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20201.

Waxes are long chain compounds belongingto the class:

Answer»

Acids
Alcohols
ESTERS
Ethers

Answer :C
Discussion
20202.

Which of the following is the correct electron dot structure of N_(2)O molecule?

Answer»




SOLUTION :
Discussion
20203.

Whichmetalis presentin Vitamin B_(12)?

Answer»

Ca (II)
ZN (II)
FE (II)
Co (III)

ANSWER :D
Discussion
20204.

Which of the following have lowest boiling point ?

Answer»

He
Ne
Ar
Na

Answer :A
Discussion
20205.

When H_3BO_3 is strongly heated, __________ is finallyobtained.

Answer»

SOLUTION :`B_2O_3` (BORON TRIOXIDE)
Discussion
20206.

When a buffer solution of CH_(3)COOH and CH_(3)COONaisdiluted withwater

Answer»

`CH_(3)COO^(-)`ION concentration increases
`H^(+)`ion concentration increases
`OH^(-)`ion concentration increases
`H^(+)`ion concentration does not CHANGE

Answer :D
Discussion
20207.

The units of rate constant for first order equation.

Answer»

`s^-1`
`MOL L^-1s^-1`
`L^-1`
`L^-1s^-1`

ANSWER :A
Discussion
20208.

The solubility product of iron (III) hydroxide is 1.6xx10^(-39). If x is the solubilityof iron (III) hydroxide, then which of the following expressions can be used to calculate x ?

Answer»

`K_(sp)=x^(4)`
`K_(sp)=9x^(4)`
`K_(sp)=27X^(3)`
`K_(sp)=27x^(4)`

Solution :`FE(OH)_(3)hArr underset(x)(Fe^(3+))+underset(3X)(3OH^(-))`
`K_(sp)=(x)(3x)^(3)=27 x^(4)`.
Discussion
20209.

Which products are expected from the disproportionation reaction of hypochlorous acid?

Answer»

`HCIO_(3) and CI_(2)O`
`HCIO_(2) and HCIO_(4)`
`HCI and CI_(2)O`
`HCI and HCIO_(3)`

Solution :`3 OVERSET(+1)(HClO) rarr 2 overset(-1)(HCL) + overset(+5)(HClO_(3))`
Discussion
20210.

What are the different types of complexes ?

Answer»

Solution :There are three types of complexes:(i) Cationic complexes: These are the complexes in which the complex ion carries a NET positive charge.
Example: `[NI(NH_3)_6]^(2+),[Cr(NH_3)_6]^(3+)` ETC,
(ii) (ii) Anionic complexes: These are the complexes in which the complex ion carries a net negative charge. Example: `[FE(CN)_6]^(4-),[Fe(CN_6)]^(3-)` etc.
(iii) Neutral complexes: These are. the complexes which do not yield opposite charge ions in SOLUTIONS. Example: `[Fe(CO_4)],[CO,Cl_C(NH_3)]` etc.
Discussion
20211.

What is meant by auto ionisation of water?

Answer»

Solution :Pure WATER has a little tendency to dissociate i.e., ONE water molecule DONATES a proton to ANOTHER water molecule. This is know as AUTO ionisation of water.
Discussion
20212.

which of the following series belong to the visible region of emission spectra?

Answer»

Lyman
Paschen
Balmor
Bracket

Answer :C
Discussion
20213.

Which of the following is an ionic compound ?

Answer»

ONE molecular orbital
TWO molecular orbitals
Two bonding molecular orbitals
Two antibonding molecular orbitals

Answer :B
Discussion
20214.

Which of the following can act as bridging ligands?

Answer»

`OH^(-)`
`H_(2)O`
CO
`Cl^(-)`

SOLUTION :small ligands, can ACT as bridging ligands.
Discussion
20215.

Which equation relates the cell potential and the concentration of the species involved in an electro chemical reaction?

Answer»

Henderson equation
ARRHENIUS equation
DEBYE Huckel Onsagar equation
Nernst equation

ANSWER :D
Discussion
20216.

which of the following anions are easilyremoved from aqueous solution by precipitation ?

Answer»

`CI^(Θ)`
`SO_(4)^(2-)`
`NO_(3)^(Θ)`
`CO_(3)^(2-)`

Solution :Nitrates of all the metals are water soluble and cannot be PRECIPITATE
Discussion
20217.

Which monomer is used to preparation orlon ?

Answer»

`CF_(2)=CF_(2)`
`CH_(2) = CH – CN`
`CH_(2) = CHCl`
`CH_(2) = CH-OH`

SOLUTION :`CH_(2) = CH – CN`
Discussion
20218.

The toal number of protons in 10g of calcium carbonate is

Answer»

`3.015xx10^(24)`
`1.5057xx10^(24)`
`2.0479xx10^(24)`
`4.0956xx10^(24)`

ANSWER :A
Discussion
20219.

Which can adsorb large volumes of hydrogen gas ?

Answer»

Colloidal solution of palladium
Finely DIVIDED nickel
Finely divided platinum
Colloidal `FE(OH)_3`

ANSWER :A
Discussion
20220.

The scientist Sheele first prepared Cl_(2)by heating Conc. HCl with

Answer»

SNO
`SiO_(2)`
`MnO_(2)`
`PbO_(2)`

Answer :C
Discussion
20221.

The reduction of R-COOH to R-CH_(2)OH can be effected by :

Answer»

sodium/alcohol
Zn/HCl
`LiAlH_(4)`
ALUMINIUM isoproxoide

Solution :`LiAlH_(4)` in ether REDUCES ACID to ALCOHOLS most effectively.
Discussion
20222.

The separation of landthanoids in ionexchange method is based on :

Answer»

BASICITY of the hydroxides
SIZE of the IONS
the solubility of their nitrates
oxidation state of the ion.

ANSWER :B
Discussion
20223.

The standard cell potential for the cell is , Zn|Zn^(2+)(1M)||Cu^(2+)(1M)|Cu [E^@ for Zn^(2+)//Zn=-0.76V, E^@ for Cu^(2+)//Cu=+0.34V]

Answer»

`-0.76+0.34=-0.42V`
`-0.34-(-0.76)=+0.42V`
`0.34-(-0.76)=+1.10V`
`-0.76-(+.34)=-1.10V`

ANSWER :C
Discussion
20224.

Which monosaccharide glucose units are present in sucrose and lactose ?

Answer»

Solution :`ALPHA`-D GLUCOSE and `beta`-D fructose are present in SUCROSE.
`beta`-D GALACTOSE and `alpha`-D glucose are present in lactose.
Discussion
20225.

When PCl_5 reacts with sulphuric acid sulphuryl chloride (SO_2Cl_2) is formed as the final product. This shows that sulphuric acid:

Answer»

Is a diabasic acid
Has great AFFINITY for water
Has TWO hydroxyl groups in its structure
Is a DERIVATIVE of sulphur dioxide

Answer :C
Discussion
20226.

Which of the following reagents reacts in same manner with HCHO, CH_3CHO, CH_3COCH_3:

Answer»

HCN
`NH_2OH`
`C_6H_5NHNH_2`
All

Answer :D
Discussion
20227.

Which one of the following pairs of substances could be used for the preparation of copper (II) sulphate in the laboratory?

Answer»

Copper and dilute SULPHURIC acid
Copper (II) CARBONATE and sodium sulphate
Copper (II) chloride and dilute sulphuric acid
Copper (II) OXIDE and dilute sulphuric acid

Answer :D
Discussion
20228.

Using a conductivity cell with "0.9 cm"^(-1) cell constant, the conductance was observed to be 2.5 xx 10^(-3)" mho for 0.07 M KCl" solution. What is the specific conductance of the solution ?

Answer»

SOLUTION :`2.25xx10^(-3)" MHO. CM"^(-1)`
Discussion
20229.

To produce difference between freezing point and boiling point of a solution by 105.0^(@)C, how much sucrose should be dissolved in 100 gm of water ?(K_(f)=1.86^(@)C, kg mol^(-1) " and " K_(b)=0.151^(@)Ckg mol^(-1))

Answer»

72 gm
34.2 gm
342 gm
460 gm

Solution :Boiling point `(T_(b))=100+Delta T_(b)`
`= 100+K_(b).m`
Freezing point `(T_(f))=0-Delta T_(f)=K_(f).m`
`therefore T_(b)-T_(f)=(100+K_(b).m)-(-K_(f).m)`
`105=100+0.151 m+1.86 m`
`2.37 m =5`
`m = (5)/(2.37)=2.11`
So, mass of sucrose to dissolve in 100 gm WATER is,
`= (2.11xx342xx100)/(1000)=72` gm.
Discussion
20230.

Which one of the following transition element has maximum oxidation state ?

Answer»

MANGANESE
COPPER
SCANDIUM
TITANIUM

ANSWER :A
Discussion
20231.

What is EDTA (Ethylendiamine tetraacetic add) ? Give one use.

Answer»

Solution :EDTA is a HEXADENTATE LIGAND. It HELPS to estimate HARDNESS of water.
Discussion
20232.

Which of the following is an appropriate set of eactants for the preparation of 1-methoxy-4 nitrobenzene. Why?

Answer»

SOLUTION :Reactants in set(II) is suitable and appropriate for the preparation of the product l-methoxy-4. NITROBENZENE but not those of set I. This is because aryl halides are very less REACTIVE in NUCLEOPHILIE substitution reaction
Discussion
20233.

Which of the following aqueous solutions has the highest freezing point ?

Answer»

0.1 molal `AI_(2)(SO_(4))_(3)`
0.1 molal `BaCI_(2)`
0.1 molal `AICI_(3)`
0.1 molal `NH_(4)CI`.

Solution :`DeltaT_(F)=ixxK_(f)xxm or DeltaT_(f)propi`
Thus, lower the value of I, lower is `DeltaT_(f)` and higher is the FREEZING point of the solution.
Since 'I' is LEAST (2) for `NH_(4)CI, DeltaT_(f) "for" NH_(4)CI` isalso minimum.
freezing point of NH_(4)CI solution is the maximuum.
Discussion
20234.

Whichofthefollowingreactionsoccur duringcalcination ?

Answer»

` CA CO _3toCa O+CO_ 2 `
`2 Fe S_2+(1)/(2) O_2toFe_2O_3 +4 SO_2`
`Al _2 O_3xH_ 2 OtoAl _ 2 O_3+xH_ 2O`
` ZNS +(3)/(2)O_2 toZnO+SO_2`

Answer :A::C
Discussion
20235.

Which type of drugs come under antimicrobial drugs ?

Answer»

SOLUTION :ANTISEPTICS, DISINFECTANTS, ANTIBIOTICS and sulpha DRUGS.
Discussion
20236.

Which one is least ionic?

Answer»

AgCl
KCI
`BaCl_2`
`KNO_3`

ANSWER :A
Discussion
20237.

The standard Gibbs energy change at 300 K for the reaction 2A hArr B +C is 2494.2J. At a given time, the composition of the reaction mixture is [A]=(1)/(2), [B]=2 and [C]=(1)/(2). The reaction proceeds in the : [R=8.314 J//K//"mol", e=2.718]

Answer»

forward DIRECTION because `Q lt K_(e )`
REVERSE direction because `Q lt K_(e )`
forward direction because `Q GT K_(e )`
reverse direction because `Q gt K_(e )`

Solution :`DeltaG^(@)=2494.2J`
`2A hArr B+C`
`R=8.314 J//K"mol"`.
e= 2.718
`[A]=(1)/(2), [B]=2, [C]=(1)/(2)`
`Q=([B][C])/([A]^(2))=(2xx1//2)/((1)/(2))^(2)=4`
`Delta G^(@)= - 2.303 " RT LOG " K_(e)`
`2494.2J= - 2.303xx(8.314 J//K//"mol")xx(300K)log K_(e )`
`implies " log " K_(e )= -(2494.2 J)/(2.303xx8.314 J//K//"mol" xx300K)`
`implies log K_(e )= -0.4341`
`K_(e )=0.37`
`Q gt K_(e )`
Discussion
20238.

Which of the structures given below are chiral ?

Answer»

I,II,III
II,III,V
II,III
I,II

Solution :I & IV have P.O.S. so are inactive while II,III,& V are iptically active. (P.O.S.= plane of SYMMETRY.)
Discussion
20239.

which of thefollowinglanthanoid ions is diamagnetic ?

Answer»

`EU^(2+)`
`YB^(2+)`
`CE^(2+)`
`Sm^(2+)`

Answer :B
Discussion
20240.

Which one is used to prepare unbreakable

Answer»

TEFLON
ORLON
HDP
LDP

Solution :HDP
Discussion
20241.

What are the factors on which cell potential depends?

Answer»

Solution :The CELL VOLTAGE DEPENDS on the nature of the electrodes, the concentration of the ELECTROLYTES and the temperature at which the cell is operated.
Discussion
20242.

Whate are the examples of first order reaction ?

Answer»

Solution :(i) Decompostion of DINITROGEN pentoxide
`N_2O_(5(G))rarr2NO_(2(g))+1//2O_(2(g))`
(II) Decompostion of thionylchoride
`SO_2Cl_(2(g))rarrSO_(2(g))+Cl_(2(g))`
(iii) Decomposition of `H_2O_2` in aqueous solution
`H_2O_(2_((aq)))rarrH_2O_((l))+1//2O_(2(g))`
(iv) Isomerisation of CYCLOPROPANE to propene
Discussion
20243.

Write Howorth structure of ''Lactose''.

Answer»

SOLUTION :
Discussion
20244.

Which of the following compounds shows the presence of intramolecular hydrogen bond

Answer»

Concentrated acetic ACID
`H_(2)O_(2)`
HCN
Cellulose

Solution :Cellulose is EXAMPLE of INTRAMOLECULAR H-bonding
Discussion
20245.

Which of the following compounds has isopropyl group

Answer»

2,2,3,3-tetramethylpentane
2,2-dimethylpentane
2,2,3-trimethylpentane
2-methylpentane

Answer :D
Discussion
20246.

What volume of water must be added to 500 ml NaOH to make 2% (w/v) NaOH

Answer»

`5000 mL`
`6000 mL`
`5500 mL`
`6500 mL`

Solution :MOLES of `NaOH = 0.5 xx 6 = 3` mole
`= 3 xx 40`
`= 120 gm`
`2% ((W)/(v)) NaOH`
`(120)/(V) xx 100 = 2`
`V = 6000 mL`
Volume added `= (6000 - 500) mL`
`= 5500 mL`
Discussion
20247.

Which of the following represents decreasing order of reactivity of given organic compounds towards nitration. (i) Terephthalic (ii) Toluene (iii) p-Toluic acid (iv) p-Xylene (v) m-Xylene

Answer»

`IV gt Vgt II gt III gt I`
`I gt IIGT III gt V gt IV`
`III gt IGT II gt V gt IV`
`V gt IVgt II gt III gt I`

ANSWER :D
Discussion
20248.

Which of the M^(4+) ion has more tendency to gain single electron ?

Answer»

`CE ^(4+)`
`DY ^(4+)`
`PR ^(4+)`
`ND^(4+)`

ANSWER :B
Discussion
20249.

Which of the following complexes follow Sidgwick EAN rule?

Answer»

`FE(eta^(5)-C_(5)H_(5))_(2)]`
`K[PtCl_(3)(eta^(2)-C_(2)H_(4))]`
`[V(CO)_(6)]`
`[MN(CO)_(6)]`

Answer :A
Discussion
20250.

Which of the following is not an example of +E effect:

Answer»

Hydrohalognation of Propene
Hydroboration of PROPYNE
FORMATION of acetaldehydecyanohydrine
HYDRATION of ethene

Answer :C
Discussion