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17201.

Which reagent can be used to distinguish O_(3)and H_2O_2 ?

Answer»

`H_(2)S`
`KMnO_(4)`
PbS
Nal

Solution :`G_(2)O_(2)`reduces `KMnO_4`
`H_2O_2` ACTS as both oxidizing and reducing agent while `O_(3)`acts only as oxidizing agent.
Discussion
17202.

Which one of the following compounds show optical activity

Answer»




ANSWER :B
Discussion
17203.

There is no effect of temparature on the mole fraction of a solution .

Answer»
Discussion
17204.

Which one of the following sets of vitamins is fat soluble?

Answer»

`C,D,B_6,B_(12)`
`A,B,E,K`
`A,D,B_1,B_2`
`D,B_1,B_2,E`

ANSWER :B
Discussion
17205.

When H_(2) reacts with Na, it acts as

Answer»

OXIDISING agent
Peducing agent
Both
None

Answer :A
Discussion
17206.

Which of the following has highest octane number?

Answer»

2,2,4-Trimethylpentane
2,2,3-Trimethylpentane
Neopentane
Isohexane.

Solution :N/A
Discussion
17207.

Which of the following is also known as ''Fools gold''

Answer»

Wurtzite
IRON PYRITES
Chalcosite
Silver glance

Solution :Iron pyrites `(FeS_(2))` is also CALLED 'fools GOLD'.
Discussion
17208.

Which among the followingis NOT CORRECT order of boiling point ?

Answer»

Ethyl ALCOHOL ` gt` ethylamine ` gt` ETHANE
Ethyl alcohol ` gt` ethylamine ` gt` dimethylamine
n-Propylamine ` LT ` n-butylamine ` gt ` ethylamine
n-Propylamine ` lt ` ETHYLMETHYLAMINE ` lt ` trimethylamine

Answer :D
Discussion
17209.

Which of the following is called mixed anhydride ?

Answer»

`NO_(2)`
`N_(2) O_(3)`
`N_(2) O_(5)`
All of these

Answer :A
Discussion
17210.

Vitamin B_12 is a complex compound of ____

Answer»


ANSWER :1
Discussion
17211.

Which is correct oxidation state of lead

Answer»

`+2`,+4
`+1`,+2
`+3`,+4
`+4`

ANSWER :A
Discussion
17212.

Which of the following is isoelectronic pair ?

Answer»

`ICl_(2), ClO_(2)`
`BrO_(2)^(-), BrF_(2)^(+)`
`ClO_(2), BrF`
`CN^(-), O_(3)`

SOLUTION :Both `BrO_(2)^(-) (35 + 2 xx 8 + 1 = 52) and BrF_(2)^(+) (35 + 2 xx 9 - 1 = 52)` have 52 electrons.
Discussion
17213.

Which of the following parameters of a chemical readtion are increased when a catalyst is used?

Answer»

RATE & ACTIVATION energy
Rate CONSTANT & enthalpy
Enthalpy & TIME duration
Rate & Rate constant

Answer :D
Discussion
17214.

Vitamin D is called

Answer»

ASCORBIC acid
Calciferol or ergocalciferol
Thiamine
Riboflavin 

ANSWER :B
Discussion
17215.

The volume of 10 N and 4 N HCl required to make 1 L of 7 N HCl are

Answer»

0.50 L of 10 N HCl and 0.50 L of 4 N HCI
0.60 L of 10 N HCl and 0.40 L of 4 N HCI
0.80 L of 10 N HCl and 0.20 L of 4 N HCI
0.75 L of 10 N HCl and 0.25 L of 4 N HCI.

Solution :Let volume of 10N HCl to be mixed with 4N = HCl = x
volume of 4N required = 1 - x
`N_1V_1 + N_2V_2 = N_3V_3`
`10 xx x +4 xx (1 - x) = 7 xx 1`
` 10 x + 4 - 4X = 7`
`6x = 3`
` x = 3//6 = 0.5 L`
volume of 10N HCl required = 0.5 L
volume of 4N HCl required = 1 - 0.5 = 0.5L
Discussion
17216.

What is correct about P_(10).

Answer»

It can not GIVE Bromine WATER test
It can not DECOLOURIZE Bayer's reagent
It will give same product with HBR in PRESENCE or absence of Peroxides
It absence of peroxides

Solution :
Discussion
17217.

Who proposed the concept, that solute particles in solution behaves like gaseous molecules

Answer»

Boyle
van't Hoff
Nollet
Charles

SOLUTION :FOLLOW van't Hoff THEORY for DILUTE solution.
Discussion
17218.

White phosphorus molecule (P_(4)) doesn't have

Answer»

Six P-P SINGLE BONDS
Four P-P single bonds only
Four LONE pairs of electrons.
PPP angle of `60^(@)`

Answer :2
Discussion
17219.

Which of the statements regarding formation of compound A is correct ?

Answer»

EPOXIDE ring opening is by TRIMOLECULAR reaction
A has a chiral carbon
a gives positive test with neutral FERRIC chloride
A declourises dichromate solution in acidic medium

Answer :D
Discussion
17220.

Which of the following is not considered to be apollutant?

Answer»

`NO_2`
`CO_2`
`O_3`
`C_x H_y`

SOLUTION :`CO_2`
Discussion
17221.

What are the common types of defects in solids ?

Answer»

SOLUTION :Solids are not PERFECT in structure. There are different types of imperfections or defects in them. POINT defects ANDLINE defects are COMMON types of defects.
Discussion
17222.

The water is electrolysed in a cell, hydrogen is liberated at one electrode and oxygen is simultaneously liberated at the other. In a particular experiment hydrogen and oxygen so produced were collected together and the total volume measured 16.8 mL at NTP. How many coulombs were passed through the cell in the experiment ?

Answer»

SOLUTION :96.5 COULOMBS
Discussion
17223.

Which of the following can be obtained from napth?

Answer»

Parffin wax
Napthalene
PETROLEUM ether
All

Solution :N/A
Discussion
17224.

Which one of the following complex ions has geometrical isomers ?

Answer»

`[Co(en)_(3)]^(3+)`
`Ni(NH_(3))_(5)Br]^(+)`
`[Co(NH_(3))_(2)(en)_(2)]^(3+)`
`[Cr(NH_(3))_(4)(en)]^(3+)`

Solution :Geometrical isomerism is SHOWN by disubstituted OCTAHEDRAL COMPLEXES such as `[Co(NH_(3))_(2)(en)_(2)]^(3+)`
Discussion
17225.

Which defines the standard reduction electrode potential of Zn^(2+) ions?

Answer»

`Zn_((aq))^(2+) + 2e RARR Zn_((s)) , [Zn^(2+)]=1M`
`Zn_((G)) rarr Zn^((2+))+2e, [Zn^(2+)]=1M`
`Zn_((aq))^(2+) rarr Zn_((s)) + 2e, [Zn^(2+)]=1M`
`Zn_((g))^(2+) rarr Zn_((s)) - 2e, [Zn^(2+)]=1M`
Discussion
17226.

Which of the following has high vapour pressure at temperature below its melting point?

Answer»

Citric ACID
BENZOIC acid
Salicylic acid
All

Answer :B
Discussion
17227.

What will happen during the electrolysis of aqueous solution of CuSO_4 in the presence of Cu electrodes ?

Answer»

COPPER will deposit at CATHODE.
Copper will dissolve at anode.
Oxygen will be RELEASED at anode.
Copper will deposit at anode.

Answer :A::B
Discussion
17228.

Whichofthe followingin unstable

Answer»

`C_(6)H_(5) -N_(2)Br`
`C_(6)H_(5)-N_(2)I`
`CH_(3)-N_(2)CL`
`C_(6)H_(5)-N_(2)Cl`

Answer :C
Discussion
17229.

When dilute ferrous (Fe^(2+)) salt solution is added to an aqeous solution containing nitrate (NO_(3)^(-)) ion followed by the addition of conc. H_(2)SO_(4) forms a brown colored ring. What is te chemical composition of the complex that is responsible for this brown colored ring.

Answer»

`Fe(NO_(3))_(2)`
`[Fe(H_(2)O)_(5)(NO)]^(2+)`
`[Fe(H_(2)O)_(5)(NO_(3))]^(+)`
`[Fe(H_(2)O)_(4)(NO)(NO_(3))]^(+)`

ANSWER :2
Discussion
17230.

Which of the following crystals has unit cell such that a ne b ne c and alpha ne beta ne gamma ne 90^@ ?

Answer»

`K_2Cr_2O_7`
`NaNO_3`
`KNO_3`
`K_2SO_4`

Solution :`K_2Cr_2O_7` CRYSTAL has unit CELL a `a NE b ne c` and `ALPHA ne beta ne gammane 90^@`
Discussion
17231.

You are given 10^(-5)MNaCl solution and 10^(-8)MAgNO_(3) solution.They are mixed in 1:1 volume ratio predict whether AgCl will be precipitated or not ,if solubility product (Ksp) of AgCl=10^(-10)

Answer»

SOLUTION :Upon mixing equal volumes ,volume of solution will get doubled.so CONCENTREATION of each ion will get HALVED from original VALUE.
ionic product `K_(lp)=[Ag^(+)][Cl^(-)]_("upon mixing")=(10^(-5))/(2)xx(10^(-5))/(2)=25xx10^(-15)( ltK_(sp))`
Hence ,no precipitaion will take place.
Discussion
17232.

Which of the following compounds will behave as a reducing sugar in an aqueous KOH solution?

Answer»




SOLUTION :
Discussion
17233.

Whichone of thefollowingcompoundsis mostreactiveforS_N 2Arreaction

Answer»




ANSWER :C
Discussion
17234.

What may be expected to happen when phosphine gas is mixed with chlorine gas?

Answer»

The mixure only COOLS down
`PCl_(3)` and `HCl` are formed and the mixure warms up
`PCl_(5)` and `HCl` are formed and the mixure cools down
`PH_(3).Cl_(2)` is formed with WARMING up

Solution :`PH_(3)+4Cl_(2)rarrPCl_(5)+3HCl`
Discussion
17235.

Which of the following order is wrong ?

Answer»

`H_2OgtH_2SgtH_2SegtH_2Te` (Thermal STABILITY)
`H_2SltH_2SeltH_2TeltH_2O` (BOILING points)
`H_2OltH_2SltH_2SeltH_2Te` (PKA value)
`O-HgtS-HgtSe-HgtTe-H` (Bond Energy)

Answer :C
Discussion
17236.

The synthetic steroid ethynylestradiol (1) is a compound used in the birth control pill. A. How many sp^(3) hybridised carbon atoms are present in compound (1) ? (a) 8(b) 9(c ) 10 (d) 11(e ) 12 B. Hiow many sp^(2) hybridised carbon atoms are present in compound (1) ? (a) 4 (b) 5 (c ) 6 (d) 7(e ) 8 C. How many sp hybridised carbon atoms are present in compound (1) ? (a) 2(b) 4 (c ) 6 (d) 8 (e ) 10 D. Which of the following functional group is contained in compound (1) ? (a) A ketone(b) An alcohol(c ) A carboxylic acid(d) An ester E. How many asymmetric (stereogenic) centres are present in compound (1) ? (a) 2(b) 3 (c ) 4 (d) 5

Answer»


SOLUTION :N//A
Discussion
17237.

The relation between osmotic pressure, concentration and temperature of a solution is given by:

Answer»

`PI = CRT`
`1/pi = CRT`
`pi= (CR)/(T)`
`pi = (RT)/(C )`

SOLUTION :`pi = CRT`
Discussion
17238.

The rms velocity of CO gas molecules at 27^(@)C is approximately 1000 m/s. For N_(2) molecules at 600 K the rms velocity is approximately

Answer»

2000 m/s
1414 m/s
1000 m/s
1500 m/s

Solution :`C=SQRT((3RT)/M)`
`(C_(CO))/(C_(N_(2)))=sqrt((3RT_(CO))/(M_(CO))xx(M_(N_(2)))/(3RTN_(2)))`
`1000/(C_(N_(2)))=sqrt(300/28xx28/600)impliesC_(N_(2))=1000xxsqrt(2)`
`C_(N_(2))=1000xx1.414=1414m//s`
Discussion
17239.

Which of the following complexes are tetrahedral but spin free ?

Answer»

`[NiCl_(4)]^(2-)`
`[Ni(CO)_(4)]`
`[Ni(CN)_(4)]^(2-)`
Both (a) and (b)

Solution :`"SPIN FREE" to "High spin"`
Discussion
17240.

Which pair (s) has some bond angle ? (a)BF_(3),BCl_(3) (b) PO_(4)^(-3),SO_(4)^(-2) ( c) BF_(3),PF_(3) (d) NO_(2)^(+),N_(2)O (e) N_(3)^(-),NO_(2) correct option are -

Answer»

a,B,d
b,d
b,C,d
a,d,e

Answer :A
Discussion
17241.

What are micelles ? Give an example of a micelles system.

Answer»

SOLUTION :The aggregate of colloidal particle which have both hydrophobic and hydrophilic parts are CALLED micelles. These are formed above a particular temperature called Kraft.s temperature `(T_k)` and above certain concentrations. called Critcal Micelles Concentration (CMC).
These molecules are arranged radially with the HYDROCARBON or non-polar part towards the centre and the polar part towards the PERIPHERY, e.i., soap solution in WATER is an example of micelles system.
Discussion
17242.

The stabilization of the dispersed phase in a lyophobic sol is due to:

Answer»

The VISCOSITY of the medium
The surface tension of the medium
Liking for the medium
The formation of an electrical layer between the two phases

SOLUTION :Due to preferential adsorption of SIMILAR IONS, an electrical double layer formed on the surface of colloidal particles e.g.,arsenious SULPHIDE solution.
Discussion
17243.

Which of the following is the weakest Bronsted base ?

Answer»




`CH_3NH_2`

Solution :`C_6 H_5 NH_2` is the weakest BASE. It is DUE to the delocalization of a lone PAIR of electrons prsent on N-atom into the BENZENE ring.
Discussion
17244.

Which would not give a precipitate with dilute AgNO_3 solution ?

Answer»

`HNO_3`
NACL
`Na_2CO_3`
HCl

Answer :A
Discussion
17245.

Thermodynamically graphite is more stable than diamond but diamond does not transform into graphite on its own. Why?

Answer»

SOLUTION :This conversion is not favoured by KINETIC FACTORS (the activation ENERGY for this is very HIGH).
Discussion
17246.

You are given 6 identical balls . The maximum number of square voids and triangular voids (in separate arrangements ) that can be created respectively are

Answer»

`2, 4`
`4, 2`
`4, 3`
`3, 4`

ANSWER :A
Discussion
17247.

Which among the following reaction involves nucleophilic addition followed by elimination of water ?

Answer»

`CH_3COCH_3+HCN OVERSET(""^(-)OH)(to)`
`CH_3COCH_3+NH_2NH_2 overset(H^+)(to)`
`CH_3COOH + NH_3 to`
All of these

Solution :`UNDERSET("acid-base REACTION")(CH_3-COOH+NH_3) to CH_3COONH_4`
Discussion
17248.

Which of the following compounds when heated with CO at 150^@C and 500 atm pressurein presence of BF_3 formsethyl propionate ?

Answer»

`C_2H_5OH`
`CH_3OCH_3`
`C_2H_5OC_2H_5`
`CH_2OC_2H_5`

Solution :Reaction of diethyl ETHER `(C_2H_5-O-C_2H_5)` with carbon MONOXIDE produces ETHYL PROPIONATE.
`C_2H_5-O-C_2H_5+CO underset"500 atm"OVERSET(BF_3,150^@C)to underset"ethyl propionate"(C_2H_5COOC_2H_5)`
Discussion
17249.

Thermosetting polymer , bukelite is formed by the reaction of phenol with:

Answer»

`CH_3CHO`
HCHO
HCOOH
`CH_3CH_2CHO`

ANSWER :B
Discussion
17250.

Which of the following is the strongest conjugate base

Answer»

`Cl^(-)`
`CH_(3)COO^(-)`
`SO_(4)^(-)`
`NO_(2)^(-)`

Solution :Because it is CONJUGATE BASE of weak acid.
`CH_(3)COOH HARR CH_(3)COO^(-) + H^(+)`.
Discussion