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17751.

which of the following drugs is a tranquilizer and sedative?

Answer»

Sulphdiazine
Papaverine
Equanil
Mescaline

Answer :C
Discussion
17752.

When hydrocarbons are burned in limited amount of air both CO and CO_(2) are fomed. When 54 gm of a particular hydrocarbon was burned in air 56 gm of CO, 88 gm of CO_(2) and 54 gm of H_(2)O were formed. How many gram of O_(2) would be required for complete conbustion of 54 gm of hydrocarbon ?

Answer»

`352 gm`
`176 gm`
`320 gm`
`200 gm`

SOLUTION :`{:(Sol.(i),C_(x)H_(y),+,(x + (y)/(2)) O_(2),rarr,xCO,+,(y)/(2)H_(2)O,),("mole",a_(0),,(x + (y)/(4)) a_(0),,,,,),(,0,,"0",,xa_(0),,(y)/(2) a_(0),),(,CO,+,(1)/(2)O_(2),rarr,,CO_(2),,),(,xa_(0) - z,,(z)/(2),,,z,,):}`
`n_(CO) = xa_(0) - z = (56)/(28) = 2` .........(i)
`N_(CO_(2)) = z = (88)/(44) = 2` .......(ii)
`xa_(0) = z + 2`
`xa_(0) = 4`
`n_(H_(2)O) = (y)/(2)a_(0) = (54)/(18) = 3`
`ya_(0) = 6` .....(iii)
Equation (ii)/(iii)
`1(x)/(y) = (2)/(3)`
Empirical formula `= C_(2)H_(3)`
(ii) `C_(2)H_(3) + (11)/(2) O_(2) rarr 2CO_(2) + (3)/(2) H_(2)O`
`n_(O_(2))` required `= (11)/(2)`
`W_(O_(2)) = (11)/(2) xx 32 = 176 gm`
Discussion
17753.

Which of the following does not exist as a Zwitter ion ?

Answer»

Glycine
Glutamic acid
Sulphanilic acid
p-aminobenzoic acid

Solution :o and p- aminobenzoic acids do not exist as Zwitter ion. The LONE pair of electrons on the `NH_2` group is DONATED towards the benzene ring due to resonanace effect. As a result , acidic CHARACTER of -COOH group group and basic character of `-NH_2` group decreases.
Therefore, the weakly acidic -COOH group cannot trasnfer `H^+` ion to the weakly basic `-NH_2` group. thus , o or p-aminobenzoic acids do not exist as Zwitter ion .
Discussion
17754.

When hydrocarbons are burned in limited amount of air both CO and CO_(2) are fomed. When 54 gm of a particular hydrocarbon was burned in air 56 gm of CO, 88 gm of CO_(2) and 54 gm of H_(2)O were formed. What is emperical formula of compound ?

Answer»

`C_(2)H_(2)`
`C_(2)H_(2)`
`C_(4)H_(6)`
`C_(2)H_(3)`

Solution :`{:(Sol.(i),C_(x)H_(y),+,(x + (y)/(2)) O_(2),rarr,xCO,+,(y)/(2)H_(2)O,),("mole",a_(0),,(x + (y)/(4)) a_(0),,,,,),(,0,,"0",,xa_(0),,(y)/(2) a_(0),),(,CO,+,(1)/(2)O_(2),rarr,,CO_(2),,),(,xa_(0) - z,,(z)/(2),,,z,,):}`
`n_(CO) = xa_(0) - z = (56)/(28) = 2` .........(i)
`N_(CO_(2)) = z = (88)/(44) = 2` .......(ii)
`xa_(0) = z + 2`
`xa_(0) = 4`
`n_(H_(2)O) = (y)/(2)a_(0) = (54)/(18) = 3`
`ya_(0) = 6` .....(iii)
Equation (ii)/(iii)
`1(x)/(y) = (2)/(3)`
Empirical formula `= C_(2)H_(3)`
(ii) `C_(2)H_(3) + (11)/(2) O_(2) rarr 2CO_(2) + (3)/(2) H_(2)O`
`n_(O_(2))` required `= (11)/(2)`
`W_(O_(2)) = (11)/(2) XX 32 = 176 gm`
Discussion
17755.

Write the name of the monomers of thefollowing polymers :

Answer»

SOLUTION :ETHYLENE GLYCOL and terephthalic ACID
Discussion
17756.

Tranqillizers are substances used for the treatment of

Answer»

Cancer
AIDS 
PHYSICAL disorders
Blood INFECTION 

ANSWER :C
Discussion
17757.

Which of the following is different from other three oxides?

Answer»

MgO
SnO
ZnO
PbO

Answer :A
Discussion
17758.

The term "Biomagnification refers to the

Answer»

Growth of ORGANISM DUE to food consumption
Increase in population size
Blowing up of environmental ISSUES by man
Increase in the CONCENTRATION of non-degradable POLLUTANTS as they pass through food chain

Answer :D
Discussion
17759.

The vapour pressure of two pure liquids (A) and (B) are 100 and 80 torr respectively. The total pressure of solution obtained by mixing 2 mole of (A) and 3 mole of (B) would be:

Answer»

120 torr
36 torr
88 torr
180 torr

Answer :C
Discussion
17760.

Which of the followingmetal can be obtained by the electrolysis of the aqueous solution of their salts ?

Answer»

CU
Na
Mg
K

SOLUTION :Copper metal (Cu) is obtained by the ELECTROLYSIS of the aqueous solution of their SALTS .
Discussion
17761.

Which of the following metal ion can give red precipitate with K_(2) CrO_(4)

Answer»

 `Hg_(2)^(+2)`
`AG^(+)` 
`PB^(+2)`
`HG^(2+)` and `Ag^(+)` boht

Answer :D
Discussion
17762.

Which of the following species has ppi-ppi-dpi bonding?

Answer»

`NO_(3)^(-)`
`SO_(3)^(2-)`
`BO_(3)^(3-)`
`CO_(3)^(2-)`

ANSWER :B
Discussion
17763.

Which of the following is incorrect with respect to the property indicated ?

Answer»

Electronegativity: `F_2 gt Cl_2 gt Br_2`
Electron AFFINITY : `Cl_2 gt F_2 gt Br_2`
OXIDATION power: `F_2 gt Cl_2 gtBr_2`
Bond energy : `F_2 gt Cl_2 gt Br_2`

Answer :D
Discussion
17764.

Which of the following compound is optically active?

Answer»

n-butyl alcohol
iso butyl alcohol
2-butanol
TERTIARY butyl alcohol

ANSWER :C
Discussion
17765.

When NaOH is prepared in Castner-Kellner cell,the gas evolved at the anode is

Answer»

`O_2`
`O_3`
`Cl_2`
HCl

Answer :C
Discussion
17766.

When two ligands of the same type occupy opposite positions to each other in a coordination polyhydron, the isomer is called

Answer»

trans-
cis-
fac-
mer-

Answer :A
Discussion
17767.

Which is false for the following reaction ? underset( A)([Cu(H_(2)O)_(3) OH]^(+) )+underset(B) ( [ Al(H_(2)O)_(6)]^(3+))rarrunderset( C ) ([Cu(H_(2) O)_(4)]^(2+)) +underset( D) ([Al(H_(2)O)_(5) OH]^(2+))

Answer»

A is base and B is acid
C is CONJUGATE acid of A
B is conjugate acid of D
B is conjugate base of D

Answer :D
Discussion
17768.

Unstable substances exhibit higher radioactivity due to

Answer»

low p/n RATIO
high p/n ratio
p/n = 1
none of these

Solution :Higher the n/p ratio, more unstalbe is the NUCLEUS and hence radioactive.
Discussion
17769.

which of the following sulphides cannot be reduced to metal by H_(2)at about 1000^(@)C?

Answer»

HgS
PbS
`CS_(2)`
`Bi_(@)S_(3)`

Answer :B
Discussion
17770.

What is the standard electrode potential for the electrode, MnO_4^-//MnO_2 in an acid solution? E_(MnO_4^-,Mn^(2+))^@=1.51 V, E_(MnO_2,Mn^(2+))^@=1.23V

Answer»

SOLUTION :`MnO_4^(-) +8H^+ +5e to Mn^(2+)+4H_2O , E^@=1.51 ` volts
`THEREFORE Delta G^@=-5(1.51 ) F=-7.55 F`
`MnO_2+ 4H^+ +2e to Mn^(2+) +2H_2O, E^@=1.23` volts
`therefore Delta G^@=-2(1.23) F=-2.46 F`
On subtracting
`MnO_4^(-) -MnO_2 +4H^+ +3E to 2H_2O`,
`Delta G^@=-7.55 F-(2.46) =-5.09 F`
or `MnO_4^(-) +4H^+ +3e to MnO_2+ 2H_2O, Delta G^@=-5.09F`
`therefore E_(MnO_4^-,MnO_2)^@= (Delta G^@)/(-nF)=(-5.09 F)/(-3F)=1.70` volts
Discussion
17771.

Which of the following is a simplest aminoacid?

Answer»

GLYCINE
Alanine
Leucine
Valine

Solution :`H_2NCH_2COOH` (glycine) is the SIMPLEST AMINO ACID.
Discussion
17772.

Which statements is/are correct:

Answer»

<P>`(deltaH//deltaT)_p-(deltaU//deltaT)_v=R`
`(deltaH//deltaT)_pgt(deltaU//deltaT)_v`
`(deltaE//deltaV)_T` for IDEAL GAS is zero
All

Answer :D
Discussion
17773.

Which of the following solution will have the highestfreezing point and which will have the lowest freezing point and why ? (i) 0.1 M NaCl solution (ii) 0.1 M glucose solution (iii) 0.1 M BaCl_(2) solution

Answer»


SOLUTION :Glucose does not DISSOCIATE, NaCl DISSOCIATES to give two ions, `BaCl_(2)` dissociates to give three ions. Depression in freezing POINT will be maximum for `BACl_(2)` and minimum for glucose solution. Hence, `BaCl_(2)` solution will have the lowest and glucose solution will have the highest freezing point.
Discussion
17774.

Which one is correct ?

Answer»

Freon-14 is `CF_(4)`, Freon-13 is `CF_(3)CL`, Freon-12 is `CF_(2)Cl_(2)` and Freon-11 is `CFCl_(3)`.
FREONS are chlorofluorocarbons.
Freons are used as refrigerants.
All the above.

Answer :D
Discussion
17775.

Which of the following is obtained when 4- Methylbenzenesulphonic acid is hydrolysed with excess of sodium acetate?

Answer»




ANSWER :C
Discussion
17776.

What are artificial sweetening agents ? Give two examples.

Answer»

Solution :Artificial PRODUCTS that controls the CALORIES and PROVIDES sweetness is called artificial sweetning AGENTS. e.g., Aspartem, ALITAME
Discussion
17777.

What is meant by selectivity of a catalyst ?

Answer»

SOLUTION :The catalytic reaction that depends upon the pore structure of the catalyst and the SIZE of the REACTANT and product molecules is called SHAPE selective CATALYSIS.
Discussion
17778.

When acetone is treated with excess of bezaldehyde in the presence of base, the crossed condensation add two equivalents of benzaldehyde and expets two equivalent of water and forms [x]. Identify the structure of [X] when [X] reacts with NH_(2)OH how many stereoisomers are formed .

Answer»


SOLUTION :
Discussion
17779.

While filling up of electrons in the atomic orbitals, the 4s orbital is filled before the 3d orbitals but reverse happens during the ionisation of the atom. Explain why?

Answer»

Solution :In an atom, ELECTRONS are filled according to (n+1) rule of INCREASING energy order. `3D rArr n =3, l= 2 rArr (n+l) = 5`
`4d rArr n =4, l= 0 rArr (n+l) = 4`
4s is lower in energy than 3d and so, electrons first enters in 4s orbitals. During ionization the electrons are first REMOVED from 4s-orbitals because electrons in 4s are loosely HELD by the nucleus.
Discussion
17780.

Which metal is used in Wurtz synthesis?

Answer»

Ba
Al
Na
Fe

Answer :C
Discussion
17781.

Which one of the strongest acid ?

Answer»

`ClO_3(OH)`
`ClO_2(OH)`
`SO(OH)_2`
`HCOO^-`

ANSWER :A
Discussion
17782.

Which is more basic among methyl amine and aniline?

Answer»

SOLUTION :METHYL AMINE
Discussion
17783.

Which of the following has highest freezing point ?

Answer»

0.01 M KCl
0.01 M GLUCOSE
0.01 M `CaCl_2`
0.01 M `KNO_3`

ANSWER :B
Discussion
17784.

What is chemcical kinetics?Which information is obtained by chemical kinetics for reaction and thermodynamics?

Answer»

Solution :information of chemical KINETICS:The WORD kinetics is derived from the Greek word .kinesis. meaning movement .The branch of chemistry which deals witth the study of reaction rates and their mechanism is called chemical kinetics.
By chemical kinetics the information of (i)rate of reaction (ii) Factors affecting rate of reaction (iii)Time to complete reaction is obtained.
Information of thermodynamics:(i)In thermodynamics it can be DETERMINE whether the reaction take place or not and if take place than the properties of reaction also determind .
(ii)The SPONTANEITY of reaction is also determined.If free entry change in process is negative and total entropy change in process is negative and total entropy change i.e system and SURROUNDING is positive than the reaction is spontaneous .(iii)The rate of reaction is not determind in thermodynamics.
Discussion
17785.

What will be the product for the foliowing reaction "Acetylchloride" underset((ii)H_3O^(+))overset((i)CH_3MgBr)toX overset("acid "K_2Cr_2O_7)toA. Identify X and A

Answer»

SOLUTION :`underset(("ACETYLCHLORIDE"))(CH_3COCl) underset((ii)H_3O^(+))OVERSET((i)CH_3MgBr)tounderset(("Acetone")(X))(CH_3COCH_3) overset(K_2Cr_2O_7//H^(+))tounderset(("Acetic ACID")(A))(CH_3COOH)`
Discussion
17786.

Why are cimetidine and ranitidine better antacids than sodium bicarbonate or magnesium or aluminium hydroxide ?

Answer»

Solution :If excess of sodium bicarbonate, `Mg(OH)_(2)` or `Al(OH)_(3)` is USED, it will make the stomach alkaline and trigger the production of EVEN more HCl which may cause ulcers in the stomach. In contrast, CIMETIDINE and ranitidine prevent the interaction of histamine with the receptor cells present in the stomach wall. This releases lesser amount of HCl.
Discussion
17787.

Which of the following will show optical activity? (E) 50/50 maxture of C and D

Answer»

A,D and E
A and E only
B, C and D
All expect C

Solution :(1) Compounds which do not have PLANE & centre of symmetry. Are opticlly active.
(2) 50/50 MIXTURE of diastereoisomers is also sptically active.
Discussion
17788.

When an oxide of manganese(A) is fused with KOH in the presenceof an oxidising agent and dissolvedin water, it gives a dark green solution of compound (B). Compound(B) disproportionates in neutralor acidic solution to give purple compound (C ). An alkaline solution of compound (C ) oxides potassium iodide solutionto a compound (D)and compound (A) is also formed.Identity compounds A to D andalso explain the reactions involved.

Answer»

Solution :`A=MnO_(2), B=K _(2)MnO_(4) , C=KMnO_(4) , D = KIO_(3)`
Reactions `: UNDERSET((A))(2MnO_(2))+4KOH + O_(2) rarrunderset((B))(2K_(2)MnO_(4)) + 2H_(2)O`
`3MnO_(4)^(2-)+ 4H^(+)rarr underset((C ))(2MnO_(4)^(-)) + MnO_(2)+2H_(2)O`
`2MnO_(4)^(-) + H_(2)O + KI rarr underset((A))(2MnO_(2))+ 2OH^(-) + underset((D))(KIO_(3))`
Discussion
17789.

Whatare the functionsof lipids is livingorganism ?

Answer»

Solution :1. Lipidsare theintegralcomponentof cell membrance . Theyare necessaryof structuralintegrityof the cell.
2 . The mianfunctionof triglyceridsin animalsis asan energyreserve. Theyyieldmoreenergythancarbohyratesand proteins .
3 They ACT as protectivecoatinginaquaticorganisms.
4. Lipidsof connective tissuegiveprotectioninternal ORGANS.
5 . Lipids help in theabsorptionand transport of fatsoluble vitamins .
6 . Theyare essential foractivationof enzymessuch as LIPASE.
7 . Lipids act as emulsifier in factmetabolsim
Discussion
17790.

The structural formula of 2-oxo-3-methyl-(N-bromo) butanamide is:

Answer»

`CH_(3)CH_(2)-CO-CO-NH-Br`
`CH_(3)-OVERSET(CH_(3))overset(|)(CH)-CO-CO-NH-Br`
`CH_(3)-CH-CO-CO-overset(CH_(3))overset(|)(NOBr)`
`(CH_(3))_(3)C-CO-CO-NH-Br`

ANSWER :B
Discussion
17791.

Which of the following reactioins yield elementary gases like N_(2), H_(2), O_(2) as the byproducts? I) 2NH_(3) +2Na to II) 8NH_(3)+3Cl_(2) to III) 2Pb (NO_(3))_(2) overset(Delta)to

Answer»

I and II only
II and III only
I and III only
All of these

ANSWER :4
Discussion
17792.

What is van't Hoff factor in each of the following cases? (A) Aq. K_(4)[Fe(CN)_(6)] which is 20% inosed (B) PCl_(5) which is 50% dissociated (C) Benzoic acid which forms dimer to the extents of 50% in benzene (D) Glucose solution

Answer»


Solution :(A)
`i`(van'tHOff factor) `=[1+(y-1)X]`
`1+4x=1+4xx0.2=1.8`
(B)
`i=[1+(y-1)x]=1+x=1+0.5=1.5`
(C) `2C_(6)H_(5)COOOHhArr(C_(6)H_(5)COOH)_(2)`
`C_(6)H_(5)COOHhArr(1)/(2)(C_(6)H_(5)COOH)_(2)`
`y=(y)/(2)`
Dimer formation is due to intermolecular `H-`bonding.

`i=[1+(y-1)x]=1-(x)/(2)=1-(0.5)/(2)`
`=0.75`
`i=1+(y-1)x,y(1)/(2)`
`i=1+((1)/(2)-1)xx=1-(0.5)/(2)`
(D) There is no CHANGE in the molecular STATE of glucose being a non-electolyte. Hence, `y=1
i=[1+(y-1)x]=1`
Discussion
17793.

What is the co-ordination number of an atom in each of the following types of cubic lattices ? (a) Primitive (b) Body centred.

Answer»

Solution :(a) In Primitive cubic lattice, each ATOM is in direct CONTACT with six other atoms. So the co-ordination number of primitive cubic lattice is 6.
(B) In body CENTRED cubic lattice, each atom is in direct contact with EIGHT other atoms, So the co-ordination number of body centred cubic lattice is 8.
Discussion
17794.

Which types of ores are concentrated by froth floatation method?

Answer»

SOLUTION :SULPHIDE ORES.
Discussion
17795.

When 2, 3 dimethyl 2-butanol under goes acid catalysed dehydration the minor product is,

Answer»

2, 3 DIMETHYL 1-butene
2, 3 dimethyl 2-butene
3, 3 dimethyl 1-butene
NONE of these

ANSWER :A
Discussion
17796.

When propene is chlorinated at 773 K, the product is :

Answer»

1, 2-dichloropropene
propylchloride
ALLYL chloride
1, 2-dichloropropane

ANSWER :C
Discussion
17797.

Which statement regarding H_3BO_3 is not correct ?

Answer»

It is a STRONG TRIBASIC acid
It is prepared by acidifying an AQUEOUS solution of borax
It has a layer structure in which PLANAR `BO_3` units are joined by H-bonds.
It does not act as PROTON donor but acts on Lewis acid by accepting `OH^-` ions

Answer :A
Discussion
17798.

Which of the following speces would you expect to obtain when P-creaol is subjected to Reimer-Tiemann reaction.

Answer»




ANSWER :B,C
Discussion
17799.

When one coulomb of electricity is passed through an electrolytic solution, the mass deposited on the electrode is equal to

Answer»

EQUIVALENT WEIGHT
MOLECULAR weight
ELECTROCHEMICAL equivalent
one gram

Answer :C
Discussion
17800.

Which of the following isomerism is exhibited by the complexes, [Co(gly)_(3)] ?

Answer»

GEOMETRICAL
OPTICAL
Linkage
Both (a) and (B)

ANSWER :D
Discussion