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7601.

Which of the following compounds will give iodoform test:

Answer»

`HCHO`
`(CH_3)_2CHCHO`
`(CH_3)_3C COC(CH_3)_3`
`(CH_3)_2CH COCH_3`

Solution :methyl ALCOHOL
Discussion
7602.

Which metal does not react with water or steam ?

Answer»

K
Na
Ca
Cu

Answer :D
Discussion
7603.

Which type of aldehyde can go Cannizzaro reaction ?

Answer»

SOLUTION :Aromatic and ALIPHATIC aldehydes which do not contain `ALPHA`-hydrogen.
Discussion
7604.

Zinc can be coated on iron to produce galvanised iron but the reverse is not possible. It is because

Answer»

ZINC is lighter than iron
zinc has LOWER MELTING point than iron
zinc has lower negative electrode potential than iron
zinc has higher negative electrode potential than iron

Solution :Zinc has higher negative electrode potential than iron, so iron cannot be COATED on zinc.
Discussion
7605.

The standard free energy changes (Delta G^(theta)) is related to equilibrium constant (K) as

Answer»

`DELTA G^(theta) = -2.303 RT ln K`
`Delta G^(theta) = 2.303 RT LOG K`
`Delta G^(theta) = -2.303 RT log K`
`Delta G^(theta) =RT log K`

Answer :C
Discussion
7606.

Write down the IUPAC name of [CO(NH_(3))_(2)Cl(en)_(2)]Cl_(2)

Answer»

Solution :The approach is same as the earlier one with the EXCEPTION that in case of -en which is actually ethylenediamine the term bis is USED to INDICATE two - en groups instead of BI The name is Diainminechlorobis (ethylenediamine) COBALT(iii) chloride
Discussion
7607.

Which of the following statement are correct regarding the simultaneous solubility of AX_2 and BX_2 in water at 25^@ C ? [Given K_(sp)(AX_2)=3.888xx10^(-9), K_(sp)(BX_2)=1.944xx10^(-8)]

Answer»

The concentration of `X^-` ion in the solution is `1.296xx10^(-5)M`
The simultaneous solubility of `AX_2` is `3xx10^(-4)M`
The simultaneous solubility of `BX_2` is `1.5xx10^(-3)M`
The concentration of `X^-` ion in the solution is `7.2xx10^(-3)M`

Solution :`(K_(sp)(AX_2))/(K_(sp)(BX_2))=(3.888xx10^(-9))/(1.944xx10^(-8))=1/5=S/(5S)`
`AX_2hArr undersetSA^(2+)+UNDERSET(2S+10S)(2X^(-))`
`BX_2hArr underset(5S)B^(2+)+underset(10S+2S)(2X^(-))`
`K_(sp)(AX_2)=S(12S)^2=3.888xx10^(-9) :. S=3xx10^(-4)M`
Solubility of `BX_2=5S=1.5xx10^(-3) M`
`[X^(-)]=12S =3.6xx10^(-3)M`
Discussion
7608.

Write two basic requirements for refining of a metal by Mond process and by van Arkel method.

Answer»

SOLUTION :For both the processes, the BASIC requirements are:
(i) The metal should FORM a volatile compound with an available reagent.
(II) The volatile compound should be easily decomposable for easy RECOVERY of the metal.
Discussion
7609.

Which of the following is correct for electron gain enthalpy (with -ve sign) of halogens?

Answer»

`BR gt F`
`Br gt CL`
`F gt I`
`F gt Cl`

ANSWER :C
Discussion
7610.

Which reducing agents are employed to get copper from the leached low grade copper ore ?

Answer»

SOLUTION :IRON or HYDROGEN GAS.
Discussion
7611.

The tendency for bonding to itself in chains (Catenation) is more in:.

Answer»

N
P
S
C

Answer :C
Discussion
7612.

Which of the following sets does contain only addition homopolymers?

Answer»

POLYTHENE, NATURAL rubber, cellulose
Starch, nylon, polyester
Teflon, Buna-S, orlon
NEOPRENE, PVC, polythene

Solution :Neoprene, PVC, polythene
Discussion
7613.

Which of the following statements are correct about the mechanism of this reaction?

Answer»

A carbocation will be formed as an intermediate in the reaction.
`OH^(-)` will ATTACH the SUBSTRATE (ii) from one side nd `CL^(-)` will leave it simultaneously from the other side.
An unstable intermediate will be formed in which `OH^(-) and Cl^(-)` ions will be attached by weak bonds.
Reaction proceeds through `S_(N^(1))` MECHANISM.

Solution :(a,d) are both correct statements. A carbocation intermediate is formed and the reaction proceeds by `S_(N^(1))` mechanism.
Discussion
7614.

Which of the following metals when coupled will give maximum e.m.f. for a voltaic cell ?

Answer»

FE and Cu
Ca and Cu
Cu and Au
Pb and Au

Solution :(a) Fe and Cu=0.34 -(-0.44)=0.18 V
(B) Ca and Cu =0.34-(-0.44)=0.18 V
(C)Cu and Au=1.42 -0.34 =1.08 V
(d) Pb and Au=1.42 -(-0.13)=1.55V
Discussion
7615.

The wire of flash bulb is made of

Answer»

Mg
Cu
Ba
Ag

Solution :Magnesium burns with an intenselight. THEREFORE Mg is USED in flash BULBS for photography , fireworks and SIGNAL fires.
Discussion
7616.

The vitamin that is not soluble in water is

Answer»

VITAMIN `B_1`
Vitamin `B_2`
Vitamin `B_6`
Vitamin C

Solution :Vitamin D is not SOLUBLE in WATER. It is a FAT soluble vitamin.
Discussion
7617.

Which reaction can be used to convert propanone to propane ?

Answer»

SOLUTION :CLEMMENSEN REDUCTION
Discussion
7618.

Write short note : Buna - N

Answer»

Solution :Buna-N is obtained by the copolymerization of 1,3-butadiene and acrylonitrile in the presence of a peroxide catalyst.

It is resistant to the action of PETROL, lubricating oil and ORGANIC solvents is used in MAKING oil seals, TANK LINING, etc.
Discussion
7619.

Which hydrocarbon will react with NaNH_2to form sodium salt:

Answer»

Benzene
Ethane
Ethene
Acetylene

Answer :D
Discussion
7620.

Whichof the followingpractices will notcomeundergreenchemistry ?

Answer»

Ifpossiblemakinguse of soapmadeof vegetable oilsinstead of usingsyntheticdetergents.
USINGS `H_(2) O` forbleachingpurposeinsteadof usingchlorinebasedbleachingagents
Usingbicycle for travellingsmalldistances INSTEADOF usingpetrol`//`dieaselbasedvehicles .
using plastic cans for NEATLY storing substance

SOLUTION :Peroxyacetylnitrateis a secondarypollutantwhichis formedfromprimarypollutionsuch as`NO_(2) . O_(3)` and hydrocarbons.
Discussion
7621.

Which statement is false regarding acetaldehyde and acetone ?

Answer»

Both reduce ammonical silver NITRATE to silver mirror
Both react with HYDROXYLAMINE to form oximes
Both react with HYDRAZINE to form hydrazone derivative
Both react sodium BISULPHITE to form ADDITION product

Answer :A
Discussion
7622.

Which of the following represents a chemical change ? 1 . Magnetization of iron 2. Condensationof liquid 3. Burning of fuel 4. Rusting of iron Select the correct answer using the code given below : Code :

Answer»

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

Solution :During a chemical change a substance loses its identity and changes into a NEW substance whose chemical composition and properties are different .
BASED on above fact , BURNING of fuel and rusting of iron show chemical change.
Discussion
7623.

Which of the following reactions of acetic acid involves C - OH bond ?(I)Action of Na (II) Formation of acid chloride (III) Action with NaHCO_3 (IV)Formation of an ester

Answer»

I, II
II, III
III, IV
II, IV

Answer :D
Discussion
7624.

Whichis the chief ore of copper ?

Answer»

Galena
Copper pyrites
Sphalerite
SIDERITE

ANSWER :B
Discussion
7625.

The standard free energy change of a reaction is Delta G^(@)=-115kJ at 298 K. Calculate the equlibrium constant K_(p)"in"logK_(p)(R=8.314jK^(-1)mol^(-1))

Answer»

<P>`20.16`
`2.303`
`2.016`
`13.83`

SOLUTION :The STANDARD free energy change of a reaction `DELTAG^(@)=-2.303RTlogK_(p)`
`-115xx10^(3)=-2.303RT log K_(p)`
`logK_(p)=(115xx10^(3))/(2.303xx8.314xx298)logK_(p)=20.16.`
Discussion
7626.

Which of the following compounds will not undergo Friedel-Crafts reaction easily?

Answer»

Nitrobenzene
Toluene
Cumene
Xylene

Solution :`-NO_(2)` is a POWERFUL deactivating group. It reduces the ELECTRON density in the benzene ring CONSIDERABLY. As a RESULT, it does not undergo F.C. reactions.
Discussion
7627.

Which one hasthe minimumsolubilityproduct ?

Answer»

`AgCI`
`AICI_(3)`
`BaCI_(2)`
`NH_(4)CI`

Answer :a
Discussion
7628.

Write the components which on claisen condensation could be used to prepare the following esters.

Answer»


SOLUTION :`(a) PH-CH_(2)-underset(O)underset(||)(C)-OCH_(3)+H-underset(O)underset(||)(C)-OR OVERSET(EtO^(Theta))toH-overset(O)overset(||)(C)-underset(Ph)underset(|)(C)H--overset(O)overset(||)(C)-OCH_(3)`
Discussion
7629.

Which of the following sequence is correct here?

Answer»

`Tl LT LN lt Ga lt Al` (stability of + 1 OXIDATION STATE)
`CO_2 lt SiO_2 lt SnO_2 lt PbO_2` (increasing oxidising power)
`BF_3 lt BCl_3 lt B Br_3 lt Bl_3` (the lewis acid strength)
Both B and C

Answer :D
Discussion
7630.

Which one is least soluble in water:

Answer»

`BaF_2`
`CaF_2`
`SrF_2`
`MgF_2`

ANSWER :A
Discussion
7631.

Which ionisation potential (IP) in the following equations involves the greatest amount of energy

Answer»

`NararrNa^(+)+e^(-)`
`K^(+)rarrK^(2+)+e^(-)`
`C^(2+)rarrC^(3+)+e^(-)`
`CA^(+)rarrCa^(2+)+e^(-)`

SOLUTION :`K^(+)rarrK^(2+)+e^(-)`.SINCE `e^(-)` is to be removed from stable configuration.
Discussion
7632.

Which of the following is not a cyclic compound ?

Answer»

ANTHRACENE
Pyrrole
Isobutylene
Phenol.

ANSWER :C
Discussion
7633.

Which one of the following polymers may be classified as step growth polymer ?

Answer»

Teflon
Polythene
PVC
Nylon-6, 6

Solution :STEP GROWTH polymers (or CONDENSATION polymers) are prepared by reaction between two FUNCTIONAL groups and thereby eliminating small molecules during polymerization. Nylon-6,6 is an example of step growth polymer.
Discussion
7634.

When K_2CrO_4 is added to CuSO_4 solution, there is formation of CuCrO_4 as wel as CuCr_2O_7. Formation of CuCr_2O_7 is due to

Answer»

BASIC nature of `CuSO_4` solution
ACIDIC nature of `CuSO_4` solution
`CuSO_4` oxidizes `CrO_4^(-2)` to `Cr_(2)O_(7)^(-2)`
This is the typical property of `CuSO_4`

Solution :Due to Acidic nature of `CuSO_4 , CrO_(4)^(-2)OVERSET(H^+)rarr Cr_2O_7^(-2)`
Discussion
7635.

The total number of possible aldohexoses belonging to D-series is

Answer»


Solution :In all 16 ALDOHEXOSES are possible. Out of these 8 BELONG to D-series and 8 to the L-series.
Discussion
7636.

Which one of the following is used in orthopaedic devices and in controlled release of drugs?

Answer»

PHB
PHBV
PGA
PLA

Solution : PHBV
Discussion
7637.

The SI unit of radioactivityis curie.

Answer»


ANSWER :F
Discussion
7638.

x = Number of structural isomer of C_(4)H_(10)O reacts with PhMgBr to gave as a product.

Answer»

3
4
5
6

Solution :`LOG K=logA-(E_(a))/(2.303RT)`
`k=(0.693)/(t_(1//2))=(0.693)/(693)=10^(-3)s^(-1)`
`-3=13-(23.03xx1000)/(2xx2.303xxT),16=(5000)/(T),T=312.5K`
Discussion
7639.

Water gas is produced by:

Answer»

PASSING steam through a red HOT coke bed
Saturating HYDROGEN with moisture
Mixing oxygen and hydrogen in the ratio of `1:2`
HEATING a mixture of `CO_2` and `CH_4` in petroleum refineries

Answer :A
Discussion
7640.

Which one is electrophilic addition

Answer»

`CH_(3)-CH_(3)+Cl_(2) rarr C_(2)H_(5)Cl + HCL`
`CH_(3)CH=O+HCN rarr (CH_(3))_(2)C(OH)CN`
`(CH_(3))_(2)C=O + HCN rarr CH_(3)CH(OH)CN`
`CH_(2) = CH_(2) + Br_(2) rarr CH_(2)BrCH_(2)Br`

Solution :Halogenation on alkene occurs by electrophilic addition.
Discussion
7641.

Which of the following reaction regarding the preparation of hydrogen halide is not correct ?

Answer»

`CaF_(2)+H_(2)SO_(4) underset("Conc")to CaSO_(4)+2HF`
`NaCl+H_(2)SO_(4) underset("conc")to NaHSO_(4)+HCl`
`NaBr+underset("conc")(H_(2)SO_(4)) to NaHSO_(4)+HBR`
`PI_(3)+3H_(2)O to H_(3)PO_(3)+3HI`

Solution :SULPHURIC acid oxidises `HBr or HI` to `Br_(2) or I_(2)` the halides HBr and HI can be prepared by the hydrolysis of phosphorous tri halides with cold water
`PX_(3)+3H_(2)O to H_(3) O_(3)+3HX`
`X=Br or I`
Discussion
7642.

Which of the following chemical system is non aromatic

Answer»




SOLUTION :HUCKEL RULE is not obeyed. No CONTINUOUS CONJUGATION
Discussion
7643.

The 'spin only' magnetic moment (in units of Bohr magneton, mu_(B)) of Ni^(2+) in aqueous solution would be (atomic number Ni=28)

Answer»

`2.84`
`4.80`
0
`1.73`

Solution :`[Ni(H_(2)O)_(6)]^(2+)`
`d^(8)" ",2u.p.e^(-)`
Discussion
7644.

Which of the following properties of white phosphorus is shown by red phosphorus also ?

Answer»

It is SOLUBLE in `CS_2`
It produces phosphorescence in air
It forms `PH_3` with BOILING KOH
It BURNS on warming

Answer :D
Discussion
7645.

What is the symbol for the nucleus remaining after ._(20)Ca^(42) undergoes beta-emission

Answer»

`._(21)Ca^(42)`
`._(20)SC^(42)`
`._(21)Sc^(42)`
`._(21)Sc^(41)`

Solution :`._(20)Ca^(42) rarr ._(21)Sc^(42) + ._(-1)E^(0)`
Discussion
7646.

The sulphur present in an organic compound is oxidised by fuming nitric acid into :

Answer»

`SO_2`
`H_2So_4`
`H_2S`
S

Answer :B
Discussion
7647.

What is the formula of adipic acid :

Answer»

`COOH(CH_2)_4COOH`
`CH_2(COOH)CH_2COOH`
`COOH(CH_3)_3COOH`
None

Answer :A
Discussion
7648.

The time for 90% of a first order reaction to complete is approximately

Answer»

1.1 TIMES that of HALF-LIFE
2.2times that of half- life
3.3 times that of half-life
4.4 times that of half-life.

ANSWER :C
Discussion
7649.

The reducing agent added in the extraction of Iron from oxide ore of iron is

Answer»

coke
Aluminium
CARBON MONOXIDE
ZINC

ANSWER :A
Discussion
7650.

Which series of elements have nearly the same atomic radii ?

Answer»

F, CL, BR, l
Na, K, Rb, Cs
Li, Be, B,C
Fe, Co, Ni, Cu

Answer :D
Discussion