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3551.

What will be the effect of temperature on a rate of a reaction?

Answer»

SOLUTION :When TEMPERATURE INCREASES RATE increases
Discussion
3552.

Which of the following comments are not true -

Answer»

if the same amount of electricity is PASSED through the solutions of ferrous SULPHATE and FERRIC sulphate with the same concentration, then the amount of iron to be deposited will be more in case of ferric sulphate solution
electrochemical equivalent `(ECE)=(E)/(F)`
1 mol of a substance is produced or dissolved by 1 F of electricity
a bulb of 60 W gives up an energy of 60 joule per second

Answer :A::C
Discussion
3553.

The vapour pressure of a solution having 2.0g of a solute X (molar mass 32 g mol^(-1)) in 100g of CS_(2) (vapour pressure 854 Torr) is 848.9 Torr. The molecular formula of the solute is

Answer»

X
`X_(2)`
`X_(4)`
`X_(8)`

ANSWER :D
Discussion
3554.

Which among the following is NOT a mineral of iron ?

Answer»

Haematite
Magnesite
Magnetite
Siderite

Answer :B
Discussion
3555.

To an inorganic mixture dil. H_(2)SO_(4) is added in cold, colourless, odourless gas is evolved. The mixture contains

Answer»

Sulphite
Acetate
NITRITE
Carbonate

Solution :Sulphide radical will GIVE a burning sulphur odour. Acetate radical will give a sweet, vinegar odour. Nitrite will give a REDDISH brown gas. Carbonate will give a COLOURLESS, odourless gas, i.e., `CO_(2)`.
Discussion
3556.

To prepare 0.1 M KMNO_4 solution in 250 ml flask the weight of KMNO_4 required is :

Answer»

4.80 g
3.95 g
39..5 g
0.48 g

Answer :B
Discussion
3557.

Twomoles of an idealgas (C_(V) = (5)/(2)R) was compressed adiabaticallyagainstconstantpressure of2 atm . Which wasinitiallyat 350 K and 1 atmpressure. Thework involve in theprocess is equalto.

Answer»

`250 R`
`300 R`
`400 R`
` 500 R`

Solution :`nC_(V)(T_(2)-T_(1)) = - P_(ext) xx nR [(T_(2))/(P_(2))-(T_(1))/(P_(1))]`
`T_(2) = (9)/(7) T_(1) RARR w = 2 xx (5)/(2) xx R [(9)/(7) T_(1)- T_(2)] = 500 R`
Discussion
3558.

What is the surface area of a cube having an edge length of 1 cm? What would be the total surface area of the same material if it were subdivided into colloidal size cubes each having an edge length of 10^(-7) cm ?

Answer»

Solution :Surface area of a cube `=6L ^(2)=6xx(1cm)^(2)=6cm^(2)`
VOLUME of cube of edge length `1 cm =l^(3)=1 cm^(3)`
Volume of cube of edge length `10^(-7)cm =(10^(-7))^(3)=10^(-21)cm^(3)`
`therefore` No. of smaller CUBES in big cube `=(1)/(10^(-21))=10^(21)`
Surface area of each smaller cube `=6l^(2)=6(10^(21))^(2)=6xx10^(-14)cm^(2)`
`therefore` Total surface area of all the smaller cuber `=(10^(21))XX(6xx10^(-14))cm^(2)=6xx10^(7)cm^(2)`
Discussion
3559.

What is the shape of Fe(CO)_(5) molecule ? Given that its dipole moment = 0.

Answer»

Tetrahedral
Octahedral
Trigonal bipyramidal
Square pyramidal

Answer :D
Discussion
3560.

When ammonia reacts with copper sulphate solution to give complex, the colour of complex is, ……………….. .

Answer»

voilet
DEEP BLUE
blue
Red

Solution :deep blue
Discussion
3561.

Which of the following compounds give racemic mixture in nucleophilic substitution reaction with H_2O

Answer»


`(CH_3)_3C-Br`

SOLUTION : Racemic MIXTURE is formed only if the alkyl HALIDE or SUBSTITUTED alkyl halide has chiral CENTRE
Discussion
3562.

Which of the following combination of statements is true regarding the interpretation of the atomicorbital? (a) An electron in an orbital of high angular momentum stays away from the nucleus than an electron on the orbital of lower angular momentum. (b) For a given value of the principal quantum number, the size of the orbit is universally proportional tothe azimuthal quantum number. (c) According to wave mechanics, the ground state angular momentum is equal to(h)/(2pi) (d) The plot ofvs r for various azimuthal quantum numbers, shows peak shifting towards higher r value.

Answer»

(a), (B)
(b), (C)
(a), (d)
(a), (c)

SOLUTION :FACT
Discussion
3563.

Which solution will have least vapour pressure?

Answer»

0.1 M `BaCl_(2)`
0.1 M UXA
0.1 M `Na_(2) SO_(4)`
0.1 M `Na_(3) PO_(4)`

ANSWER :D
Discussion
3564.

Write the IUPAC name of following complex:K_4[Fe(CN)_6]

Answer»

SOLUTION :POTASSIUM hexa-cyano FERRATE (H)
Discussion
3565.

Two liquids A and B boil at 145^@C and 190^@C , respectively. Which of them has a higher vapour pressure at 80^@C?

Answer»

SOLUTION :A being more VOLATILE has a HIGHER VAPOUR PRESSURE.
Discussion
3566.

What are primary and secondary batteries ? Give one example for each.

Answer»


ANSWER :
Discussion
3567.

The vapour pressure of pure benzene at a certain temperature is 640 mm Hg. A nonvolatile nonelctrolyte solid weighing 2.175g is added to 39g of benzene. The vapour pressure of the solution is 600mmHg. What is the molecular weight of the solid substance ?

Answer»

<P>

Solution :We know,
`(p^(0)-p)/(p^(0))=(n)/(n+N)`…………..(Eqn.1)
Given that `p^(0)=640mm, p=600mm`
`n=(2.175)/(M)`, `N=(39)/(78)` `(C_(6)H_(6)=78)`
(M is the mol. WT. of the solute)
`:.(640-600)/(640)=(2.175//M)/((2.175)/(M)+0.5)`, `M=65.25`
Discussion
3568.

Which of the following overlaps is incorrect? (Assuming z-axis to be the internuclear axis)

Answer»

`2p_y +2p_y` RIGHT ARROW `pi2p_y`
`2p_z + 2p_z` RIGHTARROW `sigma2p_z`
`2p_x + 2p_x rightarrow pi2p_x`
`1s +2p_y rightarrow pi(1s-2p_y) `

ANSWER :D
Discussion
3569.

Why are aquatic species more confortable in cold water in comparison to warm water ?

Answer»

Solution :It is note worthy that the values of Henry.s law constant `(K_(H))` increase with decrease of temeprature. It is due to this reason that at a given pressure the solubility of oxygen in water increases with decrease in temperature. THEREFORE, PRESENCE of more oxygen at lower temperature makes the aquatic SPECIES more confortable in COLD water in comparison to warm water.
Discussion
3570.

Which of the following compound will exhibit geometrical isomerism

Answer»

1-PHENYL-2-butene
3-Phenyl-1-butene
2-Phenyl-1-butene
1, 1-Diphenyl-1-propane

Solution :Molecules with RESTRICTED rotation and having TWO different groups on both restricted atoms can SHOW geometrical isomerism
1- Phenyl - 2 - butene (`Ph-CH_(2)-CH=CH-CH_(3))`
Discussion
3571.

The strategy of staying as far removed from the dominant power as possible is also known as ---------------.

Answer»

SOLUTION :HIDE STRATEGY
Discussion
3572.

Which factor is present in second order reaction?

Answer»

Time and concentration
Time and concentration of POWER two
Only time
Ony concentration

Solution :Rate=-`(d[R])/(DT)=k[A]^(2)`
Discussion
3573.

Which of the following molecule is planar as well as polar :

Answer»

`PCl_(3)`
`SF_(4)`
`ClF_(3)`
None of these

Answer :C
Discussion
3574.

Which of the following is not isomer of C_(5)H_(10)O?

Answer»

3- PENTANONE
2- Pentanone
Pentanal
3- ETHOXY propane

Answer :D
Discussion
3575.

Which of the followingin not biodegradable polymer ?

Answer»

DEXTRON
POLYETHENE
PVC
NYLON -6

Answer :A
Discussion
3576.

Which of the following alcohols is the strongest acid ?

Answer»

`CH_3OH`
`CH_3CH_2OH`
`(CH_3)_2CHCH_2OH`
`(CH_3)_3COH`

ANSWER :A
Discussion
3577.

Which of the followinghasmorepKbvalue ?

Answer»

`CH_(3) - NH_(2)`
`C_(2)H_(5) - NH_(2)`
`CL - CH_(2) - NH_(2)`
`HO-CH_(2) - NH_(2)`

SOLUTION : Morethe Pkbvalueless the basicity . The - Clatomis electron withdrawingwhichdecreasethebasicityof amine .
Discussion
3578.

Which one of the following is the first member of monosaccharide

Answer»

`CH_(2)CH-OVERSET(O)overset(||)(C)-CH_(2)OH `
`CH_(2)OH-CHOH -CHO`
`CH_(2)OH-CHOH -CHOH-CHO`
`CH_(2)OH-CHOH-overset(O)overset(||)(C)-CH_(2)OH`

Solution :Glyceradehyde is FIRST MONOSACCHARIDES CARBOHYDRATE.
Discussion
3579.

Which one of the following is Retinol ?

Answer»

Vitamin A 
Vitamin C 
Vitamin `B_(1)` 
Vitamin `B_(6)`

ANSWER :A
Discussion
3580.

Which of the following ions can be polarized more as compared to other ions ?

Answer»

`I^(-)` <BR>`Br^(-)`
`Cl^(-)`
`F^(-)`

SOLUTION :LARGER anion can be POLARISED more.
Discussion
3581.

Which of the following oxyacid(s) has/have same hybridisation state for underlined atoms?

Answer»

`H_(2)S_(2)O_(8)`
`H_(2)S_(2)O_(7)`
`H_(2)S_(2)O_(6)`
All of the above

ANSWER :D
Discussion
3582.

Which of the following paris has the same size ?

Answer»

`Zn^(2+), HF^(4+)`
`FE^(2+),Ni^(2+)`
`Zr^(4+),Ti^(4+)`
`Zr^(4+),Hf^(4+)`

Answer :d
Discussion
3583.

Which is most reactive for S_N1 reaction:

Answer»

`CH_3I`
`C_2H_5I`
`i-C_3H_7I`
`t-C_4H_9I`

ANSWER :A
Discussion
3584.

The standard potential of Cu | Cu^(2+) electrode is -0.34 V . It corresponds to the reaction

Answer»

`Cu to Cu^(2+) + 2 e^(-)`
`Cu^(2+) + 2e^(-) to Cu`
`Cu^(+) to Cu^(2+) + e^(-)`
`Cu to Cu^(+) - e^(-)`

Solution :`-ve` SRP , OXIDATION TAKE place .
Discussion
3585.

Write the two steps involved in the commercial process of converting MnO_(2) to potassium permanganate.

Answer»

SOLUTION :Commercially it is prepared by the ALKALINE oxidative FUSION of `MnO_(2)` following by the elctrolytic oxidation of manganate (VI)
`MnO_(2)overset("Fused with KOH")UNDERSET("Oxidised with air")rarr underset("Mangante ion")(MnO_(4)^(2-))`
`MnO_(4)^(2-) overset("Electrolytic oxidation")underset("alkaline solution")rarr underset("PER Mangante ion")(MnO_(4)^(-))`
Discussion
3586.

Which of the following elements have similar value of electronegativity ?

Answer»

<P>H
S
TE
P

ANSWER :A::C::D
Discussion
3587.

Which of the following reactions represent Deacon's process ?

Answer»

`4HCl+O_(2)overset(CuCl_(2))to2Cl_(2)+2H_(2)O`
`2H_(2)O+2Cl_(2)overset("SUNLIGHT")to4HCl+O_(2)`
`4NH_(3)+5O_(2)overset("Rh gauge")to4NO+6H_(2)O`
`2SO_(2)+O_(2)overset(V_(2)O_(5))to2SO_(3)`

ANSWER :A
Discussion
3588.

Two liquids A and B boil at 145^(@)C and 190^(@)C respectively. Which of them has higher vapour pressure at 80^(@)C ?

Answer»

Solution :Lower the BOILING point more volatile is the respective compound. THEREFORE, LIQUID A will have higher VAPOUR pressure at`80^(@) C`
Discussion
3589.

Which of the following is an example of orthorhombic crystal ?

Answer»

`CuSO_(4)`
`Na_(2)SO_(4)`
`BaSO_(4)`
`CaSO_(4)`

Answer :C
Discussion
3590.

Which of the following is artificial sweetning agent?

Answer»

Starch
Aspartame
Arneto
Caramel

ANSWER :B
Discussion
3591.

What role does adsorption play in heterogenous catalysis.

Answer»

Solution :In heterogenous catalysis, the molecules of the reactants are adsorbed onthe surface of catalyst.
The increased concentration of the reactants on the surface INFLUENCE the rate of reaction.
Adsorption being an EXOTHERMIC proces, the heat of adsorption is take by the REACTANT molecule to increase their CHEMICAL active
Discussion
3592.

Which pair of molecules are polar species ?

Answer»

`CO_(2) and H_(2)O`
`BF_(3) and PCl_(3)`
`SO_(2) and SCl_(2)`
`CS_(2) and SO_(3)`

Solution :The net polarity of ANGULAR molecules `SO_(2) and SCl_(2)` is not equal to zero.
Discussion
3593.

Weldon mud is:

Answer»

`MnO_2`
`MN(OH)_2`
`2CaO. MnO_2`
`Mn_2O_3`

ANSWER :C
Discussion
3594.

When propene is reacted with HBr in the presence of peroxide. The species first attack on propene is

Answer»

`BR^(+)`
`Br^(-)`
`H^(*)`
`Br^(*)`

ANSWER :B
Discussion
3595.

What is the chemical name of vitamin B_(1) ?

Answer»

RIBOFLAVIN
PYRIDOXINE
THIAMINE
`ALPHA`-Tocopherol

Solution :Thiamine
Discussion
3596.

Whatis thecompostion of rust ?

Answer»

`FeO+Fe(OH)_(2)`
`Fe_(2)O_(3)`
`Fe_(2)O_(3)+Fe_(OH)`
`Fe_(2)O_(3)` and `Fe(OH)_(3)`

SOLUTION :RUST is `Fe_(2) O_(3)` and `Fe(OH)_(3)`
Discussion
3597.

When chromite ore FeCr_(2)O_(4) is fused with NaOH in presence of air, a yellow coloured compound ( A) is obtained which on acidification with dilute sulphuric acid gives a compound ( B). Compound (B) on reaction with KCl forms an orange coloured crystalline compound (C) (i) Write the formulae of the compounds (A) , (B)and (C ) (ii) Write one use of compound (C ) .

Answer»

Solution :(i) `4FeCr_(2)O_(4) + 16 NaOH + 7O_(2) RARR underset("(A)(Sodium chromate")(8 Na_(2)CrO_(4))+ 2Fe_(2)O_(3)+ 8 H_(2)O`
`2Na_(2)CrO_(4) + H_(2)SO_(4) rarr underset("(B) Sodium dichromate")(Na_(2) Cr_(2)O_(7)) + Na_(2)SO_(4)+ H_(2)O`
`Na_(2)Cr_(2)O_(7) + 2KCl rarr underset("(C ) Potassium dichromate")( K_(2)Cr_(2) O_(7)) + 2NaCl`
(ii)Potassium dichromate is used as a powerful oxidizing agent in industriesand in the tanning of leather.
Discussion
3598.

When chlorine is passed through molten tin, the product obtained is:

Answer»

`SnCl_2`
`[SnCl_4]^(2-)`
`[SnCl_6]^(2-)`
`SnCl_4`

ANSWER :D
Discussion
3599.

What is the role of desorption in the process of catalysis?

Answer»


Answer :In HETEROGENEOUS CATALYSIS REACTANT molecules get adsorbed on the catalyst suface and reaction TAKES place at the surface of the catalyst. Desorption of the produces formed from the catalyst surface makes the surface of the catalyst free for FRESH adsorption of the reactants.
Discussion
3600.

We have three aqueous solutions of NaCl labelled as A, B and C with concentration 0.1 M , 0.01 "and" 0.001 M , respectively . The value of van't Hoff factor for these solutions will be in the order :

Answer»

`i_(A)lti_(B)lti_(C)`
`i_(A)gti_(B)gti_(C)`
`i_(A)=i_(B)=i_(C)`
`i_(A)lti_(B)gti_(C)`

Solution :is the CORRECT answer. Since NACI is a storng electrolyts `(alpha=1)`, the volueof Van't Hff FACTOR does not chage with the change in molar CONCENTRATION of NaCI. Therefore, `i_(A)=i_(B)=i_(B)`
Discussion