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19801.

Write structures of the compound whose IUPAC names are as follows : 3,5-Dimethylhexane-1,3,5-triol

Answer»

SOLUTION :`UNDERSET(OH)underset(|)CH_2-CH_2 - underset(OH)underset(|)OVERSET(CH_3)overset(|)C-CH_2 - underset(OH)underset(|)overset(CH_3)overset(|)C-CH_3`
Discussion
19802.

Write the structure of 2-chloro-3-methylpentane.

Answer»

Solution :`CH_(3)-underset(2)overset(CL)overset(|)(C)H-underset(3)overset(CH_(3))overset(|)(C)H-CH_(2)CH_(3)`2-chloro-3-methylpentane.
Discussion
19803.

Which of the following is correct order : Rate of decarboxylation

Answer»

<P>p,Q
r,s,t
p,q,r,s
p,q,u

Answer :D
Discussion
19804.

Which of the following is insoluble in water

Answer»

`Na_(2)CO_(3)`
`CaCO_(3)`
`ZnCO_(3)`
`Al_(2)(CO_(3))_(3)`

Solution :`Al_(2)(CO_(3))_(3)` is less soluble in water than `Na_(2)CO_(3),ZnCO_(3)`
Discussion
19805.

Which of the followingstatements are TRUE ?

Answer»

PHENOL is called CARBONIC acid
All monohydricalcohols are primary alcohols.
Boilingpoint ofethersare MUCH lowerthan ISOMERIC alcohols.
Phenols can be PREPARED by Williamson's synthesis.

Answer :C
Discussion
19806.

Whichof thefollowing noble gases is the least polarisable ?

Answer»

He
Ne
Kr
Rn

Answer :A
Discussion
19807.

Which one of the following is formed when acetaldehyde is warmed with dilute NaOH?

Answer»

But – 2 - ENAL
BUTAN - 1 - al
3 – HYDROXY BUTANAL
2 - hydroxybutanoic ACID

Solution :3 – hydroxy butanal
Discussion
19808.

Write the formula for sulfanilic acid and mention any one of its uses.

Answer»

SOLUTION :
It is USED in the MANUFACTURE of DYES and DRUGS.
Discussion
19809.

What is the test to differentiate between pentan - 2- one and pentan - 3 -one ?

Answer»

Iodoform TEST
Benedict's test
Fehling's test
Aldol condensation

Solution :`CH_(3)CH_(2)-underset(O)underset("||")C-CH_(2)CH_(3)+I_(2)+NAOH to `No reaction
`CH_(3)CH_(2)CH_(2)-underset(O)underset("||")C -CH_(3)+I_(2)+NaOH to underset("YELLOW ppt.")(CHI_(3))`
Discussion
19810.

Which of the following metals can easily be cut with a knife?

Answer»

Magnesium
Barium
Aluminium
Sodium

Answer :D
Discussion
19811.

Which amine hormone control function of sympathetic nervous system?

Answer»

thyroxine
progestron
adrenaline
insulin

Answer :C
Discussion
19812.

What will be the oxidation number of Mn in the compound of Mn formed upon fusion of MnO_2 with KOH and KNO_3 ?

Answer»

Solution :`Mnoverset(+4)O_(2)+KOH +KNO_(3) to K_(2)overset(+6)MnO_(4) +KNO_(2) +H_(2)O`
Discussion
19813.

What is the major product obtained when 2,3-dimethyl pentan-3-ol is heated in the presence of H_2SO_4.

Answer»

SOLUTION :
Discussion
19814.

Which of the following is known as freon which is used as a refrigerant ? .

Answer»

`CF_2Cl_2`
`CF_4`
`CFCl_3`
`CF_3Cl`

ANSWER :A
Discussion
19815.

Which of the following is the IUPAC name of [Co(NH_(3))_(6)]Cl_(3) ?

Answer»

Hexamminecobalt (III) chloride
Hexammine cobalt (II) chloride
Hexamminechloro COBALTATE (III)
Trichlorohexammine cobalt (III)

ANSWER :A::B::C::D
Discussion
19816.

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 a ZWITTER ion. The lone pair of electrons on the `-NH_(2)` group is DONATED towards the benzene ring DUE to resonance effect. As a result, ACIDIC character of -COOH group and basic character of `-NH_(2)` group decrease. therefore the weakly acidic -COOH group cannot transfer a `H^(+)` ion to be weakly basic `-NH_(2)` group. thus o-or p-aminobenzoic acids do not exist as Zwitter ion.
Discussion
19817.

Write the IUPAC name of the following compound : {:(CH_(2)OH),(|),(CHOH),(|),(CH_(2)OH):}

Answer»

SOLUTION :Propane-1, 2, 3- TRIOL.
Discussion
19818.

What are the products of auto - photolysis of water ?

Answer»

`H_(2)andO_(2)`
STEAM
`H_(3)O^(+)andOH^(-)`
Hydrogen peroxide

Solution :Auto photolysis of water involves breakage of chemical BONDS as the result of transfer of light energy to these bonds of water. It involves RELEASE of oxygen as a byproduct and also releases hydrogen.
`2H_(2)O to 4H^(+)+4e^(-)+O_(2)`.
Discussion
19819.

Why are ethers very little reactive chemically ?

Answer»

SOLUTION :Due to very LITTLE POLARITY of C-O-C bond in ETHERS.
Discussion
19820.

What is called the mixture containing 95% O_2 and 5%CO_2 ?

Answer»

SOLUTION :CARBOGEN
Discussion
19821.

The two strands of DNA are not identical but arecomplementary. Explain this statement.

Answer»

Solution :The TWO STRANDS of the DNA molecules are said to be complementary to each otherin the sense thatthe sequenceof bases in onestrandoutomatically controls THATOF the other. This specific BASE pairingis the most IMPORTANT principle of the structure of DNA.
Discussion
19822.

Which of the following complexes will have four isomers ?

Answer»

`[Co(en)_(3)]CI_(3)`
`[Co(en)_(2)CI_(2)]CI`
`[Co(PPh_(3))_(2)(NH_(3))CI_(2)]CI`
`[Co(PPh_(3))_(3)CI]CI_(2)`

Solution :Complex (1) exhibits optical isomerism and thus exits in TWO enantomeris form. Complex exhibits geometrical as well as optical isomerism. The cis - form is OPTICALLY ACTIVE. Thus, there are THREE isome: `(+)` - cis, `(-)` - cis andtrans - form. Complex (3) being squar planar exhibits only geomertrical isomerism. Thus, it exists in two forms: cis- and trans. Complex (4) exhibits no isomerism. Thus, the maximum no. of isomers are of complex (2).
Discussion
19823.

Which complex is diamagnetic:

Answer»

`FE(CN)_6^(4-)`
`Cu(NH_3)_4^(2+)`
`Ti(H_2O)_6^(3+)`
None

Answer :A
Discussion
19824.

Which among the following reaction will give a secondary amine?

Answer»

`CH_3CONH_2 OVERSET(Br_2"/"KOH)(to)`
`CH_3CONH_2overset(LiAlH_4)(to)`
`CH_3CN UNDERSET(NA"/"C_2H_5OH)(to)`
`CH_3NC overset(LiAlH_4)(to)`

ANSWER :D
Discussion
19825.

Which of the following process is not responsible for the presence of electric charge on the sol particles ?

Answer»

Electron capture by sol particles 
Adsorption of ionic SPECIES from solution 
Formation of Helmholtz electrical double layer 
ABSORPTION of ionic species from solution 

Solution :ELECTRIC charge on the sol particles is because of PREFERENTIAL adsorption.
Discussion
19826.

Which is not a spontaneous process:

Answer»

Expansion of a GAS into vacum
Water FLOWING down hill
Heat flowing from COLDER body to a hotter body
Evaporation of water from CLOTHES during drying

Answer :C
Discussion
19827.

Which of the followingstatement(s) is (are) correct ?

Answer»

The electron affinity for sulphur is more exothermic than that for oxygen
successive ionization energies of an ATOM always increase
First ionization energy of As is greater than that of Se
Chlorine has larger atomic SIZE as well as electron affinity than that of fluorine

Solution :(A)Oxygen atom is smaller as compared to sulphur, so in oxygen there is more inter-electronic repulsion than that of sulphur.
(B)CHARGE increases so size decreaseand number of electrons per proton also decreases, so valence shell electron gradually BECOMES more tightly held by the nucleus.
(C )valence shell electron configuration of As is `ns^2 np^2` (half filled stable configuration) and valence shell electron configuration of Se is `ns^2 np^4` (partially filled less stable configuration)
As=0.947 Mj/mole, Se=0.941 Mj/mole.
(D)Down the group atomic size increases. Fluorine experiences more inter electronic repulsion than that of chlorine, so fluorine has less electron affinity than that of chlorin.
Discussion
19828.

Write structures of the products of the following reactions : CH_3 -CH_2 - undersetoverset(|)(CH_3)(C)H - CHO overset(NaBH_4)(to)

Answer»

SOLUTION :`UNDERSET("2-methyl pentane-1-ol")(CH_3-CH_2 - CH_2 - undersetoverset(|)(CH_3)(C)H - CH_2 - OH)`
Discussion
19829.

When O_(2) is converted to O_(2)^(+)

Answer»

1. both paramagnetic character and bond order INCREASE
2. bond order decreases
3. paramagnetic character INCREASES
4. paramagnetic character decreases and the bond order increases

Solution :Bond order `O_(2)=2, O_(2)^(+)=2.5`
No. of unpaired ELECTRONS, `O_(2)=2, O_(2)^(+)=1`.
Discussion
19830.

The standard reduction potentials of Cu^(2+)//Cu and Cu^(2+)// Cu^(+) are 0.337 V and 0.153 V respectively. The standard electrode potential of Cu^(+)//Cuhalf cell is:

Answer»

`0.184` V
`0.827` V
`0.521` V
`0.490` V

Answer :C
Discussion
19831.

Which order of reaction obeys the relation t_(1//2)=1//ka:

Answer»

First
Second
Third
Zero

Answer :B
Discussion
19832.

This section contains STATEMENT-1 (Assertion) and STATEMENT-2 (Reason). Each question has 4 choices (A), (B), (C) and (D) out of which ONLY ONE is correct.QSTATEMENT-1: In water, orthoboric acid behaves as a weak monobasic acid. and STATEMENT-2: in water, orthoboric acid acts as a proton donor.

Answer»

Statement-1 is True, Statement-2 is True, Statement-2 is a CORRECT explanation for Statement-1.
 Statement-1 is True, Statement-2 is True, Statement-2 is NOT a correct explanation for Statement-1.
Statement is True Statement 2 is False
 Statement-his False, Statement 2-is-Free

Solution :`H_(3)BO_(3)` (orthoboric acid) is a weak lewis acid.
`H_(3)BO_(3)+H_(2)Oleftrightarrow(OH)_(4)+H`
It does not donate proton rather it acceptors oH FORM water
Discussion
19833.

This section contains STATEMENT-1 (Assertion) and STATEMENT-2 (Reason). Each question has 4 choices (A), (B), (C) and (D) out of which ONLY ONE is correct.QSTATEMENT-1: Band gap in germanium is small. and STATEMENT-2: The energy spread of each germanium atomic energy level is infinitesimally small.

Answer»

Statement-1 is True, Statement-2 is True, Statement-2 is a correct EXPLANATION for Statement-1
Statement-1 is True, Statement-2 is True, Statement-2 is NOT a correctexplanation for Statement-1
Statement-1 is True, Statement-2 is FALSE
 Statement-1 is False, Statement-2 is True

Answer :C
Discussion
19834.

This section contains STATEMENT-1 (Assertion) and STATEMENT-2 (Reason). Each question has 4 choices (A), (B), (C) and (D) out of which ONLY ONE is correct.QSTATEMENT-1: Boron always forms covalent bond. and . STATEMENT-2: The small size of BO favours formation of covalent bond.

Answer»

 Statement-1 is TRUE, Statement-2 is True, Statement-2 is a correct EXPLANATION for Statement-1
 Statement-1 is True, Statement-2 is True, Statement-2 is NOT a correct explanation for Statement-1.
Statement-1 is True, Statement-2 is True. .
Statement-1 is False, Statement-2 is True.

Solution :According to Fajan.s rule small cations having high charge DENSITY always have tendency to form COVALENT bond.
Discussion
19835.

Which of the following lanthanoid ions is diamagnetic?

Answer»

`Eu^(2+)`
`YB^(2+)`
`YCE^(2+)`
`Sm^(2+)`

SOLUTION :`Yb^(2+) - 4F^(14)` -no unpaired electrons-diamagnetic
Discussion
19836.

This law was proposed by Dalton in 1803 . According to this law , if two elements combune to form more than one compounds ,the masses of one element that combine with a fixed mass of the other element, are in the ratio of small whole number. For exemple, hydrogen combines with oxygen to form two compounds ,namely, water and hydrogen peroxide. Here, the masses of oxygen (i.e, 16g and 32g) which combine with a fixed mass of hydrogen (2g) bear a simple raio, i.e, 16 :32 or 1 :2 0.11 g of an oxide of nitrogen gives 56 Ml N_(2) at 273K and 1 atm. 0.15 g of another oxide of nitrogen gives 56mL N_(2) at 1 atm , 273K. Show that these data confirm the law of multiple proportion.

Answer»


Answer :`0.11` GM OXIDE gives `=> 0.07` gm N, HENCE; `0.07` gm N + `0.04` gm O
`0.15` gm oxide gives `=>0.07` gm N, Hence; `0.07` gm N + `0.08` gm O
Discussion
19837.

Which colourless gas evolves when NH_4Cl reacts with Zinc in a dry cell battery?

Answer»

`NH_3`
`N_2`
`H_2`
`Cl_2`

SOLUTION :`2NH_4Cl + ZN to 2NH_3 + ZnCl_2 + H_2 UARR`
Discussion
19838.

Which of the following gas is used in warfare

Answer»

`N_(2)O`
`C Cl_(3).NO_(2)`
`CO_(2)`
`O_(2)`

SOLUTION :`C Cl_(3)NO_(2)` or CHLOROPICRIN is used as a war GAS.
Discussion
19839.

Which alcohol is most reactive for dehydrogenation ?

Answer»

`CH_3-OVERSET(OH)overset(|)(CH)-CH_2-NO_2`
`CH_3-overset(OH)overset(|)(CH)-CH_2-CHO`
`CH_3-overset(OH)overset(|)(CH)-CH_2-CN`
`CH_3-overset(OH)overset(|)(CH)-CH_2-COCH_3`

ANSWER :A
Discussion
19840.

The thermal dissociation equlibrium of CaCO_(3)(s) is studied under different conditions CaCO_(3)(s)hArrCaO(s)+CO_(2)(g) For this equlibrium, the correct statement (s) is (are)

Answer»

`Deltah` is dependent on T
K is independent of the initial amount of `CaCO_(3)`
K is dependent on the pressure of `CO_(20` at a givn T
`DeltaH` is independent of the catalyst, if any

Solution :(a) `DeltaH_(2)-DeltaH_(1)=C_(p(rxn))(T_(2)-T_(1))andC_(p)` depends on temperatue. Hence enthlpy also depends on temperature.
(b) `CaCO_(3(s))CaO_((s))+CO_(2(g))K_(P)=(P_(CO_(2)))_("at equlibrium m")` for a GIVEN reaction, `K_(eq.)` depends only on temperature.
(C)`K_(eq.)` depends only on temperature.
(d) Enthalpy of reaction is independent of the catalyst. Catalyst generally CHANGES activation ENERGY.
Discussion
19841.

The reagent commonlyused to determine hardness of water titrimetrically is

Answer»

1. oxalic acid
2. disodium salt ofedta
3. sodium citrate
4. sodium thiosulphate

ANSWER :B
Discussion
19842.

Two possible stero structures of CH_(3)-CHOH-COOH, Which are optically active are called:

Answer»

diasteromers
atropisomers
enantiomers
MESOMERS.

ANSWER :C
Discussion
19843.

Which of the following undergoes nucleophilic substitution exclusively by S_(N)1 mechanism?

Answer»

BENZYL CHLORIDE
Ethyl chloride
Chloro benzene
Isopropyl chloride

SOLUTION :Benzyl chloride undergoes exclusively `S_(N)1` MECHANISM because it FORMS resonance stabilized benzyl carbocation.
Discussion
19844.

What will happen to equilibrium : Ice hArr WaterIf pressure is applied :

Answer»

More ice will be FORMED
Water will EVAPORATE
More water will be formed
Equilibrium will be formed.

Answer :C
Discussion
19845.

Which of the following statements is not valid for oxoacids of phosphorus?

Answer»

Orthophosphoric acid is used in the manufacture of triple superphosphate.
Hypophosphorous acid is a diprotic acid.
All oxoacids contain TETRAHEDRAL four coordinated phosphoms.
All oxoacids contain atleast oneP= 0 an done P-OH group

Solution :
Hypophosphorous acid `(H_(3)PO_(2))` is a monobasic acid i.e., it has only one ionisable hydrogen ATOM or one OH is PRESENT.
Discussion
19846.

Which of the following has largest number of isomers ?

Answer»

`[RU(NH_(3))_(4)Cl_(2)]^(+)`
`[CO(en)_(2)Cl_(2)]^(+)`
`[Ir(PR_(3))_(2)H(CO)]^(2+)`
`[Co(NH_(3))_(5)Cl]^(2+)`

Solution :All GIVEN compounds have CIS and trans isomers but only cis-isomer of (B) will also have optical isomers (d and l) due to presence of symmetrical didentate, en.
Discussion
19847.

Total number of atoms per unit cell in a face-centred cubic unit cell is

Answer»

4
3
2
1

Answer :a
Discussion
19848.

What are the consequences of using non-biodegradable detergents ?

Answer»

SOLUTION :Non-biodegradable detergents are degraded only slowly by microorganisms. Therefore, they ACCUMULATE in rivers and other WATERWAYS causing severe WATER pollution.
Discussion
19849.

Which of the following strategy is not a correct approach reduce global warming

Answer»

Reducing the greenhouse gas emission by limiting the USE of fossil fuels
Increase the VEGETATION cover particularly the forest photosynthetic UTILIZATION of `CO_2`
Minimizing the use of nitrogen FERTILIZERS in agriculture for reducing `N_2O` emission
Increasing the use of AIR conditioners, refrigeration and production of plastic foams and propellants in aerosol spray cans

Answer :D
Discussion
19850.

Which metal has the least melting point

Answer»

Cr
TI
Cu
Zn

Answer :D
Discussion