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18751.

Which of the following species has electron releasing (or+I inductive) effect ?

Answer»

`-NO_(2)`
`-COOH`
`(CH_(3))_(2)CH-`
`C_(6)H_(5)^(-)`.

Answer :C
Discussion
18752.

Which of the following is the strongest acid:

Answer»

`HCOOH(pK_a3.77)`
`C_6H_5COOH(pK_a4.22)`
`CH_3COOH(pK_a4.71)`
`CH_3CH_2COOH(pK_a4.88)`

ANSWER :A
Discussion
18753.

The spin only magnetic moment of Mn^(4+) ion is nearly

Answer»

3 BM
6 BM
4 BM
5 BM

Solution :`Mn^(4+)to1s^(2)2^(2)2P^(6)3S^(2)3p^(6)3d^(3)`
`=sqrt(3(3+2))=sqrt(3(5))=sqrt(15)=3.89~~4B.M.`
Discussion
18754.

Write the IUPAC name of following coordinate compounds. [Pt(NH_3)_6]CI_4

Answer»

SOLUTION :Hexammine PLATINUM (IV) CHLORIDE
Discussion
18755.

Which of the following is not correct consequence of Schottky defects ?

Answer»

ELECTRICAL conductivity increases
density DECREASES
lattice energy of crystal increases
STABILITY of crystal decreases.

ANSWER :C
Discussion
18756.

Total charge on 1 mole of a monovalent metal ion is equal to :

Answer»

`6.28xx10^(18)`COULOMB
`1.6xx10^(-19)` coulomb
`9.65xx10^4` coulomb
None

Answer :C
Discussion
18757.

When CS_2 layer containing both Br_2 and I_2 is shaken with excess of Cl_2 water, the violet colour due to I_2 disappears and orange colour due to Br_2 appears. The disappearance of violet colour is due to the formation of

Answer»

`I_(3)^(-)`
`HIO_(3)`
`I Cl_(2)`
`I^(-)`

SOLUTION :`underset("EXCESS") (5 Cl_(2)) + I_(2) + 6 H_(2) O to underset("colourless")(2 HIO_(3)) + 10 HCL`
Discussion
18758.

Vitamin causes coagulation of blood is:

Answer»

`B_1`
D
K
C

Answer :C
Discussion
18759.

The thorium radioactive decay series produced one atom of ""^(208)Pb as the final disintegration product of an atom of ""^(232)Th. t_((1)/(2)) of ""^(232)Th is 1.39 xx 10^(10) years. A certain rock is found to have a mass ratio of ""^(208)Pb and ""^(232)Th as 14:1. Determine the age of the rock.

Answer»

SOLUTION :`2.97 XX 10^(9)` YEARS
Discussion
18760.

Which of the following statements is NOT applicable to electrolytic conductors ?

Answer»

NEW products SHOW up at the electrodes
Ions are responsible forcarrying the current.
Show a POSITIVE TEMPERATURE COEFFICIENT for conductance.
A single stream of electrons flows from cathode to anode

Answer :D
Discussion
18761.

Upon irradiating californium with neutrons , a scientist discovered a new nuclide having mass number of 250 and a half-life of 30 min . 90 min after the irradiation, the observed radioactivity due to nuclide was 100 dis/min . If 3.46 xx 10^(x) atoms of the nucleide were present initially . Then x is ..........

Answer»


SOLUTION :`A_(0) overset(30 "min" ) (to) (A_(0))/(2) overset(30 "min")(to) (A_0)/(4) overset(30 "min" )(to) (A_0)/(8) = 100 implies A_(0) = 800` DPM
`A = lambda N , 800 = (0.693)/(30 ) xx N_(t)` ,where `N_(t) = (800 xx 30)/(0.693) = 3.46 xx 10^(4)` ATOMS
Discussion
18762.

Which of the following has highest molar conductivity ?

Answer»

Diamminedichloro platinum (II)
Tetraamminedichlorocobalt (III) chloride
POTASSIUM hexacyanoferrate (II)
Hexaaquochromium (III) chloride

Answer :B
Discussion
18763.

What is the name given to the species which have the same composition in liquid and vapour phase ?

Answer»

SOLUTION :AZEOTROPE
Discussion
18764.

What is the product obtained when chloroform is treated with concentrated nitric acid ?

Answer»

`CCl_3NO_2`
`COCl_2`
`CH_3CCl`
`CH_3COCl`

ANSWER :A
Discussion
18765.

Which of the following gives a yellow oily liquid with nitrous acid

Answer»

Methylamine
Aniline
Dimethylamine
Tri-methyl amine.

Answer :C
Discussion
18766.

Total volume of atoms present in face centred cubic unit cell of metal is ( r is atomic radius )

Answer»

`( 24)/( 3) pi r^(3)`
`( 12)/( 3) pi r^(3)`
`( 16)/( 3) pi r^(3)`
`( 20)/( 3) pi r^(3)`

Solution :No. of atoms present per UNIT cell in FCC arrangement =4
Total volume of atoms present
`= 4 xx ( 4)/( 3) pi r^(3) = ( 16)/( 3) pi r^(3)`
Discussion
18767.

Which of the following is not antioxidant ?

Answer»

Butylated HYDROXY anisole
Citric ACID
Ascorbic acid
Propionic acid 

ANSWER :D
Discussion
18768.

Which of the following molecules has the higehest bond angle ?

Answer»

`BF_(3)`
`NH_(3)`
`SO_(2)`
`SF_(6)`

ANSWER :A
Discussion
18769.

Which of the following relation is true for standard gibbs free energy change (DeltaG^(@)) and equilibrium constant Kp?

Answer»

`Kp=E^(-DELTAG^(@)//RT)`
`Kp=-RT" LN "DeltaG^(@)`
`Kp=((e)/(RT))^(DeltaG^(@))`
`Kp=(DeltaG^(@))/(RT)`

SOLUTION :`Kp=e^(-DeltaG^(@)//RT)`
Discussion
18770.

XeF_(2) molecule is :

Answer»

Angular
TRIANGULAR PLANAR
Linear
NONE of these

ANSWER :C
Discussion
18771.

Why are transition elements so named ?

Answer»

SOLUTION :This is because their PROPERTIES are in between those of s-block and p-block
Discussion
18772.

Which of the following is an appropriate set of reactants for the preparation of 1-methoxy-4-nitrobenzene and why?

Answer»

SOLUTION :It is an example of Williamson.s reaction. It follows `S_(N)^(2)` mechanism where the phenoxide ion attacks the halide. The reaction will take place easily if there is least STERIC hindrance. THEREFORE, set (ii) of the REACTANTS is appropriate for the preparation of 1-methoxy-4-nitrobenzene.
Discussion
18773.

Which of the following reaction is shown by alkynes:

Answer»

Addition
Substitution
Polymerization
All of the above

Answer :D
Discussion
18774.

Which method of preparation of sol involves chemical reaction?

Answer»

HYDROLYSIS
MECHANICAL dispersion
Exchange of SOLVENT
All of these

Answer :A
Discussion
18775.

When a manganous salt is fused with a mixture of KNO_3and solid NaOH the oxidation number of Mn changes from +2 to

Answer»

`+4`
`+3`
`+6`
`+7`

SOLUTION :` OVERSET(+2) (MnO)+NaOH+KNO_3 toK_2 overset(+6) (MnO_4)_+H_2 O`
Discussion
18776.

Uncertainty in the positionof an electron (mass =9.1xx10^(-31)kg) moving with a velocity 300 ms^(-1 accurate upto 0.001%will be (h=6.6xx10^(-34)Js)

Answer»

`19.2xx10^(-2)m`
`3.84xx10^(-2)m`
`5.68xx10^(-2)m`
`1.92xx10^(-2)m`

ANSWER :D
Discussion
18777.

Which of the following statements is CORRECT about saccharin?

Answer»


It is 550 times sweeter than CANE sugar.
It is used by diabetic PATIENTS.
All of these.

Answer :D
Discussion
18778.

Urea is not used

Answer»

As fertilizer
In the PREPARATION of medicines
In the manufacture of plastic
In the purification of WATER

Solution :UREA is not used in the purification of water because it is very SOLUBLE in water.
Discussion
18779.

Which of the following antacids is an antihistamine ?

Answer»

RANITIDINE
LANSOPRAZOLE
TERFENADINE
Luminal

Answer :a
Discussion
18780.

Two molecules of an aldehyde react with a concentrated solution of caustic soda and produces one molecule of an alcohol and acid each, which one is the aldehyde:

Answer»

Acetaldehyde
Formaldehyde
Propionaldehyde
Butyraldehyde

Answer :B
Discussion
18781.

Which of the following have maximum number of P - H bond ?

Answer»

<P>`H_(3)PO_(2)`
`H_(3)PO_(3)`
`H_(3)PO_(4)`
`H_(4)P_(2)O_(7)`

ANSWER :A
Discussion
18782.

When no heat energy is allowed to enter or leave the system it is called:

Answer»

ISOTHERMAL process
Reversible process
Adiabatic process
Irreversible process

Answer :C
Discussion
18783.

What is an ambidenate ligand?

Answer»

SOLUTION :Ligand which can ligate through two DIFFERENT atoms or ligand having two DONAR atoms.
Discussion
18784.

Which one of the following is formed when ethan-1, 2-diol is treated with PI_3 ?

Answer»

ETHANE
ETHYNE
ETHENE
Ethanol

Solution :Ethene
Discussion
18785.

Which of the following electronic configurations corresponds to elements with largest negative electron gain enthalpy?

Answer»

`1S^(2)2S^(2)2P^(5)`
`1s^(2)2s^(2)2p^(6)`
`1s^(2)2s^(2)2p^(6)3s^(2)3p^(5)`
`1s^(2)2s^(2)2p^(6)3s^(1)`

Answer :C
Discussion
18786.

The total entropy change for a system and its surrounding increases, if the process is

Answer»

reversible
irreversible
exothermic
endothermic

Answer :B
Discussion
18787.

What are type of unit cells ? Give their names.

Answer»

Solution :(i) There are two types of unit cells. a) PRIMITIVE b) Non - primitive
(ii) A unit cell that contains only one LATTICE point is CALLED a primitive unit cell, which is made up from the lattice points at each of the CORNERS.
(iii) In the case of non-primitive unit cells, there are additional lattice points, EITHER on a face of the unit cell or with in the unit cell.
Discussion
18788.

Write the electronic configuration of the element with atomic number 102.

Answer»

SOLUTION :`[RN]^(86) 5f^(14) 6d^(0) 7s^2`
Discussion
18789.

Which one of the follwing is a cause of acid rains ?

Answer»

ozone
AMMONIA
suphur dioxide
carbon MONOXIDE

Solution :Acid rain is caused by a chemical reaction theat begins when compunds like SULFUR dioxide and nitrogen oxides aer RELEASED into the AIR
Discussion
18790.

What is Henderson equation?

Answer»

Solution :Hendersonequation is an equationwhich isusedto determine the ` P^(H)`of an acidbufferwith the HELPOF the DISSOCIATION constant ` K_(a)`of theweakacidand concentration of the acidand the saltused.

For a basicbufferpOH = ` pK_(B) + log ("[salt]")/("[base]")`
Discussion
18791.

Write four assumptions/ Postulates of Arrehenius theory of electrolytic dissociation.

Answer»

Solution :(i) When an electrolyte is dissolved in water its molecules split up into electrically charged particles called ions.
(ii) Total charge on ACTIONS is equal to charge on ANIONS.
(iii) Ionisation is a reversible process.
(iv) Ions are responsible for passing of ELECTRIC current through the solution.
(v) DEGREE of dissociation increases with dilution.
(vi) Property of electrolyte in solution is properties of ions PRESENT in it.
Discussion
18792.

What is secondary cell?

Answer»

SOLUTION :A cell which can be recharged
or
A cell after USE can be recharged by passing current through it in the OPPOSITE direction.
Discussion
18793.

Trichloroacetone reacts with lime water to form :

Answer»

`CH_3CHO`
`CHCl_3`
`CH_3Cl`
`CH_3OH`

ANSWER :B
Discussion
18794.

Which of the following lanthanoid ions is diamagnetic ? (Atomic No,: Ce=58, Sm= 62, Eu= 63, Yb= 70)

Answer»

`EU^(2+)`
`YB^(2+)`
`Ce^(2+)`
`Sm^(2+)`

SOLUTION :`""_(70)Yb^(2+): [Xe] 4f^(14)`
Discussion
18795.

Which of the following statements is not applicable to electrolytic conductors

Answer»

new products show up at the electrodes
Ions are responsible for carryng the current
Show a positive temperature coefficient for conductance
A SINGLE STREAM of electrons flows from CATHODE to ANODE

Solution :In electrolytic conductors, a singlestream of electrons flow from cathode to anode.
Discussion
18796.

Which compound does not give positive test in Lassaigne's test for nitrogen ?

Answer»

Urea
HYDRAZINE
Azobenzene
Phenyl hydrazine

Solution :Hydrazine `(H_2N-NH_2)` do not have carbon so no `CN^-` formation occur with NA EXTRACT.
Discussion
18797.

What is meant by coagulation of colloidal solution ? Describe briefly any three methods by which coagulationof lyophobic sos can be carrid out.

Answer»
Discussion
18798.

Give the simplest formula of a compound containing 50% of element , X (atomic mass =10) and 50% of Y ( Atomic MASS= 20 )

Answer»

XY
`X_2Y`
`XY_2`
`X_2Y_2`

ANSWER :B
Discussion
18799.

What is meant by gold number?

Answer»

SOLUTION :Electrical double layer (i) Zsigmondy introduced the term "Gold number" as a measure of protective POWER of a colloid. (II) Gold number is defined as the number of MILLIGRAMS of hydrophilic colloid that will just prevent the PRECIPITATION of 10ml of gold sol on the addition of Iml of 10% NaCl solution.
Smaller the gold number, greater the protective power.
Discussion
18800.

Which of the following are correct for given structure. (i)Optically active molecule , (ii)Having plane of symmetry , (iii)Having axis of symmetry , (iv)Having centre of symmetry

Answer»

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

SOLUTION :
Discussion