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10701.

What are the alternative terms for addition polymerization and condensation polymerisation?

Answer»

Solution :ADDITION polymerization is ALSO KNOWN as chain-growth polymerization and condensation polymerization is known as step-growth polymerization.
Discussion
10702.

Which of the following does not involve a catalyst ?

Answer»

Haber.s PROCESS
THERMITE process
Ostwald.s process
Contact process

Answer :B
Discussion
10703.

What is the role of graphite rod in the electrometallurgy of aluminium?

Answer»

Solution :In the electrometallurgy of aluminium a fused mixture of alumina, CRYOLITE and FLOURSPAR `(CaF_2)` is electrolysed USING graphite as anode and graphite lined iron as cathode. During electrolysis , Al is liberated at the cathode while CO and `CO_2` are liberated at the anode.
At cathode: `Al_(mel t)toAl(1)`
AT anode: `C_(s)+O^(2-)toCO_(g)+2r^(ɵ)`
`C_(s)+2O^(2-)toCO_2+4e^(ɵ)`
If instead of graphite, some metal is used as the anode then `O_2` liberated will not only oxidese the metal of the electrode but would also convert some of the Al liberated at the cathod back to `Al_2O_3`. Since graphite is much cheaper than any metal, therefore graphite is used as the anode, thus the ROLE of graphite in electrometallurgy of Al is to PREVENT the liberation of `O_2` at the anode which may otherwise oxidese some of the liberated Al back to `Al_2O_3`.
Discussion
10704.

What are reducing sugars ?

Answer»

Solution :Carbohydrates which react with Fehling.s solution to give a red PPT of `Cu_(2)O` or with Tollens reagent to give metallic Ag are called reducing sugars. All monosaccharides (both aldoses and ketoses) and disaccharides except sucrose are reducing sugars. Thus, D-(+)-GLUCOSE, D (+)galactose, D-(-)-FRUCTOSE, D-(+)-maltose and D-(+)-lactose are all reducing sugars. Monosaccharides containing keto group also reduce Fehling solution because they exist as EQUILIBRIUM mixture of aldehydic and keto forms. Sucrose is not reducing because the link between glucose and fructose is through aldehydic group.
Discussion
10705.

What is the product when acetylene reacts with hypochlorous acid

Answer»

`CH_3COCl`
`ClCH_2CHO`
`Cl_2CHCHO`
ClCHCOOH

Solution :
Discussion
10706.

Which of the following has highest paramagnetic character?

Answer»

Mn(II)
FE(II)
CO(II)
NI(II)

Answer :A
Discussion
10707.

Whichof the followingyieldyellowprecipitateon reacctionwith I_2 and NaOH?

Answer»

`CH_3 - CHO`
`C_6H_5COC_6H_5`
HCHO
`CH_3OH`

ANSWER :A
Discussion
10708.

What volume of 95% sulphuric acid (density ="1.85 g/cm"^(3)) and what mass of water must be taken to prepare "100 cm"^(3) of 15% solution of sulphuric acid (density = "1.10 g/cm"^(3)) ?

Answer»

Solution :`95% H_(2)SO_(2)` MEANS that `" 95 g of "H_(2)SO_(4)` are present in 100 g of the solution
`"Volume of 100 g of this solution"=("100 g")/("1.85 g cm"^(-1))="54.05 cm"^(3)`
Molarity of `95%H_(2)SO_(4)=("95 g")/("98 g mol"^(-1))xx(1)/("54.05 cm"^(3))xx"1000 cm"^(3)L^(-1)="17.93 M`
`15% H_(2)SO_(4)` means that 15 g `H_(2)SO_(4)` are present in 100 g of the solution
`"Volume of 100 g of solution "=("100 g")/("1.10 g cm"^(-1))="90.01 cm"^(3)`
`"Molarity of 15% "H_(2)SO_(4)=("15 g")/("98 g mol"^(-1))xx(1)/("90.01 cm"^(3))xx"1000 cm"^(3)L^(-1)="1.68 M"`
`"Applying molarity equation"{:(M_(1)xxV_(1),=,M_(2)xxV_(2)),((95%H_(2)SO_(4)),,(15%H_(2)SO_(4))),(17.93xxV_(1),=,1.68xx100 or V_(1)=9.37~="9.4 cm"^(3)):}`
Mass of `100cm^(3)` of `15% H_(2)SO_(4)` to be prepared `=100cm^(3)xx"1.10 g cm"^(-3)="110 g"`
`"Mass of 9.4 cm"^(3)xx"1.85 g cm"^(-3)="17.4 g"`
`THEREFORE"Mass of water to be taken "=110-17.4 g = 92.6 g`
Discussion
10709.

Which state of the triply ionised beryllium, Be^(3+)has the same radius as that of the ground state of hydrogen atom?

Answer»

SOLUTION :SECOND
Discussion
10710.

Wrtie IUPAC names of the following:

Answer»

SOLUTION :N, N-Dimethylanilinium ethanoate.
Discussion
10711.

Wrtie IUPAC names of the following:

Answer»

SOLUTION : 4-Methyoxybenzenamine
Discussion
10712.

What is 'spirit of nitre'? Give its use.

Answer»

Solution :4% solution of ethylnitrite in ALCOHOL is known as sweet spirit of nitre and in USED as DIURETIC.
Discussion
10713.

Which of the following can be prepared by Reimer-Tiesmann reaction directly ?

Answer»




ANSWER :A::B::C
Discussion
10714.

Which of the following complex has minimum magnitude of Delta_(0) ?

Answer»

`[Cr(CN)_(6)]^(3-)`
`[Co(NH_(3))_(6)]^(3+)`
`[CoCl_(6)]^(3-)`
`[Cr(H_(2)O)_(6)]^(3+)`

Solution :`[Cr(CN)_(6)]^(3-)`
`Cr^(3+)=d^(3)=t_(2g)^(3)` CFSE =-`1.2 Delta_(0)`
`[Co(NH_(3))_(6)]^(3+)` (`NH_(3)rarr` Strong FIELD LIGAND)
`Co^(3+)=d^(6)=t_(2g)^(6) e_(g)^(0)` CFSE `=-2.4 Delta_(0)`
`[CoCl_(6)]^(3-)` (`Cl^(-)rarr` weak field ligand)
`Co^(3+)=d^(6)=t_(2g)^(4)e_(g)^(2)` CFSE `=-0.4 Delta_(0)`
`[Cr(H_(2)O)_(6)]^(3+) ""Cr^(3+)=d^(3)=t_(2g)^(3)e_(g)^(0)=-1.2 Delta_(0)`
Hence, minimum CFSE is for `[CoCl_(6)]^(3-)`
Discussion
10715.

Which metal burn in air at high temperature with the evolution of much heat

Answer»

CU
HG
Pb
Al

ANSWER :D
Discussion
10716.

Which is not a pi-bonded complex ?

Answer»

Ziese's salt
Ferrocene
bis(BENZENE) chromium
Tetraethyl lead

Solution :`(ET)_(4)`Pb has `delta`-BOND only.
Discussion
10717.

Which compound is used in cooling :

Answer»

`CHCl_3`
`C Cl_4`
`CF_4`
`CaF_2`

ANSWER :D
Discussion
10718.

Which is NOT the correct statement/s for the nucleophilic reagents? (i) They are electron loving species (ii) They attack the positive centres as they are negatively charged. (iii) They are Lewis acids. (iv)They donate lone pair of electrons

Answer»

(i) and (II)
only (III)
(i) and (iii)
All of these

Answer :C
Discussion
10719.

Which of the following are position isomers ?

Answer»

`CH_3OCH_3` and `C_2H_5OH`
n-butane and isobutane
Ortho-xylene and meta-xylene
None of the above

Answer :C
Discussion
10720.

Which of the following compound react fastest with sodium metal.

Answer»

`H_2O`
`CH_3-OH`
`C_2H_5-OH`
`CH_3-CH_2-CH_2-OH`

ANSWER :A
Discussion
10721.

Unit of ionic mobility is

Answer»

`m^(2)SEC^(-1)"VOLT"^(-1)`
`MS^(-1)`
`"m sec"^(-1)" volt"`
`"m sec"^(-1)" volt"`

ANSWER :A
Discussion
10722.

Write the IUPAC names of the following compounds [CO(NH_3)_5Cl]Cl_2

Answer»

SOLUTION :Pentaamminechlorido COBALT(III) CHLORIDE
Discussion
10723.

Which lipids are structurally similar to soaps? How does lipid bilayer formation protect the cell?

Answer»

SOLUTION :IST part: The POLAR head and non-polar tails of phospholipids are IDENTICAL to the STRUCTURE of soaps.
Discussion
10724.

Van Arkelmethodofrefiningzirconiuminvolves

Answer»

removingall oxygenandnitrogranimpurites
removingCO IMPURITY
removinghydrogenimpurity
REMOVING silicaimpurity

SOLUTION :vanArkelmethodremovesoxygenand nitrogenimpuritesfrom ZIRCONIUM.
Discussion
10725.

Which of the following complexes is least likely to exist ?

Answer»

`Hg(OH)_(4)^(2-)`
`ZN(OH)_(4)^(2-)`
`HgI_(4)^(2-)`
`PtCl_(4)^(2-)`

SOLUTION :`Hg^(2+)` is soft while `OH^(-)` is hard.
Discussion
10726.

Which of the following acids are dicarboxylic acids ?

Answer»

Succoinic ACID
Glutaric acid
Lactic acid
Cinnamic acid

ANSWER :A::B
Discussion
10727.

Two litre solution of a buffer mixture containing 1.0 M NaH_(2)PO_(4) and 1.0 M Na_(2)HPO_(4) isplaced in two compartments (one litre ineach) of an electrolytic cell. The platinum electrodes are inserted in each compartments and 1.25 ampere current is passed for 212 minute. Assuming electrolysis of water onlu at each compartment. What will be pH in each compartment after passage of above charge ?(pK_(a) for H_(2)PO_(4)^(-)= 2.15.)

Answer»


ANSWER :`2.005, 2.295 ;`
Discussion
10728.

Which of the following is a lyophobic colloid?

Answer»

Starch
Sulphur
Gelatin
Cum arabic.

Answer :D
Discussion
10729.

When boron is fused with NaOH, products formed are:

Answer»

 `Na_(2)B_(4)O_(7)`and `H_(2)`
`Na_(2)BO_(2)`and `H_(2)`
 `Na_(3)BO_(3)`and `H_(2)`
`B_(2)O_(3)`and `H_(2)`

ANSWER :C
Discussion
10730.

Which one is CORRECT statement ?

Answer»

BASICITY of `H_3PO_4` and `H_3PO_3`is 3 and 3 respectively.
Basicity of `H_3PO_4` and `H_3PO_3` is 2 and 1respectively.
Basicity of `H_3PO_4` and `H_3PO_3` is 2 and 2 respectively.
Basicity of `H_3PO_4` and `H_3PO_3` is 3 and 2 respectively.

Answer :D
Discussion
10731.

Which bond angle 0 would result in the maximum dipole moment for the triatomic molecule XY_(2) as shown in figure?

Answer»

`90^(@)`
`120^(@)`
`150^(@)`
`180^(@)`

SOLUTION :The dipole moment of two dipoles inclined at an angle `theta` is GIVEN by the equation.
`mu=sqrt(X^(2)+Y^(2)+2XYcos theta)`
`cos90^(@)=0`. As the angle increases from `90^(@)-180^(@)` the valueof `cos theta` becomes more and more -ve and HENCE resultant decreases. Thus, dipole moment is maximum when `theta=90^(@)`
Discussion
10732.

What is the sweetness value of alitame in comparison to sucrose ?

Answer»

160
550
600
2000 

SOLUTION :2000
Discussion
10733.

Which of the following notation shows the product incorrectly?

Answer»

`._(96)Cm^(242) (ALPHA, 2n) ._(97)Bk^(243)`
`._(5)B^(10) (alpha, n) ._(7)N^(13)`
`._(7)N^(14) (n,p) ._(6)C^(14)`
`._(14)Si^(28) (d, n) ._(15)P^(29)`

Answer :a
Discussion
10734.

Which of the following statements is/are correct about slag ?

Answer»

The slag is lighter than molten metal
The calcium silicate, `CaSiO_3` is obtained is slag formation zone in the extraction of iron from haematite ore
In blast furnace/Bessemer converter , the upper layer of molten liquid (i.e. molten metal) is of slag
The slag is fusible MATTER.

Solution :(A)True statement
(B)`CaCO_3 overset(DELTA)toCaO+CO_2`
`CaO+SiO_2 to CaSiO_3`
These reactions take place in slag formation zone at temperature `~~`1275 K
(C ) True statement.
(D)INFUSIBLE matter + Flux =Fusible matter (slag)
Discussion
10735.

Which reagent is used to remove SO_(4)^(2-) and Cl^(-)

Answer»

NAOH
`PB(NO_(3))_(2)`
`BaSO_(4)`
KOH

Answer :B
Discussion
10736.

Which out of carbon and silicon forms multiple bond and why?

Answer»

Solution :CARBON having small atomic size and HIGH ELECTRONEGATIVITY is ABLE to form multiple bonds by `p pi-p pi` OVERLAPPING,
Discussion
10737.

Which is added to foods for their preservation, changing their appeal and improving nutritive value in them?

Answer»

Antioxidants
Food colours
Sweeteners
All of the GIVEN 

SOLUTION :All of the given
Discussion
10738.

When a catalyst increases the rate of a chemical reaction, the rate constant

Answer»

remains constant
increases
decreases
may increase or decrease depending on the order of reaction

Solution :RATE= k [Reactant ]
In the presence of catalyst, at the same concentration of the reactant, as the rate increases, k in CREASES.
Alternatively, `k=Ae^(-E_(a)//RT)` . In presence of catalyst at the same TEMPERATURE, `E_a` decreases. HENCE, k increases.
Discussion
10739.

Which of the follwing reaction s is not sterospecific?

Answer»

`SN^(2)`<BR>Addition of `Br_(2)` to ethyle3ne in `CCl_(4)`

Solution :a. `SN^(2)` is sterospecific and steroselective.
b. Addition of `Br_(2)` is sterospecific , i.e., anti-addtion of two `Br` atoms.
c. `SE` reaction is not sterospecific.
d. Hydroxylation is sterospecific syn-addion of two `(-OH)` groups.
Discussion
10740.

Which of the following Fischer projection formula is same as D-Glyceraldehyde

Answer»




Solution :The configuration in which, OH group are on right SIDE, H-atom are on left side, CHO group are on upper side and `CH_(2)OH` are on lower side found in FISCHER PROJECTION KNOWN as D-configuration.
Discussion
10741.

Which is mot stable conformer among the given conformers?

Answer»





SOLUTION :CONFORMER (D) is most STABLE DUE to HYDROGEN bonding.1
Discussion
10742.

Which of the following is a 3^@ amine?

Answer»

1-methylcyclohexylamine
TRIETHYLAMINE
tert-butylamine
N-methylaniline

Solution :Triethylamine
Discussion
10743.

What happens when phenol is treated with : (a) Zinc dust (b) Br_(2) water (c ) Chromic acid?

Answer»

SOLUTION :
Discussion
10744.

Which of the following compound of xenon possess square pyramidal structure ?

Answer»

`XeO_(2)F_(2)`
`XeOF_(4)`
`XeO_(3)`
`XeF_(6)`

Answer :B
Discussion
10745.

Which of the following pairs has almostsame colours ?

Answer»

`""_(60)ND^(3+)* ""_(69)Tm^(3+)`
`""_(70)YB^(3+), ""_(59)Pr^(3+)`
`""_(63)Eu^(2+), ""_(67)Tb^(3+)`
`""_(64)GD^(3+), ""_(67)Ho^(3+)`

Solution :`Eu^(3+) and tb^(3+)` have the same COLOUR.
Discussion
10746.

Which of the following is not involved in the formation of photochemical smog

Answer»

HYDROCARBON
NO
`SO_(2)`
`O_(3)`

ANSWER :C
Discussion
10747.

(X)overset(KOH)to (Y) (gas turns red litmus blue)+(Z)overset(Zn+KOH)to(Y) (gas). (X)overset(Delta)to gas (does not support combustion) identify (X) to (Z):

Answer»

`X=NH_(4)NO_(2)""Y=NH_(3)""Z=KNO_(2)`
`X=(NH_(4))_(2)Cr_(2)O_(7)""Y=NH_(3)""Z=Cr_(2)O_(3)`
`X=(NH_(4))_(2)SO_(4)""Y=NH_(3)""Z=K_(2)SO_(4)`
`X=NH_(4)NO_(3)""Y=NH_(3)""Z=KNO_(3)`

Answer :A
Discussion
10748.

Which of the following compound shows metamerism ?

Answer»

`CH_3-O-CH_3`
`CH_3-CO-CH_3`
`CH_3NHCH_3`
`CH_3-O-C_3H_7`

ANSWER :D
Discussion
10749.

Which name is given to the elements which are neither metals nor non-metals ?

Answer»

SOLUTION :METALLOIDS.
Discussion
10750.

Which of the following is not green house gas(es) ?

Answer»

`CO_2`
CFCS
`CH_4`
`CH_3Br` vapour

Answer :D
Discussion