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17251.

When KOH solution is added to pottasium dichromate solution the colur of solution changes to yellow, because:

Answer»


ANSWER :B
Discussion
17252.

What would be the molar mass of compound if 6.21 g of it is dissolved in 24.0 g of CH Cl_(3) from a solution that has a boiling point of 68.04^(@)C. The boiling point of pure chloroform is 61.7^(@)C and the boiling point elevation constant Kb for chloroform is 3.63^(@)C/m.

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Solution :Elevation in boiling point `DeltaT_(b) = 68.04 - 61.7 = 6.31 ^(@) C`
Mass of substance `W_(B) = 6.21` g
Mass of `CH Cl_(3) W_(A) = 24.0` g
`K_B = 3.63 ""^(@) C//m`
`M_(B) = (K_(b) xx W_(B) xx 1000)/(DeltaT_(b) xx W_(A)) = (3.63 xx 6.21 xx 1000)/(6.34 xx 24)`
Discussion
17253.

What is essentially the difference between alpha-form of glucose and beta-form of glucose ? Explain.

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Solution :`ALPHA-`form of glucose and `beta`-form of glucose differ only in the configuration of the hydroxyl group at `C_(1)` in cyclic STRUCTURE of glucose/hemiacetal form of glucose.
Discussion
17254.

Which has the least anion to cation size ratio ?

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LiF
NaF
CsF
CsF

Answer :D
Discussion
17255.

Which one of the following statements related to lanthanons is incorrect ?

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All the lanthanons are much more reactive than aluminium
`Ce(+4)` solutions are widelyused as oxidizing agent in volumetric analysis
Europium SHOWS `+2` oxidation state
The basicity decreases as the ionic radius decreases from Pr to Lu.

Solution :(a) Lnathnons are less reactivethan aluminium due tohigh IP ( Lanthanoid contraction)
(B) `Ce^(+4)` is good oxidizing agent and easily converted into `Ce^(+3)`
(c ) Eu ( 63) `= 4f^(7) 5d^(0)6s^(2) ,Eu^(+2)= 4f^(7)`
(d) In lanthanoids series 'Ce' to 'Lu' ionic radius REGULARLY decreases and covalent character increases and hence BASIC character of hydroxides decreses.
Discussion
17256.

Which of the followingis most reactive towards H_(2)

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`CI_(2)`
`F_(2)`
`Br_(2)`
`I_(2)`

Answer :B
Discussion
17257.

What is the difference between an ambidenate ligand and a chelating ligand?

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Solution :Ambidentate ligand: Ligands with has two different donor atoms and links to the metal ION through EITHER of them is called ambidenate ligand. For example `NO_2^(-) and SCN^(-)` .
Chelating ligand: When a di- or polydenate ligand uses its two or more donor atoms simultaneously to BIND to a single metal ion, it is called a chelating ligand.
For example: oxalate ion, ETHANE -1,2- DIAMINE.
Discussion
17258.

What is collodion ?

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Solution :Collodion is a `4%` solution of NITROCELLULOSE in a mixture of ALCOHOL and ether.
Discussion
17259.

The shape of [Cu(NH_3)_4]SO_4 is :-

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SQUARE PLANAR
PYRAMIDAL
Octahedral
Tetrahedral

ANSWER :A
Discussion
17260.

Which of the following statement(s) is/are common between roasting and sintering

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Both require heating of the ore.
Both involve burning away of organic matter.
Both the process cause partial FUSION of ore, RESULTING in bigger lumps.
Both are performed only for sulphide ores.

Answer :A::B
Discussion
17261.

When H_2Sis passed through the HCl solution containing CuCl_2, HgCl_2, BiCl_3and CoCl_2. It does not precipitate out :

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CUS
HGS
`Bi_2S_3`
`COS `

ANSWER :D
Discussion
17262.

What type isomerism is shown by the complex [Co(NH_(3))_(5)NO_(2)]Cl_(2) ?

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SOLUTION :LINKAGE ISOMERISM.
Discussion
17263.

Which will undergo S_(N^(2)) reaction faster

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SOLUTION :ORDEROF `S_(N^(2))` reactivity is `1^(@) gt 2^(@) gt 3^(@)`
Discussion
17264.

Which trivalent cation is largest in lanthanoid series ?

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SOLUTION :`LA^(3+)` has the LARGEST SIZE.
Discussion
17265.

Vapour pressure of a solvent is 17.5 mmHg while that of itsdilute solution is 17.45. The mole fraction of the solvent is

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`0.997`
`0.075`
`17.48`
`1.05`

ANSWER :A
Discussion
17266.

What is the action of hydrogen cyanide onAcetone?

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Solution :ACTION of HCN on acetaone : When acetone is TREATED with HYDROGEN cyanide, acetone cyanohydrin is formed.
`UNDERSET("acetone")(CH_(3)-overset(CH_(3))overset(|)C=O) +HCN overset(OH^(-)) to underset("acetone cynohydrin") (CH_(3) - underset(CN)underset(|)overset(CH_(3))overset(|)C-OH)`
Discussion
17267.

Which one is used in the manufacture of mirror

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RED lead (LITHARGE)
AMMONIACAL `AgNO_(3)`
Ammoniacal `AgNO_(3)+` Red lead
Ammoniacal `AgNO_(3)+ HCHO`

ANSWER :D
Discussion
17268.

Which of the following reagent is used to separate the impurity from red bauxite

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Conc. HCl
`H_(2)SO_(4)`
NAOH
`HNO_(3)`

Answer :C
Discussion
17269.

The reagent which may be used to distinguish between cane sugar and glucose solution is

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MOLISCH’s reagent
Iodine solution
Baeyer’s reagent
Fehling’s solution

Answer :D
Discussion
17270.

Which of the following compound does not follow Markownikoff's law?

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`CH_3CH=CH_2`
`CH_3CHCl_2`
`CH_3CH=CHCH_3`
NONE of the above

Answer :C
Discussion
17271.

What is the expression for rate constant for 1st order reaction ?

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SOLUTION :RATE CONSTANT, `K=(2.303)/t(LOG)a/(a-x)`
Discussion
17272.

What will be the pH value of 0.05 M Ba(OH)_(2) solution

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12
13
1
12.96

Solution : `{:(Ba(OH)_(2),rarr,Ba^(+2)+,2OH^(-)),(,,0.05 M,2 xx 0.5 M):}`
`POH = LOG.(1)/([OH^(-)]) = log.(1)/(0.1) = 1`
`pH = pOH = 14 , pH + 1 = 14, pH = 14 -1 = 13`.
Discussion
17273.

Which element does not show allotropy?

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N
P
Bi
As

Answer :C
Discussion
17274.

Write Reimer Tiemann reaction giving an example.

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SOLUTION :
Discussion
17275.

Which of the following cannot show linkage isomerism?

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 `NO_(2)^(-)`
`SCN_(-)`
`CN^(-)`
)`NH_(3)`

Solution :`N_(3)` cannot SHOW linkage isomerism, it does not CONTAIN TWO donor atoms. HENCE, (D) is the correct answer.
Discussion
17276.

Which statement about the reaction of 1-bromobutane and NH_(3) is correct?

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The reaction INITIALLY GIVES a primary amine
The reaction specifically gives a primary amine
The reaction is a nucleophilic substitution
The reaction may lead to the formation of a quaternary ammonium salt.

Solution :`CH_(3)-CH_(2)-CH_(2)-CH_(2)-Br+NH_(3)toCH_(3)(CH_(2))_(2)-CH_(2)-NH_(2)overset(R-X(EX))to4^(@)` SALTS
Discussion
17277.

Water gas cannot be prepared by a continuous process because:

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More coke must be added from time to time
The furnace must be ALLOWED to cool occasionally
It cannot be MANUFACTURED without producer gas
The reaction CEASES when coke is too cool

Answer :D
Discussion
17278.

Which one of the following is a natural polymer?

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CELLULOSE, SILK
PVC, Polythene
Buna-N, Buna-S
BAKELITE, NYLON 6,6

Solution :cellulose, silk
Discussion
17279.

The type of hybrid orbitals used by the chlorine atom in ClO_(2)^(-) ion is :

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`SP^(3)` hybridisation
`sp^(2)`
`sp`
NONE of these.

Answer :B
Discussion
17280.

When ethyl amineis treatedwithacetylchlorideforms ?

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`C_(2)H_(5)NH`
`C_(2)H_(5)CHO`
`CH_(3)NHCH_(3)`
`C_(2)H_(5)NHCOCH_(3)`

Answer :D
Discussion
17281.

Write the reaction of F_(2) and Cl_(2) with water.

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Solution :`F_(2)` being a strong oxidising agent oxidises `H_(2)O` to `O_(2)` or `O_(3)`.
`{:(2F_(2)(G) + 2H_(2)O(l) rarr 4H^(+)(aq)+4F^(-)(aq)+O_(2)(g)),(3F_(2)(g)+3H_(2)O(l) rarr 6H^(+)(aq)+6F^(-)(aq)+O_(3)(g)):}`
`Cl_(2)`, on the other hand, reacts with `H_(2)O` to form hydrochloric acid and hypochlorous acid
`Cl_(2)(g)+H_(2)(l) rarr underset("Hydrochloric acid")(HCl (aq))+underset("Hypochlorous acid")(HOCl (aq))`
Discussion
17282.

Write the equation involved in the Kolbe's reaction

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SOLUTION :(II) Kolbe.s REACTION :
Discussion
17283.

What is the role of silica in the extraction of copper?

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Solution :The copper ore is heated in a reverberatory FURNACE after MIXING with silica. Iron oxide forms a slag of `FeSiO_(3)" with "SiO_(2)`
`{:(FeO + SiO_(2) to FeSiO_(3)), ("Slag"):}`
The slag is removed and copper MATTE is then charged into the silica lined converter.
Discussion
17284.

Which is not correct for Amino Acid ?

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It is component of PROTEIN structure.
It has high boiling POINT.
Natural Amino Acid having D-configuration.
Having characteristic of point.

SOLUTION :Natural Amino Acid having D-configuration.
Discussion
17285.

Which of the following is not isostructural with IF_(4)

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`[Cu(NH_(3))_(4)]^(+2)`
`XeF_(4)`
`BF_(4)^(-)`
`[NI(CN)_(4)]^(-2)`

Solution :`BF_(4)^(-)` is TETRAHEDRAL `(SP^(3)` - HYBRIDISATION )
Discussion
17286.

The structure of 4-methylpent-2-en-1-ol is:

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`(CH_(3))_(2)C=CHCH_(2)CH_(2)OH`
`(CH_(3))_(2)CHCH=CHCH_(2)OH`
`CH_(3)CH_(2)C H=CHCH_(2)OH`
`CH_(3)CHOHCH=C(CH_(3))_(2)`

ANSWER :B
Discussion
17287.

Who proposed the concept that solute particles in solution behaves like gaseous molecules?

Answer»

Boyle
van't Hoff
Nollet
Charles

Answer :B
Discussion
17288.

Which of the following will be the final product when C_2H_2 reacts with HCl

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`UNDERSET(CHCL)OVERSET(CH)(||)`
`underset(CHCl_2)overset(CH_3)|`
`undersetunderset(CHCl)overset(CHCl)(||)`
NONE of these

Solution :
Discussion
17289.

Which of the following characteristics of the transition metals is associated with their catalytic activity ?

Answer»

VARIABLE OXIDATION states
High ENTHALPY of ionization
High MELTING points
Colour of HYDRATED ions

Answer :A
Discussion
17290.

Write the coordination number and oxidation state of Platinum in the complex [Pt(en)_2Cl_2]

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SOLUTION :COORDINATION Number = 6 , Oxidation STATE = +2
Discussion
17291.

Write the conditions to maximize the yield of H_(2)SO_(4) by Contact process.

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Solution :The KEY step in the PRODUCTION of `H(2)SO_(4)` is the OXIDATION of `SO_(2)` to `SO_(3)`.
`SO_(2)(g) + O_(2)(g) hArr 2 SO_(3)(g) , Delta_(f)H^(@) = -196.6 kJ mol^(-1)`
The reaction is exothermic, reversible and the forward reaction proceeds with decrease in volume. Therefore, in accordance with Le chatelier's principle, to maximize the yield of `SO_(3)` and hence of `H_(2)SO_(4)`, a low temperature (720 K to have OPTIMUM rate), a high pressure (2 bar) and `V_(2)O_(5)` is used as a catalyst (to increase the rate at 720 K).
Discussion
17292.

Which one of the following equations does not correctly represent the first law of thermodynamics for the given process

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Isothermal process : Q = - w
Cyclic process : q = - w
Isochoric process : `DeltaE = q`
Adiabatic process : `DeltaE = - w`

Solution :In adiabatic process, no HEAT is allowed to enter or leave the system, i.e. q = 0
Substituting this value in first law of thermodynamics,
`DeltaE=q+W`, we get `DeltaE=W`
In adiabatic expansion, work is DONE by the system on the surroundings hence W is NEGATIVE. According `DeltaE` is also negative, i.e. internal energy decreases.
In adiabatic compression, W is positive, `DeltaE` is also positive.
Discussion
17293.

Which of the following is prepared by electrolytic method

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CA
SN
S
`F_(2)`

ANSWER :D
Discussion
17294.

What are food additives? Give example.

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Solution :(i) The substances which are not naturally a part of the food and added to improve the quality of food are called food additives.
(ii) e.g., AROMA COMPOUNDS, antioxidants, preservatives, STABILIZERS, food colours, BUFFERING substances are food additives.
Discussion
17295.

Which of the following statements is INCORRECT on the basis of Ellingham diagram ?

Answer»

Below 1000 K , CO can reduce `Fe_(2)O_(3)` to FE.
Below 1000 K , `CO_(2)` is more STABLE than CO.
Below 1000K , CARBON cannot reduce `Al_(2)O_(3)` to Al.
Above 1000 K, CO is less stable than `CO_(2)`

Answer :D
Discussion
17296.

Which one of the following is /aretraquilizer ?

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VERONAL
Valium
Equanil
All of these

ANSWER :D
Discussion
17297.

Which of the following is not in green house gas

Answer»

`CO_(2)`
`CH_(4)`
`O_(3)`
`N_(2)`

Answer :D
Discussion
17298.

When a photoelectric substance was irradiated with a light of frequency 4 xx 10^12 kHz, the photoelectrons emitted whenthe same substance was irradiated with light of frequency 2 xx 10^12 kHz. The work functionof the substance is :

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`6.6 XX 10^(-19)J`
`6.6 xx 10^(-20) J`
`3.3 xx 10^(-19) J`
`3.3 xx 10^(-20) J`

Answer :A
Discussion
17299.

Which of the following is used as a refrigerant ?

Answer»

`"COCl"_(2)`
`"CCL"_(4)`
`CF_(4)`
`CF_(2) Cl_(2)`

Answer :D
Discussion
17300.

When a drop of a concentrated HCl solution is added to one litre of pure water at 25^(@)C, the pH drops from 7 to about 4. When the second drop of the same HCI solution is added, the pH further drops to about

Answer»

3.7
2
1
0

Answer :A
Discussion