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7001.

Which of the following is an amorphous solid?

Answer»

Diamond
Graphite
Glass
Common salt

Answer :C
Discussion
7002.

When sodium formate is heated in a current of CO_2 at 360^@ C we get :

Answer»

SODIUM FORMATE
Sodium oxalate
Sodium acetate
sodium carbonate

Answer :D
Discussion
7003.

Write one use of decron.

Answer»

SOLUTION :It is USED to MAKE FIBRES.
Discussion
7004.

Which of the following does not decolourise bromine solution in CS_2?

Answer»

Acetylene
Propene
Ethane
Propyne

Answer :C
Discussion
7005.

Which transition metal is synthetic ?

Answer»

Mo
Pm
Re
Tc

Answer :D
Discussion
7006.

Urea on heating with ethanol gives :

Answer»

URETHANE
UREA alcohol
Ureides
None

Answer :A
Discussion
7007.

Whichexhibit optical and geometrical isomerism-

Answer»

`CH_(3)CHCICH=CH_(2)`
`CH_(3)-CHCI-CH=CH_(2)`
`CH_(3)CH=CH-CH(CH_(3))_(3)`
`CH_(3)CH=CH-CH=C=CHCH_(3)`

ANSWER :A::C
Discussion
7008.

Which nomeclature is not according to IUPAC system-

Answer»


`CH_(3)-COCH_(2)CH_(2)CH_(2)COOH("5-oxohexanoic acid")`
`Br - CH_(2)-CH=CH_(2)("1-bromoprop - 2 - ene")`
`CH_(3)-CH_(2)-overset(CH_(3))overset(|)underset(Br)underset(|)C-CH_(2)-CHCH_(3)`("4 - bromo - 2,4 - dimethylhexane")

SOLUTION :Correct IUPACname is 3 - bromopropene.
Discussion
7009.

The weight of nickel (at .wt. =58.7) liberated by a current of 5 ampere flowing for193 second through NiSO_4 solution is :

Answer»

`0.587g`
`5.87 G`
`0.2935g`
`2.935g`

ANSWER :C
Discussion
7010.

The shape and bond angle of white Phosphorous molecules is

Answer»

Linear and `180^(0)`
Trigonal PLANAR and `120^(0)`
Tetrahedral and `109^(0)28^(1)`
Tetrahedral and `60^(0 )`

Answer :4
Discussion
7011.

Which one would give H_2O_2 with HCl ?

Answer»

`NO_2`
`MnO_2`
`BAO`
NONE

ANSWER :D
Discussion
7012.

When HCl gas is passed through propene in the presence of benzoyI peroxide, it gives

Answer»

ALLYL chloride
2-chloropropane
n-propyl chloride
No reaction

Answer :B
Discussion
7013.

Which of the following solution will have a pH exactly equal to 8?

Answer»

`10^(-8)` M HCL solution at `25^@C`
`10^(-8)` M `H^+` solution at `25^@C`
`2XX10^(-6) M Ba(OH)_2` solution at `25^@C`
`10^(-5)` M NaOHsolution at `25^@C`

ANSWER :b
Discussion
7014.

What is meant by ligand ? Explain their types with examples.

Answer»

Solution :The ligands are the atoms of groups of atoms bound to the central metal /ion. The atom in a ligand that is bound directly to the central metal atom is KNOWN as a donor atom.
Ligands are of `5` types
`(a)` Cationic ligand e.g., `NH_(2)-NH_(3)^(+)` Hydrazinium
`(b)` ANIONIC ligand e.g., `Br^(-)` Bromido
`(c )` NEUTRAL ligand e.g., `H_(2)O` Aqua
`(d)` Mono dentate ligandA ligand can be connected by one coordinate bond.
e.g., `F^(-)` fluorido
`(e )` Ambidendate ligandA ligand can be connected by more than one coordinate MODE.
e.g., -NCS ISO thio cyanato (KN)
-SCN thio cyanato (KS)
Discussion
7015.

When Cu^(2+) ion is treated with KI,a white precipiate is formed. Explain the reaction with the help of chemical equation .

Answer»

Solution :`i^(-)` ION is a strong REDUCING agent. It reduces `Cu^(2+)` to `Cu^(+)`
`2Cu^(2+) + 4I^(-) RARR underset("(WHITE ppt.)")(Cu_(2)I_(2)) + I_(2)`
Discussion
7016.

which of the following complexes show ionization isomerism ?

Answer»

`[CR(NH_(3))_(6)]Cl_(3)`
`K_(4)[FE(CN)_(6)]`
`[Cr(en)_(3)]Cl_(3)`
`[COBR(NH_(3))_(5)]SO_(4)`

Answer :D
Discussion
7017.

Which of the following is not the correct order for the stated property?

Answer»

`Ba gt Sr gt Mg`, atomic radius
`F gt O gt N` : first ionization ENTHALPY
`Cl gt F gt I`, electron affinity
`O gt SE gt Te`, electronegativity

Solution :On moving along the period, ionization enthalpy increases.
In SECOND period, the order of ionization enthalpy should be as follows : `FgtOgtN`
But N has half- FILLED structure, therefore, it is more stable than O. That.s why its ionization enthalpy is higher than O. Thus, the correct order of IE is `FgtNgtO`.
Discussion
7018.

What causes Brownian movement in a colloid?

Answer»

Solution :The colloidal SOL particles are CONTINUOUSLY BOMBARDED with the molecules of the DISPERSION medium and hence they follow a zigzag, random, CONTINUOUS movement.
Discussion
7019.

The statement that is not correct for the periodic classification of element is :

Answer»

The properties of ELEMENTS are the periodic functions of their ATOMIC numbers
Non-metallic elements are lesser in NUMBER than metallic elements
The first IONISATION energies of elements along a period do not vary in a regular manner with increase in atomic number
For transition elements the d-subshells are filled with electrons MONOTONICALLY with increase in atomic number.

Solution :The d-sub shells are not filled with electrons monotonically with increase in atomic number.There are some exceptions like Cr, Cu etc.
Discussion
7020.

Vitamin A, D, E andk are ………………vitamins .

Answer»

SOLUTION :FACT- SOLUBLE
Discussion
7021.

When diethyl ether is heated with sulphuric acid it forms

Answer»

Propanoic acid
Acetic acid
Ethyl ALCOHOL only
Ethyl HYDROGEN SULPHATE and ethanol

Answer :D
Discussion
7022.

Write the structures of the following compounds :4-tert, Butyl-3-iodoheptane

Answer»

Solution :4-tert, Butyl-3-iodoheptane :
`overset(1)(C )H_(3)overset(2)(C )H_(2)-overset(" I")overset(" |")(""^(3)C)H-UNDERSET(H_(3)C-underset(CH_(3))underset("|")("C ")-CH_(3))underset("| ")(overset("4 ")("C "))-overset(5)(C )H_(2)overset(6)(C )H_(2)overset(7)(C )_(3)`
Discussion
7023.

Which of the following is o-choro toluene ?

Answer»




ANSWER :C
Discussion
7024.

Write the following reactions : (a) Swart's reaction (b) Sandmeyer reaction(c) Wurtz-Fittig reaction

Answer»

SOLUTION :(a) Swart.s reaction
`underset("Methyl bromide")(CH_(3)Br+ AgF) to underset("Methyl FLUORIDE")(CH_(3)F+ AGBR)`
(b) SANDMEYER reaction

(c)Wurtz-Fittig reaction
Discussion
7025.

Which of the following does not show positive deciation from Raoult's Law ?

Answer»

Benzene-chloroform
Benzen-acetone
Benzene-ethanol
Benzene-carbon tetrachloride.

Solution :Benezne-chloroform SHOWS NEGATIVE deviation form Raolul's law because attreactive forces INCREASES.
Discussion
7026.

Which of the following is zero for an isochoric process?

Answer»

`DELTAP`
`DELTAV`
`DeltaT`
`DELTAE`

Answer :B
Discussion
7027.

Tollen's reagent is used for the detection fo aldehyde when a solution of AgNO_(3) is added to glucose with NH_(4)OH then gloconic acid is formed Ag^(+)toe^(-)toAg,E_(Red)^(@)=0.8V C_(6)H_(12)O_(6)+H_(2)Oto"gluconic acid"(C_(6)H_(12)O_(7)) +2H^(+)+2e^(-),E_(red)^(@)=-0.05V Ag(NH_(3))_(2)^(+)+e^(-)toAg(s)+2NH_(3),E_(red)^(@)=0.337V ["Use "2.303xx(RT)/(F)=0.0592 and (F)/(RT)=38.92" at "298K] Q. When ammonia is added to the solution, pH is raied to 11. Whichhalf-cell reaction is affected by pH and by how much

Answer»

`E_("oxi")` will INCREASE by a factor of 0.65 from `E_(0" xi")^(@)`
`E_(oxi)` will decrease by a factor of 0.65 from `E_("oxi")^(@)`
`E_(red)` will increase by a factor of 0.65 from `E_(red)^(@)`
`E_(red)` will decrease by a factor of 0.65 from `E_(red)^(@)`.

Solution :On increasing concentration of `NH_(3)`, the concentration of `H^(+)` ION decreases, therefore.
`E_(red)=E_(red)^(o)-(0.0592)/(n)log_(10)[H^(+)]^(2)`
`=0-(0.0592)/(2)xx2log_(10)10^(-11)`
`(becausepH=11,therefore[H^+]=10^(-11)M)`
`=0.0592xx11=0.6512V=0.65V`
`E_(red)` increased by a factor of 0.65 from `E_(red)^(o)`.
Discussion
7028.

Which of the following has longest C - O bond length ? (Free C - O bond length in CO is 1.128 A^@)

Answer»

`[FE(CO)_4]^(2-)`
`[Mn(CO)_6]^(+)`
`NI(CO)_4`
`[Co(CO)_4]^(Ө)`

Answer :A
Discussion
7029.

Whichof the following drug supess the ovluation in female?

Answer»

refebadine
norethindrone
valium
penicillin

Answer :B
Discussion
7030.

Tollen's reagent is used for the detection fo aldehyde when a solution of AgNO_(3) is added to glucose with NH_(4)OH then gloconic acid is formed Ag^(+)toe^(-)toAg,E_(Red)^(@)=0.8V C_(6)H_(12)O_(6)+H_(2)Oto"gluconic acid"(C_(6)H_(12)O_(7)) +2H^(+)+2e^(-),E_(red)^(@)=-0.05V Ag(NH_(3))_(2)^(+)+e^(-)toAg(s)+2NH_(3),E_(red)^(@)=0.337V ["Use "2.303xx(RT)/(F)=0.0592 and (F)/(RT)=38.92" at "298K] 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
`28.30`
46.29

Solution :Cell reaction
(i) `AG^(+)+e^(-)TOAG(s),E_(red)^(o)=0.8V`
(ii) `C_(6)H_(12)O_(6)+H_(2)OtoC_(6)H_(12)O_(7)+2H^(+)+2e^(-),E_("oxid")=-0.05V` ltBrgt Hence, for reaction
`2Ag^(+)+C_(6)H_(12)O_(6)+H_(2)Oto2Ag_((s))+C_(6)H_(12)O_(7)+2H^(+)`
`E_(cell)^(o)=(0.8-0.05)`
`=0.75V`
`E_(cell)^(o)=E_("ANODE")^(o)-E_("cathode")^(o)`
`=[-0.05-(-0.8)]V`
on the basis of oxidised electrode potential
`=0.75V` By nernst EQUATION
`E_(cell)=E_(cell)^(o)=(2.303RT)/(nF)log_(10)K`
At equilibrium `E_(cell)=0`
`thereforeE_(Cell)^(o)=(2.303RT)/(2)log_(10)K`
`0.75=(0.0592)/(2)log_(10)K) `
`log_(10)K=(2xx0.75)/(0.0592)=25.33`
or In `K=2.303xxlog_(10)K`
`=2.303xx25.33=58.35`.
Discussion
7031.

Which of the following oxides is the most acidic?

Answer»

`CO_2`
`AI_2 O_3`
`P_2 O_5`
`SO_3`

ANSWER :C
Discussion
7032.

Which of the following are not valid Van't hoff factors?

Answer»

2.2 during ionisation of MX
1.6 during ionisation of `MX_(2)`
0.3 during DIMERISATION of A
5.6 during ionisation of `K_(4)[Fe(CN)_(6)]`

ANSWER :A::C::D
Discussion
7033.

Which one of the following is most reactive toward electrophilic reagent?

Answer»




SOLUTION :Electron DONATING effect DECREASES in the order `-OHgt-OCH_(3)gt-NHCOCH_(3)gt-CH_(3)gt-CH_(2)OH`. Therefore, `-OH` group is most strongly electron donating group and hence (B) i.e., o-cresol is most reactive towards electrophilic reagent.
Discussion
7034.

Which ·one of the following statements is correct?

Answer»

All AMINO ACIDS except lysine are OPTICALLY active
All amino acids are optically active
All amino acids except GLYCINE are optically active
All amino acids except glutamic acids are optically

Solution :Glycine is `alpha`-amino ACID with no chiral carbon thus optically inactive.
Discussion
7035.

To prepare aqueous buffer solution of pH = 2.85 that efficiently resists a change in pH yet contains only a small amount of buffereing agent. Which one of the following weak acid together with its salt would be best to use?

Answer»

<P>m - chlorobenzoic acid `( p K_(a) = 3.98)`
p-chloro cinnamic acid `( pK_(a) = 4.41)`
2,5-dihydroxy BENZOIC acid `( p K_(a) = 2.97)`
Acetoacetic acid `( p K_(a) = 3.58)`

Answer :C
Discussion
7036.

Write the structure of the major organic product in each of the following reaction : (CH_(3))_(3)CBr + KOH underset("heat") overset("ethanol") to

Answer»

Solution :Reactions GIVING the structure of main organic product, are as under :
`underset("2-Bromo -2-methylpropane") ((CH_(3))_(3)CBr + KOH) underset(("DEHYDROHALOGENATION "))overset"ETHANOL, heat" to underset("2-Methylpropene") (CH_(3) - overset(CH_(3))overset(|) C =) CH_(2) + KBR + H_(2) O `
Discussion
7037.

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

Answer»

SOLUTION :DIFFERENCE between WHITE PHOSPHORUS and RED phosphorus.

Discussion
7038.

What is solvent extraction ? What is the main difference between cupellation and poling ?

Answer»

Solution :Solvent extraction is the latest separation technique and has become popular because of its simplicity and speed. The method is based on preferential solubility principles.
Solvent or liquid-liquid extraction is based on the principle that a solute can distribute itself in a certain ratio between two immiscible solvents, one of which is usually water and the other an ORGANIC solvent such as benzene, carbon tetrachloride or CHLOROFORM. In certain cases, the solute can be more or less completely transferred into the organic phase. The technique can be used for the purepose of preparation, purification, enrichment, separation and analysis.
Both cupellation and poling are used for refining of metals. In cupellation, impurities of other metals with traces of LEAD are removed from silver by heating impure silver with a blast of air in a cupel (an oval shaped pan made up of bone ash) in which lead is oxidized to lead OXIDE (PbO), which being volatile escapes leaving behind pure silver.
Poling is used for refining of such metals which contain impurities of its own oxide. In this process, the molten impure metal is stored with green wooden poles. At the high temperature of the molten metal, wood liberates methane which reduces the oxide of the metal to free metal.
`3Cu_(2)O + CH_(4) RARR 6Cu + 2H_(2)O + CO`
Discussion
7039.

Which of the following will decolourze Br_(2) water ?

Answer»

`CH_(2)=CH_(2)`
`Me-C-=C-Me`

SOLUTION :N//A
Discussion
7040.

Which one of the following groupinga represents a collection of isoelectronic species ? [ At.nos- Cs - 55 , Br - 35 ]

Answer»

`Ca^(2+)` , `Cs^+` , Br
`Na^+` , `Ca^(2+)` , `Mg^(2+)`
`N^(3-) , F^- , Na^+`
Be, `Al^(3+), CL^-`

ANSWER :C
Discussion
7041.

The reagent with which ethanol is oxidised to ethanal is

Answer»

Tollen's REAGENT
NITROBENZENE
PCC
CHROMIC acid

ANSWER :C
Discussion
7042.

Whe excess of KCN is added to a solution of copper sulphate , the final product formed is "…..................".

Answer»

SOLUTION :`K_(3)[CU(CN)_(4)]`, i.e., POTASSIUM tetracyanocuprate (I)
Discussion
7043.

Which property of the transition elements makes them good catalysts ?

Answer»

SOLUTION :They have VACANT d-orbitals for FORMATION of BONDS with the REACTANTS.
Discussion
7044.

Which of the order is incorrect ?

Answer»

Acidic strength :
`overset(Θ)O -underset(O)underset(||)(C)-underset(O)underset(||)(C)-OH lt H-underset(O)underset(||)(C)-OH`
Acidic strength :

Stability order :

BASIC strength order:
`Et_(2)NH gt Et_(3)N gt Et-NH_(2) gt NH_(3)` (In `H_(2)O` )

Solution :(1)
(3) -1 EFFECT
Discussion
7045.

When excess of SnCl_2 is added to a solution of HgCl_2, a white ppt. turning to grey is obtained. This grey colour is due to the formation of:

Answer»

`Hg_2Cl_2`
`SnCl_4`
`SN`
`HG`

ANSWER :D
Discussion
7046.

Which of the following atoms has the highest first ionisation energy ?

Answer»

K
Sc
Rb
Na

Answer :B
Discussion
7047.

What is meant by Faraday constant?

Answer»

SOLUTION :FARADAY constantF=96500 coulombs. It is that quantity of electricity which DEPOSITS one gram equivalent of the substance or it is the charge carried by one MOLE of ELECTRONS.
Discussion
7048.

What are narcotic and non- narcotic drugs. Give examples.

Answer»

Solution :(i) Narcotic drug is an addictive drug that reduces pain, induces sleep and may alter MOOD or behaviour. Example: MORPHINE and codeine.
(II) Non-narcotic drug are chemical substance (MEDICATIONS) used to control pain and inflammation. They are available at drugstores without a prescription or by prescription when given at higher doses. Example: Acetaminophen and paracetamol.
Discussion
7049.

What mass of H_(2)C_(2)O_(4). 2H_(2)O (mol.mass=126) should be dissoved in water to prepare 250mL of centinormal solution which act as a reducing agent?

Answer»

0.635 g
0.1575 g
0.1263 g
0.835 g

Answer :B
Discussion
7050.

Which of the following gases would have the highest RMS speed at 0^@C :

Answer»

`O_3`
`CO_2`
`SO_3`
CO

ANSWER :D
Discussion