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8301.

The reduction of benzoyl chloride with H_(2)//Pd-BaSO_(4) produces

Answer»

BENZOICACID
BENZYL alcohol
BENZOYL SULPHATE
benzaldehyde.

Answer :D
Discussion
8302.

What is electro-refining ? Give one example.

Answer»

SOLUTION :Electro-refining : Principle - It is APPLIED for metals like CU, AL, Zn, Pb, SN, etc.
Discussion
8303.

What amount of KClO_3 is required to supply oxygen which is required for complete burning of 11.2 l of CO gas at NTP to CO_2.

Answer»


ANSWER :20.42 G
Discussion
8304.

When vapour of an alcohol are passed over hot reduced copper, it gives an alkene. The alcohol is

Answer»

Primary
Secondary
Tertiary
None of these

Answer :C
Discussion
8305.

Which of the following is Dobereiner traid :

Answer»

CL, BR, I
Zn, Cr, Na
Ne, Ar, K
B, C, Si

Answer :A
Discussion
8306.

Write the rate expression for the following reactions, assuming them as elementary reactions. (i) 3A+5B_(2)to4CD (ii) X_(2)+Y_(2)to2XY

Answer»

Solution :(i) `3A+5B_(2)to4CD`
Rate = `-1/3(DELTA[A])/(dt)=-1/5(Delta[B_(2)])/(dt)=+1/4(Delta[CD])/(dt)`
(II) `X_(2)+Y_(2)to2XY`
Rate = `-(Delta[X_(2)])/(dt)=-(Delta[Y_(2)])/(dt)=+1/2(Delta[XY])/(dt)`
Discussion
8307.

Which acts as refrigerant?

Answer»

`CF_(2)Cl_(2)`
`C Cl_(4)`
`CF_(4)`
`NH_(3)`

Answer :A::C::D
Discussion
8308.

When 2-bromo-2-methylbutane is heated with alcoholic KOH, the possible products are __________. (i) (CH_(3))_(2)=CHCH_(3) (ii) CH_(2)-underset(CH_(3))underset(|)C-CH_(2)CH_(3) (iii) (CH_(3))_(2)CH-CH=CH_(2)

Answer»

(i),(III)
(i),(II)
(ii),(iii)
(i),(ii),(iii)

ANSWER :B
Discussion
8309.

The total number of acyclic structural and optical isomers possible for a hydrocarbon of the molecular formula C_(7)H_(16) is:

Answer»

6
8
10
12

Answer :B
Discussion
8310.

The value of four quantum number for the last electron of atom of element 'X' are n=7, l=1,m=+1 and s=+1/2 or -1/2 and vlaue of spin magnetic momentum for element 'X' is zero element 'X' has two isotopes (I) ""_(Z)^(A)X and(II) ""_(Z)^(B)X. Q. The incorrect statement regarding element 'X' is:

Answer»

Element 'X' belongs to 18th group
NUMBER of unpaired electrons in element 'X' is zero
Atomic number of element 'X' is 118
X' is representative element

Solution :X. is nobel gas not representative element ACCORDING to Bohr.s CLASSIFICATION.
Discussion
8311.

Which one among the following metals is more reactive than hydrogen ?

Answer»

Mercury
COPPER
Silver
Tin

SOLUTION :ACCORDING to the reactivity basis metals are arranged with respect to the hydrogen in a series which is KNOWN as ELECTROCHEMICAL series. In this series metals which are more reactive than hydrogen are placed above hydrogen and those which are less reactive than hydrogen are placed below hydrogen . In this series , tin is present above hydrogen while all other given metals are placed below it . Hence , is more reactive than hydrogen.
Discussion
8312.

which among the following statement is incorrect regarding the product formed when two molecules of HBr add to ethyne?

Answer»

IUPAC NAME is 1,1-dibromomethene
it is a geminal dihalide
It is a POSITION isomer of 1,2-dibromomethene
It has a PLANER structure

Answer :D
Discussion
8313.

Write the names of reagents used to bring about the following transformations. (ii) CH_3COOH rarr CICH_2-COOH

Answer»


ANSWER :`(##ANE_PKE_CHE_XII_C12_E02_045_S01##)` HVZ REACTION, REAGENTS Cl/red PHOSPHORUS
Discussion
8314.

Which type of 'defect' has the presence of cations in the interstitial sites?

Answer»

METAL DEFICIENCY defect
Schottky defect
Vacancy defect
Frenkel defect

Answer :D
Discussion
8315.

Write the valency shell electronic configuration of VIIA elements.

Answer»

SOLUTION :`ns^2np^5` where N is LAST ORBIT.
Discussion
8316.

Which of the statements is wrong

Answer»

All primary AMINES are BASIC
Aliphatic amines are more basic than ammonia
Aliphatic amines are less hasic than AROMATIC amines
All aromatic amines are basic

Solution :Resononce `uarr` b.c `DARR`
Discussion
8317.

The sum of primary valance and secondary valance of the metal M in the complex [M(en)_(2)(Ox)]Cl is …………….. .

Answer»

`3`
`6`
`-3`
`9`

ANSWER :D
Discussion
8318.

Which of the following exhibits tautomerism ?

Answer»

`(CH_3)CNO`
`R_3CNO_2`
`(CH_3)_2NH`
`RCH_2NO_2`

ANSWER :D
Discussion
8319.

Which is not an interstitial compound

Answer»

TIN
`Fe_(2)O_3`
`Mn_(2)C_(3)`
`W_(2)C`

Solution :`Fe_2O_3` FORMED by balancing its valancies
Discussion
8320.

What are alloys? Name an important alloy which contains some of the lanthanoid metals. Mention its uses.

Answer»

SOLUTION :An alloy is a blend of metals prepared by mixing the component metals to form homogeneous solid solution. In alloys the atoms of one metal are distributed randomly among the atoms of other.
Misch metal is an alloy that has 95% lanthanoid metals, 5% iron and trances of S,C, CA and Al. It is USED in Mg-based alloy to produce bullet shell and higher flint.
Discussion
8321.

Write IUPAC names of the following compounds :

Answer»

SOLUTION :
Discussion
8322.

What Hoff's facdstor for a solution is less than one. What is the conclusion of K_(2)SO_(4) ?

Answer»

Solution :`K_(2)SO_(4)` being a STRONG electrolyte completely DISSOCIATES in awueous solution i.e. `alpha=1`
`K_(2)SO_(4)overset(("AQ"))to2K^(+)(aq)+SO_(4)^(2-)(aq)`
`alpha=(i-1)/(n-1)or 1=(i-1)/(3-1)or i=2+1=3`
Discussion
8323.

Which of the following reactions can be used to prepare metaphosphoric acid ?

Answer»

<P>`P_(4)O_(6)+H_(2)O overset(Delta)to`
`H_(3)PO_(4) overset(600K)to`
`P+HNO_(3) ("conc")`
`P_(4)P_(10) to`

Answer :A
Discussion
8324.

Which of the following is not true with respect to Ellingham diagram?

Answer»

FREE emergy changes follow a straight LINE.Deviation occurs when there is a phase change.
The graph for the formation of `CO_(2)` is a straight line almost parallel to free enery axis.
Negative slope of CO SHOWS that it becomes morestable with INCREASE in temprature.
Positive slopw of metal oxides shows that their STABILITIES decrease with increase on temprature.

Answer :B
Discussion
8325.

Whichis the productformed whenfructoseundergoes partial reduction withsodium amalgam and water ?

Answer»

SORBITAL + MANNITOL
D - MANNOSE+ D- galactose
Gluconic ACID +saccharic acid
Aldehyde +ketone

Answer :A
Discussion
8326.

Which of the following compounds will exhibit geometrical isomersim-

Answer»

2 - phenyl - 1 - BUTENE
1,1 - diphenyl - 1 - propene
1 - phenyl - 2 - butene
3 - phenyl - 1 - butene

Solution :Alkenes with molecular formulas `C_(ab)=C_(ab),C_(ab)=C_(ac)&C_(ab)=C_(DE)` show geometrical isomerism.
So, 1 - phenyl - 2 -butene will show geometrical isomerism.
Discussion
8327.

Which of the following statements is correctabout[Y] ?

Answer»

[Y] is CONVERTED to metal (M) by selfreduction .
CARBONATE EXTRACT of [Y] givesyellowprecipiatewith suspension of `CdCO_(3)`
[Y]is chalcocites or chalcopyrites
All of these

Answer :a
Discussion
8328.

The reverse of fusion is freezing and it is:

Answer»

Endothermic
EXOTHERMIC
Neither exothermic nor endothermic
May be exothermic or endothermic

Answer :B
Discussion
8329.

Write the structure of the following compound : 2-(2-Chlorophenyl ) -1- iodooctane .

Answer»

SOLUTION :
Discussion
8330.

The value of four quantum number for the last electron of atom of element 'X' are n=7, l=1,m=+1 and s=+1/2 or -1/2 and value of spin magnetic momentum for element 'X' is zero element 'X' has two isotopes (I) ""_(Z)^(A)X and(II) ""_(Z)^(B)X. Q. The value of A and B respectively are:

Answer»

118 and 136
218 and 236
236 and 254
226 and 244

Solution :`Z=118, B-2Z=18,` so B=254
and `B-A=18` so A=236
Discussion
8331.

The value of four quantum number for the last electron of atom of element 'X' are n=7, l=1,m=+1 and s=+1/2 or -1/2 and vlaue of spin magnetic momentum for element 'X' is zero element 'X' has two isotopes (I) ""_(Z)^(A)X and(II) ""_(Z)^(B)X. Q. The possible value of all four quantum numbers for 90th electron of atom of element 'X' is:

Answer»

`{:(n,l,m,s),(6,2,0,-1//2):}`
`{:(n,l,m,s),(5,2,-1,+1//2):}`
`{:(n,l,m,s),(6,0,0,+1//2):}`
`{:(n,l,m,s),(5,3,-2,-1//2):}`

SOLUTION :90th `E^(-)` goes to 5f SUBSHELL to POSSIBLE four QUANTUMNUMBER are 5,3,-2 and -1/2 or +1/2.
Discussion
8332.

The reagant whichdoes notreactwith (C_(2)H_(5))_(3)Nis /are .

Answer»

`CH_(3)COCL`
`(CH_(3)CO)_(2)O`
NaOH
All of these

ANSWER :D
Discussion
8333.

Whichof the following reagents reactsdifferently with HCHO, CH_(3)CHO andCH_(3)COCH ?

Answer»

HCN
`NH_(2)NH_(2)`
`NH_(2)OH`
`NH_(3)`

SOLUTION :N/A
Discussion
8334.

Write the sructure and IUPAC names of all the metamers represented by formulaC_(4)H_(10)O Write balanced chemical equations for action of ammonia on : (a) Formaldehyde(b) Acetaldehyde (c) Acetone

Answer»

Solution :There are three METAMERS REPRESENTED by the formula `C_(4)H_(10)O`
(a) `C_(2)H_(5)-O-C_(2)H_(5)` : ethoxyethane
(b) `H_(3)C-O-CH_(2)-CH_(2)-CH_(3)` : 1-methoxy propane
Discussion
8335.

While giving labelled diagram of dry cell write reactions taking place at cathode and anode.

Answer»

Solution :PRIMARY cells arethosein whichthe electrodereactionscannotbereversed by anexternalelectricenergysource. Inthesecells, thereactionoccursonlyarenotchargeable .
(a)Drycell . Thedry cell wasinvented by G.leclanche.It CONSISTS of zinccylinder. thisis filledwitha paste of `NH_4 Cl`and littleof `ZnCl_2` in theformofpastein water. thezinccylinderactsas anodethecathodeiscarbonrod . thecarbonrodis SURROUNDEDBY a blackpasteof magneticdioxide`(MnO_2)` andcarbonpowder
whenthe cellis openatingzincloseselectrons and`Zn^(2+)`ionsdissolvein theelectrolyte . theelectron passaroundthe external circuitand are takenup atcathodethis causesdischargecircuit and aretakenupat cathodethis causesdischargeof `NH_(4)^(+)` ionsfromthe ELECTRONLYTE
the reactionoccrringat theelectronsare givenbelow
Atanode
` Zntozn^(2+)+ 2E^(-)`
atcathode
`2NH_4^(+)(AQ)+ 2MnO_2(s)+2e^(-)to Mn_2 O_3(s)+NH_3 +H_2 O`
it givesa voltageof about1.5 V
(b )uses. thedrycellsareused intorches , toysflash lighterscalculators, tape - recorders and inmanyotherdevices .
Discussion
8336.

Which of the following is maximum basic ?

Answer»

`CH_3CH_2-CH_2-CH_2-OH`
`(CH_3)_2CH-CH_2-OH`
`CH_3CHOHC_2H_5`
`(CH_3)_3C-OH`

ANSWER :D
Discussion
8337.

Which of the following is carbamide :

Answer»

`CH_3CONH_2`
`NH_2CONH_2`
`CH_2(NH_2)CONH_2`
`CO(OH)NH_2`

ANSWER :B
Discussion
8338.

Two substances P_(4) &O_(2) are allowed to react completely to form mixture of P_(4)O_(6) &P_(4)O_(10) leaving none of the reactants .Using this information calculate the moles of P_(4)O_(6) and P_(4)H_(10) in the final mixture when the following amounts of P_(4) & O_(2) are taken. P_(4) + 3O_(2) to P_(4)O_(6) P_(4) + 5O_(2) to P_(4)O_(10) (i) If 1 mole P_(4) & 4 mole of O_(2) (ii) If 3 mole P_(4) & 11 mole of O_(2) (iii) If 3 mole P_(4) & 13 mole of O_(2)

Answer»


ANSWER :`(i)0.5,0.5;(II)2,1(III)1,2`
Discussion
8339.

What are the raw materials required for the manufacture of Nylon 6, 6?

Answer»

CAPROLACTAM + hydrazine
ADIPIC acid + HEXA methylene diamine
methanal + ammonia
phenol + methanal

SOLUTION :adipic acid + hexa methylene diamine
Discussion
8340.

Two moles of PCl_(5)were introduced in a 2L, flask and heated at 600 K to attain the equilibrium, PCl_(5) was found to be 40% dissociated into PCl_(3)and Cl_(2).K_(c ) for the reaction is :

Answer»

`2.67xx10^(4)`
`2.67xx10^(-1)`
`2.67xx10^(-3)`
`2.67xx10^(-2)`

ANSWER :B
Discussion
8341.

What do we call a mixture containing two enantiomers in equal proportions ?

Answer»

SOLUTION :RACEMIC
Discussion
8342.

Which reagent would you use for the following reaction ? CH_(3)CH_(2)CH_(2)CH_(3) to CH_(3)CH_(2)CH_(2)Cl + CH_(3)CH_(2)CHClCH_(3)

Answer»

`Cl_(2)//UV ` light
`NaCl + H_(2)SO_(4)`
`Cl_(2)` GAS in DARK
`Cl_(2)` gas in the presence of iron in dark

Answer :a
Discussion
8343.

Which polymer among the following polymers does NOT soften on heating?

Answer»

BAKELITE
Polythene
POLYSTYRENE
PVC

Solution :It is THERMOSETTING POLYMER which is hard on heating.
Discussion
8344.

Which of the following Fisher projection formula is identical to D-glyceraldehyde ?

Answer»




SOLUTION :
Discussion
8345.

What happens when ozone reacts with KI solution?

Answer»

SOLUTION :`I_2` is EVOLVED.
`2KI + O_3 + H_2O RARR 2KOH + O_2 + I_2`
Discussion
8346.

Which of the following is true for the association of solute ?

Answer»

OBSERVED molecular mass `GT` Calculate molar mass
Observedosmotic pressure `gt` THEORETICAL osmotic pressure
Observed ELEVATION in boiling point `gt` Theoretical elevation in boiling point
Observed DEPRESSION in freezing point `gt` Theoretical depression in freezing point

Answer :A
Discussion
8347.

What is the sructure of 7-Bromo-5-hydroxy bicyclo [4.2.0.] octane-2-caboxylic acid.

Answer»




ANSWER :C
Discussion
8348.

'The volume of '10 Vol' of 'H_2O_2 required to liberated 500 mL O_(2) at NTP is:'

Answer»

50 mL
25 mL
100 mL
125 mL

Answer :A
Discussion
8349.

Water is said to be permancutly hard when it contains

Answer»

chlorides and sulphates of MG and CA
bicarbonates of Na and K
carbonates of Na and K
phosphates of Na and K.

Solution :Chlorides and sulphates of Ca and Mg cause PERMANENT hardness to water.
Discussion
8350.

Which of the following is the reaction half- reaction for a storage battery ?

Answer»

`PbO_(2 (s))+ SO_(4)^(2-) + 4 H^(+) + 2e^(-)to PbSO_(4 (s)) + 2 H_(2)O`
`Pb_((s)) + PbO_(2 (s)) + 2 H_(2)SO_(4) to 2 PB SO_(4 (s)) + 2 H_(2)O`
`Pb_((s)) + H_(2)SO_(4) to PbSO_(4 (s)) + 2 H^(+) + 2e^(-)`
`2 PbSO_(4 (s)) + 2 H_(2)O to Pb_((s)) + PbO_(2(s)) + 2 H_(2)SO_(4)`

Solution :Reduction half- cell reaction .
`PbO_(2 (S))+ 4H^(+) + SO_(4)^(2-) +2 E^(-) to PbSO_(4 (S)) + 2 H_(2)O`
OXIDATION half -cell reaction .
`Pb_((S)) + SO_(4)^(2-) + 2 e^(-)`
Discussion