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10451.

Write the possible isomers for the formula (i) C_2H_6O (ii) C_3H_8O

Answer»

SOLUTION :(i) `C_2H_6O`
`{:((a)CH_3-CH_2OH:"Ethanol"),((b)CH_3-O-CH_3:"METHOXY metahane"):}}{:("Functional "),("ISOMERISM "):}`
(ii) `C_3H_8O`
(a) `CH_3 - CH_2 - CH_2 OH` : Propan - 1 - ol
(b) `CH_3- underset(OH)underset(|)(CH) - CH_3`: Propan - 2- ol
(iii) `CH_3 - CH_2 -O - CH_3` :Methoxy ethane
(a) and (b) - Position isomerism
(a) and (C ) - Functional isomerism
Discussion
10452.

What are transition elements ? Write two characteristics of the transition elements.

Answer»

Solution :MIDDLE portion of the periodic table FLANKED by s- and p-block constitutes transition elements. These are the elements in which filling of electrons takes PLACE in the d-orbitals.
TWO characteristics :
1. They form coloured ions.
2. They form complex compounds.
Discussion
10453.

Which of the following gives acetylene on hydrolysis ?

Answer»

`Al_(2)(C_(2))_(3)`
`Mg_(2)C_(3)`
`B_(4)C`
`La_(4)C_(3)`

Solution :`Al_(2)(C_(2))_(3)+6H_(2)Orarr2Al(OH)_(3)+3C_(2)H_(2)" ",""Mg_(2)C_(3)+4H_(2)Orarr2Mg(OH)_(2)+CH_(3)-C equiv CH`
Discussion
10454.

Which one of the following reactions cannot occur ?

Answer»

`Cu+ ZnSO_4 RARR CuSO_4 + Zn DARR `
`Cu+ 2AgNO_3 rarr Cu(NO_3)_2+ 2Ag darr`
`Cu+FeSO_4 rarrr CuSO_4 + FE darr`
`3Ag + AuCl_3 rarr 3AgCl + Au darr`

Solution :`Cu^(+2)+ 2E^(-) rarr Cu, E^(@) = +ve` (feasible reaction)
Discussion
10455.

Which one of the following statement(s) is/are false ?

Answer»

Weak LIGANDS like `F^(-),Cl^(-)" and "OH^(-)` usually FORM low spin COMPLEXES.
Strong LIGAND like `CN^(-)" and "NO_(2)^(-)`, generally form high spin complexes.
`[FeF_(6)]^(3-)` is high spin complex
`[Ni(CO)_(4)]` is high spin complex

Solution :WFL form high spin, while, SFL form low spin complexes. `[Ni(CO)_(4)]` is DIAMAGNETIC.
Discussion
10456.

What is the formula of density (d) of unit cell ?

Answer»

Solution :`Density(d)=("Mass of UNIT CELL")/("VOLUME of unit cell")=(ZM)/(a^3N_A)`
Discussion
10457.

Which of the following is an example of zwitterion :

Answer»

Urea
Glycine hydrochloride
Ammonium ACETATE
`ALPHA`-ALANINE

ANSWER :D
Discussion
10458.

The standard reduction electrode potentials of the three electrodes P,Q and R are respectively -1.76V, 0.34V and 0.8V. Then

Answer»

Metal Q will displace the cation of P from its aqueous SOLUTION and deposit the metal P
Both metals Q and R will displace the cation of P from its aqueous solution and deposit the metal P
Metal R will displace the cation of P from its aqueous solution and deposit the metal R
Metal P will displae the cation of R from its aqueous solution and deposit the metal R

Solution :The metal having LOW STANDARD reduction potential will displace the metal from its SALT's solution which has higher value of standard reduction potential.
Discussion
10459.

What is the equilibrium expression for the reaction: P_4(s)+5O_2(g) hArr P_4O_10(s)

Answer»

`K = [O_2]^5`
`K_c =([P_4O_10])/(5[P_4][O_2])`
`K_c=([P_4O_10])/([P_4][O_2]^5)`
`K_c=1/([O_2]^5)`

ANSWER :D
Discussion
10460.

The scientific and technological process used for the extraction/isolation of the metal from its ore is called as metallurgy.Following information is given in columns. Column-I:Metal Column-II:Process desirable in metallurgy Column-III: Main reduction process involved in metallurgy Answer the following three questions by appropriately matching the information given in the three column of the above following table. For Ag the only correct combination is :

Answer»

(III)(iii)(R)
(III)(iv)(R)
(III)(i)(Q)
(III)(II)(S)

SOLUTION :NA
Discussion
10461.

Tollen's reagent is used for the detection of aldehyde. When a solution of AgNO_(3) is added to glucose with NH_(4)OH, then gluconic acid is formed. Ag^(+)toe^(-)toAg,E_(red)^(@)=0.8V C_(6)H_(12)O_(6)+H_(2)OtoC_(6)H_(12)O_(7) (Gluconic acid) +2H^(+)+2e^(-),E_(oxd)^(@)=-0.05V Ag(NH_(3))_(2)^(+)+e^(-)toAg(s)+2NH_(3),E^(@)=-0.337V [Use 2.303xx(RT)/(F)=0.0592 and (F)/(RT)=38.92 at 298K] Now answer the following three questions: Q. 2Ag^(+)+C_(6)H_(12)O_(6)+H_(2)Oto2Ag(s)+C_(6)H_(12)O_(7)+2H^(+) Find in K of this reaction:

Answer»

66.13
58.38
28.3
46.29

Solution :`2Ag^(+)+C_(6)H_(12)O_(6)+H_(2)TO2AG(s)+C_(6)H_(12)O_(7)+2H^(+),E^(@)=0.8-0.05=0.75"VOLT"`
`0=0.75-(0.0592)/92)LOGK`.
in `K=2.303xxlogK=2.303xx25.34=58.38`
Discussion
10462.

The scientific and technological process used for the extraction/isolation of the metal from its ore is called as metallurgy.Following information is given in columns. Column-I:Metal Column-II:Process desirable in metallurgy Column-III: Main reduction process involved in metallurgy Answer the following three questions by appropriately matching the information given in the three column of the above following table. For Cu the only incorrect combination is :

Answer»

(II)(i)(Q)
(II)(ii)(Q)
(II)(iii)(Q)
(II)(IV)(R)

Solution :NA
Discussion
10463.

The scientific and technological process used for the extraction/isolation of the metal from its ore is called as metallurgy.Following information is given in columns. Column-I:Metal Column-II:Process desirable in metallurgy Column-III: Main reduction process involved in metallurgy Answer the following three questions by appropriately matching the information given in the three column of the above following table. Select the only incorrect combination.

Answer»

(I)(II)(P)
(I)(IV)(P)
(IV)(ii)(S)
(IV)(iii)(S)

Solution :NA
Discussion
10464.

Tollen's reagent is used for the detection of aldehyde. When a solution of AgNO_(3) is added to glucose with NH_(4)OH, then gluconic acid is formed. Ag^(+)toe^(-)toAg,E_(red)^(@)=0.8V C_(6)H_(12)O_(6)+H_(2)OtoC_(6)H_(12)O_(7) (Gluconic acid) +2H^(+)+2e^(-),E_(oxd)^(@)=-0.05V Ag(NH_(3))_(2)^(+)+e^(-)toAg(s)+2NH_(3),E^(@)=-0.337V [Use 2.303xx(RT)/(F)=0.0592 and (F)/(RT)=38.92 at 298K] Now answer the following three questions: Q. When ammonia is added to the solution, pH is raised to 11. Which half-cell reaction is affected by pH and by how much:

Answer»

`E_(oxd)` will INCREASE by a FACTOR of 0.65 for `E_(oxd)^(@)`
`E_(oxd)` will decrease by a factor of 0.65 for `E_(oxd)^(@)`
`E_(RED)` will increase by a factor of 0.65 for `E_(red)^(@)`
`E_(red)` will decrease by a factor of 0.65 for `E_(red)^(@)`

SOLUTION :`[H^(+)]=10^(-11)M`
`E_("oxide")=-0.05-(0.591)/(2)log(10^(-11))^(2)=-0.05+0.65`
or `triangleH=0.65` volt.
Discussion
10465.

What are the different furnaces used for extraction of metals?

Answer»

SOLUTION : Different furnaces used for the extraction of metals are :
(1) Reverberatory FURNACE
(2) Bessemer converter
(3) Blast furnace
(4) HEARTH.
Discussion
10466.

Which possesses tetrahedral shape(sp^3-hybridisation of central atom):

Answer»

`[ZN(NH_3)_4]^(2+)`
`[Ni(CO)_4]`
`[Cd(NH_3)_4]^(2+)`
All are correct

Answer :D
Discussion
10467.

Which of the following is animal polysaccharide?

Answer»

Amylopectin
Glycogen
AMYLOSE
CELLULOSE

ANSWER :B
Discussion
10468.

To an acidicsolution of aniona few drops of acidified KMnO_(4) are added. Which one of the following anions , if present wil not decolourise the KMnO_(4) solutions ?

Answer»

`I^(-)`
`CO_(3)^(2-)`
`S^(2-)`
`NO_(2)^(-)`

SOLUTION :`I^(-), S^(2), NO_(2)^(-) and Cl^(-)` decolourise `KMnO_(4)` solution in acidic medium. The chemical equation are given below :
`2MnO_(4)^(-) + 16H^(+) + 10X^(-) to 2MN^(2+) + 8H_(2)O +M 5X_(2) (X^(-) = Cl^(-) , I^(-))`
`2MnO_(4)^(-) + 16H^(+) + 5S^(2-) to 2Mm^(2+) +8 H_(2)O + 5S`
`2MnO_(4)^(-) + 6H^(+)+ 5NO_(2)^(-) to 2Mn^(2+) + 3H_(2)O + 3H_(2)O + 5NO_(3)^(-)`
Discussion
10469.

Which of the following is ambidentate group ?

Answer»

`NH_(2)`
OH
`NO_(2)`
`OR`

SOLUTION :`NO_(2)` is ambidentatenucleophile becauseithas twoattackingcentre. It canattackon substancethrough nitrogenor OXYGEN.
Discussion
10470.

What is the role of zinc metal in the extraction of silver?

Answer»

SOLUTION :Zn ACTS as a reduction agent.
`2[AG(CN)_(2)]^(-) (AQ) +Zn (s) to Ag (s) +[Zn(CN)_(4)]^(2-) (aq)`.
Discussion
10471.

Which of the following is not formed as an inter mediate in the Reimer- Tiemann reaction between phenol and alkaline chloroform?

Answer»




`:C Cl_(2)^(2-)`

SOLUTION :DICHLOROCARBENE is a NEUTRAL species, not ionic.
Discussion
10472.

Which of the following is not correct for noble gas?

Answer»

Ar is used in ELECTRIC bulbs
KR is OBTAINED during radioactive disintegration
Half life of Rn is 3.8 days
Helium is used to produce LOW temperature

Solution :Rn is obtained not Kr
Discussion
10473.

The specific conductance of a 0.01 M solution of KCl is "0.0014 ohm"^(-1)" cm"^(-1) at 25^(@)C. Its equivalent conductance is ...............

Answer»

`14" "ohm^(-1)CM^(2)EQ^(-1)`
`140" "ohm^(-1)cm^(2)eq^(-1)`
`1.4" "ohm^(-1)cm^(2)eq^(-1)`
`0.40" "ohm^(-1)cm^(2)eq^(-1)`

Answer :B
Discussion
10474.

What productswould be formed when a nucleotide from DNA containing thymine is hydrolysed ?

Answer»

SOLUTION :Besides thymine , the TWO other PRODUCTS , are :2 deoxy-D-ribose and phosphoric ACID.
Discussion
10475.

Which of the following shows variation of bond energy (BE) of halogens

Answer»




ANSWER :A
Discussion
10476.

The specles that do not contain peroxlde lons are

Answer»

`PbO_(2)`
`H_(2)O_(2)`
`KO_(2)`
`BaO_(2)`

ANSWER :A::C
Discussion
10477.

What is the No. of isomers with pyridine nucleus possible for compounds having MFC_(7)H_(9)N?

Answer»


SOLUTION :
Discussion
10478.

Which of the following structures permits cis-trans isomerism ?

Answer»

`X_2C = CY_2`
`XYC = CZ_2`
`X_2C = CXY`
XYC=CXZ

Answer :D
Discussion
10479.

Which one of the following sets of monosaccharides forms sucrose

Answer»

`ALPHA`-D-Galactopyranose and `alpha`-D-Glucopyranose
`alpha`-D-Glucopyranose and `BETA`-D-fructofuranose
`beta`-D-Galactopyranose and `alpha`-D-fructofuranose
`alpha`-D-Glucopyranose and `beta`-D-fructopyranose

SOLUTION :SUCROSE is DISACCHARIDE of `alpha`-D-glucopyranose and `beta`-D-fructofuranose
Discussion
10480.

Which of the following is most reactive toward S_N Ar?

Answer»




ANSWER :D
Discussion
10481.

What are all the conditions are necessary form catenation?

Answer»

SOLUTION :Essential condition for catenation,
(i) the VALENCY of element is greater than or equal to TWO.
(ii) Element should have an ABILITY to bond with itself.
(iii) The self bondmust be as STRONG as its bodn with other elements.
(iv) Kinetic inertness of catenated compound towards other molecules.
Discussion
10482.

Which is not correctly matched?

Answer»


Solution :(b) SODIUM hydridotrimethoxoborate(III)
(C) BIS (henzoyl acetaonate)beryllium(II)
(d) Tetrachloroauric(III) acid.
Discussion
10483.

Which of the following substance can be used directly as fertilizer?

Answer»

`(NH_(4))_(2)SO_(4)`
`Ca_(3)(PO_(4))_(2)`
`Ca(H_(2)PO_(4))_(2)`
`CaCN_(2)+C`

Solution :`Ca_(3)(PO_(4))_(2)` : It is a TERTIARY phophate and not soluble in water hence it is of no use for plants.
Discussion
10484.

Three metals A B and C have work functions as 15.5eV, 24eV and 30.5 eV respectively. If the light of wavelength 500Å is incident of each metal, which of the following is correct?

Answer»

Electrons can be ejected from A and C only
Electrons can be ejected from A and B only
Electrons can be ejected from A,B and C
None of the above

Answer :B
Discussion
10485.

Which of the following acids acts as reducing agent :

Answer»

HOOC -- COOH
Tartaric ACID
FORMIC acid
All

Answer :B
Discussion
10486.

What current strength in amperes will be required to liberate 10 g of iodine from potassium iodide solution in one hour ?

Answer»

SOLUTION : `=(96,500)/(127)xx"10 COLUMB"`
LET the CURRENT strength be = I
Time in seconds `=1xx60xx60`
We KNOW that the quantity of electricity, Q, used is given by the expression
`Q=Ixx" time in seconds"`
Curernt strength, `I=(Q)/(t)=(96,500xx10)/(127xx60xx60)`
= 2.11 ampere.
Discussion
10487.

Write the electronic configurations of the elements with atomic numbers 61, 91, 101 and 109.

Answer»

Solution :Z = 61 (Promethium, PM), Electronic configuration : `[Xe]^(54)4f^(5)5d^(0)6S^(2)`.
Z = 91 (Protactium, Pa), Electronic configuration : `[RN]^(86)5f^(2)6d^(1)7s^(2)`.
Z = 101 (Mendelevium, Md), Electronic configuration : `[Rn]^(86)5f^(13)6d^(0)7s^(2)`
Z = 109 (Meitnerium, Mt), Electronic configuration : `[Rn]^(86)5f^(14)6d^(7)7s^(2)`.
Discussion
10488.

Two moles of acetic acid are heated with P_(2)O_(5). The product formed is

Answer»

ACETIC anhydride
2 MOLES of ETHYL alcohol
2 MOLE of methylcynide
Formic anhydride

Answer :A
Discussion
10489.

Which of the following is correct method of preparation of methyl fluoride?

Answer»

`CH_3Br+ AGF to `
`CH_3OH + HF to `
`CH_4 + F_2 to `
`CH_4 + HF to `

Solution :`CH_3 - Br + AgF to AgBr + CH_3 - F , ` These RXN is swarts RXn
Discussion
10490.

When ethyl acetate was hydrolysed in pressure of 0.1 N HCI, the rate constant was found to be 5.40 xx 10^(-5) sec^(-1).But when 0.1 N H_2SO_4 was used for hydrolysis, the rate constant was found to be 6.25 xx10^(-5)sec^(-1).Thus, it may be concluded that :

Answer»

`H_2SO_4`is STRONGER than HCI
`H_2SO_4`is weaker than HCL
`H_2SO_4` and HCl both have the same strength
the data are not sufficient to compare the strength of `H_2SO_4` and HCl

Solution :RELATIVE strength in favour of `H_2SO_4`
`=("rate CONSTANT of reaction catalysed by "H_2SO_4)/("rate constant of reaction catalysed by HCl")`
Discussion
10491.

Write main differences between the properties of white phosphorus and red phosphorus.

Answer»

Solution : DIFFERENCES between properties of white and RED PHOSPHORUS:
Discussion
10492.

Which compound will liberate CO_2 from NaHCO_3 solution :

Answer»

`CH_3CONH_2`
`CH_3NH_2`
`(CH_3)_4N^+OH^-`
`CH_3H^+H_3Cl^-`

ANSWER :D
Discussion
10493.

Whichforms maximu compunds with Xenon

Answer»

F
Cl
Br
I

Answer :A
Discussion
10494.

What is the correct combination for the reaction :

Answer»

(III)(iv)(S)
(III)(iv)(P)
(II)(iii)(S)
(II)(iii)(P)

Solution :
This is Wolff Kishner reduction, so base SENSITIVE GROUPS should not be PRESENT in the reactant
Discussion
10495.

Write suitable reagent used for the following conversion: CH_3-CH_2-OH rarr CH_3-CH_2-O-CH_2-CH_3

Answer»

SOLUTION :CON.`H_2SO_4//413K`
Discussion
10496.

Units of cell constant are :

Answer»

`OHM^(-1)CM^(-1)`
cm
`cm^(-1)`
`Ohm^(-1)` cm.

Answer :C
Discussion
10497.

Which of the following metals are extracted by hydrometallurgy?

Answer»

FE 
Au
Mg 
PB 

ANSWER :B
Discussion
10498.

Which of the following anion(s) is/are interferingradicate ?

Answer»

`BO_(3)^(3-)`
`F^(Θ)`
`PO_(4)^(3-)`
NONE of these

Answer :a,b,c
Discussion
10499.

Which of the following expression is not applicable on the hydrolysis equilibrium :CN^(-)H_(2)OrArrHCN+OH^(-)

Answer»

`K_(h)=(K_(w))/(K_(a(HCN)))`
`h=SQRT((K_(h))/(C))`
`PH=(1)/(2)pK_(a(HCN))`
` [H+] =sqrt((K_(w).K_(a))/(C))`

Answer :3
Discussion
10500.

Which of the following does not give Borax bead test ?

Answer»

CHROMIUM salt
ferrous salt
cobalt salt
sodium salt

Answer :D
Discussion