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21151.

Which of the following is a hypervalent compound?

Answer»

`BF_3`
`Al_2Cl_3`
`SF_6`
`PCl_3`

ANSWER :C
Discussion
21152.

Which of the following will show a negative deviation from Raoult's law ?

Answer»

ACETONE - BENZENE
Acetone -ETHANOL
Benzene - METHANOL
Acetone - chloroform

Answer :D
Discussion
21153.

What happens when PH_(3) reacts with oxygen or air?

Answer»

<P>

SOLUTION :When phosphine air or OXYGEN it burns to give meta phosphoric acid.
`4PH_(3)+8O_(2)overset(Delta)rarr underset("(Phosphorous pentoxide)")(P_(4)O_(10)+6H_(2)O)`
`P_(4)O_(10)+6H_(2)underset("Meta phosphoric acid")(overset(Delta)rarr4HPO_(3))+4H_(2)O`
Discussion
21154.

Which of the following will be the most stable diazonium salt(RN_(2)^(+) X^(-)) ?

Answer»

`CH_3N_2^(+)X^(-)`
`C_6H_5N_2^(+) X^(-)`
`CH_3CH_2N_2^+X^(-)`
`C_6H_5CH_2N_2^+X^(-)`

Solution :Out of the given diazonium SLTS , `C_6H_5N_2^(+)X^(-)` is RESONANCE stabilised HENCE most stable.
Discussion
21155.

The substance which is not an artificial sweetener

Answer»

sucralose
alitame
saccharin
SUCROSE

Solution :Sucrose is NATURAL SWEETNER.
Discussion
21156.

Which of the following ions is diamagnetic?

Answer»

`[Ni(H_(2)O)_(6)]^(2+)`
`[FeCl_(6)]^(4-)`
`[Ni(CO)_(4)]`
`[CR(H_(2)O)_(6)]^(2+)`

Solution :In `[Ni(CO)_(4)]`

CO is a strong field and in `[Ni(CO)_(4))` complex AL the ELECTRONS in d-orital are paired. Hence `[NI(CO)_(4)]` is diamagnetic in nature.
`H_(2)O` & `Cl^(-)` are weak field ligand hence do noc cause paireing.
Discussion
21157.

Which one of the following statements is not true regarding (+) lactose

Answer»

(+)LACTOSE, `C_(12)H_(22)O_(11)` CONTAINS 8-OH groups
on hydrolysis (+) lactose give equal amount of D(+) glucose and D(+) galactose
(+) Lactose is a `beta`-glycoside FORMED by the UNION of a D(+) glucose and a molecules of D(+) galactose
(+) lactose is reducing sugar and does not exhibit mutarotation

Solution :(+) lactose is a reducing sugar and it does not exhibit matarotation.
Discussion
21158.

The volume of water to be added to 100 mL of 0.5N H_(2)SO_(4) acid solution to get solution of decinormal concentration is :

Answer»

400 mL
450 nL
500 mL
100 mL

Solution :`N_(1)V_(1)=N_(2)V_(2)`
`(0.5 N)xx(100mL)=(0.1 N)xxV_(2)`
`V_(2)=((0.5N)xx(100mL))/((0.1N))=500mL`
Volume of water to be added=(500-100)=400 mL
Discussion
21159.

What is denaturaedalcohol?

Answer»

SOLUTION :ALCOHOL is MADE unfit for drinking by mixing some copper SULPHATE and pyridine. This is called denatured alcohol.
Discussion
21160.

The standard enthalpy of neutralization of strong acid and strong base is -57.3 kJ "equiv"^(-1). If the enthalpy of neutralization of the first proton of aqueous H_(2)S is -33.7 kJ mol^(-1) then the (pK_a)_(1) of H_(2)S is

Answer»

`((23.6 XX 10^(3) - T Delta s^@)/(2.303 RT))`
`((23.6 xx 10^(3) - T Delta s^@)/(2.303 RT))`
`((TDelta S^@ - 23.6)/(RT))`
`2.303((T DELTAS^(@) - 23.6)/(RT))`

ANSWER :A
Discussion
21161.

When aqueous solutions of two salts are mixed , the third salt formed may appear as a solid precipitate or a clear solution depending upon the solubility of its ions . It is observed that all salts of Na , K , NH_(4) are soluble . All nitrates and bicarbonates are also soluble . All halides (chlorides , bromides , iodides) are soluble except those of Ag , Hg (I) and Pb . Which one among the following combinations of solutions will produce a solid precipitate ?

Answer»

Sodium sulphate and barium chloride
Magnesium sulphate and barium BICARBONATE
Lithium IODIDE and barium chloride
Ammonium sulphate and potassium bromide

Solution :ACCORDING to this given data
`underset("sulphate")underset("Sodium") (Na_(2)SO_(4)) + underset("chloride")underset("Barium")(BaCl_(2)) to underset("(SOLUBLE)")(2NaCl) + underset(("ppt"))(BaSO_(4)) darr`
`underset("sulphate")underset("Magnesium")(MgSO_(4)) + underset("bicarbonate")underset("Barium")(Ba(HCO_(3))_(2)) to Mg underset(("Soluble"))((HCO_(3))_(2)) + underset((ppt))(BaSO_(4)) darr`
Both the above given combinations of solution will produce a precipitate of `BaSO_(4)`. Hence , option (a) white and (b) both are correct ANSWER.
Discussion
21162.

Write structures of the following compounds. (i) 2. Chloro - 3 - methylpentane (ii) 1. Chloro - 4-ethylecyclohexane (iii) 4. tert. Butyl - 3 - iodoheptane

Answer»

SOLUTION :(iv) `BrCH_(2)CH = CHCH_(2)Br`
(v)
Discussion
21163.

Values of heats of formation for SiO_(2) and MgO are -48.4 and -34.7 kJ respectively. The heat of the reaction 2Mg+SiO_(2)rarr2MgO+Si is

Answer»

21.16 kJ
`-21.0 kJ`
`-13.62` kJ
13.6 kJ

Solution :`DeltaH_(("reaction"))=2DeltaH_(F)^(@)(MGO)=-DeltaH_(f)^(@)(SiO_(2))`
`=2(-34.7)-(-48.4)=-21 kJ`.
Discussion
21164.

Which one of the following products obtained when diethyl when diethyl ether is boiled with water in presence of dilute acid

Answer»

Glycol
Ethyl alcohol
Ethylene oxide
Peroxide

Solution :On HEATING with dil. `H_(2)SO_(4)` under pressure ETHERS are hydrolysed to ALCOHOLS.
`R-O-R+H_(2)Ooverset("dil. H_(2)SO_(4))to 2R-OH`
Discussion
21165.

Which of the following behaviour is true about the ideal binary liquid solution?

Answer»

<P>PLOT of P(total) against `x_(A)` is non linear .
Plot of P(total) against `X_(B)` is linear slope =0
Plot of P(total) against `X_(B)` is linear with slope =0
Plot of P(total) against `x_(A)` is linear with slope =0

Answer :B
Discussion
21166.

Which of the following compound does not show metamerism?

Answer»

`CH_3-O-CH_3`
`CH_3-O-C_4H_9`
`CH_3-O-C_3H_7`
`CH_3-O-C_5H_11`

ANSWER :A
Discussion
21167.

When AgNO_(3) solution is added in excess to 1 M solution of CoCl_(3).XNH_(3) one mole of AgCl is formed? What is the value of 'X' ? (Assume that the co - ordination number is 6)

Answer»

1
4
3
2

Answer :B
Discussion
21168.

Which of the following cannot be used as alkylating reagent in Friedel-Crafts reaction-

Answer»

`(CH_3)_2CHCl`
`CH_2=CH-Cl`
`CH_2Cl_2`

ANSWER :B::D
Discussion
21169.

Which base is present in place of thiamine in RNA ?

Answer»

URACIL
CYTOSINE
GUANINE
ADENINE

SOLUTION :Uracil
Discussion
21170.

Which among the following group 16 elements exists in more than two allotropic states ?

Answer»

POLONIUM
TELLURIUM
SELENIUM
OXYGEN

SOLUTION :
Discussion
21171.

What are secondary cells?

Answer»

SOLUTION :Secondary CELLS are those which can be recharged by passing electric current through them and HENCE can be USED over and again.
Discussion
21172.

Which of the following is an oxidising agent?

Answer»

`[Mn_(2)(CO)_(10)]`
`[Fe(CO)_(5)]`
`[MN(CO)_(5)]`
`[Fe_(2)(CO)_(9)]`

Answer :C
Discussion
21173.

Which of the following has more atomic size

Answer»

N
As
P
Bi

Answer :B
Discussion
21174.

Which of the following hormones helps in the conversion of glucose into glycogen in the body:

Answer»

Insulin
Cortisone
Thyroxin
Oxytocin

Answer :A
Discussion
21175.

What us SHE ?

Answer»


ANSWER :
Discussion
21176.

Which of the following compound not shows test of unsaturation :-

Answer»




BOTH 2AND 3

Solution :Saturated and BENZENE can't shows TEST of UNSATURATION.
Discussion
21177.

What type of a battery is the lead storage battery 7 Write the anode and the cathode reactions and the overall reaction occurring in a lead storage battery when current is drawn from it. (b) In the button cell, widely used in watches, the following reaction takes place : Zn(s) + Ag_(2)O (s) + H_(2)O (l) to Zn^(2+)(aq) + 2Ag (s) + 2OH^(-) (aq) Determine E^(@) and DeltaG^(@) for the reaction. [Given: E_(Ag^(+)//Ag)^(@) =+0.80 V, E_(Zn^(2+)//Zn)^(@) =-0.76 V]

Answer»

Solution :Lead storage battery is a secondary cell.
Reactions at the anode and cathode when the current is drawn from it (discharge) are as follows :
At anode: `Pb(s) + SO_(4)^(2-)to PbSO_(4)(s) + 2e^(-)`
At cathode: `PbO_(2) (s) + 4H^(+)+ SO_(4)^(2-) to PbSO_(4) (s) + 2H_(2)O(L)`
Overall reaction: `Pb(s) + PbO_(2) (s) + 2H_(2)SO_(4) (AQ) to 2PbSO_(4) + 2H_(2)O(l)`
(b) `Zn(s) + Ag_(2)O(s) + H_(2)O (l) to Zn^(2+) (aq) + 2Ag(s) + 2OH^(-) (aq)`
GIVEN: `E_(Ag^(+)//Ag)^(@) = +0.80 V, E_(Zn^(2+)//Zn)^(@) = -0.76 V`
`E_("cell")^(@) = E_("cathode")^(@) -E_("anode")^(@)`
`=0.80 =-nFE^(@)`
`=-2 xx 96500 C mol^(-1) xx 1.56 V = -30180 J mol^(-1)`
`=-301.080 kJ mol^(-1)`
Discussion
21178.

What is native state of protein ?

Answer»

Solution :The ENERGETICALLY most STABLE shape of the protein at NORMAL pH and temperature is called native state.
Discussion
21179.

The rustingof iron takesplace as follows 2H^(opluse)+2e^(-)+1/2 O_(2)rarrH_(2)O(l),E^(-)=+1.23 V Fe^(2+)(aq)+2e^(-)+2e^(-)rarrFe(S),E^(-1)=-0.44V triangleG^(-) forthe netprocess is

Answer»

`-322 kJ mol^(-1)`
`-152 kJ mol^(-1)`
`-76 kJ mol^(-1)`
`-161 kJ mol^(-1)`

Solution :At CATHODE `2H^(opluse)(aq)+2E^(-)+1/2 O_(2)(G)rarrH_(2)O(l)`
At ANODE `Fe(s) rarr Fe^(2+) rarr Fe^(+) (aq) +2e^(-)`
`triangle G_(2)^(-) =- 2xxFe^(-) =(-) 2xxF(0.44)`
`2H^(+opluse)(aq)+1/2 O_(2) +Fe(s)rarrH_(2)O(l)+Fe^(2+) (aq)`
`triangle G_("net")^(-) =[-2F(1.123 )] +(-) 2F(0.44) ] =- 322.3 kJ "mol"^(-)`
Discussion
21180.

Write the chemical equations involved in the preparation of the following: (a) XeF_4(b) H_3PO_3

Answer»

SOLUTION :Chemical involved in the PREPARATION of `XeF_4` and `H_3PO_3` are given below :
(a) `XE + 2F_2 underset("1 BAR ") OVERSET(873K) to XeF_4`
(b) `underset(1:5 " ratio " ) (P_4O_6 ) + 6H_2O to 4H_3PO_3` (Phosphorous acid )
Discussion
21181.

Write the valence shell electronic configuration group - 16 elements.

Answer»

SOLUTION :`NS^(2)NP^(4)`
Discussion
21182.

The solubility products of MA, MB,MC and MD are 1.8 xx 10^(-10) , 4 xx 10^(-3) , 4 xx 10^(-8)and 6 xx 10^(-5) respectively. If a 0.01M solution of MX is added drop wise to a mixture containing A^(-) , B^(-) , C^(-)and D^(-) ions, then the one to be precipitated first will be :

Answer»

MA
MB
MC
MD

ANSWER :A
Discussion
21183.

What will be the molecular weight of NaCl determined experimentally following elevation in the boiling point or depression in freezing point method ?

Answer»

`LT 58.5`
`GT 58.5`
`= 58.5`
NONE of these

ANSWER :A
Discussion
21184.

Which one of the following is used as a catalyst in the conversion of Benzoic acid to Benzyl alcohol?

Answer»

NI
`LiAlH_4//H_2O`
`sn//HCl`
`ZN NAOH`

SOLUTION :`LiAlH_4//H_2O`
Discussion
21185.

What is the range of electrical conductivity in insulators ?

Answer»

SOLUTION :`10^(-20)-10^(-10)OHM^(-1)m^(-1)`
Discussion
21186.

What products do we get at cathode and anode during the electrolysis of molten and aqueous NaCl ?

Answer»

Solution :Moten NACL
(i) Na is deposited at cathode.
`Cl_(2)` is evolved at ANODE.
Aqueous NaCl
(II) `H_(2)` is evolved at cathode.
(iii) `Cl_(2)` is evolved at anode.
Discussion
21187.

Whichof thefollowingrotates the palne polarizedlight totwardsleft ?

Answer»

D(+) GLUCOSE
L(+) Glucose
D(-) Fructose
D(-)Galactose

ANSWER :C
Discussion
21188.

Which of the following equations does NOT represent Charles 's law for a given mass of gas at constant pressure?

Answer»

LOG V=log K+log T
`(V)/(T)=K`
`(d(LNV))/(df)=(1)/(T)`
log K=log V+log T

Solution :log K =log V+log T
Discussion
21189.

Two moles of an ideal monoatomic gas undergoes a cyclic process ABCA as shown in V-T diagram below: Work done by the gas during the entire cycle is :

Answer»

600R (1-ln2)
1200R
1200R(1-ln2)
Zero

Solution :For BC, VT=CONSTANT
or `PV^2`=constant (K=2 for polytropic PROCESS)
`:. W_(BC)=(nR)/(K-1)(T-T)=(2xxR)/(2-1)(1200-600)=1200R`
Work done by gas during ENTIRE cycle `=W_(AB)+W_(BC)+W_(CA)`
= - 1200 Rln2+1200 R+0 =1200 R(1-ln2)
Discussion
21190.

Which of the following do not contain peroxide ions

Answer»

`PbO_(2)`
`H_(2)O_(2)`
`SrO_(2)`
`BaO_(2)`

SOLUTION :`PbO_(2)` is lead dioxide whereas (b) `H_(2)O_(2), (c) SrO_(2), (d) BaO_(2)` CONTAIN peroxide ION.
Discussion
21191.

The standard reduction potentials of the metals A,B and C are 0.68, -2.50 and -0.50 V respectively. The order of their reducing power is :

Answer»

`A GT B gt C`
`A gt C gt B`
`C gt B gt A`
`B gt C gt A`

ANSWER :D
Discussion
21192.

Which one of the following is employed as a tranquiliser ?

Answer»

Naproxen
Tetracycline
Chloropheninamine
Equanil 

ANSWER :D
Discussion
21193.

Which is not true statement ?

Answer»

PROTEIN is polymer of `alpha`-amino acids
Protein is polymer of `BETA`-amino acids
Human BODY can SYNTHESIZE all proteins they need
Essential `alpha`-amino acids are not synthesized in body

ANSWER :B
Discussion
21194.

When tertiary butyl alcohol and 1-butanol are separately treated with a few drops of KMnO_(4), in one case only the purple colour disappears and a brown precipitate is formed. Which of the two alcohols gives the above reaction and what is that brown precipitate.

Answer»

Solution :1-butanol, being primary alcohol gets oxidised by dilute `KMnO_(4)`. The BROWN precipitate is DUE to the formation of manganese dioxide.
`2KMNO_(4)+H_(2)Orarr 3KOH +underset("(brown precipitate)")underset("manganese dioxide")(2MnO_(2))+3(O)`
`underset("1 - butanol")(CH_(3)-CH_(2)-CH_(2)-CH_(2)-OH)+overset(2(O))underset("room TEMP.")rarr underset("butanoic acid")(CH_(3)CH_(2)CH_(2)COOH)+H_(2)O`
Discussion
21195.

Which of the following disease is caused by the deficiency of alpha-Tocopherol ?

Answer»

Bone-deformation
STERILITY
SCURVY
BERI Beri

Solution :Sterility
Discussion
21196.

Which is the last element in the series of the actinoids ? Write the electronic configuration of this element. Comment on the possible oxidation state of this element.

Answer»

Solution :Last ACTINOID is Lawrencium (Z = 103).
Electronic configuration = `[RN]5f^(14)d^(1)7S^(2)`
Possible oxidation state = +3.
Discussion
21197.

Which member of the halogen family(X_2) does not show positive oxidation state (X_2^+)?

Answer»

Fluorine
Chlorine
Bromine
Iodine

Answer :A
Discussion
21198.

The sex hormone which controls the development and maintanance of pregnancy is

Answer»

CORTISONE
THYROXINE
Progesterone
estrone

Answer :C
Discussion
21199.

Which ofthefollowingfactorsisof no significancefor roastingsulphideoresto the oxidesand notsubjectingthesulphideorestocarbonreductiondirectly ?

Answer»

` CO_ 2`is morevolatile THN` CS _2 `
Metalsulphideare thermodynamically morestablethan ` CS_ 2`
` CO_2`isthermodynamicallymorestablethan` CS_ 2 `
Metalsulphidesare less stablethanthecorrespondingoxides

Answer :B
Discussion
21200.

The reduction potentials of four metals P,Q,R and Sare -2.90,+.34,+1.20 and -0.76 respectively. Reactivity dereases in the order.

Answer»

<P>`P GT Q gt R gt S`
`Q gt P gt R gt S`
`R gt Q gt S gt P`
`P gt S gt Q gt R`

ANSWER :D
Discussion