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20451.

Which of the following is not a correct statement ?

Answer»

Transparent soap are MADE by dissolving the soap in ethanol and then evaporating excess solvent.
Soaps that float in water are made by beating tiny air bubblesbefore theirhardening .
Medicated soaps contian alcohol to prevent RAPID drying .
Potassium soaps are SOFT to the skin than SODIUM soaps.

SOLUTION :Shaving soaps contain glycerol to prevent rapid drying .
Discussion
20452.

Which of the following are bidentate monoanion ligande?

Answer»

Acetylacetonato
Oxalato ion
Dimethylglyoximato
a) and B) both

Solution :`acac_(Ө)` and dmg_(Ө)
Discussion
20453.

Whichtypeof bondis formedwhenaminesdonatelonepairproton ?

Answer»

Covlaentbond
lonic BOND
Co-ordinatebond
Electrovalentbond

Answer :C
Discussion
20454.

What is the correct explanation of the non - reducing property of sucrose ?

Answer»

`ALPHA` - D - GLUCOPYRANOSE and `beta` - D - fructofuranose are linked via `C_2 and C_1` CENTRES respectively
`alpha` - D - glucopyranose and `beta` - D - fructofuranose are linked via `C_1 and C_2` centres respectively
`alpha` - D - glucopyranose and `beta` - D - fructofuranose are linked via `C_2 and C_2` centres respectively
`alpha` - D - glucopyranose and `beta` - D - fructofuranose are linked via `C_3 and C_4` centres respectively

Answer :B
Discussion
20455.

The standard enthalpy of the decomposition of N_(2)O_(4) to NO_(2) is 58.04 kJ and standard entropy of this reaction is 176.7 J//k. The standard free energy change for this reaction at 25^(@)C is

Answer»

539 KJ
`-539 kJ`
`-5.39 kJ`
`5.39 kJ`

ANSWER :D
Discussion
20456.

Which statement is false :

Answer»

Radon is OBTAINED from the DECAY of radium
Helium is an inert gas
The most abundant noble gas in the atmosphere is He
Xe is the most reactive among the noble gases

Solution :C - is false statement , Order of Abundance `Ar gt NE gt Xe gt Kr gt He`
Discussion
20457.

What is the principle of thermite process ? Name two mealswhich canbe extractedwiththe help of this process.

Answer»

Solution :Thermite isa mixtureofaluminiumpowder andferricoxide. When this MIXTUREIS ignited, Al reduces`Fe_2O_3`to Fe whileit itselfgetsoxidisedto` Al_2 O_3 `.This iscalledthermite process.
` "" 2Al (s)+Fe_2 O _ 3 (s)overset("Ignite ") to Al_2O _ 3 (s)+Fe (L) `
Theunderlyingprincipleof thermiteprocess is that` Delta_f G ^(@) ` of` Al_2 O _3`is much more negativethat that of`Fe _2 O _ 3 `.Besides, Fe, two other metalswhich canbe extractedbythermiteprocess areCr and MN.
` ""Cr_2O_3 +2 Al toAl_2 O _ 3+2 CR`
` ""3 Mn_3O_4 +8 Al to4Al_2O_3 +9 Mn `
Discussion
20458.

The reducing strength of oxyacid of the Phosphorous depends on

Answer»

<P>The number of - atoms directly attached to P
The number of H - ATOM attached to OXYGEN atom
The number of O - atoms attached to P - atoms
The number of P - atoms

Answer :A
Discussion
20459.

Which of the two methods (a) Clemmensen's and (b) Wolff-Kirhner, are best suitable for conversion of CH_(2)=CH-CH_(2)CHO "into " CH_(2) = CH-CH_(2)CH_(3)

Answer»

Solution :Wolff-Kirhner method is the best method as in the other method, DOUBLE BOND GETS REDUCED
Discussion
20460.

Which has maximum number of atoms

Answer»

24 gms of `C_((12))`
56 gms of `Fe_((56))`
27 gms of `Al_((27))`
108 gms of `Ag_((108))`

Solution :12 g. of carbon `=6.023xx10^(23)`
24 g. of Carbon `=(6.023xx10^(23))/12 xx24=12.046xx10^(23)`
But 56 gm, 27 gm. And and 108 gm of FE, AL the Ag respectively contains same no. (Avogardos number) of atoms.
Discussion
20461.

What type of ketones undergo test?

Answer»

Solution :methyl ketones, i.e., ketones containing the grouping, `CH_(3)CO` give IODOFORM test. For eample, acetone, butanone, 2-pentanone,acetophenone, etc.
`UNDERSET("Acetone")(CH_(3)COCH_(3)) overset(I_(2)//NAOH)to underset("Iodoform")(CHI_(3))+ underset("SOD. acetate")(CH_(3)COONa)`
Discussion
20462.

Which of the following gas is evolved when crystals of K_(4)[Fe(CN)_(6)] is heated with conc. H_(2)SO_(4) ?

Answer»

`CO_(2)`
`NO_(2)`
CO
`SO_(2)`

ANSWER :C
Discussion
20463.

Which of the following reduction is not thermodynamically feasible?

Answer»

`Cr_(2)O_(3)+2Al to Al_(2)O_(3)+2Cr`
`Al_(2)O_(3)2Cr to Cr_(2)O_(3)+2Al`
`3TiO_(2)+4Al to 2Al_(2)O_(3)+3Ti`
NONE of these

Answer :B
Discussion
20464.

Which method of purification is represented by the following equations ? M+2I_2overset(573K)rarrMI_4overset(1675K)rarrM+2I_2

Answer»

POLING
ZONE REFINING
CUPELLATION
VAN Arkel

Answer :D
Discussion
20465.

Which of the following is not a drying and dehydrating agent ?

Answer»

SILICA GEL
`P_2O_5`
CONC.`H_2SO_4`
HYDRATED `CaCl_2`

ANSWER :D
Discussion
20466.

Which of the following reactions of glucose can be explained only by its cyclic structure ?

Answer»

Glucose FORMS pentaacetate.
Glucose reacts with hydroxylamine to form an oxime
Pentaacetate of glucose does not react with hydroxylamine.
Glucose is oxidised by NITRIC acid to gluconic acid.

Solution :DUE to the absence of OH group at `C_(1)`, cyclic structure of glucose pentaacetate cannot revert to open chain aldehydic from. Hence, it cannot form an oxime.
Discussion
20467.

Write the formulae of the monomers of polythene and teflon.

Answer»

SOLUTION :(i) `CH_2=CH_2`
(II) `CF_2=CF_2`
Discussion
20468.

Write one chemical equation to show that SO_2 acts as a reducing agent.

Answer»

SOLUTION :`2H_2S (g) + SO_2 (g) underset(673 K) OVERSET(Fe_2O_3 " CATALYST ")to 2H_2O (g) + 3S (s)`
Discussion
20469.

The SOP values of A,B,C and D are -0.03 V,+0.1.08 V,0.34 V and -2.37 Vrespectively. The spontaneous cell reaction takes place between

Answer»

A and B
B and C
D and A
B and D

Solution :Large DIFFERENCE in SOP gives spontaneous cell reaction.
Discussion
20470.

Which forms p pi - p pimultiple bonds with itself and with C and O ?

Answer»

P, As
N, As
N,P
N

Solution :NITROGEN - can form `p pi - p pi ` MULTIPLE bonds with H self as well as CARBON and OXIGEN
Discussion
20471.

Which one the following formula is used to calculate the density of the unit cell ?

Answer»

`RHO=(NM)/(a^(3)N_(A))`
`rho=(a^(3)N_(A))/(nM)`
`rho=(N_(A))/(a^(3)NM)`
`rho=(a^(3)NM)/(N)`

ANSWER :A
Discussion
20472.

What are food preservatives ? Give one example.

Answer»

Solution :The chemical substances which are added to the FOOD materials to prevent their SPOILAGE and to RETAIN their NUTRITIVE value for longperiods are called food preservatives. For example, sodium benzoate, sodium metabisulphite ETC.
Discussion
20473.

Which one of the following is not a primary amine.

Answer»

Tert-butylamine
Ethylamine
Sec-butylamine
Iso-butylamine

Solution :Primary amine MEANS `R-NH_(2)` group.
`CH_(3)-underset(CH_(3))underset(|)overset(CH_(3))overset(|)(C)-NH_(2) CH_(3)CH_(2)-NH_(2)`
`CH_(3)-underset(NH_(2))underset(|)(C)-CH_(2)-CH_(3)CH_(3)-underset(CH_(3))underset(|)(CH)-CH_(2)NH_(2)`
`CH_(3)-NH-CH_(3)`
Discussion
20474.

Which one of the following IUPAC names is correct ?

Answer»

2-Methyl-3-PENTANE
2-Ethyl-3-methyl pentan
2-Ethyl-3-methyl pentane
3-Methyl-2-ethyl pentane.

ANSWER :C
Discussion
20475.

What is the coordination number of each sphere in :Body-centred cubic structure.

Answer»

SOLUTION :Coordination, number of each SPHERE in (ii)BCC is 8
Discussion
20476.

Which among the following is a Lewis acid?

Answer»

`H_2O`
`B_2H_6`
`NH_3`
`CH_3OH`

ANSWER :1
Discussion
20477.

Which of the following system has maximum number of the unpaired electrons in an inner octahedral complex?

Answer»

`d^4`
`d^9`
`d^7`
`d^5`

ANSWER :A
Discussion
20478.

Transition elements show high melting points. Why?

Answer»

Solution :Due to involvement of greater NUMBER of electrons in the interatomic metallic bonding form (n - 1) d-orbitals in ADDITION to NS electrons, transition elements show high MELTING point .
Discussion
20479.

Whichone of the biomoleculeis insolublein water ?

Answer»

KERATIN
Haemolgobin
RIBONUCLEASE
ADENINE

ANSWER :A
Discussion
20480.

The total number of atoms of all elements present in mole of ammonium dichromate is

Answer»

19
`6.023xx10^(23)`
`114.473xx10^(23)`
`84.322xx10^(23)`

Solution :AMMONIUM dichromate is `(NH_(4))_(2)Cr_(2)O_(7)`
1 mole of it CONTAINS of 2 moles of N atoms,
8 moles of H atoms,2 moles of Cr atoms and 7 moles of O-atoms.
`therefore " TOTAL atoms ofall elements "=2+8+2+7`
`="19 moles"=19xx6.023xx10^(23)" atoms"`
`=114.437xx10^(23)`
Discussion
20481.

What are the monomers of SBR.

Answer»

SOLUTION :1,3-Butadiene, `CH_2 = CH - CH= CH_2` (75%) and STYRENE, `(C_6H_5CH = CH_2)` (25%)
Discussion
20482.

What is the maximum oxidation state that nitrogen can have ?

Answer»

`+3`
`+3`
`+5`
`+8`

ANSWER :C
Discussion
20483.

Which compound would give 5-keto-2-methyl hexanal upon ozonolysis

Answer»




SOLUTION :
Discussion
20484.

Which element was named as eka-silicon in Mendeleev classification of elements?

Answer»

GERMANIUM
Gallium
Thallium
Selenium

Solution :Mendeleev PREDICTED an element for a gap below silicon and NAMED it eka-silicon because he believed that it would be SIMILAR to silicon. It was discovered by WINKLER and named germanium.
Discussion
20485.

Which product is obtained when primary alcohol is oxidised with KMnO_(4) or H_(2)CrO_(4)?

Answer»

Aldehyde
Ketone
ACID
Ester

Solution :Acid
Discussion
20486.

What is burnt alum?

Answer»

Solution :When potash alumn is HEATED at 365 K. It MELTS and form MOLTEN state. Again heated at 475 K they lose water of hydration and swell up. Thee swollen mass is known as burnt alum.
Discussion
20487.

Which of the 3d series of the transition metals exhibits the largest number of oxidation states and why ?

Answer»

SOLUTION :Manganese (Z = 25) SHOWS maximum number of oxidation states because of its electronic configuration `3D^(5)4s^(2)`. As 3d and 4s are close in energy, it has maximum number of electrons to lose or share (as all the 3d electrons are unpaired). HENCE, it shows maximum oxidation states from `+2` to `+7(+2,+3,+4,+5,+6" and "+7)`.
Discussion
20488.

What is solubility ? Explain solubility of solid solute in liquid solvent.

Answer»

Solution :Solubility of a substance is its maximum amount that can be dissolved in a specified amount of solvent at a specified temperature.
Every solid does not dissolve in a given liquid. While sodium chloride and sugar dissolve readily in water, napthalene and ANTHRACENE do not. On the other HAND, napthanlene and anthracene dissolve readily in benzene but sodium chloride and sugar do not.
It is observed that polar solutes dissolve in polar solvents and non - polar solutes in nonpolar - solvents.
In general, a solute dissolves in a solvent if the intermolecular interactions are similar in the two or we may say like dissolves like.
When a solid solute is added to the solvent, some solute dissolves and its concentration increases in solution. This PROCESS is known as dissolution. Some solute particles in solution collide with the solid solute particles and get separated out of solution. This process is known as crystallisation.
A stage is reached when the two processes occur at the same rate. Under such conditions, NUMBER of solute particles going in to solution will be equal to the solute particle separating out and a state of dynamic equilibrium is reached. Solute + Solvent `hArr` Solution
At this stage the concentration of solute in solution will remain constant under the given conditions, i.e., temperature and pressure. Similar process is followed when gases are dissolved in liquid solvents.
Such a solution in which no more solute can be dissolved at the same temperature and pressure is called a saturated solution.
An unsaturated solution is one in which more solute can be dissolved at the same temperature. The solution which is in dynamic equilibrium with undissolved solute is the saturated solution and contains the maximum amount of solute dissolved in a given amount of solvent. Thus, the concentration of solute in such a solution is its solubility.
Earlier we have observed that solubility of one substance into another depends on the nature of the substances. In addition to these variables, two other parameters, i.e., temperature and pressure also control this phenomenon.
(i) Effect of temperature : Thye solubility of solid in a liquid is significaqntly affected by temperature changes. This, being dynamic equilibrium, must gollow Lw Chateliers Principle. Solid (Solute) + Liquid (Solvent) `hArr` Solution In general, if in a NEARLY saturated solution,the dissolution process is endothermic `Delta H lt 0`means `Delta H = - ve`. This indicates exothermic reaction `Delta H=-ve`. This indicates exothermic reaction (non - endothermic). While `Delta H gt 0` means `Delta H = + ve` (endothermic) (non - exothermic). The solubility should increase with rise in temperature and if it is exothermic `(Delta_(sol)H gt 0)` the solubility should decrease.
(ii) Effect of pressure : Pressure does not have any significant effect on solubility of solids in liquids. It is so because solids and liquids are highly incompressible and practically remain unaffected by changes in pressure.
Discussion
20489.

The wrong statement about fullerene is.

Answer»

it has 5-membered carbon ring.
it has 6-membered carbon ring.
it has `sp_2` hybridization.
it has 5-membered RINGS more than 6-membered rings.

Solution :it has 5-membered rings more than 6-membered rings. Fullerence CONSISTS of 12 five-membered rings and 20 SIX-membered rings. So it has five membered rings less than six membered rings
Discussion
20490.

Which of the following is an azo dye

Answer»

Organe-I
Malachite green
Phenolphthalein
Methylene blue

Solution :Orange-I is an ACID AZODYE.
Discussion
20491.

What problem arises in using alitame as artificial sweetener ?

Answer»

It decomposes when ADDED to the food items
It provides a huge number of calories to the food
It is difficult to control the sweetness of food while USING it
In INCREASES the volume of the contents to a LARGE extent

Answer :C
Discussion
20492.

Who was awarded Nobel Prize for chemistry in 1901 for discovering laws of osmotic pressure for solutions ?

Answer»

van't Hoff
Pauling
Berkeley
Seaberg

Answer :A
Discussion
20493.

The value of log_(10)K for a reaction AhArrB is (Given : DeltarH_(298K)^(@)=-54.07kJmol^(-1),DeltarS_(298K)^(@)=10JK^(-1)mol^(-1),R=8.314JK^(-1)mol^(-1),2.303xx8.314xx298=5705)

Answer»

5
10
95
100

Answer :B
Discussion
20494.

What is/are the coordination number(s) of Au in the complexes formed by Au?

Answer»

6
4
5
2

Answer :B::D
Discussion
20495.

Which of the following is correct statements ?

Answer»

Optical ACTIVE ISOMERS have same geometrical shape
Optical active isomers have different geometrical shape
Optical active isomers have same different chemical PROPERTIES
Optical active isomers have same configuration

Answer :B
Discussion
20496.

Which is the most suitable reagent for the following conversion ? CH_(3)-CH=CH-CH_(2)-overset(O)overset("||")C-CH_(3) to CH_(3)-CH=CH-CH_(2)-overset(O)overset("||")C-OH

Answer»

Tollens' REAGENT
Bonzoyl peroxide
`I_(2)` and NaOH SOLUTION
Sn and NaOH solution

ANSWER :C
Discussion
20497.

Which one is false among the following statement?

Answer»

A catalyst is specific in its action.
A very small amount of catalyst ALTERS the RATE of a reaction
NI is used as catalyst in the manufacture of ammonia.
None of these

Answer :C
Discussion
20498.

When phenol is reacted with CHCl_(3) and NaOH followed by acidification, salicyldehyde is obtained . Which of the following species are involved in the above mentioned reactioin as inter mediate

Answer»




All of these

Solution :
Discussion
20499.

Calculate the octane number of gasoline fuel, which contains 25% n - heptane and 75% is iso - octane.

Answer»

25
50
75
100

Answer :C
Discussion
20500.

What is the action of 2, 4-dinitrophenyl hydrazine on acetaldehyde ?

Answer»

SOLUTION :ACETALDEHYDE on reaction with 2, 4-dinitrophenyl HYDRAZINE forms 2, 4-dinitrophenyl hydrazone.
Discussion