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12801.

Which of the following is correct for critical temperature

Answer»

It is the highest temperature at which LIQUID and vapour can coexist
Beyond the critical temperature, there is no distinction between the two PHASES and a gas cannot be LIQUEFIED by compression
At critical temperature `(T _(c ))`the SURFACE tension of the system is zero
At critical temperature the gas and the liquid phases have different critical densities.

Solution :n/a
Discussion
12802.

Write the structure of the following compound: 2-methyl1-2-ethoxypentane

Answer»

SOLUTION :`CH_(3)-CH_(2)-CH_(2)-UNDERSET(OC_(2)H_(5))underset(|)OVERSET(CH_(3))overset(|)(C)-CH_(3)`
Discussion
12803.

Which of the following hydroxide is soluble in excess of NaOH

Answer»

`Fe(OH)_(3)`
`CR(OH)_(3)`
`Al(OH)_(3)`
All

Solution :`Al(OH)_(3)+NaOH RARR underset(("soluble"))(NaAlO_(2))+2H_(2)O`
Discussion
12804.

The wave function psi_(n,l,m) is a mathematical function whose value depends upon spherical polar coordinates (r, theta, phi) of the electron and characterized by the quantum numbers n,l and m. Here r is distance from nucleus theta is colatitude and phi is azimuth. In the mathematical functions given in the Table, Z is atomic number and a_(0) is Bohr radius. For He^(+) ion the only Incorrect combination is

Answer»

(II)(ii)(Q)
(I)(i)(S)
(I)(i)(R)
(I)(III)(R)

SOLUTION :1s orbital can not have `THETA` function (ANGULAR function)
Therefore D is incorrect.
Discussion
12805.

The wave function psi_(n,l,m) is a mathematical function whose value depends upon spherical polar coordinates (r, theta, phi) of the electron and characterized by the quantum numbers n,l and m. Here r is distance from nucleus theta is colatitude and phi is azimuth. In the mathematical functions given in the Table, Z is atomic number and a_(0) is Bohr radius. For the given orbital in Column 1 the only Correct combination for any hydrogen -like species is

Answer»

(IV)(iv)(R)
(II)(ii)(P)
(III)(iii)(P)
(I)(ii)(S)

Solution :`underset(U)(2S"orbital-one RADIAL")underset(u)(NODE)(n-l-1)`.
Discussion
12806.

Violet coloured complex among the following list of compounds is

Answer»

`[Ni(H_2O)_6]^(2+)`
`[Ni(H_2O)(en)]^(2+)`
`[Ni(H_2O)_2(en)_2]^(2+)`
`[Ni(en)_3]^(2+)`

ANSWER :D
Discussion
12807.

Write the formula of the following compound: Ammonium diamine tetra-thiocyanato chromate (III)

Answer»

SOLUTION :NH_4[CR(NH_3)_2(SCN)_4]
Discussion
12808.

Which of the following will be completely or partially dissolved in NH_(4)OH ?

Answer»

AgCl
AgBr
Agl
`BaSO_(4)`

ANSWER :A::B::C
Discussion
12809.

Write the IUPAC name of the following compound :

Answer»

SOLUTION :AL N-Ethyl-N-methylpropanamine.
Discussion
12810.

Which one of the following graph is not correct

Answer»




ANSWER :D
Discussion
12811.

Which trivalent cation is largest in lanthanoid series?

Answer»

Solution :`LA^(3+)` ion is the largest in lanthanoid SERIES.
Discussion
12812.

Which one of the following compound is an optically active compound?

Answer»

`CH_3CH_2COCH_3`
`CH_3CH(OH)COOH`
`HOOC CH_2COOH`
`HCH(OH)COOH`

Answer :B
Discussion
12813.

Which is incorrect

Answer»

NOVESTROL - Antifertility drug
Serotonine - tranquilizer
Narrow spectrum - CHLORAMPHENICOL antibiotic
Rentae- Antacid

ANSWER :C
Discussion
12814.

What are broad-spectrum antibiotics? How are polythene and neoprene prepared?

Answer»

Solution :Those antibiotics which are EFFECTIVE against a wide RANGE of GRAM positive and gram negative bacteria are known as BROAD - spectrum antibiotics.
Polyethene:
`nCH_(2) = CH_(2) overset("Polymerisation")(to) underset("REPEATING unit")(CH_(2) - CH_(2)) - to -(underset("Polyethene")(CH_(2) - CH_(2)))_(n) -`
Discussion
12815.

Between white & red phosphorus which one is more reactive & why?

Answer»

Solution :White phosphorus is a tetrahedral `(P_(4))` MOLECULE in which the four P atoms are linked to each other by single COVALENT bonds. These `(P_(4))` molecules are held together by WEAK van der Waals forces of attraction. In each `(P_(4))` molecule, the P - P - P bond angle ( 60°) is less than that between TWO pure p -orbitals `(90^(@))` and hence, it suffers from internal angle strain. Due to weaker forces of attraction and considerable angle strain, white phosphorus is very reactive. On the other hand, in red phosphorus, these `P_(4)` tetrahedra are joined together through covalent: bonds to give a polymeric structure. ln this structure, the angle strain is relatively low (average P - P- P bond angle: `101^(@)`) and as a result, the P-P bonds become relatively stronger. Since greater amount of ENERGY is required to convert these giant molecules into atoms by breaking relatively stronger covalent bonds, therefore white phosphorus is more reactive than red phosphorus.
Discussion
12816.

Which one of the following is non-polar molecular solids ?

Answer»

DIAMOND
SiC
ANTHRACENE
Glass

Solution :Anthracene
Discussion
12817.

Which of the ores mentioned in Table 6.1 can be concentrated by magnetic separation method?

Answer»

Solution :Ores which are magnetic in NATURE can be separated from the non-magnetic impurities by magnetic SEPARATION. For example, ores of iron such as haematite `(Fe_(2)O_(3))`, MAGNETITE `(Fe_(3)O_(4))`, siderite `(FeCO_(3))` and iron PYRITES `(FeS_(2))` being magnetic can be seprarated from non-magnetic impurities by magnetic separation method.
Discussion
12818.

Which of the following is isolated in pure form

Answer»

`HClO_(4)`
`HClO_(3)`
`HClO_(2)`
HClO

Solution :HClO DECOMPOSES to give `Cl_(2)` and WATER. `HClO_(2)` undergoes auto-oxidation to give HClOand `HClO_(3)`. `HClO_(3)` is stable only in dark. In presence of light, it releases CHLORINE and therebyacts as OXIDIZING agent. `HClO_(4)` is very stable one, hence obtained in pure FORM.
Discussion
12819.

What is the role of graphite rod in the electrometallurgy of aluminium ?

Answer»

Solution :The graphite rod is useful in the ELECTROMETALLURGY of ALUMINIUM for REDUCTION of alumina to aluminiu.
`M2Al_2O_3 + 3C to 4AL + 3CO_2`
Discussion
12820.

Which of the following combinations give t-butyl alcohol when treated with Grignard.s reagent:

Answer»

`CH_3MgBr + CH_3COCH_3`
`C_2H_5MgBr + CH_3COCH_3`
`CH_3MgBr + (CH_3)_3C*OH`
`CH_3MgBr + CH_3CH_2CHO`

ANSWER :A
Discussion
12821.

Whatare essential and non - essential amino acids in human food ? Give one example of each type.

Answer»

SOLUTION :ESSENTIAL amino acids : AMINOACIDS whichcannot be synthesised in the human body and mustbe obtainedthrough dietare known as essential amino acids . For EXAMPLE ,valine, leucineetc.
Non - essential amino acids : Theamino acidswhich can be synthesised in the human body ARECALLED non - essentialamino aicds. For example , glycine ,alanine , etc.
Discussion
12822.

When a linkage isomerism is possible for co-ordination compounds ?

Answer»

SOLUTION :When a co-ordination COMPOUND CONTAINS an AMBIDENTATE LIGAND.
Discussion
12823.

Write the overall redox reaction for the zinc-copper cell. Show the oxidation and reduction half reaction.

Answer»

SOLUTION :Overall redox reaction.
`Zn_((s))+Cu_((aq))^(2+) RARR Zn_(aq)^(2+)+Cu_((s))`
oxidation half reaction :
`Zn_((s))+Cu_((aq))^(2+) rarr Zn_(aq)^(2+)+2e^(-)`
REDUCTION half reaction :
`Cu^(2+)+2e^(-) rarr Cu_((s))`
Discussion
12824.

Unit of specific conductance is _________.

Answer»

SOLUTION :`OHM^(-1)CM(-1).
Discussion
12825.

Which one of PCl_4^(+) and PCl_4^(-) is not likely to exist and why ?

Answer»

Solution :`PCl_5` is ionic in NATURE in solid STATE because it EXISTS as `[PCl_4]^(+) [PCl_6]^(-)`. THEREFORE `PCl_4^(-)` is not likely to EXIST .
Discussion
12826.

Tin and lead form divalent Sn (II) and lead (II) and tetravalent i.e., Tin (IV) and lead. (IV) compounds. Tetravalent and dioxides of lead and Tin are amphoteric in nature. Lead tetra fluorite is ionic solid where as PbCl_(4) is covalent. Pbl_(4) does not exist. lead (II) halides are white whereas Pbl_(2) is yellow in colour. Q. Reaction of SnO with NaOH gives

Answer»

`Na_(2)SnO_(2)`
`H_(2)SnO_(2)`
`Na_(3)SnO_(2)`
`SnO_(2)`

Answer :A
Discussion
12827.

Which of the following halide is hydrolysed ?

Answer»

`NH_3`
`SF_6`
`PF_3`
`IF_3`

ANSWER :D
Discussion
12828.

What are biomolecules ?

Answer»

SOLUTION :SUBSTANCES like CARBOHYDRATES, proteins, NUCLEIC acids and LIPIDS are called biomolecules.
Discussion
12829.

To prepare a pure sample of n-hexane using sodium metal as one reactant ,the other reactant or reactants will be :

Answer»

Ethyl CHLORIDE and n-butyl chloride
Methyl BROMIDE and n-pentyl bromide
n-propyl bromide
Ethyl bromide and n-butyl bromide

ANSWER :C
Discussion
12830.

Which of the following nuclear reactions will generate an isotope ?

Answer»

Positron emission
`ALPHA`-particle emission
`beta`-particle emission
neutron particle emission.

Solution :An isotope can be generated by the emission of positron, `alpha-` particle or `beta` particle because it will change atomic NUMBER of the parent nucleide. An isotope can be generated when the NUCLEI of an element are bombarded by slow neutron.
e.g. `""_(27)^(59)Co""+_(0)^(1)nto""_(27)^(60)Co`
(it is HYPOTHETICAL PROCESS).
Discussion
12831.

When the monosaccharide is converted to D-glyceraldehyde, then which carbon has the same configuration as in D-glyceraldehyde ?

Answer»

Lowest numbers ASYMMETRIC CARBON
Highest numbered asymmetric carbon
More oxidised carbon
Highest numbered carbon

ANSWER :B
Discussion
12832.

What is the net charge on ferrous ion?

Answer»

`+2`
`+3`
`+4`
`+5`

Solution :Net charge on ferrous ion, `FE^(2+) = +2`
Discussion
12833.

Which of the following can possibly be used us analgesic without causing addiction and any modification ?

Answer»

Morphine
N-acetylparaminophenol
Diazepam
Tetra hydrocatenol

Answer :B
Discussion
12834.

The values of dissociation constants of some acids (at 25^(@)C) are as follows. Indicate which is the strongest acid in water

Answer»

`1.4 XX 10^(-2)`
`1.6 xx 10^(-4)`
`4.4 xx 10^(-10)`
`4.3 xx 10^(-7)`

Solution :More is `K_(a)`, LESSER is `pK_(a)(pK_(a) = - log K_(a))` more is acidic strength.
Discussion
12835.

The wave function psi_(n,l,m) is a mathematical function whose value depends upon spherical polar coordinates (r, theta, phi) of the electron and characterized by the quantum numbers n,l and m. Here r is distance from nucleus theta is colatitude and phi is azimuth. In the mathematical functions given in the Table, Z is atomic number and a_(0) is Bohr radius. For hydrogen atom, the only correct combination is

Answer»

(I)(iv)(R)
(I)(i)(P)
(II)(i)(Q)
(I)(i)(S)

Solution :For H-atom
`underset(1)("Is orbital")-psi_("atom")prop(Z/(a_(0)))^(3//2)E^(-((ZX)/(a_(0))),S`
`E_(4)-E_(2)=-13.6/16-(-13.6/4)=(3xx13.6)/16`
`E_(6)-E_(2)=-13.6/36-(-13.6/4)=(8xx13.6)/36`
`E_(4)-E_(2)` is `27/32` TIMES of `E_(6)-E_(2)`
Discussion
12836.

Which of the following pair of monomers are used in preparation of PHBV ?

Answer»

`beta`-Hydroxy BUTYRIC ACID, `beta`-hydroxy valeric acid
`beta`-Hydroxy valeric acid, Amino caproic acid
`beta`-Hydroxy butyric acid, ADIPIC acid
LACTIC acid, Adipic acid

SOLUTION :`beta`-Hydroxy butyric acid, `beta`-hydroxy valeric acid
Discussion
12837.

When a solution of an electrolyte is heated the conductance of the solution

Answer»

INCREASES because of the ELECTROLYTE conducts better
Decreases because of the INCREASED heat
Decreases because of the dissociation of the electrolyte is suppressed
Increases because the electrolyte is DISSOCIATED more

Solution :Degree of dissociation of weak electrolyte increases on increasing TEMPERATURE.
Discussion
12838.

The standard enthalpy of formation (DeltaH_(f)^(@)) at 298 K for methane,CH_(4)(g), is - 74.8 kJ mol^(-1) The additional information required to determine the average energy for C-Hbond formation would be

Answer»

The dissociation energy of `H_(2)` and enthalpy of sublimation of carbon
Latent HEAT of vapourization of methane
The first four ionization ENERGIES of carbon and electron gain enthalpy of hydrogen
The dissociation energy of hydrogen MOLECULE, `H_(2)`

Answer :A
Discussion
12839.

Transition metals in their compounds show:

Answer»

IONIC bonds
COVALENT bonds
Ionic and covalent bonds
Ionic and co-ordinate bonds

Answer :C
Discussion
12840.

Which is the most suitable reagent among the following to distinguish compound (iii) from the rest of the compounds i. CH_(3)-C-=C-CH_(3) ii. CH_(2)-CH_(2)-CH_(2)-CH_(3) iii. CH_(3)-CH_(2)-C-=CH iv. CH_(3)-CH=CH_(2)

Answer»

BROMINE in carbon TETRACHLORIDE
Bromine in ACETIC acid
ALK. `KMnO_4`
Ammoniacal silver nitrate

Answer :D
Discussion
12841.

Which of the following ions is most unlikely to exist?

Answer»

`LI^(-)`
`Be^(-)`
`B^(-)`
`F^(-)`

ANSWER :B
Discussion
12842.

Which of the following emissions do not cause the emission of X-ray ?

Answer»

`ALPHA`- decay
`BETA`- decay
POSITRON decay
K-electron capture

Solution :In K -electron CAPTURING , x- rays are produced
Discussion
12843.

The standard emfof a galvanic cell can be calculated from

Answer»

the size of the electrode
the pH of the solution
the amount of METAL in the ANODE
the `E^(@)` values of the HALF cells

Solution :`E_("cell")^(@) = E_(RHS)^(@) - E_(LHS)^(@)` , where `E^(@) = E_(SRP)^(@)`
Discussion
12844.

Which is correct about zero order reaction ….

Answer»

rate of REACTION depends on decay constant
rate of reaction is INDEPENDENT of CONCENTRATION
unit of rate constant is `"concentration"^(-1)`
unit of rate constant is `"concentration"^(-1)` `"time"^(-1)`

Answer :B
Discussion
12845.

Which of the following is not the property of natural rubber

Answer»

Low TENSILE strength
HIGH water absorption CAPACITY
soft and STICKY
high elasticity

Answer :D
Discussion
12846.

Where are receptors located ?

Answer»

SOLUTION :RECEPTORS are EMBEDDED in CELL MEMBRANE.
Discussion
12847.

Write the general equation of the preparation of alkyl chlorides from alcohols using SOCl_(2).

Answer»

Solution :`R-OH + SOCI_(pyridi n E) to R-Cl + SO_(2)+ HCI`
Discussion
12848.

Which of the following is the most important factor in making lithium metal, the strongest reducing agent?

Answer»

IONISATION ENERGY
HYDRATION energy
Heat of sublimation
None of these

Answer :B
Discussion
12849.

The species which acts as a Lewis acid but not a Bronsted acid is

Answer»

`NH_(2)^(-)`
`O^(2-)`
`BF_(3)`
`OH^(-)`

Answer :C
Discussion
12850.

What is the relationship between the atoms of stronlum, ""_(38)^(87)Sr and ""_(38)^(90)Sr?

Answer»

SOLUTION :(HINT: They are ISOTOPES)
Discussion