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4601.

The unit of ebullioscopic constant is …………….. .

Answer»

`K kg MOL^(-1) or K (molality)^(-1)`
`mol kg K^(-1) or K^(-1) (molality)`
`kg mol^(-1)K^(-1)or K^(-1) (molality)^(-1)`
`Kg mol^(-1)K^(-1)or K^(-1)(molality)^(-1)`

ANSWER :A
Discussion
4602.

Which among the following is the major product (p) of the given reaction

Answer»




ANSWER :C
Discussion
4603.

Which of the following compound is an antioxidant?

Answer»

BHA
DDB
ABS
CFRP

Solution :Butylated HYDROXY ANISOLE (BHA) is an ANTIOXIDANT.
Discussion
4604.

Which of the following compounds are resolvable into d or 1-forms ?

Answer»

`[ZnCl_(2)(EN)]`
`[Be(acac)_(2)`
`[Co(GLY)_(3)]`
`[Cr(C_(2)O_(4))_(3)]^(3-)`

ANSWER :C::D
Discussion
4605.

What is the [Mg^(2+)] in 0.10 M NaF that is saturated with MgF_(2) at 25^(@) C ?

Answer»

0.050 M
`1.9xx10^(-3)` M
`1.2xx10^(-3)` M
`6.4xx10^(-7)` M

Answer :d
Discussion
4606.

Which of the following reactions will not occur spontaneously?

Answer»

`F_(2)+2Cl^(-)rarr 2F^(-)+Cl_(2)`
`I_(2)+2Br^(-)rarr 2I^(-)+Br_(2)`
`Br_(2)+2I^(-)rarr 2Br^(-)+I_(2)`
`2I^(-)+Cl_(2)^(-) rarr 2Cl^(-)+I_(2)`

Answer :B
Discussion
4607.

Which transition metal is used for the reduction of steam to hydrogen ?

Answer»

Mg
Fe
Se
pt

Answer :B
Discussion
4608.

Which one is an example of gel?

Answer»

SOAP
CHEESE
milk
fog

Solution : cheese
Discussion
4609.

What is the monomer of nylon-2-nylone-6?

Answer»

Glycine and amino caproic ACID
Amino caproic acid and ADIPIC acid
3-Hydroxybutanoic acid and glycine
Ethylene GLYCOL and adipic acid

Solution :NYLON -2-nylon-6 is a co-polymer of glycine `(H_2N- CH_2-COOH)` and amino caproic acid`(H_2N(CH_2)_5- COOH)`.
Discussion
4610.

Which of the following has most negative electron gain enthalpy?

Answer»

OXYGEN
Chlorine
Nitrogen
Fluorine

Answer :B
Discussion
4611.

The structure of the product(Z) in the reactions given below HC-=CH underset(H^+)overset(NaNH_2.CH_3COCH_3)to X underset(H_2O)overset(Hg^(2+), H_3O^(+)) toZ is

Answer»

`CH_3-CH_2-CH_2-oversetoverset(O)(||)C-CH_2OH`
`CH_3-undersetunderset(O)(||)C-oversetoverset(CH_3)|CH-CH_2OH`
`CH_3-undersetunderset(O)(||)C-undersetunderset(OH)(|)oversetoverset(CH_3)(|)C-CH_3`
`CH_3-CHOH-oversetoverset(CH_3)|CH-CHO`

ANSWER :C
Discussion
4612.

Write the final products in the following: (i) (iii) CH_2=CH-CH_2-CN to_((b)H_3O^(+))^((a)DIBAL-H) (b) Arrange the following in the increasing order of their reactivity towards nucleophilic additon reaction: (c ) Draw the structure of 2,4-DNP derivative of acetaldehyde.

Answer»

Solution :(i) `CH_3CH_2CH_3` Propane
(ii)
(III) `CH_2=CH-CH_2-CHO`
But 3-enal
(B) 2,N-DNP DERIVATIVE of ACETALDEHYDE
Discussion
4613.

What is/are the factor(s) that govern the single electrode potential of a half cell?

Answer»

CONCENTRATION of IONS in solution
tendency to FORM ions
temperature
all of these

Answer :D
Discussion
4614.

The set representing the correct order of first ionization potential is

Answer»

K gt Na gt Li
Be gt Mg gt CA
B gt C gt N
Ge gt Si gt C

SOLUTION :Within a GROUP `IE_1` decreases from top to BOTTOM.
Discussion
4615.

What is meant by avitaminosis?

Answer»

SOLUTION :Vitamins are essential in human diet. They are not USED in cell building, but can catalyse biological processes. Their DEFICIENCY cause diseases, KNOWN as avitaminosis.
Discussion
4616.

What weight of zinc will react dil. Sulphuric acid to liberate 1000mL of hydrogen 27^(@)C and 750mm pressure?

Answer»


ANSWER :2.245g of ZINC
Discussion
4617.

What is the difference between elastomers and fibres? Give one example of each.

Answer»

SOLUTION :
Discussion
4618.

Vapour pressure of water at 293 K is 17.51 mm. Lowering of vapour pressure of a sugar solution is 0.0614 mm. Calculate (i) Relative lowering of vapour pressure (ii) Vapour pressure of the solution and (iii) Mole fraction of water .

Answer»

<P>

Solution :Here, we are GIVEN that Vapour pressure of water `(p^(@))=17.51mm`
Lowering of vapour pressure `(p^(@)-p_(S))=0.0614mm`
(i)`"Relative lowering of vapour pressure "=(p^(@)-p_(s))/(p^(@))=("0.0614 mm")/("17.51 mm")="0.00351"`
(ii) Vapour pressure of the solution `(p_(s))`
`p^(@)-p_(s)="0.0614 mm,"p^(@)="17.51 m"`
`THEREFORE"17.51mm "-p_(s)="0.0614 mmor"p_(s)="17.51 mm "-0.0614 mm = 17.4468 mm"`
(III) To calculate mole fraction of water :
By Raoult's law `(p^(@)-p_(s))/(p^(@))=(n_(2))/(n_(1)+n_(2))=x_(2),` mole fraction of solution, i.e., `x_(2)=(p^(@)-p_(s))/(p^(@))=0.00351`
`therefore"Mole fraction of solvent (water )," x_(1)=1-x_(2)=1-0.00351=0.99649`
Discussion
4619.

The weight in grams of O_2 formed at Pt anode during the electrolys of aq. K_2 SO_4 solution during the passage of one coulomb of electricity is

Answer»

`(16)/(96800)`
`(8)/(96500)`
`(32)/(96500)`
`(64)/(96500)`

Answer :B
Discussion
4620.

Which of the following compounds is the most stable

Answer»




SOLUTION :A CONJUGATED DIENE is the most STABLE
Discussion
4621.

Which of the following complex follow Sidgwick rule of EAN ? (Pt-78, Ag-47, Fe-26, V-23)

Answer»

`[V(CO)_(6)]`
`K_(3)[Fe(CN)_(6)]`
`[Ag(CN)_(2)]^(-)`
`[Pt(en)_(2)Cl_(2)]^(2+)`

Solution :(d) `[Pt(en)_(2)Cl_(2)]^(2+)implies 78-4+6xx2=86`
Discussion
4622.

What is the use of ranitidine?

Answer»

Solution :Ranitidine is an ANTACID. It prevents the interaction of histamine with the RECEPTORS PRESENT in the stomach As a RESULT, LESS hydrochloric acid is released and hence the cause of hyperacidity is controlled/cured
Discussion
4623.

What is an activated complex?

Answer»

Solution :It is an UNSTABLE complex which is formed at the energy BARRIER by the mutual COMBINATIONS of the reacting SPECIES. The energy state representing the activated complex is known as transition state.
Discussion
4624.

Which of the following is(are) correct for real gases?

Answer»

`underset(p rarr 0)(Lt) (pV_(m))=` constant at constant high temperature
`underset(V_(m)rarr 0)(Lt) (pV_(m))`= constant at constant low temperature
`underset(p rarr 0)(Lt) ((pV_(m))/(RT))` = 1 at high temperature
`underset(V rarr 0)(Lt) ((pV_(m))/(RT)) = R`

Solution : A GAS behaves IDEALLY when `P rarr 0`and temperature is high
`PV_(m)=` constant for ideal gas`(PV_(m))/(RT)`=1for ideal gas
Discussion
4625.

Which of the following do not contain ester linkage

Answer»

lecithin
oils
fats
cholesterol

Answer :D
Discussion
4626.

Which of the following is not an antihistamine ?

Answer»

Chloropheniramine
Dimetap
SECONAL
Equanil

SOLUTION :seconol is BARBITURATE , equanil is ANTI hypertensive
Discussion
4627.

What will be the osmotic pressure of the solution prepared by dissolving 1.75 gram sucrose in 50 mL. solution at 17^(@)C temperature ?

Answer»

`0.406`
`8.12`
`0.822`
`0.0406`

Solution :`T=17^(@)C=293K, w=1.75 G, V=0.15 L`
`PI = (WRT)/(MV)=(1.75xx0.08314xx293)/(342xx0.15)=0.822` bar.
Discussion
4628.

Which compound in each of the following pairs will react faster in S_(N)2reaction with- OHand why? (i) CH_(3)Br " or " CH_(3)I "" (ii) (CH_(3))_(3)C Cl " or " CH_(3)Cl

Answer»

Solution :(i) `CH_(3)Br " and " CH_(3)I `are both PRIMARY halogen compounds. The REACTIVITY will depend on the SIZE of the halogen. Iodine is a better leaving group because of LARGE size. Therefore `CH_(3)I`will REACT faster than `CH_(3)Br` .
(ii) Out of `(CH_(3))_(3) C Cl " and " CH_(3)Cl `, the latter will react faster with ` - OH" in " S_(N) 2` reaction . This is because `1^(@) ` halides react faster than `3^(@) ` halides in `S_(N)2` reaction .
Discussion
4629.

When chloroform is exposed to air, the compound formed is :

Answer»

PHOSGENE
Chloral
Acetyl CHLORIDE
all of these

Answer :A
Discussion
4630.

Which ore of copper is iron free?

Answer»

Copper pyrites 
Copper GLANS 
CUPRITE 
MALACHITE 

Answer :A
Discussion
4631.

Which of the following is most effective in coagulat ing a ferric hydroxide sol?

Answer»

KCL
`KNO_3`
`K_2SO_4`
`K_3[FE(CN)_6]`

ANSWER :D
Discussion
4632.

Uranium isotopes are usually serparated by using compounds of the halogen

Answer»

`F_2`
`Cl_2`
`Br_2`
`I_2`

ANSWER :A
Discussion
4633.

Write two main functions of carbohydrate in plants.

Answer»

Solution :(i) Structural material for plant cell walls. The polysaccharide cellulose acts as the chief structure material of the plant cells walls.
(ii) RESERVE food material: The polysaccharide starch is the major reserve food material in the plans. It is stored in seeds and acts as the reserve food material for the TINY plant TILL it is CAPABLE of making its own food by photosynthesis.
Discussion
4634.

What is the slag formed from P_2O_5 impurity in metallurgy of iron?

Answer»

`Ca_3(PO_4)_2`
`CaSiO_3`
`Fe_3(PO_4)_2`
`FeSiO_3`

ANSWER :A
Discussion
4635.

What is IUPAC name of Na[Al(OH)_4] ?

Answer»

Sodium aluminium HYDROXIDE. 
Sodium tetra hydro ALUMINATE (III) 
Sodium tetra hydro aluminate (II) 
Sodium aluminate. 

Answer :B
Discussion
4636.

What is thermite process ? Give one reaction ?

Answer»

Solution :It is the process of reduction of a metal oxide to the metal with the help of ALUMINIUM powder as a REDUCING agent
e.g.`Cr_2O_3 + 2AL to Al_2O_3 + 2Cr`
Discussion
4637.

Which of the following molecules have zero dipole moment? (I) gauche conformation of 1, 2 - dibromoethane. (II) anti conformation of 1, 2 - dibromoethane. (III) trans - 1, 4 - dibromocyclohexane (IV) cis - 1, 4 - dibromocylohexane (V) tetrabromomethane. (VI) 1, 1- dibromocyclohexane

Answer»

I and II
II, III and V
II and V
I, IV and VI

Answer :B
Discussion
4638.

Which of the following statement(s) is/are correct regarding chemicalequilibrium? (i) Equilibrium is maintained rapidly. (ii) The concentration of reactants and products become same at equilibrium. (iii) The concentration of reactants and products are constant but different. (iv) Both forward and backward reactions occur at all times with same speed.

Answer»

(i) and (III)
(i), (II) and (iii)
(iii) and (IV)
(i), (iii) and (iv)

ANSWER :C
Discussion
4639.

Which metal sulphide is soluble in excess NH_(3) solution?

Answer»

ZnS
MNS
FES
`Cr_(2)S_(3)`

Solution :ZnS, MnS, FeS do not dissolve in EXCESS `NH_3` solution DUE to their low `K_(sp)` values.
`Cr_(2)S_(3)+6NH_(3) hArr [Cr(NH_(3))_(6)]^(3+)+S^(2-)(aq.)`
Discussion
4640.

Which of the following drug will the doctor prescribe to the patient suffering from body pain and fever ?

Answer»

Iproniazid
Equanil
Seldane
Paracetamol 

ANSWER :D
Discussion
4641.

Which has the higher frequency, infrared light or ultraviolet light? Which has the greater energy?

Answer»

SOLUTION :UV LIGHT, INFRARED
Discussion
4642.

What are lanthanoids ? What is the position of actinoids in periodic table ?

Answer»

Solution :Lanthanoids : Lanthanoids are the elements in which the extra electron (also called differentiating electron) enters (n-2) f-orbital. Since (n-2)f-orbital lies COMPARATIVELY deep within the inner to the penultimate SHELL, these elements are also called inner - transition elements.
La (Z=57) to Lu (Z=71) (15 elements) are considered as Lanthanoids.
The position of ACTINOIDES in periodic table : The position of actinoides in periodic table : The actinoid series contains elements with atomic number 89 to 103 and is present in the third group of peirodic table. The series is the row present below the Lanthanide series which is located underneath the MAIN body of the periodic table.
Discussion
4643.

When an inorganic compound (X) having 3c - 2e as well as 2c - 2e bonds react with ammonia gas at a certain temperature, gives a compound (Y) isostructural with benzene. Compound (X) with ammonia at a high temperature produces a substance (Z). Which option is not correct?

Answer»

(X) is `B_(2)H_(6)`
(Z) is known as inorganicgraphite
(Y) is `B_(3)N_(3)H_(6)`
(Z) is soft LIKE graphite

Answer :D
Discussion
4644.

The solubility product of a compound MX_(2) is 3.2xx10^(-11). Its solubility is :

Answer»

`0.8xx10^(-4)`
`2XX10^(-3)`
`2xx10^(-4)`
`1.6xx10^(-6)`

Solution :`s=((K_(SP))/(4))^(1//3)`
`=((3.2xx10^(-11))/(4))^(1//3)`
`=2xx10^(-4)`
Discussion
4645.

Which of the following statements are correct? (i) Buna-N being resistant to the action of petrol, lubricating oil and organic solvents is used in making oil seals. (ii) Biodegradable polymers are manufactured because of low chemical resistance, strength and durability of conventional polymers (iii) PHBV is a copolymer used in the manufacture of orthopaedic devices (iv)Nylon 2-nylon 6 is a biodegradable polymer.

Answer»

(i), (ii) and (iii)
(ii), (iii) and (IV)
(i), (iii) and (iv)
(i) and (iv)

Solution :Biodegradable polymers are manufactured because CONVENTIONAL polymers are QUITE resistant to the environmental degradation which leads to accumulation of polymeric solid waste materials CAUSING acuteenvironmental PROBLEMS.
Discussion
4646.

Which of the following is the emulsifying agent for both O/W type and W/O type of emulsions

Answer»

SOAPS
Graphite POWDER
PROTEINS
Both 1 & 2

Answer :D
Discussion
4647.

When propionic acid is heated with ammonia give,

Answer»

`CH_(3)CONH_(2)`
`C_(2)H_(5)COONH_(4)`
`C_(2)H_(5)CONH_(2)`
`CH_(3)COONH_(4)`

Solution :`C_(2)H_(5)COOH + NH_(3) to C_(2)H_(5)COONH_(4) C_(2)H_(5)COONH_(4) overset(Delta) to C_(2)H_(5)CONH_(2) + H_(2)O`
Discussion
4648.

Which of the following are peroxoacids of sulfur?

Answer»

`H_(2)SO_(5)` and `H_(2)S_(2)O_8`
`H_2SO_(5)` and `H_(2)S_2O_7`
`H_(2)S_2O_7` and `H_2S_2O_8`
`H_2S_2O_6` and `H_2S_2O_7`

SOLUTION :Both `H_2SO_5` and `H_2S_2O_8` have peroxy LINKAGES.
Discussion
4649.

The species which by definition has ZERO standard molar enthalpy of formation at 298 Kis

Answer»

`Br_(2)(g)`<BR>`Cl_(2)(g)`
`H_(2)O(g)`
`CH_(4)(g)`

Solution :`DeltaH_(f)^(@)(Cl_(2),g)=0, " As "DeltaH_(f)^(@)` of elements in their STANDARD state is taken to be zero.
Discussion
4650.

Total numberof isomeric1^(0),2^(0),3^(0)amines can becalculatedbyformula .

Answer»

`I + 2^(N)`
`I = 2^(n-2)`
`I = 2^(n-3)`
`I = 2^(n-1)`

ANSWER :D
Discussion