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10201.

Which of the following is used for dehydration alcohol ?

Answer»

85% PHOSPHORIC ACID
75% Phosphoric acid
85% SULPHURIC acid
None of these

Solution : 85% Phosphoric acid
Discussion
10202.

Which of the following statement(s) is/are incorrect? (i).Trichlorides on hydrolysis in water form tetrahedral [M(OH)_(4)]^(-) species. (ii). Hybridisation state of metal in tetrahedral species is sp^(3). (iii).Aluminium chloride in acidified aqueous solution forms [Al(OH)_(4)]^(-) ion.

Answer»

(i) and (ii)
(ii) only
(iii) only
(i) and (iii)

Solution :Aluminium CHLORIDE in ACIDIFIED AQUEOUS solution forms octahedral `[Al(H_(2)O_(6)]^(3+)` ion
Discussion
10203.

Write the hybridisation and magnetic characters of the following complexes : [Ni(CO)_(4)] [Atomic number : Fe=26,Co=27,Ni=28]

Answer»

Solution :`[NI(CO)_(4)]`
HYBRIDISATION `=sp^(3)`
Magnetic character = DIAMAGNETIC
Discussion
10204.

Which of the following has least coagluating value for positive sol ?

Answer»

`CL^(-)`
`SO_(4)^(2-)`
`PO_(4)^(-3)`
`[Fe(CN)_(6)]^(-4)`

ANSWER :D
Discussion
10205.

The term order and molecularity are common in chemical kinetics. Write Arrhenius equation.

Answer»

SOLUTION :ARRHENIUS equation is k=`A bareE_a/(RT)`,where k is the rate CONSTANT,`E_a`is the ENERGY of activation
Discussion
10206.

Which of the amino acid is optically inactive ?

Answer»

Alanine
Valine
GLYCINE
PROLINE

ANSWER :C
Discussion
10207.

There are certain substances which behave as normal, strong electrolytes at low concentration but at higher concentration they behave as colloidal solution due to the formation of aggregated particles. Such colloids are called associated colloids and the aggregated particles are called micelles. Soaps anddetergents are the examples of associated colloids. The formation of micelles takes place above certain concentration called critical micellization concentration (CMC) and a characteristic temperature called Kraft temperature (T_k).  What type of molecules form micelles

Answer»

NON - polar MOLECULES 
ELECTROLYTES such as NaCl 
Surfactant molecules 
Salt of weak acid and weak BASE 

Solution :Surfactant molecules FORMS micelle
Discussion
10208.

There are certain substances which behave as normal, strong electrolytes at low concentration but at higher concentration they behave as colloidal solution due to the formation of aggregated particles. Such colloids are called associated colloids and the aggregated particles are called micelles. Soaps anddetergents are the examples of associated colloids. The formation of micelles takes place above certain concentration called critical micellization concentration (CMC) and a characteristic temperature called Kraft temperature (T_k).  Micelles are formed only

Answer»

below the CMC 
above the CMC 
above the 1M CONCENTRATION 
below IM Concentration 

Solution :Above the CMC MICELLES are FORMED.
Discussion
10209.

What is the difference between disinfectants and antiseptics? Can the same chemcial be used for both the pruposes?

Answer»

Solution :Chemical compounds are used for killing or preventing the growth of MICROORGANISMS. Compounds when APPLIED to LIVING tissues like wounds, CUTS, ULCERS and diseased skin surfaces are called antiseptics. However when applied to inanimate objects like floors and drainage systems, they are called disinfectants. Same chemical in low concentration may be used as antiseptic and in high concentration as disinfectants. 0.2% Phenol solution is antiseptic but 1% phenol solution is disinfectant.
Discussion
10210.

Write the conductivity order o f aluminium I phosphide, silicon and cadmium sulphide.

Answer»

Solution :At room temperature, conductivity will be more if the POLARITY of the COVALENT BOND is more. Si - Sibond is non-polar, AI - P bond is SLIGHTLY polar and Cd - S bond is more polar. Increasing order of conductivity : Silicon `lt` Aluminium phosphide `lt`Cadmium sulphide
Discussion
10211.

Which element disintegrates to give two noble guses

Answer»

RA
Th
Rn
He

ANSWER :A
Discussion
10212.

Which one of the following does not undergo friedel crafts reaction?

Answer»




SOLUTION :
Discussion
10213.

Which reaction process with increase in entropy?

Answer»

`CaCO_(2) to CaO + CO_(2)`
`FE + S to FeS`
`NAOH + HCl to NaCl + H_(2)O`
`CH_(4) + 2O_(2) to CO_(2) + H_(2)O`

ANSWER :A
Discussion
10214.

(X) + K_2CO_3 + Air overset(heat)rarr (Y) (Y)+Cl_2 rarr (Z) Pink which of the following is correct ?

Answer»

X back , `MnO_2`Y = BLUE, `K_2CrO_4,Z=KMnO_4`
X=green `Cr_2O_3` Y=yellow `K_2CrO_4, Z K_2CrO_7`
X=black ,`MnO_2` Y= green `K_2MnO_4, Z=KMnO_4`
X = black , `Bi_2O_3,`Y = COLOULESS `KBiO_2,Z = KBiO_2`

SOLUTION :`MnO_(2) + K_2CO_3 + "AIR" overset(Delta) rarr K_2MnO_4, K_2MnO_4 + Cl_2 rarr KMnO_4`
Discussion
10215.

What are dihydric phenols? Give three examples.

Answer»

Solution :When BENZENE RING has 2 -OH groups, it is CALLED Dihydric phenol.
Discussion
10216.

Why boiling pointsof phenols are higher than those of the corresponding aromatic hydrocarbons and alkyl halides?

Answer»

Solution :Due to INTERMOLECULAR H-bonding PHENOLS have higher boiling point than the corresponding aromatic hydrocarbons which have only WEAK van DER waals forces of attraction.
Discussion
10217.

Which of the following hybrid state is associated with low spin complex ?

Answer»

`sp^3`
`sp^3d^2`
`d^2sp^3`
`sp^3d`

ANSWER :C
Discussion
10218.

Which of the following is not an organometallic compound?

Answer»

`C_(6)H_(5)Ti(OC_(3)H_(7))_(3)`
`Ti(OC_(3)H_(7))_(4)`
`(C_(5)H_(5))_(2)Fe`
`(C_(2)H_(5))_(2)Zn`

ANSWER :B
Discussion
10219.

Which of the following is incorrect match

Answer»

STABILITY `H_2O gt H_2S gt H_2SeH_2Te`
BOND enthalpy : `H_2O gt H_2S gt H_2Se gt H_2Te`
Ka `H_2O gt H_2S gt H_2Se gt H_2Te`
`B.P : H_2S LT H_2Se lt H_2Te lt H_2O`

SOLUTION :`H_2O < H_2S < H_2Se < H_2Te`
Discussion
10220.

Which of the following in most acidic ?

Answer»

PHENOL
p-Cresol
Cyclohexanal
p-Nitrophenol

Answer :D
Discussion
10221.

When huge amount of sewage is dumped into a river, the BOD will

Answer»

Increase
Remain unchanged
Slightly decrease
Decrease

Solution :The degree of POLLUTION is DIRECTLY proportional to BOD, therefore more the organic pollution (SPECIALLY sewage), more would be BOD of water
Discussion
10222.

What is use of Ranitidine ?

Answer»

SOLUTION :It is USED as an ANTACID.
Discussion
10223.

What are d-block and f-block elements?

Answer»

Solution :In a PERIODIC table, the elements PERSENT in GROUP 3.12 in which the d-orbitals are progressibely filled in each of the four long periods are CALLED d-block elements. These elements are referred as transition elements
The elements in which the 4f and 5f-orbitals are successively filled are called f-block elements. The f-block elements are placed seperately at the bottom of the periodic table. These elements are referred as INNER transition elements.
Discussion
10224.

Various constituents of liquid possess different boiling points, So they can be separated by fractional distillation. It can be done by using claude's apparatus. When condensed air passed through Claude's apparatus, both oxygen and Nitrogen ger condensed separately. He and Ne are collected with liquid nitrogen. Ar, Kr, Xe are collected with liquid oxygen. After removal of N_2 by heating with CaC_2 He & Ne are cooled to 20 K with liquid H_2 After removal of O_2 with Cu, Ar, Kr, Xe are cooled with liquid nitrogen and Ar separated out. Finally liquid kr and Xe can be separated by fractional distillation : In this process the chemical that is not involved

Answer»

He, Xe
He, Ne
`Ar, O_2`
`N_2, O_2`

SOLUTION :`CaC_2+ N_2 overset(800- 1000^@C)to CaCN_2+ C_("graphite")`
`2CU + O_2 to 2CuO`
`{:(Ar to 87.28),(O_2 to 90.0):}}`NEARLY same VALUES
Discussion
10225.

Which of the following does not exist?

Answer»

`WO_(4)^(2-)`
`CrO_(4)^(2-)`
`VO_(4)^(3-)`
`[CuI_(4)]^(2-)`

Solution :`I^(-)` is good reducing agent and `Cu^(2+)` is good oxidizing agent
`2CU^(2+) + 4I^(-) RARR underset(("WHITE ppt"))(Cu_(2) I_(2))` + I_(2)`
Discussion
10226.

Vucanized rubber resists:

Answer»

WEAR and TEAR DUE to friction
Cryogenic temperature
High temperature
Action of acids

Answer :A
Discussion
10227.

The reagent with which both aldehyde and acetone ract easily is

Answer»

FEHLING's REAGENT
GRIGNARD reagent
SCHIFF's reagent
Tollen's reagent

ANSWER :B
Discussion
10228.

Which is the intensive property:

Answer»

Temperature
Viscosity
Density
All

Answer :D
Discussion
10229.

What is optical activity ? Which one of the following compounds shows optical isomerism ? Br-underset(CH_(3))underset(|)overset(H)overset(|)(C)-Br"" Br-underset(CH_(3))underset(|)overset(OH)overset(|)(C)-COOH

Answer»

SOLUTION :It is the property of a compound by which its solution can rotate the PLANE of plane polarized light.
will show OPTICAL isomerism.
`Br-underset(CH_(3))underset(|)overset(OH)overset(|)C-COOH`
will show optical isomerism.
Discussion
10230.

The reagent (s)for the followiingconversation

Answer»

alcoholicKOH
alcoholicKOHfollowedby `NaNH_(2)`
AQUEOUS KOH FOLLOWEDBY `NaNH_(2)`
`Zn//CH_(3)OH`

Answer :b
Discussion
10231.

Which of the following has been universally accepted as a reference electrode at all temperature and has been assigned a value of zero volt

Answer»

GRAPHITE electrode
Copper electrode
Platinum electrode
Standard HYDROGEN electrode

Answer :D
Discussion
10232.

The unit of ebulioscopic constanat is

Answer»

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

SOLUTION :is the correctanswer.
Discussion
10233.

Which of the following represents chloroprene , the monmer of neoprene ?

Answer»

`CH_(2)=CH-CH=CH_(2)Cl`
`CH_(2)=underset(CH_(3))underset(|)(C)-CH=CHCl`
`CH_(2)=underset(Cl)underset(|)(C)-CH=CH_(2)`
`CH_(2)=underset(CH_(3))underset(|)(C)-underset(Cl)underset(|)(C)=CH_(2)`

SOLUTION :`underset("CHLOROPRENE")(nCH_(2)=underset(Cl)underset(|)C-CH=CH_(2)) overset("POLYMERISATION")(to) underset("Neoprene")([--CH_(2)-C=CH-CH_(2)--]_(n))`
Discussion
10234.

Which of the following will most readily dehydrated in acidic conditions?

Answer»




ANSWER :A
Discussion
10235.

What is the basicity of H_(3)PO_(3) is heated?

Answer»

SOLUTION :`H_3PO_4` has THREE replacable HYDROGENS. Hence, its BASICITY is 3.
Discussion
10236.

When 3, 3-dimethyl 2-butanol is heated with H_2SO_4 the major product obtained is

Answer»

2, 3-dimethylbut-1-ene
3, 3-dimethylbut-1-ene
2, 3-dimethylbut -2-ene
cis and TRANS ISOMERS of 2, 3-dimethyl but-2-ene

Answer :C
Discussion
10237.

Which of the following is a branched polymer, having branched chain polysaccharide units ?

Answer»

STARCH
BAKELITE
HIGH DENSITY polyethylene
Nylon

Answer :A
Discussion
10238.

Which of the following undergoes decarboxylation most readily on being heated ?

Answer»




SOLUTION :
Discussion
10239.

Threeangular momentum of an electron in bohr 's orbit of hydrogen atom is 4.217 xx 10^(34) kgm^(2)S^(-1)what will be the wavelength emitted when this electron falls from this level to its next lower level

Answer»

a single atom
TWO ATOMS
THREE atoms
EITHER 2 or 3atoms

Answer :D
Discussion
10240.

Which is a primary alcohol ?

Answer»

Butan-2-ol
Butan-1-ol
Propan-2-ol
ISOPROPYL ALCOHOL

ANSWER :B
Discussion
10241.

The solubility of [Co(NH)_(3))_(4)Cl_(4)]CIO_(4)____if the lambda_(Co(NH_(3))_(4)Cl_(2)^(+)=50, lambda_(ClO_(4)^(-)=70 and the measured resistance was 35.5 Omega in a cell with cell constant of 0.20 is ____

Answer»

59.75 mmol/L
49.75 mmol/L
39.75 mmol/L
29.75 mmol/L

Solution :`lambda_([CO(NH_3)_4Cl_2]ClO_4)^@=lambda_([CO(NH_3)_4Cl_2^(-)])^@ .^(+LAMBDA^@)[ClO_4^(-)]=50+70=120`
`lambda_([CO(NH_3)_4Cl_2]ClO_4)=(1000 K)/M`
`K=G SIGMA`
=1/33.5x0.20
`lambda_([CO(NH_3)_4Cl_2]ClO_4)=120xx(1000xx0.20)/(33.5xxM)`
`M=(1000xx0.20)/(33.5xx120)=49.75` mmol/L
Discussion
10242.

Write the structures of main products when benzene diazonium chloride reacts with the following reagents: (i) CuCN"" (ii) CH_(3)CH_(2)OH"" (iii) Kl

Answer»

SOLUTION :
Discussion
10243.

Which one of the following does not give a precipitate with anexcess of aqueous NaOH solution ?

Answer»

`ZnSO_(4)`
`CuSO_(4)`
`FeSO_(4)`
`MnSO_(4)`

SOLUTION :`ZnSO_(4)` GIVES `ZN(OH)_(2)` and soluble in excess of NaOH to give `Na_(2)ZnO_(2)`
Discussion
10244.

What is true for Lamda_(m(NH_(4)OH))^(@) ?

Answer»

`Lamda_(m(NaOH))^(@)+Lamda_(m(NH_(4)Cl))^(@)-Lamda_(m(HCl))^(@)`
`Lamda_(m(NH_(4)Cl))^(@)+Lamda_(m(NaOH))^(@)-Lamda_(m(NACL))^(@)`
`Lamda_(m(NH_(4)Cl))^(@)+Lamda_(m(NaCl))^(@)-Lamda_(m(NaOH))^(@)`
`Lamda_(m(NH_(4)Cl))^(@)+Lamda_(m(NH_(4)Cl))^(@)-Lamda_(m(NaOH))^(@)`

Solution :(i) `Lamda_(m(NH_(4)Cl))^(@)=lamda_(m(NH_(4)^(+)))^(@)+lamda_(m(Cl^(-)))^(@)`
(ii) `Lamda_(m(NaOH))^(@)=lamda_(m(Na^(+)))^(@)+lamda_(m(OH^(-)))^(@)`
(iii) `Lamda_(m(NaCl))^(@)=lamda_(m(Na^(+)))^(@)+lamda_(m(Cl^(-)))^(@)`
`therefore (i)+(ii)-(iii)=lamda_(m(NH_(4)^(+)))^(@)+lamda_(m(OH^(-)))^(@)`
`=lamda_(m(NH_(4)Cl))^(@)`, so OPTION (B) is right.
So, if REPEAT accordingly, then option (A), (C) and (D) are wrong, as they are not the value of `Lamda_(m)^(@)(NH_(4)OH)`.
Discussion
10245.

The standard conditions for determination of standard emf of the cell are

Answer»

1M SOLUTION of the reactant
temperature of `25^(@)C`
both (a) and (B)
none of these

Answer :C
Discussion
10246.

Which of these is true ?

Answer»

Wave FUNCTION `(Psi)` does not have any physical signifiance
the probability of finding the electron at a pointwithin the ATOM is proportional to `Psi^(2)`
SCHRODINGER wave equationcannot be solved exactly for MULTI electron atoms
all ofthe above are correct

Answer :D
Discussion
10247.

The solubility of pure nitrogen gas at 25^(@)C and 1 atm 6.8xx10^(-4) mol/L. What is the concentration of nitrogen nitrogen dissoved in water under atmospheric condition ? The partial pressure of nitrogen gas in atmosphere is 0.78 atm.

Answer»


SOLUTION :Step I. Calculation OS Henny's LAW constant.
`"According toHenny's Law, C=K_(H)P`
`(6.8xx10^(-4)molL^(-1))=K_(H)(1 atm)`
`K_(H)=6.8xx10^(-4)molL^(-1)atm^(-1)`
Step II. Calculation of solubility of NITROGEN gas in water
`C=(6.8xx10^(-4)mol L^(-1) atm^(-1))xx(1 atm)`
`=5.3 xx 10^(-4)mol L^(-1)=5.3xx10^(-4)M`
Discussion
10248.

Which of the following is not an ionic halide ?

Answer»

`UF_(4)`
`PbCl_(2)`
`SnCl_(2)`
`UF_(6)`

Solution :`UF_6` has ESSENTIALLY covalent character. This is because small HIGHLY charged cations POLARISE the anions more efectively. For a metal with variable oxidation states, the halide with higher oxidation state of metal will be more covalent than the halide with lower oxidation of the metal. For example, `PbCl_6, SnCl_4 and UF_6`, are more covalent in nature than `PBCI_2, SnCl_2 and UF_4` respectively.
Discussion
10249.

When mango is placed in 1N HCl solution, it

Answer»

swells
shrinks
remains UNCHANGED
bursts

Solution :OSMOTIC pressure of 1N HCL is higher.
Discussion
10250.

What is the correct IUPAC name of the following compound ? CH_(3)(CH_(2))_(4)underset(CH_(3))underset(|)(CH)-underset((CH_(2))_(2)CH_(3))underset(|)overset(CH_(3))overset(|)(C)-CH_(2)CH_(3)

Answer»

3,4-Dimethyl-3-n-propylnonane
4,5-Dimethyl-4-ethyldecane
6,7-Dimethyl-7-n-propylnonane
6,7-Dimethyl-7-ethyldecane.

ANSWER :B
Discussion