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9501.

The unit of rate constant and that of rate of reaction are same for

Answer»

first ORDER
zero order
second order
all are wrong

SOLUTION :For zero order REACTION , `(DX')/(dt) = K`
Discussion
9502.

Which of the following will favour the formation of NH_3 by Haber's process ?

Answer»

increase of TEMPERATURE
increases of pressure
ADDITION of catalyst
addition of a promoter

Solution :`N_2 +3H_2 HARR 2NH-3` + HEAT. This reaction is favoured by decreases of temperature, increases of pressure, addition of catalyst and addition of promoter.
Discussion
9503.

Which of the following is least reactive towards S_(N)2reaction ?

Answer»

`CH_(3)X`
PRIMARY halide
Secondary halide
TERTIARY halide

ANSWER :d
Discussion
9504.

The transition metals and their compounds are known for their_______________ activity.

Answer»

SOLUTION :CATALYTIC
Discussion
9505.

What is the b.p of an aquoues solution whose freezing point is -2.48^(@)C ?(K_(f)=1.86^(@)C kg// mol, K_(b)=0.512^(@)C.kg//mol)

Answer»

`100.7^(@)C`
`102.5^(@)C`
`109.0^(@)C`
`99.3^(@)C`

Solution :`(DELTA T_(F))/(Delta T_(B))=(K_(f))/(K_(b))`
Discussion
9506.

Visha plotted a graph between concentration of R and time for a reaction R to P. On the basis of this graph, answer the following question : (i) Predict the order of reaction. (ii) What does the slope of the line indicate ? (iii) What are the units of rate constant ? ""["Give ":log 2=0.3010,log3=0.4771,log4=0.6021]

Answer»

Solution :(i) Order of the REACTION =0
(II) SLOPE of the line `=-k`
(III) Units of rate constant `"= mol L"^(-1)" s"^(-1)`
Discussion
9507.

Froth flotation process used for the concentration of sulphide ore.

Answer»

SOLUTION :For the benefaction (or concentration) of SULPHIDE ORE, froth floatation process is GENERALLY used.
Discussion
9508.

Write the name of last transition element of 3d series.

Answer»

Solution :Zinc `(._(30)ZN)` is the last ELEMENT of 3d SERIES.
Discussion
9509.

Which reaction is used for thepreparation of alpha-Bromoacetic acid ?

Answer»

Kolbe reaction<BR>Reimer-tiemann reaction
HELL Volhard Zelinsky reaction
Perkin reaction

Solution :When `Cl_(2)` or `Br_(2)` is REACT with carboxylic acid is replaced by `Cl_(2)` or `Br_(2)`.
`underset("Acetic acid")(CH_(3)COOH) overset(Br_(2))to underset(alpha-"Bromoacetic acid")(CH_(2)BrCOOH)`
this reaction is known as Hell Volhard Zelinsky reaction.
Discussion
9510.

Which one of the following is wrong about molecularity of a reaction ?

Answer»

It may be WHOLE number or fractional
It is calculated from reaction mechanism
It is the number of molecules of the REACTANTS taking part in a SINGLE step chemical reactions.
It is always equal to the order FO elementary reaction

Answer :A
Discussion
9511.

Which one of the following radiosotopes is used in the treatment of blood cancer?

Answer»

`P^(32)`
`Co^(62)`
`I^(131)`
`NA^(24)`

Solution :`P^(32)` is USED for treatment of BLOOD cancer i.e., leukemia.
Discussion
9512.

Wrtie the IUPAC names of the following : (i) CH_(3) underset(OC_(2)H_(5)) underset(|)(CHCH_(2))CH_(3) "" (ii) CH_(5)-O-C(CH_(2))_(3) "" (iii) C_(6)H_(5)OCH_(2)CH_(3) (iv) (CH_(3))_(2)CHOCH_(2) "" (vi) CH_(3)OCH_(3)CH_(2)OC_(1)H_(6) "" (vi) (##MOD_SPJ_CHE_XII_P2_C11_E01_024_Q01.png" width="80%">

Answer»

Solution :(i) 2-Ethoxybutane (ii) 2-Methoxy-2-methylpropane (III) ETHOXY BENZENE
(iv) 2-Methoxypropane (V) 1-Ethoxy-2-methoxyethane (vi) (Bromoethoxy) benzene
Discussion
9513.

Which of the following is incorrect for oxygen

Answer»

`KMnO_(4)` (s) on STRONG heating gives oxygen gas
Oxygen mixed with HELIUM is used for artificial respiration
It has two UNPAIRED electrons in bonding `PI` molecular orbitals
HgO on heating gives Hg and `O_(2)`

Answer :C
Discussion
9514.

Which one of the following reactions can be used for the preparation of beta - hydroxy acid

Answer»

PERKIN reaction
Reformatsky reaction
ALDOL CONDENSATION
Claisen condensation

Answer :B
Discussion
9515.

Which of the following forms cationic micelles above certain concentration?

Answer»

SODIUM dodecyl SULPHATE
Sodium ACETATE
urea
Cetyltrimethylammoniumbromide

Solution :Cetyltrimethylammonium CATIONS aggregate to form cationic micelles.
Discussion
9516.

Which one of the following ores is best concentrated bu froth floatation method /

Answer»

Malachite
Magnetic
Siderite
Galena

Answer :D
Discussion
9517.

What does not change on changing temperature

Answer»

MOLE fraction
Normality
Molality
NONE of these

Answer :A::C
Discussion
9518.

Which of the following compounds has the lowest dipole moment?

Answer»


`CH_3C = CCH_3`
`CH_3CH_2 =CCH`
`CH_2 =CH-C = CH `

ANSWER :B
Discussion
9519.

The reagent thatdistinguishes between silver and lead salt is

Answer»

`H_(2)S` gas
dil. HCI solution after this dissolved in HOT water
`NH_(4)CI("SOLID") + NH_(4)OH("solution")`
`NH_(4)CI("solid") + NH_(4))_(2)CO_(3)` solution

Solution :`PbCI_(2)`is insoluble in cold water butsoluble in hot water whereas `AGCI` is insoluble in both states
Discussion
9520.

Which of the following has/have potential energy diagram for conformations closely resembling to ethane.(i) 2, 2-Dimethylpropane(II) 2, 3-Dimethylbutane (III) 2,2,3-Trimethylbutane(IV) 2,2-Dimethylbutane

Answer»

I, III, IV
I, II, IV
I, II, III
II, III, IV

Solution :All have the P.E. DIAGRAM like
Discussion
9521.

Which among the following statements are correct with respect to adsorption of gases on a solid

Answer»

The extent of adsorption is equal to `k p^(2n)` ACCORDING to Freundlich isotherm. 
The extent of adsorption is equal to `k p^(1//n)` according to Freundlich isotherm. 
The extent of adsorption is equal to `(1 + bp)/(AP)` according to langmuir isotherm 
Freundlich adsorption isotherm FAILS at low pressure 

Solution :Freundlich adsorption Isotherm `x/m = K.P^(1/n)`, langmuir adsorption Isotherm `= x/m = (ap)/(1 + bp)`
Discussion
9522.

Which of the following statement are true-

Answer»

physisorption is UNIVERSAL in nature and it involves formation of multimolecular LAYER on the surface of adsorbent
rate of a chemisorption increases with RISE in temperature
there are some cases, where molecules of solvent instead OS solute molecules , GET adsorbed on the surface of the adsorbent
surface free energy increases due to adsorption

Answer :A::C
Discussion
9523.

What is the coordination number of Pt in [Pt(NO_(2))(H_(2)O)(NH_(3))_(2)]Br ?

Answer»

`3`
`4`
`2`
`5`

Answer :B::D
Discussion
9524.

The threshold wavelength for photoelectric effect on sodium is 5000 overset@A. Its work function is:

Answer»

`4XX10^(-19)` J
1 J
`2xx10^(-19)J`
`3xx10^(-10) J`

Answer :A
Discussion
9525.

When EDTA solution is added to Mg^(2+) ion solution, then which of the following statements is not true ?

Answer»

Four coordinate SITES of `Mg^(2+)` are occupied by EDTA and remaining two sites are occupied by water molecules
All six coordinate sites of `Mg^(2+)` are occupied
PH of the SOLUTION is decreased
Colourless `[Mg-EDTA]^(2-)` chelate is formed

Solution :`Mg^(2+)` forms an OCTAHEDRAL complex with EDTA where all six coordinate sites of `Mg^(2+)` are occupied.
Discussion
9526.

What volume at NTP of gaseous ammonia will be required to be passed into 30 cm^(3) of 1 N H_(2)SO_(4) solution to bring down the acid strength of the latter of 0.2 N ?

Answer»


ANSWER :537. 6 ML
Discussion
9527.

Write the molecular formula and structural formula of BHA and BHT. What are thermoplastic polymers ? Write a note on aldol condensation.

Answer»

Solution :The MOLECULAR formula and structure of BHA and BHT are as follows :
BHT i.e., Butylated Hydroxy Toluene

Formula : `((CH_(3))_(3)C)_(2)CH_(3)C_(6)H_(2)OH(C_(15)H_(24)O)`
BHA i.e., Butylated Hydroxy Anisole.

Formula : `(CH_(3))_(3)C-C_(6)H_(3)-(OCH_(3))(OH)(C_(11)H_(16)O_(2))`
Thermoplastic polymers : A thermoplastic (also called thermosoftening plastic) is a polymer which becomes pliable or moldable above a specific temperature and returns to a solid state upon cooling.
Most thermoplastic polymers have a high molecular weight and polymer chains associate through intermolecular forces.
The physical properties of a thermoplastic polymer change drastically without an ASSOCIATED PHASE change below its melting point and above its GLASS transition temperature. Example : PMMA i.e., poly methyl methacrylate, Nylon etc.
Discussion
9528.

What is the minimum pH when Fe(OH)_(3) starts precipitating from a solution containing 0.1 M FeCl_(2)? (K_(sp) of Fe(OH)_(3)=8xx10^(-13) M^(3))

Answer»

3.7
5.7
10.3
8.3

Answer :C
Discussion
9529.

Which of the following pairs is an extensive property ?

Answer»

MASS, temperature
Enthalpy, SURFACE tension
Viscocity, work
Volume, entropy

Answer :D
Discussion
9530.

Which of the following statements is correct for spontaneous adsorption of a gas ?

Answer»

`DELTAS` is NEGATIVE and therefore, `DeltaH` should be HIGHLY positive
`DeltaS` is negative and therefore, `DeltaH` should be highly negative
`DeltaS` is positive and therefore, `DeltaH` should be negative
`DeltaS` is positive and therefore, `DeltaH` should ALSO be highly positive

Answer :B
Discussion
9531.

The transition element having highest oxidation state belongs to which group?

Answer»

VIII
`VII_B`
`V_B`
`IV_B`

ANSWER :A
Discussion
9532.

Which of the following is a secondary pollutant?

Answer»

NO
CO
`SO_2`
PAN

Answer :D
Discussion
9533.

What are copolymers ? Give example .

Answer»

Solution :Copolymers : A polymer which is formed by the POLYMERISATION of two (or) more chemically different TYPES of monomer UNITS is called copolymer. E.g. :BUTADIENE -Styrene polymer (Buna -S)
Discussion
9534.

Which of the following is not an example of Wurtz-Fittig reaction?

Answer»

`C_(6)H_(5)CH_(2)Cl+CH_(3)Cl overset("Na/ether")to`
`C_(6)H_(5)CH_(2)Cl+C_(6)H_(5)Cl overset("Na/ether")to`
`C_(6)H_(5)Cl+CH_(3)Cl overset("Na/ether")to`
NONE of the above

Answer :A
Discussion
9535.

Which equation of Langmuir adsorption isotherm will apply at high pressure ?

Answer»

<P>`(X)/(m)=a,p`
`(x)/(m)=(B)/(a)`
`(x)/(m)=(1)/(a.p)`
`(x)/(m)=(a)/(b)`

ANSWER :D
Discussion
9536.

Which of the following reduces fever ?

Answer»

ANALGESIC
ANTISEPTIC
ANTIBIOTIC
Antipyretic

Answer :D
Discussion
9537.

White (yellow) phosphorous glows in the dark due to oxidation which is called, …………… .

Answer»

PHOSPHORESCENCE PHOSPHORUS
phosphorus
Fluorescence
Liminoscence

Solution :phosphorescence phosphorus
Discussion
9538.

What is the effect of presence of Schottky defect on the density of a crystal ?

Answer»

SOLUTION : DENSITY DECREASES,
Discussion
9539.

Which of the following has amide linkage ?

Answer»

NYLON - 66
Terylene
Teflon
Bakelite

ANSWER :A
Discussion
9540.

When 3.06 g of solid NH_4HSis introduced into a two-litre evacuated flask at 27^@C, 30% of the solid decomposes into gaseous NH_3and H_2S(i) Calculate K, and K, for the reaction at 27^@C . (ii) What would happen to the equilibrium when more solid NH_4 HSis introduced into the flask?

Answer»

SOLUTION :`(i) 8.1 XX 10^(-5) ` mole/L , `0.049 atm^(-2)`, (ii) no EFFECT
Discussion
9541.

Thermosetting polymer Bakelite is prepared by the reaction between phenol and …………………..

Answer»

`CH_(2)CHO`
`HCHO`
`HCOOH`
`CH_(3)CH_(2)CHO`

SOLUTION :HCHO
Discussion
9542.

What is the van't Hoff factor for a compound which undergoes tetramerisation in an organic solvent?

Answer»

SOLUTION :`4A rarr A_(4)`
1 MOLE of A after association gives `(1)/(4)` mole of `A_(4)`. HENCE, `i=(1)/(4)=0.25`.
Discussion
9543.

What is the fole of activated chrocoal in gas mask used in coal mines ?

Answer»

Solution :Activated CHRCOAL ADSORBS the the POISONOUS gases usually PRESENT in coal mines.
Discussion
9544.

Which one of the following is an exact example of article radioactive?

Answer»

`._(11)^(23)Na + ._(0)^(1)n to ._(11)^(24)Na + gamma`
`._(11)^(24)Na + ._(1)^(1)H to ._(12)^(24)Mg + ._(0)^(1)n`
`._(2)^(4)He + ._(7)^(14)N to ._(8)^(17)O + ._(1)^(1)H`
`._(8)^(17)O + ._(0)^(1)n to ._(7)^(18)O + ._(1)^(1)H`
`._(2)^(4)HE + ._(13)^(27)Al to ._(15)^(30)P + ._(0)^(1)n`
`._(15)^(30)P to ._(14)^(30)Si + ._(-1)^(0)E`
`._(238)^(89)Ac to ._(90)^(224)Th + beta`
`._(90)^(228)Th to ._(88)^(224)Ra + alpha`

Answer :c
Discussion
9545.

Which of the following transition metal oxide is not an insulator ?

Answer»

MnO
NiO
VO
`Mn_(2)O_(3)`

ANSWER :C
Discussion
9546.

Which one of the following structures represents nylon 6,6 polymer?

Answer»




SOLUTION :
Discussion
9547.

Total number of steriosomers possible for 2,3-dichlorobutanal is

Answer»


Solution :`CH_3 - underset(CI) underset(|) OVERSET("*")CH - underset(CI) underset(|) overset("*")CH -overset(O ) overset(||)C-H(d,L),(d,d)(l,l),(l,d),` 4 Stereisomers
Discussion
9548.

Write IUPAC name : ""(##U_LIK_SP_CHE_XII_C13_E08_056_Q01.png" width="80%">

Answer»


ANSWER :4-Nitro-N, N-Dimethylbenzenamine.
Discussion
9549.

Which has greater molarity in water, AgCl or Mg(OH)_2 ? Can the relative solubilities be predicted on the basis of the values of K_(sp) alone?

Answer»

SOLUTION :`MG(OH)_2, No`
Discussion
9550.

The second dissociation constant of fumaric acid is greater than maletic acid. Explain.

Answer»


ANSWER :After the FIRST DISSOCIATION,, maleate ion is more stablised DUE to intramolecular H-bonding, WHEREAS furnate ion does not have intramolecular H-bonding.
Discussion