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1001.

Which of the following is an amphoteric oxide

Answer»

MGO
`Al_(2)O_(3)`
`Cl_(2)O_(7)`
`Ti_(2)O_(2)`

SOLUTION :`Al_(2)O_(3)` is an AMPHOTERIC oxide.
Discussion
1002.

When phenol on treatment with Br_(2)//H_(2)O readily gives a precipitate of 2,4,6- tribomo phenol.

Answer»

Solution :(i) PHENOL reacts with BROMINE water to GIVE a white precipitate of 2,4,6- tri bromo phenol.

(II) It readily forms tibromo derivatie since it has two-o and one-p positive FREE with respect to OH group.
Discussion
1003.

Which of the following compounds is obtained when calcium acetate is dry distilled ?

Answer»

FORMIC acid
Formandehyde
Acetone
Butanone

Answer :C
Discussion
1004.

Which one of the following metallic hydroxide does not dissolve in sodium hydroxide solution?

Answer»

`FE(OH)_(3)`
`Pb(OH)_(2)`
`Zn(OH)_(2)`
`Al(OH)_(3)`

ANSWER :A
Discussion
1005.

Write the names of biodegradable polymers.

Answer»

Solution :PHBV i.e. Polyhydroxy butyrate `-CO-beta-` HYDROXY valerate. DEXTRON, Nylon - 2 nylon - 6 are biodegradable polymers.
Discussion
1006.

What is the other name for phenol ?

Answer»

SOLUTION :CARBOLIC ACID
Discussion
1007.

Which of the following is a thioacid.

Answer»

`H_(2)S_(2)O_(4)`
`H_(2)S_(2)O_(7)`
`H_(2)S_(2)O_(8)`
`H_(2)SO_(5)`

Answer :A
Discussion
1008.

Which of the following element do not form dpi-p pi

Answer»

N
P
As
Sb

Answer :A
Discussion
1009.

Which of the following is largest ?

Answer»

`CL ^(-)`
`S ^(2-)`
`Na ^(+)`
`F^(-)`

Answer :B
Discussion
1010.

Which of the following can exhibit cis-trans isomerism

Answer»

`HC -= CH`
`CLCH = CHCl`
`CH_(3).CHCl.COOH`
`ClCH_(2)-CH_(2)Cl`

SOLUTION :
Discussion
1011.

When chlorine water is added to an aqueous solution of sodium halide in the presence of chloroform, a violet colouration is obtained. When more of chlorine water is added, the violet colour disappears and solution becomes colourless. This confirms that sodium haides is :

Answer»

chloride
fluoride
bromide
iodide

Answer :D
Discussion
1012.

What do you expect to happen when Red Blood Corpuscles (RBC's) are placed in (i) 1% NaCl solution (ii) 0.5% NaCl solution?

Answer»

Solution :(i) They will SHRINK due to PLASMOLYSIS, (ii) They will swell and may even burst.
This is because RBC's are isotonic with `0.9%` NACL solution.
Discussion
1013.

What is the wavelength of the radiation emitted producing a line in the Lyman Series when an electron falls from fourth stationary state in hydrogen atom? (R_(H)=1.1xx10^(7)m^(-1))

Answer»

96.97nm
969.7nm
9.697nm
None

Answer :A
Discussion
1014.

Which one is the preservative in food industry?

Answer»

SODIUM benzoate
Sodium metabisulphite
Propanoic acid
All of the GIVEN 

SOLUTION :All of the given
Discussion
1015.

Which of the following erelationships are not correct?

Answer»

PH of SOLUTIO in HYDROGEN electrode`=("Electrode potential")/(0.0591)` at 298K
`E_(cell)=(0.0591)/(n)logK_(c)`
Cell cnstant=Conductivity/Conductance
`DELTAG^(@)=nFE_(cell)^(@)`.

Solution :(a) should be:
`pH=("Electrode potential")/(0.0591)` at 298K
(b) should be `E_(cell)^(@)=(0.0591)/(n)logK_(c)`
(d) should be `-DeltaG^(@)=nFE_(cell)^(@)`
Discussion
1016.

What is burnt alum ?

Answer»

Solution :On heating to 475 K POTASH LOSES water of hydration and swells up. The swollen mass is KNOWN as burnt alum.
Discussion
1017.

What do you mean by saying that the molality of a solution is 0.2 m ?

Answer»

SOLUTION :This means that 0.2 MOLE of the solute are DISSOLVED kg of the solvent ?
Discussion
1018.

Urea reacts with malonic ester to give:

Answer»

cyanuric ACID
semicarbazide
urethan
barbituric acid

Answer :D
Discussion
1019.

Which of the following is the odd one out ?

Answer»

POTASSIUM ferrocyanide
Tetramminezinc(II) chloride
Carnellite
Wilkinson's catalyst

Solution :CARNALITE `(KCl.MgCl_2 . 6H_2O)` , is a DOUBLE SALT.
Discussion
1020.

Which one is used as a food preservative

Answer»

SODIUM acetate
Sodium propionate
Sodium benzoate
Sodium oxalate

Answer :C
Discussion
1021.

When 32.25 g of ethyl chloride is subjected to dehydrohalogenation reaction, the yield of alkene formed is 50%. The mass of the product formed is (at mass of chlorine = 35.5)

Answer»

`14g`
`28G`
`64.5g`
`56g`

Solution :`underset("ETHYL chloride")(H-underset(H)underset(|)overset(H)overset(|)(C)-underset(H)underset(|)overset(Cl)overset(|)(C)-H)+KOHtoKCl+H_(2)O+H-underset("Ethene")(underset(H)underset(|)(C)=underset(H)underset(|)(C))-H`
Molar mass of ethyl chloride
`= 2xx12+5xx1+1xx35.5`
`=24+9+35.5=64.5gmol^(-1)`
Molar mass of ethene `=2+12+4xx1`
`=28gmol^(-1)`
Actual yield = 50% of 28 g = 14g
64.5g of ethyl chloride on DEHYDROHALOGENATION gives 14 g ethene
`:.` 32.25 g of ethyl chloride on dehydrohalogenation will GIVE ethene = 7G
Discussion
1022.

Wtite notes on vitamins.

Answer»

Solution :Vitaminis defined as an "accessory food factor which is essential for growth and healthy MAINTENANCE of body".
Classification : Vitamins are broadly CLASSIFIED into TWO MAJOR groups
a) the at soluble Eg : VITAMIN A, D, E and K
b) water soluble Eg: vitamin B - complex and C.
Discussion
1023.

Which of the following is incorrectly matched complex?

Answer»


ANSWER :2
Discussion
1024.

When rate of forward reaction is equal and opposite to the rate of backward reaction, the state is said to be:

Answer»

REVERSIBLE STATE
Equilibrium
CHEMICAL equilibrium
None of the above

ANSWER :C
Discussion
1025.

The values of E_(M^(3+)//M^(2+))^(o) of metals Cr, Mn, Fe and Co are -0.41, 0.57, +0.77 and +1.97 respectively. Then whose oxidation state easily converted into +2 to +3 ?

Answer»

Cr
Mn
Fe
CO

Solution :The METAL which has less REDUCTION potential value will easily converted into +2 to +3.
`Cr^(2+) to Cr^(3+) +E^(-)E_(Cr^(3+)//Cr^(2+))^(@)=-0.41V` Minimum
`Co^(2+)toCo^(3+)+e^(-) E_(Co^(3+)//Co^(2+))^(@)=1.97V` Maximum.
Discussion
1026.

Discuss the nature of bonding and magnetic behaviour in the [FeF_(6)]^(3-) Co-ordination entities on the basis of valence bond theory.

Answer»

6.92 BM
5.92 BM
7.62 BM
3.14 BM

Answer :B
Discussion
1027.

Vinyl derivatives undergo which type of polymerization

Answer»

CATIONIC POLYMERIZATION only
anionic polymerization only
condensations polymerization only
cationic (or) anionic (or)FREE radical polymerization

ANSWER :D
Discussion
1028.

Which one of PCl_(4)^(+) and PCl_(4)^(-) is not likely to exist and why?

Answer»

<P>

SOLUTION :`PCl_(4)^(-)`, because P has 10 ELECTRONS which cannot be accommodated in `sp^(3)` HYBRID orbitals.
Discussion
1029.

Which of the following does not contain Mg ?

Answer»

MAGNETITE
Magnesite
Asbestos
Carnallite

Answer :A
Discussion
1030.

which is used in motion picture films

Answer»

CELLULOSE acetate
glucose acetate
starch acetate
sucrose acetate

Answer :A
Discussion
1031.

The stability of +1 oxidation state among Al,Ga,In and Tl increases in the sequence

Answer»

GaltInltAlltTl
AlltGaltInltTl
TlltInltGaltAl
InltTlltGaltAl

Answer :B
Discussion
1032.

Which of the following is used in electroplating?

Answer»

AGCL
`AgNO_3`
SODIUM argentocyanide
NONE of these

Answer :C
Discussion
1033.

Write the oxidation states of Europium (At. No. 63).

Answer»

SOLUTION :+ 2 and + 3.
Discussion
1034.

Which of the following order is incorrect :-

Answer»

`MCl lt MCl_(2) lt MCl_(3)`, Ionic CHARACTER<BR>`F^(-) lt Cl^(-) lt Br^(-) lt I^(-)`,Polarisibility
`Na^(+) lt Ca^(+2) lt Mg^(+2) lt Al^(+3)`, POLARISING POWER
`LiF lt LiCl lt LiBr lt LiI`,COVALENT character

Answer :A
Discussion
1035.

Which of the following transformations is not correct?

Answer»

`""_(3)^(7)Li+""_(1)^(1)Hto""_(4)^(7)Be+""_(0)^(1)N`
`""_(5)^(10)B+""_(2)^(4)Heto""_(7)^(13)N+""_(0)^(1)n`
`""_(83)^(209)Bi+""_(1)^(2)Hto""_(84)^(210)Po""+""_(0)^(1)n`
`""_(13)^(27)AL+""_(1)^(2)Hto""_(12)^(25)Na+""_(2)^(4)He`

Answer :D
Discussion
1036.

Which of the following statements is right regarding cis and trans-1,4- dibromo cyclohexane

Answer»

They are diastereoisomers
Both are optically inactive
Trans - COMPOUND is more STABLE than CIS compound
Cis-compound is more stable than trans-compound

Solution :Cis and trans-1,4 dibromo cyclohexanes are diastereoisomers both are optically inactive but to ABSENCE of chairal centre transform is more stable than cis FORM structures.
Discussion
1037.

The rise in the boiling point of a solution containing 1.8 gram of glucose in 100g of a solvent is 0.1^(@)C. The molal elevation constant of the liquid is

Answer»

0.01 K/m
0.1 K/m
1 K/m
10 K/m

Solution :`K_(B)=(DELTA T_(b))/(m)=(0.1xx100)/((1.8)/(180)xx1000)=1 K//m`.
Discussion
1038.

Write the use of aniline.

Answer»

SOLUTION :It is used .
(i) in the preparation of dyes and dye INTERMEDIATES .
(ii) in the MANUFACTURE of sulpha drugs .
(iii) as a solvent in rubber INDUSTRY .
Discussion
1039.

What happens when thionyl chloride is treated with methanol?

Answer»

SOLUTION :`UNDERSET("Methanol")(CH_3OH)underset("Trionyl CHLORIDE")(+SOCl_2) overse("Pyridine")tounderset("CHLORO methane")(CH_3Cl +)HCl + SO_2uarr`
The above reaction follows `SN^2` mechanism in the presence of pyridine.
Discussion
1040.

Which one is not synthetic sweeteners ?

Answer»

Sucrolose
Alitame
SODIUM BENZOATE
Aspartame 

SOLUTION :Sodium benzoate
Discussion
1041.

What is hypo?

Answer»

SOLUTION :HYPO is `Na_2S_2O_3.5H_2O`
Discussion
1042.

What are interstitial compounds?Write any two characteristics of interstitial compounds.

Answer»

SOLUTION :The compounds FORMED by the trapping of small atoms like H,C, N etc. into the crystal LATTICE or metals.
Characterstics.
1. High m.p. than the pure metal.2. Very Hard
3. Chemically inert4. Retain metaalic conductivity(any TWO).
Discussion
1043.

Which thermodynamic property is significant in study of Ellingham diagram ?

Answer»

Enthalpy
ENTROPY
Fugality
GIBB's energy

Solution :Graphs are `DeltaG^(@)` vs T
Discussion
1044.

Which is the product when phenol is reacts with Br_(2), in presence of carbon disulphide at 273 - 278 K temperature ?

Answer»

4- bromophenol
2 - bromophenol
3 bromophenol
None of these

Solution :
Discussion
1045.

What is bio-degradeable polymers ? Give example.

Answer»

SOLUTION :SYNTHETIC POLYMERS which undergo bacterial degradation in the environment, are known as BIODEGRADABLE synthetic polymers. E.g : POLY B- hydroxybutane-CO-`beta`-hydroxyl valerate (PHBV)
Discussion
1046.

The roasting reaction in the metallurgy of Cu is

Answer»

`CuFeS_(2) to CuO+ Fe_(2)O_(3) +SO_(2)`
`2CuFeS_(2)+O_(2) to Cu_(2)S+2FeS+O_(2)`
`CuFeS_(2)to Cu_(2)O +Fe_(2)O_(3) +SO_(2)`
NONE of the above

SOLUTION :`2CuFeS_(2) +4O_(2) overset (5[O])to Cu_(2)S+2FeS+SO_(2)`is the ROASTING reaction in Cu metallugy .
Discussion
1047.

The values of dissociation constant of [Cu(NH_(3))_(4)]^(2+) and [Co(NH_(3))_(6)]^(3+) are 1.0 xx 10^(-12) and 6.2 xx 10^(-36), respectively. Which complex would be more stable and why ?

Answer»

Solution :`[CO(NH_(3))_(6)]^(3+)` is more STABLE because it has low VALUE of DISSOCIATION constant. It will have high stability constant.
Discussion
1048.

Vitamin D deficiency causes

Answer»

Sterility
Xerophthalmia
Rickets
Beriberi 

ANSWER :C
Discussion
1049.

Which halogen shows only one oxidation number in its compounds ?

Answer»

SOLUTION :FLUORINE i.e. -1
Discussion
1050.

The total number of alkenes possible by dehydrobromination of 3-bromo-3-cyclopentylhexane using alcoholic KOH is

Answer»


Solution :3-Bromo-3-cyclopentylhexane has THREE different types of `alpha`-hydrogens marked as (a), (b) and (c) and HENCE can give three structurally isomeriic alkenes. But TWO of these can exhibit geometrical isomerism. Therefore, the total NUMBER of alkenes possible are five as hown below:
Discussion