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8151.

Which of the following statements are correct about barbiturates ?

Answer»

Hypnoties or SLEEP producing agents
These are tranquilizers
Non-narcotic analgesics
Pain reducing WITHOUT disturbing the NERVOUS system.

Answer :A::B
Discussion
8152.

Which of the following is a correct name according to IUPAC rules ?

Answer»

2,3-Diethylhexane
3-Ethyl1-2-methylpentane
3,4-Dimethylpentane
2-Ethyl-2-methypentane

ANSWER :B
Discussion
8153.

Which one of the following on ozonolysis followed by oxidation will give adipic acid

Answer»




SOLUTION :
Discussion
8154.

What is the range of adsorption enthalpy in kJ mol^(-1) for physical adsorption ?

Answer»

40-400
40-100
10-40
1-10 

ANSWER :C
Discussion
8155.

The starting material used for the manufacture of HNO_(3) by Ostwald process is

Answer»

Ammonia and `N_(2)O`
Ammonia and AIR
Air only
Ammonia and nitrogen

Answer :2
Discussion
8156.

What is meant by disproportionation? Give two examples of disproportionation reactionin aqueous solution.

Answer»

Solution :See ANSER
Similarly , Cr(V) undergoes disproportionation in acidic medium as FOLLOWS `:`
`overset(V)(C) rO_(4)^(3-) + 8H^(+) rarr 2 overset(VI) (Cr) O_(4)^(2-) + 4H_(2)O`
Discussion
8157.

Under the same reactions conditions , initial concentration of 1.386 mol dm^(-3) of a substance becomes half in 40 seconds and 20 seconds through first order and zero order kinetics , respectively . Ratio (k_(1))/(k_(0)) of the rate constants for first order (k_(1)) and zero order (k_(0)) of the reactions is

Answer»

`0.5 mol^(-1) dm^(-3)`
`1.0 mol dm^(-3)`
`1.5 mol dm^(-3)`
`2.0 mol^(-1) dm^(-3)`

Solution :For first ORDER `(t_(1//2))_(1) = (0.693)/(k_(1)) implies K_(1) = (0.693)/((t_(1//2))_(1))`
for zero `(t_(1//2))_(0) = (A_(0))/(2k_(0)) implies k_(0) = (A_(0))/(2(t_(1//2))_(0))`
`(K_(1))/(K_(0)) = (0.693 xx 2(t_(1//2))_(0))/((t_(1//2))_(1)A_(0)) implies (K_(1))/(K_(0)) = (0.693)/(1.386) = 0.5 mol^(-1) dm^(3)`.
Discussion
8158.

What is aspartame and what is its use ?

Answer»

SOLUTION :It is the methyl ESTER of the dipeptide DERIVED from phenylalanine and aspartic acid. It is used as an ARTIFICIAL sweetener.
Discussion
8159.

Which electrolyte is least effective in causing coagulation of +ve ferric hydroxide sol?

Answer»

Kbr
`K_(2)SO_(4)`
`K_(2)CrO_(4)`
`K_(3)[Fe(CN)_(6)]`

ANSWER :A
Discussion
8160.

Which of the following opertions performed on the figuration of (S)-butan-2-ol has no effect?

Answer»

Exchaging ligands acorss the horizontal bond
Exchanging ligands acorss the vertical bond
Making both switches`(1)` and `(2)`
Exchanging a vertical and horizotanl ligand

Solution :No change as it is equivalent to a `180^(@)` rotation in the plane of the paper.

NOTE that a `180^(@)` horizontal or vertical rotation outside of the plane of the paper is not allowed because in any flipping out of the plane of the paper (side-to-side or top-to-bottom) the ligands formely projecting behind the plane of the paper end up projecting towards the VIEWER and those of formely pointing to the viewer end up behind the plane of the paper.
Similarly a `90^(@)` rotation in the plane of the paper is not allowed.

Writing `I` as `II` PRESUMES that the `H` and `OH` project behind the plane, but a `90^(@)`(or any other) rotation in the plane does not chnage the projection of bonds towards or away from the viewer.
Discussion
8161.

What is the end product in the following sequence of reactions, C_2H_5NH_2 overset (HNO_2) rarr A overset (PCl_5) rarr B overset (NH_3) rarr C

Answer»

ETHYL cyanide
Ethylamine
Methylamine
Acetamide

Answer :B
Discussion
8162.

Two moles of an ideal gas are held by a piston under 10 atm pressure at 273 K. The pressure is suddenly released to 0.4 atm and the gas is allowed to expand isothermally. Calculate W,qDeltau and DeltaH.

Answer»


SOLUTION :The GAS EXPANDS IRREVERSIBLY)
Discussion
8163.

When two colourless solutions are mixed, it results a white precipitate. The two solutions are of

Answer»

Copper SULPHATE and sodium carbonate
Sodium carbonate and CALCIUM nitrate
ferrous sulphate and calcium nitrate
sodium chloride and sodium carbonate

Solution :`CaCO_(3)` is formed as dense WHITE PPT.
Discussion
8164.

The total number of optically active isomers of [Pt(en)_(2)Cl_(2)]^(2+) is :

Answer»

2
3
4
6

Solution :
Discussion
8165.

The work done by a system is 8 J, when 40 J heat is supplied to it. The change in internal energy of the system during the process:

Answer»

32 J
40 J
36 J
44 J

Answer :A
Discussion
8166.

Which of the following compounds is optically active?

Answer»

`CH_(3) - CH_(2) - CH_(2) OH`

`CH_(3) underset(Cl)underset(|)(CH) CH_(3)`
`CH_(3) - CH_(2) - CH_(3)`

Answer :B
Discussion
8167.

which of the following is not a use of Epsom salt?

Answer»

As a purgative
As a MORDANT in dyeing
As a stimulant to INCREASE the SECRETION of bile
For removal of SULPHUR from petroleum

Solution :Epsom SALT is not used for removal of sulphur from petroleum.
Discussion
8168.

Which one of the following elements will replace hydrogen from acids to form salts ?

Answer»

Sulphur (S)
Silicon (Si)
Zinc(Zn)
PHOSPHORUS (P)

Solution :Among the GIVEN OPTION only zinc is more reactive than hydrogen hence it will replace hydrogen from acid to form salt i.e.,
`Zn + H_(2)SO_(4) to NnSO_(4) + H_(2)`.
Discussion
8169.

Which of the following does not undergo Cannizzaro reaction?

Answer»

Benzaldehyde
2 - Methylpropanal
p - Methoxybenzaldehyde
2, 2 - Dimethylpropanal

Solution :Aldehydes containing no `alpha`-H atoms on heating with concentrated alkali solution `(50%)` UNDERGO CANNIZZARO's reaction. In this reaction one molecule is oxidised at the EXPENSE of other which is reduced to alcohol.
Discussion
8170.

Which of the following reagents can be used to convert acetamide into methanamine ?

Answer»

`P_(2)O_(5)`
`NaOBr`
`LiAlH_(4)//H_(2)O`
`Na(Hg)//C_(2)H_(5)OH`.

Solution :NaOBr is USED to convert acetamide to methanamine by Hofmann bromamide REACTION
`CH_(3)CONH_(2)NaOBr underset(NaOH)OVERSET(Br_(2))(rarr) CH_(3)NH_(2)+NaBr+CO_(2)`
NaOBr serves as the attacking apecies.
Discussion
8171.

Which of the following statement is wrong with regard to galvanic cell?

Answer»

REDUCTION TAKES PLACE at cathode
Reduction takes place at anode
Oxidation takes place at anode
Cathode is POSITIVELY charged

Answer :B
Discussion
8172.

What amount of urea dissolved in 1 kg water at constanttemperature ,so that vapour pressure of the solution reduced by 2% ? ( MV of urea= 60 gm // mole)

Answer»

<P>68 gm
60gm
50 gm
75 gm

Solution : `Delta P= ( 2P^(0))/( 100)`
`:. (Delta P)/( P^(0)) =(1)/(50) =X ` ( mole fraction of urea )
`= ( m )/( 55.55 + m ) `
`:. M= 1.134 ` ( malality of urea )
`:. `Mass of urea `( W_(2)) = 1.134 xx 60 = 68 gm`
Discussion
8173.

Xenon directly combines with :

Answer»

OXYGEN
Rubidium
Fluroine
Chlorine

Answer :C
Discussion
8174.

Write the electronic configuration of group 15 elements

Answer»

Solution :Nitrogen `(""_(7)N) : (He)^2 2s^2 2p^3 ,`
Phosphours `(""_(15)P) : (Ne)^(10)3s^2 3p^3`
Arsenic `(""_(33)As) , (Ar)^(18) 3D^(10)4s^(2)4p^(3)` :
Antimony `(""_(51) Sb) : (Kr)^(36)4d^(10)5s^(2)5p^(3)`
Bismuth `(""_(83)Bi) : (Xe)^(54) 4f^(14)5d^(10)6S^(2)6p^(3)`
Discussion
8175.

When phenol is treated with propan-2-ol in the presence of HF, Friedel-Craft reaction takes place. Identify the products.

Answer»

SOLUTION :
Discussion
8176.

Which of the following statements about the halogen is INCORRECT ?

Answer»

They are all diatomic and form univalent ions.
They are all diatomic and form divalent ions.
All SHOW VARIABLE oxidation state.
All possess LOW melting point and boiling point

Answer :B
Discussion
8177.

Whichof thefollowingalkanescan besynthesised in goodyieldby theWurtz reaction?

Answer»

`(CH_(3))_(2) CH-CH_(2) -CH(H_(3))_(2)`
`(CH_(3))_(2) CH-CH_(2) CH_(2) -CH(CH_(3))_(2)`
` CH_(3) CH_(2) -C-(CH_(3))_(2)-CH_(2)CH_(3) `
`(CH_(3))_(3) C-CH_(2) -CH_(2) -CH_(3)`

ANSWER :B
Discussion
8178.

The salt generally used in the salt bridge of electrochemical cell ?

Answer»

`KCL`
`KNO_(3)`
`NH_(4)NO_(3)`
allof these

Solution :A salt BRIDGE is U-shaped glass tube filled with JELLY like substance , agar-agar mixed with an ELECTROLYTE like `KCl , KNO_(3) , NH_(4) NO_(3)` etc.
Discussion
8179.

What is the value of co-ordination number of Fe in K_(4)[Fe(CN)_(6)]

Answer»

Solution :Coordination NUMBER of `FE` in `k_(4)[Fe(CN)_(6)]` is 6.
Discussion
8180.

Which of the following complexes would exhibit only geometrical isomerism ?

Answer»

`[Co(NH_(3))_(4)Cl_(2)]`
`[Cr(gly)_(3)]`
`[CoF_(6)]^(3-)`
`[Pt(en)_(2)]^(2+)`

SOLUTION :`Ma_(4)b_(2)`
M (aa) (aa) (bb)
M (aa) (ab) (ab)
Discussion
8181.

When 3 - methylbutan -2- ol is treated with HBr, the following reaction takes place : CH_(3)-underset(CH_(3))underset("|")"CH"-underset(OH)underset("|")"CH"-CH_(3)overset(HBr)rarrCH_(3)-overset("Br")overset("|")underset(CH_(3))underset("|")"C "-CH_(2)-CH_(3) Give a mechanism for this reaction.

Answer»

Solution :Protonation of the given ALCOHOL followed by loss of water gives a `2^(@)` CARBOCATION (I) which rearranges by 1,2- hydride SHIFT to form the more stable `3^(@)` carbocation (II). Nucleophilic attack by `Br^(-)` ION on this carbocation (II) gives the final product.
Discussion
8182.

The specific conductance of a 0.1 N KCl solution at 23^(@)C is 0.012 ohm^(-1)cm^(-1). The resistance of cell containing the solution at the same temperature was found to be 55 ohm. The cell constant will be

Answer»

0.142 `CM^(-1)`
0.66 `cm^(-1)`
0.918 `cm^(-1)`
1.12 `cm^(-1)

Solution :`K=(1)/(R)xx`CELL CONSTANT
Cell constant`=KxxR,0.012xx55=0.66cm^(-1)`
Discussion
8183.

What are transition metals? Give four examples

Answer»

Solution :(i) Transition metal is an element whose atom has an incomplete d sub shell or which can GIVE rise to CATIONS with an incomplete d sub shell.
(ii) They occupy the central position of the periodic table, between s-block and p-block elements.
(iii) Their PROPERTIES are transitional between highly reactive metals of s-block and elements of p-block which are mostly non metals.
(iv) Example: IRON, Copper, Tungsten, TITANIUM
Discussion
8184.

Which would be obtained by boiling CHCl3 with dilute KOH?

Answer»

`CH_(3)`COOK
HCOOK
`K_(2)C_(2)O_(4)`
`CH_(3)`OH

Answer :B
Discussion
8185.

Which on heating with conc H_2SO_4 gives violet vapours

Answer»

iodide
Nitrate
Sulphate
Bromide

Answer :A
Discussion
8186.

Write the structure of Chloric acid (HClO_3)

Answer»

SOLUTION :The STRUCTURE of CHLORIC ACID is
Discussion
8187.

Which of the following carbonates decomposes on heating ?

Answer»

`MgCO_(3)`
`Na_(2)CO_(3)`
`K_(2)CO_(3)`
`Rb_(2)CO_(3)`

Solution :`MgCO_(3) overset("Heat")to MGO +CO_(2)`
The METAL whose oxide is stable it's CARBONATE is unstable .
Discussion
8188.

Which of the following is an example of acidic amino acid?

Answer»

`CH_3-UNDERSET(COOH)underset(|)(CH)-NH_2`
`CH_3-underset(H)underset(|)overset(CH_2COOH)overset(|)(C )-underset(COOH)-NH_2`
`underset(NH_2)underset(|)(CH_2)-COOH`
`NH_2 - COOH`

Answer :B
Discussion
8189.

Which of the following reactions is given only by primary amines ?

Answer»

Reaction with `HONO`
Reaction with CHLOROFORM and ALCOHOLIC `KOH`
Reaction with acetyl chloride
Reaction with GRIGNARD reagent.

Answer :B
Discussion
8190.

What is the meant by strong acid and weak acid? Explain with example.

Answer»

SOLUTION :(i) A STRONG acid is the one that is almost COMPLETELY dissociated in WATER.
`HCL+H_2O to H_3O^(+) + Cl^-`
(II) A weak acid is the one that is partially dissociated in water.
`CH_3COOH+H_2O leftrightarrow H_3O^(+)+ CH_3COO^-`
Discussion
8191.

What is the oxidation number of Ti, whose magnetic moment is 1.73BM?

Answer»

`+3`
`+2`
`+1`
`+4`

ANSWER :A
Discussion
8192.

The series limit for Balmer series of H-spectra is………

Answer»

3664
3800
4000
4200

Answer :A
Discussion
8193.

What are narcotic and non-narcotic analgesics ? Give one example of each.

Answer»

SOLUTION :Non-narcotics are the drugs which RELIEVE or decrease PAIN without causing unconsciousness. Example, Aspirin.
Nartotics analgesics are those drugs which relieve pain, but produce SLEEP and unconsciousness. Example, Morphine.
Discussion
8194.

Which of the following is the most boric oxide

Answer»

`SeO_2`
`Al_2O_3`
`Sb_2O_3`
`Bi_2O_3`

ANSWER :A
Discussion
8195.

What is denaturation of proteins ?

Answer»

Solution :On heating or on treatment with mineral acids, ELECTROLYTES etc. the WATER soluble globular proteins undergo COAGULATION RESULTING in the loss of biological activity to give water FIBROUS proteins. This process is called denaturation of proteins.
Discussion
8196.

Which of the following compounds represents an analgesic?

Answer»




Solution :2-Acetoxy BENZOIC ACID, commonly KNOWN as .asprin. acts as an analgesic.
Discussion
8197.

Which conformational state of n-butane lies in higher energy state when rotated along C_(2)-C_(3) bond?

Answer»


ANSWER :FULLY ECLIPSED
Discussion
8198.

Which of the following is(are) true for real gases? (C represents some constant value of R represents molar gas constant).

Answer»

`lim_(pto0)(pV)=C` at constant temperature
`lim_(Vto0)(pV)=C`s at constant temperature
`lim_(Pto0)((pV)/(RT))=1`
`lim_(Vto0)((pV)/(RT))=R`

Answer :A::C
Discussion
8199.

Which of the following gives N_2(g) on heating ?

Answer»

`NH_(4)NO_(2)`
`NH_(4)NO_(3)`
`(NH_(4))_(2)Cr_(2)O_(7)`
Both a and c

Answer :D
Discussion
8200.

Write the relavant chemical equations : Aniline to chlorobenzene

Answer»

SOLUTION :
Discussion