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22451.

Which of the following bonds is the strongest?F-F,Cl-Cl,I-I,Br-Br.

Answer»

`F-F`
`Cl-Cl`
`I-I`
`Br-Br`

ANSWER :B
Discussion
22452.

Which of the following represents the correct order of acidity in the given compounds

Answer»

`FCH_(2) CO OH gt CH_(3) CO OH gt BrCH_(2) COOH gt ClCH_(2) COOH`
`FCH_(2) COOH gt ClCH_(2) COOH gt BrCH_(2) COOH gt CH_(3) COOH`
`CH_(3) COOH gt ClCH_(2) COOH gt FCH_(2) COOH gt Br - CH_(2) COOH`
`Cl CH_(2) COOH gt CH_(3) COOH gt BrCH_(2) COOH gt ICH_(2) COOH`

SOLUTION :`-I` EFFECT increases the acidity. If electronegativity is high, -I effect is ALSO high.
Discussion
22453.

Which of the following is a biodegradable polymer

Answer»

A,B,C
B,C,D
A,D
All are correct

ANSWER :C
Discussion
22454.

Which metal can be purified by distillation ?

Answer»

CU
Ag
Fe
Hg

Answer :D
Discussion
22455.

Which of the following cannot be oxidised by the acidified solution of KMnO_(4)

Answer»

`FeSO_(4)`
`FeC_(2)O_(4)`
`Fe_(2)(C_2O_4)_3`
`Fe_(2)(SO_4)_3`

ANSWER :D
Discussion
22456.

What are disaccharides ? Give one example.

Answer»

Solution :Disaccharides on hydrolysis give two molecules of the same or DIFFERENT monosaccharides. For EXAMPLE, sucrose, MALTOSE , LACTOSE , etc.
Discussion
22457.

Which of the following having delocalised electron

Answer»

Benzene
Cyclohexane
`CH_4`
`C_2H_6`

ANSWER :A
Discussion
22458.

Whatwill be the effect of temperature on rate constant?

Answer»

Solution :Rate constant of a reaction increases with increases in TEMPERATURE. It is NEARLY doubled for every ten DEGREE rise in temperature. The EXACT dependence of the rate constant on temperature is given by Arrhenius equestion.k=`Ae^((-E)/(RT))`
Discussion
22459.

Using valence bond theory explain geometry, hybridisation and magnetic property of [CoF_6]_3^- (Atomic number of Co = 27).

Answer»

Solution :In this complex, the oxidation state of Co is +3. The electronic configuration ofcobalt in +3 oxidation state is `[Ar]3d^(6) 4s^(0)`.
Orbitals of `Co^(3+)` ion are represented as

Since `F^(-)` ion provides a WEAK ligand field, one 4s, three 4p and TWO OUTER 4d-orbitals hybridised to yield six sp.d hybrid orbitals pointing towards the six corners of an octahedron.

These six hybridised orbitals of `Co^(3+)` overlaps with orbitals of six `F^(-)`ligands and six pairs of electrons donated by six F-to form six coordinate bonds.

Six `sp^(3)d^(2)` hybrid orbitals with six pairs of electrons from ligands.
Thus, the complex has octahedral geometry. This complex is paramagnetic becauseof the presence of unpaired electrons,.
Discussion
22460.

The temperature at which the reaction, Ag_2O(s)rarr2Ag(s)+I//2O_2(g) is at equilibrium is…….., Given triangleH=30.5 kJ mol^-1 and triangle S=0.066 kJ K^-1 mol^-1:

Answer»

462.12 K
362.12 K
262.12 K
562.12 K

Answer :A
Discussion
22461.

Which of the following compounds is resistant to nucleophilic attack by hydroxyl ions?

Answer»

Methyl acetate
Acetonitrile
Acetamide
DIETHYL ether

Solution :Diethyl ether itself being a LEWIS BASE is not attacked by nucleophiles, i.e., `OH^(-)` ions while all others contains either a C=O or `C-=N` group while is easily attacked by `OH^(-)` ion.
Discussion
22462.

Which one of the following is not correct regarding interstitial compounds ?

Answer»

They RETAIN metallic conductivity
They are CHEMICALLY inert
They have low melting POINTS
They are very hard

ANSWER :C
Discussion
22463.

You are given benzene, conc. H_(2)SO_(4), and NaOH. Write the equations for the preparation of phenol usign these regents.

Answer»

Solution :`underset("Benzene")(C_(6)H_(6)) underset(("SULPHONATION"))overset("Conc. "H_(2)SO_(4),Delta)to underset("Benzenesulphonic acid")(C_(6)H_(5)SO_(3)H) underset(-Na_(2)SO_(3))overset("NaOH, fuse, "573K)to underset("Sod. Phenoxide")(C_(6)H_(5)ON a) underset(-NaCl)overset("Dil. HCl")to underset("Phenol")(C_(6)H_(5)OH)`
Discussion
22464.

Which one of the following reactions is an example for calcination process

Answer»

`2AG + 2 HCl + (O) to 2 AgCl + H_(2)O`
`2 ZN + O_(2) to 2 ZnO`
`2 ZnS + 3 O_(2) to 2 Zn O + 2 SO_(2)`
`MgCO_(3) to MGO + CO_(3)`

Answer :D
Discussion
22465.

The Value ofDeltaG^(@) for the formation of Cr_(2)O_(3) is -"540KJ mol"^(-1) and that of Al_(2)O_(3) is -827"KJ mol"^(-1). Is the reduction of Cr_(2)O_(3) possible with Al ?

Answer»

Solution :`Cr_(2)O_(3)+2Alrarr Al_(2)O+2Cr, DELTAG^(+)=-827-(-540)=-287kJ`.
For the REDUCTION of `Cr_(2)O_(3)` with `AL, DeltaG^(@)` is negative and hence is POSSIBLE.
Discussion
22466.

Which of the following element outermost orbit's last electron has magnetic quantum number m = 0?

Answer»

Na
O
Cl
N

Solution :`""_(11)Na=1s^(2)2s^(2)2P^(6)3S^(1)`
i.e., for the electron, l=0
`thereforem=0`
Discussion
22467.

Which of the following is not characteristic of X-rays?

Answer»

The RADIATIONS can ionise the gas
It CAUSES ZnS to fluorescence
Deflected by electric and MAGNETIC FIELDS
Have wave length shorter than ultraviolet

Solution :N/
Discussion
22468.

Which of the following order is / are incorrect for bond angle?

Answer»

`NH_(3)ltPH_(3)ltAsH_(3)ltSbH_(3)`
`OF_(2)ltOCl_(2)ltOBr_(2)gtH_(2)O`
`BF_(3)ltBCl_(3)ltBBr_(3)ltBI_(3)`
`NO_(2)^(+)gtNO_(2)^(-)gtNO_(3)^(-)`

Solution :`BF_(3)=BCl_(3)=BBr_(3)=BI_(3)`
Discussion
22469.

Which of the following metal fons cannot form both high spin and low spin octahedral complexes(B) (C) (D)

Answer»

`TT^(3+)`
`Co^(2+)`
`FE^(2+)`
`CU^( 2+)`

SOLUTION :(A) and (D)
Discussion
22470.

Which of the following is not isoelectronic ?

Answer»

` NO^ - `
` CN^ -`
` N_2 `
`O_2^(2+)`

ANSWER :A
Discussion
22471.

Which one of the following has maximum number of atoms of oxygen?

Answer»

2 g of CARBON monoxide
2 g of carbon dioxide
2 g of SULPHUR dioxide
2 g of water

Solution :Maximum number of atoms of OXYGEN:
`CO = ((2)/(28))`, `CO_(2) = ((2)/(44))` ,`SO_(2)((2)/(64))`, `H_(2)O((2)/(18))`
Number of atoms of oxygen = `((2)/(28) xx 6.023 xx 10^(23)),((2 xx 2)/(44) xx 6.023 xx 10^(23))`, `((2 xx 2)/(64) xx 6.023 xx 10^(23))`
`((2)/(18) xx 6.023 xx 10^(23))` maximum.
Discussion
22472.

Write the products in the following: H_(3)C-underset(CH_(3))underset(|)overset(CH_(3))overset(|)C-Oh underset(358 K)overset(20% H_(3)PO_(4))to

Answer»

Solution :`UNDERSET("2-methylpropane")(CH_(3)-overset(CH_(3))overset(|)C=CH_(2)+H_(2)O)`
Discussion
22473.

White vitriol is:

Answer»

`CuSO_4cdot5H_2O`
`FeSO_4cdot7H_2O`
`ZnSO_4cdot7H_@O`
`NiSO_4cdot5H_2O

Answer :C
Discussion
22474.

Which of the following orbial has zero orbital angular momentum.

Answer»

3p
4s
3d
4f

Answer :B
Discussion
22475.

Which of the following reactant will give the same product as (III) ,(ii),(Q) with NaOI ?

Answer»


`CH_(3)-OVERSET(O)overset(||)(C)-Ooverset(O)overset(||)(C)-CH_(3)`
`CH_(3)O-overset(O)overset(||)(C)-CH_(2)overset(O)overset(||)(C)-OCH_(3)`
`CH_3-CH_(2)overset(O)overset(||)(C)-CH_(3)`

ANSWER :D
Discussion
22476.

Write the equation for the preparation of polypropylene.

Answer»

SOLUTION :
Discussion
22477.

Which of the following methods is (are) used to prepare colloidal sols?

Answer»

Hydrolysis
Double decomposition
Oxidation and reduction
All of these

Answer :D
Discussion
22478.

Write the possible isomers for the forumula C_7H_8O with their names.

Answer»

SOLUTION :`C_7H_8O`
(i) `C_6H_5- CH_2OH` : BENZYL ALCOHOL(II) `C_6H_5-O - CH_3`: ANISOLE
Discussion
22479.

Which gas is used to imporve the atmosphere of crowded places ?

Answer»

`H_(2)`
`O_(2)`
`O_(3) `
`N_(2)O`

ANSWER :C
Discussion
22480.

What causes brownian motion in colloidal dispersion?

Answer»

SOLUTION :The bombardment of colloidal particles by the molecules of the dispersion MEDIUM from DIFFERENT directions with different forces causes Brownian motion. It STABILIZES the sol.
Discussion
22481.

Which of the following reactions belong to elecrophilic aromatic substitution?

Answer»

BROMINATION of acetanilide
Coupling reaction of salts
Diazotisation of aniline
Acylation of aniline

Solution :Only (a) bromination of acetanilide and (b) coupling reaction of ARYLDIAZONIUM salts are electrophilic AROMATIC substitution reactions while diazotisation and acylation of aniline involves reaction only at the nitrogen atom.
Discussion
22482.

Whichof the following ores are concentrated by Froth flotation

Answer»

Oxiden ores
Chloride ores
Sulphide ores
Nitride ores

Answer :C
Discussion
22483.

The slow interconversion of alpha - D glucose beta - D glucoseviaopen chain formunderequilibrium is called …………

Answer»

SOLUTION :MUTAROTATION
Discussion
22484.

Write the mathematical expression for Freundlich adsorptionisotherm.

Answer»

SOLUTION :Freundlich adsorption isotherm gave an empirical relationshipbetween the quantity of GAS adsorbed by unit mass of solid adsorbent and pressure at a PARTICULAR temperature. The relationship can be EXPRESSED by the FOLLOWING equation.
`(x)/(m)=KP^(1//n)`
Discussion
22485.

Whatarethemaincomponents ofinvar ?

Answer»

SOLUTION :It ISAN alloysteelcontainingFe (64 %) andNi (36 %).
Discussion
22486.

Two friends Rohit and John, students of chemistry once discussing on periodic table, reach to a conclusion that because of Aufbau rule and other principles their thoughts are restricted for further discussion on electronic arrangements of atoms.They decided not be obey Aufbau rule and capacity of each orbital is increased to three electrons i.e. instead of two each orbital can take maximum of three electrons.Now on th basis of new arrangement of rohit and john answer the following questions assuming the total no of elements is 112. What is the block of the elements with atomic number 9,28,44 ?

Answer»

<P>s,p,d
p,s,d
p,d,s
d,p,s

Solution :NA
Discussion
22487.

Which one of the following is reduced with zinc and hydrochloric acid to give the corresponding hydrocarbon?

Answer»

ETHYL acetate
acetic acid
acetamide
butan-2-one

Solution :Zn/HCl reduces only ketones (and not esters, ACIDS and amides) to the CORRESPONDING hydrocarbons.
Discussion
22488.

Two friends Rohit and John, students of chemistry once discussing on periodic table, reach to a conclusion that because of Aufbau rule and other principles their thoughts are restricted for further discussion on electronic arrangements of atoms.They decided not be obey Aufbau rule and capacity of each orbital is increased to three electrons i.e. instead of two each orbital can take maximum of three electrons.Now on th basis of new arrangement of rohit and john answer the following questions assuming the total no of elements is 112. What is the number of elements in third period and fifth period respectively ?

Answer»

12,27
27,22
12,22
22,27

Solution :NA
Discussion
22489.

Which of the following fibres has water repellent property?

Answer»

Jute
Silk
Dacron
 ACETATE RAYON

ANSWER :C
Discussion
22490.

Which of the following enzyme catalyse the hydrolysis of starch into maltose?

Answer»

maltase
invertase
DIASTASE
zymase

Solution :diastase
Discussion
22491.

Which one of the following give a base when passed through anion exchange resin[R_(4)N^(+)]OH^(-) ?

Answer»

`K_(4)[Fe(CN)_(6)]`
`[Co(en)_(3)]Cl_(3)`
`[CO(NH_(3))_(6)]Cl_(3)`
`[Fe(H_(2)O)_(6)]SO_(4)`

Solution :Ais anionic camplex , which GIVES KOH . Others are CATIONIC complexes .
Discussion
22492.

Which of the following is correct for both as a Bronsted acid and Bronsted base ?

Answer»

HCL
`H_(3)PO_(4)`
`HCO_(3)^(-)`
`O^(2-)`

Answer :C
Discussion
22493.

Which of the following molecules is linear ?

Answer»

`SnCl_(2)`
`NO_(2)^(+)`
`H_(2)O`
`CO_(3)^(2-)`

SOLUTION :`NO_(2)^(+)` MOLECULE is linear.
Discussion
22494.

Which of the following statement regarding the projections shown below is true ?

Answer»

a' and 'b' both REPRESENT the same configuration
Both 'a' and 'b' are optically active
b' ALONE is optically active
a' alone is optically active

Answer :C
Discussion
22495.

Which reahent is useful in coverting 1-butanol to 1-bromobutane

Answer»

`CHBr_(3)`
`Br_(2)`
`CH_(3)Br`
`PBr_(3)`

Solution :`3CH_(3)CH_(2)CH_(2)CH_(2)-OH + PBr_(3) to 3CH_(3)CH_(2)CH_(2)CH_(2)-Br+H_(3)PO_(3)`
Discussion
22496.

Which of the following are natural polymers

Answer»

Proteinsto AMINO acids
Cellulose
Teflon
Natural RUBBER

Solution :All are natural Polymers wheras (c) teflon is a synthetic POLYMER
Discussion
22497.

When the temperature is raise from 300 K to 400 K the rate of a reaction is increased by 10^(8) times. What is the energy of activation?

Answer»

44.1 Kcal
22.5 Kcal
28.2 Kcal
18.6 Kcal

Solution :`LOG((K_(2))/K)=(Ea)/(2.303R)(1/(T_(1))-1/(T_(2))),log_(10)10^(8)=(epsilon_(8))/(2.303xx2)(1/300-1/400)`
`8xx1=(epsilon_(a))/(2.303xx2)xx((400-300)/(300xx400)),epsilon_(a)=(8xx2.303xx2xx300xx400)/100=44217.6` cal =44.2176 Kcal
Discussion
22498.

Which of the following alloys is used for making magnet for hearing Aids?

Answer»

INVAR
Monel metal
Alnico
German silver

Solution :Invar is an ALLOY of Fe/Ni
Discussion
22499.

Half-life for certain radioactive element is 5 min. Four nuclei of that element are observed at a certain instant of time. After 5 minutes STATEMENT-I: It can be definitely said that two nuclei will be left undecayed. STATEMENT-II: After half-life that is 5 minutes, half of totan nuclei will disintegrate. So, only two nuclei will be left undecayed.

Answer»


SOLUTION :Calculation is applicable on the LARGE AMOUNT of ratio active SUBSTANCE and it is propable.
Discussion
22500.

Which pair of the following has maximum and minimum ionic character respectively

Answer»

`RBCL`, `BeCl_2`
`LICL, RbCl`
`RbCl`, `LiCl`
`RbCl`, `AGCL`

ANSWER :A
Discussion