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21001.

Which is more stable PCl_5 or PCl_3 ?

Answer»

SOLUTION :SINCE `PCl_5` on HEATING decomposes to GIVE `PCl_3` and `Cl_2 , `PCl_3` is more stable than `PCl_5`,
Discussion
21002.

The relative lowering of vapour pressure in case of dilute solutions is directly proportional to :

Answer»

Molality
Molarity
Mole fraction
All

Answer :D
Discussion
21003.

Write the IUPAC name of the compound ""CH_(2)(Cl)COCH(CH_(3))CONH_(2)

Answer»


ANSWER :4-chloro-3-methyl-3-oxobutanamide.
Discussion
21004.

Which of the following is picomplex:

Answer»

TRIMETHYL aluminum
Ferrocene
Diethyl zinc
Nickel carbonyl

Answer :B
Discussion
21005.

Which of the following reagents produce ClO_2 ?

Answer»

`Cl_2 + HGO to `
`Cl_2 + O_2 to `
`NaClO_3 + I_2 to `
`NaClO_3 + SO_3 + H_2SO_4 to `

SOLUTION :`NaClO_3 + SO_3 + H_2SO_4 to 2ClO_2 + 2NaHSO_4`
Discussion
21006.

Trihalide which does not undergo hydrolysis easily is

Answer»

`NCl_(3)`
`PCl_(3)`
`PF_(3)`
`PBr_(3)`

ANSWER :3
Discussion
21007.

'X' is an optically active alkane having lowest moleculr mass, product the structure of the major product obtained on monochlorination of 'X'.

Answer»

`CH_(3)-CH_(2)-CH_(2)-overset(CH_(3))overset("|")underset("CL ")underset("|")"C "-CH_(2)-CH_(3)`
`CH_(3)-CH_(2)-CH_(2)-overset(CH_(3))overset("|")"CH"-underset("Cl ")underset("|")"CH"-CH_(3)`
`CH_(3)-CH_(2)-CH_(2)-overset(CH_(3))overset("|")"CH"-CH_(2)-CH_(2)-Cl`
`Cl-CH_(2)-CH_(2)-CH_(2)-overset(CH_(3))overset("|")"CH"-CH_(2)-CH_(3)`

Solution :3-methyl HEXANE is an optically active having lowest molecular mass.
`CH_(3)-CH_(2)-CH_(2)-overset(CH_(3))overset("|")underset("H")underset("|")"C "-CH_(2)-CH_(3)overset(Cl_(2))underset(hv)rarrCH_(3)-CH_(2)-CH_(2)-overset(CH_(3))overset("|")underset("Cl ")underset("|")"C "-CH_(2)-CH_(3)`
Discussion
21008.

The work done during the expansion of a gas from a volume of 4dm^(3) to 6dm^(3) against a constant external pressure of 3 atm is (1L atm = 101.32 J)

Answer»

`+ 304 J`
`- 304 J`
`- 6 J`
`-608 J`

SOLUTION :`W=-pDeltaV, W=-3xx(6-4)`
`W=-6xx101.32(THEREFORE "1 L atm=101.32 J")`
W=-608 J
Discussion
21009.

Which is not correct ?

Answer»

Borax : CYCLIC, 2-(six member ring)
Calgon : Cyclic, (10 member ring)
BERYL : Cyclic silicate
`P_(4)O_(10)` : Cyclic, four -(Six member ring)

ANSWER :B
Discussion
21010.

Which one of the following statements is false

Answer»

Work is a state function
Temperature is a state function
Change in the state is completely defined when the INITIAL and final states are specified
Work APPEARS at the boundary of the system

Solution :Work is not a state function because it depends UPON the PATH followed.
Discussion
21011.

What happens when methyl iodide is treated with sodium methoxide ?

Answer»

SOLUTION :When METHYL iodide reacts with sodium methoxide dimethyl ether results.. This is known as WILLIAMSON synthesis of ether.
`underset (methyl iodide)(CH_3-I)+underset(sodium methoxide)(NaO-CH_3)rarrunderset(Diethyl ether)(CH_3-O-CH_3) +NAI`
Discussion
21012.

Which of the following exist in dimer ?

Answer»

`N_(2)O_(5)`
`N_O_(4)`
`NO_(2)`
`N_(2)O_(3)`

Answer :C
Discussion
21013.

Which of the following will form a cycloalkane on debromination with Zinc dust? (a)1, 3-propylene dibromide (b)Methylene dibromide (c ) Ethylidene dibromide Isopropyl bromide

Answer»

[A] and [B]
[B] and [C]
[A] only
[A] and [D]

ANSWER :C
Discussion
21014.

Which salt of potassium contains anions with bent shape.

Answer»

`KI_3`
`KN_3`
`K_2S_2`
`K_2O_2`

ANSWER :C
Discussion
21015.

The threshold wave length (lambda_(0)) of sodium metal is 6500 Å. If uv light of wave length 360Å is used, what will be the kinetic energy of the photoelectron?

Answer»

SOLUTION :`52.1xx10^(-12)ERG`
Discussion
21016.

Which of the following involves sp^(3) hybridisation and are tetrahedral?

Answer»

`Ni(CO)_(4)`
`[Cu(NH_(3))_(4)]^(2+)`
`[Cu(CN)_(4)]^(3-)`
`[ZN(NH_(3))_(4)]^(2+)`

Solution :All are `sp^(3)` hybridised and have tetrahedral SHAPE.
Discussion
21017.

Which of the following aqueous solution has the highest feezing point ?

Answer»

`0.1 mHCl`
`0.05` m SUCROSE
`0.1` m glucose
`0.1` m Nacl.

SOLUTION :Concentration is minimum in surcros HENCE depressionnin freezing point is minimum, actual feezing point is HIGHEST.
Hence, (B) is the correct answer.
Discussion
21018.

Which of the following statement is correct ? 1. electron withdrawing groups stabilize the phenoxide ion and increase the acidic strength 2. electron donating groups destabilise the phenoxide ion and decrease the acidic strength. 3. -OH group in phenol is ortho and para directing. 4. Intermolecular H-bonding is present in phenol

Answer»

1, 3
1, 2
3, 4
1, 2, 3, 4

Answer :D
Discussion
21019.

The standard reduction potentials of Zn^(2+)//Zn,Cu^(2+)//Cu and Ag^(+)//Ag are respectively -0.78, 0.34 and 0.8 V. The following cells were constructed:(1)Zn |Zn^(2+)|| Cu^(2+)|Cu(2)Zn |Zn^(2+)|| Ag^(+)|Ag(3)Cu |Cu^(2+)|| Ag^(+)|Ag What is the correct order of of these cells?

Answer»

`B GT C gt a`
`b gt a gt c `
`a gt b gt c `
c gt a gt b`

ANSWER :B
Discussion
21020.

Which of the following gives silver mirror with ammoniacal silver nitrate?

Answer»

BENZYL alcohol
benzal chloride
Benzioic ACID
Benzene

Answer :B
Discussion
21021.

When 1-phenyl-2-chloropropane, is heated with alcoholic KOH, the product is ________.

Answer»

1-phenylpropene
2-phenylpropene
1-phenylpropan-2-ol
1-phenylpropan-1-ol

Answer :A
Discussion
21022.

Which of the following Lewis structure isnot valied for Azide ion (N_(3)^(-)) ?

Answer»

`:N-=N-underset(..)overset(..)N:^(2-)`
`:N-=overset(+)N-underset(..)overset(..)N:^(2-)`
`:underset(..)overset(-)N-=overset(+)N=underset(..)overset(-)N:`
None of these

Solution :For Zzide ion
`n_(1)=3xx5+1=16e^(-)` (in valence shell)
`n_(2)=3xx8=24`
`n_(3)=24-16=8,bpr =(8)/(2)=4`
`n_(4)=16-8=8` inpr `=(8)/(2)=4`
In 1 ST Lewis structure of Azide ion - F.C. on N (a)=5-3-2=0(correct)
`:N-=N-underset(..)overset(..2)N` F.C. on N(b)=5-4=+1 (not shown in option)
F.C. on N(c)=5-1-6=-2(correct)
So 1st Lewis structure show WRONG representation of formal charge on N(b).
Discussion
21023.

What are biomolecule ?

Answer»

Solution :Complex lifeless chemical substances which not only bulid up the LIVING systems (creatures). But are also RESPONSIBLE for their growth, maintenance and their ability to reproduce are called biomolecules. For EXAMPLES , carbohydrates , proteins , nucleic acids , enzymes , HORMONES , VITAMINS , etc.
Discussion
21024.

Which will undergo reaction with ammonical AgNO_3

Answer»


`CH_3-CH=CH-C-=CH`
`CH_3-CH_2-CH=CH-CH_2-CH_3`
`CH_2=CH-CH_2-CH_3`

SOLUTION :`CH_3-CH=CH-C-=C-H`. Acidic hydrogen (H ATOM attached to triple bond ) is present therefore it GIVES reaction with ammonical `AgNO_3`
Discussion
21025.

Which one of the following is called a carbylamine?

Answer»

RCN
`RCONH_(2) `
RCH= NH
RNC

Answer :D
Discussion
21026.

Which pair of the element will have the same chemical properties ?

Answer»

`3,11`
`13,22`
`2,4`
`4,24`

ANSWER :A
Discussion
21027.

Which of following metal oxide (s) can be reduced to the corresponding metal by hydrogen a)M o O_(3)b) WO_(3)c) Fe_(2)O_(3)d) ZnO The correct match is

Answer»

only a and B
a, b and d
a and c
a only

ANSWER :A
Discussion
21028.

Which is the correct order for the hydration energy of alkali metal ions?

Answer»

`Li^+gt K^+gt Na^+gt Rb^+gtCs^+`
`Li^+gt Na^+gt K^+gt Cs^+gtRb^+`
`Li^+gt Na^+gt K^+gt Rb^+gtCs^+`
`Li^+gt K^+gt Na^+gt Cs^+gtRb^+`

ANSWER :C
Discussion
21029.

Which is the most suitable reagent for the following conversion? CH_(3)-CH=CH-CH_(2)-overset(oversetO(||))(C)-CH_(3) to CH_(3)-CH=CH-CH_(2)-overset(oversetO(||))(C)-OH

Answer»

TOLLENS' reagent
`I_(2)` and NaOH solution
Benzoyl PEROXIDE
Sn and NaOH solution

Solution :
Discussion
21030.

The X-X bond length is 1.5 Å and Y-Y bond length is 1.48 Å.If electronegativity values of X and Y are 3 and 3.5 respectively,then Y-X bond length would be

Answer»

`1.44` Å
`0.98` Å
`1.75` Å
`0.73` Å

Answer :A
Discussion
21031.

Which of the following has asymmetric carbon atoms ?

Answer»




ANSWER :D
Discussion
21032.

The standard free energy change of the reaction M_((aq))^(+)+e rarrr M_((s)) is -23.125kJ. Calculate the standard emf of the half cell.

Answer»

SOLUTION :`E^(@)=+0.25V`
Discussion
21033.

Which of the following alkenes is the most reactive towards cationic polymerisation ?

Answer»

`CH_(2) = CHCH_(3)`
`H_(2)= CHCI`
`H_(2)C= CHC_(6)H_(5)`
`H_(2)C= CHCO_(2)CH_(3)`

ANSWER :C
Discussion
21034.

Write the structure of the major product of the aldol condensation of benzaldehyde with acetone.

Answer»

SOLUTION :
Discussion
21035.

Which of the following does not show optical activity ?

Answer»

`[CO(EDTA)]^(-)`
`[Pt(bn)_(2)]^(2+)`
`[Pt(pn)_(2)]^(2+)`
`[Pt(en)_(2)]^(2+)`

ANSWER :D
Discussion
21036.

Which of the following kind of catalysis can be explained by the adsorption theory?

Answer»

Homogenous CATALYST
Acid-base catalyst
Heterogeneous catalyst
ENZYME catalyst

Solution :ADSORPTION theory is APPLIED to heterogeneous catalysis.
Discussion
21037.

Which of the following ketoesters are not likely to have been prepared by Claisen condensation?

Answer»

`CH_(3)CH_(2)-OVERSET(O)overset("||")C-UNDERSET(CH_(3))underset(|)CH-overset(O)overset("||")C-OC_(2)H_(5)`
`Ph-CH_(2)-overset(O)overset("||")C-underset(CH_(3))underset(|)CH-overset(O)overset("||")C-OC_(2)H_(5)`
`Ph-overset(O)overset("||")C-CH_(2)-overset(O)overset("||")C-OC_(2)H_(5)`
`CH_(3)-CH_(2)-overset(O)overset("||")C-O-CH_(2)-CH_(2)-overset(O)overset("||")C-OC_(2)H_(5)`

Answer :B::D
Discussion
21038.

What are polymers ?

Answer»

Solution :POLYMERS are high molecular MASS `(10^(3)-10^(7)u)` substances CONSISTING of a very large number of simple REPEATING structural units joined together through covalent bonds in a linear fashion. Polymers are ALSO called macromolecules. Some examples of polymers are : polythene, nylon 6,6 backlite, rubber , etc.
Discussion
21039.

Which of the following valence electron experiences maximum effective nuclear charge?

Answer»

`4S^(1)`
`4P^(1)`
`3d^(1)`
`2p^(3)`

Answer :D
Discussion
21040.

The standard reduction potentials of Fe^(3+)//Fe and Fe^(2+)//Fe electrode systems are -0.035 V and -0.44V respectively. Predict which of the two oxidations is easy : Fe^(3+)//Fe and Fe^(2+)//Fe.

Answer»

SOLUTION :`FE^(2+)//Fe`
Discussion
21041.

What is the main reason for the fact that carboxylic acids can undergo ionisation.

Answer»

Absence of `alpha`- hydrogen
RESONANCE STABILISATION of the carboxylate ion
High REACTIVITY of `alpha`- Hydrogen
Hydrogen BONDING

Answer :B
Discussion
21042.

The r.m.s. velocity of hydrogen is sqrt( 7) times the r.m.s. velocity of nitrogen. If T is the temperature of the gas :

Answer»

`T(H_(2)) = T ( N_(2))`
`T ( H_(2)) GT T ( N_(2))`
`T( H_(2)) LT T ( N_(2))`
`T( H_(2)) = SQRT( 7) T ( N_(2))`

Answer :A
Discussion
21043.

Total number of stereoisomers of compound is: CH_(3)-underset(overset(|)(OH))(C)H-underset(overset(|)(Br))(C)H-CH_(3)

Answer»

2
4
6
8

Answer :B
Discussion
21044.

Which one of the following has the lowest boiling point ?

Answer»

`CH_2Cl`
`C_2H_5Cl`
`C_2H_5Br`
`C_2H_5I`

Solution :ORDER of B.P.. s:
`R - F lr R - CL lt R lt Br lt R - I`
If M.wt. INCREASES, MOLECULAR attraction also increases
Discussion
21045.

Tyndall effect in colloidal solution is due to:

Answer»

Scattering of LIGHT
Reflection of light
ABSORPTION of light
presence of ELECTRICALLY CHARGED particles

Answer :A
Discussion
21046.

Whichof the followingcan notbe accetylated ?

Answer»

`CH_(3)NH_(2)`
`(CH_(3))_(2)NH`
`(CH_(3))_(3)N`
`(CH_(3))_(3)CNH_(2)`

ANSWER :C
Discussion
21047.

What happens when acetaldehyde is treated with a few drops of concentrated H_2SO_4 ?

Answer»

SOLUTION :ACETALDEHYDE polymerises to a TRIMER, PARALDEHYDE
Discussion
21048.

Which of the following are low spin complexes which follow EAN rule?

Answer»

`Cr(CO)_(6)`
`[Cr(CN)_(6)]^(4-)`
`PtCl_(6)^(2-)`
`[CU(NH_(3))_(3)CO]^(o+)`

SOLUTION :NA
Discussion
21049.

Which is incorrect statement ?

Answer»

Strach is a POLYMER of `alpha -D ` GLUCOSE
AMYLOSE is a component of cellulose
Structure of galactose has FIVE carbons and one oxygen in cycle.
Fructose is reducing sugar

Answer :B
Discussion
21050.

Which one of the following alkali metals is the most abundant in the earth's crust ?

Answer»

Li
Na
Rb
Cs

Answer :B
Discussion