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6151.

Which of the following does not react with Agcl

Answer»

`Na_2S_2O_3`
`NH_4OH`
`NaNO_3`
`Na_2CO_3`

ANSWER :C
Discussion
6152.

Which of the following oxidation is the most common among the lanthanolds ?

Answer»

4
2
5
3

Answer :d
Discussion
6153.

What precipitate is formed when an aldehyde reacts with Fehling.s solution ?

Answer»

SOLUTION :CUPROUS OXIDE `CU_2O`
Discussion
6154.

Two liquids A and B are mixed at temperature T in a certain ratio to form an idela solution. It is found that the partial vapoure pressure of A. i.e, P_(A) is equal to p_(s). The vapoure pressure of B for the liquid mixture. Whatis the total vapour pressure of the liquid mixture in terms of P_(A)^(@) and P_(B)^(@) ?

Answer»

<P>`(P_(A)^(@)P_(B)^(@))/(P_(A)^(@)+P_(B)^(@))`
`(2P_(A)^(@)P_(B)^(@))/(P_(A)^(@)+P_(B)^(@))`
`(P_(A)^(@))/(P_(A)^(@)+P_(B)^(@))`
`(2P_(B)^(@))/(P_(A)^(@)+P_(B)^(@))`

ANSWER :B
Discussion
6155.

What is the pH of an aqueous solution obtained by mixing 6 gram of acetic acid and 8.2 gram of sodium acetate and making the volume equal to 500ml. (Given: K_a for acetic acid is 1.8 times 10^-5)

Answer»

Solution :ACCORDING to Henderson- Hessalbalch equation,
`pH=pK_a+log (["salt"])/(["acid"])`
Given that `K_a=1.8 times 10^-5`
`therefore pK_a=-log K_a=-log(1.8 times 10^-5)=4.74`
`["Salt"]=( "Number of moles of sodium acetate")/( "Volume of the solution (LITRE)")`
Number of moles of sodium acetate= `("mass of sodium acetate")/("molar mass of sodium acetate")=8.2/8.2=0.1`
`therefore["Salt"]=(0.1 MOLE)/(1/2 litre)=0.2M`
`["acid"]=(("mass of" CH_3COOH//"Molar mass of" CH_3COOH))/("volume of solution in litre"))=((6//60))/12=0.2M`
`therefore pH=4.74+log ((0.2))/((0.2))`
`pH=4.74+log 1`
`pH=4.74+0=4.74`
Discussion
6156.

Whichof the followingis incorrect IUPAC name ?

Answer»

N-(propyl) PROPAN -2-AMINE
N-(2-propyl) porpan -1- amine
dimethylethanamine
N-ethylcyclohexnamine .

ANSWER :A
Discussion
6157.

Z is

Answer»

`P_4O_8`
`P_4O_6`
`P_4O_(10)`
None

Solution :
`Z=P_4O_(10)`
Discussion
6158.

Which one is not a Sandmeyer reagent ?

Answer»

`Cu_(2)Cl_(2)+HCl` <BR>`Cu_(2)Br_(2)+HBR`
`Cu_(2)(CN)_(2)+KCN`
`Cu_(2)I_(2)+KI`

Answer :D
Discussion
6159.

Which of the following option is incorrect

Answer»

B is purified by Van Arkel METHOD because `BI_(3)` is volatile iodile.
Si and Ge are purified by ZONE refining method.
Chemical reaction:`Fe_(2)O_(3)+Al to Al_(2)O_(3)+Fe`
("its an endothermic process)
The affinity of `CU^(2+)` towards `S^(-2)` is more than `O^(-2)`

Answer :C
Discussion
6160.

Write IUPAC name of the following compound : ""(CH_(3)CH_(2))_(2)NCH_(3)

Answer»


ANSWER :`CH_(3)CH_(2)-underset(underset(CH_(3)CH_(2))(|))(N)-CH_(3)`
N-Methyl-N-ethylethanamine
Discussion
6161.

Which of the following statements are correct regarding N-methyl aniline?

Answer»

It is less basic than ANILINE.
It is optically inactive DUE to rapid pyramidal inversion.
ft is more reactive than aniline towards `Br_(2)`/Fe.
It is soluble in DIL. HCI.

Answer :B::C::D
Discussion
6162.

What is the type of hybridisation of carbon in haloarenes ?

Answer»

SOLUTION :`SP^(2) `
Discussion
6163.

Which of the following is not considered as absorption

Answer»

chalk PIECE DIPPED in ink 
sponge placed in WATER 
finely divided CHARCOAL stirred with dilute acetic acid 
`H_2`, gas in contact with finely divided Pd 

Solution :In ABSORPTION the substance is uniformly distributed throughout the bulk of the solid
Discussion
6164.

Which statement is not correct with referance to alcohol ?

Answer»

Ethanol is HEAVIER than the water
Ethyl alcohol is a VOLATILE liquied
Lower MOLECULAR weight alcohols are water soluble.
Alcohol produces `H_(2)` gas with Na. metal.

Solution :Ethanol is heavier than the water
Discussion
6165.

Which of the following equilibria would have highest value of K_(p)at a common temperature:-

Answer»

<P>`BeCO_(3) HARR BeO+CO_(2)`
`SrCO_(3) hArr SrO+CO_(2)`
`CaCO_(3) hArr CaO+CO_(2)`
`BaCO_(3) hArr BaO +CO_(2)`

Solution :`K_(P)= P_(CO_(2))`
`P_(CO_(2)) (uarr) = K_(P) (uarr)`
Stability order:
`BeCO_(3) lt MgCO_(3) lt CaCO_(3) lt SrCO_(3) lt BaCO_(3)`
Discussion
6166.

Which one of the following is not feasible

Answer»

`Zn_((s)) + Cu_((aq))^(2+) RARR Cu_((s)) + Zn_((aq))^(2+)`
`Cu_((s)) + Zn_((aq))^(2+) rarr Zn_((s)) + Cu_((aq))^(2+)`
`Cu_((s)) + 2Ag_((aq))^(+) rarr Ag_((s)) + Cu_((aq))^(2+)`
`Fe_((s)) + Cu_((aq))^(2+) rarr Cu_((s)) + Fe_((aq))^(2+)`

ANSWER :B
Discussion
6167.

The values of heat of formation of SO_(2) and SO_(3)are -298.2 kJ and -98.2 kJ. The heat of reaction of the following reaction will be SO_(2)+(1)/(2)O_(2)rarrSO_(3)

Answer»

`-200` kJ
`-356.2` kJ
`+200 kJ`
`-396.2 kJ`

Solution :`S+O_(2)rarrSO_(2)""DeltaH=-298.2 kJ"...(i)"`
`SO_(2)+(1)/(2)O_(2)rarrSO_(3)""DeltaH=-98.2 kJ"...(ii)"`
eq. (ii) - (i) and FIND the required result.
Discussion
6168.

Which of the following is an example of zwitter ion ?

Answer»

Urea
Glycine HYDROCHLORIDE
AMMONIUM ACETATE
`ALPHA`-alanine.

Answer :D
Discussion
6169.

Which of the following reaction is used to decrease number carbon ?

Answer»

Hundsdicker reaction<BR>Wurtz reaction
Decarboxylation reaction
Riemer Tiemann reaction

Solution :`R-overset(O)overset(||)C-OAGoverset(Br_(2)//"CC"l_(4))toR-Br+AgBr+CO_(2)(uarr)`
`R-overset(O)overset(||)C-OHunderset(DELTA)overset("Soda LIME")tor-H+CaCO_(3)`
Discussion
6170.

When a small quantity of FeCl_(3) solution is added to the fresh precipitate of Fe(OH)_(3) , a colloidal sol is obtained. The process through which this sol is formed is known as

Answer»

EXCHANGE of SOLVENT
chemical double decomposition
peptization
electrophoresis

Solution :Peptization involves conversion of FRESHLY prepared precipitate into colloidal particles using a suitable ELECTROLYTE.
Discussion
6171.

Which one of the following is not a mixture?

Answer»

DISTILLED water
SUGAR DISSOLVED in water.
Liquefied Petroleum Gas (LPG).
Gasoline

Answer :A::B::C
Discussion
6172.

Which among the following reagent is not used to differentiate ethanol and phenol?

Answer»

neutral `FeCl_(3)`
`C_(6)H_(5)N_(2)Cl`
NaOH
anhy `ZnCl_(2)`

ANSWER :D
Discussion
6173.

What are enatiomers?

Answer»

Solution :The pair of two OPTICALLY active ISOMERS which are mirror images of each other are CALLED ENATIOMERS.
Discussion
6174.

What is the name of the following reaction?

Answer»

SOLUTION :FITTING REACTION.
Discussion
6175.

What are the factors which influence the adsorption of a gas on a solid ?

Answer»

Solution :Lack of gas : Gases like `NH_(3), HCl` which can easily liquified are adsorbed in more PROPORTION. While the permanent gases like `H_(2), O_(2), N,` etc. Which can not easily liquified are adsorbed in less proportion because `NH_(3) and HCl` has strong van der Waals. FORCES than `H_(2) and O_(2)` which helps to liquified easily.
Surface area of solid substance : As more the surface area of adsorbent as more gas is adsorbed on its surface.
The effect of temperature : Adsorption is a exothermic reaction. THUS, as per Le-Chatelier.s theory the adsorption decrease with the increase in temperature.
Effect of PRESSURE : Adsorption is a reversible PROCESS and its increases with the increase in pressure.
Discussion
6176.

Whichof the followingcompounds will givecarboxylicacid withnitrousacid (HNO_(2))?

Answer»

`R - COCL`
`R-CONH_(2)`
`R - COOR `
`(RCO)_(2)O`

Answer :B
Discussion
6177.

What is ''semi permeable membrane'' ?

Answer»

Solution :Continuous SHEETS or films (natural or synthetic) which contain a network of sub microscopic holes or pores through which small SOLVENT molecules like water can pass , but the PASSAGE of bigger molecules of solute is hindered, are known as semi permeable membrane. DIFFUSION TAKING place by this membrane is called Osmosis.
Discussion
6178.

The region in which metals are found in earth is called :

Answer»

Atmophile
Lithophile
Calcophile
Sidrophile

Answer :D
Discussion
6179.

which of the following salt does not get hydrolysed in water?

Answer»

`KClO_(4)`
`NH_(4)Cl`
`CH_(3)COONA`
NONE of these

Solution :Only salts of (WEAK acid + STRONG base) and strong acid + weak base) get hydrolysed
Discussion
6180.

To prepare butan-2-ol from methyl magnesium iodide. The compound required is

Answer»




ANSWER :B
Discussion
6181.

Which of the following names are correct for the compound? HOOC-CH_(2)-CH_(2)-overset(COOH)overset(|)(CH)-CH_(2)-CH_(2)-COOH.

Answer»

Pentane-1,3,5-tricarboxylic ACID
4-Carboxy heptane-1,7-dioic acid
Heptane-1,4,7-trioic acid
All are correct

Answer :a,B
Discussion
6182.

What is the advantage of heating a germanium semiconductor with silver or gold instead of indium or boron?

Answer»

Solution :DOPING with Ag or Au will create more HOLES LEADING to INCREASE in conductivity.
Discussion
6183.

Which of the following reactions is feasible for the preparation of propyl sec-butyl ether (I) ?

Answer»

Williamosn's SYNTHESIS with

Alkoxy mercuration-demercuration of

Alkoxy mercuration-demercration of Propene `+MeCH_(2)underset(Me)underset(|)CH-OH`
Intrmolecular dehydration of `MeCH_(2)CH(Me)OH` and `MeCH_(2)CH_(2)OH`.

SOLUTION :NA
Discussion
6184.

What are antibiotics ?

Answer»

Solution :A substance produced WHOLLY or PARTLY by chemical synthesis which in LOW concentration inhibits the growth or DESTROYS microorganism by INTERFERING with their metabolic processes.
Discussion
6185.

Which of the following process does not occur at the interface of phase ?

Answer»

carystallisation
HETEROGENOUS catalysis
HOMOGENEOUS catalysis
CORROSION

Solution :There is no INTERFACE in homogeneous catalysis.
Discussion
6186.

Which of the following combinations of atomic orbitals gives antibonding pi MO (assume z - axis as internuclear axis) ?

Answer»

1. `2s+2p_(Z)`
2. `2p_(y)+2p_(y)`
3. `2p_(X)-2p_(x)`
4. `2p_(z)-2p_(z)`

ANSWER :C
Discussion
6187.

Which is the correct is /are correcct :

Answer»

FINALTEMPERATURE in reversibleadiabaticexpansionis lesser thanin irreversible adiabaticexpansion .
When heat is SUPPLIED to an idealgas in isothermal process, KINETIC energy of gaswill increasase.
Whenan idealgas is subjectedto adiabaticexpansion it getscooled
ENTROPY increases inatomisation of dihydrgen

Solution :`W_("irr")gtW_("rev") ` with sign
`nC_(V) (T_("irr")-n T_(1))gt "NC"_("v")(T_("rev")-n T_(1))`
`T_("irr")gtT_("rev")`
Discussion
6188.

Which ligand produces a high crystal field splitting:

Answer»

`CO `
`NO_2^-`
`CN^-`
All are correct

Answer :D
Discussion
6189.

Transition elements act as good catalysts because

Answer»

Presence of PARTIALLY filled d-orbitals
Forms H-bonding EASILY
Transition elements show variable oxidation state
Easy INTER convertibility of oxidation states due to low oxidation aI~d reduction potential

Solution :Variable valancies due to d-block ELECTRONS
Discussion
6190.

Water softening by Clark.s process uses

Answer»

`NaHCO_(3)`
`Ca(OH)_(2)`
`Ca(HCO_(3))_(2)`
`Na_(2)CO_(3)`

Solution :Clark's PROCESS is a commercialmethod of WATER softening .
A calculatedamountof QUICK is added to hard water , bicarbonates are converted into insoluable calcium and magnisium carbonates which are filled off .
`CaO +H_(2)O to Ca(OH)_(2)`
`Ca(HCO_(3))_(2) +Ca(OH)_(2) to 2CaCO_(3) uarr +2H_(2)O `
Discussion
6191.

Which of the following compounds is metallic and ferromagentic ?

Answer»

`MnO_(2)`
`TiO_(2)`
`CrO_(2)`
`VO_(2)`

Solution :FERROMAGNETIC material are Fe, CO, NI, Gd, `CrO_(2)`
Discussion
6192.

Which one of the following is an INCORRECT statement for an electrochemical cell ?

Answer»

The oxidising and reducing agents should be seperated from each other.
A salt bridge containing the same electrolyte SOLUTION as present in oxidation half cell should be used to internally CONNECT the two half cells.
The cells stops working after some time.
The circuit is completed EXTERNALLY by CONNECTED a WIRE to the electrodes.

Answer :B
Discussion
6193.

The slat that is rare in minerals -

Answer»

chloride
sulphate
sulphide
nitrate

Answer :D
Discussion
6194.

What is the tautomer of phenol ? Which is more stable ?

Answer»

Solution :The TAUTOMER of PHENOL is cyclohexadienone. . This KETO form is UNSTABLE. Phenol is more stable because it is aromatic and EXISTS in 100% enol form.
Discussion
6195.

The work done in an open vessel at 300K, when 112 g iron reacts with dil HCl is:

Answer»

-1.2 kcal
0.6 kcal
-0.3 kcal
0.2 kcal

Answer :A
Discussion
6196.

Which is correct order property indicated :

Answer»

`LiH lt NaH lt KH lt RbH lt CsH` (Thermal stability)
`'BeCO_(3)lt MgCO_(3)lt CaCO_(3)lt SrCO_(3)` (Solubility)
`Na_(2)SO_(4)lt K_(2)SO_(4)lt Rb_(2)SO_(4)lt Cs_(2)SO_(4)` (Solubility)
(A) & (C ) both

Solution :
No any plane of symmetry, so mirror image non superimposable.
Discussion
6197.

What are the magnetic moment (in BM) for Ni(II) ion in square planar and octahedral geometry, respectrively?

Answer»

0 and 2.83
2.83 and 2.83
0 and 1.73
2.83 and 0

Solution :For SQUARE PLANAR
Discussion
6198.

Which of the following method is not meant for the synthesis of nitroalkane ?

Answer»

nitration of ALKANE
oxidation of OXIME
oxidation of `3^(@)` alkyl AMINE
REDUCTION of oxime

Solution :Reductionof oximeproduces`1^(@)`amines.
Discussion
6199.

Weight ratio of roasted on, coke and limestone fed into the blast mace in the manufacture of case iron is

Answer»

`8:1:4`
`6:4:1`
`8:4:1`
`8:4:3`

ANSWER :C
Discussion
6200.

triangleH for the reaction given below represents:CO_2(g)+H_2(g)rarrCO(g)+H_2O ,triangleH=40 kJ

Answer»

ENTHALPY of formation
Enthalpy of combustion
Enthalpy of neutralisation
Enthalpy of reaction

Answer :D
Discussion