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19201.

What is the relationship between the following two complex ions ? (I) [Co (NH_(3))_(4) Cl]^(+) (II) [Co (NH_(3))_(4) (ONO) Cl]^(+) The complex ions are

Answer»

COORDINATION isomers
optical isomers
linkage isomers
geometric isomers

Answer :C
Discussion
19202.

When 1,1-dichloropropane and 2,2-dichloro propane are reacted separately with aqueous potassiumhydroxide solution compounds A and B are formed. Both A and B gave the same product C on reduction using amalgamated zinc and HCl. Identify C

Answer»

PROPYL alcohol
Isopropyl alcohol
Propyl chloride
Propane

Answer :D
Discussion
19203.

Which member of group 13 is liquid at 30^@C ?

Answer»

B
Al
Ga
Tl

Answer :C
Discussion
19204.

Why are haloalkanes more reactive towards nucleophilic substitution reaction than haloarenes?

Answer»

Solution :Haloalkanes are more reactive than haloarenes towards nucleophilic substitution reactions due to the following reasons :
(a) There is partial double bond character in the C - Cl bond due to resonance effect in haloarenes. There is no such effect in haloalkanes. It is more difficult to break a double bond than a single bond.
(b) Carbon attached to halogen is `SP^(3)`hybridised in haloalkane and `sp^(2)`hybridised in haloarenes and `sp^(3)`hybridised carbon inless ELECTRONEGATIVE than `sp^(2)`hybridised carbon, due to less s character. THUS, C- X bond in haloalkane releases more electrons to halogen.
(c) It is difficult for ELECTRON rich nucleophiles to approach electron rich benzene ring in haloarenes. There is no such thing in haloalkanes.
Discussion
19205.

Write the chemical equation preparation of Ferrocene.

Answer»

SOLUTION :`2C_2H_5MgBr+FeCl_2rarr(C_2H_5)Fe+2MgBrCI`
Discussion
19206.

Which is a mixed salt ?

Answer»

`NaHCO_3`
CA(OCL)CL
`K_2SO_4Al_2(SO_4)_324H_2O`
`MgBr_2`

ANSWER :B
Discussion
19207.

Which one of the following amino acid does not contain heterocyclic ring structure

Answer»

Tryptophan
Histidine
Proline
Valine

Answer :D
Discussion
19208.

Which of the following is a hydrophilic colloidal solution?

Answer»

BARIUM sulphate SOL
Arsenious SULPHIDE sol
SILVER iodide sol
Starch sol

Answer :D
Discussion
19209.

While separating a mixture of ortho- and para-nitrophenols steam distillation, name the isomer which will be steam volatile. Give reason.

Answer»

SOLUTION :o-Nitrophenol is steam-volatile due to CHELATION (INTRAMOLECULAR H-bonding) and HENCE can be separated by steamm distillation from p-nitrophenol which is not steam volatile because of intermolecular H-bonding.
Discussion
19210.

Which of the following statement is 'false' about galvanic cell ?

Answer»

cathode is positively CHARGED
it is MADE up of two half-cells
REDUCTION takes PLACE at the anode
dry-cell is non reversible in nature

SOLUTION :For galvanic cell , oxidation takes place at anode .
Discussion
19211.

Which will give positive iodoform test :

Answer»




`CH_3-CHOH-CH_3`

ANSWER :D
Discussion
19212.

What is the volume of '20 volume H_(2)O_(2)' required to get 5000 cm^(3) of oxygen at S.T.P ?

Answer»

`250cm^(3)`
`50cm^(3)`
`100cm^(3)`
`125cm^(3)`

Solution :20 VOLUME `H_(2)O_(2)`
`because` 20cc oxygen OBTAINED form=1 cc `H_(2)O_(2)`
`THEREFORE `1cc oxygen obtained from
`=(1)/(20)` cc `H_(2)O_(2)`
`therefore `5000 cc oxygen obtained from
`=(5000)/(20)` cc `H_(2)O_(2)=250` cc `H_(2)O_(2)`.
Discussion
19213.

Which of the following species does not exist ?

Answer»

`SnCl_(6)^(2-)`
`GeCl_(6)^(2-)`
`C Cl_(6)^(2-)`
`SiCl_(6)^(2-)`

Solution :Carbon cannot have VALENCY more than FOUR.
Discussion
19214.

Type of anios in which delocatisation of negative charge occrur on more electronegative atom are highly stabilized. If negative charge deloclisation occur on same element then stability is decided by number of resonaating sturcture. Cyclic anions which are aromatic are highly stabilized but if cyclic anions are antiaromatic, they are highly destabise due to presence of unpaired electrons in antibonding molecular orbital Find out most stable anion among following anions :

Answer»




SOLUTION :
Discussion
19215.

X' is a neutral oxide. On exposure to air 'X' is converted to 'Y', which is an acidic oxide. Then 'X' and 'Y' are

Answer»

`N_2O,NO`
`NO,NO_2`
`NO_2,NO`
`NO_2,N_2O_4`

ANSWER :B
Discussion
19216.

Which of the following has minimum mp

Answer»

CsF
HCL
HF
LiF

Solution :HCl CONTAIN WEAK COVALENT BOND.
Discussion
19217.

The relationship between free energy and electrode potential is

Answer»

`DELTAG = NFE`
`DeltaG = nFE`
`DeltaG = (nFE)/(R)`
`DeltaG = (DELTAH)/(nFE)`

ANSWER :A
Discussion
19218.

Whichof the following is chian growth polymer ?

Answer»

NYLON -26
PVC
Nylon -66
Nylon -6

Answer :B
Discussion
19219.

The total number of geometrical and optical isomers for the complex ion dichlorobis (ethylenediamine)rhodium (III) is :

Answer»

FOUR
three
two
six.

SOLUTION :Two geometrical cis and TRANS
Out of these only cis is OPTICALLY active
Discussion
19220.

Which of the following is an acceptable value of molecularity ?

Answer»

`4//3`
0
`1//2`
`2//2`

Solution :MOLECULARITY can not be zero , fractional or more than THREE .
Discussion
19221.

Which of the following is FALSE for elastomers?

Answer»

These are synthetic polymers
In elastomers, TEARING is PREVENTED to cross linking
Vulcanised rubber is an EXAMPLE of elastomer
 Elastomers are HARD and cannot stretched easily

Answer :D
Discussion
19222.

Which pair of oxyacids of phosphorus contains 'P-H' bonds ?

Answer»

`H_3PO_4,H_3PO_3`
`P_3PO_(5),H_(4)P_2O_7`
`P_3PO_(3),H_(3)PO_2`
`H_3PO_(2),HPO_3`

ANSWER :C
Discussion
19223.

Total number of plane of symmetry present in given compound is

Answer»


SOLUTION :
Discussion
19224.

Which of the following orders are correct ?

Answer»

`[FE(CO)_(4)]^(2-) lt [Co(CO)_(4)]^(-) lt [Ni(CO)_(4)] implies` STRETCHING vibrational frequency of C-O bond
`[Mn(Co)_(5)]^(-) lt [Mn(CO)_(6)]^(+) imples` EAN of central metal ion
`Trien=imda^(2-) implies " Denticity of ligand "`
`[Ni(en)_(3)]^(2+) lt [Ni(NH_(3))_(2)(en)_(2)]^(2+) implies` Number of STEREO isomers

Solution :(d) `[Ni(NH_(3))_(2)(en)_(2)]^(2+) implies "trans"`,cis (op. active)
Discussion
19225.

Which of the following group of compounds are extinguisher, antiseptic, insecticide and anesthetic respectively ?

Answer»

`CHCl_(3), CHI_(3), DDT, C Cl_(4)`
`DDT, CHCl_(3), C Cl_(4), CHl_(3)`
`C Cl_(4), CHI_(3), DDT, CHCl_(3)`
`C Cl_(4), CHI_(3), CHCl_(3), DDT`

Answer :C
Discussion
19226.

Which of the polyhalide ions is not known?

Answer»

`F_(3)^(-)`
`Br_(2)^(-)`
`Cl_(3)^(-)`
`I_(3)^(-)`

SOLUTION :`F_(3)^(-)` does not EXIST because of absence of d - ORBITALS in F atom.
Discussion
19227.

Whatare thespeciesX andY in thefollowingX + H_(2) O toH_(2) Cr_(2) O_(7)overset(OH^(-))(to)

Answer»

`CrO_(3) ,CrO_(4)^(2-)`
`CrO_(3), Cr_(2) O_(3)`
`CrO_(4)^(2-) , Cr_(2)O_(7)^(2-)`
`H_(2)CrO_(4), H_(2) Cr_(2) O_(7)`

ANSWER :A
Discussion
19228.

When ethanol is mixed with ammonia and passed over catalyst,the compound formed is :

Answer»

`C_2H_5NH_2`
`C_2H_4`
`C_2H_5OC_2H_5`
`CH_3OCH_3`

ANSWER :A
Discussion
19229.

Which of the following structures represents the peptide chain?

Answer»




ANSWER :A
Discussion
19230.

Write the molecular formula and IUPAC name of the following compounds. (i) Vinyl alcohol (ii) Sorbitol

Answer»

Solution :(i) Vinyl alcohol
`CH_2 = CHOH`
IUPAC name: Ethenol
(II) Sorbitol
`OH - CH_2 - (CHOH)_4 - CH_2OH`
IUPAC name: Hexan-1, 2, 3, 4, 5, 6- hexol
Discussion
19231.

What is known as intercalation?

Answer»

Solution :When a POTENTIAL greater than the emf produced by the cell is applied across the ELECTRODE, the cell REACTION is reveresed and now the `Li^(+)` ions move from cathode to ANODE where they become embedded on the porous electrode. This is KNOWN as intercalation.
Discussion
19232.

The transformation of ammonium cyanate into urea on heating is:

Answer»

CATALYTIC change
thermal DECOMPOSITION
thermal DISSOCIATION
Isomeric change

Answer :D
Discussion
19233.

Whichof the followingis morebaiscin aqueousmedium ?

Answer»

`CH_(3) - NH_(2)`
`PH- CH_(2) NH_(2)`
`(CH_(3))_(2)NH`
Discussion
19234.

Which one of the following is an example of a thermosetting polymer-

Answer»

`(--CH_2-underset"CL"underset|C=CH-CH_2--)_n`
`(--CH_2-CH_2--)_n`
`(--oversetoverset(H)|N-(CH_2)_6-oversetoversetH|N-oversetoversetO(||)C-(CH_2)_4-oversetoverset(O)(||)C--)_n`

ANSWER :D
Discussion
19235.

Which one of the following is produced when acetone is saturated with HCl gas?

Answer»

Acetone alcohol
Phorone
Mesityl oxide
Benzene

Solution :When acetone saturated with HCL gas at LOW temperature, it forms mesityl oxide and phorone which can be SEPARATED by DISTILLATION.
Discussion
19236.

Which structure represent 1,4-dichlorohex-3-en-1-yne?

Answer»




ANSWER :B
Discussion
19237.

X gram of pure As_2S_3 is completely oxidised to respective highest oxidation states by 50 ml of 0.1 M hot acidified KMnO_4 then X, mass of As_2S_3 taken is : (Molar mass of As_2S_3=246)

Answer»

22.4 G
0.22 g
64.23 g
None

Solution :`5As_2S_3+28KMnO_4+H^(+)to10H_3AsO_4+28Mn^(2+)+SO_4^(2-)`
MEQ of `As_2S_3`=meq. of `KMnO_4`
`X/246xx1000xx28=50xx0.1xx5 " " X=0.22 g`
Discussion
19238.

The role of phosphate in detergent powder is to:

Answer»

Control pH level of the detergent water mixture
REMOVE `Ca^(2+) and Mg^(2+)`ions from the water that CAUSES the hardness of water
Provide WHITENESS to the fabrics
Form SOLID detergent as phosphate-less detergent are liquid in nature.

ANSWER :B
Discussion
19239.

Which statement is wrong with reference to physical adsorption ?

Answer»

Gases having liquid STATE adsorbed EASILY.
Multimolecular layer is FORMED on the surface of adsorbent at high pressure.
The value of adsorption enthalpy is less and positive.
Van der Waals' ATTRACTION is present. 

Solution :The value of adsorption enthalpy is less and positive.
Discussion
19240.

What is the name of the diagram that helps in predicting the feasibility of thermal reduction of an ore?

Answer»

SOLUTION :ELLINGHAM.
Discussion
19241.

Which is used as a neutron absorber in nuclear reactors to control the chain reaction ?

Answer»

CADMIUM rods
Uranium carbide
Deutron
Heavy water

Answer :A
Discussion
19242.

What does cellulose give on complete hydrolysis?

Answer»

D - ribose
D - glucose
L - glucose
D - FRUCTOSE

ANSWER :B
Discussion
19243.

Which of the following is an appropriate set of reactants for the preparation of 1-methoxy-4-nitrobenzene and why ?

Answer»

SOLUTION : <BR> It is because of double bond character, (C – Br) bond in
due to RESONANCE it is less reactive towards SN, RXN.
Discussion
19244.

Which factor imparts crystalline nature to a polymer like nylon ?

Answer»

SOLUTION :Linear STRUCTURE and strong intermolecular forces like H-bonding LEAD to close PACKING of polymer chains and hence IMPARTS crystalline character.
Discussion
19245.

Which one of the following reaction will givne NO (nitric oxide) gas as one of the products?

Answer»

`3 Cu+8HNO_(3) (dilute)RARR`
`Cu + 4HNO_(3)(CIBC)rarr`
`4Zn + 10HNO_(3)(dilute)rarr`
`Zn+4HNO_(3)(conc)rarr`

Solution :Dilute nitric acid reacts with COPPER to release nitric oxide
`3Cu(s)+8HNO_(3)(aq)rarr3Cu(NO_(3))(aq)+2NO(G)+4H_(2)O(1)`
Discussion
19246.

Write sturcutre of the following compounds : (i) Mesityl oxide , (ii) Pinacol (iii) Pinacolone , (iv) Acetaldol (v) Methyl vinyl ketone (vi) Phorone (vii) 3-Phenylprop-2-enal (viii) 1-Phenylpropan-1-one. (ix) 3-Methylbutanal (x) p-Nitropropiophenone. (xi) p-Methyl benzaldehyde.

Answer»

Solution :(i) `CH_(3)-underset(CH_(3))underset(|)(C)=CH-overset(O)overset(|)(C)-CH_(3)`
(ii) `CH_(3)-overset(CH_(3))overset(|)underset(OH)underset(|)(C)-underset(OH)underset(|)overset(CH_(3))overset(|)(C)-CH_(3)`
(III) `CH_(3)-overset(O)overset(||)(C)-underset(CH_(3))underset(|)overset(CH_(3))overset(|)(C)-CH_(3)`
(iv) `CH_(3)CH(OH)CH_(2)CHO`
(V) `CH_(2) = CH-COCH_(3)`
(vi) `CH_(3)-underset(CH_(3))underset(|)(C)=CH-overset(O)overset(||)(C)-CH=underset(CH_(3))underset(|)(C)-CH_(3)`
(VII) `underset(C_(6)H_(5))underset(|)(HC)=HC-CHO`
(viii) `C_(6)H_(5)-overset(O)overset(||)(C)-CH_(2)-CH_(3)`
(IX) `CH_(3)underset(CH_(3))underset(|)(C)HCH_(2)CHO`
(x)
(xi)
Discussion
19247.

When a while substance A was treated with dil. Hydrochloric acid, a colourless gas B was evolved, whichh turned moist litmus paper red. On bubbling B through lime water a precipitate C was formed but passage of further gas resulted in a clear solution D. A small sample of A moistened with conc. HCl acid and placed on a platinum wire and introduced into a Bunsen burner flame where it caused a green flame coloration. On strong heating A decomposed, giving a white solid E which turned red litmus paper blue. 1.9735 g of A was heated strongly and gave 1.55334 g of E. The sample of E was dissolved in water and made up to 250 ml in a standard flask, 25 ml aliquots were titrated with acid and required 20.30 ml of 0.0985 M HCl acid. Name the compounds A to E and give equations for all the reactions. Calculate the gram molecular weight of A.

Answer»

Solution :`underset(A)(MCO) overset("dil HCL")to underset(B)(MCl_(2) + CO_(2))`
`CO_(2) + Ca(OH)_(2) to underset( C)(CaCO_(3)) + H_(2)O overset(Delta) to underset(D)(Ca(HCO_(3))_(2)`
`underset(A)(MCO_(3)) overset(Delta)to underset(E)(MO + CO_(2))`
M may be BARIUM, as we get green coloration to bunsen flame.
Meq. of A = Meq of E = Meq of HCl
`(1.9735 XX 2 xx 1000)/("Mol wt") = (20.30 xx 250 xx 0.0985)/25`
Mol wt. = 196.3
Which confirms M to be Barium.
Discussion
19248.

Which of the following is not an antacid ?

Answer»

Phenelzine
Ranitidine
Aluminium hydroxide
Cimetidine

Answer :A
Discussion
19249.

The reagents, NH_4 Cl and aqueous NH_3 will precipitate

Answer»

`Ca^(2+)`
`AL^(3+)`
`Bi^(3+)`
`MG^(2+)`

Solution :`Al^(3+)` is a group III basic radical and `Bi^(3+)` is a group II basic radical . Both of these radicals GET precipitated as their hydroxides i.e, `Al (OH)_(3)` and `Bi(OH)_(3)` respectively with `NH_4Cl + NH_(4) OH ` (or aq. `NH_(3)`) in their respective GROUPS.
Discussion
19250.

Which is the oxidized product obtained when benzene diazonium chloride reacts with phosphonic acid in presence of water ?

Answer»

CHLORO BENZENE
Phenol
Benzene
PHOSPHORUS acid

ANSWER :D
Discussion