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21501.

Which is true regarding nitrogen?

Answer»

Less electronegative
Has lowionisation ENTHALPY
d - orbitals are available
Ability to form p pi - p pi bonds with itself

Solution :Because of its SMALL size , NITROGEN has a strong tendency to form `ppi-ppi` bonds . It has high electronegative and does not have any d- orbital Also . It has high ionisation enthalphy DUE to its stable half - filled electronic configuration.
Discussion
21502.

Which of the following compounds exhibits optical isomerism

Answer»

`CH_(3)CH_(2)COOH`
`CH_(3)CHOHCOOH`
`CH_(3)CH_(2)CH_(2)OH`
`CH_(3)CHOHCH_(3)`

Solution :`{:(""H),("|"),(CH_(3)-C^(**)-COOH^(**)),("|"),(""OH):}` chiral centre is present.
Discussion
21503.

Which is non -polar ,but contains polar bonds ?

Answer»

HCL
`H_2O`
`SO_3`
`CO_2`

ANSWER :D
Discussion
21504.

Three dimensional molecules with cross links are formed in the case of a

Answer»

thermoplastic
thermosetting plastic
both (a) and (b)
NONE of the above

Solution :Thermosetting plastics consist of chain molecules which are chemically bonded, or cross-linked, with each other when HEATED. When thermosetting plastics crosslink, the molecules create a permanent, 3-D network that can be CONSIDERED ONE giant molecule.
Discussion
21505.

Which of the following has highest coagulating power for As_(2)S_(3) sol ?

Answer»

`SO_(4)^(2-)`
`AI^(3+)`
`PO_(4)^(3-)`
`K^(+)`

ANSWER :B
Discussion
21506.

What happens to molar conductivity when one mole of KCI dissolved in one litre is diluted to five litres?

Answer»

SOLUTION :INCREASES.
Discussion
21507.

Which reaction is used to convert alcohol to ketone/ aldehyde in the presence of DMSO?

Answer»

LUCAS TEST
Swern OXIDATION
BIOLOGICAL oxidation
KOLBE's reaction

Solution :Swern oxidation
Discussion
21508.

The unit of equilibrium constant K, N_2 + 3H_2 rarr 2NH_3 will be:

Answer»

`LIT^2 MOLE^(-2)`
`mole^2 lit^(-2)
mole/lit
it has no unit

Answer :A
Discussion
21509.

The reagents (s) for the following conversion .

Answer»

alcoholic `KOH`
alcoholic `KOH` followed by `NaNH_(2)`
aqueous `KOH` followed by `NaNH_(2)` .
`Zn//CH_(3)OH`

Solution :`BrCH_(2)-CH_(2)-CH_(2)Br overset(Alc.KOH)RARR CH_(2)=CHBR overset(NaNH_(2))rarr CH-=CH`
Elimination of `HBr` from `CH_(2) -CHBr` requires a stronger base because here Br acquires partial double bond CHARACTER due to resonance .
Discussion
21510.

Write the name or formula of the following: A dihydric alcohol

Answer»

SOLUTION :`OH-CH_2-CH_2-OH`: Ethane-1,2-diol
Discussion
21511.

Write the equation involved in the manufacture of nitric acid by Ostwalds process by maintaining reaction conditions.

Answer»

SOLUTION :REFER PAGE No. 114, Q.No.20.
Discussion
21512.

The starting substance for the preparation of iodoform is any one of the following, except

Answer»

`CH_(3)CH(OH)CH__(3)`
`CH_(2)CH_(2)OH`
`HCH_(2)OH`
`CH_(3)COCH_(2)`

Solution :`CH_(3)OH` does not UNDERGO iodoform REACTION, all OTHERS do so.
Discussion
21513.

Which of the following amine is optically active?1

Answer»

`CH_(3)NH_(2)`
`CH_(3)NHC_(2)H_(5)`

sec-Butylamine

Answer :D
Discussion
21514.

Van't Hoff's factor for 0.01M aqueous solution acetic acid is 1.04, the pH of that solution is

Answer»

3.4
6.4
9.6
10.6

Answer :A
Discussion
21515.

Which kind of isomerism is shown by the complex [Co(NH_(3))_(5)(ONO)]SO_(4)? 1. Ionization isomerism 2. Linkage isomerism 3. Geometrical isomerism 4. Optical isomerism

Answer»

1, 2, 3, & 4 are CORRECT
1, 3, & 4 are correct only
1 & 2 are correct only
2, 3 & 4 are correct only

Answer :C
Discussion
21516.

Which of the following statement is INCORRECT with respect to metallic or electronic cinductivity ?

Answer»

Metallic CONDUCTIVITY depends on the STRUCTURE of metal and its characteristics.
Metallic conductivity depends on the number of electrons in the valence SHELL ofatom of metal.
The electrical conductivity of metal INCREASES with increase in temperature.
There is no change in the structure of metal during electrical conduction.

Answer :C
Discussion
21517.

Which of the following is 3- oxo cyclohex - 4- ene -1- carboxylic acid

Answer»




ANSWER :B
Discussion
21518.

The site of oxidation in an electrochemical cell is:-

Answer»

The anode
The cathode
The electrode
Reference electrode

Answer :A
Discussion
21519.

Which of the following oxides of chromium is amphoteric in nature

Answer»

`CRO`
`Cr_2O_3`
`CrO_3`
`CrO_5`

ANSWER :B
Discussion
21520.

Write the reactions of Williamson's synthesis of 2-exthoxy-3-methylpentane starting from ethanol and 3-methylpentan-2-ol.

Answer»

Solution :`CH_3 CH_2 OH + HBR overset(Delta)to CH_3CH_2 Br + H_2 O `
`CH_3 CH_2 underset(CH_3)underset(|)CH- underset(CH_3)underset(|)CH-OH + Na to CH_3 CH_2 - underset(CH_3)underset(|)CH-underset(CH_3)underset(|)CH-O^(-) Na^+ + H_2 `
`CH_3 CH_2 underset(CH_3)underset(|)CH-underset(CH_3)underset(|)OH - O^(-) Na^+ + CH_3 CH_2 Br overset(S_N^2)to underset("2-Ethoxy-3-methylpentane")(CH_3CH_2-underset(CH_3)underset(|)CH-underset(CH_3)underset(|)CH-OCH_2 CH_2 + NABR)`
Discussion
21521.

Which structure represents the peptide bond ?

Answer»

`-OVERSET(H)overset(|)N-UNDERSET(O)underset(||)C-underset(H)underset(|)N-overset(|)underset(|)C-NH-overset(O)overset(||)C-NH-`
`-overset(H)overset(|)N-underset(O)underset(||)C-overset(|)underset(|)C-overset(|)underset(|)C-overset(|)underset(|)C-overset(H)overset(|)N-overset(|)underset(|)C-overset(O)overset(||)underset(|)C-`
`-overset(H)overset(|)N-overset(|)underset(|)C-underset(O)underset(||)C-overset(H)overset(|)N-overset(|)underset(|)C-overset(O)overset(||)C-`
`-overset(H)overset(|)N-overset(|)underset(|)C-overset(O)overset(||)underset(|)C-overset(O)overset(||)C-underset(H)underset(|)N-overset(|)underset(|)C-overset(|)underset(|)C-overset(H)overset(|)N-underset(O)underset(||)C-overset(|)underset(|)C-overset(|)underset(|)C-C-`

ANSWER :C
Discussion
21522.

Two vessel A and B in volume ratio 2: 1 maintained at temperature 300 K and 600 K contain equalmass of CH_(4) and O_(2) respectively. The ratio of toal translational kinetic energy of gas in flask A to that of flask B is -

Answer»

1
2
4
0.25

Solution :`(KE_(A))/(KE_(B)) = ((3)/(2) xx n_(CH_(4)) RT_(A))/((3)/(2) xx n_(O_(2))RT_(B))`
`((w)/(16) xx 300)/((w)/(32) xx 600) = (1)/(1)`
Discussion
21523.

Which of the following is an ore of gold ?

Answer»

Sylvanite
ANGLESITE
SYLVINE
NONE of these

ANSWER :A
Discussion
21524.

Which of the following compounds is metallic and ferromagnetic ?

Answer»

`MnO_(2)`
`TiO_(2)`
`CrO_(2)`
`VO_(2)`

Answer :C
Discussion
21525.

Which one of the following structure represents the peptide chain :

Answer»




SOLUTION :N//A
Discussion
21526.

The reverse of esterification is known as:

Answer»

Acidolysis
Trans-Esterification
Hydrolysis
Neutralisation

Answer :C
Discussion
21527.

Ultraviolet radiation from sun causes a reaction that produces:

Answer»

fluorides
carbon monoxide
sulphur dioxide
ozone

Answer :D
Discussion
21528.

The vapour pressure of 0.01m solution of a weak base BOH in water at 20^(@)C is 17.536mm. Calculate K_(b) for the base. Aq.tension at 20^(@)C=17.54mm

Answer»

<P>

Solution :`i=("OBS.lowering in v.p.")/("cal.lowering in v.p.")=(p-p_(obs.))/(p^(0).(N)/(N))=(17.540-17.536)/(17.54xx(0.01)/(1000.18))`
Then apply`i=1+x` and `K_(b)=(0.01x^(2))/(1-x)`
Discussion
21529.

The strongest P-O bond is found in the molecule

Answer»

`F_(3)PO`
`Cl_(3)PO`
`Br_(3)PO`
`(CH_(3))_(3)PO`

Answer :A
Discussion
21530.

Which of the following is less basic than methylamine ?

Answer»

DIMETHYLAMINE
BENZYLAMINE
Ethylamine
Trimethylamine

Answer :B
Discussion
21531.

Write Fischer projection formula for D-(-) erythrose.

Answer»

SOLUTION :
Discussion
21532.

Thermodynamic feasibility of a reaction alone cannot decide the rate of the reaction. Explain with the help of an example.

Answer»

Solution :For a REACTION to take place, appropriate activation MUST be supplied to the reactant. If this is not available, the reaction does not take place. For example thermodynamically, conversion of diamond to graphitc is possible, but it REQUIRES an activation energywhich is not available at ROOM temperature. Hence the reaction does not take place.
Discussion
21533.

What is neoprene ? Give its one use.

Answer»

SOLUTION :It is a SYNTHETIC RUBBER and its MONOMER is CHLOROPRENE.
Discussion
21534.

Write the formula for sulphanilic acid and mention any one of its uses.

Answer»

SOLUTION :
It is USED in the MANUFACTURE of DYES and DRUGS.
Discussion
21535.

Which of the following organic compounds has same hybridization as its combustion product -(CO_2)

Answer»

Ethene
Ethanol
Ethane
Ethyne

Solution :`{:("PRODUCT","REACTANT"),(O=C=O,H-underset"SP"C-=underset"sp"C-H):}`
Discussion
21536.

Which one of the following compounds does not react with RMgh to form RH? (1). (CH_3)_(2)NH (2). CH_(3)CH_(2)OH (3). H_(2)O (4). (CH_3)_(3)N (5).CH_(3)C-=CH.

Answer»

SOLUTION :`(CH_3)_(3)N`.
Discussion
21537.

What mass of propene is obtained from 34.0 g of 1- iodopropane on treating with ethanolic KOH , if yield is 36% ?

Answer»

Solution :`underset("MOL. mass = 170 ") (CH_(3)CH_(2)CH_(2)I ) + KOH ("ethanolic") to underset("Mol. mass = 42 ") (CH_(3)CH = CH_(2) + KI + H_(2)O)`
170 g of 1-iodoform yield = 42 g of propene
34 g of 1-iodoform yield = `42/170 xx 34 `
If the yield is `36%` AMOUNT of propene = `42/170 xx 34 xx 36/100 g = 3.024 g`
Discussion
21538.

Which of the following has highest tendency to ionise in aqueous solution.

Answer»

`HCOOH`
`CH_3COOH`
`FCH_2COOH`
`BrCH_2COOH`

ANSWER :C
Discussion
21539.

What is the product whenP_4O_10 is dissolves in water ?

Answer»

PHOSPHOROUS acid
Orthophosphoric acid
Phosphoric acid
None of these

Answer :B
Discussion
21540.

What is the correct formula of sodium stearate ?

Answer»

`C_(15)H_(35)COONa`
`C_(17)H_(35)COONa`
`C_(27)H_(35)COONa`
`C_(17)H_(35)COOK`

Solution :`C_(17)H_(35)COONa`
Discussion
21541.

Write the IUPAC names of the HOOC-CH_2_COOH compound.

Answer»


ANSWER :`HOOC-CH_2_COOH` : PROPANE 1, 2 dioicacid (or propanedioic ACID)
Discussion
21542.

Which of the following enchances lathering property of soap ?

Answer»

SODIUM carbonate
Sodium rosinate
Sodium stearate
Trisodium phosphate.

Solution :Sodium rosinate ENHANCES the LEATHERING PROPERTY of SOAP.
Discussion
21543.

Whatismeantbythetermchromotography ?

Answer»

SOLUTION :Thetermchromotrography wasoriginally DERIVED from theGreekwordchromameaningcolour andgraphymeaningwritingbecausethemethodwasfirstusedfor theseparationofcolouredsubstances(plant pigments ) intoindividualcomponents. Nowthe TERM chromatographyhaslostitsoriginal meaningandthemethod iswidelyusedforseparation, purification, IDENTIFICATION andcharacterizationofthecomponentsofa mixturewhethercolouredorcolourless.
Discussion
21544.

Which one of the following processes is used for the manufacture of calcium?

Answer»

Reduction of CaO with carbon
Reduction of CaO with hydrogen
Electrolysis of a mixture of ANHYDROUS `CaCl_(2)andKCl`
Electrolysis of molten `Ca(OH)_(2)`

Answer :C
Discussion
21545.

Which of the following compound is decomposed by the action of HNO_2

Answer»

`CH_3NH_2`
`NH_2 oversetoversetO(||)C NH_2`
`CH_3 oversetoverset(O)(||)CNH_2`
All of these

SOLUTION :`CH_3NH_2 OVERSET(HNO_2)to CH_3OH + N_2 + H_2O`
Discussion
21546.

What is sacrificial protection from rusting ? Which metal is generally used for this purpose ?

Answer»

SOLUTION :In SACRIFICIAL protection, rusting of iron is protected by covering it with a layer of a metal more active than iron. The more active metal loses electrons in PREFERENCE to iron and is consumed in due COURSE of time. Zinc is commonly used for covering iron surfaces. The process of covering iron with zinc is called galvanization.
Discussion
21547.

Which of the following molecule in its valence shell has three bond pairs of electrons and one lone pair of electron

Answer»

`NH_(3)`
`H_(2)O`
`BF_3`
`CO_(2)`

SOLUTION :`underset((NH_(3)))({:(""ddotN),("/|\"),("HHH"):}) "" underset((H_(2)O))({:(""ddot(O)),(" /\"),("HH"):}) "" underset((BF_(3)))({:("B"),(" / |\"),("FFF"):})underset((CO_(2)))(O=C=O)`
Discussion
21548.

Which of the following is/are present in RNA?

Answer»

ADENINE
GUANINE
Cytosine
Thymine

Solution :N//A
Discussion
21549.

Which of the following gas is adsorbed most by activated charocal?

Answer»

`CO_2`
`N_2`
`CH_4`
Ar

Answer :C
Discussion
21550.

The two complexes, given below are:

Answer»

GEOMETRICAL isomers
Position isomers
Optical isomers
Identical

Answer :D
Discussion