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6401.

When H_(2)S is passed through Hg_(2)S we get

Answer»

HGS
`HgS+Hg_(2)S`
`Hg_(2)S+HG`
`Hg_(2)S`

ANSWER :C
Discussion
6402.

Write the balanced equation for complete hydrolysis of XeF_6.

Answer»

SOLUTION :`XeF_6 + 3H_2O RARR XeO_3 + 6HF`
Discussion
6403.

Which of the following can be prepared by Gabriel method from their corresponding halides or tosylates? Allylamine,tert-Butylamine, Diethylamie, Neopentylamine, o-Nitroaniline, m-Nitroaniline p-Nitroanlamine, Vinylamine, p-toludiene, n-Butylamine

Answer»


ANSWER :4
Discussion
6404.

The surface tension of which of the following liquid is maximum?

Answer»

`H_2O`
`C_6H_6`
`CH_3OH`
`C_2H_5OH`

ANSWER :A
Discussion
6405.

The vapour pressure of water is 92 mm at 323 K. 18.1 g of urea are dissolved in 100 g of water. The vapour pressure is reduced by 5 mm. Calculate the molar mass of urea.

Answer»

<P>

Solution :`"The solution is not DILUTE. APPLY "(p^(@)-p_(s))/(p^(@))=(n_(2))/(n_(1)+n_(2))`
Discussion
6406.

What is the oxidation state of Cl inClO_3?

Answer»

`+VI`
`III`
`+IV`
`II`

ANSWER :A
Discussion
6407.

Toluene on side chain chlorination and followed by hydrolysis gives

Answer»

Tolyl CHLORIDE
benzaldehyde
p- CHLORO TOLUENE
acetophenone

Answer :B
Discussion
6408.

Which concentration term is temperature independent ?

Answer»

MOLARITY
`% w//v`
`% v//v`
OLEUM labelling

Answer :D
Discussion
6409.

Which of the following structural unit found in enzymes or hormones

Answer»




`-OVERSET(O)overset(||)C-UNDERSET(H)underset(|)N-`

ANSWER :D
Discussion
6410.

Which of the following is the most reactive isomer ?

Answer»

`CH_(3)CH_(2)CH_(2)CH_(2)-OVERSET(O) overset("||")C-H`
`CH_(3)CH_(2)CH_(2)-overset(O)overset("||")C-CH_(3)`
`CH_(3)CH_(2)-overset(O)overset("||")C-CH_(2)CH_(3)`
`CH_(3)-overset(O)overset("||")C-UNDERSET(CH_(3))underset(|)(CH)-CH_(3)`

Answer :A
Discussion
6411.

Universal recipient is blood transfusion belongs to the group:

Answer»

Adrenaline
B
AB
O

Answer :C
Discussion
6412.

Which one of the following acid cannot be prepared from grignard reagent by the action of dry ice?

Answer»

`CH_3COOH`
`C_6H_5COOH`
`CH_3-CH_2COOH`
`HCOOH`

SOLUTION :`HCOOH`
Discussion
6413.

whichof the following reactions will not give a primary amine ?

Answer»

`CH_3 CONH_2 OVERSET(Br_2 // KOH)to`
`CH_3 CNoverset(LiAIH_4 )to`
`CH_3 NCoverset(LiAIH_4) to `
`CH_3 CONH_2 overset(LiAIH_4)to`

SOLUTION :`CH_3 NCoverset(LiAIH_4) to `
Discussion
6414.

Write the reactions of carboxylic acid with the following reagents. (Write the chemical equations) (iii) Lithium Aluminium hydride (LiAlH_4) ether.

Answer»


ANSWER :`R-COOH OVERSET(LiAlH_4)rarrR-CH_2OH`
Discussion
6415.

Which gas turns limewater milky?

Answer»

CARBON dioxide
Nitrogen dioxide
Hydrogen sulphide
Carbon monoxide

Answer :A
Discussion
6416.

Which of the following graphs shows most significant deviation from ideal gas behavior

Answer»




ANSWER :D
Discussion
6417.

Which of the following compounds does not contain an -OH group

Answer»

Phenol
Carboxylic acid
Aldehydes
Alcohols

Answer :C
Discussion
6418.

Which of the following is/are correct name for the give polymer?

Answer»

Polypropene
Polystyrene
.Urea-formaldehyde Resin
Bakelite

Solution :
(A) incorret
In ABBREVIATED FORM of dipeptides, amino acid havig free amino GROUP is written first so
Abb. From: `ALA-GLY` not `GLY-ALA`
(B). CORRECT
(C) correct
`Ph-COOH+NaHCO_(3)hArrPh-COONa+H_(2)CO_(3)toH_(2)O+CO_(2)toPh-OH+NaHCO_(3)to` no REACTION.
Discussion
6419.

To the CuSO_(4) solution, NaHSO_(3) and HCl were added followed by ammonium thiocanate solution. The compound formed is

Answer»

`Cu(SCN)_(2)`
`CUSCN`
`Cu(SO_(3))_(2)`
`CuSO_(4)`

Solution :`Cu^(2+)` is reduced to `Cu^(+1)` by `SO_(2)`. CuSCN GET PRECIPITATED.
Discussion
6420.

Write the IUAPC names of the following compounds.:

Answer»

SOLUTION :(i). 3-chloro-5-fluoro-3,5-dimethylheptane
(ii). 3-Bromo-5-chloro-3,5-dimethylheptane (iii) 1-chloro-3,3-dimethylbutane.
(iv). 5-Chloro-3-ethylpentan-2-one (v) 4-chloropentan-1-ol
(vi). 2,3-Dibromo-1-chloro-2-methylpentane (VII) 3-bromo-2-chloro-5-methyloctane
(viii). 3-Bromohexa-1,3,5-triene (IX) 2,3-Dibromo-1,4-dichlorobut-2-ene.
(x). 2-bromo-3-chlorobutane.
Discussion
6421.

Which of the following statement (s) is /are correct ? (1) Cuprite and Zincite are oxide ores (2) Magnesite and carnallite are carbonate ores (3) Chalcocite and azurite are ores of copper (4) Felspar and mica mineral contain aluminium

Answer»

1, 2
1, 3
1, 4
`1, 3, 4`

Answer :D
Discussion
6422.

Which of the following is less than sero during adsorption?

Answer»

`DELTA G`
`Delta S`
`Delta H`
All of these.

ANSWER :D
Discussion
6423.

Which of the following willincrease the voltage of the cell represented by the equation Cu(s)+2Ag^(+)(aq)hArrCu^(2+)(aq)+2Ag(s)

Answer»

increase in the DIMENSION of Cu electrode
increase in the dimension of Ag electrode
increase in the CONCENTRATION of `Cu^(2+)` ion
incrase in the concentration of `Ag^(+)` IONS

Solution :`E_("CELL")=E_("cell")^(@)-(RT)/( NF)"In"(|Cu^(2+)|)/(|Ag^(+)|^(2))`
thus increase in the concentration of `Ag^(+)` ions will increase `E_("cell")`.
Discussion
6424.

Which acts as reducing agent as well as oxidising agent ?

Answer»

`O_3`
`CIO_4^-`
`F_2`
`MnO_4^-`

ANSWER :A
Discussion
6425.

What are artificial sweeteners? Give an example.

Answer»

SOLUTION :These are low CALORIE substances used as SWEETENING AGENTS to replace sugar,
e.g. saccharin, ASPARTAME.
Discussion
6426.

Which of the following is most reactive towards addition reaction of hydrogen cyanide to form corresponding cyanohydrin?

Answer»

Acetone
FORMALDEHYDE
ACETALDEHYDE
Diethylketone

Solution :Formaldehye NAR (ELECTROPHILICITY of CARBOCATION, decreases reactivity decreses)
Discussion
6427.

Write short note on Hoffmann's bromamide reaction

Answer»

`HCHO`
`CH_3CHO`
`CH_3OH`

ANSWER :D
Discussion
6428.

The source of nitrogen in Gabriel synthesis of amines is:

Answer»

Sodium AZIDE, `NaN_(3)`
Sodium nitrite, `NaNO_(2)`
POTASSIUM cyanide, `KCN`
Potassium phthalimide, `C_(6)H_(4)(CO)_(2)N^(-)K^(+)`

Solution :Allyl isocyanide is
`overset(H)overset(|)underset(H)underset(|)C=overset(H)overset(|)C-overset(H)overset(|)C-overset(H)overset(|)underset(H)underset(|)C-N-=C""9sigma and 3PI"bonds"`
Discussion
6429.

The substance added to NaCl in Down's process to lower the melting point of NaCl is

Answer»

NaCl
`K_(2)CO_(3)`
`CaCl_(3)`
`AlCl_(3)`

Solution :The substance ADDED to NaCl in Down.s process to LOWER the MELTING point of NaCl is `CaCl_(2)`
Discussion
6430.

The van't Hoff factor (i) for a dilute aquoues solution of the strong electrolyte barium hydroxide is

Answer»

0
1
2
3

Answer :D
Discussion
6431.

Which of the following conversions can be carried out by both acidified K_(2)Cr_(2)O_(4) and acidified KMnO_(4)? (i) Fe^(2) to Fe^(3+)+e^(-) (ii) I^(-) to IO_(3)^(-) (iii) I^(-) to I_(2) (iv) H_(2)S to S

Answer»

(i) and (iii)
(II) and (IV)
(i),(iii) and (iv)
(i), (ii) and (iii)

Solution :`I^(-)` is converted to `IO_(3)^(-)`by neutral or faintly alkaline `MnO_(4)^(-)` as shown below.
`2MnO_(4)^(-)+H_(2)O+I^(-) to 2MnO_(2)+2OH^(-)+IO_(3)^(-)`
Discussion
6432.

Which of the following statements are correct for trimethylamine ?

Answer»

It has a TRIGONAL pyramidal shape
The C-N-C BOND angle is `108.7^(@)`
The N atom is `sp^(3)` hydridized
The unshared pair of ELECTRONS on nitrogen occupied an `sp^(2)` orbital

Answer :A::B::C
Discussion
6433.

Which one of the following is not an amphoteric substance?

Answer»

`HNO_(3)`
`HCO_(3)^(-)`
`H_(2)O`
`NH_(3)`

Solution : `HNO_(3)` is a very strong acid. It exhibits usual properties of acids. It REACTS with basic oxides, carbonates, bicarbonates and hydroxides forming corresponding salts.
`CaO+2HNO_(3)toCa(NO_(3))_(2)+H_(2)O`
`Na_(2)CO_(3)+2HNO_(3)to2NaNO_(3)+H_(2)O+CO_(2)`
Discussion
6434.

Which compound has coloured aqueous solution

Answer»

`Zn(NO_(3))_(2)`
`LiNO_(3)`
`Co(NO_(3))_(2)`
`BA(NO_(3))_(2)`

Answer :C
Discussion
6435.

whichoneof thefollowingstatementsis notcorrect ?

Answer»

Catalystdoesnot initiate anyreaction
THEVALUEOF equilibriumconstantis changedinthepresenceof acatalystin thereactionequilibrium
Enzymescatalyse MAINLY biochemicalreaction
Coenzymesincrease thecatalyticactivity ofenzyme

Solution :FORA reversiblereaction , itaccelerates thespeedof forwardas WELLAS backwardreactionto theequilibriumi.e.,doesnot chargetheequilibrium constant of thereactionbut helps toattaintheequilibriumfaster .
Discussion
6436.

Which one of the following is used in blast furnace for drying air?

Answer»

ACTIVATED CHARCOAL
SILICA GEL
Alumina
Permutit

Solution :Silica gel
Discussion
6437.

Which of the following has the maximum ionic character ?

Answer»

HF
HBR
HCl
HI

Solution :HF has MAXIMUM ionic CHARACTER, because F has maximum electronegativity.
Discussion
6438.

When manganese dioxide is fused with KOH in air, it gives

Answer»

POTASSIUM permanganate
Potassium manganate
Manganese HYDROXIDE
`Mn_3O_4`

ANSWER :B
Discussion
6439.

The stability of 2,3-dimethyl but-2-ene is more than 2-butene. This can be explained in terms of:

Answer»

Resonance
Hyper conjugation
Electromeric effect
Inductive effect

Answer :B
Discussion
6440.

What is Ellingham diagharm ? What information can be known from this in the reduction of oxides?

Answer»

Solution :The graphical representation of Gibbs energy which provides a sound basis for considering the choice of REDUCING agent in the reduction of oxides. This graphical representation Is known as Elligham diagram.
`rarr`This diagram helps us in predicting the feasibility of thermal reduction of an ore.
`rarr`The Criterion of feasibility of a REACTION is that at a given temperature ,Gibbs energy of the reacation must be negative.
`rarr`Ellingham diagram normally consists plots of`DeltaG^(@)`vs T for formation of oxides ofelements .
`rarr` The graph indicates whether a reaction is POSSIBLE or not , i.e. , the tendency of reducationwith a reducing agents is indicated with a reducing agent is indicated.
`rarr` The reducing agent forms its oxide when the metal oxide is reduced. The roel of reducing agent is to MAKE the sum of `DeltaG^(@)`values of the two reactions negative.
`rarr`out of C and CO , carbon monoxide (CO) is a better reducting agent at 673K.
`rarr` At 983K (or) above coke (C) is better reducing agent.,
`rarr`The above observations are form Ellingham diagam . ,
Zinc is not extracted from zinc oxide through reduction by using CO.
Explanation :
`2Zn+O_(2)rarr 2ZnO,DeltaG^(@)=-650KJ`
`2CO+O_(2)rarr2CO_(2)'DeltaG^(@)=-450KJ`
`2ZnO+2COrarr2Zn,2CO_(2')DeltaG^(@)=200KJ`
`DeltaG^(@)`= positive indicatis that reaction is not FEASIBLE.
The above fact is explained on the basis of Ellingham diagram.
Discussion
6441.

Which form of sulphur shows paramagnetic behaviour ? Or Sulphur in the valpour state exhibits paramagnetism.

Answer»

Solution :In the vapour state (~ 1000 K), SULPHUR partly exists as `S_(2)` molecules which have two unpaired ELECTRONS in the antibonding `PI^(*)`-molecular orbitals LIKE `O_(2)` and HENCE, `S_(2)` exhibits paramagnetism.
Discussion
6442.

Which is more basic La(OH)_(3) or Lu(OH)_(3) ? Why ?

Answer»

SOLUTION :`LA(OH)_(3)` is more basic because of LARGER size of La than LU.
Discussion
6443.

Which of halogen acids indicated below is incorrect ?

Answer»

HF >HCI >HBR > HI ( acidic strength )
HI > HBr > HCI >HF ( reducingstrength )
HI >HBr>HCI >HF (bondlength)
HF >HCI >HBr >HI(THERMAL STABILITY )

Answer :A
Discussion
6444.

The substances which are strongly attracted by the magnetic field and slow permanent magnetism even when magneti field is removed are called ___________ substances.

Answer»

SOLUTION :ferromagentic
Discussion
6445.

The sugar that is disaccharide among the following is

Answer»

glucose
maltose
xylose
stachyose

Answer :B
Discussion
6446.

What is binary solution?

Answer»

SOLUTION :A solution which consists of TWO components is CALLED BINARY solution.
Discussion
6447.

Why are compounds of transition elements generally coloured ?

Answer»

SOLUTION :DUE to d-d TRANSITIONS of ELECTRONS in d- ORBITALS.
Discussion
6448.

Which of the following is 100 times sweeter than sugar?

Answer»

Sucrolose
Saccharin
ASPARTAME
ALITAME

ANSWER :C
Discussion
6449.

Which of the following statements is true for fuel cells

Answer»

They are more efficient
They are free from POLLUTION
They RUN TILL REACTANTS are active
all of these

Solution :Fuel CELLS are more efficent, free from pollution and they run till reactants are active.
Discussion
6450.

Which of the following electrolytes is least effective incoagulating firrec hydroxide solution?

Answer»

KBr
`K_(2)SO_(4)`
`K_(2)CrO_(4)`
`K_(4)[Fe(CN)_(6)]`

Solution :Smaller the charge on ANION, lesser will be its COAGULATING power.
`therefore` KBr have `Br^(-)` with least charge of -1 on br THUS KBr is least effective in coagulating `Fe(OH)_(3)`.
Discussion