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7851.

Write the structure of an organic compound which reacts with water to yield methanal and hydrogen peroxide.

Answer»

SOLUTION :
Discussion
7852.

Write the chemical method by with Fe(OH)_(3) sol is prepared from FeCl_(3).

Answer»

SOLUTION :By BOILING AQUEOUS solution of `FeCl_(3),`
Discussion
7853.

Which is cyclic phosphate?

Answer»

`H_5P_33O_10`
`H_6P_4O_13`
`H_5P_5O_15`
`H_7P_5O_16`

ANSWER :C
Discussion
7854.

Which of the following organic compound undergoes Cannizzaro's reaction? : CH_3CHO

Answer»

`CH_(3)CHO`
`CH_(3)CH_(2)CHO`
HCHO
`(CH_(3))_(2)CHCHO`

Answer :C
Discussion
7855.

Which product will form when optically active form of C_4 H_9 Br is subjected to dehydrohalogenation?

Answer»

SOLUTION :The optically active form of `C_(4)H_(9)BR " is " CH_(3)CH_(2)CHBrC_(3)`. 2-Bromobutane on dehydrohalogenation gives 2-butene according to Saytzeff rule.
`CH_(3)CH_(2)CHBrCH_(3) UNDERSET(KOH)overset("alcoholic")RARR CH_(3)CH=CHCH_(3) + KBr + H_(2)O`
Discussion
7856.

Write the name or structure of the compounds A and B in the following reactions.

Answer»

SOLUTION :
Discussion
7857.

Which elements has a limited co-ordination number of four?

Answer»

Sn
C
Si
Ge

Answer :B
Discussion
7858.

Which of the following hybrides of 16th group generally does not act as a reducing agent ?

Answer»

`H_2O`
`H_2S`
`H_2Se`
`H_2Te`

ANSWER :A
Discussion
7859.

Write the molecular formula and structuralformula for the following molecules. (a) Nitric acid (b) dinitrogen pentoxide (c) phosphoric acid (d) phosphine

Answer»

SOLUTION :
Discussion
7860.

When carbon monoxide is passed over solid caustic soda heated to 200^@C, it forms:

Answer»

`Na_2CO_3`
`NaHCO_3`
HCOONa
None of these

Answer :C
Discussion
7861.

The standard oxidation potential of Zn and Ag in water at 25^(@)C are : Zn(s) toZn^(2+)(aq)+2e^(-), E^(@)=+0.76" V " Ag(s) to Ag^(+)(aq)+e^(-), E^(@)=-0.80" V ". Which of the following reaction will initially take place ?

Answer»

`ZN^(2+)(aq)+Ag^(+)(aq) to Zn(s) +Ag(s)`
`Zn(s)+2AG(s) to 2ZN^(2+)(aq)+Ag^(+)(aq)`
`Zn(s)+2Ag^(+)(aq) to Zn^(2+)(aq)+2Ag(s)`
`Zn^(2+)(aq)+2Ag(s) to 2A^(+)(aq)+Zn(s)`

SOLUTION :(c ) In this reaction, Zn (s) is oxidised to `Zn^(2+)` (aq) IONS and `Ag^(+)` (aq) ions are reduced to Ag (s).
Discussion
7862.

Which of the following has largest number of isomers?

Answer»

`[CO(en)_(2)Cl_(2)]^(+)`
`[Co(NH_(3))_(5)Cl]^(2+)`
`[Ir(PR_(3))_(2)H(CO)]^(2+)`
`[Ru(NH_(3))_(4)Cl_(2)]^(+)`

ANSWER :A
Discussion
7863.

Which of the following chlorides is explosive?

Answer»

`PCl_(3)`
`AsCl_(3)`.
`SbCl_(3)`
`NCl_(3)`.

ANSWER :D
Discussion
7864.

Write two uses of acetaldehyde.

Answer»

Solution :(i) Used as an ANTISEPTIC.
(ii) Used for MANUFACTURE of ETHANOL and ethanoic ACID.
Discussion
7865.

The volume of 0.05N Na_2CO_3solution required to neutralise 200ml of 0.02M H_2SO_4solution is

Answer»

80 ML
140 ml
160 ml
240 ml

ANSWER :C
Discussion
7866.

What sequence of reactions would best accomplish the following conversion? CH_(3)-overset(O)overset(||)C-CH_(2)-overset(O)overset(||)C-Hoverset(?)rarrCH_(3)overset(OH)overset("|")"CH"CH_(2)CHO

Answer»

`NaBH_(4)//H_(3)O^(+)`
`HOCH_(2)CH_(2)OH//H^(+), NaBH_(4), H^(+)//H_(2)O`
`KMnO_(4)//HO^(-)," HEAT"`
`LiAlH_(4)//H_(3)O^(+)`

Answer :B
Discussion
7867.

Which is used in preparation of portland cement:

Answer»

LIMESTONE, CLAY and sand
Limestone ,GYPSUM and sand
Limestone, gypsum and alumina
Limestone, clay and gypsum

Answer :D
Discussion
7868.

Which of the following will react with Br_2 most readily ?

Answer»

`CH_2=CH_2`
`CH_3CH=CH_2`
`CH_3CH = CHCH_3`
`(CH_3)_2 C = C (CH_3)_2`

ANSWER :D
Discussion
7869.

What type of bonding occurs in globular proteins ?

Answer»

SOLUTION :van der WALLS interactions , disulphide BRIDGES , dipolar interactions (ionic) and HYDROGEN BONDING.
Discussion
7870.

Yellow colour of usual nitric acid is due to the presence of :

Answer»

`NO_(2)`
`NO`
`N_(2)O`
`N_(2)O_(5)`

ANSWER :A
Discussion
7871.

Which of the following pair has elements containing same number of electrons in the outermost orbit

Answer»

N , O
Na , Ca
As , Bi
Pb , Sb

Solution :Both belongs to VA GROUP.
Discussion
7872.

Which of the following represents chemisorption ? (x = The mass of the absorbate, m = Mass of the adsorbent)

Answer»

a,B,d
a,C
b,d
b,c,d

ANSWER :C
Discussion
7873.

When E_(Ag^(+) | Ag)^@ = 0.80volt and E_(Zn^(2+)|Zn)^@ = 0.76 volt, which of the following is correct?

Answer»

`Ag^+` can be REDUCED by `H_2`
Ag can OXIDISE `H_2` into `H^+` ion
`Zn^(+2)` can be reduced by `H_2`
Ag can REDUCE `Zn^(+2)` ion

Answer :A
Discussion
7874.

Which is incorrectly matched for refining of element?

Answer»

SI, Ge from impuritie` implies` zone refining method
Sn refined from `SnO_(2) implies`poling method
Zn,Cd from impurities with HIGH boiling point `implies`liquation
Al from impurities Cu, Fe `implies` HOOP method

Answer :3
Discussion
7875.

What is coupling of reaction ? How is it useful in metallurgy ?

Answer»

Solution :(i) If VALUE of `Delta G` is POSITIVE for any reaction, them to make such reaction spontaneous, it is COUPLED with another reaction of large negative `Delta G` value, so that the SUM of two `Delta G` become negative. This is known as coupling of reaction.
(ii) In the metallurgy, thermodynamically INFEASIBLE reaction is coupled with a reaction which has more negative `Delta G`, so that net `Delta G` becomes negative.
Discussion
7876.

The salt of strong acid and strong base not undergo hydrolysis . Explain .

Answer»

SOLUTION :(i) In this case , neither the CATIONS nor the anions undergo hydrolysis. Therefore the solution remains NEUTRAL.
(ii) For example , in the aqueous solution of NaCI , its ions `Na^+ and CI^-`ions have no TENDENCY to react with `H^+ "or"OH^(-)` ions of water . This is because the possible products of such reaction are NaOH and HCI Which are completely dissociated As a result, there, there is no change in the concentration of `H^+and OH^-`ions and HENCE the solution continues to remain neutral .
Discussion
7877.

Which of the following orders is correct for the size ? (1)Mg^(2+)ltNa^(+)ltF^(-)ltAl (2)Al^(3+)ltMg^(2+)ltLi^(+)ltK^(+) (3)Fe^(4+)ltFe^(3+)ltFe^(2+)ltFe (4)MggtAlgtSigtP

Answer»

(1),(2)&(3)
(2),(3) & (4)
(1),(3) & (5)
(1),(2),(3) & (4)

Solution :(1)`Mg^(2+),Na^(+) and F^(-)` are isoelectronic and thus follows the order `._12 Mg^(2+) lt ._(11)Na^(+) lt ._9F^(-)`
All belongs to third period and has no charge so itis largest.
`Na^(+)=102` pm , `Mg^(2+)` =72 pm, Al=143 pm, `F^-`=133 pm.
(2)`K^+` has more number of shells than `Mg^(2+)` and `Al^(3+)` .`Al^(3-)` and `Mg^(2+)` are isoelectronic but `Al^(3+)` has HIGHER nuclear charge so `Al^(3+) lt Mg^(2+) . Mg^(2+)` and `Li^(+)` has diagonal relationship.But due to +2 charge to +2 charge in `Mg^(2+)` , the `Mg^(2+)` is smaller than `Li^(+)`.Hence `Al^(3+)` is the smallest one.
`K^(+)=1.38Å, Li^(2+)=0.76 Å, Mg^(2+)=0.72 Å, Al^(3+)=0.535 Å`
(3)As the number of electrons are lost , the attraction between valence shell electrons and nucleus increases As a consequence of this the electrons are pulled CLOSER to the nucleus leading to the contraction in size of ions.
(4)Across the period the nuclear charge increases and thus the size of atoms decreases, Mg=160 pm, Al=143 pm , Si=118 , P=110 pm
Discussion
7878.

Which will adsorb more gas, a lump of charcoal or its powder and why ?

Answer»

SOLUTION :Powdered CHARCOAL will adsorb more GAS because of its LARGER surface AREA than a lump of charcoal.
Discussion
7879.

Which species does not exist ?

Answer»

`[SnCl_6]^(2-)`
`[GeCl_6]^(2-)`
`[SiCl_6]^(2-)`
`[C Cl_6]^(2-)`

ANSWER :D
Discussion
7880.

The single electron in 2p-orbitals of nitrogen atom proves:

Answer»

HUND's rule
Pauli's rule
Aufbau principle
None of the above

Answer :A
Discussion
7881.

The volume of decamolar aquous solutions of hydrochloric acid is required to prepare 2"dm"^3 of 5M HCl solution is

Answer»

0.5L
1L
2L
3L

Answer :B
Discussion
7882.

Which of the following is not correct about xenon hexafluoride?

Answer»

It has OXIDATION state of +6
The hybridisation involved in `XeF_6` is `sp^3d^3`.
The SHAPE of `XeF_6` is DISTORTED octahedral and can be represented as

On hydrolysis it gives Xe, HF and `O_2`

SOLUTION :On hydrolysis the products formed are `XeO_3` and HF
`XeF_6 + 3H_2O to XeO_3 + 6HF`
Discussion
7883.

Which is the product when phenol is oxidised with chromic acid (Na_(2)Cr_(2)O_(7) + Conc. H_(2)SO_(4)) ?

Answer»

1, 4 benzoquinon
Resorcinol
Benzoyl CHLORIDE
HYDRO qunine

Solution :
Discussion
7884.

The standard Hydrogen electrode in which the inert metal used is

Answer»

Pb
PD
Pt
NI

Solution :Pt in an INERT metal .
Discussion
7885.

When tetramethyl ammonium hydroxide is heated strongly, it yields methanol and trimethylamine . How is methanol formed : To what general calss of reaction does this belong ?

Answer»

SOLUTION :This is by ` E2` eleimination
`[CH_(3)-overset(CH_(3))overset(|)underset(CH_(3))underset(|)(.^(o+N))-CH_(3)]overset(Theta)OH overset(Delta)rarr CH_(3)OH+Me-overset(Me)overset(|)(N)-Me`
If one or more groups other than ` CH_3` are present , then alkene will be formed (less substiuted , Hofmann rule ) INSTEAD of ` CH_3OH`.
Discussion
7886.

To a mixture of acetic acid and sodium acetate a further amount of sodium acetate is added. The pH of the mixture:

Answer»

Increases
Decreases
Remains unchanged
Not predictable

Answer :A
Discussion
7887.

Vitamin E is known as :

Answer»

ADENINE
RIBOFLAVIN
ASCORBIC ACID
tocopherol.

Answer :D
Discussion
7888.

Which of the following pairs has the same bond angle

Answer»

ETHANE and ETHYLENE
Ethylene and acetylene
Ethylene and BENZENE
Acetylene and benzene

Solution :`{:("Ethylene and Benzene",),(120^@,120^@),(sp^2 " " sp^2,):}`
Discussion
7889.

The value of 'spin only' magnetic moment for one of the following configurations is 2.84 BM. The correct one is :

Answer»

`d^(4)` (in strong liquid field)
`d^(2)` (in weak LIGAND field)
`d^(3)` (in weak as well ASIN strong fields)
`d^(5)` (in strong ligand field).

SOLUTION :`mu=2.84BM`
This is possible only if n = 2 in the formula :
`mu=SQRT(n(n+2))=sqrt(2(2+2))=2.84`
Two unpaired electrons are possible in strong field octahedral `d^(4)` system : `t_(2g)^(3)e_(g)^(1)`
Discussion
7890.

Which of the following complexes does not obey EAN rule ?

Answer»

`Cr(CO)_(6)`
`[Fe(CN)_(6)]^(4-)`
`[Cr(NH_(3))_(6)]^(3+)`
`[NI(CO)_(4)]`.

Solution :`(A) EAN=24+12=36`,
`(B)EAN=24+12=36`
`(C )EAN=21+12=33`
`(D)EAN=28+8=36`
For `[Cr(NH_(3))_(6)]^(3+)` EAN RULE is not obeyed.
Discussion
7891.

Which one of the following elements is not found in proteins ?

Answer»

N
F
C
O

Answer :B
Discussion
7892.

TiI_(4) on heating gives

Answer»

`TiI_(2)+I_(2)`
`Ti+2I_(2)`
`TiI_(3)+1/2I_(2)`
None of these

Solution :`Til_(4)` on heating GIVES titanium and iodine. Ity is the van Arkel method for the PRODUCTION of pure Ti.
`Ti_(4)OVERSET("Heat")toTi+2I_(2)`
Discussion
7893.

Which amine in each of the following pairs is a stronger base? Give reasons. CH_3underset(NH_2) underset(|) (CH ) -CH_3orCH_3 - underset(NH_2) underset(|) (CH ) - COOCH_3

Answer»

SOLUTION :`CH_3underset(NH_2 ) UNDERSET(|) (CH) -CH_3`
Discussion
7894.

The total kinetic energy of a sample of gas which contians N molecules at -123^(@)C has E_(K) joules. Another sample of gas at 27^(@)C has totla kinetic energy of 2 E_(K) joules. The number of molecules in the second sample of gas is :

Answer»

`N//2`
`2N`
N
`N^(2)`

ANSWER :C
Discussion
7895.

Which of the following compelxes would exhibit both geometrical as well as optical isomerism?

Answer»

`[PT("ox")_(2)(NH_(3))_(2)]`
`[Zn(gly)_(2)]`
`[Pt(gly)_(2)]`
`[Co(gly)_(3)]`

Solution :(B) shows optical only while (C ) shows geometrical only.
Discussion
7896.

What is addition polymer ? Give example .

Answer»

SOLUTION :Addition polymer: The polymer which is FORMED by the addition of molecules of MONOMERS of same type (or) different type containing double bonds is called addition polymers .
E.g. polythene ,POLY acrylonitrile.
Discussion
7897.

Write the IUPAC name of the complex [Cr(NH_(3))_(4)Cl_(2)]^(+).

Answer»

Solution :IUPAC NAME of `[Cr(NH_(3))_(4)Cl_(2)]^(+)` is Tetraamminedichloridochromium(III) ion.
Discussion
7898.

Which one of the following is formed apart from sodium chloride when chlorine reacts with hot concentrated sodium hydroxide?

Answer»

`NACLO`
`NaClO_(2)`
`NaClO_(3)`
`NaClO_(4)`

Answer :C
Discussion
7899.

Which compound of phosphorus act as a ligands ?

Answer»

`PCl_(3)`
`P(C_(2)H_(5))_(3)`
`PCl_(5)`
`POCl_(3)`

SOLUTION :Phosphorus and arsenic elements form `d_(pi) -p_(pi)`bonds with TRANSITION METAL elements in such compounds of phosphorous `P(C_2H_5)_3` acts as ligand.
Discussion
7900.

Write the structure of the major organic product in each of the following reactions :(CH_(3))_(3)CBr+KOH overset(" ethanol ")underset(" heat ")rarr

Answer»

Solution :`CH_(3)-UNDERSET(CH_(3))underset("|")("C ")=CH_(2)`
Discussion