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16151.

Which of the following is more covalent : SbCl_(5) or SbCl_(3) ?

Answer»

Solution :HIGHER the OXIDATION state, more COVALENT is the compound, i.e., `SbCl_(5)` is more covalent than `SbCl_(3)`.
Discussion
16152.

Which of the following statements is correct ? (Atomic number ofNi = 28)

Answer»

`NI(CO)` is diamagnetic and `[NiCl_(4)]^(2-) and [Ni(CN)_(4)]^(2-)` are PARAMAGNETIC.
`Ni(CO)_(4) and [Ni(CN)_(4)]^(2-)` are diamagnetic and `[NiCl_(4)]^(2-)` is paramagnetic
`Ni(CO)_(4) and [NiCl_(4)]^(2-)` are diamagnetic and `[Ni(CN)_(4)]^(2-)` is paramagnetic
`[NiCl_(4)]^(2-) and [Ni(CN)_(4)]^(2-)` are diamagnetic and `Ni(CO)_(4)` is paramagnetic.

Solution :
Discussion
16153.

Which metal will dissolve if the cell works Cu|Cu^(2+)||Ag^+|Ag:

Answer»

Cu
Ag
Both (a) and (B)
None

Answer :A
Discussion
16154.

Which one of the following will not undergo Hofmann bromamide reaction?

Answer»

`CH_(3)CONHCH_(3)`
`CH_(3)CH_(2)CONH_(2)`
`CH_(3)CONH_(2)`
`C_(6)H_(5)CONH_(2)`

Solution :Only primary amides UNDERGO hoffmann bromamide REACTION.
Discussion
16155.

What combination of Grignand reagent and alkyl nitirle is useful to prepare butanone

Answer»

Solution :(a) `CH_(3)CN underset((II) H_(2)O)overset((i) C_(2)H_(5)MgBr)RARR CH_(3)COCH_(2)CH_(3)`
(b) `CH_(3)CH_(2)CN underset((ii)H_(2)O)overset((i) C_(2)H_(5)MgBr)rarr CH_(3)CH_(2)COCH_(3)`
Discussion
16156.

Which statement is true for reversible processes?

Answer»

It takes PLACE in a SINGLE step
Driving force is MUCH greater than opposing force
Work OBTAINED is maximum
There is no work DONE in such processes

Answer :C
Discussion
16157.

The rocky and silicious matter associatedwith an ore is called

Answer»

Slag
Mineral
Matrix of Gangue
Flux

Answer :C
Discussion
16158.

Total number of tetrahedral and octahedral voids in 0.5 mol of a compound forming hcp structure are :

Answer»

`6.022 xx 10^(23)`
`3.011 xx 10^(23)`
`9.033 xx 10^(23)`
`4.516 xx 10^(23)`

Solution :for 1 MOL of a COMPOUND, number of TETRAHEDRAL and octahedral voids = `2+1=3`
`:.` No. of voids `= 3 xx 0.5 xx 6.022 xx 10^(23)`
`= 9.033 xx 10^(23)`
Discussion
16159.

What is the number of nodes in 3d orbitals ?

Answer»

SOLUTION :For an orbital , the NUMBER of RADIAL nodes = `(N - l -1)` For , 3d ordbital n = 3 , l = 2
`therefore` the number of radial nodes = `3-2-1` = 0
Discussion
16160.

When KOH is dissolved in water, Heat is evolved. If the temperature is raised, the solubility of KOH:

Answer»

INCREASES
Decreases
Remains the same
Cannot be predicted

Answer :B
Discussion
16161.

Which of the following cations are present in the given salt mixture ?

Answer»

`PB^(2+)`
`HG^(2+)`
`AG^(+)`
`ZN^(2+)`

SOLUTION :
Discussion
16162.

Treatment of sodium salt of phenol with carbon dioxide under pressure brings about substitution of the carboxyl group, -COOH, for hydrogen of the ring. This provides a path of conversion of phenol into hydroxy carboxylic acids. The acids formed are industrially very important compounds and form many useful compounds. formed from sodium phenoxide.

Answer»

SOLUTION :CARBON DIOXIDE ACTS as an ELECTROPHILE.
Discussion
16163.

What is the correct formula for R toP reaction rate?

Answer»

<P>`(Delta[R])/(t)=(-Delta[P])/(t)`
`(-Delta[R])/(DELTAT)=(Delta[P])/(Deltat)`
`(-[R])/(t)=(Delta[P])/(Deltat)`
`(-Delta[R])/(Deltat)=(Deltat)/(Delta[P])`

ANSWER :B
Discussion
16164.

Which of the following is/are correct about[Cu(NH_(3))_(4)]SO_(4) :

Answer»

It is a Tetrahedral complex
It is paramagentic with one UNPAIRED ELECTRON in the d-subshell
It gives WHITE precipitate with `BaCl_(2)`
Its aqueous solution does not conduct electricity.

Solution :In `[CU(NH_(3))_(4)]SO_(4)` complex one unpaired electron present in `P_(Z)`orbital
Hybridisation `= dsp^(2)` , square planner
`BaCl_(2) +SO_(4)^(2-) to BaSO_(4)` complex
Discussion
16165.

Which of the following is not a nitro derivatives?

Answer»

`C_6H_5-NO_2`

`CH_3-UNDERSET(O)underset(DARR)N=O`
`CH_3CH_2-O-N=O`

ANSWER :4
Discussion
16166.

While moving down a group in the periodic table, the size of the atom generally:

Answer»

decreases
increases
remains constant
FIRST increaaes for first THREE ELEMENTS and then decreases

Answer :B
Discussion
16167.

The structure of IF_(7) is

Answer»

trigonal BIPYRAMID
octahedral
pentagonal bipyramid
SQUARE pyramid

SOLUTION :Pentagonal bipyramid.
Discussion
16168.

What products are obtained dry distillation of a mixture of (CH_(3)COO)_(2) and (C_(3)CH_(2)COO)_(2)Ca?

Answer»

Solution :The PRODUCTS obtained are `CH_(3)COCH_(3), CH_(3)CH_(2)OCH_(2)CH_(3) and CH_(3)COCH_(2)CH_(3)`
Discussion
16169.

Which one of the following pairs of ions have the same electronic configuration ?

Answer»

`CR^(3+), FE^(3+)`
`Fe^(3+), Co^(3+)`
`Fe^(3+), MN^(2+)`
`Sc^(3+), Cr^(3+)`

ANSWER :B
Discussion
16170.

Which of the following compound will gives smell of NH_(3)with conc.NaOH ?

Answer»

`CH_(3)-CH_(2)-underset(O)underset(||)(C )-NH_(2)`
`CH_(3)-underset(O)underset(||)(C )-CH_(2)-NH_(2)`

`CH_(3)-CH_(2)-underset(O)underset(||)(C )-OH`

SOLUTION :N//A
Discussion
16171.

underset(CH)overset(CH)(|||) reacts with acetic acid in presence of Hg^(2+) to give

Answer»

`oversetoverset(CH_3)|CH(CH_3COO)_2`
`{:(CH(CH_3COO)_2),(|),(CH(CH_3COO)_2):}`
`oversetoverset(CH_3)|CH_2(CH_3COO)`
None of these

Solution :Reaction of acetic acid with acetylene is catalysed by `HG^(2+)` SALT
`HC-=CHunderset(Hg(OOC CH_3)_2)overset(CH_3COOH)to UNDERSET"vinyl acetate"(CH_2=CHOOC CH_3) underset(Hg(OOC CH_3)_2)overset(CH_3COOH)tounderset"ethylidene diacetate"(CH_3-CH(OO C CH_3)_2)`
Discussion
16172.

Which one of the following the graph between "log" p (on Y-axis) and 1/T (on X-axis)? (p=vapour pressure of a liquid,T=Absolute temprature)

Answer»

<P>


SOLUTION :According to the clasius and clapeyron. A straight line with a NEGATIVE SLOPE is obtained, if a graph is plotted between `""LOG""p and !/T` on Y-axis and X-axis respectively.
Discussion
16173.

Which of the following is most easily oxidised ?

Answer»

`[Co(CN)_(6)]^(4-)`
`[Co(NO_(2))_(6)]^(3-)`
`[Co(NH_(3))_(6)]^(2+)`
`[Co(en)_(3)]^(2+)`

Solution :`[Co(CN)_(6)]^(4-):Co^(2+):3D^(7)`

`overset(Ө)CN` is strong FIELD ligand among all GIVEN ligands hence `[Co(CN)_(6)]^(4-)` is easily oxidised into `[Co(CN)_(6)]^(3-)`.
Discussion
16174.

The reactivity order of halides for dehydrohalogenation is

Answer»

R-FgtR-ClgtR-BrgtR-I
R-IgtR-BrgtR-ClgtR-F
R-IgtR-ClgtR-BrgtR-F
R-FgtR-IgtR-BrgtR-Cl

Answer :B
Discussion
16175.

Which of the following is observed in ethylene molecule

Answer»

ELECTROMERIC effect
Inductive effect
Homolytic fission
None of these

Solution :
Discussion
16176.

What will be the product for the following reaction acetylchoride overset((i) CH_(3)MgBr) underset((ii) H_(3)O^(+)) to X overset("acid" K_(2)Cr_(2)O_(7)) to A. Identify X and A

Answer»

Solution :
X- `CH_(3)COCH_(3)`- ACETONE
A- `CH_(3)COOH` - Acetic Acid
Discussion
16177.

Write the structure and IUPAC name of glycerol.

Answer»

Solution :`UNDERSET("Propane-1, 2, 3- triol")(underset(OH)underset("|")(CH_(2))-underset(OH)underset("|")"CH"-underset(OH)underset("|")(CH_(2)))`
Discussion
16178.

Vitamin C is called :

Answer»

antiscurvy
ANTIRACHITIC
antisterility
antioxidant.

Answer :A
Discussion
16179.

The relative basic character of the following is

Answer»

`CIO^(-) lt CIO_(2)^(-) lt CIO_(3)^(-) lt CIO_(4)^(-)`
`CIO_(4)^(-) lt CIO_(3)^(-) lt CIO_(2)^(-) lt CIO^(-)`
`CIO_(3)^(-) lt CIO_(4)^(-) lt CIO_(2)^(-) lt CIO^(-)`
`CIO_(2)^(-) lt CIO^(-) lt CIO_(3)^(-) lt CIO_(4)^(-)`

Answer :B
Discussion
16180.

Write the structural formula and IUPAC names of all possible isomers of the compound with molecular formula C_(3)H_(8)O. Write 'two' uses of phenol. What happens when glucose is treated with : (a) Bromine water (b) dilute nitric acid (c) Hydrogen cyanide (HCN)

Answer»

Solution :Osomers of the COMPOUND with molecular formula `C_(3)H_(8)O` are
(a) `CH_(3)CH_(2)CH_(2)-OH`
IUPAC Name : 1-propanol
(b) `H_(3)C-underset(OH)underset(|)OVERSET(H)overset(|)(C)-CH_(3)`
IUPAC Name : 2- propanol
(c) `H_(3)C-O-C_(2)H_(5)`
IUPAC Name : Methoxy ethane
Uses of PHENOL : (1) Phenol is used as an antiseptic for surgical instruments, as an oral analgesic, in the procuction of drugs, in COSMETICS and to embalm bodies.
(2) Phenol formaldehyde adhesives are generally hot press adhesives used extensively in the manufacture of plywood and other wood products such as flakeboard, oriented strand board etc.
(c) When glucose is treated with hydrogen cyanide (HCN), glucose cyanohydrin is formed
`{:(CHO,,CN,),("|",HCN,"|",),((CHOH)_(4),to,CH-OH,),("|",,"|",),(CH_(2)OH,,(CHOH)_(4),),("Glucose",,"|",),(,,CH_(2)OH,),(,,"Glucose Cyanohydrin",):}`
Discussion
16181.

Which of the following is most suitable ?

Answer»

`Bi_(2) S_(3) ( K_(sp) = 1 xx 10^(-17))`
`MnS ( K_(sp ) = 7 xx 10^(-16))`
`CUS ( K_(sp ) = 8 xx 10^(- 37))`
`Ag_(2) S ( K_(sp) = 6 xx 10^(-51))`

Answer :B
Discussion
16182.

Which ion in aqueous medium has orange colour?

Answer»

`Cr_2O_7^(2-)`
`CR^(3+)`
`MnO_4^-`
`MnO_4^(2-)`

ANSWER :A
Discussion
16183.

Which of the following is used as an oxidising agent In hybrid fuel

Answer»

`H_(2)O_(2)`
`Cr_(2)O_(3)`
`N_(2)O_(4)`
`CrO_(3)`

Solution :HYBRID fuel CONSISTS of solid fuel (e.g. ACRYLIC rubber) and a liquid oxidiser (e.g. `N_(2)O_(4)`).
Discussion
16184.

The salt bridge used in Daniel cell contains ______ .

Answer»

`Na_(2)SO_(4)+NaCl`
Agar-Agar GEL + `Na_(2)SO_(4)`
Silica gel + `CuSO_(4)`
`ZnSO_(4)+CuSO_(4)`

SOLUTION :Agar-Agar gel + `Na_(2)SO_(4)`
Discussion
16185.

Write the structure of 4-chloropentan-2-one.

Answer»

SOLUTION :`CH_(3)-underset(Cl)underset(|)(CH)-CH_(2)-OVERSET(O)overset(||)(C)-CH_(3)`
Discussion
16186.

Which of the following is Colin's reagent ?

Answer»

pyridine
CHROMIUM OXIDE
pyridinium chlorochromate
`KOH+ KMnO_(4)`

ANSWER :C
Discussion
16187.

When treated with ammoniacal cuprous chloride, which one among the following forms copper derivative

Answer»

`C_2H_6`
`C_2H_4`
`C_2H_2`
`C_6H_6`

Solution :`2NH_4OH + Cu_2Cl_2 to 2CuOH + 2NH_4Cl`
`NH_4OH+CuOH to underset"Diammine COPPER (I)hydroxide"([Cu(NH_3)_2])OH`
`2[Cu(NH_3)_2]OH + HC -=CH to underset"copperacetylide (RED ppt.)"(Cu-C-=C-Cu)+4NH_3+2H_2O`
Discussion
16188.

Which of the following will form Ph-NH-underset(O)underset("||")C-CH_(3)on reaction with aniline ?

Answer»

`CH_(3)-UNDERSET(O)underset("||")C-Cl`


ANSWER :A::B::D
Discussion
16189.

Which one amongst of the following isomerism is shown by [Pt(NH_3)_2Cl_(20)]?

Answer»

Structrual
GEOMETRICAL
OPTICAL
CONFORMATIONAL

ANSWER :B
Discussion
16190.

Valence shell electron pair repusin theory (VSEPR) can be used to perdict the approximate shape of molecules. Electrons in bonds and in lone pairs can ve thought of as "charge cloud" that repel one another and stay as far apart possible, thus causing molecules to assume specific shapes. The repulsive interacions of electro paris decrease in the order : Lone pair-lone pair gt Lone pair -bond pair gt Bond pair -bond pair. These repulsions effect result in deviations from idealized shapes and ateration in bond angles in molecules Which of the following is linear ?

Answer»

`I_(3^(-))`
`ICl_(2^(+))`
`HgCl_(2)`
`XeF_(2)`

SOLUTION :N//A
Discussion
16191.

The valency of an element depends upon the

Answer»

total number of protons in an atom
mass number of an atom
total number of NEUTRONS is an atom
total number of ELECTRONS in the outer most shell of an atom

Solution :Valency is themeasure of the combiningcapacityofatoms of molecules. Thereforeit isthe capacityofanatom of asingleelementtoreactandcombinewithelectronsnumbersof ATOMSOF anotherelement . Theelectrons PRESENTIN theoutermostshell`//`ORBIT of an atom are calledvalence electrons. The valenceelectronstakepart inanychemicalreactionbecausetheoutermostorbitusuallycontainsmoreenergythan theoutermostorbitusually containsmore energythantheelectronspresentin otherorbits . the valencyof an elementdepends uponthe totalnumberof electrons in theoutermostshell of anatom.
Discussion
16192.

Which of the following compounds will absorb the maximum quantity of heat when dissolved in same amount of water ? The heats of solution of these compounds at 25^(@)C in kJ/mole of each solute is given in brackets

Answer»

`HNO_(3)(DELTA H=-33)`
`KCL (Delta H = +17.64)`
`NH_(4)NO_(3)(Delta H =-25.50)`
`HCl (Delta H =- 74.11)`

ANSWER :B
Discussion
16193.

Which of the following element does not react with oxygen directly ?

Answer»

Zn
Ti
Pt
Fe

Answer :C
Discussion
16194.

Which type of cell are rechargeable?

Answer»

Solution :Those cells are rechargeable in which the products during DISCHARGE are diposited on the electrodes and these can be DECOMPOSED to GIVE the original substances when electrical ENERGY is supplied.
Discussion
16195.

Which of the following compound is optically inactive ?

Answer»

LACTIC ACID
Propanoic acid
GLYCERALDEHYDE
Glucose

Answer :B
Discussion
16196.

What is vapour phase nitration ?

Answer»

Solution :Reaction of alkanes with nitric ACID in vapour phase to FORM nitroalkanes is called vapour phase nitration.
`R-X+NaNO_2 rarr R-O-N = O + NAX`
Discussion
16197.

Which of the following are examples of synthetic rubber ?

Answer»

Polychloroprene
POLYACRYLONITRILE
Buna -N
CIS -Polyioprene

ANSWER :A::C
Discussion
16198.

The scattering of light on the surface of colloidal particle is _____.

Answer»

SOLUTION :TYNDAL EFFECT.
Discussion
16199.

Which among the following factors is the most important in making fluorine oxidizing halogen?

Answer»

ionization enthalpy
hydration enthalpy
electron AFFINITY
BOND dissociation ENERGY

ANSWER :B
Discussion
16200.

The store house for all biological information is :

Answer»

RNA
m-RNA
DNA
None of the above

Answer :C
Discussion