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13351.

Write the IUPAC name and hybridisation of the complex [Fe(CN)_6]^(3-)

Answer»

SOLUTION :IUPAC NAME: HEXACYANOFERRATE (III) ION
Discussion
13352.

What will be the major organic product of the reaction? Explain. C_(6)H_(5)C_(2)H_(5)overset(Br_(2)(hv))to

Answer»

SOLUTION :
The major product of the bromination of ethyl benzene is
It is a photochemical reaction and proceeds by free radical mechanism. Actually, there are two POSSIBLE free radicals which are initially formed when `Br_(2)` attacks the given substrate.

The free radical (II) is a benzylic free radical and is resonance STABILISED.

The free radical (I) is COMPARATIVELY less stabilised by resonance.

therefore, the major product of bromination is 1-bromophenylethane.
.
Discussion
13353.

Which of the following compounds reacts with Mg and then water to give toluene-

Answer»




ANSWER :A::B::C::D
Discussion
13354.

What kind of the following species is not expand to be a ligand?

Answer»

LINKAGE ISOMERISM
SOLVATE isomerism
ionisation isomerism
coordination isomerism

Solution :solvate or HYDRATE isomerism is PRESENT.
Discussion
13355.

Which of the following will not be soluble in sodium bicarbonate?

Answer»

2,4,6-Trinitrophenol
Benzoic aciid
o-Nitrophenol
Benzenesulphinic acid.

Solution :o-Nitrophenol is less ACIDIC than CARBONIC acid and hence does not DISSOLVE in `Na_(2)CO_(3)` solution.
Discussion
13356.

Which of the following reaction (s) are correctly matched with major product ?

Answer»

`H_(3)C-O-CH_(2)-CH_(3)+PCl_(5)rarrH_(3)C-Cl+Et-Cl`
`CH_(3)COOH+PCl_(5)rarrCH_(3)COCl`
`MeCOMe+PCl_(5)rarrMeCH(Cl)Me`
cyclohexanol +`PCl_(5)RARR`Cyclohexylcholoride

Solution :N//A
Discussion
13357.

Which is a true acid anhydride?

Answer»

CO
NO
`Al_2O_2`
`N_2O_5`

ANSWER :D
Discussion
13358.

Which is maximum basic in the following ?

Answer»

`Na_2O`
CsF
NaF
KF

Answer :A
Discussion
13359.

Which of the following gas phase reactions can occur spontaneously?

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`KR+He^(+) RARR Kr^(+)+He`
`Cl^(-)+F rarr F^(-)+Cl`
`Si^(+)+Cl rarr Si+Cl^(+)`
`Cl^(-)+I rarr I^(-)+Cl`

Answer :A
Discussion
13360.

Which of the following is the best dehydrating agent for 1^(@) alcohols

Answer»

Con `H_(2)SO_(4)`
`CAO`
`Al_(2)O_(3)`
`POCl_(3)`

ANSWER :D
Discussion
13361.

Write the highest oxidation state shown by an element with atomic number

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Solution :ELECTRONIC configuration of element with `Z=23 is [AR]^(18) 3d^3 4s^2` . Therefore, its MAXIMUM oxidation state is +5 DUE to loss of two s-electrons and three d-electrons.
Discussion
13362.

Total number of isomeric ethers chrial carbon atom in the molecular formula C_(5)H_(12)O is :

Answer»

SOLUTION :`C_(2)H_(5)-O-C_(3)H_(7),CH_(3)H_(9),CH_(3)O-underset(("CHIRAL"))underset(CH_(3))(CH)-C_(2)H_(5)`
Discussion
13363.

Upon long standing concetrated HNO_(3)

Answer»

remains colourless, but gives out NO
turns yellow brown due to FORMATION of `NO_(2)`
turns yellow brown due to the formation of `N_(2)O_(4)`
remains colourless, but gives `N_(2)O`

Answer :B
Discussion
13364.

What are essential and non - essential amino acids ? Give two examples of each type.

Answer»

Solution :`ALPHA`-AMINO acids which are needed for health and GROWTH of human beings but are not synthesized by the human body are CALLED ESSENTIAL amino acids. For example , valine , leucine , phenylalanine , etc. On the other hand , `alpha`-amino acids which are needed for healthe and growth of human beings and are synthesized by the human body are called non -essential amino acids. For example , glycine , alanine , aspartic acid, etc.
Discussion
13365.

Which of the following statements is incorrect about the collison theory of chemical reaction ?

Answer»

It CONSIDER reacting molecules or atoms to be hard spheres and ignores their structural features
Number of effective collisions determines the rate of reaction
Collision of atoms or molecules POSSESSING sufficient threshold ENERGY results into the product formation
Molecules should collide with sufficient threshold energy and proper ORIENTATION for the collision to be effective.

Solution :( c ) is INCORRECT because formation of product depends not only on energy but also on proper orientation at the time of collision.
Discussion
13366.

Which of the following is correctly match :- (A) Chloramphinicol to (1) iodine containing Hormone (B) Thyroxine to (2) Chlorine containning antibiotic (C ) Chloroquine to (3)Treatment for malaria (D) Fluorinated compound (4) Potential blood substituted (E) Iodoform to Antiseptic

Answer»

A,B,C
B,C
C,D,E
D,E

Answer :C
Discussion
13367.

Which of the following on thermal decomposition yields a basic as well as acidic oxide?

Answer»

`NH_(4)NO_(3)`
`NaNO_(3)`
`KClO_(3)`
`CaCO_(3)`

Solution :`CaCO_(3)OVERSET("Heat")tounderset("oxide")underset("Basic")(CaO)+underset("oxide")underset("ACIDIC")(CO_(2))`
Discussion
13368.

Which of the following is not a metal carbonyl?

Answer»

`Ni(CO)_4`
`[Co(CN)_6]^(3-)`
`Mn_2(CO)_10`
`Fe(CO)_5`

Answer :B
Discussion
13369.

Which is not an unsaturated acid:

Answer»

OLEIC ACID
LINOLEUM acid
LINOLENIC acid
Myristic acid

ANSWER :D
Discussion
13370.

Which of the following reaction does not take place ?

Answer»




Solution :Ary halides having at least ONE hydrogen in ortho positio undergo nucleophilic substitution with a very strong base LIKE `KNH_(2)` in Liquid ammonia This REACTION proceeds via BENZYNE (aryne) intermediate When aryhalides having no hydrogen ortho to the halogen do not react under the same conditions
.
Discussion
13371.

Which of the following is/are correct for potassium ferrcysnide?

Answer»

it gives a brown precipitate with `Cu^(2+)` IONS
it gives a red precipitate of mixed SALT `Cd^(2+)` ions
If in excess gives a white precipitate with `ZN^(2+)`
It develops a deep red coloured with `Fe^(3+)`

Answer :a,c
Discussion
13372.

Why are compounds of transition metals, generally coloured ?

Answer»

SOLUTION :DUE to d-d TRANSITION of ELECTRONS in d-orbitals.
Discussion
13373.

Which one of the following ores is best concentrated by froth floatation method ?

Answer»

magnetite
Siderite
Galena
Malachite

Answer :C
Discussion
13374.

Which is not a redox change ?

Answer»

`CaCO_3 rarrCaO +CO_2`
`2H_2 +O_2 RARR 2H_2O`
`NA + H_2O rarrNaOH + 1/2H_2`
`MnCl_3 rarr MnCl_2 +1/2 Cl_2`

ANSWER :A
Discussion
13375.

Which of the following is not a periodic property

Answer»

ELECTRONEGATIVITY
ATOMIC volume
Covalent radii
Atomic mass

Answer :D
Discussion
13376.

Which alkyl halide from the following pairs would you expect to react more rapidly by S_(N)2 mechanism? Explain your answer. (i) CH_(3)CH_(2)CH_(2)CH_(2)Br or CH_(3)CH_(2)-underset(Br)underset(|)(C)H-CH_(3) (ii) CH_(3)CH_(2)-underset(Br)underset(|)(C)H-CH_(3) or H_(3)C-underset(CH_(3))underset(|)overset(CH_(3))overset(|)(C)-Br (iii) CH_(3)-underset(CH_(3))underset(|)(C)H-CH_(2)CH_(2)Br or CH_(3)CH_(2)-underset(CH_(3))underset(|)(C)H-CH_(2)Br

Answer»

Solution :(i) `CH_(3)CH_(2)CH_(2)CH_(2)Br` is a `1^(@)` ALKYL halide while `CH_(3)CH_(2)-CHBr-CH_(3)` is a `2^(@)` alkyl halide. Since there will be some steric hindrance `2^(@)` alkyl halides than in `1^(@)` alkyl halides, therefore, `CH_(3)CH_(2)CH_(2)CH_(2)Br` will react faster than `CH_(3)CH_(2)-CHBr-CH_(3)` in `S_(N)2` reaction.
(ii) `CH_(3)CH_(2)-CHBr-CH_(3)` is a `2^(@)` alkyl halie while `(CH_(3))_(3)C-Br` is `3^(@)` alkyl halide. since due to lesser steric hindrance, `2^(@)` alkyl halides react faster than `3^(@)` alkyl halides, therefore, `CH_(3)CH_(2)-CHBr-CH_(3)` will react faster than `(CH_(3))_(3)CBR` in `S_(N)2` reaction.
(iii) `overset(4)(C)H_(3)-underset(underset(I)(C)H_(3))underset(|)overset(3)(C)H-overset(2)(C)H_(2)overset(1)(C)H_(2)Br""overset(4)(C)H_(3)overset(3)(C)H_(2)-underset(underset(II)(C)H_(3))underset(|)overset(2)(C)H-overset(1)(C)H_(2)Br`
Both I and II are `2^(@)` alkyl halides. but in alkyl halide (II), the `CH_(3)` group at `C_(2)` is closer to the Br ATOM while in alkyl hlaide (I), the `CH_(3)` group at `C_(3)` is little away from the Br atom. as a result, alkyl halide (I) will suffer GREATER steric hindrance than alkyl halide (I). therefore, `(CH_(3))_(2)CHCH_(2)Br` will react faster than `CH_(3)CH_(2)CH(CH_(3))CH_(2)Br` in `S_(N)2` reaction.
Discussion
13377.

Water possesses a high dielectric constant, therefore

Answer»

it always contains ions.
it is a universal solvent.
can dissolve COVALENT compounds.
can conduct electricity.

Answer :B
Discussion
13378.

Which elements found in human body :

Answer»

Pb
Fe
Cd
Al

Answer :B
Discussion
13379.

To neutrealize completely 20 mL of 0.1 M aqueous solution of phosphorus (H_(3)PO_(3)), the volume of 0.1 M aqueous KOH required is

Answer»

10 mL
20 mL
40 mL
60 mL

Answer :C
Discussion
13380.

What happens when: (write reactions only) (i) Nitroethane is treated with LiAlH_(4) (ii) Diazonium chloride reacts with phenol in basic medium.

Answer»

Solution :(i) `underset("Nitroethane")(C_(2)H_(5)NO_(2))OVERSET(LiAlH_(4))(to)C_(2)H_(5)NH_(2)+2H_(2)O`
Discussion
13381.

Write IUPAC name of the given compound :

Answer»

SOLUTION :4-Chlorobenzenesulphonic ACID
Discussion
13382.

Write the structures of the following compounds :(i) 1-Iodo-4-methylcyclohexane (ii) 2-(3-Chlorophenyl)but-2-ene and (iii) 3-Bromomethylpropene.

Answer»

Solution :
(iii) `overset(1)(C)H_2=underset(CH_3)underset(|)overset(2)(C)-overset(3)(C)H_2Br`
Discussion
13383.

Which element is most electropositive?

Answer»

SOLUTION :FRANCIUM
Discussion
13384.

Which of the following does not react with PCI_5

Answer»

`CH_3OH`
`CH_3COOH`
`CH_3CHO`
`C_2H_6`

ANSWER :D
Discussion
13385.

Which has D configuration.

Answer»




ANSWER :A
Discussion
13386.

Which of the following is the CORRECT structure of sulphapyridine?

Answer»




ANSWER :B
Discussion
13387.

When compound (A) is oxidised by acidic K_2Cr_2O_7 gave (B). Compound (B) on reduction with LiAlH_4 gave (A). The compound (A) and (B) are respectively

Answer»

`CH_3-COCH_3` and `CH_3-COOH`
`C_2H_5OH` and `CH_3-COCH_3`
`C_2H_5-OH` and `CH_3-COOH`
`CH_3-CHO` and `CH_3 COCH_3`

ANSWER :C
Discussion
13388.

The reagent used in hydroboration oxidation ofalkene is ….

Answer»

DIBORANE
Borax
Sodium borohydride
Boric acid

Solution :Diborane
Discussion
13389.

Which alkaline earth metal does not impart the flame colour ?

Answer»

Sr
Be
Ra
Ca

Answer :B
Discussion
13390.

When 0.5 mole of H, and 0.5 mole of I_2react in a 10-litre evacuated vessel at 450^@C, HI is formed. K_c for H_2 + I_2 iff2HIis 50.(i) Calculate K_p(ii) Calculate moles of I_2which are in excess.

Answer»

SOLUTION :50, 0.11 MOLE
Discussion
13391.

Which sweetening agents are used to prepare sweets for diabetic patients?

Answer»

Solution :Artificial SWEETENING agent used to PREPARE SWEETS for diabetic patients is a saccharin. Some other commonly marketedm sweeteners used are sucrulose, alitame and aspartame, whichare more SWEET than cane sugar.
Discussion
13392.

Which has maximum pH in aqueous solution:

Answer»

NACLO
`NaClO_2`
`NaClO_3`
`NaClO_4`

ANSWER :A
Discussion
13393.

Which of the following alcohols is unable to turn orange colour of chromic acid green ?

Answer»

Primay alcohol
Secondary alcohol
Tertiary alcohol
Allyl alcohol

Answer :C
Discussion
13394.

Which of the following reactions are Claisen condensation?

Answer»

`C_(6)H_(5)-CH =O overset(CH_(3)-overset(O)overset(||)C-OC_(2)H_(5) // OH^(-))to`
`C_(6)H_(5)-CH =O overset(CH_(3)-COOC_(2)H_(5) // OH^(-))to`
`C_(6)H_(5)-CH =O overset(CH_(3)-overset(O)overset(||)C-OC_(6)H_(5) // OH^(-))to`
`C_(6)H_(5)-CH =O overset(OH^(-))to`

SOLUTION :BENZALDEHYDE with carbonyl compound or ester having `alpha`-hydrogen ATOM undergoes Claisen condensation.
Discussion
13395.

Use log 1.8=0.26, k_a of formic acid =1.8xx10^(-4),k_a of acetic acid =1.8xx10^(-5),k_b of ammonia=1.8xx10^(4)k_(a1) of H_2S=10^(-7) and k_(a2) of H_2S=10^(-14), for the following matchings Match the entries of column II for which the equality or inequality given in the column I are satisfied. {:("Column-I","Column-II"),((A)10^(-5)M HCl "solution" gt0.1 M H_2S "solution",(p)alpha_("water")("degree of dissociation of water")),((B)CH_3COOH"solution at pH equal to 4.74"=NH_4OH "solution at pH equal to 9.26",(q)[OH^(-)]),((C )0.1 M CH_3COOH "solution"=1.0 M HCOOH solution,(r)alpha("degree of dissociation of electrolytes")),((D)"0.1 M of a weak acid" HA_1(k_a=10^(-5))"solution" lt "0.01 M of a weak acid" HA_2(k_a=10^(-6))"solution",(s)pH),(,(t)1/[H^(+)]) :}

Answer»


Solution :(A)`10^(-5)` M HCl solution gt 0.1 M `H_2S` solution
`alpha` of HCl is more as compared to `H_2S` but concentration of `H_2S` is high.
So `[H^(+)]` ion form HCl is =`10^(-5)` M and `[H^+]` ion from `H_2S=sqrt(K_1C)=sqrt(10^(-7)xx0.1)=10^(-4) M`.
Hence `[OH^-]` ion for HCl =`10^(-9)` and `[OH^-]` coming from HCl is low hence COMMON ion effect is low.
(B)pH of `CH_3COOH` =4.74 and pOH of `NH_4OH=4.74`
Hence `[H^+]` ion from `CH_3COOH` =4.74 and pOH of `NH_4OH`=4.74.
Hence `[H^+]` ion from `CH_3COOH` and `[OH^-]` ion from `NH_4OH` is same.
(C )`alpha=sqrt((Ka)/C)` : for `CH_3COOH,alpha=sqrt(1.8xx10^(-4))`
for `HCOOH, alpha=sqrt(1.8xx10^(-4))`
So, ANSWER is r.
(D)`[H^+]` ion from weak acid `HA_1=sqrt(C_1Ka_1)=sqrt(0.1xx10^(-5))=10^(-3)`
`[H^+]` ion from weak acid `HA_2=sqrt(C_2Ka_2)=sqrt(0.01xx10^(-6))=10^(-4)`
So, answer is p,Q,s.
Discussion
13396.

Which xenon compound is isostructural with ICl_(4)^(-).

Answer»

Solution :`ICl_(4)^(-)` has 4 bond paris and 2 lone PAIRS. Similarly, `XeF_(4)` has 4 bond pairs and 2 lone pairs. Therefore, ACCORDING to VSEPR theory, both are square PLANAR.
Discussion
13397.

What is the difference between inner and outer orbital complexes?

Answer»

Solution :Inner sphere complex: When d-orbital of inner SHELL TAKE PART in HYBRIDISATION.
Outer sphere complex: When d-orbital of OUTERMOST shell take part in hybridisation.
Discussion
13398.

What is denatured alcohol ?

Answer»

Solution :The process of MIXING of PYRIDINE or copper sulphate to the alcohol is KNOWN as alcohol DENATURATION and the alcohol with pyridine or copper sulphate is known as DENATURED alcohol. The denatured alcohol is unfit for drinking.
Discussion
13399.

What is the coordination number of the metal ion in the red complex ion formed in a quanlitative analysis test of iron(III)?

Answer»


Solution :Complex ion is `[FE(H_2O)SCN]^(2+)` , It has COORDINATION number six
Discussion
13400.

Threemoles of theidealgas areexpandedisothermallyfrom avolumeof 300 cm^(3) to2.5L at300 Kagainsta pressureof1.9 atm. Calculatethe workdonein L andand joules.

Answer»


Solution :Numberof molesof a gas= n=3 mol
Initialvolume`=V_(1) = 300 cm^(3)= 0.3 L(or dm^(3))`
Finalvolume`= V_(2) = 2.5 L`
Externalpressure `= P_(EX)= 1.9atm `
Temperature= T = 300 K
Since theexpansiontakesplaceagainstconstantpressureit isirreversible PROCESS and workis givenby
`W=- P_("ex") (V_(2)-V_(1))`
=- 1.9 (2.5 -0.3)
`=- 4.18 L atm `
Now , 1 L atm= 101 . 3 J
`:. W= - 4.18 xx101 .3 =- 423 .4 J`
Discussion