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301.

Which one of the following mixtures is suitable for making a buffer solution will an optimum pH of 9.2 - 9.3 ?

Answer»

`CH_3CO_2Na//CH_3CO_2H (K_a = 1.8 xx10^(-5))`
`NH_3//NH_4Cl (K_a(NH_4^(+))=5.6 xx10^(-10)) `
`NaNO_2//HOCl(K_a = 4.5 xx10^(-8))`
`NaNO_2//HNO_2(K_a = 4.5xx10^(-4))`

ANSWER :B
Discussion
302.

Which compound is used in photography ?

Answer»

`Na_(2)SO_(5)`
`Na_(2)S_(2)O_(8)`
`Na_(2)S_(2)O_(6)`
`Na_(2)S_(2)O_(3)`

Answer :D
Discussion
303.

When propanol is heated with AI_(2)O_(3) at 380^(@)C (633K), the product obtained is:

Answer»

Dipropyl ether
Propene
Ethen
Diethyl ether

Solution :NA
Discussion
304.

What happeas when persistent dialysis of a colloidal solution is carried out?

Answer»

SOLUTION :COAGULATION OCCURS
Discussion
305.

Write down the number of 3d electrons in each of the folloowing ions : Ti^(2+),V^(2+), Cr^(3+), Mn^(2+), Fe^( 2+),Fe^(3+),Co^(2+),Ni^(2+) and Cu^(2+)Indicate how would you expect the five 3d orbitals to be occupied for these hydrated ions ( octahedral).

Answer»

SOLUTION :
Discussion
306.

Which of the following are used as antacids?

Answer»

`NaHCO_(3)`
`Al(OH)_(3)`
`Mg(OH)_(2)`
NACL

Answer :A::B::C
Discussion
307.

What is liquation?

Answer»

Solution :It is refining process in with a METALL with low melting POINT is separated by HEATING to MELT and flow out.
Discussion
308.

Which of the fo llowing reaction is possible at anode?

Answer»

`2Cr^(3+)+ 7H_(2)OTO Cr_(2)O_(7)^(2-) +14H^(+)`
`F_(2) to 2F^(-)`
`(1//2) O_(2)+ 2H^(+) to H_(2)O`
None of these

Solution :`2Cr^(3+) +7H_(2)OtoCr_(2)O_(7)^(2-) +14H^(+)`
O.S. of CR changes from +3 to +6 by LOSS of electrons. At anode oxidation takes place.
Discussion
309.

What is formed when calcium carbide reacts with heavy water?

Answer»

`C_2D_6`
`C_2D_4`
`C_2D_2`
`C_2D_5OD`

ANSWER :C
Discussion
310.

What is the shape of [Ni(CN)_(4)]^(2-)?

Answer»

SOLUTION :SQUARE PLANAR.
Discussion
311.

Which of the following has been used in the manufacture of non-inflammable photographic films

Answer»

CELLULOSE nitrate
Cellulose ACETATE
Cellulose XANTHATE
Cellulose perchlorate

Answer :B
Discussion
312.

Which of the following conditions will always lead to a non-spontaneous change

Answer»

POSITIVE `DeltaH` and positive `DeltaS`
NEGATIVE `DeltaH` and negative `DeltaS`
Positive `DeltaH` and negative `DeltaS`
Negative `DeltaH` and positive `DeltaS`

SOLUTION :When `DeltaH=+ve` and `DeltaS=-ve` REACTION is non-spontaneous.
Discussion
313.

Which of the following compound is an allylic alcohol ?

Answer»




ANSWER :D
Discussion
314.

Which is optically active :-

Answer»




ANSWER :A
Discussion
315.

Which of the followingpolymer can be remelted time to time withoutproducingany change ?

Answer»

Thermosettingpolymers
THERMOPLASTIC POLYMERS
bakelite
Melamineformaldehyde polymer

SOLUTION :Thermoplasticspolymers are those polymers in which inter molecular forces are moderate and , which are capable of repeatedly softening on HEATING and hardenson COOLING.
Discussion
316.

Vapour pressure of pure water at 298 K is 23.8 mm Hg. 50 g of urea (NH_2CONH_2)is dissolvedin 850 g of water. Calculate the vapour pressure of water for this solution and its relative lowering.

Answer»

SOLUTION :The DATA provided is as GIVEN below :
`p^0 = 23.8 mm`
`w_2 = 50 g , M_2 ("urea") = 60 g "mol"^(-1)`
` w_1 = 850 g, M_1 ("water") = 18 g "mol"^(-1)`
Applying Raoult.s law,
`(p^0 - p_x)/(p^0) = (n_2)/(n_1+ n_2) = (w_2 // M_2)/(w_1 // M_1 + w_2 // M_2)`
Substituting the values, we get
`(p^0 - p_x)/(p^0) = (50 // 60)/(850//18 + 50//60) = (0.80)/(47.22 + 0.83) = 0.017`
Thus, RELATIVE lowering of VAPOUR pressure = 0.017
Vapour pressure of water for this solution means `P_s`
Substituting `p^0` = 23.8 mm, we get
`(23.8 - p_0)/(p_s) = 0.017 " or " 23.8 -p_s = 0017 p_s`
`1.017 p_s = 23.8 " or " p_s = 23.4 mm`
Thus, vapour pressure of water in the solution = 23.4 mm Hg.
Discussion
317.

What is the normal boiling point of the solution represented by the phase diagram ?

Answer»

A
B
C
D

Answer :D
Discussion
318.

The species which undergo disproprotionation in alkaline medium is/are 1. Cl_(2) 2. MnO_(4)^(-) 3. NO_(2) 4. ClO_(4)^(-) The correct statement is/ are

Answer»

`Cl_(2)`
`MnO_(4)^(-)`
`NO_(2)`
`ClO_(4)^(-)`

Solution :`OVERSET((0))(Cl_(2))-2NaOH to Na overset((-1))(CL)+NaO overwset((+1))(Cl)+H_(2)O`
`overset((+4))(NO_(2))+2NaOH to Na overset((+3))(NO_(2))+Na overset((+5))(NO_(3))+H_(2)O`
In a disproportionation reaction, same ATOM, ion or molecule is simultaneously oxidized and and reduced.
Discussion
319.

What is a chelate ligand? Give one example

Answer»

SOLUTION :The LIGAND which contain from TWO or more donar sites simultaneously to form CYCLIC complaces. Example, ethane-1-2 diammine.
Discussion
320.

Which among the following is a polydentate ligand?

Answer»

Oxalate
Ethane-1, 2-diamine
`EDTA^(4-)`
`SCN^-`

ANSWER :C
Discussion
321.

Which of the following f.c.c. structures contains cations in alternate voids?

Answer»

NaCl
ZnS
`Na_(2)O`
`CaF_(2)`

ANSWER :B
Discussion
322.

What happens when nitropropane is heated above 300^@C ?

Answer»

SOLUTION :`CH_3CH_2 - CH_2NO_2 RARR CH_3CH = CH_2 + HNO_2`
Discussion
323.

Zn and Cd metals do not show variable valency because:

Answer»

They have only two electrons in the OUTMOST subshells
Their d-subshells are completely filled
Their d-subshells are partially filled
They are relatively SOFT metals

Answer :B
Discussion
324.

Werner proposed coordination theory to explain the properties and stuructures of various metal ammines of cobalt, chromium, platinum, etc. It was first successful attempt which satisfactorily described the formation of coordination compounds from stable molecules. Which of the following has four number of ions in aqueous solution ?

Answer»

`K_(4)[Fe(CN)_(6)]`
`K_(2)[PtCl_(6)]`
`[Co(NH_(3))_(6)]Cl_(3)`
`[NI(CO)_(4)]`

Answer :C
Discussion
325.

Which of the following pairs shows isomerism?

Answer»

`CH_(2)Cl_(2)andCHCl_(3)`
`CH_(3)OCH_(3)andC_(2)H_(5)OH`
`C_(6)H_(6)andC_(3)H_(8)`
`C_(2)H_(4)andC_(3)H_(6)`

Answer :B
Discussion
326.

Which of the following is a thermosetting polymer?

Answer»

TEFLON
PVC
GLYPTAL
Bakelite

Answer :D
Discussion
327.

Which is/are not the true statement(s) about KMnO_(4)?

Answer»

Its SOLUTION is unstable in acidic medium
It gets reduced to `MnO_(2)` in neutral medium
`MnO_(4)^(-)` changes to `Mn^(2+)` in basic medium
It is a self INDICATOR in `FeSO_(4)` and oxalic acid titrations.

Solution :`MnO_(4)^(-)` changes to `Mn^(2+)` in acidic medium
`MnO_(4)^(-)+8H^(+)+5e^(-) to Mn^(2+)+4H_(2)O`.
Discussion
328.

What is hybridization of Ni in [NICI_4]^(2-) ?

Answer»

`SP^3 d `
`dsp^2`
`sp^3 d^2`
`sp^3`

ANSWER :B
Discussion
329.

Which of the following statements is false regarding saline hydrides ?

Answer»

In the molten state they conduct electricity
They DISSOLVE in WATER GIVING off hydrogen
They are used to reducing agents
They are COVALENT in nature

Answer :D
Discussion
330.

Werner proposed coordination theory to explain the properties and stuructures of various metal ammines of cobalt, chromium, platinum, etc. It was first successful attempt which satisfactorily described the formation of coordination compounds from stable molecules. Which of the following compound has 2 primary valencies ?

Answer»

`CoCl_(3).6H_(2)O`
`[Co(NH_(3))_(6)]Cl_(2)`
`CrCl_(3).6H_(2)O`
None of these

Answer :B
Discussion
331.

Werner proposed coordination theory to explain the properties and stuructures of various metal ammines of cobalt, chromium, platinum, etc. It was first successful attempt which satisfactorily described the formation of coordination compounds from stable molecules. Which of the following has higher molar conductance ?

Answer»

`[Co(NH_(3))_(5)Br]SO_(4)`
`[Co(NH_(3))_(5)SO_(4)]Br`
Both (a) and (B)
None of these

Solution :`[Co(NH_(3))_(5)Br]^(2+)"" SO_(4)^(2-)` has GREATER MOLAR conductnace than `[Co(NH_(3))_(5)SO_(4)]^(+) Br^(-)`
Discussion
332.

xCl_(2) +NaOH rarr NaCl + NaClO_(3) + H_(2) O. What is the ratio of y to that of x ?

Answer»


Solution :`X Cl_(2) + y NaOH rarr 5NaCl+ NaClO_(3) + 3H_(2)O `
`3Cl_(2) + 6NaOHrarr 5NaOH + NaClO_(3)+ 3H_(2) O `. `:. x = 3, y = 6 :. ( y )/( x ) = ( 6)/( 3) = 2 `
Discussion
333.

Which of the following is magnetite?Fe_3O_4,Fe_2O_3,Fe_2O_3 3H_2O,Fe_2CO_3.

Answer»

`Fe_3O_4`
`Fe_2O_3`
`Fe_2O_3 3H_2O`
Fe_2CO_3

Answer :A
Discussion
334.

The spin-only magnetic moment of an ion is 3.87 BM. The ion is

Answer»

`TI^(2+)`
`Co^(2+)`
`Cu^(2+)`
`MN^(2+)`

ANSWER :B
Discussion
335.

Which of the following relation is correct for degree of hydrolysis of CH_(3)COONH_(4) ?

Answer»

`h= sqrt((K_(h))/(c ))`
`h=sqrt((K_(a))/(K_(b)))`
`h=sqrt((K_(W))/(K_(a)K_(b)))`
`h=sqrt((K_(a)K_(b))/(K_(h)))`

Solution :If X is the solubility of `Ca_(3)(PO_(4))_(2)`,
`Ca_(3)(PO_(4))_(2)HARR 3Ca^(2+)+2PO_(4)^(3-)`
`K_(sp)=[Ca^(2+)]^(3)[PO_(4)^(3-)]^(2)`
`[Ca^(2+)]=3x, PO_(4)^(3-)=2x`
`therefore K_(sp)=(3x)^(3)(2x)^(2)=108 x^(5)`
Discussion
336.

Whatshouldbetheconsiderations duringtheextraction of metalsbyelectrochemical method ?

Answer»

SOLUTION :Duringextractionofmetalsbyelectrochemical method,the following twopoints mustbeconsideredtothat properprecautions canbetaken:
(i)Reactivityofofmetals.If the metalsarequitereactiveand are expectedto reactwithwater , i.e,Na,Ca, Al,ETC. thenthemetalsshouldbeextractedbyelectrolysisof theirpurifiedmoltenoresratherthan theiraqueoussolutions. Forexample,Al isextractedbyelectrolysis of moltenalumina.
(ii) SUITABILITY ofelectrodes. Theelectrodesselected shouldnotreactwiththeproductsof electrolysis. IFAT all theyreact,thentheelectrodesmustbemade upofametarialwhich isquite cheap sinceetheirperiodicreplacement shouldnotincrease thecostoftheprocess. Forexample, in theelectrolysis of alumina,` O_ 2`isliberatedatthe ANODE.IfFe orAl is madeastheanode, itwillbeattackedby` O_2`forming`Fe_2O_ 3orAl_2O _ 3`. As aresult, theanode will beeatenaway.Instead ofFeandAl,the anodesofcarbonarepreferredbecausecarbonis muchcheaperthanFeorAl. Thus,electrolysisof` Al_ 2O_3`is carriedout inanelectrolytictank usingcarbonas anode.
Discussion
337.

Wrtie structure of the product formed : (a) CH_(3)CH_(2)COOHoverset(Cl_(2)red.P_(4))undersetDeltato C_(6)H_(5)COCloverset(H_(2)*Pd-BaSO_(4))underset(Delta)to

Answer»

SOLUTION : STRUCTURE of the product formed are given below:
(a) `H-undersetunderset(H)(|)oversetoverset(H)(|)C-undersetunderset(H)(|)oversetoverset(Cl)(|)C-oversetoverset(O)("||")C-O-H`
(b) `C_(6)H_(5)-oversetoverset(O)("||")C-Cl`
Discussion
338.

Which one of the following is the IUPAC name of [Cr(en)_(3)][CrF_(6)]

Answer»

Triethylamine CHORMIUM `(III)` hexa fluriod CHROMIUM `(III)`
Tris (ethane-`1,2` diamine) chromium `(III)` hexa flurido CHROMATE `(III)`
Hexa fluoro chromium `(III)` tris (ethane-`1,2`-diamined) chromium `(III)`
Hexa fluoro chromate `(III)` triethyl amine chromium `(III)`

Answer :A::B::C::D
Discussion
339.

The solubility product (K_(sp) , mol^(3) dm^(-9) ) of MX_(2) at 298 K based on the information available for the given concentration cell is (take 2.303 xx R xx 298 // F = 0.059 V)

Answer»

`1 xx 10^(-15)`
`4 xx 10^(-15)`
`1 xx 10^(-12)`
`4 xx 10^(-12)`

Solution :The GIVEN concentration cell is `M | M^(2+) ` (saturated= `C_(1) ) || M^(2+) (0.001 M = C_(2))| M` EMF of concentration cell is :
`E_(cell) = (2.303 RT)/(nF) "LOG" (C_(2))/(C_(1)) = (0.059)/(N) "log" (C_(2))/(C_(1))`
`therefore 0.059 = (0.059)/(2) "log" (0.001)/(C_(1))`
`or 1 = (1)/(2) "log" (10^(-3))/(C_(1))or log 10^(-3) - log C_(1) = 2`
`or -3-log C_(1) = 2 or log C_(1) = -5`
or `C_(1) = 10^(-5)` M
For the SALT `MX_(2) , underset(S)(MX^(2)) to underset(S)(M^(2+)) + 2 underset(2 S)(X^(-))`
`K_(sp) = (S) (2S)^(2) = 4 S^(3) = 4 xx (10^(-5))^(3) = 4 xx 10^(-15)`
Discussion
340.

What weight of solute (mol. Wt. 60) is required to dissolve in 180 g of water to reduce the vapour pressure to 4//5^(th) of pure water ?

Answer»

<P>

SOLUTION :`"According to Raoult's Law," (P_(A)^(@)-P_(S))/P_(S)=n_(B)/n_(A)=(W_(B)xxM_(A))/(M_(B)xxW_(A))`
`P_(S)=4//5P_(A)^(@),W_(A)=180g, M_(B)=60g mol^(-1),M_(A)=18g mol^(-1)`
`((P_(A)^(@)-0.8P_(A)^(@)))/((0.8P_(A)^(@)))=((W_(B))xx(18g mol^(-1)))/((60g mol^(-1))xx(180g))`
`W_(B)=((0.2)xx(60g mol^(-1))xx(180g))/((0.18)xx(18g mol^(-1)))=150 G`
Discussion
341.

Which of the following is not a constituent of RNA

Answer»

Ribose
Phosphate
Adenine
Phyridine

Answer :D
Discussion
342.

Tyndall effect is possible in colloid due to .........

Answer»

ABSORPTION of LIGHT
adsorption of light
SCATTERING of light
reflection of light

Solution :scattering of light
Discussion
343.

Which of the following reactions do not occur

Answer»




ANSWER :A::B
Discussion
344.

Which of the following is present in a hormone thyroxine ?

Answer»

Fluorine
IODINE
BROMINE
Chlorine

Answer :B
Discussion
345.

Why Cd^(2+) salts are white ?

Answer»

SOLUTION :It has COMPLETELY FILLED d-orbitals.
Discussion
346.

Write the IUPAC name of the complex: [Ag (NH_3)_2] [Ag(CN)_2] .

Answer»

SOLUTION :Diamminesilver (I) dicyanoargentate (I)
Discussion
347.

The wave function, psi_(n), l, m_(l) is a mathematical function whose value depends upon spherical polar coordinates (r,theta,phi) of the electron and characterised by the quantum number n,l and m_(l). Here r is distance from nucleus, theta is colatitude and phi is azimuth. In the mathematical functions given in the Table, Z is atomic number and a_(0) is Bohr radius. For He^(+) ion, the only INCORRECT combination is

Answer»

(I) (i)(S)
(II)(ii) (Q)
(I)(III)(R)
(I)(i)(R)

ANSWER :C
Discussion
348.

The wave function, psi_(n), l, m_(l) is a mathematical function whose value depends upon spherical polar coordinates (r,theta,phi) of the electron and characterised by the quantum number n,l and m_(l). Here r is distance from nucleus, theta is colatitude and phi is azimuth. In the mathematical functions given in the Table, Z is atomic number and a_(0) is Bohr radius. For the given orbital in Column I, the Only CORRECT combination for any hydrogen-like species is

Answer»

(II)(ii)(P)
(I)(ii)(S)
(IV)(iv)(R)
(III)(iii)(P)

ANSWER :A
Discussion
349.

The wave function, psi_(n), l, m_(l) is a mathematical function whose value depends upon spherical polar coordinates (r,theta,phi) of the electron and characterised by the quantum number n,l and m_(l). Here r is distance from nucleus, theta is colatitude and phi is azimuth. In the mathematical functions given in the Table, Z is atomic number and a_(0) is Bohr radius. For hydrogen atom, the only CORRECT combination is

Answer»

<P>(I ) (i)(P)
(I)(iv)(R)
(II)(i)(Q)
(I)(i)(S)

ANSWER :D
Discussion
350.

What are the monomers of bakelite ?

Answer»

SOLUTION :PHENOL and FORMALDEHYDE .
Discussion