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12201.

Which of the following is not the correct condition for resonance ?

Answer»

the positions of all the atomic nuclei in the RESONATING structures are not the same.
the resonating structures must have the same number of UNPAIRED or paired electrons.
the MOLECULES EXHIBITING resonance must be planar in nature.
the resonating structures must have nearly the same energies.

ANSWER :C
Discussion
12202.

Which of the following lanthanoid has smallest atomic radius?

Answer»

Gadollinium
Scandium
Lutesium
Cerium

Answer :C
Discussion
12203.

Which statement is correct with ethanal and propanone (1) Both react with NaHSO_(3) (2)Both gives iodoform test (3) Bothcan be reduced into alcohols (4) Both undergoes aldol condensation

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`1,3`
`2,3`
`2,4`
all of these

ANSWER :D
Discussion
12204.

Write IUPAC names of the following (i) [CoCl_(2)(en)_(2)]SO_(4) (ii) [Ni(CO)_(4)] (iii) K[PtCl_(3)(NH_(3))](iv) [Cr(en)_(3)]Cl_(3)

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SOLUTION :(i) dichlorido bis (ethane-1,2-diamine) cobalt (IV) sulphate (ii) tetracarbonyl nickel (0)
(iii) potassium amminetrichloroplatinate (II) (iv) TRIS (ethane-1, 2-diamine) CHROMIUM (III) CHLORIDE
Discussion
12205.

Which of the following mechanisms deos the reaction proceed?

Answer»

`SN^(1)`
`SN^(2)`
`SN^(i)`
`E2`

SOLUTION :NA
Discussion
12206.

Which of the following hormones contains iodine

Answer»

Insulin
Testosterone
Adrenaline
Thyroxine

ANSWER :D
Discussion
12207.

Which pair would not be expected to formprecipitate whensolutionare mixed?

Answer»

`K^(o+),SO_(4)^(2-)`
`Na^(o+),S^(2-)`
`Ag^(o+),NO_(3)^(Θ)`
`Al^(3+),HO^(Θ)`

SOLUTION :`AI(OH)_(3)` is insoluble in `H_(2)`
Discussion
12208.

Which chemical is responsible for nasal congestion associated with common cold and allergic response to pollen ?

Answer»

SOLUTION :HISTAMINE
Discussion
12209.

Which amino acid has the amidine group ?

Answer»

LYSINE
ARGININE
ASPARAGINE
Lysine

Solution :Arginine
Discussion
12210.

Write the IUPAC name of

Answer»

SOLUTION :N, N DIMETHYLANILINE.
Discussion
12211.

When MnO_(2) is fused with KOH, a coloured compound is the product and the colour is :-

Answer»

`Mn_(2)O_(4)`, black
`KMnO_(4)`, purple
`Mn_(2)O_(3)`, BROWN
`K_(2)MnO_(4)` GREEN

ANSWER :D
Discussion
12212.

Which of the following is 2,3-dimethyl -1-nitropentane

Answer»




ANSWER :D
Discussion
12213.

Which one among the following is a double salt ?

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`K_(4)[Fe(CN)_(6)]`
`K_(2)SO_(4)* Al_(2)(SO_(4))_(3)* 2H_(2)O`
`CuSO_(4)* 5H_(2)O`
NaCl

Solution :Double salts are salts CONTAINING more than one cation or anion , OBTAINED by combination of two different salts which were CRYSTALLIZED in the same regular ionic lattice.
Discussion
12214.

What is the role of activated charcoal in gas mask?

Answer»

SOLUTION :ADSORPTION of TOXIC GASES
Discussion
12215.

What is the percent by mass of titanium in rutile, a mineral that contain Titanium and oxygen, if structure can be described as a closet packed array of oxide ions, with titanium in one half of the octahedral holes. What is the oxidation number of titanium ?

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ANSWER :59.95%+4
Discussion
12216.

The value of entropy of solar system is

Answer»

increasing
decreasing
constant
zero

Solution :All naturally occurring PROCESSES are SPONTANEOUS and are ACCOMPANIED by a net INCREASE in ENTROPY.
Discussion
12217.

Which one of the following is formed when acetylene is hydrolysed in the presence of HgSO_4 and H_2SO_4 ?

Answer»

ETHANAL
ETHYLENE
Ethane
ETHANOL

SOLUTION :Ethanol
Discussion
12218.

What mass of NaCl must be dissolved in 65.0 g of water for lowering the freezing point of water by 7.50^(@)C ? The freezing point depression constant (K_(f)) for water is 1.86^(@) C/m. Assume Van't Hoff factor for NaCL is 1.87 (molar mass of NaCl = 58.5 g )

Answer»

SOLUTION :`W_(B)= ?, M_(B) = 58.5 , W_(A) = 65 ` g
`DELTA T_(f) = 7.5`
`K_(f) = 1.86`

i=1.87
`Delta T_(f) = iK_(f)` m
7.5 = 1.87 `xx 1.86 xx (W_(B))/(58.5) xx (1000)/(65)`
28518.7= 3478.2 `W_(B)`
`W_(B) = ` 8.19
Discussion
12219.

Two consecutive irreversible fierst order reactions can be represented by Aoverset(k_(1))(rarr)Boverset(k_(2))(rarr)C The rate equation for A is readily interated to obtain [A]_(t)=[A]_(0).e^(-k_(1^(t))) , and [B]_(t)=(k_(1)[A]_(0))/(k_(2)-k_(1))[e^(-k_(1)^(t))-e^(-k_(2)^(t))] If k_(1) and k_(2) both are almost same then which graph is most suitable ?

Answer»

GRAPH A
graph B
graph C
graph D

Answer :A
Discussion
12220.

The total number of organic products formed at the end of the reaction sequence is / are C_(6)H_(5)-CO-CH_(3)overset(NH_(2)OH)to overset(P_(2)O_(5))to overset(H_(2)O//OH^(-))to

Answer»


SOLUTION :
Discussion
12221.

which of the following is branched polymer ?

Answer»

PVC
Nylon
POLYPROPENE
MELAMINE

ANSWER :C
Discussion
12222.

Which of thefollowingamineattractinsect ?

Answer»

Trimethyl AMINE
Methylamine
Dimethylamine
Tetramethylammoniumchloride

Solution :TRIMETHYLAMINE ispresentin animals and plants
Discussion
12223.

Which of the following are true for first order reaction?

Answer»

`t_(3//4)=2t_(1//2)`
`t_(15//16)=4t_(1//2)`
`t_(15//16)=3t_(3//4)`
`t_(7//8)=2t_(3//4)`

ANSWER :A::B
Discussion
12224.

Which of the following is scientific explanationof depression ?

Answer»

An increased level of SUGAR in the blood leads to depression .
Low levels of noradrenaline, a neurotransmitterin the blood leads to depression .
Releaseof extra gastric JUICES in the STOMACH leads to depression.
Sleep inducing drugs LEAD to depression.

Solution :Noradrenaline is a neurotransmitter that plays a role in mood swings. Low levels of noradrenalinelower the signal-sending activity and make theperson suffers from depression.
Discussion
12225.

Write the reaction of F_(2) with water.

Answer»

SOLUTION :`F_(2)+H_(2)OrarrHF+HOF`
Discussion
12226.

Thermal stability of hydrides of group 16 elements decreases in the following order

Answer»

`H_(2)PO gt H_(2)Te gt H_(2)Se gt H_(2)S gt H_(2)O`
`H_(2)O gt H_(2)S gt H_(2)Se gt H_(2)Te gt H_(2)Po`
`H_(2)S gt H_(2)Se gt H_(2)O gt H_(2)Te gt H_(2)Po`
`H_(2)S gt H_(2)Se gt H_(2)Te gt H_(2)O gt H_(2)Po`

Solution :It is because the STRENGTH of M-H bond decreased down the group, due to the INCREASES in the SIZE of central atom 'M',
Discussion
12227.

Which of the following detergent is use in hair conditioner?

Answer»

ABS
LAS
Cetyl TRIMETHYL AMMONIUM BROMIDE.
Sodium lauryl SULPHATE. 

SOLUTION :Cetyl trimethyl ammonium bromide.
Discussion
12228.

Which of the following is not a surfactant?

Answer»

`CH_(3)-(CH_(2))_(15)-N^(+)(CH_(3))_(3)Br^(-)`
`CH_(3)-(CH_(2))_(14)-CH_(2)NH_(2)`
`CH_(3)-(CH_(2))_(16)-CH_(2)OSO_(2)^(-)NA^(+)`
`OHC-(CH_(2))_(14)-CH_(2)-COO^(-)Na^(+)`

SOLUTION :`CH_(3)-(CH_(2))_(14)-CH_(2)-NH_(2)` is not a surfactant( or detegent ).
Discussion
12229.

Which of the following reactions defines DeltaH_(f)^(@)?

Answer»

`C_("(diamond)")+O_(2)(g) rarr CO_(2)(g)`
`1//2 H_(2)(g)+1//2 F_(2)(g) rarr HF(g)`
`N_(2)(g)+3H_(2)(g) rarr 2NH_(3)`
`CO(g)+1//2O_(2)(g) rarr CO_(2)(g)`

Solution :(A) Defines correct `DeltaH_(f)^(@)` if diamond replaces by graphite.
(D) Only elementary must be PRESENT on reactant sides.
Discussion
12230.

Which element has least electronegativity in the Pauling's scale?

Answer»

SOLUTION :FLUORINE
Discussion
12231.

Which of the following molecule has zero dipole moment ? (1) H_(2)O_(2) (2)

Answer»

Only I
both II and III
I, III and IV all
I, II and III only

Solution :In II and III molecule resultant vector addition is ZERO
Discussion
12232.

Which of the following does belongs to penicillin group drugs?

Answer»

Mithicillin
opiates
steroids
catecholamine

Solution : Mithicillin
Discussion
12233.

Thermochemical reactionsC("graphite")+(1)/(2)O_(2)(g)rarrCO(g), DeltaH =- 110.5 kJ CO(g)+(1)/(2)O_(2)(g)rarrCO_(2)(g),DeltaH=-283.2 kJ From the above reaction, the heat of reaction for C(graphite) +O_(2)(g)rarrCO_(2)(g) will be

Answer»

`- 393.7` kJ
`+ 393.7` kJ
`- 172.7` kJ
` + 172.7` kJ

Solution :EQ. (i) + eq. (II) gives the required RESULT.
Discussion
12234.

Write equation for the preparation of polyvinyl chloride ?

Answer»

SOLUTION :`N CH_(2)=CHCIoverset("PEROXIDES")to`
Discussion
12235.

Which of the folliwng compounds is the most reactive towards electrophilic substitution reaction?

Answer»




SOLUTION :It is more REACTIVE TOWARDS `SE` reactiions, DUE to hyperconjugation.
Discussion
12236.

Which of the following statements about oxide of phosphorus is not correct ?

Answer»

<P>` P_4O_10` is ANHYDRIDE of `H_3PO_4`
`P_4O_6` is anhydride of ` H_3PO_3`
`P_4O_6` act as a ligand for transition element
P - P BONDS are present in `P_4O_6`

SOLUTION :P - O - P bonds are present in `P_4O_6`
Discussion
12237.

When 20 g of naphthoic acid (C_(11)H_(8)O_(2)) is dissolved in 50 g of benzene (K_(f)=1.72Kkgmol^(-1)), a freezing point depression of 2 K is observed. The van't Hoff factor

Answer»

0.5
1
2
3

Answer :A
Discussion
12238.

Which of the following is an oxidising agent ?

Answer»

`[Mn(CO)_5]`
`[FE(CO)_5]`
`[Mn_2(CO)_(10)]`
`[Fe_2(CO)_9]`

Answer :A
Discussion
12239.

What is a semiconductor ? Describe the two main types of semiconductors and contrast their conduction mechanism.

Answer»

Solution :SUBSTANCES having conductance intermediate between those of CONDUCTORS (metals) and NON- conductors (insulators) are called semiconductors.
Two main types of semiconductors are n-type and p-type.
Solids doped with electron RICH impurities are n-type semiconductors while electron deficit semiconductors are p-type semiconductors.
While n-type semiconductors work by the movement of negative CHARGE (electrons), the p-type semiconductors work by the movement of positive charge (vacancies).
Discussion
12240.

When an electric current is passed through acidified water, 112 ml of hydrogen gas at N.T.P. is collected at the cathode in 965 seconds. The current passed, in amperes is:

Answer»

`1.0` A
`0.5` A
`0.1` A
`2.0` A

Answer :A
Discussion
12241.

What current is to be passed for 0.25 sec for depostion of certain weight of metal which is equal toits electrochemical equivalent ?

Answer»


SOLUTION :`PHI = it , 1 = i XX 0.25 , 1 = 1//0.25 = 100//25 =4`
Discussion
12242.

What are main impurities in a colloidal solution?

Answer»

SOLUTION :The MAIN impurities PRESENT in a colloidal SOLUTIONS are electrolytes.
Discussion
12243.

What type of bonding is present in globular proteins?

Answer»

Solution :HYDROGEN bonding, DISULPHIDE linkage and van der WAALS. forces.
Discussion
12244.

The reagent used in the conversion of - undersetoverset(||)(O)(C ) -group into – CH_2– group is ....

Answer»

`ZN+ Hg//HCl`
`NH_2 - NH_2 + C_2H_5ONa`
`Mg//Hg//H_2O`
EITHER (a) or (B)

SOLUTION :either (a) or (b)
Discussion
12245.

Which of the statements is correct?

Answer»

slope of ADIABATIC P-V CURVE will be same as that of isothermal one.
Slope of adiabatic P-V curve is smaller than that in isothermal one.
Slope of adiabatic P-V curve is larger than that in isothermal one.
Slope of adiabatic P-V curve may be smaller or larger DEPENDING on the value V.

Answer :C
Discussion
12246.

What is the effect of temperature on the rate of physical adsorption ?

Answer»

SOLUTION : It DECREASES with the RISE in TEMPERATURE.
Discussion
12247.

Which of the following has plane of symmetry:-

Answer»




ALL

Answer :D
Discussion
12248.

Which of the following cell is different in terms of principle ?

Answer»

STORAGE cell
Electrolytic cell
Fuel cell
Leclanche cell

Solution :Electrolytic cell : Cell which CONVERT chemical energy into electrical energy is CALLED as electrolytic cell.
Discussion
12249.

Which of the statements regrding carbon dioxide is/are correct ? 1. It is prepared on large scale by the action of water on lime. 2. In the solid form it can be used as a refrigerant . Select the correct answer using the code given below :

Answer»

1 only
2 only
Both 1 and 2
Neither 1 nor 2

Solution :SOLID `CO_(2)` is used as a refrigerant under the commercial name tricol.
Discussion
12250.

Which one of the following on hydrolysis, gives the corresponding metallic hydroxide, H_(2)O_(2)andO_(2) ?

Answer»

`Li_(2)O`
`Na_(2)O_(2)`
`NaO_(2)`
`Na_(2)O`

SOLUTION :`2NaO_(2)+2H_(2)Oto2NaOH+H_(2)O_(2)+O_(2)`
Discussion