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14151.

Which of the following does not react with phenyl hydrazine ?

Answer»

ETHANOL
Ethanal
ACETONE
2- PENTANONE

Answer :A
Discussion
14152.

Which of the following is malachite ore ?

Answer»

`Cu_2S`
`Cu_2O`
`CuCO_3`
`CuCO_3` . CU `(OH)_2`

ANSWER :D
Discussion
14153.

Which compound in each of the following paris will react faster in SN^(2) reaction with HO^(o-) ? a. CH_(3)Br or CH_(3)I b. (CH_(3))_(3)CCl or CH_(3)Cl c. CH_(2) = CHBr or CH_(2) = CH - CH_(2)Br

Answer»




SOLUTION :(a)` products would be:
DUE to stablisation of carbonim ION
b. Same explanation as in `(a)`, the product would be mixture of `(I)` and`(II)`

So, statements `(c)` and `(d)` are correct.
Discussion
14154.

Which one is not a constituent of nucleic acid?

Answer»

Uracil
GUANIDINE
PHOSPHORIC ACID
Ribose sugar

Solution : Guanidine is not a CONSTITUENT of NUCLEIC acid.
Discussion
14155.

Which of the following is not a characteristic of a crystalline solid? i) Definite heat of fusion ii) Isotropic nature iii) A regular ordered arrangement of constituent particles. iV) A true solid

Answer»


ANSWER :ISOTROPIC NATURE
Discussion
14156.

What is homogeneous catalysis? Give example.

Answer»

Solution :HOMOGENEOUS catalysis is a process in which the reaction, PRODUCTS and catalyst are present in the same phase.
e.g.` 2SO_(2(g)) + O_(2(g)) + overset(NO_((g))) to 2SO_(3(g))`
N the above reaction, the catalyst NO, the reactants SO2, O, and product So, are present in the gaseous form
Discussion
14157.

Which of the following solution having same vapour pressure as 0.3 M glucose solution ?

Answer»

`0.1 M [Co(H_(2)O)_(3)(NO_(2))_(3)]`
`0.1 M Na_(2)[Co(H_(2)O)(NO_(2))_(5)]`
`0.1 M Na [Co(H_(2)O)_(2)(NO_(2))_(4)]`
`0.1 M Na_(3)[Co(NO_(2))_(6)]`

Solution :`Na_(2)[Co(H_(2)O)(NO_(2))_(5)]to 2Na^(+)+[Co(H_(2)O)(NO_(2))_(5)]`
TOTAL no. of ions are 3.
So `= 3xx0.1=0.3 M`
Discussion
14158.

Which of the following is incorrect regarding catalysis?

Answer»

Change in catalyst of reaction MAY change the reaction product.
Catalyst CHANGES the PATHWAY of reaction.
In case of negative catalysis, each step of MECHANISM occur at higher threshould energy than uncatalysed reaction.
Enzyme catalysis is HOMOGENEOUS catalysis.

Answer :C
Discussion
14159.

Write the formula of the following coordination compound Iron(III) hexacyanoferrate(II)

Answer»

SOLUTION :`FE[Fe(CN)_6]_3`
Discussion
14160.

What is rancidity of oils and fats ? How it can be prevented ?

Answer»

Solution :Bad/Unpleasant smell developed when oil or FAT is exposed to warm MOIST air.
Addition of vitamin C and E
OR Refrigeration
OR
Adding antioxidants
OR
Store in COOL DRY place.
Discussion
14161.

What is the osmotic pressure of the solution obtained by mixing 300cm^(3) of 2% (mass - volume) solution of urea with 300cm^(3) of 3.42% solution of sucrose at 20^(@)C ?(R=0.082 "L atm K"^(-1)mol^(-1))

Answer»

5 atm
5.2 atm
2.6 atm
4.5 atm

Solution :`PI = pi_(1)+pi_(2)`
Discussion
14162.

The standard reduction potential for Fe^(2+) | Fe and Sn^(2+) |Sn electrodes are -0.44V and -0.14V respectively. For the cell reaction, Fe^(2+)+Sn rarr Fe +Sn^(2+), the standard emf is :

Answer»

`+0.30V`
`0.58V`
`+0.58 V`
`-0.30V`

ANSWER :D
Discussion
14163.

Which of the following two reactions is S_(N^(2)) and why?

Answer»

Solution :Reaction(1) follows `S_(N^(2))` mechanism SINCE there is an inversion of CONFIGURATION as RESULT of the reaction. However, there is no inversion is reaction (ii).
Discussion
14164.

The species in which the N atom is in a state of sp hybridization is :

Answer»

`NO_(2)`
`NO_(2)^(+)`
`NO_(2)^(-)`
`NO_(3)^(-)`

Solution :`NO_(2) to sp^(2)` HYBRIDIZATION
`NO_(2)^(+) to sp` HYBRIDISATION
`NO_(2)^(-) to sp^(2)` Hybridisation
`NO_(3)^(-) to sp` Hybridisation.
Discussion
14165.

Which of the following is not correct regarding the interhalogen compound bromine pentafluoride

Answer»

It is formed in fifth excited STATE of BROMINE
Oxidation number of bromine is + 5
HYBRIDISATION of bromine is `sp^3d^2`
It has square monopyramidal structure

Answer :A
Discussion
14166.

Which of the following is not a metal ?

Answer»

GOLD
Mercury
Scandium
Selenium

Answer :D
Discussion
14167.

The shape of BF_3 species is

Answer»

Tetrahedral
Square planar
Trigonal planar
Linear

Answer :A
Discussion
14168.

What is the correct order of hydration enthalpies of M^(2+) ions of first series?

Answer»

`Cr^(2+) gt Mn^(2+) gt Co^(2+) gt NI^(2+)`
`Ni^(2+) gt Co^(2+) gt Mn^(2+) gt Cr^(2+)`
`Ni^(2+) gt Co^(2+) gt Cr^(2+) gt Mn^(2+)`
`Cr^(2+) gt Mn^(2+) gt Ni^(2+) gt Co^(2+)`

Solution :HYDRATION enthalpy depends on CHARGE to radius RATIO
Discussion
14169.

Whichof the followingmacromoleculedoes not have a repeatingstructure unit ?

Answer»

POLYTHENE
NYLON
CHLOROPHYLL
Terylene

Answer :C
Discussion
14170.

Which important greenhouse gas, other than methane, is being produced from the agricultural fields

Answer»

Ammonia
Sulphur dioxide
Arsine
Nitrous oxide

Solution : In addition to `CO_2` some other GASES also CONTRIBUTE 10 green house EFFECT These include OZONE, CFCs, nitrous oxides and even methane Nitrous oxide is produced by denitrifying bacteria acting on artificial fertilizers applied to poorly aerated soils
Discussion
14171.

When KMnO_(4) solution is titrated with a solution containing Fe^(2+) ion, the indicator used in this titration is

Answer»

Phenolphthalein
Methyl orange
`K_(3)[Fe(CN)_(6)]`
None of these

Solution :Here `KMnO_(4)` is USED as an indicator as WELL as a REACTANT.
Discussion
14172.

Which of the following produces only one product on reduction with LiAIH_4

Answer»

`CH_3COOC_2H_5`
`C_2H_5COOC_2H_5`
`C_2H_5COOCH_3`
`CH_3COOCH_2-CH_2-CH_3`

ANSWER :A
Discussion
14173.

What happens when ethanol is heated with phosphorus tribromide ?

Answer»

Solution :`3CH_(3)CH_(2)OH+ PBr_(3) OVERSET(Delta)to 3CH_(3)CH_(2)Br+ H_(3)PO_(3)`
Discussion
14174.

Which compound undergoes iodoform reaction ?

Answer»

HCHO
`CH_3CHO`
`CH_3OH`
`CH_3COOH`

ANSWER :B
Discussion
14175.

Name the reagent used to convert toluene to benzaldehyde.

Answer»


ANSWER :CHROMYL CHLORIDE
Discussion
14176.

What is COD ? Write chemical substance is generally used in measurement ?

Answer»

SOLUTION :COD stands for chemical oxygen demand. It is measured by TREATING the given SAMPLE with an OXIDIZING agent.
Discussion
14177.

Which of the following brings about dry bleaching

Answer»

ozone
chlorine
sulphur DIOXIDE
HYDROGEN peroxide

SOLUTION :`O_3` acts as DRY bleach
Discussion
14178.

What knowledge about the carbon -carbon bond length in benzene may be obtained from valence bond theory ?

Answer»

Solution :The benzene moleculeis a resonance hybrid of Kekule structures (I) and (II) and contribution of each hybridstructure is 50% i.e., EQUAL.

The single bonds (C-C) and the double bonds (C=C) in structure (I) become double and single bonds respectively in structure (II) . As the two equally stable resonance structures (I) and (II) contribute equally to the hybrid, it may be said that, any two ADJACENT carbon atoms of benzene molecule are linked by a bond INTERMEDIATE between a single and a double bond . so, all the carbon -carbon bonds of benzene are EQUIVALENT and their lengths are equal(1.39 Å) .
Again , bond order of each bond isthe same (1.5) . so, it can be said that all carbon -carbon bonds are equal in LENGTH .
Bond order = `("Doublebond +Single bond ")/2=(2+1)/2=1.5`
Discussion
14179.

Which of the following options correctly match the graph of Z us P at normal temperature with gases ?

Answer»

`I-H_(2),II-He, III-CO_(2),IV -NH_(3)`
`I-He,II-H_(2),III-NH_(3),IV-CO_(2)`
`I-H_(2),II-He,III-NH_(3),IV-CO_(2)`
`I-He,II-H_(2),II-CO_(2),IV-NH_(3)`

ANSWER :A
Discussion
14180.

Yellow ammonium sulphide is

Answer»

`(NH_(4))_(2)S_(8)`
`(NH_(4))_(2)S`
`(NH_(4))_(2)S_(x)`
`(NH_(4))_(2)S_(4)`

Solution :YELLOW ammonium sulphide is `(NH_(4))_(2)S_(x)`
Discussion
14181.

What is 'Disproportionation' of an oxidation state Give one sample of disproportionation reactions in an aqueous solution.

Answer»

Solution :In a disproportionation REACTION, same substance undergoes oxidation (INCREASE in oxidation number)as well as reduction (decrease in oxidation number) RESULTING in the formation of two different products.
In other words, same substance is behaving as oxidizing agent for one MOLECULE and at the same time as reducing agent for another molecule.
E.g.(i) `3MnO_(4)^(2-)+4H^(+) to underset ((+7)) (2MnO_(4)^(2-)) +underset((+4)) (MnO_(2)) +2H_(2)O`
Oxidation state of `MnO_(4)^(2-)=(6)`
(ii) `3CrO_(4)^(3-)+8H^(+) to underset((6))(2CrO_(4)^(2-))+underset((3))(Cr_(2)^(3+))+4H_(2)O`
Discussion
14182.

What volume of O_(2) is soluble in 100cm^(3) of water at 293 K.

Answer»

`3.08c C`
`30.8cm^(3)`
`1.02cm^(3)`
`4.2cm^(3)`

ANSWER :A
Discussion
14183.

What happen when PCl_(3) is treated with cold water?

Answer»

Solution :When `PCl_(3)` is hydrolysed with COLD water it gives phosphorous ACID.
`PCl_(3)+underset("(Cold)")(3H_(2)O)rarr underset("(Phosphorous acid)")(H_(3)PO_(3)+3HCl)`
Discussion
14184.

Zinc obtained by reduction process from zinc oxide is known by which name?

Answer»

RETORT 
Speltor 
BLISTER COPPER 
Constantan 

ANSWER :B
Discussion
14185.

What type of colloid is formed when a liquid is dispersed in a solid ? Give an example.

Answer»

SOLUTION :GEL, e.g., MUDDY WATER.
Discussion
14186.

When no more solute can be dissolved at the same temperature and pressure, the solution obtained is called.

Answer»

SOLUTION :SATURATED
Discussion
14187.

Which one is a Lewis acid

Answer»

`CIF_(3)`
`H_(2)O`
`NH_(3)`
NONE of these

Solution :Because they have VACANT d-orbital in CENTRAL atom.
Discussion
14188.

Which among the following is a semi synthetic polymer.

Answer»

Cellulose RAYON
Acrylonitrile
Cellulose NITRATE
Both 1 & 3

Answer :D
Discussion
14189.

When acetylene is passed into dilute sulphuric acid containing Hg^"2+" ions, the product formed is

Answer»

Acetone
Acetic acid
Acetaldehyde
Formaldehyde

Solution :`CH-=CHunderset(1%HgSO_4)overset(40%H_2SO_4)to UNDERSET"VINYL alcohol"(CH_2=CH-OH)overset"rearrangement"to underset"Acetaldehyde"(CH_3-CHO)`
Discussion
14190.

When calomel reacts with NH_(4)OH, we get

Answer»

`HgNH_(2)CL`
`NH_(2)-Hg-Hg-Cl`
`Hg_(2)O`
`HgO`

Solution :`underset("Calomel")(Hg_(2)Cl_(2))+2NH_(4)OHrarrNH_(4)Cl+2H_(2)O+Hg+HgNH_(2)Cl`
Discussion
14191.

Which of the following statements about starch are incorrect?

Answer»

It is a disaccharide
It OCCURS in the walls of plants.
It gives a dark blue colour with l, solution.
It gives a red precipitate on BOILING with FEHLING's solution

Solution :STARCH is a polysaccharide,it does not occur in cell wall of PLANTSAND it does not reduce Fehling .s solution .
Discussion
14192.

The standard reduction potential values of three metallic cations X, Y and Z are 0.52, -3.03 and -1.18V respectively. The order of reducing power of the corresponding metals is :

Answer»

`Y GT Z gt X`
`X gt Y gt Z`
`Z gt Y gt X`
`Z gt X gt Y`

ANSWER :A
Discussion
14193.

Which one of the following is the correct decreasing order or boiling point ?

Answer»

`H_(2)Te GT H_(2)O gt H_(2)Se gt H_(2)S`
`H_(2)O gt H_(2)S gt H_(2)Se gt H_(2)Te`
`H_(2)Te gt H_(2)Se gt H_(2)S gt H_(2)O`
`H_(2)O gt H_(2)Te gt H_(2)Se gt H_(2)S`

Solution :Among the hydrides of group 16 elements, boiling point of `H_(2)O` is higher than `H_(2)S` (difference in boiling points of `H_(2)O and H_(2)S` is around `200^(@)C`) because of strong inter molecular hydrogen bonding. After the decrease in boiling point from `H_(2)O` to `H_(2)S`, from `H_(2)S " to " H_(2)Te`, it INCREASES due to increase in size of the atoms from S to Te which increases the magnitude of van der WAAL's forces among the molecules. So, the CORRECT ORDER of boiling points is
`H_(2)O gt H_(2)Te gt H_(2)Se gt H_(2)S`
Discussion
14194.

Which one of the following statements is incorrect for the sucrose?

Answer»

It is obtained from cane sugar.
It is not reducing sugar.
On HYDROLYSIS, it gives equal quantities of D-GLUCOSE and D-fructose.
It gives aspartame when it Is heated at `210^@ C` .

Solution :Sucrose obtained from cane sugar. On hydrolysis of sucrose it gives equimolar MIXTURE of D (+)-glucose and D (-)-fructose. Sucrose is a non-reducing sugar.
Sucrose `underset"or invertase"overset(H^+)to ` D(+)-glucose + D(-) - fructose
Discussion
14195.

When a gas undergoes adiabatic expansion, it gets cooled due to

Answer»

LOSS of kinetic energy
FALL in TEMPERATURE
Decrease in velocity
Energy USED in doing work

Solution :Due to fall in temperature.
Discussion
14196.

Which of the following are not state functions (I)q+w(II) q(III) w(IV) H-TS

Answer»

(I), (II) and (III)
(II) and (III)
(I) and (IV)
(II), (III) and (IV)

ANSWER :B
Discussion
14197.

Which of the following atom with outer electronic configuration exhibit maximum oxidation state ?

Answer»

`3s^(1)`
`3D^(1) 4S^(2)`
`3d^(2) 4s^(2)`
`4s^(2) 3d^(2)`

SOLUTION :`4s^(2)3d^(3)=2+3=5` oxidation states
Discussion
14198.

What is the value of Faraday constant? Define it.

Answer»

Solution :IF = 96500 C
It is defined as the quantity of ELECTRICITY which deposits one GRAM EQUIVALENT of the substance or it is the charge carried by one mole of ELECTRONS.
Discussion
14199.

The reagent needed for converting Ph - C -= C - Ph to (##DSH_NTA_JEE_MN_CHE_C13_E01_014_Q01.png" width="80%"> is :

Answer»

Cat . Hydrogenation
`H_(2)`/Lindlar Cat .
Li/`NH_(3)`
`LiAlH_(4)`

Solution :With Lithium in liquidammonia , trans - alkeneis almostan exclusiveproduct .
`Ph - C -= C - Ph overset ("Li in liq" .NH_(3)) underset ("Birch REDUCTION") to(##DSH_NTA_JEE_MN_CHE_C13_E01_014_S01.png" WIDTH="80%">
Discussion
14200.

Which of the followingare step growth as well as condensation polymer

Answer»

Nylon-66
Bakelite
Nylon-66
Buna-S

Solution :Nylon-66, Bakelite, Nylon-6 are step growth CONDENSATION polymers.
(d) Buna-S is addition copolymer of BUTADIENE and styrene, therefore it is not step growth polymer.
(a) Nylon-66 is polymer of adipic acid and HEXAMETHYLENEDIAMINE
(b) Bakelite is polymer of PHENOL and HCHO
(C) Nylon-6 is polymer of caprolactum
Discussion