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14801.

Which of the following processes can be used to prepare polystyrene ?

Answer»

ANIONIC
CATIONIC
Free radical
Ziegler-Natta

ANSWER :A::B::C::D
Discussion
14802.

Which one of the following is wrongly matched

Answer»

SAPONIFICATION of `CH_(3)COOC_(2)H_(5)` - Second ORDER REACTION
Hydrolysis of `CH_(3)COOCH_(3)` - First order reaction
Decomposition of `H_(2)O_(2)`- First order reaction
Combination of `H_(2)` and `Br_(2)` to give HBr- Zero order reaction

Solution :`H_(2) + Br_(2) hArr 2 HBr ` is a 1.5 order reaction
i.e, `k= [H_(2)][Br_(2)]^(1//2)` .
Discussion
14803.

Which of the following is less acidic in nature ?

Answer»




ANSWER :D
Discussion
14804.

Which of the following bases is not present in DNA?

Answer»

Adenine
Guanine
Cytosine
URACIL

Solution :Uracil is PRESENT in only RNA
Discussion
14805.

Which one of the following is used as a coagulating agent for rubber latex?

Answer»

ETHANOYL chloride
Butanoic ACID
Methanoic acid
BENZOIC acid

Solution :Methanoic acid
Discussion
14806.

What happens when potassium ferrocyanide solution is added to a ferric salt solution ?

Answer»

Solution :A PRUSSIAN blue COLOUR complex (ferri-ferrocyanide) is FORMED.
Discussion
14807.

Which defines the standard reduction electrode potential of Zn^(2+) ions :

Answer»

`ZN^(2+)(aq)+2erarrZn(s),[Zn^(2+)]=1 M`
`Zn(g) rarrZn^(2+) +2E,[Zn^(2+)]=1M`
`Zn6(2+)(aq)rarrZn(s)+2e,[Zn^(2+)]=1M`
`Zn^(2+)(g) rarrZn(s)-2e,[ZN^(2+)]=1M`

ANSWER :A
Discussion
14808.

Which of the following pairs of xenon compounds and their structure are correctly matched? 1) XeF_4………….. Tetrahedral 2) XeO_3 ……………. Trigonal pyramidal 3) XeOF_4 ………… Square pyramidal 4) XeO_4 ……………. Tetrahedral Select the correct answer using the codes given below : Code :

Answer»

1,2,3 and 4
2, 3 and 4
1 and 3
3 and 4

SOLUTION :1)` XeF_4`………… SQUARE PLANNER
2) `XeO_3` ………….. PYRAMIDAL
Discussion
14809.

Which is non-polar?

Answer»

`H_2S`
NASH
`CL _2`
`H_2SO_4`

ANSWER :C
Discussion
14810.

Treatment of (+)- glucose with HIO_(4) gives results that confirm its aldohexose structure. What product should be formed, and how much HIO_(4) should be consumed.

Answer»

Solution :SINCE in glucose there are five `-Oll` GROUPS so five moles of `HlO_(4)` are consumed giving main product FORMIC ACID and formaldehyde as shown below :
`"Glucose"+5HlO_(4) to 5HCOOH+HCHO`.
Discussion
14811.

The structure of B_(3)N_(3)H_(6) is as follows: How may derivations structures of B_(3)N_(3)H_(4)X_(2) can be derived from the basic structure, by the replacement of two hydrogen atoms?

Answer»

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

SOLUTION :
Discussion
14812.

The wave number of the spectral line in the emission spectrum of hydrogen will be equal to 8/9 times the Rydberg's constant if electron jumps from

Answer»

A) `n=3` to `n=1`
B) `n=10` to `n=1`
C) `n=9` to `n=1`
D) `n=2` to `n=1`

SOLUTION :ACCORDING to Rydberg.s formula
`vec(V)=R[(1)/(n_(1)^(2))-(1)/(n_(2)^(2))]Z^(2)`
If `vec(v)=8/9R`
then `n_(1)` should be equal to 1
and `n_(2)` should be equal to 3
i.e., `vec(v)=R[(1)/(1^(2))-(1)/(3^(2))](1)^(2)`
`vec(v)=R[(9-1)/(9)]=(8)/(9)R`
Discussion
14813.

Write equations of the following reactions : (i) Friedel - Crafts reaction - alkylation of anisole. (ii) Nitrationof anisole. (iii) Bromination fo anisole in ethanoic acid medium.

Answer»

Solution :(i) Friedel - Crafts reaction - alkylation of anisole

(ii) Nitration of anisole

(III) Bromination of anisole in ethanoic acid medium

p - PRODUCT is obtained in PREFERENCE due to less steric HINDRANCE.
(iv) Friedel - Crafts ACETYLATION of anisole
Discussion
14814.

The yellow colour in NaCl crystal is due to ……………….. .

Answer»

EXCITATION of ELECTRONS in F CENTERS
reflectionof light from `Cl^(-)` ion on the surface
refraction of light from `Na^(+)` ion
all of the above

Solution :excitation of electrons in F centers
Discussion
14815.

Two solid A and B are present in two different container having same volume and same temperature following equilibrium are established In container (1) A(s)hArrD(g) + C(g) P_(T) = 40 atm at equilibrium In container (2) B (s)hArrE(g) + F(g) P_(T) = 60 atm at equilibrium If excess of A and B are added to a third container having double the volume and at same temperature then the total pressure of this container at equilibrium is ?

Answer»

50 atm
100 atm
200 atm
70 atm

Answer :B
Discussion
14816.

Which of the following polymer is used in pigment ?

Answer»

Buna-S
Neoprene
TEFLON
ORLON

SOLUTION :Orlon
Discussion
14817.

Writing Lewis Struchures for Molceules with more than One central atom. Write the Lewis structure for methanol (molecularfarmula CH _(4) O), on important industrical alcohol tht is being used as a gasoline alternative in car engines.

Answer»

Solution :Step:1 Place the atoms relative to each other. The H atoms can have only one bond, so C and O must be adjacent to each other. In nearly all their compounds, C has four BONDS and O has TWO, so we arrange the H atoms to shown this.
Step : 2 Find sum of valence electrons
`[1xx C (4e ^(-)) ] + [1xxO (6e ^(-)) ] + [ 4 xx H (1e ^(-)) ] = 14 e ^(-) {:(""H),(H " "C ""O ""H),(""H):}`
Step :3 Add single bonds and subtract `2e^(-)` for each bond. `H- underset(H) underset(|) OVERSET(H) overset(|) (C) -O-H`
Five bonds ue `10 e^(-), so 14 e ^(-)- 10 e ^(-)` leaves `4e ^(-)` remaining.
Step :4 Add remaining electrons in pairs.

Carbond already has an octet, so the four remaining VELENCE `e ^(-)` from two lone pairs on O and give the Lewis strructure for methanol.
Discussion
14818.

Which one of the following reactions does not occur ?

Answer»

`BaO+O_(3)rarrBaO_(2)+O_(2)`
`PbS+4O_(3)rarrPbSO_(4)+4O_(2)`
`H_(2)O_(2)+O_(3)rarrH_(2)O+2O_(2)`
`2Hg+O_(2)rarrHg_(2)O+O_(2)`

Answer :A
Discussion
14819.

Tri Halogen methane on hydrolysis with KOH (aq) gives :

Answer»

Formic ACID
ACETIC acid
Pot. Formate
All

Answer :C
Discussion
14820.

Which of the following pair of complexes are co-ordination isomers ?

Answer»

`[Co(NH_(3))_(5)Br]SO_(4)" and "[Co(NH_(3))_(5)SO_(4)]Br`
`[PT(NH_(3))_(4)]" "[PtCl_(4)]" and "[Pt(NH_(3))_(2)Cl_(2)][Pt(NH_(3))_(2)Cl_(2)]`
`[Co(H_(2)O)_(6)]Cl_(3)" and "[Co(H_(2)O)_(5)Cl]C1.2H_(2)O`
None of these

Answer :D
Discussion
14821.

Write the difference between reducing sugar and non-reducing sugar.

Answer»


ANSWER :Carbohydrates which REDUCE Tollen.s reagent or Fehling.s SOLUTION are CALLED as reducing sugar and which do not-reduce these two reagents are called as non-reducing sugars.
Discussion
14822.

Which of the following is neither a nucleophile nor an electrophile ?

Answer»

`H_(2)O`
`NO_(2)^(+)`
`SO_(3)`
(C2H5)_4N+'

Answer :D
Discussion
14823.

Whichone of the followingis not a method of concentration of ore

Answer»

GRAVITY separation
froth FLOTATION process
electromagnetic separation
smelting

ANSWER :D
Discussion
14824.

Write the name and structures of monomer(s) in the following polymers : (i) Nylon 6(ii) PVC(iii) Neoprene

Answer»

Solution :(i) Nylon 6

(ii) PVC
`UNDERSET("Vinyl CHLORIDE")( CH_(2) -OVERSET(overset(CI)|)CH)`
(III) Neoprene
`underset("2-chloro-1, 3-butacliene")(nCH_(2) = overset(overset(CI)|)C-CH=CH_(2))`
Discussion
14825.

The substances which behave as colloidal solutions at higher concentration are called

Answer»

associated colloids
multimolecular colloids
macromolecular colloids
protective colloids.

Solution :SUBSTANCES WHOSE molecules aggregate SPONTANEOUSLY in a given SOLVENT to FORM particles of colloidal dimensions are called associated colloids or micelles.
Discussion
14826.

Which one of thefollowingis named as peptides ?

Answer»

Esters
Salts
Amides
Ketones

ANSWER :C
Discussion
14827.

The vitamin that function as visual pigment is ………………….

Answer»

RETINOL
PYRIDOXINE
RIBOFLAVIN
ASCORBIC acid

Solution :Retinol
Discussion
14828.

Which of the hydracids of halogens reacts with glass ?

Answer»

Solution :HF , FLUORIDE ION has a strong affinity for Si and hence HF attacks SILICATES and silica PRESENT in GLASS `(Na_(2)SiO_(3) + 6 HF rarr Na_(2)SiF_(6) + 3 H_(2)O and SiO_(2) + 4HF rarr SiF_(4) + 2H_(2)O)`
Discussion
14829.

Which of the following specieswould not be involved in the Hoffmann rearrangement shown below ?

Answer»




ALLOF the above are INVOLVED in the REACTION.

SOLUTION :
Discussion
14830.

Which of the following is a constitutent of soap ?

Answer»

SODIUM sterate
Sodium salicylate
Sodium butyrate
Sodium benzenesulphonate

Answer :A
Discussion
14831.

What is the contribution of a corner particle to a unit cell in a cubic crystal lattice ?

Answer»

SOLUTION :`(1)/(8)`TH or one-eighth.
Discussion
14832.

The specific rotation for the C-anomer of a carbohydrate is +29^(@) and that of beta-anomer is -17^(@) Due to mutarotation, the equilibrium specific rotation is +14^(@). The percentage of cl-anomer is

Answer»

`45.6%`
`55.2%`
`60.2%`
`67.4%`

Solution :`alpha - "anomer" HARR beta -"anomer"`
equilibrium `"" (X-1)""x`
given`(1-x)(29^(@)) - x(17^(@)) = 14^(@)`
Discussion
14833.

Vitamin which is believed to cure common cold is :

Answer»

A
C
K
E

Answer :B
Discussion
14834.

Which one of the following statements is correct ? In a reversible reaction, catalyst

Answer»

increases the rate of the forward REACTION
DECREASES the rate of the reverse reaction
increases the rate of the forward and reverse reactions equally
alters the EQUILLIBRIUM constant of the reaction.

ANSWER :C
Discussion
14835.

Whichof the followingis morereactivetowardsHBr ?

Answer»

ETHYLENE
Propylene
ISO - BUTYLENE
n-Butene

ANSWER :C
Discussion
14836.

Which of the following has the minimum heat of dissociation

Answer»

`(CH_(3))_(3)N: to BF_(3)`
`(CH_(3))_(3)N: to B(CH_(3))_(2)F`
`(CH_(3))_(3)N: to B(CH_(3))_(3)`
`(CH_(3))_(3)N: to B(CH_(3))F_(2)`

Solution :Due to +I effect of methyl GROUPS the Lewis character of `B(CH_(3))_(3)` DECREASE and COORDINATION becomes weaker.
Discussion
14837.

Which aerosols deplete ozone ?

Answer»

Solution :AEROSOLS such as chlorofluorocarbons (CFC's), i.e., freon `(CCl_(2)F_(2))` depletes the `O_(3)` LAYER by SUPPLYING Cl free radicals which convert `O_(3)` to `O_(2)` as shown below :
`{:(Cl_(2)CF_(2)(g) overset(hv)rarr. Cl(g) + ."CCLF"_(2)(g)","Cl(g) + O_(3)(g) rarr ClO. (g)+O_(2)(g)),(""ClO.(g) rarr .Cl(g) + . O(g)","ClO.(g) + .O(g) rarr .Cl(g) + O_(2) (g)):}`
Discussion
14838.

What are t_(2g) and e_(g) orbitals?

Answer»

SOLUTION :In a FREE transition metal ION, the d-orbitals are DEGENERATE. When it form complex, the DEGENERACY is split and d-orbitals split into `t_(2g)` and `e_(g)` orbitals.
Discussion
14839.

Which of the process do not involve abosrption of energy ?

Answer»

`S (G) + E to S ^(-)(g)`
`O ^(-) + e ^(-) to O ^(2-) (g)`
`Cl (g) + e ^(-) to Cl ^(-) (g)`
`O (g) + e ^(-) to O ^(-) (g)`

ANSWER :A::C::D
Discussion
14840.

Which gas evolve when ammonia solution is added to potassium parmanganate?

Answer»

`N_(2)`
`NO`
`NO_(2)`
`N_(2)O_(5)`

SOLUTION :Aqueous solution of ammonia REDUCES potassium permangante giving manganese DIOXIDE and itself is oxidised to nitrogen.
`2KMnO_4 + 2NH_3 to 2MnO_2 + 2KOH + 2H_2O + N_2`
Discussion
14841.

Which of the following pairs of compounds is expected to exhibit same colour in aqueoussolution ?

Answer»

`FeCI_(2),CuCI_(2)`
`VOCI_(2),CuCI_(2)`
`VOCI_(2),FeCI_(2)`
`FeCI_(2),MnCI_(2)`

Answer :B
Discussion
14842.

Which of the following electronic comfigurations has the lowest ionosation energy ?

Answer»

`1s^2 2s^2 2p^3`
`1s^2 2s^2 2p^5`
`1s^2 2s^2 2p^6`
`1s^2 2s^2 2p^6 3s^1`

ANSWER :D
Discussion
14843.

Which of the following is a simple protein?

Answer»

Albumin
Globulin
Glutenin
All

Answer :B
Discussion
14844.

Which of the following compound will easliy undergo dehydration ?

Answer»

2-METHYL PROPANE - 2- OL
Ethyl alcohol
3- methyl - 2- BUTANOL
2-pentenol

Solution :2-methyl propane - 2- ol
Discussion
14845.

Which of the following after reacting with KI do not remove iodine

Answer»

`CuSO_(4)`
`K_(2)Cr_(2)O_(7)`
`HNO_(3)`
`HCl`

ANSWER :D
Discussion
14846.

Which of the following does/do not react with Fehling's solution?

Answer»

Benzaldehyde
Acetaldehyde
Glucose
ACETOPHENONE

ANSWER :A::D
Discussion
14847.

What is snake venom made of ?

Answer»

SOLUTION :SNAKE VENOM is a PROTEIN.
Discussion
14848.

The standard enthalpy of formation of NH_(3) is -46.0kJmol^(-1). If enthalpy of formation of H_(2) from its atoms is 436 kJ mol^(-1) and that of N_(2) is -712kJmol^(-1), the average bond enthalpy of N-H bond in NH_(3) is

Answer»

`-964kJmol^(-1)`
`+352kJmol^(-1)`
`+1056kJmol^(-1)`
`-1102kJmol^(-1)`

ANSWER :B
Discussion
14849.

Which of the following statements is INCORRECT in case of Hofmann bromamide degradationn?

Answer»

Reaction is useful for decreasing LENGTH of CARBON chain by one carbon atom <BR>It gives tertiary amine
It gives primary amine
Aqueous or alcoholic KOH is used with bromine.

Solution :Hoffmann hypobromite degradation
`R-CONH_(2) + Br_(2) + 4NaOH to R-NH_(2) + Na_(2)CO_(3) + 2NaBr + 2 H_(2)O`
Incorrect statement B
Discussion
14850.

Vapour pressure of an aqueous solution is 2% less than that of the solvent. The molality of the solution is

Answer»

2m
1.5m
1.13m
0.2m

Answer :C
Discussion