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7501.

When conc. H_(2)SO_(4), in added to dry KNO_(3), brown fumes are evolved. These fumes are

Answer»

`SO_2`
`SO_3`
`N_2O`
`NO_2`

ANSWER :D
Discussion
7502.

Which of the following will not do coupling reaction with benzene diazonium chloride ?

Answer»

ANILINE
Phenol
2-Naphthol
Benzyl alcohol

Answer :C
Discussion
7503.

Which is the strongest oxidising agent among ClO_4^(-), BrO_4^(-) and IO_3^(-) ?

Answer»

SOLUTION :`BrO_4^(-)` is the STRONGEST OXIDISING AGENT.
Discussion
7504.

Treatment of ammonia with excess of ethyl iodide will yield:Diethylamine,Ethylamine,Triethylamine,Tetraethyl ammonium iodide.

Answer»

Diethylamine
Ethylamine
Triethylamine
Tetraethyl AMMONIUM iodide

Answer :D
Discussion
7505.

Which of theseis a necessary characteristicof wave function (Psi)

Answer»

It must be a FINITE function
It must be SINGLE VALUED
It must be a CONTINOUS function
all of the statement above are correct

ANSWER :D
Discussion
7506.

Which one of the following gives amine on heating with amide?

Answer»

`Br_(2)` in AQUEOUS KOH
`Br_(2)` in alcoholic KOH
`Cl_(2)` is sodium
Sodium in ether

Solution :Only treatment of amide with `Br_(2)` in aqueous solution of Na or KOH will give an amine with lesser no. of carbon atoms than in the reactant.
`underset("Amide")(R-CONH_(2)) underset(underset("degradation")("Hofmann bromamide or"))OVERSET(Br_(2)//KOH, Delta)RARR underset("Amine")(R-NH_(2))`
Discussion
7507.

What is the mole fraction of the solute in a 1.00 m aqueous solution ?

Answer»

`0.0354`
`0.0177`
`0.177`
`1.770`

Solution :1.00 m solution means 1 MOLE solute is present in 1000 G water.
`n_(H_(2)O)=(1000)/(18)=55.5 mol H_(2)O`
`X_("solute")=(n_("solute"))/(n_("solute")+n_(H_(2)O))=(1)/(1+55.5)=0.0177`
Discussion
7508.

Why are lyophillic colloidal sols are more stable than lyophobilc colloidal sol?

Answer»

Solution :(i) A lyophilic colloidal sols are STABLE due to the charge and the HYDRATION of sol particles.
(II) Lyophilic sols are more stable than lyophobilc sols because they are highly HYDRATED in the solution. And since more is the hydration more will be its stability.
(iii) Lyophilic sols are stabilized by electrostatic charge and hydration where as lyophobilc sols are only stabilized by charge, so they easily gets coagulated and requires a stabilising AGENT.
Hence, lyophilic sols are more stable than the lyophobilc sols.
Discussion
7509.

Why are vitamin A and vitamin C essential to us? Give their important sources.

Answer»

Solution :Vitamin A is essential as its DEFICIENCY CAUSES xerophthalmia (hardening of cornea of EYE) andnight blindness.
Vitamin C is essential as its deficiency causes SCURVY (bleeding gums) and pyorrhoea (loosening and bleeding of teeth).
Sources: Citrus fruits, amla, green leafy VEGETABLES.
Discussion
7510.

Which of the following reactions does not take place during rusting ?

Answer»

`H_(2)CO_(3) hArr 2H^(+) + CO_(3)^(2-)`
`4Fe^(2+) + O_(2"(dry)") to Fe_(2)O_(3)`
`4Fe^(2+) + O_(2) + 4H_(2)O to 2Fe_(2)O_(3) + 8H^(+)`
`Fe_(2)O_(3)+xH_(2)O to Fe_(2)O_(3) . xH_(2)O`

Solution :`Fe^(2+)` ion does not react with dry OXYGEN.
Discussion
7511.

Which one of the following is used as a catalyst in the reaction of methanol with thionyl chloride ?

Answer»

PYRIDINE
PYRROLE
THF
Nickel

Solution :Pyridine
Discussion
7512.

Which of the following is purified by sublimation ?

Answer»

Naphthalene
Benzoic acid
Camphor
All

Answer :D
Discussion
7513.

What is the weight of one atom of Hydrogen in grams ?

Answer»

`6.023xx10^(-23)`
`1.66xx10^(-24)`
`6.62xx10^(-24)`
None of these

Solution :WEIGHT of one ATOM of HYDROGEN `= (1)/(6.02xx10^(23))g`
`=1.66xx10^(-24)g`
Discussion
7514.

Which is the product, when benzene reacts with fuming H_(2)SO_(4) ?

Answer»

PHENOL
BENZENE sulphonic ACID
Benzene sulphonate
Acetone

Answer :B
Discussion
7515.

Write the matflematical form of Ra.oult' s law of relative lowering of vapour pressure.

Answer»

Solution :`(P^(0) - P)/(P^(0)) = (n_(2))/(n_(1) + n_(2)) (or) (P^(0) - P)/(P^(0))= X_(B)`
(or) mole FRACTION of SOLUTE
`(P_(A)^(0) - P_(S))/(P_(A)^(0)) = (n_(2))/(n_(1) + n_(2))`.
Discussion
7516.

Which of the following is the correct order of ionic radii

Answer»

`FgtLigtNagtK`
`FgtKgtNagtLi`
`NagtKgtFgtLi`
`LigtNagtKgtF`

ANSWER :B
Discussion
7517.

The repeating unit of polyethyl acrylate is :

Answer»

`-CH_2-UNDERSET(OC_2H_5)underset(|)(CH)-`
`-CH_2-underset(C_6H_5)underset(|)(CH)-`
`-CH_2-underset(COOC_2H_5)underset(|)(CH)`
`-CH_2-underset(COOCH_3)underset(|)(CH)-`

ANSWER :C
Discussion
7518.

Trien is

Answer»

HEXA DENTATE, MONO anianic
evadentate, dianion
tetradentate, neutral
Mono dentate, anion

Answer :B
Discussion
7519.

Which is the structural formula of ''Chloral'' ?

Answer»

`C_(6)H_(5)-overset("H")overset("|")UNDERSET(CL-underset("Cl")underset("|")("C")-Cl)underset("|")("C")-C_(6)H_(5)`
`Cl-overset("Cl")overset("|")underset("Cl")underset("|")("C")-underset(O)underset("||")("C")-H`
`Cl-overset("Cl")overset("|")underset("Cl")underset("|")("C")-underset(O)underset("||")("C")-CH_(3)`
`CH_(3)-underset(O)underset("||")("C")-overset("Cl")overset("|")underset("H")underset("|")("C")-Cl`

Solution :CHLORAL : M.F. `C Cl_(3)CHO`
and
Structure : `Cl-overset("Cl")overset("|")underset("Cl")underset("|")("C")-underset(O)underset("||")("C")-H`
Discussion
7520.

Which ofthe following is associated liquids?

Answer»

ROH
`H_2O`
`RNH_2`
All of these

Answer :D
Discussion
7521.

Which one of the following is a neutral complex ?

Answer»

`[Co(NH_(3))_(3)(Cl_(3))]`
`[Ag(NH_(3))_(2)]^(+)`
`K_(4)[Fe(CN)_(6)]`
`Na[Ag(CN)_(2)]`

ANSWER :A::C
Discussion
7522.

Which of the following synthetic routes may be employed to prepare the following aryl ether ?

Answer»




Both (a) and (B) will work

Answer :A
Discussion
7523.

The vapour pressure of a solvent decreased by 10 mm. of Hg when a non-volatile solute was added to the solvent. The mole fraction of solute in solution is 0.2, what would be the mole fraction of solvent if decrease in vapour pressure is 20 mm of Hg:

Answer»

0.8
0.6
0.4
0.2

Answer :B
Discussion
7524.

When 30.0 gof a non - volatilesolute havingthe empirical fromual CH_(2)Oare dissolvedin 800g of water, thesolutionfreezes at- 1.16^(@)C . Whatis the molecularformula of the solute ? (k_(f)for water = 1.86 K m^(-1))

Answer»


Solution :`M_(B)= (k_(F) xx w_(B) xx 1000)/(w_(A) xx Delta T_(f))= (1.86 xx 30.0 xx 1000)/(800 xx 1.16)`
`M_(B) = 60.1`
` n = ("Mol.formula MASS")/("Empirical FORMUAL mass") = (60)/(30) = 2`
MOLECULAR formual ` = (CH_(2)O)_(2) = C_(2)H_(4)O_(2)` .
Discussion
7525.

Which halogen has highest electron gain enthalpy?

Answer»

Solution :Chlorine has the highest electron GAIN enthalpy among the HALOGENS. This is because the interelectronic REPULSIONS in chlorine are weaker than in F due to bigger SIZE of chlorine.
Discussion
7526.

What fraction of a rectant showing first order remains after 40min, if t_(1//2) is 20min?

Answer»

`1//4`
`1//2`
`1//8`
`1//6`

ANSWER :D
Discussion
7527.

Which of the following compounds represents an analgesic ?

Answer»




Solution :2-Acetoxy benzoic ACID , COMMONLY KNOWN as 'aspirin' ACTS as an ANALGESIC.
Discussion
7528.

Which of the following represents ferric alum:

Answer»

`Al_2(SO_4)_3FeSO_4 6H_2O`
`FeSO_4(NH_4)_2SO_4 24H_2O`
`FE(SO_4)_3(NH_4)_2SO_4 24H_2O`
`FeSO_4(NH_4)_2SO_4 6H_2O`

ANSWER :C
Discussion
7529.

The value of K for the reaction :2A(g)hArr B(g)+C(g)+ Heat at 750 K and 10 atm is 3.96. The value of K at 750 K and 15 atm is :

Answer»

`5.94`
`2.97`
`3.96`
`2.64`

ANSWER :C
Discussion
7530.

The synthesis of alkyl fluorides is best accomplished by

Answer»

Finkelstein reaction
SWARTS reaction
Free RADICAL fluourination
Sandmeyer's reaction

Solution :Swarts reaction is used to PREPARE ALKYL FLUORIDES.
Discussion
7531.

The total number of alphaandbeta particles emitted in the nuclear reaction ""_(92)^(238)Uto""_(82)^(214)Pb is

Answer»


SOLUTION :`._(92)^(238)Urarr._(82)^(214)Pb +x._(2)He^(4)+y ._(-1)E^(0)`
Applying mass number balance
`238=214 +4x "" x=6`
Applying nuclear CHARGE balance
`92=82+2x-y`
`92=82+12-y`
`y=2`
Total no. of `alpha` & `beta` particle emitted=8
Discussion
7532.

Which of the following acid has smallest dissociation constant ?

Answer»

`CH_(3) - CHFCOOH`
`BrCH_(2)CH_(2)-COOH`
`F - CH_(2) - CH_(2) - COOH`
`CH_(3) - CHBr - COOH`

ANSWER :B
Discussion
7533.

Which of the following has regular octahedral geometry?

Answer»

`SbCl_(6)^(3-)`
`XeF_(6)`
`IF_(6)^(-)`
`PF_(3)Cl_(3)^(-)`

SOLUTION :Regular octahedral geometry =
`XeF_(6)`= DISTORTED octahedral structure
`IF_(6)^(-)` = Distorted octahedral structure LTBRGT `PF_(3)Cl_(3)^(-)` = Distorted octahedral geometry
`PF_(3)Cl_(3)^(-)` does not have identical SURROUNDING atoms
Discussion
7534.

When temperature is increased, will ionic product of water increase or decrease? Give reason to justify your answer.

Answer»

Solution :With INCREASES in TEMPERATURE the ionic product of WATER will increases since the concentration of `H_3O^+ and OH^-` ions will increase.
Discussion
7535.

Which of the following is analgesic?

Answer»

PENICILLIN
Ibuprofen
Ampicllin
Tetracyline

Answer :B
Discussion
7536.

Which of the following has the greater entropy? (a) CaCO_(3(s)) (b) CO_(2(g))

Answer»

SOLUTION :`CO_(2)` being a gas, it has MAXIMUM disorder as COMPARED to solid `CaCO_(3)`. HENCE `CO_(2)` has higher entropy.
Discussion
7537.

What is the value of Van't Hoff factor for dilute Ferrous sulphate (aqueous) solution ?

Answer»

`lt 1`
Zero
`GT 1`
1

Solution :`FeSO_(4)overset(" Water ")rarr underset("TOTAL 2 ions")(ubrace(Fe_((AQ))^(2+)+SO_(4(aq))^(-2))`
`therefore i=` Van.t Hoff factor `gt 1`
Discussion
7538.

Which of the following noble gases is used in miner's cap lamps ?

Answer»

Helium
Neon
Argon
KRYPTON

Solution :Krypton is used in MINERS' cap lamps because its LIGHT does not PRODUCE glare.
Discussion
7539.

Which of the following pair of thespecieshas the samepercentage of carbon

Answer»

`CH_(3)COOH` and `C_(2)H_(5)OH`
`C_(6)H_(12)O_(6)` and `C_(12)H_(22)O_(11)`
`HCOOCH_(3)` and `C_(12)O_(22)O_(11)`
`CH_(3)COOH` and `C_(6)H_(12)O_(6)`

SOLUTION :`CH_(3)COOH` and `C_(6)H_(12)O_(6)` both have same percentage of carbon i.e, `40%`
Discussion
7540.

Which of the statements is correct

Answer»

`SN^2`reactivity of alkyl halides is MAINLY controlled by steric factors<BR>`SN^2` reactions are more favourable in polar protic solvents
`SN^2`reactivity order of alkyl halides is RI gt RBR gt RCI
Both A &C

Solution :Bimolecular, primary and super primary alkyl halides `H_3e - x gt 1^@ gt 2^@ gt 3^@. R - 1gt R - Br gt RCl`
Discussion
7541.

Which of the following statements are correct about Zn, Cd & Hg ?

Answer»

They exhibit high ENTHALPIES of ATOMIZATION as the d-subshell is full
ZN, Cd do not show variable valeney while HG shows +1 and +2 oxidation states
Compounds of Zn, Cd and Hg are paramagnetic in nature
Zn, Cd and Hg are called soft metals

Solution :Zn,Cd, Hg has electronic configuration`= (n-1)d^(10) NS^(2)`
Discussion
7542.

What is the energy gap between valence band and conduction band in crystal of insulators ?

Answer»

Both the bands are overlapped with each other
Very small
infinite
very large

Solution :When insulators (non metal atoms) interact to FORM a SOLID, their ATOMIC orbitals mix to form TWO bunch of orbials, t separated by a large band gap. Electrons cannot therefore be promoted to an empty level, where they could move FREELY.
Discussion
7543.

The term anomers of glucose refers to:

Answer»

ISOMERS of glucose that differ in CONFIGURATION at CARBONS one and FOUR (C-1 and C-4)
a mixture of (D)-glucose and (L)-glucose
enantiomers of glucose
isomers of glucose that differ in configuration at CARBON one (C-1)

Answer :D
Discussion
7544.

Which of the following compound is the most basic ?

Answer»




ANSWER :B
Discussion
7545.

The triatomic species of elemental oxygen is known as

Answer»

AZONE
Polyzone
Triozone
Ozone

Answer :D
Discussion
7546.

Which is maximum reactive towards water ?

Answer»

Li
K
Na
Rb

Answer :D
Discussion
7547.

Which of the following thermal stability order is not correct :-

Answer»

`NaHCO_(3) LT KHCO_(3) lt RbHCO_(3)`
`CaO_(2) gt SrO_(2) gt BaO_(2)`
`Na_(2)SO_(4) gt MgSO_(4) gt Al_(2)(SO_(4))_(3)`
`C Cl_(4) gt SiCl_(4) gt GeCl_(4) gt SnCl_(4)`

Solution :For polyatomic anion
Thermal stability `prop ("size of CATION")/("charge of cation")`
Discussion
7548.

When a coordination compound CrCl_(3), 4H_(2)O is mixed with silver nitrate solution, one mole of silver chloride is precipitated per mole of the compound. There are no free solvent molecules in that compound. Assign the secondary valence to the metal and write the structural formula of the compound.

Answer»

Solution :`(i)` When a coordination compound `CrCl_(3).4H_(2)O` is mixed with silver nitrate solution, one mole of silver chloride is precipitated per mole of the compound. This shows `CrCl_(3).4H_(2)O` complex compound contains one `CI^(oplus)` counter ion.
`(ii)` Therefore are no free solvent molecules in `CrCl_(2).4H_(2)O` compound, this shows water molecules are coordinated with central metal ion.
`(iii)` Therefore, coordination complex is `[CrCl_(2).4H_(2)O]Cl`
Secondary value of the central metal ion is `2Cl^(oplus)` and `4H_(2)O`. Hence coordination number is`6`.
`(IV)` Wener.s structure of `[CrCl_(2).(H_(2)O)_(4)]Cl`
Discussion
7549.

Which of the following statements for a meso compound is/are correct ?

Answer»

The MESO compound has either a plane or a point of symmetry
The meso compound has at LEAST one PAIR of similar stereocenters
The meso compound is achiral
The meso comopound is formed when equal AMOUNTS of two enantiomers are mixed

Answer :A::B::C
Discussion
7550.

Whatare essential and non - essentialaminoacids ? Giventwo examples of each .

Answer»

Solution :Essential AMINO acids are thosewhichare notproduced in OURBODY butthey MUSTBE a PART of ourdiet. For example ,valineand leucine etc.
Non -essential amino acidsare thosewhichare produced by our bodies . For example, glycineandalanine .
Discussion