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8201.

Which of the following will not give positive Libermann's test?

Answer»




Solution :`C_(6)H_(5)-OH` given +ve Liebermann test. Nitro PHENOLS para substituted PHENOL do not GIVE the test
Discussion
8202.

When SCN^(-) is added to an aqueous solution containing Fe(NO_(3))_(3), the complex ion produced is

Answer»

`[Fe(OH_(2))_(2)(SCN)]^(2+)`
`[Fe(OH_(2))_(5)(SCN)]^(2+)`
`[Fe(OH_(2))_(8)(SCN)]^(2+)`
`Fe(OH_(2))(SCN)]^(6+)`

SOLUTION :When `SCN^(-)` is added to an aqueous solution containing `Fe(NO_(3))_(3)`, pentahydrated complex is FORMED.
`Fe(3+)+SCN^(-)+H_(2)Orarr[Fe(H_(2)O)_(5)SCN]^(2+)`
Discussion
8203.

What are antimalarials. Give examples.

Answer»

Solution :The chemical substances wed for the TREATMENT of malaria fever are CALLED ANTIMALARIALS. For a long time, the alkaloid quinine was used as an antimalarial but these days, a number of more potent SYNTHETIC drugs such as CHLOROQUINE, primaquine primaquine, etc. are used.
Discussion
8204.

Vitamin C is a vitamin found in fruits and vegetables. It cannot be stored in our body. Why ?

Answer»

SOLUTION :Vitamin C is water soluble and so it is READILY exerted through URINE. So it cannot be stored in the body.
Discussion
8205.

Two examples of covalent crystals are_____and_____

Answer»

SOLUTION :DIAMOND and GRAPHITE
Discussion
8206.

Which of the following pairs contains only tetrahedral complexes?

Answer»

`[MnCl_(4)]^(2-) and [NI(CN)_(4)]^(2-)`
`[ZnCl_(4)]^(2-) and [MnCl_(4)]^(2-)`
`[ZnCl_(4)]^(2-) and [Ni(CN)_(4)]^(2-)`
`[ZN(NH_(3))_(4)]^(2+) and [CU(NH_(3))_(4)]^(2-)`

Answer :B
Discussion
8207.

What is the relationship between specific conductance and equivalent conductance?

Answer»

SOLUTION :`wedge_(EQ)=(kappaxx1000)/(N)`, where `kappa` is specific conductance in S `CM^(-1)`, N is normality in g eq, `L^(-1),wedge_(eq)` is in S `cm^(2)` `(g" "eq)^(-1)`.
Discussion
8208.

Which of the following electrolytic solution has the least specific conductance

Answer»

2N
0.002N
0.02N
0.2N

Answer :B
Discussion
8209.

The reason for almost doubling the rate of reaction on increasing the temperature of the reaction system by 10^(@)C is

Answer»

The VALUE of threshold energy INCREASES
Collision frequency increases
The fraction of the molecules having energy equal to threshold energy or more increases
ACTIVATION energy decreases

Solution :When the temperature is INCREASED , heat energy is supplied which increases the kinetic energy of the reacting molecules . This will increase the number of collisions and ultimately the rate of REACTION will be enhanced .
Discussion
8210.

Which of the following has same size?

Answer»

`Fe^(2+),NI^(2+)`
`Zr^(4+),Ti^(4+)`
`Zr^(4+),Hf^(4+)`
`Zn^(2+),Hf^(4+)`

Solution :In general, the atomic and ionic radii increases on moving down in a group. But the element of second TRANSITION series (eg.,Zr,Nb,Mo ETC.,) have the ALMOST same radii as the elements of third transition series (eg.Hf,Ta,W etc). This is because of lanthanide contraction.
Discussion
8211.

Which of the following coupling reactions takes place most readily than others

Answer»




Solution :b is most READILY takes PLACE because EWG on DIAZONIUM ion INCREASES electrophilicity
Discussion
8212.

Which of the following compounds has the lowest boiling point ?

Answer»

`CaCl_(2)`
`CaBr_(2)`
`CaI_(2)`
`CaF_(2)`

Solution :`Cal_(2)` has the maximum COVALENT CHARACTER and the least BOILING point.
Discussion
8213.

Zeisel method is used to estimate

Answer»

ALCOHOLIC group
Amino group
Methoxy group
Halo group

Solution :Zeisel's method is USED to estimate the alkoxy linkages in an ORGANIC COMPOUND.
Discussion
8214.

Which of the following can be used as an analgesic without causing addictions?

Answer»

Morphine
Aspirin
Heroin
CODEINE

SOLUTION :Except aspirin, all other DRUGS are HABIT forming .
Discussion
8215.

Write the correct formulae for the following coordination compounds : CrCl_(3).6H_(2)O (violet with 3 chloride ions precipitated as AgCl)

Answer»

Solution :Chlorine atoms outside the coordination sphere react with SILVER ions to give silver chloride.
`Cr(H_(2)O)_(6)]Cl_(3)`
Hexachloridochromium(III)TRICHLORIDE
Discussion
8216.

Which one of the following nitrogen oxides is an anhydride of nitric acid?

Answer»

`N_2O_5`
`N_2O_4`
`N_2O_3`
`N_2O`

SOLUTION :`N_2O_5` is the ANHYDRIDE of nitric ACID as it gives `HNO_3`on adding WATER.
` N_2O_5 + H_2Oto2HNO_3`
Discussion
8217.

Which of the following option is correct for [Fe(H_(2)O)_(6)]^(2+)" and "[Co(H_(2)O)_(6)]^(3+) ?

Answer»

both have same magnetic moment
both are HIGH SPIN COMPLEX
`Delta_(0)gtP` for both
Splitting gap is different in both

Solution :`[Co(H_(2)O)_(6)]^(2+)` is diamagnetic and `Delta_(0)gtP`.
`[FE(H_(2)O)_(6)]^(2+)` is paramagnetic and `Delta_(0)ltP`.
Discussion
8218.

Which of the following will have three stereoisomeric forms? (i) [Cr(NO_(3))_(3)(NH_(3))_(3)] (ii) K_(3)[Co(C_(2)O_(4))_(3)] (iii) K_(3)[CoCl_(2)(C_(2)O_(4))_(2)] (iv) [CoBrCl(en)_(2)]

Answer»

(III) and (IV)
(i), (iii) and (iv)
(iv) only
all four

Solution :
Discussion
8219.

Which of the following can decarboxylated most easily ?

Answer»

`CH_(3)CH_(2)COOH`
`CH_(3)-CH=CH-COOH`

ANSWER :D
Discussion
8220.

The solubility products of AgCl and Ag_2CrO_4 are 1.5 xx 10^(-10) and 9 xx 10^(-12) respectively. Which of the following statement is correct ?

Answer»

AGCL is more SOLUBLE than `AgCrO_4`.
`Ag_2CrO_4` is more soluble than `AgCl`.
`Ag_2CrO_4` is PRECIPITATED before AgCl STARTS preecipitating.
Both AgCl and `Ag_2CrO_4` have the same solubility.

Answer :B
Discussion
8221.

Which of the followingstatement is not correct

Answer»

Hybridization is the MIXING of atomic orbitals prior to their combining into molecularorbitals
`sp^(2)` HYBRID orbitals are formed from two p atomic orbitals and one s atomic orbitals
`d^(2)sp^(3)` hybrid orbitals are directed towards the corners of a regular OCTAHEDRON
`dsp^(3)` HYBRIDE orbitals are all at `90^(@)` to one another

Solution :`dsp^(3)` hybrid orbitals have bond angle `120^(@),90^(@)`
Discussion
8222.

What is dehydrohalogenation reaction. Write its chemical reaction.

Answer»

SOLUTION :When an alkyl halide is heated with an alcoholic solution of KOH, it loses a molecule of HYDROGEN `"halide"_(HX)` to give an alkene. This reaction is called DEHYDROHALOGENATION or `beta`-ELIMINATION reaction.
e.g.
`underset("Ethyl chloride")(underset(H)underset(|)CH_(2))-underset(Cl)underset(|)CH_(2)+underset("(alc.)")KOH overset(Delta)to underset("Ethene")CH_(2)=CH_(2)+KCl+ H_(2)O`
Discussion
8223.

Treatment of toluene with a halogen in dark in the presence of Fe gives

Answer»

<P>o-Halotoluene.
p-Halotoluene.
m-Halotoluene.
MIXTURE of o- and p- Halotoluene.

ANSWER :d
Discussion
8224.

Which of the following is weak bond?

Answer»

IONIC BOND
Covalent bond
Hydrogen bond
METALLIC bond

Answer :C
Discussion
8225.

When a current of 0.75 A is passed through a CuSO_(4) solution for 25 minutes, 0.369 g of copper is deposited at the cathode. Calculate the atomic mass of copper.

Answer»

Solution :`Cu^(+)(aq)+UNDERSET(2" moles")(2e^(-)) to underset(1" MOLE")(Cu(s))`
QUANTITY of charge passed `=lxxt=(0.75A)xx(25xx60s)`
`=1125 A .S.=1125" C"`
`1125" C"` of charge deposit copper=0.369 g
`2xx96500" C mol"^(-1)` of charge deposit `=((0.369g))/((1125C))xx(2xx96500 " C mol"^(-1))=63.3" g mol"^(-1)`.
Discussion
8226.

The total number of C atoms in beta-D fructofuranose are :

Answer»

6
5
4
7

Answer :A
Discussion
8227.

What are the possible values of nifCH_(2) = (C )_(n) = CH_(2) is a non - planar molecule?

Answer»


ANSWER :N = 0,2,4
Discussion
8228.

WhenNH_(3) is treated with diborane at low temperature and then heated at 200^@C , the product formed is

Answer»

`B_(2) H_(6)`
`B_(2) N_(2) H_(6)`
`B_(3) N_(3) H_(6)`
`B_(2) H_(6) N_(2)`

SOLUTION :Ammonia is a lewis base, while diborane is a Lewis acid. Therefore at ROOM temperature they react with each other giving an addition product. Which on heating at `200^@C` gives a volatile compound KNOWN as borazole or inorganic benzene `(B_3N_3H_6)`
`B_2H_6 + 2NH_3 RARR B_2H_6 cdot 2NH_3`
`3(B_2H_6 cdot 2NH_3) overset(200^@C)(rarr) 2(B_3N_3H_6)+ 12H_2`
Discussion
8229.

Which amongthe followingfunctionalgroupshas been given the highestprioritywhile assigning R-S configuration

Answer»

`-C_(6)H_(5)`
`-CN`
`-C_(2)H_(5)`
`-CH_(3)`

ANSWER :B
Discussion
8230.

Which of the following is a carbonate ore ?

Answer»

Cuprite
SIDERITE
Zincite
Bauxite.

Solution :Siderite is a CARBONATE ORE `(PbCO_(3))`.
Discussion
8231.

Which one of the following aldehyde is derived from vitamin B, function as a co-enzyme?

Answer»

PYRIDOXAL
FORMALDEHYDE
ETHANAL
PROPANAL

SOLUTION :Pyridoxal
Discussion
8232.

Which among 1 molar NaCl and 1 molar Glucose which has greater colligative property and why?

Answer»

SOLUTION :1 molar NaCl has greater colliagative PROPERY. This is because NaCl is ionises to two particles, while GLUCOSE do not ionise in to particles.
Discussion
8233.

The techinque of separation of the components of a mixture in the solution based on their differential adsorption is called ……….

Answer»

SOLUTION :CHROMATOGRAPHY
Discussion
8234.

Which of the following types of octahedral complexes does not show optical isomerism?

Answer»

(a) `MA_2X_2Y_2`
(b) `[Pt(NH)_3)_4]^(2+)`
(c) `[M(A A)_3]^(n+)`
(d) `[M(A A)_2X_2]^(n+)`

Solution :`[Pt(NH_3)_4]^(2+)` is a square PLANAR COMPLEX having four similar ligands.
Discussion
8235.

What is the monomer of PVC ?

Answer»

Solution :Vinyl chloride or CHLOROETHENE `(CH_(2)=CHCI)`.
Discussion
8236.

Which of the following has maximum boiling point

Answer»

`CH_(3)COOH`
`HCOOH`
`C_(2)H_(5)COOH`
`C_(3)H_(7)COOH`.

Answer :D
Discussion
8237.

Which mentioned bond has highest C-H bond dissociation energy.

Answer»

1
2
3
4

Answer :A
Discussion
8238.

What type of hybridisation is associated with N in NH_3 ?

Answer»

Solution :`sp_^3` (3 BOND PAIRS + 1 lone pairs)
Discussion
8239.

Which is not true of amino acid ?

Answer»

amino ACID forms ZWITTER ion
has ISOELECTRIC point
dual BEHAVIOURS
amino acid is insoluble in NaOH solution

Solution :amino acid is insoluble in NaOH solution
Discussion
8240.

What do you understand by adsorption isotherm and adsorption isober ? Explain Freundlich adsorption isotherm for the adsorption og gas on solids.

Answer»
Discussion
8241.

Which polymer obtained from dimethyl terphthalate and ethylene glycol ?

Answer»

Nylon-6
Nylon-66
DACRON
BAKELITE

SOLUTION :Dacron
Discussion
8242.

Which of the following compound is food colours ?

Answer»

ASCORBIC ACID
Alitame 
B-Carotene
Sorbic acid 

ANSWER :C
Discussion
8243.

Write the structures of the following organic halogen compounds.2-Chloro-3-methylpentane

Answer»

Solution :`CH_(3)-CH_(2)-underset(CH_(3))underset("|")("C ")H-underset("CL ")underset("| ")("C ")H-CH_(3)`
Discussion
8244.

Which of the following compound will lose a molecule of water of treating with conc. H_2SO_4?

Answer»

`CH_3COCH_3`
`CH_3COOH`
`CH_3CH_2OH`
`CH_3OCH_3`

ANSWER :C
Discussion
8245.

Two stereoisomers (cis and trans) or 3,4-Dibromocyclopentane-1 , 1-Dicarboxylic acid undergo decarboxylation, find out the total number of products formed.

Answer»


SOLUTION :
Discussion
8246.

What is a dispersed phase in a colloid ?

Answer»

SOLUTION :In a colloidal, the substance present in less AMOUNT is called dispersed PHASE
Discussion
8247.

The temperature and pressure at which ice, liquid water and water vapour can exist together are

Answer»

`0^(@)` C,ATM
`2^(@)C`, 4.7 atm
`0^(@) `C, 4.7 mm
`-2 ^(@)C` , 4.7 mm

Solution :All the THREE phases of water can COEXIST at `0^(@)C`& 4.7 mm pressure.
Discussion
8248.

Transition electronic that show anomalous electronic configuration in first series are:

Answer»

CR and Ni
Cu and Co
Fe and Ni
Cr and Cu

Answer :D
Discussion
8249.

Which of the hydracids of halogens reacts with glass?

Answer»

Solution :HF. FLUORIDE ION due to its strong AFFINITY for Si attacks silicates and silica PRESENT in glass.
`Na_(2)SiO_3+ 6HF RARR Na_2 SiF_6 + 3H_2O`
`SiO_2 + 4HF rarr SiF_4 + 2H_2O`
Discussion
8250.

The space model which is obtained by joining the points representing various bonded atoms gives the shape of the molecule. The geometry of the molecule is definite relative arrangement of the bonded atoms in a molecule. The shape and geometry of a molecule is explained by valence shell electron pair repulsion theory given by Gillespie and Nyholm. Select the correct code for the following repulsion orders, according to VSEPR theory : (I) lone pair -lone pair gt lone pair-bond pair (II) lone pair-bond pair gt bond pair -bond pair (III) lone pair -lone pair gt bond pair-bond pair (IV) lone pair - bond pair gt lone pair-lone pair

Answer»

I,II and III
II and IV
I,II and IV
All

Answer :A
Discussion