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16551.

underset(("All isomers")) (C_(2)FCIBrl) overset(H_(2)//Ni)(to)X (excluding stereoisomers) Find the value of X+Y

Answer»


SOLUTION :
Discussion
16552.

Which of the following cations precipitates as their hydroxides?

Answer»

`FE^(+3)`
`AL^(+3)`
`CR^(2+)`
`Zn^(+2)`

SOLUTION :`Fe(OH)_(3), Al(OH)_(3), Cr(OH)_(3)`
Discussion
16553.

Which of the following will yield phenlhydrazine hydrochloride ?

Answer»

BENZENAMINE and hydrazine
Hydrazine and `HCL`
Benzenediazonium chlorid and ` SnCl_2//HCl`
NITROBENZENE and `SnCl_2//HCl`

Solution :` (##KSV_CHM_ORG_P2_C15_E01_109_S01.png" width="80%">
Discussion
16554.

Write the conjugate acids for the following Bronsted bases: NH_2^(-),NH_3 and HCOO^-

Answer»

SOLUTION :`NH_2,NH_4^(+) and HCOOH`
Discussion
16555.

Which of the following is used as an oxidiser in rocket propellants

Answer»

Kerosene
Nitric ACID
LIQUID oxygen
Liquid hydrogen

Answer :B::C
Discussion
16556.

Which gas can most readly liquified

Answer»

`NH_(3)`
`CI_(2)`
`SO_(2)`
`CO_(2)`

ANSWER :C
Discussion
16557.

Which of the following curves represents the Henry's law ?

Answer»




ANSWER :A
Discussion
16558.

Which of the following is correct for zeise.s salt ?

Answer»

The complex ion is SQUARE planar
The CMI, Pt is in + 2 OXIDATION state
`H_(2)C=CH_(2)` Molecule is perpendicular to the `PtCl_(3)` plane
All of these

ANSWER :D
Discussion
16559.

The standard state Gibba free energies of formations of C("graphite") and ("diamond") at T =298k are DeltafG^(@) [ C("graphite") = " O "kJ mol^(-1) DeltafG^(@) [ C("graphite") = " O "kJ mol6^(-1) The standed state means that the presses should be 1 bar, and substance of graphite [C(graphite)] to diamond [C(diamond )] reduces its volumeby 2xx 10^(10) m^(-1)If C(graphite) is converted to C(diamond ) isothemally at T= 298k the pressure at which C( graphite) is in equilibrium with C(diamond) ,is [ useful infromation : 1 J - Kgm^(2) s^(-2)1pa = 1kg m^(-1)s^(-2) : 1^(-) = 10 ^(5) pa]

Answer»

58001 BAR
1450 bar
14501 bar
29001

Answer :C
Discussion
16560.

Two solutions of X and Y electrolytes are taken in two beakers and diluted by adding 500mL of water. Lambda_m of X increases by 1.5 times while that of Y increases by 20 times, what could be the eletrolytes X and Y?

Answer»

X `to` NACL , Y `to` KCl
X `to` NaCl , Y `to CH_3COOH`
X `to` KOH, Y `to` NaOH
X `to CH_3COOH` , Y `to` NaCl

Solution :Electrolyte X is STRONGELECTROLYTE as on dilution the number of ions REMAIN same , only interionic ATTRACTION decreases and hence not much INCREASE in `Lambda_m` is seen . While `Lambda_m` for a week electrolyte increases significantly
Discussion
16561.

What is ferromagnetism? Give an example for ferromagnetic substance.

Answer»

Solution :FERROMAGNETISM is the basic MECHANISM by which CERTAIN materials form permanent MAGNETS or are attracted to magnets, e.g. IRON, nickel, cobalt.
Discussion
16562.

Which of the following does not represent the correct squence of indicated properties ?

Answer»

`[FeF_(6)]^(3-) gt [NiF_(6)]^(3-)` : Magnetic moment <BR>`[Fe(CN)_(6)]^(3-) lt [Fe(NH_(3))_(6)]^(3+)` :stability constant
`NI gt CaO gt BeO` : Basic character
`F_(2) lt Cl_(2) lt Br_(2) lt T_(2)` : Colour intensity

Solution :Stability : `[Fe(CN)_(6)]^(3-) gt [Fe(NH_(3))_(6)]^(3+)`
Basic character : `CaO gt BeO gt NiO`
Discussion
16563.

Which of the following statements are correct about the reaction intermediate?

Answer»

Intermediate (iii) is UNSTABLE because in this CARBON is attached to 5 atoms.
Intermediate (iii) is unstable because carbon atom is `sp^(2)` hybridised.
Intermediate (iii) is stable because carbon atom is `sp^(2)` hybridised.
Intermediate (iii) is less stable than the reactant (ii).

SOLUTION :(a,d) are both CORRECT statements about the reaction intermediate.
Discussion
16564.

Which one has the highest melting point ?

Answer»

IONIC CRYSTAL
Molecular crystal
Covalent crystal
Metallic crystal

ANSWER :C
Discussion
16565.

Which isbest reagent to convert cyclohexanol tocyclohexene

Answer»

CONC. HCL
conc. HBR
conc. `H_2SO_4`
LUCAS reagent

Answer :C
Discussion
16566.

Which of the following statement is WRONG about detergent?

Answer»

They are USED in soft WATER only.
They are used both in soft and hard water.
they DECREASE the surface tension of water.
They can be prepared from BENZENE sulphonic acid.

Answer :A
Discussion
16567.

Whatis denaturationand renaturationof proteins ? Give reason: Amyloseprsentin the salvia becomes inactivein thestomach.

Answer»

SOLUTION :(a) The PROCESS of disruptionof `2^(@)`and `3^(@)` structureof PROTEINS withoutchangingitsprimarystructure is calleddenaturation.
(b)In stomach the pH is acidic , thereforeamylose becomes inactive . That iswhy digestionof carbohydratesdoes nottake place in stomach .
Discussion
16568.

Which of the following oxides compound Mn shows maximum radius?

Answer»

`V_(2)O_(5)`
`MnO`
`Cr_(2)O_(3)`
`MnO_(2)`

SOLUTION :Oxides with highest oxidation state ACIDIC.
Discussion
16569.

Which is used as a flux ?

Answer»

CAO
`SiO_2`
Dolomite
All

Answer :D
Discussion
16570.

What mass of NaCl (molar mass "58.5 g mol"^(-1)) must be dissolved in 65 g of water to lower the freezing point by 7.5^(@)C ? The freezing point depression constant, K_(f) for water is "1.86 K kg mol"^(-1). Assume that van't Hoff factor for NaCl is 1.87.

Answer»


Solution :`DeltaT_(F)=iK_(f)m=iK_(f)(w_(2))/(M_(2))xx(1)/(w_(1))xx1000,""7.5=1.87xx1.86xx(w_(2))/(58.5)xx(1)/(65)xx1000 or w_(2)=8.199g.`
Discussion
16571.

What weight of sodium hydroxide should be dissolved to prepare 250 ml of 0.2 M solution ?

Answer»

2g
8g
60g
4g

Solution :Molarity `= ("Wt. of NAOH"xx1000)/("MOL. wt." XX "VOLUME")`
`=0.2= ("Wt. of NaOH" xx 1000)/(40xx250)`
or Wt. of NaOH `= (0.2xx40xx250)/(1000)=2 g`
Discussion
16572.

Which of the following is an animal polysaccharide?

Answer»

Amylose
Cellose
Glycogene
pectin

Answer :C
Discussion
16573.

Whichof the following compounds give a red colouration in Lassaigne's test during detection of nitrogen-

Answer»

`C_(6)H_(5)SO_(3)H`
`(NH_(4))_(2)SO_(4)`

Answer :C::D
Discussion
16574.

Which of the following do not form Grignard reagent :

Answer»

`CH_3F`
`CH_3Cl`
`CH_3Br`
`CH_3I`

ANSWER :A
Discussion
16575.

Which of the following organo-silicon compound on hydrolysis will give a three dimensional silicone

Answer»

`R_(3)SiCl`
`RSiCl_(3)`
`SiCl_(4)`
`R_(2)SiCl_(2)`

Answer :B
Discussion
16576.

Which of the following shall form an octahedral complex?

Answer»

`d^4` (LOW SPIN)
``d^8` (HIGH spin)
`d^6` (low spin)
all of these

Answer :C
Discussion
16577.

Which is a mutual reduction reaction ? A) KMnO_(4)+O_(3) B) H_(2)O_(2)+O_(3) C) Ag_(2)O+O_(3) D) KI+H_(2)O+O_(3)

Answer»

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

Answer :D
Discussion
16578.

The standard reduction potential for Mg^(2+)//Mg is 2.37V and for Cu^(2+)//Cu is 0.337 The E_(cell)^(@)for thefollowingreactionMg+Cu^(2+) rarr Mg^(2+)+Cu is

Answer»

`+2.03 V`
`-2.03 V`
`-2.7 V`
`+2.7 V`

Solution :`E_(cell)^(@) =E_(cathode)^(@)-E_(ANODE)^(@)`
`=E_(CU^(2+)//Cu)^(@)-E^(@)`
`=0.337 -(-2.37 )V=2.7V`
Discussion
16579.

Whenn- hexaneis passedoverCr_(2) O_(3) //Al_(2) O_(3)at873 K ………. Isformed .

Answer»

HEXANE
HEXYNE
benzene
I-Hexene

ANSWER :C
Discussion
16580.

Which one of the following reaction represents calcination ?

Answer»

`2Zn+O_(2) RARR 2ZnO`
`2ZnS+3O_(2) rarr2ZnO+2SO_(2)`
`MgCO_(3) rarr MGO + CO_(2)`
Both (a) and (c)

SOLUTION :`MgCO_(3)rarrMgO+CO_(2)`
Discussion
16581.

Which of the following molecules is expected to be paramagnetic in nature ?

Answer»

`N_(2)`
`H_(2)`
`O_(2)`
`Be_(2)`

ANSWER :C
Discussion
16582.

When degenerate d-orbitals of an isolated atom/ion come under influence of magnetic field of ligands, the degeneracy is lost. The two sets t_(2g)(d_(xy),d_(yz),d_(xz))ande_(g)(d_(z^(2)),d_(x^(2)-y^(3))) are either stabilized or destabilized depending upon the nature of magnetic field. It can be expressed diagramatically as : Value of CFS depends upon nature of ligand and a spectro-chemical series has been made experiment-ally, for tetrahedral complexes Delta_(i) is about 4/9 times to Delta_(0) (CFSE for octahedral complexes). The energy lies in visible region and i.e., why electronic transition t_(2_(g))hArre_(g) are responsible for colour. Such transitions are not possible with d^(0) and d^(10) configuration. For an octahedral complex, which of the following d'-electron configuration will give maximum CFSE?

Answer»

HIGH SPIN `d^(6)(-0.4)`
Low spin `d^(4)(-1.6)`
Low spin `d^(5)(-2.0)`
High spin `d^(7)(-0.8)`

Solution :In presence of a strong field ligand, the crystal field SPLITTING will be high `(PEltDelta_(0))`
`{:(d^(3),""t_(2g)^(3)eg^(0),""-1.2Delta_(0)),(d^(4),""t_(2g)^(4)eg^(0)""-1.6Delta_(0)),(d^(5),""t_(2g)^(4)eg^(0),""-2.0Delta_(0)):}`
Discussion
16583.

The elements of symmetry in a crystal are:

Answer»

Hauy.s LAW of rationality ofindices
The law of constancy of INTERFACIAL ANGLES
The law of constancy of symmetry
None

Answer :C
Discussion
16584.

Which of following pair same Oaszone

Answer»

D-Glucose, Fructose
D-Glucose, D-Mannose
D-Allose, D-Altrose
All

Answer :D
Discussion
16585.

The separation of lanthanoids by the ion exchange method is based on

Answer»

The SOLUBILITY of their NITRATES
SIZE of the HYDRATED ions
Basicity of the hydroxides
Size of the anhydrated ions

Answer :B
Discussion
16586.

Which of the following is the bes scientific method to test the presence of waterin a liquid

Answer»

Use of anhdrous copper sulphate
Use of litmus paper
Taste
Smell

Solution :Anhydrous `CuSO_(4)` is used to TEST presence of water INANY liquid because it CHANGES its colour white to blue.
Discussion
16587.

Two substances having slightly different solubility can be separated by

Answer»

Distillation
Crystallisation
Fractional distillation
Fractional crystallisation

Answer :D
Discussion
16588.

Which is the catalyst and catalyst poison in Haber's process?

Answer»

Solution :In the Haber.s process of the manufacture of AMMONIA, the Fe is CATALYST and it is poisoned by the PRESENCE of `H_2S` .
`3H_2 + N_2 to 2NH_3`, Fe - catalyst , `H_2S`- Catalyst POISON
Discussion
16589.

Which is considered to be the first synthetic polymer:

Answer»

Nylon
Terylene
LDPE
Bakelite

Answer :D
Discussion
16590.

Which of these are liquids at room temperature

Answer»

`TiCl_4`
`Zn`
`Hg`
`CuCl_2`

SOLUTION :`TiCl_5,` Hg MELTING points are LOW
Discussion
16591.

Units of rate constant for a second order reaction is

Answer»

` "MOL L"^(-1)s^(-1)`
`s^(-1)`
`"mol"^(-1)" L s"^(-1)`
`"mol"^(-2)"L s"^(-1)`

Answer :C
Discussion
16592.

What is Teflon ? Write two of its uses.

Answer»

Solution :It is a polymer of tetra-flouroethylene. It is used in non-stick COOKING UTENSILS and ALSO as insulator for MAKING valves.
Discussion
16593.

Write IUPAC name of the following. CH_3CH_2NH_2

Answer»

SOLUTION :AMINOETHANE
Discussion
16594.

The relation between DeltaU is :

Answer»

`DELTAH = Delta U + RT`
`DeltaH = Delta U - Delta_(G)NRT`
`DeltaH = Delta U + Delta_(g)nRT`
`DeltaU = Delta H + Delta_(g)nRT`

Solution :The relationship between `DeltaH and DeltaU` is `DeltaH = DeltaU + DeltanRT`.
Discussion
16595.

which of the following amine will form stable diazonium salt at 273 - 283 K ?

Answer»

`C_(2)H_(5)NH_(2)`
`C_(6)H_(5)NH_(2)`
`C_(6)H_(5)CH_(2)NH_(2)`
`C_(6)H_(5)N (CH_(3))_(2)`

Solution :
This reaction is called as Diazotisation reaction.
Discussion
16596.

Which has the minimum bond energy?

Answer»

H-Br
H-I
I-I
H-H

Answer :C
Discussion
16597.

Which of the following factors affects the adsorption of a gas on solid ?

Answer»

`T_(C)` (cirtical TEMP.)
TEMPERATURE of gas
Pressure of gas
All of them

Answer :D
Discussion
16598.

Which of the following cations precipitates as their sulphides?

Answer»

`Cu^(+2)`
`Pb^(+2)`
`Zn^(+2)`
`NI^(+2)`

SOLUTION :CUS, PbS, ZnS, NIS
Discussion
16599.

When a salt is heated with dilute H_(2)SO_(4) and KMnO_(4) solution, the pink colour of KMnO_(4) is discharged, the salt is:

Answer»

a sulphite
a carbonate
a nitrate
a bicarbonate

Solution :`SO_(3)^(2-)` reduces `KNnO_(4)` to COLOURLESS `Mn^(2+)`
`5SO_(3)^(2-) + 2MnO_(4)^(-) + 6H^(+) to 2Mn^(2+) +5SO_(4)^(2-) +3H_(2)O`
Discussion
16600.

The spin only magnetic moment of [MnBr_4]^(2-)is 5.9BM. Predict the geometry of the complex ion.

Answer»

Solution :Since the coordination number of `Mn^(2+)` ion in the COMPLEX ion is 4, the geometry may be EITHER tetrahedral `(sp^(3))` or square planar `(dsp^(2))`. But the fact that the MAGNETIC moment of the complex ion is 5.9BM, it should be tetrahedral in shape but not square planar. This is because of the presence of 5 UNPAIRED electrons in the d-orbitals.
Discussion