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21601.

Which of the following oxides give chromic acid in sulphuric acid solutions

Answer»

`CrO`
`Cr_(2)O_(3)`
`CrO_(3)`
`CrO_(2)`

ANSWER :C
Discussion
21602.

Which among the following are peroxo acid of sulphur?

Answer»

`H_(2)SO_(3)`
`H_(2)SO_(5)`
`H_(2)S_(2)O_(8)`
`H_(2)SO_(4)`

Solution :OXYACIDS of SULPHUR CONTAINS peroxy bond are called peroxy acids. They are `H_(2)SO_(5), H_(2)S_(2)O_(8)`
`underset((H_(2)SO_(5)))(HO-underset(O)underset(||)overset(O)overset(||)S-O-O)-H""underset((H_(2)S_(2)O_(8)))(HO-underset(O)underset(||)overset(O)overset(||)S-O-O-underset(O)underset(||)overset(O)overset(||)S-OH)`
Discussion
21603.

What is the type of graph between log P and log V at constant temperature?

Answer»

SOLUTION :`"As per Boyle’s law PV" = "constant so" LOGP + logV = logK`. This means `logP = –logV + logK`. The GRAPH of logP vs logV will be a straight line with `"SLOPE" = –1` and `"INTERCEPT" = logK`.
Discussion
21604.

What are analgesics ?

Answer»

SOLUTION :Analgesics are neurologically active drugs which reduce or abolish pain without causing impairment of consciousness, MENTAL confusion, incoordination or paralysis or some other disturbance or disorder of the nervous SYSTEM. For example, ASPIRIN, paracetamol, naproxen, ibuprofen, diclofenac SODIUM, etc.
Discussion
21605.

When 1 Faraday of electricity is passed through CuSO_4 solution, number of atoms formed is :

Answer»

`6.02xx10^(23)`
`3.01xx10^(23)`
2
`6.02 xx10^(23)`

ANSWER :B
Discussion
21606.

The unit of rate constant depends on

Answer»

NUMBER of reactants
concentration terms
order of reaction
molecularity of reaction

Answer :C
Discussion
21607.

Which of the following are the resonating structure of CH_(2)=CH-underset(H)underset(|)(C)=O

Answer»

`CH_(2)=CH-underset(H)underset(|)overset(o+)(C)-overset(Θ)(O)`
`CH_(2)=CH-underset(H)underset(|)overset(Θ)(C)-underset(..)overset(o+)(O):`
`overset(o+)(C)H_(2)-CH=underset(H)underset(|)(C)-overset(Θ)(O)`
`overset(delta+)(CH_(2))overset(...)(-)CHoverset(...)(-)underset(H)underset(|)(C)overset(...)(-)overset(delta-)(O)`

Solution :For a STRUCTURE to be a resonating or contributing structure.
(i) Placement of ATOMS should not change.
(ii) Atoms like carbon cannot have more than eight electrons in their valence shell.
(iii) It is better to have NEGATIVE charge on a more electronegativeatom.
(iv) The shared electrons would move only towards more electronegative atom.
In choice (b) POINTS (iii) and (iv) are violated. Hence it is not a resonating structure.
In (a), all the points are followed, so it is a resonating structure.
In (c), all the points are followed, so it is resonating structure.
In (d), all the points are followed, so it is resonating structure.
Discussion
21608.

Which of the following has the largest size ?

Answer»

Br
Fr
I
`I^-`

ANSWER :B
Discussion
21609.

Which of the following is more acidic oxide ?

Answer»

<P>`Bi_(2)O_(5)`
`Sb_(2)O_(5)`
`P_(2)O_(5)`
`N_(2)O_5`

Answer :D
Discussion
21610.

The variation of pH during the titration of 0.5 N Na_2CO_3 with 0.5 N HCl is shown in the given graph.The following table indicates the colour and pH ranges of different indicators : {:("Indicator","Range of colour change","Colour in acid","Colour in base"),("Thymol blue",1.2 "to" 2.8,"Red","Yellow"),("Bromocresol red",4.2 "to" 6.3,"Red","Yellow"),("Bromothymol blue",6.0"to"7.6,"Yellow","Blue"),("Cresolphethalein",8.2 "to" 9.8,"Colourless","Red"):} Based on the graph and the table which of the following statements are true ?

Answer»

The FIRST equivalence point can be DETECTED by cresolphthalein
The complete neutralisation can be detected by bromothymol blue
The SECOND equivalence point can be detected by bromocresol red.
The volume of HCl required for the first equivalence point is half the volume of HCl required for the second equivalence point.

Solution :(A)First equivalence point pH is in between 8-10 and also this point is in between 8.2 to 9.8 (Indicator range of cresolphthalein)
(B),( C) second equivalence point (complete NUTRALISATION)
(D)`50/2=25`
Discussion
21611.

When an ideal undergoes unrestrained expansion, no cooling occurs because the molecules

Answer»

are above the inversion temperature
exert no attraction FORCE on each
do work equal to LOSS in kinetic energy
collide without loss of energy.

Solution :When an IDEAL gas undergoes expansion, no work is done in OVERCOMING attractive forces. Hence internal energy does not fall and hence temperature also does not fall
Discussion
21612.

What are the ligands and coordination number of [Cr(NH_3)_4(ONO).Cl] NO_3.

Answer»

SOLUTION :Ligands are `NH_3,ONO, CL`. COORDINATION number = 6.
Discussion
21613.

Which reaction does not have the correct oxidising agent ?

Answer»

`CH_(3) - CO CH_(3) overset(PC C) to CH_(3) COOH`
`CH_(3) - CHO overset(Ag(NH_(3))^(+)) to CH_(3) COOH`
`CH_(3) - CHO overset(Cr_(2)O_(7)^(2-)//H^(+)) to CH_(3)COOH`
`CH_(3) CO CH_(3) overset(Cr_(2)O_(7)^(2-)//H^(+)) to CH_(3) COOH`

Answer :A
Discussion
21614.

Which of the following is 'not' a colligative property ?

Answer»

BOILING point
Depression in FREEZING point
Elevation in boiling point
Osmotic pressure

Answer :A::B
Discussion
21615.

Unit of rate constant (k) of a reaction depends on the order of the reaction Value of 'k' of two reaction are given below. Find the order of each reaction k=3xx10^(-2)molL^(-1)s^(-1)

Answer»

SOLUTION :ZERO ORDER
Discussion
21616.

Unit of rate constant (k) of a reaction depends on the order pf the reaction Value of 'k' of two reaction are given below. Find the order of each reaction k=5xx10^(-3)molL^(-1)s^(-1)

Answer»

SOLUTION :SECOND ORDER
Discussion
21617.

Which of the following ions exist as dimer ?

Answer»

`HG^(2+)`
`Cu^(2+)`
`Hg^(+)`
`CD^(2+)`

ANSWER :C
Discussion
21618.

Which of the following will not act as tranquilizer ?

Answer»

Equanil
ANALGIN
Meprobamate
CHLORDIAZEPOXIDE

Solution :Analgin is an antipyretic .
Discussion
21619.

The strongest base in acid medium is

Answer»

Chlorobenzene
Nitobenzene
Aniline
Phenol

Answer :C
Discussion
21620.

Which of the following will exhibit highest boiling point ?

Answer»

HYDROGEN bonding
Van DER WALL's forces
Dipole-dipole attraction
None

Answer :C
Discussion
21621.

Which one of the following alkenes will react fastest with H_2 under catalytic hydrogenation condition

Answer»




Solution :Stability of ALKENE `prop 1/"Heat of hydrogenat ion"`
HENCE, reactivity of alkene `prop` heat of HYDROGENATION of alkenes . In these , cis-alkene are more reactive because of greater strain at the double bond.
Discussion
21622.

Which of the following molecules would have a carbon-halogen bond least susceptible to nucleophilic aromatic substitution reaction?

Answer»


`(AAK_MCP_35_NEET_CHE_E35_010_A01)`

ANSWER :B
Discussion
21623.

Urea reacts with Br, in dil HCl to liberate N_(2). How many moles of bromine is required to completely react with one mole of urea?

Answer»


SOLUTION :3 MOLES
Discussion
21624.

Which is correct graph for following reaction ? PCl_(5)(g)iff PCl_(3)(g)+Cl_(2)(g):Delta_(r)H=+ve

Answer»




None of these

Solution :Rate of reaction`uarr` temperature `uarr` for ENDOTHERMIC reaction temperature `uarr` EQUILIBRIUM CONC. Of `PCl_(3)uarr`
In reversible reaction conc. Of `PCl_(5)ne0`.
At equilibrium rate of forward reaction and rate of backward reaction are equal.
Discussion
21625.

Which complex is colourless ?

Answer»

`K_2CrO_4`
`[Zn(NH_3)_6]^(2+)`
`[Fe(CN)_6]^(3-)`
`K_2[MnO_4]`

Answer :B
Discussion
21626.

The synthesis of alkyl fluorides is best accomplished by :

Answer»

FREE radical FLUORINATION
Sandmeyer's REACTION
Finkelstein reaction
Swarts reaction

Solution :Swart.s reaction : `RI+AgFoverset(DELTA)rarrRF+AgI`
Discussion
21627.

Which of the following is the wrong statements ?

Answer»

ONCl and `ONO^(-)` are not ISOELECTRONIC
`O_(3)` molecule is bent
Ozone is violet -black in solid state
Ozone is diamagnetic gas

Solution :All statement are CORRECT there is no ANSWER
Discussion
21628.

What is the effect of increase of temperature on viscosity of liquid ?

Answer»

SOLUTION :The increase in TEMPERATURE DECREASE the viscosity of a LIQUID.
Discussion
21629.

What aer ambidentate ligands? Give an example.

Answer»

Solution :Monodentate LIGANDS CONTAIN more than one coordinatig ATOMS. Example, `CN^(-)`.
Discussion
21630.

Variation of adsorption at constant pressure is _______.

Answer»

isobar
isotherm
isochor
isomer

Answer :A
Discussion
21631.

Thermodynamics stability is often used in chemical reactions to predict extent of reaction or to predict the preferred product in some reaction. Thermodynamically amore stable substance will be the one which has lower Gibb's free energy.In various cases,it might be decided on the basis of enthalpy, however , that may not always be true. The thermodynamic data Therefore can be used for prdicting stability among isotopes and to decide the possible transformation.Based on this information and the data given below, answer the questions that follow. Date:{:(DeltaH_(f)^(@) "of" Sn_(("white")) =0,DeltaH_(f)^(@) "of" Sn_(("grey")) =- 2.1 kJ//"mole"),(S^(@) "of" Sn_(("white")) = 0,S^(@) "of" Sn_(("grey")) = 44 J//K-"mole"):} All above data at 300K. Density of Sn_((w)) = 7.36 g//ml Density of Sn_((g)) = 5.769 gm//ml One such transformation is 'tin pest' which is an autocatalytic, allotropic transformation of the element tin causing deterioration of tin objects at low temperatures. Which of the following graph is correct for the allotropic transition Sn_(("white")) rarr Sn_(("grey")) at 1 bar and 298 K?

Answer»




ANSWER :C
Discussion
21632.

Thermodynamics stability is often used in chemical reactions to predict extent of reaction or to predict the preferred product in some reaction. Thermodynamically amore stable substance will be the one which has lower Gibb's free energy.In various cases,it might be decided on the basis of enthalpy, however , that may not always be true. The thermodynamic data Therefore can be used for prdicting stability among isotopes and to decide the possible transformation.Based on this information and the data given below, answer the questions that follow. Date:{:(DeltaH_(f)^(@) "of" Sn_(("white")) =0,DeltaH_(f)^(@) "of" Sn_(("grey")) =- 2.1 kJ//"mole"),(S^(@) "of" Sn_(("white")) = 0,S^(@) "of" Sn_(("grey")) = 44 J//K-"mole"):} All above data at 300K. Density of Sn_((w)) = 7.36 g//ml Density of Sn_((g)) = 5.769 gm//ml One such transformation is 'tin pest' which is an autocatalytic, allotropic transformation of the element tin causing deterioration of tin objects at low temperatures. As temperature is reduced, what can be predicted for objects containing tin ?

Answer»

Transformation from white tin to GREY tin occurs changing it to a more BRITTLE form
There will be a contraction in volume observed due to the ALLOTROPIC change
The reaction will slow down after after initiation
The objects will become STRONGER

ANSWER :A
Discussion
21633.

Write the names and structures of the monomers of the following polymers : (i) Buna-S (ii) Buna-N (iii) Dacron (iv) Neoprene

Answer»

SOLUTION :
Discussion
21634.

Which one is food preservation ?

Answer»

SODIUM sulphate
Saccharin
Alitame
Sodium metabisulphite 

SOLUTION :Sodium metabisulphite
Discussion
21635.

Which is called lazy gas

Answer»

Kr
Ar
He
Ne

Answer :B
Discussion
21636.

Which of the following is a 3^@amine?

Answer»

1-methylcyclohexylamine
TRIETHYLAMINE
tert-butylamine
N-methylaniline

Solution :Triethylamine
Discussion
21637.

Which of the following metal is sometimes found native in nature

Answer»

Al
Cu
Fe
Mg

Answer :B
Discussion
21638.

Which of salt will give basic solution on hydrolysis?

Answer»

KCN
KCl
`NH_(4)CL`
`CH_(3)COONH_(4)`

SOLUTION :KCN is salt of strong base and weak ACID.
Discussion
21639.

Which of the following salt is acidic

Answer»

`Na_(2)SO_(4)`
`NaHSO_(3)`
`Na_(2)SO_(3)`
`Na_(2)S`

Solution :It contains replacable H ATOM.
Discussion
21640.

Which of the following is false ?

Answer»

Artificial SILK is derived from cellulose
Nylon-6,6is an example of elastomer
The repeat UNIT in natural RUBBER in isoprene
Both starch and cellulose are polymers of glucose

Solution :Nylon-6,6 is a FIBRE and not an elastomer.
Discussion
21641.

What type of substances are strongly attracted by magnetic field ?

Answer»

SOLUTION :FERROMAGNETIC
Discussion
21642.

Which of the following statements is not true about low density polythene ?

Answer»

Tough
Hard
Poor conductor of ELECTRICITY
HIGHLY BRANCHED structure

Solution :Low density POLYTHENE has only few branching but is not highly branched .
Discussion
21643.

WhenCH_2 = CH -O - CH_2 - CH_3 reacts with one mole of HI , one of the products formed is

Answer»

`0.693 xx 3 " M Min"^(-1)`
`0.0693 xx 4 " M min"^(-1)`
`0.0693 " M min"^(-1)`
`0.0693 xx 3 " M min"^(-1)`

SOLUTION :`underset ("Intial conc.") (12 M) overset (t_(1//2)) to6Moverset (t_(1//2))to3M `
`t_(1//2)= 10 ` min
`K = (0.693)/10 = 0.693 "min"^(-1)`
As `t_(1//2)` is 10 min , after 20 minutesthe concentrationwill be3 M .
Hence, RATE` = 0.693 xx 3 " M " min^(-1)`
Discussion
21644.

The three dimensional structure of DNA was elucidated by :

Answer»

JAMES WATSON
FRANKLIN
M.Wilkins
Dalton.

Answer :A
Discussion
21645.

Which of one the esters is formed by esterification of propan-2- ol withacetic acid ?

Answer»

`(CH_(3))_(2)CHCOOCH_(3)`
`CH_(3)COOCH(CH_(3))_(2)`
`CH_(3)CH_(2)CH_(2)COOCH_(3)`
`(CH_(3))_(2)CHCOOCH_(2)CH_(3)`

ANSWER :B
Discussion
21646.

Which of the following does not influence the chemical equilibrium of a reversible reaction?

Answer»

Temperature CHANGE
Catalyst
PRESSURE change
Increase in CONCENTRATION of reactants.

Answer :B
Discussion
21647.

Which of the following is a polysaccharide ?

Answer»

CELLULOSE
SUCROSE
GALACTOSE
MALTOSE.

ANSWER :A
Discussion
21648.

Trephthalic acid is obtained by oxidation of which of following compounds

Answer»





SOLUTION :Terepthalic acis is a para dicarboxylic ACID. HENCE (C) is the correct ANSWER.
Discussion
21649.

Which of the following compounds represents acrylonitrile

Answer»

VINYL cyanide
Cyanoethene
Prop-2-ene nitrile
All of them

Answer :D
Discussion
21650.

What is lanthanoid contraction? Write the general oxidation state of actinoids.

Answer»

Solution :The GRADUAL decrease in atomic and ionic RADII in LANTHANOID series with increase in atomic number.
Any suitable STATEMENT
The GENERAL oxidation state of Actinoid is +3.
Discussion