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17451.

Write IUPAC name of the monomer of natural rubber.

Answer»

SOLUTION :IUPAC name of MONOMER of natural rubber 3-Methyl buta-1,3-diene
`overset(4)(CH_2) = overset(CH_3)overset(|3)C-overset(2)(CH) = overset(1)C H_2`
Discussion
17452.

Which of the following molecule is chiral.

Answer»




ANSWER :D
Discussion
17453.

Which of the following is most effective electrolyte in the coagulation of Fe_2O_3. H_2O //Fe^(3+) sol ? KCl, AlCl_3, MgCl_2, K_4[Fe(CN)_6]

Answer»

Solution :`K_4[Fe(CN)_6]` is the most EFFECTIVE ELECTROLYTE because it GIVES `[Fe(CN)_6]^(+)` IONS which have the maximum negative charge.
Discussion
17454.

Total secondary amine compounds possible (benzene derivations) for C_(8)H_(11)N

Answer»


SOLUTION :
Discussion
17455.

Which one of the following compounds is not a vitamin:

Answer»

ASCORBIC acid
Thiamine
TESTOSTERONE
Riboflavin

Answer :C
Discussion
17456.

Which compound cannot be prepared ?

Answer»

`Zn(OH)_2`
`CD(OH)_2`
`HG(OH)_2`
`HgCL_2`

Answer :C
Discussion
17457.

What is the order with respect to each of the reactant and overall order of the following reactions ? (a) 5Br_((aq))^(-)+BrO_(3(aq))^(-)+6H_((aq))^(+)rarr3Br_(2_((l)))+3H_2O_((I)) The experimental rate law is Rate =k[Br^(-)][BrO_3^-][H^+]^2 (b) CH_3CHO_((g))overset(Delta)rarrCH_(4(g))+CO_((g)) the experimental rate law is Rate =k[CH_3CHO]^(3//2)

Answer»

Solution :(a) First ORDER with RESPECT to `Br^-` , first order with respect to `BrO_3^-` and SECOND order with respect to `H^+` . Hence the overall order of the reaction is equal to
(b) Order of the reaction with respect to ACETALDEHYDE is `3/2` and overall order is ALSO `3/2` .
Discussion
17458.

What is the correct order of reactivity of alcohols in the following reaction? R-OH +HCl overset(ZnCl_(2))to R-Cl+H_(2)O

Answer»

`1^(@) gt 2^(@) gt 3^(@)`
`1^(@) lt 2^(@) gt 3^(@)`
`3^(@) gt 2^(@) gt 1^(@)`
`3^(@) gt 1^(@) gt 2^(@)`

ANSWER :C
Discussion
17459.

When an oxide of Mn (B). Compound (B) disproportionate in neutral or acidic solution to give purple compound

Answer»

Solution :`B : K_(2) MnO_(4)`
Discussion
17460.

Which of the following statements is truw about saturated solution?

Answer»

A SOLUTION in which no more SOLUTE can be DISSOLVED at the same temperature and pressure
The solution which is in dyanmic equilibrium with UNDISSOLVED solute and contains maximum amount of solute dissolved in solvent
The solution in which more solute can be dissolved
Both (a) and (b)

Solution :N//a
Discussion
17461.

Which reagent gives purple colouration with phenol?

Answer»

ANHYDROUS `AlCl_3`
Anhydrous `ZnCl_2`
NEUTRAL `FeCl_3`
`HCL + ZnCl_2`

SOLUTION :Neutral `FeCl_3`
Discussion
17462.

When CS_(2) Layer containingboth Br_(2) and I_(2) is shakenwith excess of CI_(2) water the violetcolour due to I_(2) disappearance of violetcolour and appereance of paleyellow colour is due to the formationof

Answer»

`I_(3)^(Θ)` and `Br_(2)` RESPECTIVELY
`HIO_(3)` and `BrCI` respectively
`KI` and `BrCI` respectively
`I^(Θ)` and `Br^(Θ)`, respectively

ANSWER :b
Discussion
17463.

The value of K_p is 1 xx 10^(-3)atm^(-1) at 25^@C for the reaction 2NOCI+CI_2 hArr 2NOCI. A flask contains NO at 0.02 atm and 25^@C . Calculate the moles of CI_2 that must be added if 1% of NO is to be converted to NOCI at equilibrium . The volume of the flask is such that 0.2 moles of the gas produce 1atm pressure at 25^@C (ignore the probable association of NO to N_2O_2)

Answer»


ANSWER :0.16 ATM
Discussion
17464.

The reduction potential to calomel decreases with

Answer»

DECREASE in CONCENTRATION of KCl
increase in concentration of KCl
no effect of concentration of KCl
atmospheric pressure

Solution :Dissociation of KCl INCREASES with DILUTION.
Discussion
17465.

What is salt bridge? How is it represented in a cell diagram?

Answer»

Solution :(i) In the complete CELL DIAGRAM, the two half cells are separated by a double vertical line (salt BRIDGE) in between.
(II) The zinc-copper cell can now be written as
`UNDERSET("ANODE HALF-CELL")(Znabs(Zn^(2+)""))underset("CATHODE HALF-CELL")(abs(""Cu^(2+)"")""Cu)`
Discussion
17466.

Which of the following is the strongest base in aqueous solution

Answer»

`(CH_(3))_(3)N`
`(CH_(3))NCH_(2)CH_(2)OH`
`CH_(3)CH_(2)CH_(2)NHOH`
`(CH_(3))_(4)NOH`

Solution :RELEASE `OH^(-)` IONS
Discussion
17467.

Which one of the following is wrongly matched?

Answer»

Saponification of `CH_(3COOC_(2)H_(5)` - second order reaction
Hydrolysis of `CH_(3)COOCH_(3)` - PSEUDOUNIMOLECULAR reaction
DECOMPOSITION of `H_(2)O_(2)` - First order reaction
Combination of `H_(2)` and `Br_(2)` to give HBr - Zero order reaction

Answer :D
Discussion
17468.

Which of the following statements are incorrect about penicillin ?

Answer»

An antibacterial fungus
Ampicillin is its synthetic modification
It has bacteriostatic effect
It is a BROAD SPECTRUM antibiotic

Solution :PENICILLIN is BACTERIA fungi and narrow spectrum antibiotic.
Discussion
17469.

Which polymer is used to prepare plastic crockery ?

Answer»

MELAMINE
BAKELITE
(A) and (B) both
Neoprene

SOLUTION :Melamine
Discussion
17470.

When two equal sizedpieces of thesame mental at different temperature T_(h) (hot piece) and T_(c)(cold piece ) are brought intothremal constant and isolated from it's surrounding. The totalcharge in entropy of system is given by

Answer»


SOLUTION :`C_(v) (T_(h)- T) =C_(v)(T -T_(v)) rArr""T=(T_(c) + T_(h))/(2) "",""because DeltaS=underset(T_(1))overset(T_(2))int (C_(v).dt)/(T)``DeltaS_(c) = C_(v) LN .(T)/(T_(c)) &DeltaS_(h) = C_(v) ln. (T)/(T_(h))`
Total `DeltaS = C_(v)ln.((T_(c) + T_(h))/(2T_(c))) + C_(v)ln .((T_(c) + T_(h))/(2T_(h)))= C_(v)ln.((T_(c) + T_(h))^(2))/(4T_(c).T_(h))`
Discussion
17471.

Which characterstics of zero group elements is common

Answer»

Each of them has the same atomic NUMBER
Each of them has the same atomic mass
The OUTERMOST ORBIT of each is saturated in electrons
Each of them has the same number of electrons

Answer :C
Discussion
17472.

Which of the following is least reactive towards nucleophilic substitution with aqueous KOH?

Answer»




ANSWER :B
Discussion
17473.

Which of the following will give blood red colour with FeCl_(3) in sodium extract ?

Answer»


`H_(2)N-OVERSET(S)overset(||)C-NH_(2)`
`CH_(3)-overset(O)overset(||)C-NH_(2)`
`H_(2)N-overset(O)overset(||)C-NH_(2)`

SOLUTION :If Both nitrogen and sulpher are present in an organic compound, sodium FUSION will convert into sodium THIOCYANATE which than react with `Fe^(+3)` to farm blood red COLOUR complete `[Fe(SCN)]^(+2)`
Discussion
17474.

Write the structure of an isomer of compound C_(4)H_(9)Br which is most reactive towards S_(N)1 reaction.

Answer»

Solution :`3^(@)` Alkyl halides are most REACTIVE towards `S_(N)1` REACTION. Now a `3^(@)` alkyl BROMIDE having `MF" "C_(4)H_(9)Br` is 2-bromo-2-methylpropane, i.e.,
`UNDERSET("2-Bromo-2-methylpropane "(3^(@)))(CH_(3)-underset(Br)underset(|)overset(CH_(3))overset(|)(.^(3^(@))C)-Br)`
`therefore`2-Bromo-2-methylpropane is most reactive towards `S_(N)1` reactions.
Discussion
17475.

Which of the following pair of elements are called chemical twins ?

Answer»

ZR and Hf
No and TA
MO and W
all of these

ANSWER :D
Discussion
17476.

Thecell, Zn|Zn^(2+)(1M)||Cu^(2+)(1M) |Cu (E_("cell")^(@)=1.10V) was allowed to be completely discharged at 298 K. Therelative concentration of Zn^(2+) to Cu^(2+)(([Zn^(2+)])/([Cu^(2+)])) is

Answer»

`9.65 xx10^(4)`
antilog `(24.08)`
`37.3`
`10^(37.3)`

SOLUTION :`E_(CELL)=0,` when cell is completely discharged.
`E_(cell) =E_(cell)^(@)-(0.059)/(2) log ""([(ZN^(2+))/(Cu^(2+))])/([Cu^(2+)])`
or `0=1.1-(0.059)/(2)log ""(([Zn ^(2+)])/([Cu^(2+)]))`
`log ""(([Zn^(2+)])/([Cu^(2+)]))=(2xx 1.1)/(0.059)=37.3`
`therefore (([Zn^(2+)])/([Cu^(2+)]))=10^(37.3)`
Discussion
17477.

The smallest units in living organism is

Answer»

Organelle
Tissue
Organ
Biomolecule

Answer :D
Discussion
17478.

When benzoic acid is heated with soda lime, benzene is formed.

Answer»


ANSWER :1
Discussion
17479.

Which of the following pyroacid has X-X bond

Answer»

<P>`H_(2)S_(2)O_(7)`
`H_(2)S_(2)O_(5)`
`H_(4)P_(2)O_(5)`
`H_(4)P_(2)O_(6)`

SOLUTION :(i) `H-O-underset(OH)underset(|)overset(O)overset(||)S-O-underset(OH)underset(|)overset(O)overset(||)S-O-H`
(II) `HO-underset(O)underset(||)overset(O)overset(||)S-overset(O)overset(||)S-OH`
(iii) `H-O-overset(O)overset(||)P-O-overset(O)overset(||)P-OH`
(iv) `H_(4)P_(2)O_(6): HO-underset(OH)underset(|)overset(O)overset(||)P-underset(OH)underset(|)overset(O)overset(||)P-OH`
Discussion
17480.

Which of the following is not metamer ?

Answer»

`C_(2)H_(5)OC_(2)H_(5)`
`CH_(3)O(CH_(2))_(2)CH_(3)`
`CH_(3)OCH(CH_(3))_(2)`
`CH_(3)OC(CH_(3))_(3)`

ANSWER :D
Discussion
17481.

Write structures of the following compounds : (i) 2-Chloro -3- methylpentane(ii) 1-Chloro -4- ethylcyclohexane (iii) 4- Tert.Butyl-3-iodoheptane(iv) 1, 4-Dibromobut -2- ene (v) 1-Bromo -4-sec. butyl -2-methylbenzene

Answer»

Solution :Structures of the GIVEN compounds are given below :
(i) `overset(1)CH_(3) - underset(Cl)underset(|)overset(2)CH - underset(CH_(3))underset(|)overset(3)(CH) - overset(4)CH_(2)overset(5)CH_(3)`
2-Chloro -3- methylpentane
(ii)
(iii)
(iv) `Broverset(1)CH_(2) - underset("1, 4-Dibromobut -2-ene ")(overset(2)CH = overset(3)CH- overset(4)CH_(2)Br)`
(v)
Discussion
17482.

Write the catalyst used in the decomposition of potassium chlorate to get potassium chloride and oxygen.

Answer»

SOLUTION :MANGANESE DIOXIDE of `MnO_2`.
Discussion
17483.

What type of solutions are formed on dissolving different concentration of soap in water?

Answer»

SOLUTION :Soap at a lower concentration behaves as ELECTROLYTE. HOWEVER, if the concentration exceeds critical micelle concentration, the soap MOLECULES aggregates to FORM a micelle that behaves like a colloid.
Discussion
17484.

Which of the following does not form negatively charged sol ?

Answer»

`Sb_2S_3`
Cu METAL
CONGO red
METHYLENE blue

Solution :Methylene blue
Discussion
17485.

which of the following dissolves in water to give a neutral solution

Answer»

`(NH_(4))_(2)SO_(4)`
`BA(NO_(3))_(2)`
`CrCl_(3)`
`CuSO_(4)`

SOLUTION :`Ba(NO_(3))_(2)` does not undergo HYDROLYSIS.
Discussion
17486.

Which of the following statement(s) is/are correct

Answer»

Transition element exhibit higher enthalpies of atomization as they have STRONGER interatomic interaction
`IE_(2)` of `._(23)Vlt._(24)Crgt_(25)Mn` & `._(28)Nilt_(29)Cugt_(30)Zn`
Ni(III) compounds are more stable than `Pt(IV)`
The ELEMENTS which give the greatest number of OXIDATION states do not OCCUR in or near the middle of the series.

Solution :N//A
Discussion
17487.

When an ion leaves its correct lattice site and occupies interstitial sites in its crystal lattice, it is called:

Answer»

CRYSTAL defect
Frenkel defect
SCHOTTKY defect
None of these

Answer :B
Discussion
17488.

Which of the following give linear plots

Answer»

<P>`"LOG" x/m "VERSUS log" C`
`"log" x/m "versus" 1/p`
`m/x "versus" 1/p`
`p//(x/m) "versus" P`

SOLUTION :`x/m =K.P^(1/n)`
Discussion
17489.

What are natural and synthetic polimers? Give two examples of each type.

Answer»

Solution : Natural polymers: Polymers which are FOUND in nature, i.e., in animal and plants are called natural polymers. For EXAMPLE, proteins, STARCH, CELLULOSE etc.
Synthetic polymers: Man - made polymers are called synthetic polymers. For example plastics, synthetic FIBRES.
Discussion
17490.

What is the most common type of reactions of aromatic compounds ?

Answer»

ADDITION REACTION
ELIMINATION reaction
electrophillic SUBSTITUTION reaction
rearrangement

Answer :C
Discussion
17491.

Which will not go for diazotisation

Answer»

`C_(6)H_(5)NH_(2)`
`C_(6)H_(5)CH_(2)NH_(2)`

Solution :Diazotisation [action of nitrous acid `(NaNO_(2)+HCL)`] is given by an aromatic primary AMINE (having- `NH_(2)` group directily attached to nucleus), in an inorganic acid leading to the formation of diazonium SALT. In option (b) `-NH_(2)` is not LINKED directly to the BENZENE nucleus hence will not go for diazotisation.
Discussion
17492.

Two test tubes containing a nitrate and a bromide are treated separately with conc, H_(2)SO_(4) brown fumes evolved are passed in water. The water will be coloured by vapours evolved from the test tube containing

Answer»

Nitrate
Bromide
Both (1) and (2)
NONE of these

Answer :B
Discussion
17493.

Which of the following is satisfied by an ideal solution ?

Answer»

Formation of an azeetropic MIXTURE
`DeltaS_(mix)= 0`
Raoutl's law is OBEYED under particlar SET of CONDITIONS only
`DeltaH_(mix) = 0`

Answer :D
Discussion
17494.

What is the oxidation state of the central atom in [Fe(EDTA)) complex ion.

Answer»

SOLUTION :`3`
`X + 1x x (-4)= -1`
THEREFOUR`x=3`
Discussion
17495.

What are the limitations of valemce bond theory?

Answer»

Solution :(1) It does not explain the MAGNETIC properties of the COORDINATION compounds in detail.
(2) It does not explain thermodynamic STABILITY of complexes.
(3) It does not explain colours or spectroscopical properties of complexes.
(4) It does not help to predict the strength of the ligands (WEAK or strong).
Discussion
17496.

Which of the following compound doesn't hydrolyse by S_(N)1 mechanism ?

Answer»

`CH_(2)=CHCH_(2)Cl`
`C_(6)H_(5)Cl`
`C_(6)H_(5)CH_(2)Cl`
`C_(6)H_(5)CH(CH_(3))Cl`

ANSWER :B
Discussion
17497.

When the vapours of tertiary butyl alcohol are passed through heated copper at 573 K, the product formed is

Answer»

but - 2 - ENE
2 - butanonone
2 - methyl propene
BUTANAL

Solution :`underset(("TEST . alcohol"))underset("2 - methyl propan-2-ol")underset(CH_3)underset(|)OVERSET(CH_3)overset(|)(CH_3-C-OH)overset(cu//573K)underset(-H_2O)rarrunderset("2-methypropene")underset(CH_3)underset(|)(CH_3-C-CH_2)`
Discussion
17498.

What is Chloropicrin? How is it prepared? Give its uses.

Answer»

Solution :`"CC"l_(3)NO_(2)` is Chloropicirin. It is prepared from nitro methane with `Cl_(2)` in the presence of NaOH. The `alpha`- H atom of nitroalkanes are SUCCESSIVELY replaced by HALOGEN atoms.
`CH_(3)NO_(2)+3Cl_(2)overset(NaOH)(to) UNDERSET("Chloropierin")("CC"l_(3)NO_(2))+3HCL`
It is used as an insecticide.
Discussion
17499.

When fruits and vegetables that have been dried are placed in water, they swell in size and regain their original form why ? Would a temperature increse accelerate this process ?

Answer»

SOLUTION :DUE to OSMOSIS which incrases with RISE in TEMPRETURE
Discussion
17500.

Which explains the effect of a catalyst on the rate of a reversible reaction ?

Answer»

It PROVIDES a new REACTION pathway with a lower activation energy
It moves the equilibrium POSITION to the right
It increases the kinetic energy of the reacting molecules
It decreases the RATE of the reverse reaction

Answer :A
Discussion