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16001.

Which of the following is ferrous alloy?

Answer»

GERMAN Silver
Gun metal
NICHROME
Devarda's alloy

Solution :Nichrome
Discussion
16002.

What happens when diethyl ether reacts with following reagents. (i) axcess O_2(ii) Cl_2//light(iii) PCl_5 (iv) dil. H_2SO_4 //H_2O (v) CH_2COCl/Anhydrous ZnCl_2.

Answer»

Solution :Auto-oxidation :
(i) `CH_3-CH_2-O CH_2-CH_3 underset("slow")overset(excessO_2)to underset(("1-ethoxy ETHYL hydroperoxide"))(CH_3 - CH_2 -O- overset(""O-OH)overset(|)(CH)-CH_3)+ underset(("Diethyl peroxide"))(CH_3-CH_2 - O - O - CH_2 - CH_3)`
(II) `CH_3 - CH_2- O - CH_2 - CH_3underset("light")overset(10Cl_2)to underset("PERCHLORO ether")(C Cl_3 C Cl_2-O) - C Cl_2 -C Cl_3 + 10 HCL`
(iii) `CH_3 - CH_2 - O - CH_2 - CH_3 overset(PCl_5)to underset("Chloroethane")(2CH_3 - CH_2Cl) + POCl_3`
(iv) `CH_3 - CH_2 - O - CH_2 - CH_3 underset(H_2O)overset(dil. H_2SO_4)to underset("Ethanol")(2CH_3 - CH_2OH)`
(V) `CH_3-CH_2 - O - CH_2 - CH_3 underset("Anhydrous "ZnCl_2) overset(CH_3COCl) to underset("Chloroethane")(CH_3 - CH_2Cl) + underset("Ethy ethanoate")(CH_3COOCH_2CH_3)`
Discussion
16003.

What are the monomers of terylene ?

Answer»

SOLUTION :Terephthalic ACID and ETHYLENE GLYCOL.
Discussion
16004.

White phosporus is a tetra-atomic solid P_(4)(s) at room temperature. Find average (P-P) bond enthalpy in kJ/mol. {:("Given :",DeltaH_("sublimation")" of "P_(4)(s)=59" kJ/mol"),(,DeltaH_("atomisation")" of "P_(4)(s)=1265" kJ/mol"):}

Answer»

SOLUTION :`(P-P)=(1265-59)/(6)=201`
Discussion
16005.

The tetrahedral [CoI_(4)]^(2-) and square planar [PdBr_(4)]^(2-) complex ions are respectively :

Answer»

LOW SPIN, HIGH spin
high spin, low spin
both low spin
both high spin

Answer :B
Discussion
16006.

What is the formula of the oxide formed on burning potassium in oxygen ?

Answer»

`K_(2)O`
`K_(2)O_(2)`
`KO_(2)`
`K_(4)O_(2)`

Answer :C
Discussion
16007.

Which one of the following arrangements represents the correct order of electron gain enthalpy (with negative sign) of the given atomic species ?

Answer»

F lt CI lt O lt S
S lt O lt CI lt F
O lt S lt F lt CI
CI lt F lt S lt O

Solution :The electron gain enthalpy of CL is more negative than that of F and that of S is more negative than O. THEREFORE, the OVERALL correct gain enthalpy (with negative sign) is :
`O(-141 kJ MOL^(-1))lt S(-200 kJ mol^(-1))lt F(-328kJ mol^(-1))lt Cl(-349 kJ mol^(-1))`
Discussion
16008.

What is meant by chirality of molecules ?

Answer»

Solution :The MOLECULE which does not have any element of symmetry is CALLED CHIRAL molecule. This property is called chirality of molecule.
Discussion
16009.

Zinc blende (an ore ) is

Answer»

ZNO
`ZnCO_3`
ZNS
`Zn_2OCl_2`

ANSWER :C
Discussion
16010.

Write the generalelectronic configuration of lanthanoids.

Answer»

Solution :`[XE] 4F^(1-14) 45D^(0-1) 6s^(2)`
Discussion
16011.

What are the oxidation number of nitrogen in (a) HCl, (b) NaH, (c) H_(2)O_(2) and (d) PdH

Answer»


ANSWER :(a) +1, (B) -1, (C) +1, (d) = 0
Discussion
16012.

Which of the following has R configuration ?

Answer»




ANSWER :B
Discussion
16013.

Which forms most stable hydrate :

Answer»

`CH_3CHO`
`C_6H_5CHO`
`C Cl_3CHO`
`CH_3COCH_3`

ANSWER :C
Discussion
16014.

What is the pH value of 1 M H_(2)SO_(4)

Answer»

0
`-0.213`
`-2`
`-0.3010`

Solution :`1M H_(2)SO_(4) = 2N H_(2)SO_(4)`
`[H^(+)] = N. ALPHA = 2 xx 1 = 2`
`pH = -LOG[H^(+)] = -log 2 = -0.3010`.
Discussion
16015.

What is the state of hybridisation of Xe in cationic part of solid XeF_6

Answer»

`SP^(3)d^(3)`
`sp^(3)d^(2)`
`sp^(3)d`
`sp^(3)`

ANSWER :B
Discussion
16016.

Which of the following statements for the reaction, is correct ? Na_2CrO_4+H_2SO_4 to

Answer»

It is REDOX reaction inwhich green solution of `[Cr(H_2O)_6]^(+3)`is produced.
One of the product in reaction has TRIGONAL planar structure.
Dimeric bridged tetrahedral METAL ion is produced.
Dark blue COLOUR is obtained in reaction.

Solution :`underset("(Yellow)")(2CrO_4^(2-))underset(OH^(-))overset(2H^(+))hArrunderset("(Orange)")(Cr_2O_7^(2-))+H_2O`
Discussion
16017.

Which of the following statement is not correct for above elements ?

Answer»

P is the metal which form HALIDE of the formula MX
S is the less REACTIVE non metal
T is the least reactive element
Q is a non-metal and does not form BINARY halide of the formula `MX_(2)`

Answer :D
Discussion
16018.

The stratospheric ozone depletion leads to

Answer»

Forest FIRES
INCREASE in the INCIDENCE of SKIN cancers
Global warming
All of the above

Answer :D
Discussion
16019.

What causes nitrogen to be chemically inert ? 1) Multiple bond formation 2) Absence of bond polarity 3) Short internuclear distance4) High bond energy

Answer»

MULTIPLE BOND formation
Absence of bond polarity
SHORT internuclear distance
HIGH bond energy

Answer :A
Discussion
16020.

Which of the following is used during the preparation of Fluorine by Whyt law Gray's method ?

Answer»

AQUEOUS KF
aqueous HF
molten `KHF_(2)`
`NH_(4)F`

Answer :C
Discussion
16021.

What type of stoichiometric defect is shown by AgCl ?

Answer»

SOLUTION :FRENKEL DEFECT is SHOWN by AGCL.
Discussion
16022.

Which metal cation forms stronger complex salt ?

Answer»

`ZN^(2+)`
`CD^(2+)`
`HG^(2+)`
All of same strength

Answer :C
Discussion
16023.

Write the sturctures of the following compounds: a. Adjacent tribromobenzene b. Unsymmetrical trimethyl benzene c. Symmetrical triethyl benzene

Answer»

SOLUTION :IN a tribstitude BENZENE, adjacent is `1,2,3` position, unsymmetrical is `1,2,4-` positon and symmetrical is `1,3,5` position.
a.
B.
c.
Discussion
16024.

Which one of the following is used in the preparation of medicine like aspirin and phenacetin?

Answer»

ACETYL chloride
ACETIC ACID
Acetamide
Acetic ANHYDRIDE

Solution :Acetic anhydride
Discussion
16025.

The unit of electrochemical equivalent is :

Answer»

gram
gram/ampere
gram/coulomb
coulomb gram

Answer :C
Discussion
16026.

[Ti(H_(2)O)_(6)]^(3+) complex ion has purple colour due to absorption of "…............" coloured light and causingtransition from "…......." to "…............."orbitals.

Answer»


ANSWER :YELLOW,`t_(2G) ` to `e_(G)`
Discussion
16027.

Write the structures of the major products expected from the following reactions: (a) Mononitration of 3-methylphenol (b) Dinitration of 3-methylphenol (c) Mononitration of phenyl methanoate.

Answer»

SOLUTION :The combined influence of -OH and `-CH_(3)` GROUPS DETERMINE the position of the incoming group.
Discussion
16028.

The relationship between standard free energy change and equilibrium constant is expressed as ……………… .

Answer»

`Delta G^@ = -RT lnk_(EQ)`
`DELTAG = RTlnk_(eq)`
`Delta G^(@)= 1/(RT ln k_(eq))`
`DeltaG = RTlog_(eq)`

Answer :A
Discussion
16029.

The red-brown precipitate formed in step A contains

Answer»

`Hg_(2)[Fe(CN)_(6)`
`Cd_(2)[Fe(CN)_(6)]`
`Cu_(2)[Fe(CN)_(6)]`
`Pb_(2)[Fe(CN)_(6)]`

Solution :C) Red PRECIPITATE due to `Cu_(2)[Fe(CN)_(6)]`
Discussion
16030.

Total number of voids in 0.5 mole of a compound forming hexagonal closed packed structure are

Answer»

`60.22xx10^(23)`
`3.011xx10^(23)`
`9.034xx10^(23)`
`4.516xx10^(23)`

Solution :Number of CLOSE PACKED PARTICLES
`=0.5xx6.023xx10^(23)`
`:.` Number of octahedral voids `=3.0115xx10^(23)`
Number of tetrahedral voids `=2xx3.0115xx10^(23)`
`=6.023xx10^(23)`
THEREFORE total no of void `=6.023xx10^(23)+3.015xx10^(23)`
`=9.0345xx10^(23)`
Discussion
16031.

Volume of CO_(2) obtained at STP by the complete decomposition of 9.85g BaCO_(3) is (At wt of Ba = 137 )

Answer»

2.24 lt.
1.12 lt.
1.135 lt.
2.27 lt.

Answer :C
Discussion
16032.

When H_(2)S gas is passed in a metal sulphate solution in presence of NH_(4)OH, a white precipitate is produced. The metal is identified as

Answer»

Zn
Fe
Pb
Hg

Solution :Zinc is that metal, which GIVES white precipitate when `H_(2)S` gas is PASSED in the ammoniacal solution of its SALT.
Discussion
16033.

Under which of the following conditions attractive forces will be considerably high.

Answer»

If a gas is COMPRESSED to a very small volume at moderate temperature.
If temperature of gas is DECREASED at constant volume.
At very LOW pressure and high temperature
If a gas is EXPANDED to a high volume at moderate temperature.

Solution :Theory based
Discussion
16034.

Which metals forms amide with NH_(3) at 300^(@)C

Answer»

Mg
Pb
Al
Na

Solution :`2Na+2NH_(3) OVERSET("HEAT")to 2NaNH_(2) +H_(2)`
Discussion
16035.

The solubility product (K_(sp)) of the salts of types MX,MX_(2)andM_(3)X at temperature 'T' are 4.0xx10^(-8),3.2xx10^(-14)and2.7xx10^(-15) respectively. Solubilities (mol dm^(-3)) of the salts at temperature 'T' are in the order

Answer»

`MXgtMX_(2)gtM_(3)X`
`M_(3)XgtMX_(2)gtMX`
`MX_(2)gtM_(3)XgtMX`
`MXgtM_(3)XgtMX_(2)`

ANSWER :D
Discussion
16036.

Which of the following reagents can be used to prepare alkylhalide from an alcohol

Answer»

`NaCl`
`SOCl_2`
`PCl_5`
`HCl + ZnCl_2`

SOLUTION :`R - OH + SOCl_2 to R - Cl + SO_2 + HCl, R - OH + PCl_5 to R - Cl + POCL + HCl`
` R - OH + HCl OVERSET(ZnCl_2)(to)R - Cl + H_2O`
Discussion
16037.

Which acid is optically active:

Answer»

Propionic ACID
2-Chloropropionic acid
3-chloropropionic acid
Acetic acid

ANSWER :B
Discussion
16038.

Which of the following statements is(are) correct?

Answer»

The hydrides of group 15 electrons act as oxidizing AGENT.
The hydrides of group 15 elements ACTS as REDUCING agent.
The oxidizing power increases in going from `NH_(3)` to `BiH_(3)`
The reducing power increases in going from `NH_(3)` to `BiH_(3)`

ANSWER :B::D
Discussion
16039.

Which of the following structure represents terylene ?

Answer»

`(-underset(O)underset(||)C-NH-(CH_2)_5-)_n`
`(-CH_2-CH=CH-CH_2-underset(C_6H_5)underset(|)(CH)-CH_2-)_n`
`(-OCH_2-CH_2-O-underset(O)underset(||)C-C_6H_4-overset(O)overset(||)C-)_n`
`(-NH-(CH_2)_6-NH-CO-(CH_2)_4CO-)_n`

ANSWER :C
Discussion
16040.

Which of the following representation is not correct for the change below? (Consider all substances at 0k are perfect crystals) {:(pA + qB,overset(Delta_(r )S_(1)^(9))rarr,underset((298K))(rC= sD)),(darr Delta_(r )S_(4),overset(Delta_(r )S_(3))rarr,uarr Delta_(r)S_(2)),(underset((0K))(pA + qB),,underset((0K))(rC=sD)):}

Answer»

`Delta_(R)s_(1)^(0) = (rs_(C)^(0) + sS_(D)^(0)) - (ps_(A)^(0) + qs_(B)^(0))`
`Delta_(r ) s_(3) = 0`
`Delta_(r) s_(2) = -(rs_(C)^(0) + s s_(D)^(0))`
`Delta_(r )s_(4) = +(ps_(A)^(0) + qs_(B)^(0))`

Answer :C::D
Discussion
16041.

Which one among the following is a thermosetting plastic

Answer»

PVC
PVA
BAKELITE
PERSPEX

SOLUTION :Bakelite is thermoseting POLYMER. It becomes infusible on heating and can not be remoulded.
Discussion
16042.

Write the names and structures of the monomersof the following polymers : (i) Buna-S(ii) Neoprene (iii) Nylon-6

Answer»

SOLUTION :(i) Buna-S (STYRENE BUTADIENE RUBBER)
Discussion
16043.

The shape of the intermediate formed In nucleophilic addilion reaction of aldehydes and ketones is

Answer»

TRIGONAL planar
Tetrahedral
Trigonal bipyramidal
Bent

Answer :B
Discussion
16044.

Which of the following reduction reactions are actually employed in commercial extraction of metals?

Answer»

`Fe_(2)O_(3) + 2Al rarr Al_(2)O_(3)+Fe`
`Cr_(2)O_(3)+ 2Al rarr Al_(2)O_(3)+2Cr`
`2Na[Au(CN)_(2)]rarr ZN rarr NA[Zn(CN)_(4)]+2Au`
`Cu_(2)S + 2CuO rarr 6Cu + SO_(2)`

Answer :B::C::D
Discussion
16045.

Which of the following is non-conducting?

Answer»

`CoCl_(3).6NH_(3)`
`CoCl_(3).5NH_(3)`
`CoCl_(3).4NH_(3)`
`CoCl_(3).3NH_(3)`

ANSWER :D
Discussion
16046.

Write short note on polythene.

Answer»

Solution :Polythenes are linear or slightly branched long chain molecules.
These are capable of repeatedly softening on heating and hardening on cooling and are thus thermoplastic POLYMERS.
There are two types of polythene as given below :
(a) Low density polythene
(b) High density polythene.
(a) Low density polythene :
Preparation : It is polymerization of ethene under high pressure of 1000 to 2000 ATMOSPHERES at a temperature of 350 K to 570 K in the presence of traces of dioxygen or a peroxide initiator.
Properties : The low density polythene (LDP) have straight chain structure with some obtained by the branches as shown below.

The low density polythene is chemically inert and tough.
They are flexible and a poor conductor of electricity.
Uses : It is used in the insulation of electricity carrying wires.
It is also used in manufacture of squeeze bottles, toys and flexible pipes.
(b) High density polythene :
Preparation : It is formed when addition polymerization of ethene takes place in a hydrocarbon solvent in the presence of a catalyst such as triethylaluminium and titanium tetrachloride (Ziegler-Natta catalyst) at a temperature of 333 K to 343 K and under a pressure of 6-7 atmospheres. High density polythene (HDP) thus produced.
Properties : High density polythene (HDP) thus produced, consists of linear molecules as shown below and has a high density due to CLOSE packing. Such polymers are also called linear polymers.

This polymers are also chemically inert.
This polymers are more tough and hard.
Uses : It is used for manufacturing buckets, dustbins, bottles, pipes, etc.
Discussion
16047.

Which of the following is not a linear molecule ?

Answer»

`CO_(2)`
`BeCl_(2)`
`CS_(2)`
`SO_(2)`

ANSWER :D
Discussion
16048.

Write the monomers used for preparing following polymers : (i) glyptal (ii) Nylon-6,6

Answer»

Solution :Monomers of :
(i) Glyptal are : glycol `UNDERSET(CH_(2)-OH) underset(|)(CH_(2)-OH` and Phathalic acid,

(II) Nylon -66 : ADIPIC acid, `HO- overset(O) overset(||)C-(CH_(2))_(4)-COOH` and hexamethylene diamine, `H_(2)N-(CH_(2))_(6)-NH_(2)`
Discussion
16049.

When one coulomb of charge is passed the quantity of silver deposited is _________.

Answer»

1 g of silver
0.1 gram ATOM of silver
2 electrochemical of silver
1 chemical equivalent of silver

Answer :C
Discussion
16050.

Which one of the following has two alpha-D- Glucose units ?

Answer»

Maltose
Lactose
Cellulose
Sucrose

Answer :A
Discussion