+4)(P_(2))O_(6) gt H_(3)overset(+3)(PO)_(3) gt H_(3)overset(+1)(PO)_(2)`
Discussion
26662.

The number of peroxy bonds in H_3PO_5 is 'X' . What is the value of 'X' ?

Answer»

SOLUTION :X = 1 = peroxy BODS
Discussion
26663.

The order of the reaction: A + B to Cis 1 with respect to each of the reactants. Find the approximate concentration of A remaining after 100 seconds if its initial concentration is 0.1 M and that of B is 6 M. Rate constant of the reaction is 5 xx 10^(-3) M^(-1) s^(-1)

Answer»

SOLUTION :`4.96 XX 10^(-3) M`
Discussion
26664.

The number of phases in a colloidal system is:

Answer»

1
2
3
4

Solution :NUMBER of PHASES in COLLOIDAL SYSTEM are TWO.
Discussion
26665.

The number of periods in the long form of the periodic table is:

Answer»

SEVEN
Nine
Eighteen
As MANY as groups.

Answer :A
Discussion
26666.

The order of the nucleophilicity of F^(-) ,Cl^(-), Br^(-) and I^(-) in protic solvents is

Answer»

`F^(-) GT I^(-) gt CL^(-) gt BR^(-)`
`F^(-) gt Cl^(-) gt Br^(-) gt I^(-)`
`I^(-) gt Br^(-) gt F^(-) gt Cl^(-)`
`I^(-) gt Br^(-) gt Cl^(-) gt F^(-)`

ANSWER :D
Discussion
26667.

The order of susceptibility of nucleophilic attack on aldehydes follows the order

Answer»

`1^(@) gt 3^(@) gt 2^(@)`
`1^(@) gt 2^(@) gt 3^(@)`
`3^(@) gt 2^(@) gt 1^(@)`
`2^(@) gt 3^(@) gt 1^(@)`

Solution :`R-overset(+delta)underset(O)underset(||)(C )-H,` Susceptibility of nucleophilic attack on ALDEHYDE is decreased by elecron releasing effect of R GROUP. Decreasing order of aldehyde TOWARDS nucleophilic attack is `1^(@) gt 2^(@) gt 3^(@) R` group.
Discussion
26668.

The number of peptide bonds presents in tetrapeptide is

Answer»

2
5
3
4

Answer :C
Discussion
26669.

The order of strength of hydrogen bonds is

Answer»

`H_2N-HcdotsNH_3gtHO-HcdotsOH_2gtF-HcdotsF-H`
`H_2N-HcdotsNH_3ltHO-HcdotsOH_2ltF-HcdotsF-H`
`H_2N-HcdotsNH_3gtF-HcdotsF-HgtHO-HcdotsOH_2`
`H_2N-HcdotsNH_3ltHO-HcdotsOH_2gtF-HcdotsF-H`

ANSWER :B
Discussion
26670.

The order of stability of the following tautomeric compounds is underset((I))(CH_(2)=overset(OH)overset(|)(C)-CH_(2)-overset(O)overset(||)(C))-CH_(3)hArr underset((II))(CH_(3)-overset(O)overset(||)(C)-CH_(2)-overset(O)overset(||)(C))-CH_(3)hArr underset((III))(CH_(3)-overset(OH)overset(|)(C)=CH -overset(O)overset(||)(C)-CH_(3))

Answer»

`II gt III gt I`
`I gt II gt III`
`III gt II gt I`
`II gt I gt III`

Solution :STABILITY ORDER is
Discussion
26671.

The number of pentyl alcohols producing blue colouration in the Victor-Meyer'stest is

Answer»


Solution :`2^(@)` Alcohols give blue colouration in Victor-Meyer's TEST due to the formation of pseudonitrole . The THREE `2^(@)` alcohols are:
`CH_(3)CH_(2)CH_(2)-CHOH -CH_(3)`
`CH_(3)CH_(2)-CHOH -CH_(2)CH_(3)`
`CH_(3)-underset(CH_(3))underset(|)CH-underset(OH)underset(|)CH-CH_(3)`
Discussion
26672.

The order of stability of the following tautomeric forms is-

Answer»

`IIgtIIIgtI`
`IgtIIgtIII`
`IIIgtIIgtI`
`IIgtIgtIII`

SOLUTION :
Discussion
26673.

The number of pentyl alcohols producing blue colouration in the Victor-Meyer's test is.

Answer»


Solution :`2^(@)` ALCOHOLS give blue COLOURATION in Victor-Meyer's test due to the formation of pseudonitrole. The three `2^(@)` alcohols are: (ii), (III) and (viii).
Discussion
26674.

The number of pentyl alcohols producing blue colouration in the Victor-Meyer's test is .

Answer»


ANSWER :3
Discussion
26675.

The number of paramagentic species among the following is O_(2), CO, N_(2), C_(2), CsO_(2), BaO_(2), CO_(2)

Answer»


ANSWER :2
Discussion
26676.

The order of stability of the following tautomeric compound is I. CH_(2)=overset(OH)overset("|")"C "-CH_(2)-overset(O)overset(||)C-CH_(3) II. CH_(3)-overset(O)overset(||)C-CH_(2)-overset(O)overset(||)C-CH_(2) III. CH_(3)-overset(OH)overset("|")"C "=CH-overset(O)overset(||)C-CH_(3)

Answer»

I gt II gt III
III gt II gt I
II gt I gt III
II gt III gt I

Solution :The `BETA`- dicarbonyl compounds are more stable because of conjugation and intramolecular H-bonding THUS, the order of stability is
Discussion
26677.

The order of stability of the following carbocations : is

Answer»

`IIgtIIgtI`
`IIgtIIIgtI`
`IgtIIgtIII`
`IIIgtIgtII`

ANSWER :D
Discussion
26678.

The number of paired and unpaired electrons in the valence shell of the members of oxygen family are

Answer»

4 and 2
2 and 4
3 and 4
2 and 3

ANSWER :A
Discussion
26679.

The order of stability of carbonium ions is

Answer»

METHYL`gt` ETHYL `gt` iso-propyl `gt` tert-butyl
Tert-butyl `gt` iso-propyl `gt` ethyl `gt` methyl
Iso-propyl `gt` tert-butyl `gt` ethyl `gt` methyl
Tert-butyl `gt` ethyl `gt` iso-propyl `gt` methyl

Solution :`{:(""CH_(3)),(""|),(CH_(3)-C^(+) gt CH_(3) -OVERSET(+)(CH)gt CH_(3)overset(+)CH_(2) gt overset(+)CH_(3)),(""|""|),(""CH_(3)""CH_(3)),(""3^(@)""2^(@)""1^(@) ""{:("Methyl"),("Carbonium ION"):}):}`
Discussion
26680.

The number of P rarr Oor P = O and P - O - H bonds in H_3PO_4 are :

Answer»

3,1
2,2
1,2
1,3

Solution :`{:(OH,P-O-" BONDS is one (1)"),(" "|,),(HO-P-OH,"P - O- HBONDS is three(3)"),(" "|,),(OH,):}`
Discussion
26681.

The order of stability of metal oxides is

Answer»

`Cr_(2)O_(3)ltMgOltAl_(2)O_(3)ltFe_(2)O_(3)`
`Fe_(2)O_(3)ltCr_(2)O_(3)ltAl_(2)O_(3)ltMgO`
`Fe_(2)O_(3)ltAl_(2)O_(3)ltCr_(2)O_(3)ltMgO`
`Al_(2)O_(3)ltMgOltFe_(2)O_(3)ltCr_(2)O_(3)`

SOLUTION :As stability is directly related to LATTICE energy and lattice energy depends on CHARGE and size of ions. So, the order is:
`Fe_(2)O_(3)ltCr_(2)O_(3)ltAl_(2)O_(3)ltMgO`
Discussion
26682.

Write the order of stability of carbanions ?

Answer»

`CH_3^(-)gt 1^@gt2^@GT3^@`
`3^@gt2^@gt1^@gtCH_3^-`
`3^@gt1^@gt2^@gtCH_3^-`
`2^@gt3^@gt1^@gtCH_3^-`

ANSWER :A
Discussion
26683.

The number of P-P bonds in cyclotrimeta phosphoric acid is

Answer»

3
9
6
zero

ANSWER :4
Discussion
26684.

The order of reactivity of the following alcohols towards HCl is __________. (i) F-CH_2-overset(OH)overset(|)CH-CH_3 (ii) F-CH_(2)-CH_2-overset(OH)overset(|)CH-CH_3 (iii) H_3C-overset(OH)overset(|)CH-CH_3 (iv) H_5C_6-CH_2OH

Answer»

`IGT II GT iii gt iv `
`igt iii gt ii gt iv `
`ivgt iii gt ii gt I `
`iv gt iii gt

ANSWER :C
Discussion
26685.

The number of P-OH bonds in diphosphoric acid, orthophosphoric acid, pyrophosphorous acid and phophorous acid are respectively :

Answer»

4, 3, 4, 2
4, 3, 2, 2
4, 2, 3, 2
4, 2, 4, 2

Answer :B
Discussion
26686.

The order of reactivity of the alkenes, underset((I))((CH_(3))_(2)C-=CH_(2)),underset((II))(CH_(3)CH=CH_(2)),underset((III))(CH_(2)=CH_(2)) when subjected to acid catalysed hydration is

Answer»

IgtIIgtIII
IgtIIIgtII
IIIgtIIgtI
IIgtIgtIII

Solution :As the number off `CH_(3)` groups INCREASES, ELECTRON density in the double bond increases and hence the REACTIVITY increases, i.e., IgtIIgtIII.
Discussion
26687.

The number of P-O-P bonds in cyclic metaphosphoric acid is

Answer»


ANSWER :3
Discussion
26688.

The number of P-O-P bonds in the structure of phosphorus pentoxide and phosphorus trioxide are respectively:

Answer»

6, 6
5, 5
5, 6
6, 5

ANSWER :A
Discussion
26689.

The order of reactivity of the alkenes : underset((I))((CH_(3))_(2)C=CH_(2)),""underset((II))(CH_(3)CH = CH_(2)),""underset((III))(CH_(2) = CH_(2)) When subjected to acid catalysed hydration is :

Answer»

`I GT II gt III`
`I gt III gt II`
`III gt II gt I`
`II gt I gt III`

ANSWER :A
Discussion
26690.

The order of reactivity of : phi-CH_(3) (I),phi-CH_(2)-CH_(3) (II),andphi-C(CH_(3))_(3) (IV) Where phi=C_(6)H_(5)

Answer»

`IgtIIgtIIIgtIV`
`IVgtIIIgtIIgtI`
`IIgtIgtIIIgtIV`
`IIIgtIIgtIgtIV`

Solution :More are the number of `alpha-`hydrogen present in the alkyl group attached to the benzene ring more PRONOUNCED will be the hyperconjugation and the benzene ring will be more electron rich and easily be attacked by an electrophile. `alpha-`hydrogen in `-CH_(3), -CH_(2)-CH_(3),-CH(CH_(3))_(2)` respectively are three, two ONE and ZERO.
Discussion
26691.

The number of P - O - P bonds in the structure of phosphorus pentoxide and phosphorus trioxide are respectively.

Answer»

6, 6
5, 5
5, 6
6, 5

Answer :A
Discussion
26692.

The order of reactivity of tghe following alcohols towards HCI is

Answer»

I gt II gt III gt IV
I gt III gt II gt IV
IV gt III gt II gt I
IV gt III gt I gt II.

Solution :The order of reactivity depends UPON cyclohexenol of the carbocationformed

The presence of electron-withdrawing intensfies i.e. DESTABILIZES the carbocation THUS (i) and (ii) one less STABLE than (iii). Further (i) is less stable than (ii) because -I effect is more pronounced in (i) due to less distance between F and +charge. Thus stability order of the FOUR carbocations and the reactivity of their parent alcohls will be IV gt III gt II gt I.
Discussion
26693.

The number of P-O-P bonds in cyclic meta phospharic acid is

Answer»

0
2
3
4

Solution :`(HPO_3)` is CALLED cyclic METAL PHOSPHORIC ACID

No. of P - O - P Linkages = 3
`3-sp^3` - Hybridised phosphorous atoms
Discussion
26694.

The order of reactivity of phenyl magnesium bromide with the following compound is (I)Acetone(II) Acetaldehyde(III)Acetophenone(IV)Benzonphenone

Answer»

`I gt II gt III gt IV`
`II gt I gt III gt IV`
`IV gt III gt II gt I`
`III gt IV gt I gt II`

Solution :`UNDERSET("of chalcopyrite")underset("AQUEOUS solutionobtained on leaching")ubrace(CuSO_(4)(AQ)+FeSO_(4)(aq))+ZnrarrZnSO_(4)+underset("as impurity")underset("Iron is ALSO obtained")ubrace(Fedarr+Cudarr)`
Discussion
26695.

The number of P-O-P bonds in cyclic metaphosphoric acid is:

Answer»

Zero
Two
Three
Four

Answer :C
Discussion
26696.

The order of reactivity of halogens with Hydrogen is

Answer»

`F_(2)ltCl_(2)ltBr_(2)ltI_(2)`
`F_(2)gtCl_(2)gtBr_(2)gtI_(2)`
`F_(2)ltBr_(2)ltCl_(2)ltI_(2)`
`F_(2)gtI_(2)gtBr_(2)gtCl_(2)`

Answer :B
Discussion
26697.

The number of P= O bonds in P_4O_10 are

Answer»

2
3
4
5

Answer :C
Discussion
26698.

The order of reactivity of following alkyl halidestowards S_N1 reaction is (i)(CH_3)_3CBr , (ii)(C_6H_5)_2CHBr, (iii)(C_6H_5)_2C(CH_3)Br , (iv)(CH_3)_2CHBr , (v)C_2H_5Br

Answer»

`(v)GT (IV)gt (i) gt(ii) gt (III)`
`(ii) gt (i) gt (iii) gt (v) gt (iv)`
`(i) gt (iii) gt (v) gt (ii) gt (iv)`
`(iii) gt (ii) gt (i) gt (iv) gt (v)`

ANSWER :D
Discussion
26699.

The number of P-H bonds hypophosphorous acid is :

Answer»

1
2
3
4

Answer :B
Discussion
26700.

The order of reactivity of halides with amines is

Answer»

`RI GT RBR gt RCL`
`RBr gt RI gt RCl`
`RCl gt RBr gt RI`
`RBr gt RCl gt RI`

ANSWER :A
Discussion