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7651.

Which of the following complex ion is not expected to absorb visible light ?

Answer»

`[NI(CN)_4]^(2-)`
`[Cr(NH_3)_6]^(3+)`
`[FE(H_2O)_6]^(2+)`
`[Ni(H_2O)_6]^(2+)`

ANSWER :A
Discussion
7652.

Write the chemical equation for preparing sodium soap from glyceryl Oleate and glyceryl palmitate. Structural formulae of these compounds are given below. (i) (C_(15)H_(31)COO)_(3)C_(2)H_(5) - Glyceryl palmitate (ii) (C_(17)H_(32)COO)_(3)C_(2)H_(5) - Glyceryl oleate

Answer»

Solution :(i) `(C_(16)H_(31)COO)_(3)C_(3)H_(5) -` Glyceryl palmitate :

(ii) `(C_(17)H_(32)COO)_(3)C_(2)H_(5)=` Glyceryl OLEATE :
Discussion
7653.

What is type of charge on Agl colloidal sol formed when AgNO_3 is added to Kl solution ?

Answer»

Solution :NEGATIVELY charged SOL `AgI//I^(-)` is formed when `AgNO_3` solution is added to KI solution.
Discussion
7654.

Which of the following type of cubic lattic has maximum number of atoms per unit cell ?

Answer»

SIMPLE CUBIC
Body CENTRED cubic
Face centred cubic
All have same.

Solution :No. of atoms PER unit in simple cubic =1, body centred cubic=2, face centred cubic =4
Discussion
7655.

Which cycloalkane has the lowest heat of combustion per CH_2 group

Answer»

CYCLOPROPANE
Cyclobutane
Cyclopentane
Cyclohexane

Solution :In cyclopropane, the angle strain is maximum hence it is a highly strained MOLECULE and CONSEQUENTLY most unstable . The angle strain in cyclobutane is less than than in cyclopropane, hence cyclobutane is more stable than cyclopropane, hence cyclobutane is more stable than cyclopropane. This stability increases upto 6 membered rings, then decreases from 7 to 11 membered rings and from the 12 membered onwards attains the stability of 6 membered ring. Heat of combustion is a METHOD of measuring chemical stability . Hence cyclohenxane has the lowest heat of combustion per `-CH_2` group.
Discussion
7656.

Two moles of a nonvolatile solute are dissolved in 5 moles of water. The vapour pressure of the solute relative to that of water is

Answer»

<P>`2/5`
`2/7`
`4/7`
`5/7`

SOLUTION :`(P_(o)-P_(s))/(P_(o))=(2)/(2+5)=2/7`
`1-(P_(s))/(P_(o))=2/7`
`(P_(s))/(P_(o))=1-2/7=5/7`
Discussion
7657.

When measured against a standard calomel electrode, an electrode is found to have a standard reduction potential of 0.100 V. if standard reduction potential of calomel electrode is +0.244 V and it acts as anode, the standard electrode potential of the same electrode against standard hydrogen electrode will be

Answer»

`-0.144V`
`+0.100V`
`-0.344V`
`-0.100V`

SOLUTION :STANDARD electrode POTENTIAL is fixed quantity for a given electrode. Hence, its standard reduction potential against SHE will remain same VIZ. 0.100 V (EMF of the cell FORMED will change).
Discussion
7658.

Write structures of compounds A, B and C in each of the following reactions : (i) C_(6)H_(5)Br overset("Mg/dry ether")to A underset((b)H_(3)O)overset((b)CO_(2)(g))to B overset(PCl_(5)) to C (ii) CH_(3)CN overset((a)SnCl_(2)//HCl)underset((b)H_(3)O^(+)) to A overset("dil NaOH") to B overset(Delta) to C

Answer»

Solution :(i) `A = C_(6)H_(5)MgBr` (Phenyl magnesium bromide)
B= `C_(6)H_(5)COOH` (Benzoic ACID)
`C = C_(6)H_(5)COCL` (BENZOYL chloride)
(ii) `A = CH_(3)CHO`
`B = CH_(3) - UNDERSET(OH)underset(|)CH-CH_(2)-CHO` (Aldol)
`C =CH_(3)-CH - CHO` (But-2-enal)
Discussion
7659.

Which series of elements have nearly same atomic radi?

Answer»

Fe,Co,Ni
Na,K,Rb
Li,Be,Mg
F,CL,Br

Solution :Variation in size in transition ELEMENTS is very SMALL. Hence, (A) is the correct ANSWER.
Discussion
7660.

The standard electrodepotential of the htwo half cells are given below Ni^(+2) + 2e^(-) to Ni , E^(@) = -0.25 V , Zn^(+2) + 2e^(-) to Zn , E^(0) = -0.77 V The voltage of cell formed by combining the two half cells would be

Answer»

`-1.02`
`+0.52` VOLT
`+1.02` volt
`-0.52` volt

Answer :B
Discussion
7661.

Which of the following is not an example of antacid?

Answer»

Histamine
cimetidine
RANITIDINE
ERYTHROMYCIN

Solution :erythromycin
Discussion
7662.

The reducing agent used in Clemmensen reduction is..........

Answer»

SOLUTION :ZN + HG / conc.HCI
Discussion
7663.

What is strong electrolyte ? Explain relation between molar conductivity and concentration of solution with strong electrolyte.

Answer»

Solution :* (a) Strong electrolyte : Electrolytes which gives maximum ionization in its aqueous solution are known as strong electrolyte.
* Conductivity of solution having strong electrolyte is more. For e.g. KCL, NaCl, `KNO_(3), NaNO_(3),MgCl_(2),CaCl_(2),MgSO_(4)` etc. Salts of strong ACID and base are strong electrolyte.
* (b) Concentration of solution and value of `Lamda_(m)`: for strong electrolytes, `Lamda_(m)` increases slowly with dilution and can be REPRESENTED by the equation.
`Lamda_(m)=Lamda_(m)^(@)-A c^(1//2)`
Where, `Lamda_(m)=`molar conductivity of strong electrolyte.
`Lamda_(m)^(@)`=LIMITING molar conductivity of strong electrolyte.
`Lamda_(m)^(@)`=limiting molar conductivity of strong electrolyte.
c=molar conductivity of solution in mol `L^(-1)`

* Where, A=constant=negative slope of graph.

* Value of A depends on : (i) type of electrolyte
(+ve and -ve IONS) like 1-1, 1-1, 2-1, 2-2
etc. (ii) temperature and (iii) pressure.
* Value of `Lamda_(m)` is same for same type of all electrolyte.
Discussion
7664.

Which of he following statement is//are true. (1) The reaction of methyl magnesium bromide with acetone followed by hdrolysis gives secondary also (2) Aldehydes are more reactive than ketones. (3) The yield of ketone, when a secondary alcohol is oxidised, is more than the yield of aldehyde when primary alcohol is oxidised by K_(2)Cr_(2)O_(7)//H^(o+) (4) Both aldehydes and ketones reduce Tollen's reagent.

Answer»

1
2
3
4

Answer :B::C
Discussion
7665.

Which of the following is/are paramagnetic complex(es)?

Answer»

`[FE(NH_(3))_(6)]^(2+)`
`[Co(H_(2)O)_(6)]^(3+)`
`[Fe(CO)_(5)]`
`[Co(NH_(3))_(6)]^(2+)`

Solution :(a) `t_(2g)^(2,1,1)e_(g)^(1,1)`
(d) `SP^(3)d^(2)` with u.p.`E^(-)` in 3d.
Discussion
7666.

Which of the following values of heat of formation indicates that the product is least stable ?

Answer»

`-94 KCAL`
`-231.6 kcal`
`+21.4 kcal`
`+64.8 KJ`

ANSWER :D
Discussion
7667.

The ultimate environmental hazard to mankind is

Answer»

NOISE pollution
Water pollution
Air pollution
Nuclear pollution

Answer :D
Discussion
7668.

Which of the following reagent can be used to convert benzene diazonium chloride to phenol?

Answer»

`H_3PO_4`
`DIL``H_2SO_4`
`H_2O`
all of these

Answer :4
Discussion
7669.

Which acts as a promoter for nickel in the hydrogen nation of oils?

Answer»

Cu
Mo
Fe
Pt

Answer :A
Discussion
7670.

The thermal decomposition of N_(2)O_(5) occues as: 2N_(2)O_(5) rarr 4NO_(2)+O_(2) Experimental studies suggest that rate of decomposition of N_(2)O_(5) rate of formation of NO_(2) or rate of formation of O_(2) all becomes double if concentration of N_(2)O_(5) is doubled. The container of 2 litre contains 4 moles of N_(2)O_(5) On heating to 100^(@) C N_(2)O_(5) undergo complete dissociation to NO_(2) and O_(2) Select the correct options if rate constant for decomposition of N_(2)O_(5) is 6.2xx10^(-4) sec^(-1) (P) Total mole ratio before and after dissociation is 4:2 (Q) Half-life of N_(2)O_(5) is 1117 sec and it is independent of temperature (R) Time required to complete 40% of reaction is 824 sec (S) If volume of container is doubled the ratio of decomposition becomes half of the initial rate:

Answer»

<P>P,R,S
P,Q,R,S
R,S
Q,R,S

Answer :C
Discussion
7671.

Which of the following antiseptic is a carbohydrate ? A) Streptomycin B) Gentamycin C)Neomycin

Answer»

Direct CONVERSION of starch into GLUCOSE may be carried out by
fermentation with DIASTASE
fermentation with zymase
heating it with dil HCI

ANSWER :D
Discussion
7672.

x gm of CaCO_(3), was completely burnt in air. The weight of the the solid residue formed is 28g. What is the value of 'x' in grams?

Answer»

44
200
150
50

Answer :D
Discussion
7673.

The thermal decomposition of N_(2)O_(5) occues as: 2N_(2)O_(5) rarr 4NO_(2)+O_(2) Experimental studies suggest that rate of decomposition of N_(2)O_(5) rate of formation of NO_(2) or rate of formation of O_(2) all becomes double if concentration of N_(2)O_(5) is doubled. If rate constants for decomposition of N_(2)O_(5) formation of NO_(2) and O_(2) are k_(1),k_(2) and k_(3) respectively, then:

Answer»

`k_(1)=k_(2)=k_(3)`
`2k_(1)=k_(2)=4k_(3)`
`k_(1)=2k_(2)=k_(3)`
`k_(1)=k_(2)=2k_(3)`

ANSWER :B
Discussion
7674.

The thermal decomposition of N_(2)O_(5) occues as: 2N_(2)O_(5) rarr 4NO_(2)+O_(2) Experimental studies suggest that rate of decomposition of N_(2)O_(5) rate of formation of NO_(2) or rate of formation of O_(2) all becomes double if concentration of N_(2)O_(5) is doubled. The correct mechanism for decomposition of N_(2)O_(5) is:

Answer»

`N_(2)O_(5) overset(slow)rarr NO_(2)+NO_(3)`
`N_(2)O_(5)+NO_(3) overset(fast)rarr 3NO_(2)+O_(2)`
`N_(2)O_(5) overset(fast)rarr NO_(2)+NO_(3)`
`N_(2)O_(5)+NO_(3) overset(slow)rarr 3NO_(2)+O_(2)`
`N_(2)O_(5) overset(fast)rarr 2NO_(2)+1/2O_(2)`
`N_(2)O_(5) overset(slow)rarr NO+NO_(2)+2O_(2)`
`N_(2)O_(5)+NO_(2)overset(fast)rarr 3NO_(2)+1/2O_(2)`

Answer :A
Discussion
7675.

Which of the following is the alloy of Sn ?

Answer»

BRONZE 
Brass 
GERMAN Silver 
STAINLESS STEEL 

Answer :A
Discussion
7676.

The unit of rate and rate constant are same for a:

Answer»

ZERO ORDER reaction
First order reaction
Second order reaction
Third order reaction

Answer :A
Discussion
7677.

Which isotope is used as moderator in nuclear reactors?

Answer»

`""^(10)B_(5)`
`""^(12)C_(6)`
`""^(4)He_(2)`
`""^(40)Ca_(20)`

Answer :A
Discussion
7678.

Which of following in the strongest acid ?

Answer»

`ClO_(3)(OH)`
`ClO_(2)(OH)`
`SO(OH)_(2)`
`SO_(2)(OH)_(2)`

Solution :`CIO_3(OH) or HCIO_4`, is the known strongest acid, Acid STRENGTH depends upon the oxidation state and the ELECTRONEGATIVITY of the central atom. In `ClO_3(OH),` the chlorins atom is in its highest oxidation state. `CIO_3(OH)` is stronger acid than `SO_2(OH)_2`, because Cl is in HIGHER oxidation state (+7) and also chlorine is more electronegative than sulphur.
Discussion
7679.

Which of the following , upon treatment with tert-BuONa followed by addition of bromine water, fails to decolourise the colour of bromine ?

Answer»




ANSWER :D
Discussion
7680.

What do you mean by Hormone ?

Answer»


Answer :HORMONES are the chemical substances PRODUCE by the different glands in the BODY, CARRIED to different parts of the body and responsible for biological ACTIVITIES.
Discussion
7681.

Which of the following is likely to highest melting point

Answer»

ACETONE
Butanone
2-pentanone
3-pentanone

Solution :Melting POINT ` alpha ` massifmassthenmeltingpoint`alpha =(1)/( "BRANCHES ") implies `- pentanone` alpha` symmetry
Discussion
7682.

Which one of the following has maximum bond dissociation energy ?

Answer»

O - O
C -C
N -N
F -F

Solution :Out of the given four choices, C-C BOND has the highest bond dissociation ENERGY.
Discussion
7683.

The solubility of a solid in a liquid remains unaffected by change of temperature.

Answer»

SOLUTION :FALSE, it CHANGES
Discussion
7684.

Which of the following is not a characteristic of chemisorption?

Answer»

Adsorption is IRREVERSIBLE
`DELTA H` is of the order of 40 kJ
Adsorption is specific
Adsorption increases with increase of surface AREA

ANSWER :B
Discussion
7685.

Which of the following statements is correct:

Answer»

IP of `X_((G))gtE.A` of `X_((g))`
IP of `X_((g))gtIP` of `X_((g))`
IP of `X_((g))^(+)IP` of `X_((g))`
All are CORRECT.

ANSWER :D
Discussion
7686.

What is semi-permeable membrane ?

Answer»

Solution :Continuous sheets or films (natural or SYNTHETIC) which contain a network of submicroscopicholes or pores through which SMALL solvent molecules LIKE water can PASS, but the PASSAGE of bigger molecules of solute is hindered, are known as semi-permeable membrane.
Discussion
7687.

What is the molality of 2.05 molar aqueous solution of acetic acid ? The density of solution is 1.02 gram/mL.

Answer»

1.14 M
3.28 M
2.28 M
0.44 M

SOLUTION :`M=2.05 M, d=1.02, M_(1)=60 g//mol`
`m =(1000 M)/(1000d-MM_(1))=(1000xx2.05)/(1000xx1.02-(2.05xx60))`
= 2.28 M.
Discussion
7688.

Which of the following is not essential amino acid

Answer»

VALINE
Lysine
Histidine
GLYCINE

ANSWER :D
Discussion
7689.

Thiosulphate ion (S_(2)O_(3)^(2-)) on acidification changes to SO_(2) along the precipitation of sulpur, .^(35)S^(32) SO_(3)^(2-) + 2H^(+) to H_(2)O + SO_(2) + S Which is the correct statement?

Answer»

`S^(35)` is in SULPHUR
`S^(35)` is in `SO_(2)`
`S^(35)` is in both
`S^(35)` is in none

Answer :a
Discussion
7690.

Unacceptable name for a compound containing one-OH group attached to benzene nucleus would be-

Answer»

CARBOLIC acid
Hydroxybenzene
Catechol
Phenol

Solution :
Discussion
7691.

When a bomb calorimeter is sued to determine the heat of reaction, which proper

Answer»


ANSWER :D
Discussion
7692.

Which are the correct statements ?

Answer»

`CHCI_(3)+c CI_(4)`-ENDOTHERMIC SOLUTION ?
Acetoc acid + Pyridine - Hot solution
`HNO_(3)+"WATER - Endothermic solution "`
Water + HI - Minimum boiling point azetrope

Solution :(a,b) are both CORRECT answer.
Discussion
7693.

What is Schottky defect ?

Answer»

Solution :MISSING of equal NUMBER of CATIONS and anions from the crystal lattice is CALLED Schottky defect.
Discussion
7694.

Which substance eliminates bromine from KBr solution

Answer»

`I_(2)`
`Cl_(2)`
`HI`
`SO_(2)`

ANSWER :B
Discussion
7695.

What happens when gelatin is added to a silver sol?

Answer»

SOLUTION :The STABILITY of SILVER SOL INCREASES
Discussion
7696.

Which noble gas has lowest boiling point?

Answer»

`He`
`NE`
`AR`
`KR.`

ANSWER :A
Discussion
7697.

Which of the following is called hyphone?

Answer»

`CH_3-undersetoverset(||)(O)(C ) -C_6H_5`
`C_6H_5-undersetoverset(||)(O)(C ) -C_6H_5`
`CH_3 - undersetoverset(||)(O)(C ) - CH_3`
`CH_3CHO`

SOLUTION :`CH_3-undersetoverset(||)(O)(C ) -C_6H_5`
Discussion
7698.

The standard Gibbs energy change at 300K for the reaction 2AhArrB+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=8.314JK//"mol"e=2.718)

Answer»

FORWARD diraction because `QgtK_(C)`
REVERSE direction because `QgtK_(C)`
Forward directin because `QltK_(C)`
Reverse direction because `QltK_(C)`

Solution :`DeltaG=DeltaG^(@)+RT LN Q`
`=2494.2+8.314xx300ln4`
= positive
`DeltaG=RTln""Q/K`
Since, `DeltaG` is positive so, `QGTK,` so REACTION shifts in reverse direction.
Discussion
7699.

What is Popoff's Rule ?

Answer»

Solution :During oxidation of unsymmetrical KETONES, the cleavage TAKES PLACE in such a WAY that CARBONYL group is retained by smaller alkyl group.
Discussion
7700.

The stability of interhalogen compounds follows the order :

Answer»

`IF_(3) gt BrF_(3) gt ClF_(3)`
`BrF_(3) gt IF_(3) gt ClF_(3)`
`ClF_(3) gt BrF_(3) gt IF_(3)`
`ClF_(3) gt IF_(3) gt BrF_(3)`

SOLUTION :The STABILITY of INTERHALOGENS increasesas the size difference and polarity of bond increases. Thus, the CORRECT order of stability is `IF_(3) gt BrF_(3) gt ClF_(3)`.
Discussion