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30601.

The general formula of ether is :

Answer»

R-CHO
R-CO-R.
R-O-R.
R-COOR.

Answer :C
Discussion
30602.

The general formula of disaccharides is ……………..

Answer»

`C_(N)H_(2n-2)O_(n-1)`
`C_(n)H_(2n-4)O_(n-2)`
`C_(n)H_(2n-6)O_(n-3)`
`C_(n)H_(2n-8)O_(n-4)`

SOLUTION :`C_(n)H_(2n-2)O_(n-1)`
Discussion
30603.

The general formula of C_nH_2nO_2 could be for open chain:

Answer»

CARBOXYLIC acid
dioles
dialdehyde
diketones

Answer :C
Discussion
30604.

The general formula of carboxylic acids is

Answer»

`C_(N) H_(2n) O_(2)`
`C_(n) H_(2n + 1) O_(2)`
`C_(n) H_(2n + 2) O_(2)`
`C_(n) H_(2n - 2) O_(2)`

ANSWER :A
Discussion
30605.

The general formula of carbohydrates is:

Answer»

`C_nH_(2N+1)O`
`C_nH_2nO`
`C_n(H_2O)_n` or `C_x(H_2O)_y`
`C_n(H_2O)_2n`

ANSWER :C
Discussion
30606.

The general formula of carbohydrates is _______.

Answer»

`C_(n)(H_2O)`
`C_(n)(H_2O)_(n)`
`C(H_(2)O)_(n)`
`H(CO_(2))`

SOLUTION :`C_(n)(H_(2)O)_(n)`
Discussion
30607.

The general formula of carbohydrate is

Answer»

`C_(N)H_(2n+1)O`
`C_(n)H_(2n)O`
`C_(n)(H_(2)O)_(n)`
`C_(n)(H_(2)O)_(2n)`

Solution :The GENERAL FORMULA of CARBOHYDRATES is `C_(n)(H_(2)O)_(n)`, where n is an integer.
Discussion
30608.

The general formula of an ester, where R represents an alkyl group , is

Answer»

ROH
RCOOH
RCOOR
ROR

Answer :C
Discussion
30609.

The general formula of amines is

Answer»

`C_(N)H_(2N+1)N`
`C_(n)H_(2n+2)N`
`C_(n)H_(2n+3)N`
`C_(n)H_(2n)N`

ANSWER :C
Discussion
30610.

The general formula of alkyl halides is

Answer»

`C_n H_(2N ) X `
`C_n H_(2n+1) X`
`C_nH_(2n)X_2`
`C_nH_(2n+1)X`

ANSWER :B
Discussion
30611.

The general formula of aliphatic ethersis same as that of ___________.

Answer»

MONOHYDRIC ALCOHOLS
dihydric alcohols
trihydricalcohols
polyhydricalcohols

ANSWER :A
Discussion
30612.

The general formula of a cycloalkane is

Answer»

`C_(N)H_(n)`
`C_(n)H_(2n)`
`C_(n)H_(2n-2)`
`C_(n)H_(2n+2)`

Solution :GENERAL formula for CYCLOALKANE `rightarrow C_(n)H_(2n)` as `-(CH_(2))-` is the repeated unit.Therefore general formula `-(CH_(2))_(n)- = C_(n)H_(2n)`
Discussion
30613.

The general formula for saturated monocarboxylic acid is :

Answer»

`C_n H_n COOH`
`C_n H_(2N-1) COOH`
`C_n H_(2n-2) COOH`
`C_n H_(2n) O_2`

ANSWER :D
Discussion
30614.

The general formula for aliphatic ether is ________.

Answer»

`C_(N) H_(2N+2)O`
`C_(n)H_(2n)O`
`C_(n)H_(2n-2)O`
`C_(2n) H_(2n+1)O`

ANSWER :D
Discussion
30615.

C_(n)H_(2n)O_(2) isthe general formulaof

Answer»

CARBOXYLIC acids
diols
dialdehydes
diketones.

Answer :C
Discussion
30616.

The general electrophilic substitution reaction (replacement of H. by an electrophilic which is an electron deficient species) in aromatic ring is represented as followed. An electrophilic attacks on ortho and para positions which respect to a stronger +m group are present in benzene ring and the electrophilie attacks at meta position with respect to stronger -m group if two -m groups are present in benzene ring. The product of the following reaction is

Answer»




SOLUTION :
Discussion
30617.

The general electrophilic substitution reaction (replacement of H. by an electrophilic which is an electron deficient species) in aromatic ring is represented as followed. An electrophilic attacks on ortho and para positions which respect to a stronger +m group are present in benzene ring and the electrophilie attacks at meta position with respect to stronger -m group if two -m groups are present in benzene ring. What will be the product when electrophile Br^(o+) attacks on

Answer»




SOLUTION :Because -m of `-NO_2 GT -C=N`
`-NO_2` will DECIDE .
Discussion
30618.

The general electrophilic substitution reaction (replacement of H. by an electrophilic which is an electron deficient species) in aromatic ring is represented as followed. An electrophilic attacks on ortho and para positions which respect to a stronger +m group are present in benzene ring and the electrophilie attacks at meta position with respect to stronger -m group if two -m groups are present in benzene ring. If electrophilic Br^(o+) attacks on the product will be :

Answer»




SOLUTION :SINCE + m:- `OCH_3 GT -NHCOCH_3` so `-OCH_3` will DECIDE
Discussion
30619.

Thegeneral fomula of quaternaryammouimcompound is

Answer»

`R - NH_(2)`
`R_(3)N`
`R_(4)N^(+),X^(-)`
`NH_(4)X`

Answer :C
Discussion
30620.

The general electronic configuration of inner transition elements is "…....................".

Answer»

SOLUTION :`(n-2)F^(1-14)(n-1)d^(0-1) NS^(2)`
Discussion
30621.

Thegeneralelectronicconfigurationof 4f - seriesof elementscan bewriteenas "_____"

Answer»

`[Xe] 4s^(2-14) 5D^(0-4)6S^(2)`
`[Xe] 4f^(2-14)5d^(0-4)6s^(1)`
`[Xe] 4f^(1-14)5d^(0)6s^(1)`
`[Xe ] 4f^(2-14) 5d^(0-4)6s^(1)`

Answer :A
Discussion
30622.

The general electronic configuration of transition elements is

Answer»

`(n-1)d^(1-5)`
`(n-1)d^(1-10) NS^1`
`(n-1)d^(1-10) ns^(0-2)`
None

Answer :C
Discussion
30623.

The general configuration of transition element is

Answer»

`(n-1)d^(1-5)`
`(n-1)d^(1-10)ns^(1)`
`(n-1)d^(1-10)ns^(1-2)`
`ns^(2)(n-1)d^(10)`

ANSWER :C
Discussion
30624.

The gel-sol transformation on mechanical shaking and allowing to stand is called……….

Answer»

SOLUTION :THIXOTROPY.
Discussion
30625.

The gastric juice in our stomach contains enough HCl to make the hydrogen ion concentration about 0.10 mole litre. The pH of gastric juice is

Answer»

0.01
1
2
14

Solution :The CONCENTRATION of `[H^(+)] = 10^(-2)` mole/litre
`PH = -LOG[H^(+)] = -log [10^(-2)] , pH = 2`.
Discussion
30626.

The gas(es) which turn lime water milky is (are)

Answer»

`CO_(2)`
`SO_(2)`
`NO_(2)`
NO

Solution :`Co_(2)+Ca(OH)_(2) to UNDERSET("White ppt)")(CaCO_(3) DARR +H_(2)O), So_(2)+Ca(OH)_(2) tounderset("White ppt)")(CaCO_(3) darr +H_(2)O)`
Discussion
30627.

The gases which are responsible for photochimical smog are :

Answer»

OXIDES of nitrogen
Hydrocarbons
Carbon monoxide
All of these

Answer :D
Discussion
30628.

The gases which are responsible for acid rain :

Answer»

OXIDES of nitrogen
Oxides of sulphur
Hydrocarbons
Carbon moroxide

Answer :A::B
Discussion
30629.

The gases which are absorbs of IR-radiation:

Answer»

Oxygen
Nitrogen
Carbon dioxide
Chloroflurocarbons

Answer :C::D
Discussion
30630.

The gases respectively absorbed by alkaline pyrogallol and carbon tetrachloride are

Answer»

`O_3, CH_4`
`O_2,O_3`
`SO_2,CH_4`
`N_2O_4,O_3`

SOLUTION :ALKALINE PYROGALLOL & `CCl_4` ABSORBS `O_2, O_3.`
Discussion
30631.

The gases showing heating and cooling effect during Joule-Thomson's experiment have Joule-Thomson coeffieient:

Answer»

+ve and -ve respectively
-ve and +ve respectively
+ve
-ve

Answer :B
Discussion
30632.

The gases produced in the reaction, Pb(NO_(3))_(2) overset(Delta)rarr and NH_(4)NO_(3) overset(Delta)rarr are respectively

Answer»

`N_(2)O, NO`
`N_(2)O, NO_(2)`
`NO, NO_(2)`
`NO_(2), N_(2)O`

SOLUTION :`{:(2PB(NO_(3))_(2)overset(DELTA)rarr 2PbO + 4 NO_(2) + O_(2)),(" "NH_(4)NO_(3)overset(Delta)rarr N_(2)O + 2H_(2)O):}`
Discussion
30633.

The gases liberated during the electrolysis of aqueous solution of hydrogen fluoride

Answer»

`H_(2)andO_(2)`
`H_(2)and F_(2)`
`O_(2)andF_(2)`
Can nor be electrolysed

Answer :A
Discussion
30634.

The gases evolved at anode during Kolbe synthesis are

Answer»

`CO_(2)`
Hydrocarbons
Both (a) and (B)
None of these

Answer :C
Discussion
30635.

The gases are at absolute temperature 300K and 350 K respetivily. The ratio of average kinetic energy of their molecules is :

Answer»

7:6
6:7
36:49
49:36

Answer :B
Discussion
30636.

The gases absorbed by alkaline pyrogallol and turpentine oil respectively are

Answer»

`O_3,CH_4`
`O_2,O_3`
`SO_2,CH_4`
`N_2O,O_3`

ANSWER :B
Discussion
30637.

The gases absorbed by alkaline pyragallol and oil of cinnamon respectively are:

Answer»

`O_3 , CH_4`
`O_2 , O_3`
SO, `CH_4`
`N_2O, O_3`

ANSWER :B
Discussion
30638.

Thegaseousreactions A_(2) to 2Ais firstorderin A_(2)After12.3minutes65%of A_(2)remainsundecomposed, Howlongwillit take to decompose90%of A_(2)? Whatis thehalf- lifeof thereactions

Answer»

SOLUTION :(i) Timerequiredfor 90%reaction=65.8 MIN
(II) Half-lifeperiod`= t_(1//2) = 19.8`min
Discussion
30639.

The gaseous reaction A+BhArr2C+D,+Q is most favoured at

Answer»

LOW TEMPERATURE and high pressure
High temperature and high pressure
High temperature and low pressure
Low temperature and low pressure

SOLUTION :Low TEMPERATUE and low pressure.
Discussion
30640.

The gaseous reaction A+BhArr 2C+D,+Q is most favoured at

Answer»

low TEMPERATURE and HIGH pressure
high temperature and high pressure
high temperature and low pressure
low temperature and low pressure

Solution :`A+BhArrC+D+Q`
Reaction is exothermic THUS low temperature is favoured.
Pressure should also be low. Hence for given reaction low temperature and low pressure is most favoured.
Discussion
30641.

The gaseous mixture present in the 'Sun' atmosphere

Answer»

`AR, KR, XE`
`NE, Kr`
`Kr, Xe`
`He, H_2`

ANSWER :D
Discussion
30642.

The gaseous mixture used by divers for respiration is:

Answer»

`N_2 + O_2` MIXTURE
`He+O_2` mixture
`Ar+O_2` mixture
Neon + `O_2` mixture

Answer :B
Discussion
30643.

The gaseous mixture containing 2 moles of each of two ideal gases A(C_(V),m=(3)/(2)R) and B(C_(V),m=(5)/(2)R). Find out the average molar heat capacity at constant volume.

Answer»

8R
3R
2R
R

Solution :AVERAGE `C_(V),m=(n_(1)C_(V_(1))m_(1)+n_(2)C_(V_(1))m_(2))/(n_(1)+n_(2))`
`=(2xx(3)/(2)R+2xx(5)/(2)R)/(2+2)=2R`
Discussion
30644.

The gaseous decomposition reaction, A(g) rarr 2B(g) + C(g) is observed to be first order over the excess of liquid water at 25^(@)C. If is found that after 10 minutes the total pressure of system is 188 torr. The rate costant of the reaction (in hr^(-1)) is : [Given : vapour pressure of H_(2)O at 25^(@) is 28 torr ("ln" 2=0.7,"ln"3=1.1,"ln"10=2.3)]

Answer»

`0.02`
`1.2`
`0.2`
NONE of these

Answer :B
Discussion
30645.

The gaseous decomposition reaction, A(g)rarr2B(g)+C(g) is observed to first order over the excess of liquid water at 25^(@)C. It is found that after 10 minutes the total pressure of system is 188 torr and after very long time it is 388 torr. The rate constant of the reaction (in hr^(-1)) is : [Given : vapour pressure of H_(2)O at 25^(@) is 28 torr (ln2=0.7, ln3=1.1, ln10=2.3)]

Answer»

`0.02`
`1.2`
`0.2`
NONE of these

Answer :B
Discussion
30646.

Thegaseousenvelopearoundthe arthisknownas atmosphere. Thelowestlayerof thisis extended upto 10 kmfrom level. Thislayer is ____

Answer»

Stratosphere
TROPOSHERE
MESOSPHERE
Hydrosphere

ANSWER :B
Discussion
30647.

The gas will be

Answer»

`CO_(2)`
`SO_(2)`
`H_(2)S`
`SO_(3)`

ANSWER :B,C
Discussion
30648.

The gas with lowest boiling point is:

Answer»

Hydrogen
Helium
Nitrogen
Argon

SOLUTION :
He has low boiling POINT DUE to weak INTERMOLECULAR attractive force.
Discussion
30649.

The gas which will be most easily liquefied is

Answer»

`He`
`O_2`
`NH_3`
`CO_2`

ANSWER :D
Discussion
30650.

The gas which turns mercurousnitrate paperblack is

Answer»

`NH_(3)`
`CI_(3)`
`SO_(2)`
`SO_(3)`

ANSWER :a
Discussion