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2951.

Which solution will show the maximum vapour pressure at 300K

Answer»

<P>1 M NaCl
`1 M CaCl_(2)`
`1 MCH_(3)COOH`
`1 MC_(12) H_(22) O_(11)`

SOLUTION :Sucrose will give minimum value of `Delta p`and THUS `Delta p=P_(1)^(o)-p or P_(1)^(o)= P_(0)- Delta P` is maximum.
Discussion
2952.

Write the mathematical form of Raoult's law of relative lowering of vapour pressure.

Answer»

<P>

SOLUTION :`(p^(@)-p_(s))/(p^(@))=(n_(2))/(n_(1)+n_(2))`
Discussion
2953.

Which reducing agent is used for the following conversion ?RCOOH to RCH_2OH

Answer»

`LiAlH_4`
`NaBH_4`
`K_2Cr_2O_7`
`KMnO_4`

ANSWER :A
Discussion
2954.

What will be the volume of a given mass of a pressure of 50 cmof Hg., if the occupics 260 mL at a pressure of 98 cm of Hg keeping the temperature constant.

Answer»

<P>520ml
620ml
510ml
610ml

Solution :`P_(1)V_1 = P_(2)V_(2)`
Discussion
2955.

Which of the reaction defines DeltaH_(f)^(@)

Answer»

`C_(("diamond"))+O_(2(g))rarrCO_(2(g))`
`(1)/(2)H_(2(g))+(1)/(2)F_(2(g))rarrHF_((g))`
`N_(2(g))+3H_(2(g))rarr2NH_(3(g))`
`CO_((g))+(1)/(2)O_(2(g))rarrCO_(2(g))`

Solution :`DeltaH_(f)^(@)` is the enthalpy CHANGE when 1 mole of the substance is formed from its elements in the standard state. In (a) carbon is present in diamond however its standard state is GRAPHITE. Again, in (d) CO (g) is involvedso it can't be the right option. Further inn (c ) 2 MOLES of `NH_(3)` are generated. HENCE the correct option is (b).
Discussion
2956.

To 25 ml of H_(2)O_(2) solution, excess of acidified solution of KI was added. The iodine liberated required 20 ml of 0.1 N Na_(2)S_(2)O_(3) solution. Calculate the % of H_(2)O_(2) solution.

Answer»

0.000136
0.00136
6.8E-5
0.00068

Answer :B
Discussion
2957.

Which of the following is a fully fluorinated polymer ?

Answer»

NEOPRENE
TEFLON
THIOKOL
PVC

Answer :B
Discussion
2958.

Which one the most Reactive towords electrophilic Reagent:

Answer»




ANSWER :D
Discussion
2959.

When phenol is treated with excess of bromine water, it gives

Answer»

m-bromophenol.
o-and p-bromophenol.
2,4-dibromophenol.
2,4,6-tribromophenol.

Answer :D
Discussion
2960.

The vapour pressure of liquiddecreases with rise of temperature .(true/false)

Answer»

SOLUTION :INCREASES
Discussion
2961.

The solubility product of AgCl is 1.0xx10^(-10). The equilibrium constant of the reactionAgCl(s) + Br^(-) iff AgBr(s) + Cl^(-)is 2 xx 10^2 and that of the reaction 2AgBr(s) + S^(2-) iff Ag_2S(s) + 2Br^(-)is 1.6 xx 10^24 . Calculate K_(sp) of Ag_2S

Answer»

SOLUTION :`1.56 XX 10^(-49)`
Discussion
2962.

The specific conductance of a solution is 0.2 ohm^(-1)" "cm^(-1) and conductivity is 0.04 ohm^(-1). The cell constant would be

Answer»

1 `cm^(-1)`
0 `cm^(-1)`
5 `cm^(-1)`
0.2 `cm^(-1)`

Solution :`K=Cxx`CELL CONSTANT`=(K)/(C)=(0.2)/(0.04)=5cm^(-1)`.
Discussion
2963.

The structural formula of a compound, C_(6)H_(11) N (X) that is optically active dissolves in dil. Aq. HCl, and releases N_(2) with nitrous acid. The compound X is

Answer»



`C_(6)H_(5)CH (NH_(2)) CH_(3)`
`C_(6)H_(5) - NH - C_(2)H_(5)`

Solution :
Compound X is optically active as such it must have a chiral carbon atom. Fuether it must be a primary amine SINCE it releases `N_(2)` GAS on reaction with nitrous acid.
Discussion
2964.

Which one of the following is an organic acid ?

Answer»

Hydrochloric acid
Nitric acid
Acetic acid
Sulphuric acid

Solution :ORGANIC acid is a type of organic compound that typically has acidic properties. A common example of organic acid are CALLED carboxyl acids, which are generally KNOWN as weak acids and do not totally dissociated in a medium such as water, unlike with strong MINERALS. The simplest form of organic acids, such as acetic and formic, are typically used in stimulation treatments against corrosion for GAS and oil, since these are less reactive compared to hydrochloric acid and other strong acids.
Discussion
2965.

Which one of the following compounds do not give a primary alcohol on reduction

Answer»

Propanoic acid
Propanal
Methyl propanoate
Propan-2-one

Solution :`CH_(3)-overset(O)overset(||)(C )-CH_(3) overset(LiAIH_(4))rarr CH_(3)-overset(OH)overset(|)UNDERSET(H)underset(|)(C )-CH_(3)`
Discussion
2966.

Which of the following statement is incorrect:-

Answer»

`AGCL LT AgF "solubility in "H_(2)O`
`KCl lt KI"solubility in acetone"`
`BeC_(2)O_(4) lt BaC_(2)O_(4)"solubility in "H_(2)O`
`CaCrO_(4) gt BaCrO_(4)"solubility in "H_(2)O`

SOLUTION :(i) In AgCl more polarisation so LESS solubility
(II) In KI more polarisation so more solubility in organic solvent
(iii) `BeC_(2)O_(4)`more soluble due to high hydration energy
(iv) `CaCrO_(4)`has more solubility due to high hydration energy.
Discussion
2967.

Which of the following correctly represents the effect of increase of temperature on adsorption ?

Answer»

Chemical adsorption INCREASE regularly wherease physical adsorption first DECREASES and then increases.
Physical adsorption decreases regularly whereas chemical adsorption first increases and then decreases.
Chemical adsorption first decrease and then increase whereas physical adsorption shows the opposite trend.
Physical adsorption first decreases and then increases whereas chemical adsorption shows the opposite trend.

Solution :is the CORRECT option
Discussion
2968.

Which one of the following is formed when ethene reacts with Baeyer's reagent?

Answer»

ETHANE
ETHYLENE GLYCOL
Propane-1.2-diol
GLYCEROL

SOLUTION :Ethylene glycol
Discussion
2969.

Which of the following is liquefiable gas?

Answer»

`SO_2`
`H_2`
`N_2`
`O_2`

SOLUTION :`SO_2`
Discussion
2970.

Which one of the following ions is the most stable in aqueous solution (At.No. Ti = 22, V = 23, Cr = 24, Mn = 25)

Answer»

`V^(3+)`
`TI^(3+)`
`MN^(3+)`
`Cr^(3+)`

ANSWER :D
Discussion
2971.

Write the structure of 4-chloropentan-2-one

Answer»

Solution :STRUCTURE of 4-chloropent-2-ore
`CH_(3) - UNDERSET( CL) underset( |)OVERSET( H ) overset( |)(C ) - CH_(2) - underset( O ) underset( ||)(C ) - CH_(3)`
Discussion
2972.

Zinc reacts with CuSO_4 according to the equation Zn + CuSO_4 toZnSO_4 + Cu. If excess of zinc is added to 100ml of 0.05M CuSO_4, the amount of copper formed

Answer»

0.6354 g
0.3177 g
3.177 g
6.345 g

Answer :B
Discussion
2973.

Which of the following is not a d-block element?

Answer»

Hg
Po
Ni
W

Answer :B
Discussion
2974.

Which of the following reacts fastest with Lucas reagent ?

Answer»

1- BUTANOL
2- Butanol
2-Methyl propan-2-ol
2- Methylpropanol .

ANSWER :D
Discussion
2975.

Which of the followingis not a molecular hydride

Answer»

`NH_(3)`
`PH_(3)`
`B_(2)H_(6)`
`CaH_(2)`

ANSWER :D
Discussion
2976.

Which is the example of copolymer ?

Answer»

Buna-S
TEFLON
PVC
POLYPROPYLENE

SOLUTION :Buna-S
Discussion
2977.

When SiCl_4 vapours are passed over hot Mg,the products formed are:

Answer»

`SiCl_2` + `MgCl_2`
`Mg_2Si` + `Cl_2`
SI + `MgCl_2`
`MgSiCl_6`

ANSWER :C
Discussion
2978.

What is condition of Cannizzaro's reaction ?

Answer»

Solution :Cannizaro.s REACTION is shown by only those CARBONYL COMPOUNDS which contain no `PROP`-hydrogenation. So only formaldehyde shown this type of reaction.
Discussion
2979.

What is the basic difference between antiseptics ad disinfectants ?

Answer»

Solution :Antiseptics and disinfectants both are antimicrobials. Antiseptics PREVENT or destroy DEVELOPMENT or inhibit the pathogenic action of MICROBES. They are safe to be appliedon living tissues.
On the other hand, disinfectants also kill microorganisms but are not safe to be applied on living tissues. They are generally applied on non-living objects such as drains, toilets, floors and living ROOMS INFECTED with bacteria and disease carrying germs.
Discussion
2980.

When a white crystalline compound X is heated with K_(2)Cr_(2)O_(7) and concentrated H_(2)SO_(4) a, areddish brown gas A is evolved. On passing A into caustic soda solutions, a yelow coloured solution of B is obtained. Neutralizing the solutionBwith aceticacid and on subsequent addition of lead acetate, a yellow precipitate C is obtained.When X is heated with NaOH solution, a colourless gas is evolved andon passing this gas into K_(2)HgI_(4) solution, a reddish brown precipitate D is formed. Identify A,B,C,D and X. Write the equation of the reaction involved.

Answer»

Solution :
The chemical REACTIONS involved are as follows `:`
`4NH_(4)Cl+ K_(2)Cr_(2) O_(7) + 6 H_(2)SO_(4) rarr underset( "Reddish brown")(2CrO_(2)Cl_(2)) + 4NH_(4) HSO_(4) _ 2KHSO_(4) + 3H_(2)O`
`CrO_(2)Cl_(2) + 2NaOH rarr underset("Yellow sol. ")(Na_(2)CrO_(4))+2HCl`
`NH_(4)Cl NaOH rarr NACL+ NH_(3) + H_(2)O`
`2K_(2)HgI_(4) + NH_(3)+3KOH rarr NH_(2) HGO + 7KI + 2H_(2)O`
Discussion
2981.

The reduction potential for the two half cell reactions are : Cu^(2+) + e^(-) to Cu^(+),E^(@) = 0.15 V Cu^(+) + e^(-) to Cu,E^(@) = 0.50 V Calculate reduction potential for the following reaction : Cu^(2+) + 2e^(-) to Cu

Answer»

SOLUTION :This can be solved in TERMS of their free energy changes .
(i) `Cu^(2+) + e^(-) to Cu^(+) "" E_(1)^(@) = 0.15` V
`Delta G_(1)^(@) = - 1 xx F xx 0.15 = -0.15 F`
(ii) `Cu^(+) + e^(-) to Cu "" E_(2)^(@) = 0.50` V
`Delta G_(2)^(@) =-1XX F xx 0.50 = -0.50 F`
(iii) `Cu^(2+) + 2e^(-) to Cu "" E_(3)^(@) = ?`
`Delta G_(3)^(@) = - 2 xx F xx E_(3)^(@) = - 2 E_(3)^(@) F`
Now `Delta G_(3)^(@) = Delta G_(1)^(@) + Delta G_(2)^(@) = - 0.15 F- 0.50 F = -0.65 F`
`THEREFORE E_(3)^(@) = (0.65 F)/(2 F) = 0.325 V`
Discussion
2982.

Which type of soap contains fillers like sodium rosinate, sodium silicate, borax and sodium carbonate?

Answer»

TOILET SOAPS
MEDICATED Soaps
Laundry Soaps
Normal Soaps

Solution :soap contains fillers LIKE sodium rosinate, sodium silicate, BORAX and sodium carbonate
Discussion
2983.

Which of the following compounds is expected to be optically active?

Answer»

`(CH_(3))_(2)CHCHO`
`CH_(3)CH_(2)CH_(2)CHO`
`CH_(3)CH_(2)CH(Br)CHO`
`CH_(3)CH_(2)CBr_(2)CHO`

Answer :C
Discussion
2984.

Which of the following contains equal number of atoms ?

Answer»

11.2 ML of `N_(2)` and 0.015g of NITRIC oxide
22.4 L of nitrous oxide and 22.4L of `CO_(2)`
1 mole of HCl and 0.5 mole of `H_(2)S`
1 mole of `H_(2)O_(2)` and 1 mole of `H_(2)SO_(4)`

Answer :A::B
Discussion
2985.

Which of the following has least conductivityin aqueous solution ?

Answer»

`Co(NH_(3))_(4)Cl_(3)`
`Co(NH_(3))_(3)Cl_(3)`
`Co(NH_(3))_(5)Cl_(3)`
`Co(NH_(3))_(6)Cl_(3)`.

SOLUTION :`[Co(NH_(3))_(3)Cl_(3)]` is non-conducting.
Discussion
2986.

What are roasting and calcination?

Answer»

Solution :ROASTING : Roasting is the method, USUALLY applied for the conversion of sulphide ORES into their oxides. In this method, the concentratedore is oxidized by heating it with excess of oxygen in a suitable furnace below the melting point of the metal.
CALCINATION : It is the process in which the concentrated ore is strongly heated in the absence of air. Hence ore is CONVERTED into their oxides.
Discussion
2987.

Which of the following react to give the usual product?

Answer»

Di-tert. BUTYL ketone+Methyl MAGNESIUM bromide
Methyl ISOPROPYL ketone+methyl magnesium bromide
Methyl isopropyl ketone+tert. Butyl magnesium bromide
Acetamide+methyl magnesium bromide

Answer :B::D
Discussion
2988.

Which of the following system has maximum value of mu (only spin magnetic moment) ?

Answer»

`d^(5)(Delta_(0)GTP)`
`d^(8)` (TETRAHEDRAL)
`d^(6)` (HIGH spin)
`d^(9)` (octahedral)

Answer :C
Discussion
2989.

Which one of the following on hydrolysis , gives the correponding metallic hydroxide , H_(2)O_(2) and O_(2)

Answer»

`Li_(2)O`
`Na_(2)O_(2)`
`NaO_(2)`
`Na_(2)O`

Solution :`2NaO_(2) to 2H_(2)O to 2NaOH +H_(2)O_(2) +O_(2)`
Discussion
2990.

When X ampress pf current is passed through molten AlCl_(3) for 96.5 seonds 0.09 grams of aluminium is deposited. What is the value of X?

Answer»

10
20
30
40

Answer :A
Discussion
2991.

What are the products of the following reactions? C_(6)H_(5)OCH_(2)CH_(2)OH underset("heat")overset("excess HBr")to

Answer»

`C_(6)H_(5)OH+BrCH_(2)CH_(2)Br`
`C_(6)H_(5)OH+HOCH_(2)CH_(2)OH`
`C_(6)H_(5)Br+HOCH_(2)CH_(2)OH`
`C_(6)H_(5)OH+BrCH_(2)CH_(2)OH`

SOLUTION :`C_(6)H_(5)OCH_(2)CH_(2)OH underset(Delta)overset("EXCESS HBr")to C_(6)H_(5)OH+BrCH_(2)CH_(2)Br`.
Discussion
2992.

Which of the followingreaction increases production of dihydrogen from synthesisgas

Answer»

`CH_(4)(g)+H_(2)(g)underset(Ni)overset(1270k)rarrCO(g)+3H_(2)(g)`
`C(s)+H_(2)O(g)overset(1270k)rarrCO(g)+H_(2)(g)`
`CO_(g)+H_(2)(g)underset(catalyst)overset(673k)rarrCO_(2)(g)+H_(2)(g)`
`C_(2)H_(6)+2H_(2)Ounderset(Ni)overset(1270k)rarr2CO+5H_(2)`

Answer :C
Discussion
2993.

Which of the following represents the graph between log p (on Y-axis) and 1/T (on X-axis) ?

Answer»




ANSWER :B
Discussion
2994.

The tertiary nitro compound is…………..

Answer»

2-nitropropane
1-nitropropane
1-nitro-2,2-dimethyl propane
2-nitro-2-methyl propane

Answer :D
Discussion
2995.

What causes Brownian motion in colloidal dispersion ?

Answer»

Solution :The UNBALANCED borbardment of the colloidal particles by molecules of dispersion medium which are in CONSTANT motion like molecules in a gas. As, a result the colloidal particles acquire ALMOST the same amount of KINETIC energy as possessed by the molecules of the dispersion medium.
Discussion
2996.

Which of the following compounds will undergo self aldol condensation in presence of cold dilute alkali :

Answer»

`C_6H_5CHO`
`CH_2=CH-CHO`
`CH_2CH_2CHO`
NONE

ANSWER :C
Discussion
2997.

The value of 'spin only ' magnetic moment for one of the followingconfiguration is 2.84 BM. Thecorrect one is

Answer»

`d^(4)` in strong ligand field)
`d^(4)` ( in weak ligand field
`d^(3)` ( in weak as well as strong fields)
`d^(5)`( in strong ligand field )

Solution :`mu=sqrt(n(n+2))=2.84BM` MEANS n=2. Only `d^(4)` in strong field can have TWO UNPAIRED electrons.
Discussion
2998.

Toulene may be oxidised to Benzaldehyde by the use of _____

Answer»

`KMnO_4+H_2SO_4`
`K_2Cr_2O_7+H_2SO_4`
`CrO_2Cl_2`
All of these

Answer :B::C
Discussion
2999.

What is decreasing order of basicity of PST ethyl amines and NH_3 :

Answer»

`NH_3 GT C_2H_5NH_2 gt (C_2H_5)_2NH gt(C_2H_5)_3N`
`(C_2H_5)_3N gt (C_2H_5)_2NH gt C_2H_5NH_2 gt NH_3`
`(C_2H_5)_2NH gt C_2H_5NH_2 gt NH_3 gt (C_2H_5)_3N`
`(C_2H_5)_2NH gt (C_2H_5)_3N gt C_2H_5NH_2 gt NH_3`

ANSWER :D
Discussion
3000.

Which of the following have P - O - P bond ?

Answer»

HYPOPHOSPHOROUS ACID
PHOSPHOROUS acid
Pyrophosphoric acid
Orthophosphoric acid

ANSWER :C
Discussion