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18451.

Which of the following statement is correct about P_(4) ?

Answer»

It will not give yellow/orange or RED COLOUR with 2,4-DNP
It willgive red colour with CERIC ammonia nitrate.
It will not give FEHLING test.
It will give Bielstine test.

Solution :
Discussion
18452.

Transition metal which forms green compounds in its +3 oxidation state and orange red compounds in its +6 oxidation state is

Answer»

COBALT
CHROMIUM
Iron
Nickel

ANSWER :B
Discussion
18453.

Which of the following is used as disinfectant ?

Answer»

`2%` of PHENOL solution
Dilute solution of boric acid
`1%` phenol solution
`2-3%` AQUEOUS solution of iodine 

Answer :C
Discussion
18454.

Write structures of different dihalogen derivatives of propane.

Answer»

SOLUTION :Dihalogen derivatives of propane are-
(X = Halogen atmo)
`H_(2) underset(X)underset(|)C-underset(X)underset(X)underset(|)(CH)-CH_(3)"" H_(2)underset(X)underset(|)C-CH_(2)-underset(X)underset(|)(CH_(2))`
`X-underset(H)underset(|)OVERSET(X)overset(X)overset(|)C-CH_(2)-CH_(3) and H_(3)C-underset(X)underset(|)overset(X)overset(|)C-OH`
`("X=Halogen ATOM")`
Discussion
18455.

Which of the following is sulphanilic acid .

Answer»




ANSWER :B
Discussion
18456.

Write the products of the following reactions : iii) CH_3-CH_2 -CH=CH_2 + HCI rarr

Answer»

SOLUTION :
III) `CH_3CH_2CH(CI)CH_3` (Markovnikov.s RULE)
Discussion
18457.

Two flasks of equal volume contain SO_(2) and CO_(2) respectively at 25^(@)C and 2 atm pressure. Which of the following is equal in them ?

Answer»

MASSES of the two GASES
number of molecules
rates of effusion
molecular structure.

Solution :Equal volumes of all gases under SIMILAR conditions of temperature and pressure CONTAIN equal number of molecules.
Discussion
18458.

White lung cancer is caused by

Answer»

ASBESTOS
silica
textiles
paper

Solution :asbestos
Discussion
18459.

What happens when acetyl chloride reduced with LiAlH_(4) ?

Answer»

SOLUTION :Ethyl CHLORIDE is FORMED
`UNDERSET("Acetyl chloride")(CH_(3)COCl)+4[H] overset(LiAlH_(4))to underset("Ethyl alcohol")(CH_(3)CH_(2)OH)+HCl`
Discussion
18460.

The root mean square velocity of hydrogen at S.T.P.is

Answer»

`1.8 XX 10^5 CM SEC^(-1)`
`3.6 xx 10^5 cm sec^(-1)`
`1.8 xx 10^10 cm sec^(-1)`
`1.8 xx 10^8 cm sec^(-1)`

ANSWER :A
Discussion
18461.

Total number of faces in a truncated ocrahedron=x Total number of faces in a truncated tetrahedron=y Then x+y is :

Answer»


Solution :In truncated OCTAHEDRON : Hexagonal faces=8
Square faces=6
In truncated tetrahedron: Hexagonal faces=4
Triangular faces=4
TOTAL faces =22
Discussion
18462.

What happens when ethylene reacts with alkaline KMnO_(4) solution

Answer»

Solution :When ethylene REACTS with alkaline `KMnO_(4)` solution (Baeyer's reagent), it forms glycol (DIOL.)
`UNDERSET("Ethylene") (CH_(2)) = CH_(2) + H_(2)O +[O] OVERSET("dilute")underset("alkaline" KMnO_(4)) to underset("Ethylene glycol")underset(CH_(2)OH) underset(|)(CH_(2)OH)`
Discussion
18463.

Which of the following contains nitrogen ?

Answer»

TEFLON
NYLON
Terylene
Starch

ANSWER :B
Discussion
18464.

Which one of the following is used in the manufacture of cosmetics and transparent soaps?

Answer»

METHANOL
ETHANOL
GLYCEROL
Phenol

Solution :Glycerol
Discussion
18465.

Which of the following has the highest molar conductivity in solution:

Answer»

`[PT(NH_3)_6]CI_4`
`[Pt(NH_3)_5CI]CI_3`
`[Pt(NH_3)_4CI_2]CI_2`
`[Pt(NH_3)_3CI_3]CI_2`

ANSWER :A
Discussion
18466.

Write down the IUPAC name of the following complex: [Cr(en)_(3)]Cl_(3)

Answer»

Solution :`[Cr(en)_(3) ]Cl_(3)`
[TRIS( ethane-1, 2-diammine )CHROMIUM(III)] chloride
Discussion
18467.

Which isomer of C_(4)H_(8) produces same compoun with HBr in presence and absence of peroxide ?

Answer»

1-butuene
2-butene
Isobutylene
Propene

Answer :B
Discussion
18468.

The volume of oxygen at NTP Liberated by 5 ampere current flowing for 193 second though acidulated water is :

Answer»

56
112
224
`5.6`

ANSWER :A
Discussion
18469.

Which formulae represents an alkane

Answer»

`C_(10)H_(30)`
`C_(7)H_(16)`
`C_(6)H_(18)`
`C_(5)H_(8)`

ANSWER :B
Discussion
18470.

The vapour pressure of a solvent decreased by 10mm of mercury, when a non-volatile solute was added to the solvent. The mole fraction of the solute in the solution is 0.2. What should be the mole fraciton of the solvent, if decrease in the vapour pressure is to be 20 mm of mercury

Answer»

<P>`0.8`
`0.6`
`0.4`
`0.2`

Solution :`THEREFORE P^(@) -P_(s) =P^(@)XX` mole fraction SOLUTE
`10=P^(@)xx0.2, 20=P^(@)xx n RARR n=0.4 therefore N =0.6`.
Discussion
18471.

Which compound would give 5-keto-2-methyl hexanal upon ozonolysis ?

Answer»





SOLUTION :
Discussion
18472.

What are chemical twins ? Give examples.

Answer»

Solution :(1) A pair of elements having similar properties due to similar atomic RADII are called chemical TWINS and they are d-block elements of 5TH and 6TH period or 4d-series and 5d-series respectively.
(2) They are Zr and Hf, Nb and Ta, Mo and W, Tc and Re.
(3) This effect arises due to lanthanoid contraction.
Twin elements :
`|{:("Zr (145 pm)","Nb (134 pm)","Mo (129 pm)","Tc (114 pm)"),("Hf (144 pm)","Ta (134 pm)","W (130 pm)","Re (114 pm)"):}|`
Discussion
18473.

Write the equations for the preparation of 1-iodo-butane from- 1-butanol

Answer»

Solution :`underset("Butan"-1-ol)(CH_(3)CH_(2)CH_(2)CH_(2)OH)overset(red P)underset(I_2)(RARR)underset(1-"iodobutane")(CH_(3)CH_(2)CH_(2)CH_(2)I)`
Discussion
18474.

Which of the following reactions will not result in the formation of carbon-carbon bonds?

Answer»

Freidel-crafts acylation
Reimer-Tiemann REACTION
Cannizzaro reaction
Wurtz reaction

Solution :Cannizzaro reaction does not involve formation of NEW C-C bonds.
Discussion
18475.

Which one is unstable at cooking temperature ?

Answer»

Saccharin
Sucrolose
Alitame
ASPARTAME 

SOLUTION :Aspartame
Discussion
18476.

Writes the chemical equation for Williamson synthesis of 2-ethoxy - 2- methyl pentane starting from ethanol and 2 - methyl pentan -2-ol

Answer»

SOLUTION :
Williamsons synthesis OCCURS by `SN^2` -mechanism and primary alkyl halides are more REACTIVE in `SN^(2)` reactions. Therefore ethanol is converted into ethyl BROMIDE.
Discussion
18477.

What is Mendius reaction ?

Answer»

Solution :`underset("CYANIDE")underset("Alkyl")(RNC) + 4[H] overset(Na//alc)tounderset("(Primary amine)")(RCH_2NH_2)`
Discussion
18478.

What are monosaccharides?

Answer»

Solution :Monosaccharides are carbohydrates which cannot be hydrolysed to SMALLER molecules. Their general formula is `(CH_(2)O)_(n)`, where n = 3-7. Those which contain an aldehyde GROUP (CHO) are called aldoses and those which contain a keto (C = O) group are called KETOSES. They are further classified as trioses, tetroses, pentoses and hexoses according as they contain 3, 4, 5 and 6 carbon atoms, respectively. Examples of some monosaccharides are given below:
Discussion
18479.

Two liquids A andB have vapour pressures 500 and 200 torr respectively at a certain temperature. In an ideal solution of the two, the mole fraction of A at which two liquids have equal partial pressures is :

Answer»

`0.50`
`0.20`
`0.286`
`0.714`

SOLUTION :Let the MOLE FRACTION of A is `X`
Mole fraction of `B=1-x`
`500x=200(1-x)`
or `700 x=200` or `x=(200)/(700)=2/7=0.286`
Discussion
18480.

The sulphide, which is orange red is

Answer»

`Sb_(2)S_(3)`
`As_(2)S_(3)`
CDS
`Ag_(2)S`

ANSWER :A
Discussion
18481.

Which of the following is correct statement for 'Interstitial defect'?

Answer»

Some of the lattice site are vacant. 
This defects increase the number of atom for a unit VOLUME. 
This defects increase the density of substance. 
Particles like atom or molecule get arrangedin the interstitial site of the CRYSTAL. 

Answer :B::C::D
Discussion
18482.

Which of the following chemical contains chlorine

Answer»

FISCHER SALT
EPSOM salt
Fremy's salt
SPIRIT of salt

ANSWER :D
Discussion
18483.

Which of the following pairs of structures does not represent isomers ?

Answer»




ANSWER :D
Discussion
18484.

Which of the following compounds will not liberate ammonia gas on refluxing with aqueous NaOH?

Answer»

`C_(6)H_(5)CN`


`Ph-OVERSET(O)overset(||)(C )-NH-CH_(3)`

Answer :D
Discussion
18485.

Which is not oxidized by MnO_2

Answer»

F
Cl
`I_(2)`
l

SOLUTION :Fluorine can not be oxidised by even STRONGEST oxidizing AGENT.
Discussion
18486.

Which of the following compounds have the same value of vant Hoff's factor (i) as that of Al_(2)(SO_(4))_(3) ?

Answer»

`K_(4)[FE(CN)_(6)]`
NaCl
`Al(NO_(3))_(3)`
`Na_(2)SO_(4)`

Answer :A
Discussion
18487.

Which of the following compound(s) will give red colour with FeSO_(4) + KCNS after keeping open in sunlight for sametime?

Answer»




Ph-O-Ph

Solution :N//A
Discussion
18488.

Total how many organic product (s) will be formed when 4-methylcyclohexoxy-3-methylcyclohexane is hydrolysed ?

Answer»


SOLUTION :N//A
Discussion
18489.

What is an adsorption isoterm? Describe Freundlich adsorption isotherm.

Answer»

Solution :A graph drawn between EXTENT of ADSORPTION and the pressure of the gas at constant temperature is called adsorption isotherm
A relationship between the amount adsorbed `(x//m)` and the equilibrium pressure (p) can be given by
`x/m = kp^(1//m)`
where, n is a positive INTEGER and K is the constant.
This is known as Freundlich adsorption isotherm.
Discussion
18490.

Which of the following is not an exact differential ?

Answer»

dq
dG
`DBAR(V)`
dS

Answer :A
Discussion
18491.

What would be the standard internal energy change for the reaction,OF_2(g) + H_2O (g) to O_2(g) + 2HF(g) at 298 K? The standard enthalpies of formation of OF_2 (g), H_2O(g), HF(g) are +20, +250 and -270 kJ "mol"^(-1)

Answer»

`352 XX 10^2 KJ`
`410 xx 10^5 kJ`
`3.12 xx 10^2 kJ`
`5.26 xx 10^4 kJ`

SOLUTION :`3.12 xx 10^2 kJ`
Discussion
18492.

Which is a stronger reducing agent, SbH_(3) or BiH_(3), and why ?

Answer»

Solution :As we move down the group 15 elements from SB to Bi, the atomic size increases and hence the strength of the BOND it makes with hydrogen decreases, i.e., Bi-H bond is weaker than Sb-H bond. In other words, `BiH_(3)` is THERMALLY less stable than `SbH_(3)`. Therefore, on heating, `BiH_(3)` has a greater tendency to liberate hydrogen than `SbH_(3)` and hence `BiH_(3)` is a stronger reducing agent than `SbH_(3)`.
Discussion
18493.

Which oxide cannot be reduced by C ?

Answer»

`Cu_2O`
`Fe_2O_3`
ZNO
`Al_2O_3`

ANSWER :D
Discussion
18494.

The structure of glyclne (amino acid) is H_3N^+CH_2COO^- (Zwitter Ion). Select the correct statement of the following.

Answer»

Glycine, as well as another AMINO acids are amphoteric.
The acidic functional GROUP in amino acids is `-NH_(3)^(+)`
The basic functional group in amino acids is `-CO_2`
All the STATEMENT are correct

Answer :D
Discussion
18495.

Which of the following phenols is most soluble in aqueous sodium bicarbonate?

Answer»

<P>`2,4`-dihydroxyacetophenone
`p`-cyanophenol
`3,4`-dicyanophenol
`2,4,6`-trichyanophenol

Solution :N//A
Discussion
18496.

Write the chmical reaction occurring in the preparation of fluorobenzene from aniline.

Answer»

SOLUTION :
Discussion
18497.

Which of the following is called PABA?

Answer»

p-nitro benzanilic ACID
p-amino BUTYRIC acid
p-amino BENZENE sulphonic acid
p-amido benzene SULPHONYL chloride

Solution : p-amino benzene sulphonic acid
Discussion
18498.

What is the formula of ''Pyrene'' ?

Answer»

`C Cl_(3)CH(OH)_(2)`
`CHCl_(3)`
`C Cl_(4)`
`CH_(3)Cl`

Solution :`C Cl_(4)` is used under the NAME pyrene for extinguishing the FIRE in substances.
Discussion
18499.

Which ofthe following maybest be called aromatic ?

Answer»




Discussion
18500.

Which statements are correct for the peroxide ion?

Answer»

It has five completely filled anti-bonding molecular orbitals.
It is diamagnetic
it has BOND order one
it is isolectronic with neon

Solution :`O_(2)^(2-)(18):(sigma1s)^(2):(sigma1s)^(2)(sigma*1s)^(2)(sigma2s)^(2)(sigma*2s)^(2)`
`(sigma2p_(Z))^(2)(pi2p_(x))^(2)(pi2p_(y))^(2)(pi*2p_(x))^(2)(pi*2p_(y))^(2)`
`:.` No. unpaired electrons = diamagnetic
BORDER order `=(10-8)/2=1`
Discussion