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14401.

When NaNO_2 and dilute HCl were added to an amine at 0^@C a colourless gas was evolved and an ionic compound is formed. The amine is :

Answer»

Any PRIMARY AMINE
An AROMATIC primary amine
Any amine
None

Answer :B
Discussion
14402.

Which metal does not contain more than one oxidation state?

Answer»

Co
Zn
Ti
Mn

Answer :B
Discussion
14403.

Which of the following statements is correct regarding the slag obtained during the extraction of a metal like copper or iron?

Answer»

The SLAG is lighterand has higher melting point than the metal
The slag is LIGHTER and has lower melting point than the metal
The slag is HEAVIER and has higher melting point than the metal
The slag is heavier and has lower melting point than the metal

Answer :B
Discussion
14404.

Which of the following reactions shows acidic nature of alcohol ?

Answer»

`ROH+HOOCR to RCOOR + H_2O`
`2ROH + 2Na to 2RONa + H_2`
`ROH + ClOCR to RCOOR + HCl`
`ROH + HCl to RCl + H_2O`

Answer :B
Discussion
14405.

Which of the following properties of IA group metals increases as the atomic number rises: (a) Metallic character (b) Ionic radius (c ) Melting point (d) Density (e ) Ionization potential Correct answer is:-

Answer»

a,B,c
a,b,d
c,d,e
All

Answer :B
Discussion
14406.

The structure of (G) is shown below: Which of the statement(s) is//are correct about (G)?

Answer»

It is a `GAMMA`-lactone.
It is a `DELTA`-lactone
It has FURANOSE structure.
It has PYRANOSE structure.

Answer :A::C
Discussion
14407.

Which of the following is isophthaldehyde ?

Answer»




ANSWER :C
Discussion
14408.

Which of the following is aredox reaction ?

Answer»

`NaCl+KNO_(3)toNaNO_(3)+KCl`
`CaC_(2)O_(4)+2HCL to CaCl_(2)+H_(2)C_(2)O_(4)`
`Mg(OH)_(2)+2NH_(4)CltoMgCl_(2)+2NH_(4)OH`
`Zn+2AgCnto2Ag+Zn(CN)_(2)`

SOLUTION :`ZntoZn^(2+)+2e^(-)`
`2Ag^(+)+2e^(-) to 2Ag`
`therefore` (d) is a redox reaction.
Discussion
14409.

Write the reactions involved in Williamson synthesis of 2-ethoxy-3-methylpentane, starting from ethanol

Answer»

Solution :`CH_3CH_2OHunderset(-SO_2,HCL)OVERSET(+SOCl_2)(RARR)CH_3CH_2Cl(X)`
`CH_3-overset(OH)overset(|)(CH)-UNDERSET(CH_3)underset(|)(CH)-CH_2-CH_3underset(-H_2)overset(+Na)(rarr)CH_3-overset(ONA)overset(|)(CH)-underset(CH_3)underset(|)(CH)-CH_2-CH_3(Y)`
`X+Y overset(S_N2)(rarr)CH_3-overset(OC_2H_5)overset(|)(CH)-underset(CH_3)underset(|)(CH)-CH_2-CH_3`
Discussion
14410.

Whichof theseis trueregarding an alphaparticlewith mass 'm' projectedtowards the nucleus with velocity 'v ?

Answer»

When the PARTICLE stopsat distance of CLOSEST approach its kinetic energy converts in toelectrostatic potential energy
number of `ALPHA`particles that strike the screen isdirectly proportional to the square of NUCLEAR charge
higher the kinetic energy of the `alpha` particlelesser the deflection
all the above statement are true

Answer :D
Discussion
14411.

What happens whennitrous acid is treated with N,N-diemthyl anilne?

Answer»

SOLUTION :
Discussion
14412.

Tolueneoverset ( Delta )overset( KMnO_4 {+KOH))to Aoverset( H_3O^(+))to C. " n- propyl benzene "underset(Delta ) overset( KMnO_4+KOH) toP overset( H_3O^(+)) to Q

Answer»

<P>A and P are DIFFERENT but C and Q are same
A and P are different and C and Q are different
A and P are same and C and Q are same
C and Q are benzaldehyde

Answer :C
Discussion
14413.

What is the coordination entity formed when excess of aqueous KCN is added to an aqueous solution of copper sulphate? Why is that no precipitate of copper sulphate is obtained when H_(2) S (g) is passed through this solution

Answer»

Solution :First cupric cyanide is formed which DECOMPOSES to give cuprous cyanide and cyanogens gas. Cuprous cyanide dissolves in excess of potassium cyanide to form the complex
`K_(3)[Cu(CN)_(4)]`
`CuSO_(4)+2KCN to Cu(CN)_(2) +K_(3) SO_(4)]xx2`
`2Cu(CN)_(2)toCu_(2)(CN)_(2)+(CN)_(2)`
, `Cu_(2) (CN)_(2) +6KCNto 2K_(3)[Cu(CN)_(4)]`
`CuSO_(4)+10KCNto 2K_(3)[Cu(CN)_(4)]+2K_(2)SO_(4)+(CN)_(2)`
Thus the coordination entity formed = [Cu(CN)4] As CN is a strong LIGAND, the complex ion is highly stable and does not dissociate / ionize to give `Cu^(2+)` Hence, no precipitate with `H_(2)S`.is formed
Discussion
14414.

What happens whenchlorobenzene is subjected to hydrolysis,

Answer»

SOLUTION :Chlorobenzene will not undergo hydrolysis READILY due to partial double bond CHARACTER of C - Cl bond because of resonance. HOWEVER, it can be hydrolysed to phenol under extreme Conditions of 623 K and 300 ATM pressure. The hydrolysis becomes easy if any electron withdrawing group is present at o - or p - positions.
Discussion
14415.

What happends when nitroethane is treated with LiAlH_(4)?

Answer»

SOLUTION :`C_2H_5NO_2 OVERSET(LiAlH_4)RARR C_2H_5 - NH_2 + 2 H_2O`
Discussion
14416.

Which one of the following is the formula of Schiff's base?

Answer»

`C_6H_5 -NH NH_2`
`C_6H_5CH = N - C_6H_5`
`C_6H_5NH -NHC_6H_5`
`C_6H_5CH_2NH_2`

SOLUTION :`C_6H_5CH = N - C_6H_5`
Discussion
14417.

Which of the following combinations would not result in the formation of a buffer solution ?

Answer»

`NH_(4)Cl+NH_(3)`
`CH_(3)COONa+CH_(3)COOH`
`HCl+CH_(3)COOH`
`HCOONa+HCOOH`

Answer :C
Discussion
14418.

What is the coordination number of atoms in bcc, hcp and ccp and simple cubic lattices?

Answer»

8, 12, 12, 6
6, 12, 12, 8
12, 6, 8, 12
12, 12, 8, 6

ANSWER :A
Discussion
14419.

Which of the following complex ion is expected to absorb visile light ?

Answer»

`[Zn(NH_(3))_(4)]^(2+)`
`[Sc(H_(2)O)_(3)(NH_(3))_(3)]^(3+)`
`[TI(EN)_(2)(NH_(3))_(2)]^(4+)`
`[Cr(NH_(3))_(6)]^(3+)`

Answer :C::D
Discussion
14420.

Which one of the following is an example for an autocatalysis ?

Answer»

`4CHCl_3 + 3O_2 OVERSET(C_2H_5OH) to 4COCl_2 + 2H_2O + 2Cl_2`
`2H_2 + O_2 overset(CO)to 2H_2O`
`2H_2O_2 overset("ETHANOL")to 2H_2O + O_2`
`2AsH_3 to 2As+3H_2`

SOLUTION :`2AsH_3 to 2As+3H_2`
Discussion
14421.

What is the oxidation states of phosphorus in the following : (i) H_(3)PO_(3) (ii) PCl_(3) (iii) Ca_(3)P_(2) (iv) Na_(3)PO_(4) (v) POF_(3) ?

Answer»

SOLUTION :(i) Let the oxidation state of P be x.
`{:((i),overset(+1)(H_(3))overset(x)(P)overset(-2)(O_(3))" "therefore" "3(+1)+x+3(-2)=0 or x = +3,(ii),overset(x)(P)overset(-1)(Cl_(3))" "therefore" "x+3(-1)=0 or x = +3),((iii),overset(+2)(Ca_(3))overset(x)(P_(2))""therefore" "3(+2)+2 xx x = 0 or x = -3,(iv),overset(+1)(Na_(3))overset(x)(P)overset(-2)(O_(4))" "therefore""3(+1)+x+4(-2)=0 or x = +5),((V),overset(x)(P)overset(-2)(O)overset(-1)(F_(3))" "therefore" "x + 1 (-2)+3(-1)=0 or x = +5,,):}`
Discussion
14422.

Which of the following expression represents correctly the variation of density of an ideal gas with change in temperature ?

Answer»

<P>`d_(2) =(p_(2) T_(1) d_(1))/( p_(1) T_(2))`
`d_(2) = ( d_(1) T_(1))/( T_(2))`
`d_(2) = ( d_(1) T_(2))/( T_(1))`
`d_(2) = ( p _(1) p _(2) T_(2))/( p_(1) T_(1))`

ANSWER :A
Discussion
14423.

What fraction of a reactant showing first order remains after 40 miute if t_(1//2) is 20 minute ?

Answer»

`1//4`
`1//2`
`1//8`
`1//6`

Solution :`[A]_t/[A]_0= 1/2^N " and Half lives "n = 1/t_(1//2)= 40/ 20 =2 `
`:. [A]_t= [A]_0/2=[A]_0/4= 1/4`
Discussion
14424.

When ketones are undergo oxidation, the C-C bond is cleaved. When a strong oxidising agent is used to oxidise 2,5 - dimethyl hexan - 3 - one mention the products with their names.

Answer»

SOLUTION :
Discussion
14425.

Which characteristic is not correct about H_(2)SO_(4)?

Answer»

REDUCING agent
Oxidising agent
Sulphonating agent
HIGHLY VISCOUS

Solution :`H_2SO_4`is oxidising agent and not reducing agent.
Discussion
14426.

Which among the following structure represents sym-trichlorobenzene?

Answer»




ANSWER :B
Discussion
14427.

The statement true for N_(3)^(-) is

Answer»

it has a non linear structure
it is called pseudohalogen
the formal oxidition STATE of nitrogen in this anion is -1
it is ISOELECTRONIC with `NO_(2)`

SOLUTION :AZIDE ion is linear. It is a pseudohalide ion. The formal OXIDATION state of N in `N_(3)^(-)` ion is -1 because in any of the resonating structure, the net charge on the ion is -1.
Discussion
14428.

What is the correct order of reactivity of alcohols in the following reaction ? R- OH+ HCl overset(ZnCl_(2))to R- Cl+ H_(2)O

Answer»

`1^(@) gt 2^(@) gt 3^(@)`
`1^(@) lt 2^(@) gt 3^(@)`
`3^(@) gt 2^(@) gt 1^(@)`
`3^(@) gt 1^(@) gt 2^(@)`

Solution :The reaction proceeds through formation of carbo-cation intermediate. As tertiary CARBOCATION is most STABLE , the tertiary ALCOHOLS is most readily reacted.
Discussion
14429.

What is the product formed when acctonc is treated with LiAlH_4 and H_2O ?

Answer»

ISOBUTYL alcohol
n-butyl alcohol
Propan-2-ol
Propan-1-ol

SOLUTION :Propan-2-ol
Discussion
14430.

Writeequationsto from (i) Nylon 6 (ii) Nylon 6,6.

Answer»

SOLUTION :NYLON 6and Nylon6,6 are PREPAREDAS under :
(i) Nylon 6.

(II) Nylon 6,6 .
Discussion
14431.

Which ligand is expected to be bidentate:

Answer»

`C_2O_4^(2-)`<BR>`CH_3C-=N`
`Br^-`
`CH_3NH_2`

ANSWER :A
Discussion
14432.

Which of the following dissolves in water but does not give any oxyacid solution ?

Answer»

`SO_(2)`
`OF_(2)`
`SCl_(4)`
`SO_(3)`

ANSWER :B
Discussion
14433.

Which are mild tranquilizers which relieve tension ?

Answer»

Chlorodiazopoxide
Meprobamate 
(A) and (B) both 
Nebutal 

SOLUTION :(A) and (B) both
Discussion
14434.

What will be the pOH of a neutral solution at 50^(@)C if its pK_(w) is 13.38 at 50^(@)C.

Answer»

`6.6`
`7.0`
`6.69`
`7.31`

ANSWER :C
Discussion
14435.

The reagent with which both aldehyde and ketone react easily is :

Answer»

Fehling's solution
GRIGNARD reagent
SCHIFF's reagent
Tollen's reagent

ANSWER :B
Discussion
14436.

Which one is not a process of purification of metals:

Answer»

chromatrography
ZONE refining
froth FLOATATION
DISTILLATION

ANSWER :C
Discussion
14437.

Which orbital has two angular nodal planes?

Answer»

2s
2p
3d
4f

Answer :C
Discussion
14438.

The transition metal ion that has 'spin-only' magnetic moment value of 5.96 is

Answer»

`Mn^(2+)`
`Fe^(2+)`
`V^(2+)`
`Cu^(2+)`

Solution :`Mn^(2+)` ION has the electronic configuration `3d^(5) 4s^(0)`.
No. of unpaired ELECTRONS = 5
`mu_(s) = sqrt(n(n+2))`
` = sqrt(5(5 +2)) = sqrt(35)` = 5.92 BM
Discussion
14439.

What happens when methyl cyanide is partially hydrolysed by cold conc.HCI?

Answer»

Solution :Partially hydrolysis of ALKYL cyanide with COLD, conc.HCl gives acid amide.
`underset("METHYL cyanide")(CH_3-C -= N ) underset(H_2O//OH)overset(conc.HCl)(to) underset("ACETAMIDE")(CH_3- undersetoverset(||)(O)(C ) - NH_2) `
Discussion
14440.

What are the percentages of carbon in pig iron and cast iron?

Answer»

SOLUTION :Pig IRON `-4% C`
CAST iron `-3%C`.
Discussion
14441.

The species which use sp^2-hybrid orbitals in its bonding:

Answer»

`PH_3`
`NH_3`
`CH_3^+`
`CH_4`

ANSWER :C
Discussion
14442.

Which of the following cations will have minimum flocculation value for arsenic sulphide sol?

Answer»

`Na ^(+)`
`Mg^(2+)`
`Ca ^(2+)`
`Al ^(3+)`

Solution :Larger is the valency, BETTER is the COAGULATION POWER of electrolyte, smaller is the FLOCCULATION VALUE.
Discussion
14443.

Which of the following compounds will create electron at ortho and para greater than

Answer»




Solution :`-CH_(3),-OH` and `-NH_(2)`are electron donating GROUP so, they INCREASE electron density at ortho and para position.
Discussion
14444.

Which among the following detergents is non-ionic in character?

Answer»

Sodiumlauryl SULPHATE
Pentaerythrityl STERATE
Cetytrimethyl AMMONIUM chloride
SODIUM n-dodecyl benzene sulphonate

Solution :Pentaerylthirtyl stearate is non-ionic DETERGENT.
Discussion
14445.

The role of calcination in metallurgical operation is

Answer»

To REMOVE moisture
To DECOMPOSE carbonate
To oxidise sulphates
To remove organic matter.

Solution :On account of the vary diffused shapes of f - orbitals, 54 f electrons SHIELD each other quite POORLY from the NUCLEAR charge.
Discussion
14446.

Which of the following is derivatives of srcrose

Answer»

alitame
sucrulose
Aspartame
saccharin

Answer :B
Discussion
14447.

What happens when an optically pure (+)-1-chlorenthylbenzne (C_(6)H_(5)CHCICH_(3)) is treated with SbCI_(5)?

Answer»

It FORMS `1-`pheny`1`ethene as the SOLE product
If propduces `(-)-1-`chloreothy`1`benzene
If REMAINS unchanged
If recemizes

Solution :Due to the FORMATION of carboncation:
Discussion
14448.

Which of the following statements regarding them anufacture of H_2SO_4 by Contact process is not true ?

Answer»

Sulphur is burnt in air to form `SO_2`
`SO_2` is catalytically oxidised to `SO_3`
`SO_3` is dissolved in water to get 100% sulphuric ACID
`H_2SO_4` OBTAINED by Contact PROCESS is of higher purity than that obtained by lead chamber process.

Answer :C
Discussion
14449.

Write the IUPAC Name of theK_4 [Ni(CN)_4]

Answer»

SOLUTION :(i) POTASSIUM TETRA cyanonlickelate (0)
OR
Potassium tetra cyanonickel (0)
Discussion
14450.

Which of the following cannot be prepared from benzene diazonium halide ?

Answer»

CHLOROBENZENE
FLUOROBENZENE
IODOBENZENE
NONE of these

ANSWER :D
Discussion