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23651.

The weakest acid among the following is -

Answer»

`CH_3COOH`
`CH_3CH_2COOH`
`(CH_3)_2CHCOOH`
`(CH_3)_3COOH`

ANSWER :D
Discussion
23652.

When SCN^(-) is oxided to an aqueous solution is

Answer»

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

Solution :`Fe^(3+) + SCN^(-) + H_(2)Orarr |Fe(H_(2)O)_(5)SCN|^(2+)` (Red colour)
i.e. `:.` HYBRIDIZATION is `sp^(3)d^(2)` outer ORBITAL (high spin octahedral.
Discussion
23653.

What is the effect of increase in pressure on the solubility of a gas in a liquid.

Answer»

SOLUTION :INCREASE in pressure increases the SOLUBILITY of a gas in a LIQUID.
Discussion
23654.

What are f-block elements ?

Answer»

Solution :The elements in which the ADDED electron enters into (n - 2)-ORBITALS or anti penultimate sub-shells are CALLED f-block elements.
Discussion
23655.

Write the mechanism of free radical polymerisation of ethene.

Answer»

SOLUTION :(i) Chain initiation STEP

`C_6overset(*)H_5 + H_2C = C_2 to C_6H_5CH_2overset(*)(CH_2)`
(II)Chain propagating step
`C_6H_5CH_2overset(*)CH_2 + H_2C = CH_2to underset(C_6H_5(-CH_2CH_2-)_nCH_2overset(*)CH_2)underset(darr)(C_6H_5CH_2CH_2overset(*)(CH_2)`
(iii) Chain terminating step
Discussion
23656.

Which of the following is a monosaccharide ?

Answer»

GLUCOSE
Fructose
Arabinose
Galactose

ANSWER :C
Discussion
23657.

Which of the following compound is more acidic ?

Answer»

`CH_(3). CH`
`CH_(3)-underset(OH)underset(|)CH.CH_(3)`
`CH_(3).CH_(2).CH_(2).OH`
`CH_(3).underset(OH)underset(|)OVERSET(CH_(3))overset(|)C-CH_(3)`

Solution :`CH_(3). CH`
Discussion
23658.

The volume strength of 1.5 N H_(2)O_(2) solution is

Answer»

3
8.4
4.8
8

Solution :VOL. STRENGTH = NORMALITY `xx5.6=1.5xx5.6=8.4`
Discussion
23659.

Which of the following sets of substance can exist as molecular crystalline solids ?

Answer»

Nickel, ZINC, Manganese
Glass, CEMENT, Rubber
Polyethene, POLYVINYL CHLORIDE, Graphite
Iodine, Sulphur, `H_(2)O`.

Answer :D
Discussion
23660.

Which of the following pairs is not correctly matched

Answer»

A HALOGEN which is LIQUID at room temperature -Bromine
The most ELECTRONEGATIVE element - FLUORINE
The most reactive halogen - Fluorine
The strongest oxidizing halogen - Iodine

Answer :D
Discussion
23661.

What is Fehling’s solution ?

Answer»

SOLUTION :Fehling.s solution is a mixture of
(i) an alkaline solution of `CuSO_4`
(ii) a solution of sodium POTASSIUM TARTRATE.
Discussion
23662.

The shapes of nitrite and nitrile respectively are:

Answer»

Lineat and ANGULAR
Angular and linear
Both angular
Both linear

Answer :B
Discussion
23663.

The role of catalyst is to change …………

Answer»

GIBBS ENERGY of reaction
Enthalpy of reaction
Equilibrium CONSTANT of the reaction
Activation energy of the reaction

Answer :D
Discussion
23664.

Which equation represents Freundlich adsorption isotherm (physical adsorption) on the basis of this theory ?

Answer»

<P>`x/m=K(P)^1//n` where x is AMOUNT of gas adsorbed on mass 'm' at pressure P
`logx/m=LOG K+1/n log P`
`x//m =KP` at low pressure and` x//m=K`at high pressure
All

Answer :D
Discussion
23665.

Which of the following will be oxidised by HIO_(4)? (A) R-underset(O)underset(||)C-underset(O)underset(||)C-R (B) R-underset(O)underset(||)C-underset(OH)underset("|")"CH"-R (C) {:(R-CH-CH_(2)-CH-R),("||"),("OHOH"):} (D) {:(R-CH-CH-R),("||"),("OHOH"):}

Answer»

1, 2 and 3
1, 3 and 4
1, 2 and 4
2, 3 and 4

Answer :C
Discussion
23666.

Write the reagents for the following conversions : "Primary alcohol" to "Benzoic acid"

Answer»

SOLUTION :
Discussion
23667.

Which one of the following is used in detection and estimation of – OH and - NH_2group inorganic compounds?

Answer»

ACETIC anhydride
Acetyl CHLORIDE
Acetamide
ETHYL acetate

Solution :Acetyl chloride
Discussion
23668.

Which of the following has higher boiling point and why? CH_(3)NH_(2) and CH_(3)OH

Answer»

Solution :`CH_(3)OH` has higher boiling POINT than `CH_(3)NH_(2)`. This is because there is strong intermolecular HYDROGEN BONDING in `CH_(3)OH`. Because of lower electronegativity of N than O, hydrogen bonding does not take place in `CH_(3)NH_(2)`.
Discussion
23669.

Which metal not react with Alcohol ?

Answer»

Na
Mg
K
NI

Solution :Ni
Discussion
23670.

The shape of [Cu(NH_(3))_(4)]^(2+) is square planar, Cu^(2+) in this complex is

Answer»

`SP^(3)` hybridised
`DSP^(2)` hybridised
`sp^(3)` of hybridised
`sp^(2)d^(2)` hybridised

ANSWER :A
Discussion
23671.

When excess ammonia is added to aqueous solution of coppersulphate ……………colour compound is formed.

Answer»

SOLUTION :DEEP BLUE
Discussion
23672.

Which process occurs in the electrolysis of aqueous solution of nickel chloride at nickel anode?

Answer»

`Ni^(2)+2e rarr Ni`
`2H^(+)+2e rarr H_(2)`
`2CL rarr Cl_(2)+2e`
`Ni rarr Ni^(2+) +2e`
Discussion
23673.

Which one of the following processes does not occur during formation of CHCl_(3) "from" Cl_(2) and NaoH ?

Answer»

HYDROLYSIS
Oxidation
REDUCTION
CHLORINATION

ANSWER :3
Discussion
23674.

Which gas is obtained by the thermal decomposition of ammonium dichromate?

Answer»

`O_2`
`NH_3`
`N_2`
NO

Answer :C
Discussion
23675.

The standard e.m.f. of a cell, involving one electron change is found to be 0.591V at 25^(@)C. The equilibrium constant of the reaction will be:

Answer»

`1.0xx10^(30)`
`1.0xx 10^(5)`
`1.0 XX 10 ^(10)`
`1.0xx 10^(1)`

Answer :C
Discussion
23676.

Which of the following is an acidic oxide ?

Answer»

`Mn_(2)O_(7)`
`Mn_(2)O_(3)`
`MnO_(2)`
MNO.

Answer :A
Discussion
23677.

Which of the followig structure is associated with the biggest jump between the second and the third ionisation energies ?

Answer»

`1s^2 , 2s^2 , 2p^6`
`1s^2 ,2s^2 , 2p^6, 3s^1`
`1s^2, 2s^2 , 2p^6,3s^2`
`1s^2 ,2s^2 ,2p^1`

ANSWER :C
Discussion
23678.

Which of the following is /are not affected by temperature ?

Answer»

Molarity
MOLALITY
Normality
Mole FRACTION

Solution :(B,d) Both molality and mole fraction are not affected by CHANGE in TEMPERATURE.
Discussion
23679.

The slope in the plot of ln[R] vs. time gives (where [R] is the final concentration of reactant.)

Answer»

`+K`
`(+k)/(2.303)`
`-k`
`(-k)/(2.303)`

ANSWER :C
Discussion
23680.

Which of the following shows optical isomerism ?

Answer»

`HO-overset("H")overset("|")underset("H")underset("|")("C")-CO_(2)H`
`H_(3)C-overset("H ")overset("| ")underset("OH ")underset("| ")("C ")-CO_(2)H`
`H_(3)C-overset(CH_(3))overset("|")underset("H")underset("|")("C ")-CO_(2)H`
`H_(3)C -overset(CH_(3))overset("|")underset("CL ")underset("| ")("C ")-CO_(2)H`

Solution :`H_(3)C-overset("H ")overset("| ")underset("OH ")underset("| ")("C ")-CO_(2)H` It possess chiral carbon, so it shows optical isomerism.
Discussion
23681.

Which of the given statement is not true for glucose ?

Answer»

The pentacetate GLUCOSE does not react with hydroxylamine to give OXIME.
Glucose reacts with hydroxylamine to form oxime.
Glucose gives Schiff's test for aldehyde.
Glucose exists in TWO CRYSTALLINE forms `alpha` and `beta`.

SOLUTION :Glucose gives Schiff.s test for aldehyde.
Discussion
23682.

Which one of the following is flourspar?

Answer»

`CaF_(2)`
`CAO`
`H_(2)F_(2)`
`CaCO_(3)`

Answer :A
Discussion
23683.

Which of the following is not a property of disaccharide ?

Answer»

Crystalline nature
WATER solubility
Sweet taste
AMIDE linkage

Solution :Amide linkage
DISACCHARIDES have GLYCOSIDIC linkage
Discussion
23684.

Which of the following is not a hydroxy acid ?

Answer»

LACTIC acid
Pyruvic acid
TARTARIC acid
Citric acid

Solution :Pyruvic acid:`CH_3- undersetoverset(||)(O)(C )-COOH`
Lactic acid:`CH_3-undersetoverset(|)(OH)(CH)-COOH`
Tartaric acid: `{:(CH(OH)COOH),(|),(CH(OH)COOH):}`
Ctiric acid:`{:(""CH_(2)-COOH),(""|),(HO-C-COOH),(""|),(""CH_(2)-COOH):}`
Discussion
23685.

Which of the following is a polynuclear compound

Answer»

`[Co(NH_3)_4Cl_2]CL`
`NaFe[FE(CN)_6]`
`[Cr(H_2O)_5Cl]Cl_2`
`[Co_2(NH_3)_6(OH)_3]Cl_3`

Answer :D
Discussion
23686.

The units of equivalent conductance , are :

Answer»

`Omegacm^(2) equ iv^(-1)`
`(Omegacm ^(2))`equiv
`(Omega^(-1) cm ^(2)) equ iv^(-1)`
`Omegacm^(2)equ iv`

Solution : Unit of EQUIVALENT conductance is`OHM^(-1)cm^(2)eq^(-1)`
Discussion
23687.

What is the shape of XeF_4molecule ?

Answer»

Solution : In `XeF_4` , Xe ATOM is in `d^2sp^3`hybridisation STATE.
` therefore XeF_4`has a square planar GEOMETRY and there are two lone PAIRS of ELECTRONS present on Xe atom.
Discussion
23688.

Which of the followinghas maximum energy ?

Answer»




SOLUTION :N/A
Discussion
23689.

The type of bonds present in ammonium chloride are :

Answer»

Only COVALENT
Only IONIC
Co-ordinate and covalent.
Ionic, co-ordinate and covalent.

ANSWER :D
Discussion
23690.

Which of the following compounds is the weakest Bronsted base ?

Answer»




Solution :Among the given COMPOUNDS, PHENOL is the strongest acid and THUS is the weakest BRONSTED base.
Discussion
23691.

Which of the following alcohols will not be easily oxidised by K_2Cr_2O_7 in dil. H_2SO_4?

Answer»

` CH_3 OH`
` CH_3 CH_2 OH`
` (CH_3)_3 COH`
` CH_3 CHOHCH_3`

ANSWER :C
Discussion
23692.

Urea on hydrolysis gives:

Answer»

acetamide
`NO_(2)`
carbonic acid
`NH_(4)OH`

Answer :C
Discussion
23693.

The zig-zag motion of colloidal particles was first observed by:

Answer»

JOHN TYNDALL
ROBERT BROWN
Zsigmondy
Ostwald.

Answer :B
Discussion
23694.

Which of the following reactions will give 2^@ chiral alcohol as one or more of major organic products ?

Answer»


`UNDERSET(("EXCESS"))(CH_3Mgl)+H-oversetoverset(O)(||)C-undersetunderset(CH_3)(|)(OCH)-C_2H_5overset(H_2O)to`

None

Solution :
Discussion
23695.

The trace metal present in insulin is

Answer»

Iron
Cobalt
Zinc
Manganese

Answer :C
Discussion
23696.

Which of the following polymers are thermoplastic ?

Answer»

TEFLON
NATURAL RUBBER
Neoprene
Polystyrene

Answer :A::D
Discussion
23697.

Which of the following ether will give two successive members of homologous series, on acid hydrolysis ?

Answer»

DIETHYL ether
Dimethyl ether
Ethyl METHYL ether
Methyl n-propyl ether

Answer :C
Discussion
23698.

Which of the following metal is a water pollutant and causes sterility in human being

Answer»

As
Mn
Mg
Hg

Answer :B
Discussion
23699.

Which of the following statements is correct regarding physical adsorption?

Answer»

It is IRREVERSIBLE,
The FORCES between adsorbate and ADSORBENT are STRONG forces
It forms multimnolecular layers
It is specific in nature.

Answer :C
Discussion
23700.

What is chelating ligand ?

Answer»

SOLUTION :A polydentate ligand which coordinates with central metal ATOM to FORM a RING compound is CALLED chelating ligand.
Example: Ethylenediamine.
Discussion