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15801.

Which among the following gas will be adsorbed most readily by activated charcoal?

Answer»

`SO_2(G)`
`O_2(g)`
`N_2(g)`
`H_2(g)`

SOLUTION :`SO_2` (g) This is DUE to LARGER critical temperature of `SO_2`(g).
Discussion
15802.

Transition elements get hydrolysed because they have

Answer»

VACANT ORBITALS
HIGH ATOMIC WEIGHTS
 unpaired electrons
fully filled orbitals

Answer :A
Discussion
15803.

Which one of the following is a natural rubber?

Answer»

Buna-S
Buna-N
cis-1,4-poly ISOPRENE
neoprene

Solution :cis-1,4-poly isoprene
Discussion
15804.

Which of the following ligand can exhibit linkage isomerism?

Answer»

`CN^(-)`
`NO_(2)^(-)`
`SCN^(-)`
All of these

ANSWER :D
Discussion
15805.

Which of the following is least polar and most stable conformer as compared to its other conformers.

Answer»




SOLUTION :
Discussion
15806.

Which of the following are examples of synthetic detergents ?

Answer»

`CH_3(CH_2)_(16)CH_2OSO_3N_9``CH_3(CH_2)_(16)COO(CH_2CH_2O)_8CH_2CH_2OH`
`CH_3(CH_2)OVERSET(+)N(CH_3)_3Cl^(-)`

ANSWER :A::B::C::D
Discussion
15807.

What is crystal field splitting energy?

Answer»

Solution :In a transition metal ion, all the five d orbitals are DEGENERATE but when it is INVOLVED in a COMPLEX FORMATION, the degeneracy is split. This is called crystal field splitting.
Discussion
15808.

Which ofthe following statements concerning transition metal is false ?

Answer»

They are all METALS.
They easily FORM complex coordination compounds.
Compounds containing their ions are coloured.
They SHOW multiple oxidation states always differing by two units.

Answer :D
Discussion
15809.

Which of the following statements (s) is/are correct for group-II metals

Answer»

On decreasingdown the group, the lattice energy as WELL as hydration energy decreases
Only `BeF_(2)` is soluble whereas `MgF_(2),CaF_(2),SrF_(2)` and `BaF_(2)` are insoluble
`BeCl_(2)` is insoluble whereas `MgCl_2,CaCl_(2),SrCl_(2)` and `BaCl_(2)` are soluble
`BeSO_(4)` is soluble whereas `BsO_(4)` is insoluble

Solution :The lattice energy and hydration energy decreases down the group. `BeF_(2)` has a high hydration energy wheras SALTS `MgF_(2), CaF_(2),SrF_(2)` and `BaF_(2)` are insoluble because for these, the hydration energy is not able to compensate the lattice energy. `BeCl_(2)` is COVALENT hence insoluble in water. while `MgCl_(2),CaCl_(2),SrCl_(2)` and `BaCl_(2)` are ionic and are soluble in water through their solubility decreases down the group. `BeSO_(4)` is soluble due to the high hydration energy of `Be^(2+)` whereas hydration energy decreases down the group and the hydration energy is not able to compensate for the high lattice energy.
Discussion
15810.

Which of the following is not a common antacid ?

Answer»

NaOH
KOH
`Mgt(OH)_(2)`
HCI

Answer :C
Discussion
15811.

Which of the following carbocations is expected to be most stable?

Answer»




ANSWER :D
Discussion
15812.

The velocity of electron in the hydrogen atom is 2.2xx10^6 m/s. Thede Broglie wavelength for this electron is:

Answer»

33 nm
45.6 nm
23.3 nm
0.33 nm

Answer :D
Discussion
15813.

Which of the following compounds will dissolve in an alkali solution after it undergoes reaction with Hinsberg's reagent ?

Answer»

`CH_(3)CH_(2)`
`(CH_(3))_(3)N`
`(C_(2)H_(5))_(2)NH`
`C_(6)H_(5)NHC_(6)H_(5)`

Solution :`1^(@)` Amines from benzene sulphonamides which are soluble in alkali.
Discussion
15814.

Which of the following alkyl halides is most reactive in the Williamson reaction ?

Answer»




Solution :Allyl bromide `(CH_2=CH-CH_2-Br)` Which is `1^(@)` alkyl HALIDE and allylic CARBOCATION is resonance stablised ALSO.
Discussion
15815.

Which of the following compounds are more reactive towards NaOH.

Answer»

`CH_3CH_2Cl`


`CH_3CH = CHCl`

SOLUTION :Due to formation of stable carbocation BENZYL CHLORIDE is more REACTIVE towards NaOH (`SN^1` mechanism)
Discussion
15816.

Write the structural formula of 1, 1 - dimethoxy ethane. How is it prepared from ethanal?

Answer»

SOLUTION :
Preparation : When ACETALDEHYDE is TREATED with 2 EQUIVALENT of methanol in presence of HCl, 1, 1, - dimethoxy ethane is obtained.
Discussion
15817.

When H_(2)S is added to acidic dichromate solution, the colour of the solution changes to …..

Answer»

Yellow
Blue
Green
Milky

Answer :D
Discussion
15818.

Which of the following is not usefull for the synthesis of ether ?

Answer»


`CH_2N_2 + R-OH overset(HBF_4)to `

`2ROH overset(Conc. H_2SO_4 //413 K)to`

ANSWER :A
Discussion
15819.

The value of Delta_fG^@ for formation of Cr_2O_3 is -540 kJ mol^(-1) and that of Al_2O_3 is -827 kJ mol^(-1). Is reduction of Cr_2O_3 possible with Al ?

Answer»

Solution :The two equations are :
(i) `4//3Al(s) + O_2(g)to 2//3Al_2O_3(s),Delta_fG^@ = - 827 kJ MOL^(-1)`
(ii) `4//3Cr(s) + O_2(g) to 2//3Cr_2O(s) : Delta_fG^@ = - 540 kJ mol^(-1)`
SUBTRACTING Eq. (ii) from Eq. (i), we get
`4//3 Al(s) + 2//3 Cr_2O_3(s) to 2//3 Al_2O_3 (s) + 4//3 CR(s): Delta_rG^@ = - 287 kJ mol^(-1)`
Since `Delta_rG^@` of the combined redox reaction is negative, therefore, REDUCTION of `Cr_2O_3` by Al is POSSIBLE.
Discussion
15820.

What happens to freezing point of benzene when naphthalene is added

Answer»

Increases
DECREASES
Reamains UNCHANGED
FIRST decreases ANDTHEN increases

Answer :B
Discussion
15821.

What is the mole fraction of a solute in 2.5 m aqeous solution?

Answer»

Solution :2.5 m aqueous solution means 2.5 moles of the SOLUTE are present in 1000 g of WATER, i.e.,
`"Moles of solute = 2.5,Moles of solvent"=(1000)/(18)=55.55`
`THEREFORE"Moles FRACTION of solute in the solution"=(2.5)/(2.5+55.55)=0.043`
Discussion
15822.

Which of the following represents Avogadro's hypothesis ?

Answer»

GASES react TOGETHER in volumes which bear a simple RATIO to ONE another
One mole of all gases occupies 22.4 L at N.T.P.
Equal volumes of all gases under the same conditions of temperature and pressurecontain equal number of atoms.
Equal volumes of all gases under the SAMECONDITIONS of temperature and pressurecontain equal number of molecules

Solution :Gases react together in volumes which bear a simple ratio to one another
Discussion
15823.

Which of the following reagents turns white precipitate of AgCl yellow ?

Answer»

`NaNO_(3)`
`Na_(3)AsO_(3)`
`Na_(3)AsO_(4)`
NaCN

Answer :B
Discussion
15824.

What is rectified spirit?

Answer»

Solution :It CONTAINS `95.6%C_(2)H_(5)OH` and rest `CH_(3)OH` or pyridine.
Discussion
15825.

The number of asymmetric carbon atoms present in glucose is ______.

Answer»

2-chloro butane
2-bromo-3-butene
2-hydroxy propanal
isobutyric acid

Solution :`CH_(3)-OVERSET(CH_(3))overset("|")"CH"-COOH`
Discussion
15826.

What will be the effect of addition of organic material on water

Answer»

COD REMAIN UNAFFECTED
BOD remain unaffected
Increases BOD
Reduces BOD

Solution :When more ORGANIC MATTER are added to water, the BOD of the water will increase as the oxygen demand for DECOMPOSING the added organic matter will increase
Discussion
15827.

Write the names of the monomers of the following polymers: [--overset(O)overset(||)C-(CH_2)_5 - overset(H)overset(|)N --]_n

Answer»

SOLUTION :CAPROLACTAM
Discussion
15828.

What are anionic detergents? Give an example.

Answer»

Solution :Anionic Detergents are SODIUM salts of sulphonated long chain ALCHOLS or HYDROCARBONS
Eg : Sodium Laurylsulphate
Discussion
15829.

Write the structures of the major organic product in each of the following: CH_3underset(Br)underset(|)(CHCH_2)CH_3 + NaOH overset("water")(rarr).

Answer»

SOLUTION :`CH_3-UNDERSET(OH)underset(|)(CH)-CH_2-CH_3`
Discussion
15830.

Variable valency is a general feature of _____ elements:

Answer»

s-block
p-block
Slag formation
All

Answer :C
Discussion
15831.

What happens when a freshly precipitated Fe(OH)_(3) is shaken with a little amount of dilute solution of FeCl_(3) ?

Answer»

Solution : `Fe(OH)_(3)` is CONVERTED into COLLOIDALS state by preferential adosption of `Fe^(3+)`IONS
Discussion
15832.

Which of the following electrolytes will be most effective ion in the coagulation of gold sol

Answer»

`NaNO_3`
`K_4[FE(CN)_6]`
`Na_3PO_4`
`MgCl_2`

Solution :Gold sol = -ve sol, COAGULATION `alpha` CHARGE
Discussion
15833.

Which alkyl halide from the following pairs would you expect to react more rapidly by S_(N)2 mechanism ? Explain your answer. CH_(3)CH_(2)CH_(2)CH_(2) " or " CH_(3)CH_(2) - underset(Br)underset(|)CH - CH_(3) (ii) CH_(3)CH_(2)underset(Br)underset(|)CHCH_(3)" or " H_(3)C - underset(CH_(3))underset(|)overset(CH_(3))overset(|)C-Br (iii) CH_(3)underset(CH_(3))underset(|)CHCH_(2)CH_(2) Br " or " CH_(3)CH_(2)underset(CH_(3))underset(|)CHCH_(2)Br

Answer»

Solution :(i) `CH_(3)CH_(2)CH_(2)Br " isa " 1^(@) " ALKYL halide while " CH_(3)CH_(2) - CHBR - CH_(3) " is a " 2^(@) ` alkyl halide .
There willbe more steric hindrance in `2^(@)` alkyl halides than in `1^(@) ` alkyl halides. Therefore, `CH_(3), CH_(2)CH_(2) Br` will react faster than `CH_(3)CH_(2) - CHBr - CH_(3) " in " S_(N) 2` reaction .
(ii) `CH_(3)CH_(2) - CHBr - CH_(3) " is " 2^(@) ` alkyl halide while `(CH_(3))_(3)C - Br " is " 3^(@) ` alkyl halide . Due to lesser steric hindrance, `2^(@) ` alkyl halides react faster than `3^(@)` alkyl halides. Therefore, `CH_(3)CH_(2) - CHBr - CH_(3) ` will reacter than `(CH_(3))_(3)CBr " in " S_(N) 2` reaction .
(iii) `overset(4)CH_(3) - UNDERSET(I)underset(CH_(3))underset(|)overset(3)(CH) - overset(2)CH_(2)overset(1)CH_(2)Br "" overset(4)CH_(3)overset(3)CH_(2)- underset(II)underset(CH_(3))underset(|)overset(2)(CH) - overset(1)CH_(2)Br`
Both I and II are `1^(@) ` alkyl halides . But in alkyl halide (II) , the `CH_(3) " group at " C_(2) `is CLOSER to the Br atom while in alkyl halide (I) , the `CH_(3)" group at " C_(3)` is little away from the Br atom.
As a result , alkylhalide (II) will suffer greater steric hindrance than alkyl halide (I) . Therefore , `(CH_(3))_(2) CHCH_(2)CH_(2) Br` willreact faster than `CH_(3)CH_(2)CH(CH_(3))Br " in " S_(N)2` reaction .
Discussion
15834.

Which of the following is an example of electrophilic substitution?

Answer»

diazotisation
SANDMAYER reaction
diazo coupling
action of KCN on `ArN_(2)CL`

ANSWER :C
Discussion
15835.

Which is not an interstitial compounds ?

Answer»

TIH
`Fe_2O_3`
`Mn_2C_3`
`W_2C`

ANSWER :B
Discussion
15836.

Transition elements are d - block elements and inner transition elements are f-block elements. Name a transition metal compound and write one use of it.

Answer»

SOLUTION :`KMnO_4` It is USED as an .OXIDISING AGENT in the LABORATORY
Discussion
15837.

Which are interfering radicals:

Answer»

`PO_4^(3-)`
`C_2O_4^(2-)`
`BO_3^(3-)`
All

Answer :D
Discussion
15838.

Whichone of the followingis levorotatory ?

Answer»

`H-UNDERSET(CH_(2)OH)underset(|)overset(CHO)overset(|)(C) - OH`
`HO - underset(CH_(2)OH)underset(|)overset(CHO)overset(|)(C)-H`
`H - underset(CO OH)underset(|)overset(CH_(3))overset(|)(C)-OH`

ANSWER :B
Discussion
15839.

When HNO_3 reacts with metals, nitrogen dioxide is usually evolved if the acid is:

Answer»


ANSWER :D
Discussion
15840.

The vapour pressure of water is 12.3 kPa at 300 K. Calculate the vapour pressure of 1 molalsolution of a non-volatile solute in it

Answer»

Solution :1 MOLAL solution CONTAINS 1 mol of the SOLUTE in 1 kg of water
` therefore ` Mole fraction of solute =`(1)/(1 + (1000//18)) = (1)/(1 + 55.5)= 0.0177`
Applying Raoult.s LAW, we have
`(p^0 -p_x)/(p^0)- x_2 " or " (12.3 -p_s)/(12.3) = 0.0177`
`p_s = 12.08 kPa`
Discussion
15841.

Which of the followingis correct for N_(2) triple bond

Answer»

3s
1p,2s
2p,1s
3p

Answer :C
Discussion
15842.

Which of the following colour is imparted by alizarin dye in the presence of Cr^(3+) ion?

Answer»


Solution :ALIZARIN gives brown red with `CR^(3+)` rose red with `AL^(3+)`, BLUE with `Ba^(2+)`, violet with `Mg^(2+)` and red with `Sr&(2+)` ions.
Discussion
15843.

To neutralise completely 20 ml of 0.1 M aqueous solution of phosphorousacid (H_3PO_3), the volume of 0.1 M aqueous KOH solution required is :

Answer»

40 ml
20 ml
10 ml
60 ml

Solution :`H_3PO_3 ` is dibasic acid
`H_3PO_3 + 2KOH to K_2HPO_3 + 2H_2O`
`(M_1V_1)/(n_1)=(M_2V_2)/(n_2)`
`(0.1 xx 20)/(1) = (0.1 xx V_2)/(2)`
`V_2=(0.1 xx 20 x 2)/(0.1) = 40` ml
Discussion
15844.

What is the formula ofa compound in which the element Y form ccp lattice and atoms of X occupy (2)/(3) rd of tetrahedral voids ?

Answer»

SOLUTION :`"Number of ELEMENT"Y=n`
`"Number of element "X=2nxx(2)/(3)`
`"As number of tetrahedral void = 2n"`
`X:Y =(4n)/(3):n`
`"FORMULA "=X_(4)Y_(3)`
Discussion
15845.

Which one of the following ions exhibits d-d tranistion and paramagnetism as well ?

Answer»

`MnO_(4)^(-)`
`Cr_(2)O_(7)^(2-)`
`CrO_(4)^(2-)`
`MnO_(4)^(2-)`

Answer :D
Discussion
15846.

Whichamongthefollowing carbides on hydrolysis give alkane ?

Answer»

`Al_(4)C_(3)`
`CaC_(2)`
`BE_(2) C`
Sic

Answer :A
Discussion
15847.

What is the industrial use of acrylonitrile?

Answer»

Solution : It is USED in the MANUFACTURE of NITRILE rubbers and TEXTILES.
Discussion
15848.

What is the difference in steric number (bp + lp) of anionic and cationic part of I_(2) (s) :

Answer»

5
4
1
2

Solution :`3I_(2) (s) RARR underset(SP^(3))underset(darr)(I_(3))^(+) + underset(sp^(3)d)underset(darr)(I_(3)^(-)`
Steric no. 45
Discussion
15849.

Which of the following is the strongest acid?

Answer»

`ClO_(2)(OH)`
`ClO_(3)(OH)`
`SO(OH)_(2)`
`SO_(2)(OH)_(2).`

ANSWER :D
Discussion
15850.

Toluene, when treated with Br_2//Fe , gives p-bromotoluene as the major product, because the CH_3group

Answer»

is para DIRECTING
is meta directing.
activates the RING by hyperconjugation
deactivates the ring

Answer :A::C
Discussion