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19551.

Write IUPAC name of the following : .

Answer»

SOLUTION :5 BROMO 3-chloro-2-iodobenzoic ACID.
Discussion
19552.

Which plot is the adsorption isobar for chemisorption where X is the amount of gas adsorbed on mass m (at constant pressure ) at temperature T:

Answer»




ANSWER :C
Discussion
19553.

Which one of the following elements is least reactive with water

Answer»

Lithium
Sodium
Potassium
Cesium

Solution :Iron corrodes rapidly , because of its non-stable corrosion products on the surface . Rust occurs when metals containing iron reacts with the OXYGEN in the air or in water and form a compound called iron (III) OXIDE (ferric oxide) . This compound contains water molecules,so we call it a hydrated compound . Both oxygen gas and water must be PRESENT for the iron to rust .
CHEMICALLY and very simply speaking , iron atoms lose a few ELECTRONS to oxygen atoms . this processby which electrons are removed from atoms is called oxidation.
When oxidationoccurs , it produces a chemical reaction that creates iron (III) oxide-or rust .
Discussion
19554.

Which monomer is present in CH_(3)-overset(CH_(3))overset("|")underset(CH_(3))underset("|")"C "-CH_(2)-overset(CH_(3))overset("|")underset(CH_(3))underset("|")"C "polymer ?

Answer»


`CH_(3)CH=CH-CH_(3)`
`CH_(3)-CH=CH_(2)`
`(CH_(3))_(2)C=C-(CH_(3))_(2)`

ANSWER :A
Discussion
19555.

To a nitrate salt solution of a metal, addition of dilute solution of HCl in cold condition results in formation of white coloured precipitate and no visible change is above formed precipitate. On the other hand. The above formed white precipitate dissolves in a saturated solution of KCl, giving a clear solution, formed above, initially a red precipitate (X) is formed, whch finally turned into black precipitate on passing H_(2)S(g) for long time. This black precipitate on treatment with boiling, concentrated X is most likely to be

Answer»

`Ag_(3)SCL`
`Pb_(2)SCl_(2)`
`PbS_(2)`
`Hg_(2)SCl_(2)`

Answer :B
Discussion
19556.

What is the final product of the reaction? (CH_(3))HC= C (CH_(3))CH_(2)CH_(3) underset((ii) H_(2)O_(2)//OH)overset((i)BH_(3)//THF)rarr underset(CH_(2)Cl_(2))overset(PC C)rarr underset((ii)H_(3)O^(+))overset((i)CH_(3)MgBr)rarr

Answer»

2,3-dimethyl-3-pentanol
2,4-dimethyl-3-pentanol
2,3-dimethyl-2-pentanol
2,2-dimethyl-3-pentanol

Solution :
Discussion
19557.

Which one of the following isomeric amines has the highest boiling point

Answer»

`CH_(3)-CH_(2)-CH_(2)NH-CH_(3)`
`CH_(3)-CH_(2)NH-CH_(2)-CH_(3)`
`(CH_(3))_(2)N-CH_(2)CH_(3)`
`CH_(3)CH_(2)CH_(2)-NH_(2)`

SOLUTION :1-Aminobutane is a `1^(@)`-amine the highest boiling POINT DUE to more ASSOCIATION by H-bonding.
Discussion
19558.

Which of the following is not linear polymer

Answer»

BAKELITE
POLYESTER
CELLULOSE
HIGH DENSITY polyethene

Answer :A
Discussion
19559.

Which is produced when diethyl ether is exposed to air annd light?

Answer»

`CH_(3)CH_(2)O-UNDERSET(OH)underset(|)(C)H-CH_(3)`
`CH_(3)CH_(2)-O-COCH_(3)`
`CH_(3)CH_(2)-O-CH_(2)CH_(2)OH`
`CH_(3)CH_(2)-O-CH_(3)OOCH_(3)`

Solution :Hydroperoxide formation occurs at the more reactive `alpha`-carbon.
Discussion
19560.

Which one of the following reactions is called Rosenmund's reaction ?

Answer»

ALDEHYDES are REDUCED to alcohols
Acids are CONVERTED to ACID CHLORIDES
Alcohols are reduced to hydrocarbons
Acid chlorides are reduced to aldehydes

Answer :D
Discussion
19561.

Titanium , which is used to make air plane engines and frames, can be obtained from titanium tetrachloride , which in turn is obtained from titanium oxide by the following process : 3 TiO_(2)(s) + 4C(s) + 6Cl_(2)(g) to 3TiCl_(4)(g) + 2CO_(2)(g) + 2CO (g) A vessel contains 4.3 g TiO_(2),5.76 g C and ,7.1 g Cl_(2) ,suppose the reaction goes to completion as written , how many gram of TiCl_(4) can be produced ? (Ti =48)

Answer»


ANSWER :`9.5`
Discussion
19562.

Which of the following is used as antiseptic.

Answer»

DETTOL
IODOFORM
BITHIONAL
All of the above

ANSWER :D
Discussion
19563.

Which of the following is not a synthetic polymer:

Answer»

polyisoprene
polybutadiene
Polyethylene terephthalate
Polyethylene

Answer :A
Discussion
19564.

Which one of the following is a semisynthetic polymer?

Answer»

POLY isoprene
VISCOSE RAYON
nylon
terylene

Solution :viscose rayon
Discussion
19565.

x Br_(2) + y KOH rarr KBr + KBrO_(3) + H_(2)O here the equivalent mass of Br_(2) of the reaction is how many times the equivalent mass of Br_(2) as reductant.

Answer»


Solution :Eq. WT. of `Br_(2)` in GIVEN reaction `= ( 3MW)/(5)`, Eq. wt. of `Br_(2)` as REDUCTANT `= ( MW)/( 10)`
`:. (3)/(5) ` ( M.W. ) = x TIMES `( M.W. ) /(10) :. X = 6`
Discussion
19566.

Which of the following compounds when treated with dibenzyl cadmium yeilds benzyl methyl ketone?

Answer»

Acetone
ACETALDEHYDE
ACETIC acid
ACETYL chloride

SOLUTION :Acetyl chloride+ dibenzyl cadmium `to` benzyl methyl KETONE.
Discussion
19567.

The weight of calcium hydroxide, Ca(OH)_(2) in 100 ml of 0.01 M solution will be (At. Mass of Ca=40)

Answer»

1.48 g
74.0 g
14.8 g
0.074 g

Solution :Molar mass of `CA(OH)_(2)=74`
`0.01M=((W)/(74)xx1000)/(100)`
or `W=(0.74)/(10)=0.074g`.
Discussion
19568.

Which of the following is/are negatively charged sol?

Answer»

GOLD SOL
PRUSSIAN BLUE DYE
Haemolobin
Starch

Solution :N//A
Discussion
19569.

Which of the following is an example of vicdihalide ?

Answer»

Dichloromethane
1,2 - dichloroethane
Ethylidene chloride
Allyl chloride

SOLUTION :Vicinal DIHALIDES have halogen bonded on ADJACENT carbons.
Discussion
19570.

Which statement is correct :

Answer»

`Fe^(3+)` ions give deep green precipitate with `K_(4)Fe(CN)_(6)` solution
On heating `K^(+), Ca^(2+)` and `HCO_(3)^(-)` ions we get a precipitate of `K_(2)Ca(CO_(3))_(2)`
Manganese salts give a violet borax BEAD test in the reducing flame
From a mixed precipitate of AgCl and AGL ammonia solution dissolves only AgCI

Answer :D
Discussion
19571.

Which of the following acids is strongest ?

Answer»

`HBrO_4`
HOCL
`HNO_3`
`H_3AsO_3`

ANSWER :A
Discussion
19572.

The relative nucleophilicity of NH_3, H_2O and HF towards bromoethane is

Answer»

`H_3N GT H_2O gt HF`
`HF gt H_2O gt NH_3`
`NH_3 gt HF gt H_2O`
`H_2O gt NH_3 gt HF`

SOLUTION :ΕΝ `ALPHA` NUCLEOPHILICITY
Discussion
19573.

Which of the following are used as analgesics ?

Answer»

Aspirin
Heroin
Promethazine
Serotonin

Answer :A::B
Discussion
19574.

Which solution will show maximum elevation in b.pts:

Answer»

0.1 M KCl
0.1 M `BaCl_2`
0.1 M `FeCl_3`
0.1 M `Fe_2(SO_4)_3`

ANSWER :D
Discussion
19575.

Which of the following is not an example of Sandmeryer's reaction?

Answer»

`C_(6) H_(5) overset(+)(N_(2)) Cl^(-) overset(CuCl)(rarr) C_(6)H_(5)Cl`<BR>`C_(6) H_(5) overset(+)(N_(2)) Cl^(-) overset(CuBr)(rarr) C_(6)H_(5)Br`
`C_(6) H_(5) overset(+)(N_(2)) Cl^(-) overset(CuCN)(rarr) C_(6)H_(5)CN`
`C_(6) H_(5) overset(+)(N_(2)) Cl^(-) UNDERSET(KL)overset(KCN)(rarr) C_(6)H_(5)I`

SOLUTION :NA
Discussion
19576.

The two isomeric compounds with formula C_(5)H_(10) are A and B. A decolourises Br_(2) in C Cl_(4) but B does not. Pick up the correct statement about A and B

Answer»

A can be cyclopentane
B can be cyclopentane
A and B are both olefins
A cannot be 2-pentene

Solution :A is ALKENE but B is cycloalkane with 5C atoms. The CHIRAL carbons are marked as *
Discussion
19577.

Which of the following gas is filled in the tyres of aeroplanes ?

Answer»

`H_(2)`
He
`N_(2)`
Ar

Solution :`N_(2)` being incombustible and ABUNDANTLY AVAILABLE in AIR is used for filling tyres of AEROPLANES.
Discussion
19578.

Which of the following is not a smelting process ?

Answer»

addition of flux
levigation
addition of slag
Liquation

Solution :In SMELTING ELEMENTS COME out in free state
Discussion
19579.

Which of the following complex will produce maximum amount of AgCl" "(ppt.) on reaction with excess of AgNO_(3) ?

Answer»

`PtCl_(2).4NH_(3)`
`PtCl_(2).2HCl`
`CoCl_(3).4NH_(3)`
`PtCl_(2).2NH_(3)`

Solution :`(a) [Pt (NH_(3)_(4)]Cl_(2)`
`(b) H_(2)[PtCl_(4)]`
`(c ) [Co(NH_(3))_(4)Cl_(2)]Cl`
(d) `[Pt(NH_(3))_(2)Cl_(2)]`
Discussion
19580.

What is a secondary battery ? Write the mechanism of lead storage battery with the help of chemical equation.

Answer»

SOLUTION :For ANSWER, CONSULT SECTION 22.
Discussion
19581.

The standard EMF of Daniel cell is 1.10 volt. The maximum electrical work obtained from the Daniel cell

Answer»

212.3 KJ
175.4KJ
106.15KJ
53.07 KJ

Answer :A
Discussion
19582.

Write the chemical equations in the following reactions : (i) Hoffmann-bromamide degradation reaction (ii) Carbylamine reaction

Answer»

Solution :(i) Hoffmann- bromamide DEGRADATION REACTION :
`R-OVERSET(overset(O)(||))(C)-NH_(2)+Br_(2)+4NaOH rarr R-NH_(2)+Na_(2)CO_(3)+2NaBR+2H_(2)O`
(ii) Carbylamine reaction :
`R-NH_(2)+CHCl_(3)+3KOH overset("Heat")(rarr)R-NC+3KCl+3H_(2)O`
Discussion
19583.

What is Nesseler's reagent ? What is the action of ammonia on Nesseler's reagent?

Answer»

Solution :Nesseler's reagent is an alkaline solution of `K_(2)HgI_(4)` obtained by MIXING the solutions of `HgI_(2)` and `KI` in excess.
`HgI_(2(aq))+underset("excess")(2KI_((aq)))rarr K_(2)HgI_(4(aq))`
Ammonia or AMMONIUM salts GIVE orange brown precipitate with Nesseler's reagent due to the FORMATION of Million's base.
Discussion
19584.

Which one of the following does not constitute the nucleic acid?

Answer»

URACIL
RIBOSE sugar
Phosphoric ACID
Guanidine

Solution :Guanidine does not constitute the NUCLEIC acid.
Discussion
19585.

Which of the following is an electrophile reagent ?

Answer»

`RO^-`
`BF_3`
`NH_3`
ROH

Answer :B
Discussion
19586.

Which of the followinghalogenexchange reactionwilloccurin acetone ?

Answer»

`R-I+NaCl`
`R-F+KCl`
`R-Cl+NaI`
`CH_(3)-F+AgBr`

ANSWER :C
Discussion
19587.

When hemiacetal reacts with alcohol the product is

Answer»

Dihemiacetal
ALCOHOL
ACETAL
PEPTIDE

ANSWER :C
Discussion
19588.

Which of the following on heating gives mixture of SO_2 and SO_3 ?

Answer»

`ZnSO_(3)`
`CuSO_(4)`
`FeSO_(4)`
`Na_(2)SO_(4)`

Solution :`2FeSO_(4)(s) overset(DELTA)to Fe_(2)O_(3)(s) + SO_(2)(g) + SO_(3)(g)`
Discussion
19589.

Which is knwis blister copper

Answer»

PURE COPPER
98% copper
Ore of coppe
Alloy of copper

SOLUTION :98% of copper is called as Blister copper.
Discussion
19590.

Which of the following electrolytes is least effective in causing flocculation of ferric hydroxide sol?

Answer»

`K_4[FE(CN)_6]`
`K_2CrO_4`
`KBR`
`K_2SO_4`

SOLUTION :`KBr`
Discussion
19591.

Under equilibrium conditions, which of the following is true

Answer»

`DELTAS=0`
`DeltaH gt 0`
`DeltaS gt 0`
`DeltaH LT 0`

ANSWER :A
Discussion
19592.

Which of the following will not undergo diazotisation?

Answer»

`C_6H_5-NH_2`
`C_6H_5-CH_2-CH_2-NH_2`

ANSWER :B
Discussion
19593.

Which one of the following does not show Tyndall effect and Brownian movement?

Answer»

Milk
COMMON SALT SOLUTION
smoke
tungstic ACID SOL

Solution :common salt solution
Discussion
19594.

The volume of water to be added to 100 cm of 0.5 N H_(2)SO_(4)to get decinormal concentration is

Answer»

100 `cm^(3)`
`450 cm^(3)`
`500 cm^(3)`
`400 cm^(3)`

Solution :`N_(1)V_(1) = N_(2)V_(2)`, i.e. `0.5 xx 100 = 0.1 xx V_(2)` or, `V_(2) = 500 cm^(3`.
`THEREFORE` Water to be added to `100 cm^(3)` solution.
`=500 - 100 = 400 cm^(3)`.
Discussion
19595.

Titanium can be obtained by :

Answer»

VAN Arkel METHOD
ELECTROREFINING
DISTILLATION
Liquation.

Answer :A
Discussion
19596.

What are homopolymers? Give examples ?

Answer»

Solution :Homopolymer is a high MOLECULAR mass macromolecule (POLYMER) which is formed from ONE TYPE of monomers . For examples , POLYTHENE is a homopolymer because it is formed from ethene monomer. Copolymer is a high molecular mass macromolecule (or polymer) which is formed from two or more different monomers. For examples. nylon-66 is a copolymer formed from hexamethylene diamine and adipic acid.
`underset("Hexamethylene diamine")(nH_2 N - (CH_2)_6 - NH_2) + nHOOC - underset("Adipic acid")((CH_2)_4) - COOH overset("Polymerisation")to underset("Nylon-66(copolymer)")([-NH-(CH_2)_6-NH-CO-(CH_2)_4-CO]_n)`
Discussion
19597.

Which of the following statement(s) is (are) correct with reference to the ferrous and ferric ions ?

Answer»

`Fe^(3+)` gives BROWN colour with potassium ferricyanide.
`Fe^(2+)` gives blue precipitate with potassium ferricyanide.
`Fe^(3+)` gives red colour with potassium THIOCYANATE.
`Fe^(2+)` gives brown colour with ammonium thocyanate.

Solution :The blue precipitate of `Fe^(2+)` ions with potassium ferricyanide is due to formation of TURNBULL's blue `Kfe^(II)[Fe^(III)(CN)_(6)]`
`Fe^(3+)+K_(3)[Fe(CN)_(6)]to underset("Potassium ferro ferricyanide")(K.Fe^(II)[Fe^(III)(CN)_(6)]+2K^(+))`
the red colouration of `Fe^(3+)` ions with potassium thiocyanate is due to the formation of `[Fe(CNS)_(3)]`
`Fe^(3+)+3KCNSto underset("Ferric thiocyanate red colour")([Fe(CNS)_(3)])+3K^(+)`
Discussion
19598.

The value of n in , MnO_4^- + 8 H^+ + n e ^- rarr Mn^2 + 4H_2O is :

Answer»

5
4
3
2

Answer :A
Discussion
19599.

Zn gives H_(2) gas with H_(2)SO_(4) andHCI but not with HNO_(3)because

Answer»

Zn acts as OXIDISING agent when reacts with `HNO_3`
`HNO_3` is WEAKER acid than `H_2SO_4 and HCl`
Zn is above the HYDROGEN in electrochemical series
`NO_3^(-)` is reduced in preference to `H^(+)` ion

ANSWER :D
Discussion
19600.

Which of the following values of heat of formation indicates that the product is the least stable?

Answer»

`-94` KCAL
`-231.6` kcal
`+21.4` kcal
`+64.8` kcal

Answer :B
Discussion