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3301.

The square planar complex of the type [M(xy)_(2)^(n+-) shows……….. Isomerism

Answer»


ANSWER :GEOMETRICAL (or) cis-trans
Discussion
3302.

Which of the following statements is not correct regarding hybridisation ?

Answer»

1. The hybridised orbitals are always equivalent in energy and shape
2. The hybrid orbitals are more effective in forming stable `SIGMA` - and `pi` - bonds than the pure atomic orbitals
3. Promotion is not ESSENTIAL condition prior to hybridisation
4. The filled orbitals can ALSO PARTICIPATE in hybridisation

Answer :B
Discussion
3303.

The vapour density of NH_4Cl is almost half the expected value because it :

Answer»

is SALT of a STRONG acid
Sublimes on heating
dissociates completely
none of these

Answer :C
Discussion
3304.

Which of the following has maximum extent of resonance?

Answer»

`R-overset(O)overset(||)(C)-Cl`
`R-overset(O)overset(||)(C)-O-overset(O)overset(||)(C)-R`
`R-overset(O)overset(||)(C)-OR`
`R-overset(O)overset(||)(C)-NH_(2)`

ANSWER :D
Discussion
3305.

Under ambient conditions, which among the following surfactants will form micelles in aqueous solution at lowest molar concentration ?

Answer»

`CH_(3)-(CH_(2))_(8)-COO^(-)Na^(+)`
`CH_(3)(CH_(2))_(11)OVERSET(o+)N (CH_(3))_(3)Br^(-)`
`CH_(3)-(CH_(2))_(13) - OSO_(3)^(-)Na^(+)`
`CH_(3)(CH_(2))_(15)overset(o+)N (CH_(3))_(3)Br^(-)`

Answer :D
Discussion
3306.

Which of the following is paramagnetic as well as coloured ?

Answer»

`SC^(3+)`
`Ti^(4+)`
`Cu^(2+)`
`Cu^(+)`

Solution :`Cu^(2+)` has `3D^(9)` one unpaired ELECTRON. Thus, coloured andparamagnetic.
Discussion
3307.

Which of the following is an addition polymer ?

Answer»

TERYLENE
Bakelite
Polyesters
Teflon

ANSWER :D
Discussion
3308.

Which are of the following is a case of adsoption ?

Answer»

Anhydrous `CaCl_(2)` in contact with water VAPOUR
Silica gel in contact with water vapours
Ammonia gas in contact with water
Cotton clothes DIPPED in a dye solution

Answer :B
Discussion
3309.

Write the cell reactions of the cell fored from Sn^(2+)//Sn, Pb^(2+)//Pb electrode E^(@)Sn^(2+)//Sn= -0.140V, E^(@)Pb^(2+)//Pb = -0.126V

Answer»


ANSWER :
Discussion
3310.

The test used to distinguish wish 1^(@), 2^(@) and 3^(@) alcohol is _________

Answer»

LUCAS TEST
VICTOR Meyer's
dehydrogenation
all the above

ANSWER :D
Discussion
3311.

Write IUPAC names of following compounds : (1) [Co(NH_(3))_(5)(CO_(3))]Cl (2) Hg[Co(SCN)_(4)] (3) [Pt(NH_(3))_(2)Cl(NO_(2))]

Answer»

SOLUTION :(1) Pentaamminecarbonatocobalt(III) chloride
(2) Mercury tetrathiocyanatocobaltate(III)
(3) Diamminechloridonitrito-N-platinum(II)
Discussion
3312.

When HgI_(2) is added in KI solution. The freezing point of solution:-

Answer»

increases
decreases
REMAINS unchanged
Can't predict

Answer :A
Discussion
3313.

Which one of the followingmetal having least chemical reactive?

Answer»

Na
Mg
Al
Au

Answer :D
Discussion
3314.

Which of the following reactions does not produce benzaldehyde as end of the product.

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(##ARH_EGN_PRG_CHE_C21_E03_007_O02.png" width="30%">
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SOLUTION :
Discussion
3315.

Which of the following halogens is least reactive towards alkanes in the presence of sunlight ?

Answer»

`F_(2)`
`Cl_(2)`
`Br_(2)`
`I_(2)`

Solution :IODINE is least reactive towards ALKANES.
Discussion
3316.

Which of the following will give aldchyde only?

Answer»

OZONOLYSIS of alkene
Rosenmund's reaction
Stephen's reaction
Hydration of alkyne.

Solution :(a) Alkene on ozonolysis GIVES a mixture of CARBONYL compound. It is 2-butene which gives acetaldehyde only.
(b) `R-overset(O)overset(||)C-Cl overset(H_(2) // Pd-BaSO_(4))to R-CH=O` (Rosenmund reduction)
(c) `R-C-=N underset(H^(+))overset(SnCl_(2) // HCl)to R-CH=NH underset(H^(+))overset(H_(2)O)to R-CH=O` (Stephen reaction)
Any alkyne except acetylene on hydration gives KETONE not aldehyde.
Discussion
3317.

Which of the following compounds is not an antacid

Answer»

ALUMINIUM hydroxide
Cimetidine
PHENELZINE
Ranitidine

Solution :Phenelzine is TRANQUILIZER. It is not an ANTACID.
Discussion
3318.

Which aerosols deplete ozone?

Answer»

Solution :CHLOROFLUOROCARBONS or FREONS, oxides of nitrogen and sulphur ETC. DEPLETE ozone as they react with it.
Discussion
3319.

Which compounds of Lanthanides are used in pigments?

Answer»

`Lu(OH)_(3)`
`CeO_(2)`
`TB(OH)_(3)`
`CE(OH)_(3)`

ANSWER :B
Discussion
3320.

When sugar is treated witn concentrated sulphuric acid, the sugar is charred. In this process sugar is:

Answer»

Oxidized
Dehydrated
Reduced
Sulphonated

Answer :B
Discussion
3321.

Vapours of an alcohol 'c' on passing over heated copper produce compound 'D'. 'D' on reaction with CH_3MgCl following by hydrolysis produces 2-methyl butan-2-o1. Write the name or structure of compounds 'C' and 'D'.

Answer»

SOLUTION :
Discussion
3322.

Which of the following halides is not oxidised by MnO_(2)?

Answer»

`F^(-)`<BR>`CL^(-)`
`Br^(-)`
`I^(-)`.

ANSWER :C
Discussion
3323.

Treatment of propionaldehyde with dil NaOH solution gives

Answer»

`CH_(3)CH_(2)COOCH_(2)C_(2)H_(5)`
`CH_(3)CH_(2)CHOHCH_(2)CH_(2)CHO`
`CH_(3)CH_(2)CH(OH)CH(CH_(3))CHO`
`CH_(3)CH_(2)COCH_(2)CH_(2)CHO`

Answer :C
Discussion
3324.

Which of the following isomerism is not exhibited by [Cr(NH_(3))_(2)(H_(2)O)_(2)Cl_(2)]Cl

Answer»

Ionisation
Geometrical
Hydrate
Optical

SOLUTION :`[Cr(NH_(3))_(2)(H_(2)O)_(2)Cl_(2)]Cl` will not exhibitionization ISOMERISM SINCE all `Cl^(-)` ions present.
Discussion
3325.

Which of the following combinations in an aqueous medium will give a blue colour or precipitate

Answer»

`Fe^(2+)+[Fe(CN)_(6)]^(3-)`
`Fe^(3+)+[Fe(CN)_(6)]^(4-)`
`Co^(2+)+SCN^(-)`
`Fe^(3+)+SCN^(-)`

SOLUTION :Due to formation CORRESPONDING COMPLEX
Discussion
3326.

Which of the statements about electrolytic conductance is not true?

Answer»

CONDUCTIVITY increases with DECREASE in viscosity.
Higher DIELECTRIC constant shows lower CONDUCTANCE in solution.
Temperature increases, conductance ALSO increases.
Molar conductance increases with increase in dilution.

Answer :B
Discussion
3327.

The reduction of benzenediazonium chloride to phenyl hydrazine can be accomplished by

Answer»

`SnCl_(2), HCl`
`Na_(2)SO_(3)`
`CH_(3)CH_(2)OH`
`H_(3)PO_(2)`

Solution :
Benzenediazonium chloride FORMS phenylhydrazine with `Na_(2)SO_(3)` and mild REDUCING agents such as `SnCl_(2)//HCl` while benzenediazonium chloride upon reduction with hypophosphorous acid `(H_(3)PO_(2))` or ETHANOL at room temperature gives benzene.
Discussion
3328.

What is the O.N. of Mn in K_2MnO_4:

Answer»

`+4`
`+6`
`+2`
`+8`

ANSWER :B
Discussion
3329.

underset("having smell")underset("White fumes")(B)overset("Moist air")larrunderset("element colourless")underset("M=Transition")(MCI_(4))overset(Zn)rarrunderset("colour")underset("Purple")(A) Identifythe metal M and hence MCl_(4). Explainthedifference incolour of MCl_(4) and A.

Answer»

Solution :`underset("having SMELL")underset("White FUMES")(B)overset("Moist air")larr underset("element, colourless")underset(M=("Transition"))(MCI_(4))overset(Zn)RARR underset("COLOUR")underset("Purple")(A)`
`M = Ti, MCI_(4) + TiCI+_(4)`
`A = [Ti(H_(2)O)_(6)]^(3+) B = TiO_(2)`
`Ti(IV) ` ion constains no d-element , so it is colourless .
`Ti(III) ` ion constains one d-element , so it is coloured .
Discussion
3330.

Write the equations involved in the preparation of potassium dichromate from chromite ore.

Answer»

Solution :(i) Preparation of `K_2Cr_2O_7` from CHROMITE ore
(a) POTASSIUM dichromate is obtained by the fusion of chromite ore `(FeCr_2O_4)` with sodium ( or potassium) carbonate in the presence of excess of air.
`underset("Chromiteore")(4FeCr_2O_4+8Na_2CO_3+7O_2)tounderset("(Yellow solution)of Sodium chromite")(8Na_2CrO_4+2Fe_2O_3+8CO_2)`
The solution is filtered and TREATED with SULPHURIC acid
`Na_2CrO_4+H_2SO_4tounderset("Sodium dichromate")(Na_2Cr_2O_7+Na_2SO_4+H_2O)`
(C) Now sodium dichromate is treated with potassium chloride. As a result potassium dichromate is poduced
`Na_2Cr_2O_7+2KCltounderset(potassium dichromate crystal")(K_2Cr_2O_7+2NaCl)`
Discussion
3331.

Which of the following equations correctly represents the standard heat of formation (DeltaH_(f)^(@)) of methane

Answer»

C(diamond)`+2H_(2)(G)rarrCH_(4)(g)`
`C("graphite")+2H_(2)(g)rarrCH_(4)(l)`
`C("graphite")+2H_(2)(g)rarrCH_(4)(g)`
`C("graphite")+4HrarrCH_(4)(g)`

SOLUTION :`C_(("graphite"))+2H_(2(g))rarrCH_(4(g))`.
Discussion
3332.

Which of the following is most effective electrolyte in the coagulation of Fe_(2)O_(3).H_(2)O)//Fe^(3+) sol ? KCl, AlCl_(3),MgCl_(2),K_(4)[Fe(CN)_(6)]

Answer»

Solution :`K_(4)(CN)_(6)]` because oppositely CHARGED NEGATIVE ions, `[Fe(CN)_(6)]^(4-)` have maximum valency.
Discussion
3333.

Which of the following enhances lathering property of soap?Sodium carbonate,sodium rosinate,sodium stearate,Trisodium phosphate.

Answer»

SODIUM carbonate
sodium rosinate
sodium stearate
Trisodium phosphate.

Answer :B
Discussion
3334.

Write the equations for the preparation of 1- iodobutane from (i) 1- butanol(ii) 1-chlorobutane(iii) but -1-ene.

Answer»

Solution :(i) `underset("1-Butanol ") (CH_(3)CH_(2)CH_(2)CH_(2)OH) OVERSET(P + I_(2)) to underset("1-Iodobutane") (CH_(3)CH_(2)CH_(2)CH_(2)I)` <BR> (ii) `underset("1-Chlorobutane ")(CH_(3)CH_(2)CH_(2)CH_(2)Cl) underset("Finkelstein reaction ") overset("KI/acetone, " Delta) to underset("1-Iodobutane")(CH_(3)CH_(2)CH_(2)CH_(2)I)`
(iii) `underset("But 1-ene")(CH_(3)CH_(2)CH) = CH_(2) underset("Anti - Markovnikov ADDITION ") overset("HBR, peroxide") to underset("1-Bromobutane")(CH_(3)CH_(2)CH_(2)Br) underset ("Finkelslein reaction ") overset("KI/acetone,"Delta ) to underset("1-Iodobutane") (CH_(3)CH_(2)CH_(2)CH_(2)I)`
Discussion
3335.

When SO_(2) is passed intosuspention of CaSO_(3) in water (a) _____ is formed.

Answer»


Answer :a.`CA(HSO_(3))_(2)` SOLUBLE
Discussion
3336.

Which of the following statement is incorrect for physical adsorption ?

Answer»

Monomolecular LAYER forms on the adsorbent. 
It is instantaneous.
Less activation ENERGY is REQUIRED for it.
Generally it results at low temperature and adsorption decreases with increase in temperature. 

Solution :Monomolecular layer forms on the adsorbent.
Discussion
3337.

The school principla called a team of doctors to the schood for a medical check up of thestudents , as a student had fainted in the class a few days ago. On check up , it was found that some students were weak, some had lowheart palpitation whereas someothers had some loss of skin colour. On discussion with the doctors, theyreported that thest students had deficiency of iron. After reading the above paragraph, answer the following questions : (i) What values are expressed in the above paragraphs ? (ii) In what form,iron is presentedin our body ? (iii) Name three green leafy vegetables which we should eat so that deficiency of iron does not takes place.

Answer»

Solution :(i) We should eat greenvegetables, salad and meatdeficiencyofiron in our BODY.
(ii)Iron is a constituent ofour blood in the form of haemoglobin.
(III) SPINACH(palak) mustard LEAVES ( sarson) and FENCE greek ( methi).
Discussion
3338.

Which of the following compound has plane of symmetry ? R=-underset(CH_(3))underset(|)CH-Cl"",S=-underset(Br)underset(|)CH-Cl

Answer»




None of these

Solution :Consider
no PLANE can PASS in such a WAY that MOLECULE has symmetry.
Discussion
3339.

Which element among inert gases form, maximum number of compounds? Write the formula of one of the compounds formed by the element.

Answer»

SOLUTION :XENON, `XeF_2`
Discussion
3340.

When 1mole of carbon is converted into 1mole of CO_2 the heat liberated is same:

Answer»

Irrespective of whether the volume is kept CONSTANT or PRESSURE is kept constant
Irrespective of the temperature at which the reaction is carried out
Whether the carbon is in the FORM of diamond or garphite
None

Answer :A
Discussion
3341.

Which of the following alkane cannot be prepared by Clemmenson's reduction of ketones ?

Answer»




ANSWER :A
Discussion
3342.

Which of the following is more paramagnetic

Answer»

`FE^(+2)`
`Fe^(+3)`
`CR^(+3)`
`Mn^(+3)`

Solution :`Fe^(3+)` have highest no. of unpaired ELECTRON so it will be more paramagnetic.
Discussion
3343.

Why are halogen gases or volatile liquid or solid at room temp. ?

Answer»

Solution :MAINLY intermolecular FORCES of ATTRACTION between the molecules of halogen are weak van der WAALS. forces.
Discussion
3344.

Which of the followingis not correct?

Answer»

The METALLIC conduction is due to the movement of ELECTRONS in the metal
The electrolytic conduction is due to the movement of ions in the solution
The current carrying ions are not NECESSARILY DISCHARGED at the electrodes
The metallic conduction increases with the increase in temperature, whereas that of electrolytic conduction decreases with temperature.

Answer :D
Discussion
3345.

Which of the following does not give a halide with PCl_5?

Answer»

`HCHO`
`HCOOH`
`C_2H_5OH`
`C_6H_5OH`

ANSWER :A
Discussion
3346.

The selection of reducing agent depends on the termodynamic factor : Explain with an example.

Answer»

Solution :(i) A suitable agent is selected based on the thermodynamics considerations.
(ii) For a spontaneous reaction, the cgane in free energy `(Delta G)` should be negative.
(iii) Therefore, thermodynamically, the reduction of metal oxide with a given REDUCING agent can occur if the free energy change for the coupled reaction is negative.
(IV) Hence, the reducing agent is selected in such a WAY that it provides a large negative `Delta G` value for the coupled reaction.
Discussion
3347.

When solid particles of the size less than 1.0 pm are suspended in air, it is called

Answer»

Dust
Smoke
Fume
Fly ash

Answer :C
Discussion
3348.

Which of the following is a germicide also?

Answer»

CATIONIC DETERGENT
ANIONIC detergent
Non-ionic detergent
None of these

Solution :Cationic detergent has GERMICIDAL PROPERTY
Discussion
3349.

Vitamin B_(1) deficiency causes

Answer»

BERIBERI 
Night BLINDNESS 
RICKETS 
Sterility 

ANSWER :A
Discussion
3350.

Which of the following liberate hydrogen on reaction with dilute H_(2)SO_(4)

Answer»

Fe
Cu
Al
Hg

Solution :`2Al+dil.H_(2)SO_(4)toAl_(2)SO_(4)+H_(2)UARR`.
Discussion