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17051.

Which of the following compounds is not chiral?

Answer»

1-Chloro-2-methylpentane
2-Chloropentane
1-Chloropentane
3-Chloro-2-methylpentane

Solution :(A) `ClCH_(2)underset(CH_(3))underset(|)overset(**)(CH)CH_(2)CH_(2)CH_(3)` (B) `CH_(3)underset(CL)underset(|)overset(**)(C)HCH_(2)CH_(2)CH_(3)`
(C ) `ClCH_(2)CH_(2)CH_(2)CH_(2)CH_(3)`
(D) `CH_(3)-underset(CH_(3))underset(|)(CH)-underset(Cl)underset(|)overset(**)(C)HCH_(2)CH_(3)` (C ) is not chiral
Discussion
17052.

Which has aromatic ring in complex ?

Answer»

DMG in dimethylglyoximate
Cyclopentadienyl ANION in ferrocene
Both (a) and (B)
NONE of these

Solution :
Discussion
17053.

Which of the following have same units:(i) Work, (ii) Heat, (iii) Energy (iv) Entropy

Answer»

(i), (II) and (III)
(i), (ii) and (IV)
(ii), (iii) and (iv)
(iii) and (iv)

ANSWER :A
Discussion
17054.

Which of the following amines is the strongest base ?

Answer»




SOLUTION :E.D.G `UARR` b.c `uarr`
Discussion
17055.

Which of the following is not a reducing sugar?

Answer»

Glucose
Sucrose
LACTOSE
MALTOSE

ANSWER :B
Discussion
17056.

Yellow colouredsolution of FeCI_(3) changes in lightgreenwhen

Answer»

`SnCI_(2)` is ADDED
`Zn`is added
`H_(2)S` GAS is added
All true

Answer :d
Discussion
17057.

What will be the normality of a solution obtained by mixing 0.45 N and 0.60 N NaOHin the ratio 2:1 by volume :

Answer»

0.4 N
0.5 N
1.05 N
0.15 N

Answer :B
Discussion
17058.

Which one of the following statements regarding helium is incorrect

Answer»

It is used to produce and sustain powerful superconducting magnets
It is used as a cryogenic agent for carrying out experiments at low temperature
It is used to fill gas balloons insteadof HYDROGEN because it is LIGHTER and non-inflammable
It is used in gas-cooled nuclear REACTORS

Solution :Helium is twice as heavy as hydrogen , its lifting power is 92% of that of hydrogen. Helium has the lowest MELTING and boiling point of any element which makes LIQUID helium an ideal coolant for many extremely low temperature application such as super conducting magnet and cryogenic research where temperature close to absolute zero are needed.
Discussion
17059.

Write IUPAC names of the following compounds : ((i) CH_(3)-underset(CH_(3))underset("|")"CH"-underset(OH)underset("|")"CH"-overset(CH_(3))overset("|")underset(CH_(3))underset("|")"C "-CH_(3) (ii) CH_(3)-underset(OH)underset("|")"CH"-CH_(2)-underset(OH)underset("|")"CH"-underset(C_(2)H_(5))underset("|")"CH"-CH_(2)CH_(3) (iii) CH_(3)-underset(OH)underset("|")"CH"-underset(OH)underset("|")"CH"-CH_(3) (iv) HO-CH_(2)-underset(OH)underset("|")"CH"-CH_(2)-OH (ix) CH_(3)-O-CH_(2)-underset(CH_(3))underset("|")"CH"-CH_(3) (x) C_(6)H_(5)-O-C_(2)H_(5) (xi) C_(6)H_(5)-O-C_(7)H_(15)(n-) (xii) CH_(3)-CH_(2)-O-underset(CH_(3))underset("|")"CH"-CH_(2)-CH_(3)

Answer»

SOLUTION :`{:("(i) 2, 2, 4 - Trimethylpentan -3- ol","(ii) 5 - Ethylheptane -2, 4 - diol"),("(iii) Butane-2, 3 - diol","(iv) Propane -1, 2, 3 - triol"),("(V) 2 - Methylphenol","(vi) 4-Methylphenol"),("(vii) 2, 5 - Dimethylphenol","(viii) 2, 6 - Dimethylphenol"),("(ix) 1-Methoxy-2-methylpropane","(x) ETHOXYBENZENE"),("(xi) 1-Phenoxyheptane","(xii) 2-Ethoxybutane"):}`
Discussion
17060.

Which of the following ligand is not pi-acceptor ligand ?

Answer»

`pi-C_(3)H_(5)^(-)`
`pi-C_(5)H_(5)^(-)`

`PF_(3)`

Solution : does not have vacant orbital to accept ELECTRON from central metal ATOM.
Discussion
17061.

Which is a reversible reaction:

Answer»

`H_2+I_2rarr2HI`
`H_2SO_4 + BA(OH)_2 RARR BaSO_4 + 2H_2O`
`Nacl+AgNO_3 rarr NaNO_3 + Agcldownarrow`
`2KClO_3rarr2KCl +3O_2downarrow`

ANSWER :A
Discussion
17062.

Which one of the following molecule is not trigonal pyramidal ?

Answer»

`NF_(3)`
`NCl_(3)`
`PH_(3)`
`BF_(3)`

Answer :D
Discussion
17063.

Which of the following pairs are diastereomers?

Answer»

`{:(""CHO""CHO),("||"),(H-C-OH and HO-C-H""),("||"),(""CH_(3)""CH_(3)):}`


All of these

Answer :C
Discussion
17064.

The volume occupied by 8.8 g of CO_(2) at 31.1^(@)C and 1 bar pressure ( in L ) is

Answer»

<P>

SOLUTION :No of MOLE of `CO_(2) = (8.8)/(44) = 0.2` mole, `T=304.1K , P =1` bar
`V= (nRT)/(P) = (0.2 xx 0.083 xx 304.1)/(1) = 5L`
Discussion
17065.

Westrosol is :

Answer»

ACETYLENE tetrachloride
Acetylene dichloride
Trichloroethyene
1,1,2- Trichloroethene

Answer :D
Discussion
17066.

Write IUPAC names of the following compounds:

Answer»

SOLUTION :The IUPAC NAMES are: (1) 3-Bromo-2-methylbut-1-ene and (II) 4-Bromopent-2-ene
Discussion
17067.

Waterwill boil at 101.5^@C at which of the XT- following pressure:

Answer»

76 m of Hg
76 MM of Hg
>76 cm of Hg
<76 cm of Hg

Answer :C
Discussion
17068.

Write the equation of the reaction of hydrogen iodide with (i) 1-propoxypropane (ii) methoxybenzene (iii) benzyl ethyl ether.

Answer»

SOLUTION :
Discussion
17069.

Which of the following alcohols has the lowest solubility in water ?

Answer»

METHANOL
ETHANOL
1-Propanol
1-Butanol

Answer :C
Discussion
17070.

Write the monomers and chemical equation for the preparation of Buna - S rubber.

Answer»

Solution :`UNDERSET("Buta -1,3 - diene")(nCH_(2)=CH-CH=CH_(2))+nCH_(2)=underset("Styrene")underset(C_(6)H_(5))underset("|")"CH"rarr(-CH_(2)-CH=CH-CH_(2)-underset("Buna-S")underset(C_(6)H_(5))underset("|")"CH"-CH_(2)-)_(N)`
Discussion
17071.

Which solution will show the maximum vapour pressure at 300 K ?

Answer»

1 M NaCl
1 M `CaCl_2`
1 M `CH_3COOH`
1 M `C_12H_22O_11`

ANSWER :D
Discussion
17072.

When H_2 S is passed through acidified KMnO_4, we get

Answer»

`K_(2)SO_(3)`
`MnO_(2)`
`KHSO_(3)`
SULPHUR

Solution :`2KMnO_(4) +3H_(2)SO_(4) +5H_2S to K_(2)SO_(4) + 2MnSO_(4) +8H_(2)O + 5S`
Discussion
17073.

The volumes of 1M HCl and 5M HCl to be mixed to get 2 lit of 2M HCl are

Answer»

1 LIT and 1 lit
1.5 lit and 0.5 lit
1.25 lit and 0.75 lit
`1.33 lit and 0.66 lit

Answer :B
Discussion
17074.

Which graph of the following represents the graph between log p (on Y - axis) and 1/T (on X - axis)?

Answer»




ANSWER :B
Discussion
17075.

Which of the following will not undergo Hoffmann Bromanide reaction?

Answer»




All

Answer :D
Discussion
17076.

What is the product treated with Br_2 water?

Answer»




SOLUTION :
Discussion
17077.

Treatment of n-propylamine with nitrous acid gives

Answer»

`CH_(3)CH=CH_(2)`
`CH_(3)-CH_(2)-CH_(2)OH`
`H_(3)C-underset(OH)underset(|)(C)H-CH_(3)`
NONE of these

Answer :A::B::C
Discussion
17078.

underset((ii) Zn-H_(2)O) overset((i) O_(3))to underset(Delta) overset(bar:OH)to NO. of aldol condensation product.

Answer»


SOLUTION : `underset(Delta)OVERSET(BAR( : )OH)to` No aldol condensation
Discussion
17079.

Which will have a higher boiling point ? 1-chloroethane or 2-methyl-2-chlorobutane Give reasons:

Answer»

SOLUTION :1-chloroethane being straight CHAIN compound has a higher boiling point. It has a larger ACE area and larger van der WAALS. FORCES of attraction between the molecules.
Discussion
17080.

Which configuration represents a noble gas:

Answer»

`1s^2,2s^2,2p^6,3s^2`
`1s^2, 2s^2,2p^6, 3s^5`
`1s^2, 2s^2,2p^6,3s^2,3p^6`
`1S^2, 2S^2,2p^6, 3S^2,3p^6,3d^10, 4s^2`

ANSWER :C
Discussion
17081.

The treatment of alkyl chloride with aqueous KOH leads to formation of alcohols but in the presence of alcoholic KOH, alkenes are major products. Explain.

Answer»

Solution :In aqueous KOH, KOH is ALMOST completely ionised to give a large concentration of strong nucleophile, `OH^(-)` which brings about SUBSTITUTION to give alcohols. Further in the aqueous solution, `OH^(-)` ions are HIGHLY hydrated which decreases the basic character of `OH^(-)` ions and they can.t extract H-atoms from `beta`-C- atom of alkyl halide and can.t bring about elimination to the alkene.
In the alcoholic solution of KOH there are ALKOXIDE ions (`RO^(-)`) which being much stronger base than `OH^(-)` ions can bring about elimination to give an alkene. In alcoholic KOH solution, there is a low concentration of `OH^(-)`ions and substitution does not OCCUR.
Discussion
17082.

Which cell has a constant voltage thorughout its life ?

Answer»

Leclanche cell
Electrolytic cell
MERCURY cell
DANIEL cell.

SOLUTION :Mercury cell has a constant VOLTAGE through out its life .
Discussion
17083.

What is the role of limestone in the extraction of iron from its oxides?

Answer»

Solution :Role of limestone is the EXTRACTION of iron from its oxidef is to remove the impurity of SILICA as a slag of CALCIUM silicate.
`{:(CAO+ SiO_(2) to CaSiO_(3)),("Slag "):}`.
Discussion
17084.

Which of the following has highest melting and boiling points?

Answer»

Cs
Be
Li
Ba

Answer :B
Discussion
17085.

Write IUPAC name of the following compound : ""CH_(3)NHCH(CH_(3))_(2)

Answer»


Answer :`CH_(3)-underset(underset(H)(|))(N)-underset(underset(CH_(3))(|))OVERSET(1)(CH)-overset(2)(CH_(3))`
N-Methylpropan-2-amine
Discussion
17086.

Which of the following is the correct order of Lewis basic strength ?

Answer»

`NF_(3) GT NCl_(3) gt NBr_(3) gt Nl_(3)`
`NF_(3) gt Nl_(3) gt NCl_(3) gt NBr_(3)`
`NI_(3) gt NBr_(3) gt NCl_(3) gt NF_(3)`
`NI_(3) gt NCl_(3) gt NBr_(3) gt NF_(3)`

ANSWER :C
Discussion
17087.

Which of the following has least hydrogen bonding ?

Answer»

Phenol
Liquid `NH_(3)`
Liquid HCl
Liquid HF

ANSWER :C
Discussion
17088.

The same quantity of electricity is passed through 0.1M H_2SO_4 and 0.1 M HCl. The amounts of H_2obtained at the cathodes are in the ratio

Answer»

`1:1`
`2:1`
`1:2`
`3:1`

ANSWER :A
Discussion
17089.

Write the hybridisation type and magnetic behaviour of the complex [Ni(CN)_(4)]^(2-). [Atomic number of Ni = 28]

Answer»

Solution : `to` Under the influence of ligands
`DSP^(2)` hybridisation
Hybridisation involved : `dsp^(2)`. This hybridisation GIVES square plannar shape.
Magnetic behaviour : Diamagnetic as there are no UNPAIRED electrons
Discussion
17090.

What is Freundlich adsorption isotherm ?

Answer»

SOLUTION :A PLOT of `LOG""(x)/(m)`VERSUS log p.
Discussion
17091.

Which of the following pair are not related as metamer:-

Answer»




SOLUTION :`N//A`
Discussion
17092.

Which of the following reaction(s) don't/doesn't produce alcohol?

Answer»

`CH_(3)-COOH underset(HI.DELTA)overset("red P")to `
`CH_(3)-NH-CH_(2)- CHOunderset(H^(+))overset(CH_(3)MgBr)to`

`CH_(3)-underset(CH_(3))underset(|)CH- NH_(2) overset(NaNO_(2),HCl)to`

SOLUTION :`CH_(3)COOH underset("HI" Delta)overset("Red P")to CH_(3)CH_(3)`
`CH_(3)-underset(H)underset(|)N- CH_(2)overset(O)overset(||)CH overset(CH_(3)MgBr)to CH_(3)-underset(MgBr)underset(|)N-CH_(2)-overset(O)overset(||)CH+CH_(4)`
Discussion
17093.

Which of the following statement regarding halogens is/are correct?

Answer»

IONIZATION ENERGY decreases with INCREASE in atomic number
electronegativity decreases with increase in atomic number
Electron AFFINITY decreases with increase in atomic number
Enthalpy of FUSION increses with increase in atomic number

Answer :A::B::D
Discussion
17094.

Using valence bond theory (VBT), account for the geometry, type of hybridization and magnetic property of [NiCl_(4)]^(2-).

Answer»

Solution :The oxidation state of nickel inP `[NiCl_(4)]^(2+)` is+2. The outer electronic configuration of nickel(+2) is `3d^(8)4S^(0)`-

When weak ligand, Cl“ is approaching towards central METAL ION, one 4s and three 4p orbitals hybridised to yield four `sp_(3)` hybrid orbitals pointing towards the four comers of tetrahedron
Each Cl- ion donates a pair of ELECTRONS to four `sp_(3)` hybrid orbitals to form tetrahedral complex. Due to the presence of two of unpaired electrons, the compound is PARAMAGNETIC in nature.
Conclusions:- 1/Hybridisation- `Sp_(3)`
2. Geometrical shape – tetrahedral
3. Magnetic property - Paramagnetic.
Discussion
17095.

Which one of the followingis a polysaccharide ?

Answer»

NYLON
Amylose
Ribose
Polyethene

ANSWER :B
Discussion
17096.

Which alkyl halide is preferntially hydrolised by SN^1 mechanism :

Answer»

`CH_3Cl`
`CH_3CH_2Cl`
`CH_3CH_2CH_2Cl`
`(CH_3)_3C CDOT CL`

ANSWER :D
Discussion
17097.

The total number of alpha and betaparticles lost in the process of transformation of: ""_(92)^(238)U to ""_(82)^(206)Pb is :

Answer»

6
8
10
14

Answer :B
Discussion
17098.

Which is not true about metal carbonyls?

Answer»

<P>Here CO acts as a LEWIS base as well Lewis acid
here metal acts as lewis base as well as lewis acid
here `d pi- p pi` back bonding takes place
Here `p pi-p pi` ack bonding takes place

Solution :CO is called `pi`-acid ligand. In metal carbonyl complexes, there is donation of an element pair from CARBON to the EMPTY orbital of metal and thee simultaneously a back `pi`-bonding is formed by sideways OVERLAP of a filled orbital on the metal with empty antibonding `pi_(2py)^(**)` orbital of CO.
Discussion
17099.

Using data provided, calculate the multiple bond energy (kJ mol^(-1)) of a C-=C bond in C_(2)H_(2). The energy is ( C-H bond energy=350 kJ "mol"^(-1)) 2C(s)+H_(2)(g) to C_(2)H_(2)(g), DeltaH=225 kJ mol^(-1) 2C(s) to 2 C(g), DeltaH=1410 kJ mol^(-1) H_(2)(g) to 2 H(g), DeltaH=330 kJ mol^(-1)

Answer»

1165
837
865
815

Solution :`1410+330-(2xx350)+X=255`
x is HEAT of FORMATION of C -=C BOND
Discussion
17100.

Transition metal with lowest atomic number

Answer»

Sc
Ti
Cu
Zn

Answer :A
Discussion