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22501.

Which of the following structures correspond to the product expected, when excess of C6H6 reacts with CH_(2)Cl_(2) in presence of anhydrous AlCl_(3) ?

Answer»




ANSWER :D
Discussion
22502.

Which one of the following conformation of cyclohexane is the least stable

Answer»

Half-chair
Boat
Twisted-boat
Chair

SOLUTION :The half-chair can be attained by moving the carbons `C_(1), C_(2), C_(3)` and `C_(4)` of a chair conformation into one plane and `C_(6)` above the plane and `C_(5)` below the plane. It CONTAINS many ECLIPSED carbon-hydrogenbonds. The half chair conformer lies about 10.8 kcal above the chair FORM.
Discussion
22503.

Who pointed out peptide linkage in proteins:

Answer»

Kekule
Hofmann
Fisher
Cannizzaro

Answer :A
Discussion
22504.

Which metal alloy is used in design of aeroplane parts?

Answer»

Al
Zn
Cu
Au

Answer :A
Discussion
22505.

Writethe namesand structures ofthe monomers of the followingpolymers : (i) Nylon 6,6(ii)PHBV (iii) Neoprene.

Answer»

Solution :(i) Monomers of nylon 6,6 are .
`underset("Adipic acid")(HOOC(CH_(2))_(4)COOH) and underset("Hexamethylenediamine")(H_(2)N(CH_(2))_(6)NH_(2))`
(ii) Monomers of PHBV are .
`underset("3-Hydroxybutaonic acid")(CH_(3) - overset(OH)overset(|)(CH) - CH_(2) - COOH)` and ` underset("3-Hydroxpentanoic acid")(CH_(3)- CH_(2) - overset(OH)overset(|)(CH)- CH_(2) - COOH)`
(III) Monomers of neoprene are .
`underset("2-chloro-1, 3-butadiene")underset("Chloroprene")(CH_(2) = overset(Cl)overset(|)(C)- CH = CH_(2))` only
Discussion
22506.

Which of the following is most reactive towards Na metal

Answer»

`CH_3OH`
`C_2H_5 - OH`
`H_3C - oversetunderset(OH)(C)H -CH_3`

ANSWER :A
Discussion
22507.

Which of the following is a co-polymer ?

Answer»

Polypropelene
TERYLENE
PVC
Teflon

Solution :Terylene
Discussion
22508.

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

Answer»

Solution :Cell constant = Conductivity (or specific conductivity) `xx` Resistance.
`=0.146 xx 10^(-3) S CM^(-1) xx 1500 Omega`
`=0.219 cm^(-1)`.
Discussion
22509.

Which of the following will decrease the pH of a 50 mL solution of 0.01 M HCI?

Answer»

Addition of 5 ML of 1 M HCI
Addition of 50 mL of 0.01 M HCI
Addition of 50 mL of 0.002 M HCI
Addition of Mg

Solution :Additionof5m LOF 1 MHCIwill decrease the Ph , becauseonlythiswill INCREASE the `H^+`ionconcentrationin THESOLUTION .
Discussion
22510.

Which of the following does not show fac-mer isomerism ?

Answer»

`[CO(NH_(3))_(3)Cl_(3)]`
`[Co(dien)Cl_(3)]`
`[Co(en)_(3)]^(3+)`
All of these

Solution :
Discussion
22511.

Which is the weakest base :

Answer»




`CH_(3)NH_(2)`

ANSWER :A
Discussion
22512.

Write the structure of the molecule of a compound whose IUPAC name is 1 - phenylpropan -2- ol.

Answer»

Solution :`OVERSET(3)CH_(3)-overset(OH)overset("|")(""^(2)CH)-overset(1)CH_(2)-C_(6)H_(5)`
Discussion
22513.

What are the expected products of hydrolysis of lactose ?

Answer»

Solution :Lactose has molecular formula `C_(12)H_(22)O_(11)`. On hydrolysis, it GIVES EQUIMOLAR MIXTURE of D-glucose and D-galactose.
Discussion
22514.

Which is the correct structural formula of Aspirin ?

Answer»




ANSWER :C
Discussion
22515.

V.P. of pure solvent water is …. Than 2 M CuSO_(4) solution.

Answer»

LOWER
higher
same
can not be said

Solution :PURE LIQUID water has maximum VAPOUR pressure.
Discussion
22516.

The sodium salt of which acid will be needed for the preparation of propane by decarboxylation reaction ?

Answer»

`CH_(3)CH_(2)CH_(2)CH_(2)COOH`
`CH_(3)CH_(2)COOH`
`CH_(3)CH_(2)CH_(2)COOH`
`CH_(3)COOH`

ANSWER :C
Discussion
22517.

When 174.5 mg of octa atomic sulphur is added to 78 g of bromine, the boiling point of bromine is: [Given K_(b) for Br_(2) is 5.2 K mol^(-1) kg and boiling point of pure Br_(2) is 332.15K]

Answer»

415.23 K
310 K
220.92 K
332.19 K

ANSWER :D
Discussion
22518.

The structure the product formed on oxidation of phenol with chromic acid is

Answer»

(`AAK_MCP_36_NEET_CHE_E36_025_A01`)

ANSWER :C
Discussion
22519.

Which of the following is refined by the zone refining process ?

Answer»

CU
Zn
Ge
Sn

Answer :C
Discussion
22520.

Which of the following structures will show geometrical isomerism ?

Answer»

`CH_(3)CH="CC"I_(2)`
`CH_(3)-"CC"I=CBr-CH_(3)`
`CH_(3)CH=CHBr`
Ph-CH=N-OH

Solution :
Discussion
22521.

Which acid of each pair shown here would you expect to be stronger? (i) CH_3COOH, FCH_2COOH

Answer»


ANSWER :`FCH_2-COOH` (Presence of F having-I EFFECT STABILISES the carboxylate anion more)
Discussion
22522.

Which one of the following is wrongly matched.

Answer»

` [Cu(NH_3)_4]"" "Plumbate " `
` [Fe(CN)_6 ]^(3-) ""sp^(3)d^(2) `
` [Ni(CO)_4]"""nautral ligand " `
` [Fe (H_2O )_6]^(3+) """HIGH spin complex" `

Answer :B
Discussion
22523.

Which of the following is the most reactive towards nucleophilic substitution by NaOH

Answer»




SOLUTION : Rate of NUCLEOPHILIC substitution by NAOH INCREASES with increase of electron withdrawing group on benzene ring
Discussion
22524.

Which of the following is not an ore of iron ?

Answer»

MAGNETITE
SIDERITE
Cerussite
LIMONITE

ANSWER :C
Discussion
22525.

Write the valence shell electronic configuration of group - 15 elements.

Answer»

Solution :General electronic configuration of group 15 elements are `ns^(2)np^(3)`.
`{:("(i) Nitrogen",-,[He]ul(2l^(2))ul(2p^(3))),("(ii) Phosphorous",-,[Ne]ul(3s^(2))ul(3p^(3))),("(iii) ARSENIC",-,[Ar]ul(3d^(10))" "ul(4s^(ul2))ul(4p^(3))),("(iv) Antimony",-,[Kr]ul(4D^(10))" "ul(5s^(ul2))ul(5p^(3))),("(v) Bismuth",-,[Ne]4f^(14)5s^(10)ul(6S^(2))ul(6p^(3))):}`
Discussion
22526.

Which of the following acts as a leaving group?

Answer»

`OVERSET(theta)(O)H`
`Cl^(theta)`
`SO_(2)`
`E2`

SOLUTION :NA
Discussion
22527.

What is the role of these as food additives? Aspartame

Answer»

SOLUTION :ASPARTAME - ARTIFICIAL SWEETENING AGENT
Discussion
22528.

What are monomers ?

Answer»

Solution :Monomers are the REACTIVE simple molecules from which the repeating structural units of a polymer are DERIVED. For EXAMPLE, monomer of POLYTHENE is ethene and monomers of bakelite are phenol and formaldehyde.
Discussion
22529.

The weight of a molecule of a compound C_60H_122 is:

Answer»

`1.4 XX 10^(-21) g `
`1.09 xx 10^(-21) g `
`5.025 xx 10^23 g `
`16.023 xx 10^23 g `

Solution :Molecular MASS ` = 12 xx 60 + 1 xx 122 = 842 `
Wt. of MOLECULE ` = (842)/(6.022 xx 10^23)= 1.4 xx 10^(-21) `
Discussion
22530.

The root mean square velocity of a gas molecule at 100K and 0.5 atm pressure is 106.4 ms^(-1). If the temperature is raised to 400k and the pressure is raised to 2 atm, the root mean square velocity becomes

Answer»

<P>`106.4 ms^(-1)`
`425.6 ms^(-1)`
`212.8 ms^(-1)`
`851.2 ms^(-1)`

Solution :`C_(p ) -C_(V) =R` ( for MONOATOMIC GAS )
`:.C_(p ) = R + C_(v) = R + ( 3)/( 2) R = ( 5)/( 2) R `
Discussion
22531.

Which of the following are coloured?

Answer»

`CuSO_(4).5H_(2)O`
`NiSO_(4).7H_(2)O`
`CaCl_(2)`
`CO(NO_(3))_(2)`

ANSWER :A::B::D
Discussion
22532.

Which of the following is not an important constituent of cement ?

Answer»

CaO
`Al_(2)O_(3)`
MGO
`Na_(2)O`

Answer :D
Discussion
22533.

What is the name given to the solutions having the same osmotic pressure ?

Answer»

SOLUTION :ISOTONIC
Discussion
22534.

What are platinum metals ?

Answer»

Solution :The ELEMENTS of the SECOND and third triads of groups 8, 9 and 10, i.e., Ru, Rh, Pd, OS, Ir and Pt are called platinum metals.
Discussion
22535.

What isthe solubilty product of CaF_2,if its satuated solution contains 0.017 g of CaF_2per litre ?

Answer»

`1.44xx10^(-4)`
`4.14xx10^(-11)`
`4.14xx10^(-18)`
`41.4xx10^(-24)`

Answer :B
Discussion
22536.

"What is the ratio of the solubilities of "N_(2)"and" O_(2)"in"H_(2)O "at" 373 "K, given that "K_(H)(N_(2))=12.6xx10^(4)" atm and "K_(H)(O_(2)) =7.01xx10^(4)? "Assume that" p(N_(2))=0.80 "atm and" p(O_(2))=0.20 atm

Answer»

Solution :The ratio of the solubilities of the gases can be EXPRESSED in terms of their mole fractions. Accrding toHenry's low,
`x_((N_(2)))=(p_((N_2)))/(K_(H(N_2)))=((0.80 ATM))/((12.6xx10^(4)atm)`
`x_((O_(2)))=(p_((O_2)))/(K_(H(O_2)))=((0.20 atm))/((7.01xx10^(4)atm)`
`x_(N_2)/x_(O_2)=((0.80atm))/((12.6xx10^(4)atm))XX((7.01xx10^(4)))/((0.20 atm))=2.22`
Discussion
22537.

When a mixture of calcium benzoate and calcium acetate is dry distilled, the resulting comound is

Answer»

acetophenone
benzaldehyde
benzophenone
Acetaldehyde.

Solution :Nucleophilic ATTACK by labelled `("CL O"^(18))` METHANOL with produce labelled ester.
Discussion
22538.

Which of the following compounds has the largest lattice energy ?

Answer»

1. LiBr
2. LiCl
3. LiF
4. LiI

Answer :C
Discussion
22539.

When excess ammonia gas is passed through aq CrCl_3 solution, complexes A and B are formed. Complex A gives 2 particles and complex B gives 4 charges. Write the formula of complexes.

Answer»

Solution :Complex A gives two ions, in which ONE is complex ion and other is chloride. Formula of the complex, A is `[Cr(NH_3)_4Cl_2]Cl`. Complex B gives CATION with two charges and ANIONS with total of two charges. Formula of the complex B is `[Cr(NH_3)_5Cl]Cl_2`
Discussion
22540.

Which of the following is most dense

Answer»

Fe
Cu
B
PB

Solution :Out of the GIVEN FOUR CHOICES, Pb is the most DENSE.
Discussion
22541.

Which is correct ?

Answer»

Langmuir adsorption is highly specific
van DER WAALS' adsorption is reversible
Both (a) and (B)
All

Answer :D
Discussion
22542.

What is the outer shell electronic configuration of the chalcogens ?

Answer»

Solution :`ns^(2)np^(4)` where n (2-6) is the NUMBER of the OUTERMOST SHELL of the chalcogens.
Discussion
22543.

Zinc reacts with conc. H_2SO_4 to produce:

Answer»

`ZnSO_4`
`ZnCO_3`
Zn
None

Answer :A
Discussion
22544.

Which metal cannot be extracted by carbon reduction process?

Answer»

Pb
Al
Hg
Zn

Answer :B
Discussion
22545.

White phosphorous (P_4) has :

Answer»

Six P - P singlebond
FOUR P - P SINGLE bond
Four lone PAIRS of ELECTRONS
PPP ANGLE of `60^@`

Solution :
Discussion
22546.

Which of the following elements has the smallest atomic size :

Answer»

Cs
F
Na
Cl

Answer :B
Discussion
22547.

Which of the following statement are true regareding interhalogens:

Answer»

(A) Thermal stability order IF gt BrF gt CIF
(B) HYDROLYSIS of `IF_7` PRODUCES `H_5IO_6` and HF as products.
(C) Interhalogen compounds are diamagnetic in nature.
`IF_7` have pentagonal bipyramidal structure

Answer :A::B::C::D
Discussion
22548.

When conc. H_(2)SO_(4) was added into an unknown nitrate salt present in a test-tube, a brown gas (A) was evolved. This gas intensified when copper turnings were also added into this test-tube. On cooling, the gas (A) changed intocolourless gas (B). (a) Identify the gases (A) and (B). (b) Write the equations for the reactions involved.

Answer»

Solution :When a nitrate salt is heated with conc. `H_(2)SO_(4)`, vapours of `HNO_(3)` are first produced which undergo decomposition to produce nitrogen dioxide `(NO_(2))` which is a BROWN gas (A) When Cu turnings are added, the gas (A) intensified due to the reduction of `HNO_(3)` by Cu.
`underset("sod. nitrate")(2NaNO_(3))+H_(2)SO_(4) overset("Heat")(rarr) underset(("Colourless"))underset("Nitric acid")(2HNO_(3))+Na_(2)SO_(4)`
`4HNO_(3) overset("Heat")(rarr) underset(("Brown gas A"))underset("Nitrogen dioxide")(4NO_(2)) + O_(2)+2H_(2)O`
`underset("Copper turnings")(CU) + 4HNO_(3) overset("Heat")(rarr) Cu(NO_(3))_(2) + underset("Nitrogen dioxide (A)")(2NO_(2))+2H_(2)O`
`NO_(2)` is an odd electron species (7 + 8 + 8 = 23 electrons). In the valence SHELL, it has only 7 electrons and hence is less stable. To become morestable by having 8 electrons in the valence shell, it undergoes dimerization to form a colourless gas, `N_(2)O_(4)`

Thus, (A) is nitrogen dioxide `(NO_(2))` and (B) is dinitrogen tetroxide `(N_(2)O_(4))`.
Discussion
22549.

When a salt of strong base and Weak acid is hydrolysed the resulting solution has :

Answer»

PH=7
PH=0
PHlt 7
PHgt7

Answer :D
Discussion
22550.

Write the cell representation of the galvanic cell in which the following reaction take place " "Zn_((s))+CuSO_(4) rarr ZnSO_(4)+Cu_((s)) For the above cell. Identify the anode and cathode half cell.

Answer»

Solution :The galvanic cell is represented as
`""Zn_((s))ABS(Zn_((aq))^(2+))abs(Cu_((aq))^(2+))Cu_((s))`
The anode half cell is `Zn_((s))|Zn_((aq))^(2+)`
The CATHODE half cell is `Cu_((aq))^(2+)|Cu_((s))`
Discussion