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16501.

Which of the following has three centre electron pair bond ?

Answer»

`[BF_(4)]^(-)`
`B_(2)H_(6)`
`H_(3)BO_(3)`
`Al(OH)_(4)^(-)`

Solution :Diborane `(B_(2)H_(6))` has three centre electron pair bond.
Discussion
16502.

Which of the following is used as an insecticide?

Answer»

`CHCl_(3)`
`"CCl"_(3).NO_(2)`
`"COCl"_(2)`
`CH_(2)Cl_(2)`

ANSWER :B
Discussion
16503.

What is the oxidation state of chlorine in HClO_(4) ?

Answer»


SOLUTION :The OXIDATION state of Cl in `HClO_(4)` is +7.
Discussion
16504.

Which one of the following statement for order of reaction is not correct….

Answer»

order can be determined experimentally
order of reaction is equal to SUM of the powers of concentration terms in DIFFERENTIAL rate law.
it is not AFFECTED with the STOICHIOMETRIC coefficient of the reactants
order cannot be fractional

Answer :D
Discussion
16505.

Which will liberate ammonia when boiled with NaOH solution?

Answer»

ETHYLAMINE
Acetamide
Aniline
All of these

Answer :B
Discussion
16506.

What is the decreasing order of strength of bases? OH^-,NH_2^-,H-C-=C^(-) andCH_3-CH_2^(-)

Answer»

`OH^(-) gtNH_2^(-) GT H-C-=C^(-) gtCH_3-CH_2^-`
`NH_2^(-) gt OH^(-) gtCH_3^(-)-CH_2^(-) gtH-C-=C^-`
`CH_3-CH_2 -gtNH_2^(-) gtH-C-=C^(-) gtOH^-`
`OH^(-) gtH-C-=C^(-) gtCH_3-CH_2-gtNH_2^-`

Solution :Acid STRENGTH decreases in order
`HOH gt CH-=CH gt NH_3 gt CH_3CH_3`
Its CONJUCATE bases are in the reverse order
`CH_3-CH_2 -gtNH_2^(-) gtH-C-=C^(-) gtOH^-`
Discussion
16507.

Which of the following organic compounds answers both Iodoform test and Fehlings test

Answer»

propanone
ethanal
methanal
ethanol

SOLUTION :Iodoform test is given by the compounds which have `CH_(3) - overset(overset(O)(||))(C )-` grouping or which are able to FORM this group. Fehling solution is REDUCED only by ALDEHYDES.
Discussion
16508.

Which of the following statement is/are incorrect in the rock-salt structure if an ionic compounds ? (A) coordination number of cation is four where as that of anion is six.

Answer»

coordination number of CATION is FOUR where as that of anion is SIX.
coordination number of cation is six where as that of anion is four.
coordination number of each cation and anion is four.
coordination number of each cation and anion is six.

Answer :A::B::C
Discussion
16509.

While 'He' is allowed to expland through a small jet under adibatic condition heating effectt is observed. This is due to the fact that:

Answer»

Helium is an INERT gas
Helium is a NOBLE gas
Helium is an IDEAL gas
The INVERSION temperature of helium is very low.

Answer :D
Discussion
16510.

What happens when H_2Sgas is passed through ammoniacal solution of MnCl_2

Answer»

SOLUTION :FLESH like PRECIPITATE of MNS are formed.
`MnCl_2 + H_2S RARR MnS + 2HCl`
Discussion
16511.

Write equations for the steps in SN^1 mechanism of the conversion of tert.butyl bromide into tert.butyl alcohol.

Answer»

Solution :When t-buty BROMIDE REACTS with aqueous potassium HYDROXIDE, t-butyl alcohol

Step 1: The alkyl HALIDE undergoes slow ionisation to form a carbocation and bromide ion.

Step 2: The nucleophite `OH^-` attacks the carbocation to form TERTIARY buty alcohol.
Discussion
16512.

Which ofthe followingis usedin thermicwelding ?

Answer»

`TiO_ 2+4 Na toTi +2 Na _ 2 O`
`2Al + Fe_2 O_3 toAl_2 O_ 3 +2 Fe`
`Sn O_2 +2 C toSn +2 CO`
` Cr_2O_ 3 +2 Al to Al_2 O_3+2 CR`

Solution : `2Al +Fe _2O_ 3toAl _ 2O_ 3+2Fe`
Discussion
16513.

Two moles of an ideal gas are allowed to expand from a volume of 10 dm^(3) to 2m^(3) at 300 K against a pressure of 101.325 kPa. Calculate the work done.

Answer»

<P>`-201.6` kJ
`13.22` kJ
`-810` J
`-18.96` kJ

Solution :`V_(1) = 10 DM^(3) = 10p^(-2) m^(3)`
`V_(2) = 2m^(3)`
P=`101.325 xx 10^(3)` Pa
`W= P DeltaV = -101. 325 xx 10^(3)(2-0.01)`
`=-201.6` kJ
Discussion
16514.

What are analgesics ? Give one example for non-narcotic analgesic.

Answer»

Solution :DRUGS that are employed to RELIEVE pain are CALLED analgesics. Example for non-narcotic ANALGESIC is Aspirin.
Discussion
16515.

Which of the following elements shows maximum number of different oxidation states in its compounds ?

Answer»

Eu
La
Gd
Am

Answer :C
Discussion
16516.

Which statement about aspirin is not true ?

Answer»

Aspirin belongs to NARCOTIC ANALGESICS.
It is EFFECTIVE in relieving pain.
It has anti-blood clotting action.
It is a neurologically active drug. 

Solution :Aspirin belongs to narcotic analgesics.
Aspirin is non-narcotic analgesic drug.
Discussion
16517.

Write the structure of the major organic product in each of the following reactions : (a) (CH_(3))_(3)CBr + H_(2)O overset("heat") to (b) (CH_(3))_(2)CH - CH(Br)CH_(2)CH_(3) underset("ethanol /heat") overset(C_(2)H_(5)ONa) to (c) CH_(3)CH_(2)Cl + SbF_(3) overset("heat") to (d) CH_(2) = CHCH_(2)Br + CH_(3)C -= CNa overset("liq."NH_(3))to

Answer»

Solution :`(a) UNDERSET("Butyl bromide") ((CH_(3))_(3)CBr)+ H_(2)O overset("HEAT") to underset("tert. butyl alcohol") ((CH_(3))_(3)C - OH + HBr) `
`(b) CH_(3) - underset(CH_(3))underset(|)(CH) - overset(Br) overset(|)(CH) - CH_(2)- CH_(3) underset("ethanol/heat") overset(C_(2)H_(5)ONa) to underset(("Saytzef Rule"))underset("More branched alkene ")(CH_(3) - underset(CH_(3))underset(|)C = CH - CH_(2) - CH_(3)) + NaBr + C_(2)H_(5)OH `
`(c) 3CH_(3)CH_(2)Cl + SbF_(3) overset("heat") to 3CH_(3)CH_(2)F + SbCl_(3) `
`(d) CH_(2) = CH - CH_(2)Br + CH_(3)C -= CNa overset("liq."NH_(3)) to CH_(2) = CH - CH_(2) - C -= C - CH_(3) + NBaBr `
Discussion
16518.

Which of anions in the Column-I shows one or more observations from the column-II. {:(,"Column-I",,"Column-II"),((A),S^(2-),(P),"White ppt. with "AgNO_(3)),((B),NO_(2)^(-),(Q),"Evolution of pungent smell gas with"),((C),SO_(3)^(2-),(R),"Brown fumes with conc. "H_(2)SO_(4)" (hot)"),((D),CH_(3)COO^(-),(S),"Decolourises acidified "KMnO_(4)):}

Answer»


ANSWER :`A-S; B-PQRS; C-PS; D-P`
Discussion
16519.

What are non - essential amino acids? Name naturally occurring cc - amino acid which is not optically active.

Answer»

SOLUTION :The amino ACID which synthesised on the body is CALLED NON essentially amino acids. Glycine is optically is active naturally OCCURRING amino acid.
Discussion
16520.

Which of thefollowing is not known ?

Answer»

`K_2O`
`K_2O_2`
`KO_4`
`KO_3`

ANSWER :C
Discussion
16521.

Total number of optically active stereoisomers of tartaric acid is

Answer»

2
4
3
0

Answer :A
Discussion
16522.

What are sulpha drugs ? Give two examples.

Answer»

SOLUTION :A group of drugs which are DERIVATIVES of sulphanilamide and are used in place of antibiotics is CALLED sulpha drugs. E.g., sulphadiazine, sulphanilamide.
Discussion
16523.

When fruits and vegetables that have dried are placed in water, they slowly swell and return to the original form. Explain why? Would a temperature increase accelerate are process? Explain.

Answer»

SOLUTION :The cell WALLS of the fruits and vegetables have semi-permeable membrane. When they have dried, concentration inside is higher. On placing in water,water enters into the cells, i.e., osmosis takes place. Hence, they swell and return to the original form. The process will be accelerated with INCREASES of TEMPERATURE because osmosis becomes faster with increase of temperature.
Discussion
16524.

Which typeof polymeris the buna-S rubber ?

Answer»

COPOLYMER
addition POLYMER
CONDENSATION polymer
It is not a polymer

SOLUTION :Buna-S RUBBER is a copolymer .
Discussion
16525.

X H_(5)IO_(6) overset( 100^(@)C ) ( rarr) Y HIO_(4) overset( 200^(@) C) ( rarr) Z I_(2) o_(5) + H_(2)O what is Y.

Answer»


Solution :`2H_(5)IO_(6) overset( 100^(@)C)(rarr)2HIO_(4) overset( 200^(@)C)(rarr) I_(2)O_(5) + H_(2)O + O_(2) , y = 2 `
Discussion
16526.

The sodium extract of an organic compound on acidified with acetic acid and addition of lead acetate solution gives a back precipitate. The organic compound contains :

Answer»

NITROGEN
HALOGEN
Sulphur
Phosphorous

ANSWER :C
Discussion
16527.

Which of the metal chloride is insoluble in cold water but dissolves in hot water ?

Answer»

`BiCl_(3)`
`SnCl_(4)`
`PbCl_(2)`
`AgCl`.

ANSWER :C
Discussion
16528.

Which one of the following has a square planar geometry ? [At. no. Co=27, Ni=28, Fe=26, Pt=78]

Answer»

`[NiCl_(4)]^(2-)`
`[PtCl_(4)]^(2-)`
`[CoCl_(4)]^(2-)`
`[FeCl_(4)]^(2-)`

Answer :B
Discussion
16529.

Three lines are drawn from a single corner of an FCC unit cell to meet the other such that they are found to pass through exactly only 1 octahedral void, no voids of any type and exactly 2 tetrahedral voids with 1 octahedral void.Identify the line in the same order.

Answer»

EDGE, FACE DIAGONAL , BODY diagonal
Face diagonal , Edge , Body diagonal
Body diagonal , Face diagonal , Edge
Edge , Body diagonal , Face diagonal

Solution :
Discussion
16530.

Which of the following is zero for an isochoric process

Answer»

dP
dV
dT
dE

Solution :dV=0 for an ISOCHORIC PROCESS.
Discussion
16531.

Which of the folliwng is the correct IUPAC name for the compound given in above question?

Answer»

6-mercapt o-4-cyclohexene-1,3-diol
4-mercapto-5-cyclohexene-1-3-diol
2,4-dihydroxy-5-cyclohexene-1-mercaptan
4,6-dihydroxy-2-cyclohexene-1-mercaptan

Answer :a
Discussion
16532.

Which is highest melting point halide ?

Answer»

NaCl
NaBr
NaF
Nal

Answer :C
Discussion
16533.

While separating a mixture of ortho and para nitrophenols by steam distillation, name the isomer which will be steam volatile. Give reason.

Answer»

Solution :`to` The o-NITROPHENOL shows lower boiling POINT than para nitrophenol because of intramolecular H-bonding in the former case. THUS, o-nitrophenol will be STEAM volatile. The molecules of p-nitrophenols are STRONGLY associated by intermolecular H-bonding, as a result of which it shows higher boiling point.
Discussion
16534.

Which of the following give (s) chloropicrin on chlorination?

Answer»

`CH_(3)-NO_(2)`
`CH_(3)-CH_(2)-NO_(2)`

`CH_(3)CH_(2)CH_(2)NO_(2)`

Solution :`CH_(3)-NO_(2)overset(Cl+NaOH)toCl_(3)C-NO_(2)`
Discussion
16535.

Which is not decomposed by dil. H_2SO_4

Answer»

Chloride
Carbonate
Nitrite
Acetate

Answer :A
Discussion
16536.

The term carboxylic is a contraction of two terms :

Answer»

CARBONYL and AMINE
Carbonyl and hydroxyl
Hydroxyl and carboxylic
carboxylic and hydroxyl

Answer :B
Discussion
16537.

The standard enthalpy of combustion of formaldehyde Delta_(c)H^(@)=-571kJ. How much heat will be evolved in the formation of 22 g of CO_(2) ?

Answer»

Solution :Enthalpy of COMBUSTION of formaldehyde
`CH_(2)O_((g))+O_(2((g))rarr CO_(2(g))+H_(2)O((g))`
`Delta_(c)H^(@)=-571kJ`
`"Molar of "CO_(2)=("Mass of "CO_(2))/("Molar mass of "CO_(2))`
`=(22)/(44)=(1)/(2)=0.5`
`therefore""` Heat evolved in the formation of 0.5 MOLES of
`CO_(2)=-571xx0.5 =-285.5kJ`
Discussion
16538.

Which of the following realation is correct for zero order reaction?

Answer»

`t_((1)/(2))prop(1)/([R]_(0))`
`t_((1)/(2))prop[R]_(0)`
`t_((1)/(2))prop[R]_(0)`
`t_((1)/(2))` is INDEPENDENT of `[R]_(0)`

Answer :B
Discussion
16539.

When a small amount of KMnO_(4)is added to concentrated H_(2) SO_(4) , a green oily compound is obtained which is highly explosive in nature. Compound may be :

Answer»

`Mn_(2)O_(3)`
`MnSO_(4)`
`Mn_(2)O_(7)`
`MnO_(2)`

Answer :C
Discussion
16540.

Which is metalloid ?

Answer»

Na
Au
As
Fe

Answer :C
Discussion
16541.

What is the osomotic pressure of a "0.0020 mol dm"^(-3) sucrose (C_(12)H_(22)O_(11)) solution at 20^(@)C? (Molar gas constant, R ="8.314 JK"^(-1)"mol"^(-1))

Answer»

4870 Pa
4.87 Pa
0.00487 Pa
0.33 Pa

Solution :`pi-CRT`
`C="0.002 MOL DM"^(-3)="2 mol m"^(-3)`
`R=8.314JK^(-1)"mol"^(-1),T=293K`
`pi=2xx8.314xx293=4872Pa`.
Discussion
16542.

What will be effect of temperature on rate constant ?

Answer»

Solution :RATE constant of a REACTION is nearly DOUBLED with rise in TEMPERATURE by `10^@`.
Discussion
16543.

Which of the following actinoids show oxidation states upto +7 ?

Answer»

Am
Pu
U
Np

Answer :B,d
Discussion
16544.

Which one of the following is an example for Frenkel defect ?

Answer»

`NACL`
`AgCl`
`AgBr`
`AgNO_(3)`

Answer :C
Discussion
16545.

When the quantity of a radioactive substance is ncreased to two times, the number of atoms disintegrated per unit time is :

Answer»

doubled
increased FOUR times
not affected
reduced to HALF.

ANSWER :C
Discussion
16546.

What is Baeyer's reagent? Where it is used?

Answer»

Solution :(i) Cold dilute ALKALINE `KMnO_(4)` is known as Baeyer.s reagent. It is used to OXIDISE ALKENE into diols.
(ii) For example, ethylene can be converted into ethylene glycol and this reaction is used as a test for UNSATURATION.
Discussion
16547.

Which of the following is used as an anti septic

Answer»

Phenol
Chloroform
Benzalamine
Malic anhydride

Solution :Phenol , haloform both ACT as antiseptic, but USAGE to haloform may CAUSE SEVERE SIDE effects.
Discussion
16548.

Which of the following metal gives hydrogen with very dil HNO_(3)

Answer»

AL
MG
AU
sn

ANSWER :B
Discussion
16549.

Under identical conditons which of the following pair will be most easy to separate by diffusion process ?

Answer»

`""^(235) UF_(6) ` and `""^(238) UF_(6)`
`H_(2)` and `D_(2)`
`CO_(2)` and `C_(3) H_(8)`
`O_(2)` and `N_(2)`

Answer :B
Discussion
16550.

What is relation between alpha-D-(+)-glucose and beta-D-(-)-glucose of Fischer structure ?

Answer»

MIRROR IMAGE ISOMERS
CHAIN Isomers
Enantiomers
ANOMERS

Solution :Anomers
Discussion