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17351.

What is gutta-percha?

Answer»

SOLUTION :It is HORNY and TOUGH POLYMER of trans-isomer of ISOPRENE.
Discussion
17352.

What type of a battery is lead storage cell ? Write the anode and cathode reaction and overall reaction occurring in a lead storage battery during discharging and recharging of cell.

Answer»

Solution :It is a secondary CELL.
`{:("Anode reaction :",P+SO_(4)^(2-)rarrPbSO_(4)+2e^(-)),("Cathode reaction :",PbO_(2)+4H^(+)+SO_(4)^(2-)+2e^(-)rarr PbSO_(4)+2H_(2)O):}`
`PB(s)+PbO_(2)+2H_(2)SO_(4)overset("Discharging")underset("Recharging")hArr 2PbSO_(4(s))+2H_(2)O(l)`
Discussion
17353.

Which of the following metal pairs on burning is moist air do not give smell of ammonia ? Mg, Ca, K, Li, Na, Al

Answer»

`MG, K`
`Ca, NA`
`K, Na`
`LI, Al`

ANSWER :C
Discussion
17354.

Which of the following statements is correct about heat of combustion?

Answer»

It may be EXOTHERMIC in some cases and endothermic in other cases
It is applicable to gaseous substances only
It is always an exothermic reaction
Its VALUE does not change with TEMPERATURE

Answer :C
Discussion
17355.

What are tranquilizers ? Give two examples.

Answer»

SOLUTION :The CHEMICAL substances which reduces ANXIETY are CALLED tranquilizers. They act on the central nervous system. For example, Seconal and Luminal.
Discussion
17356.

Write IUPAC name of the coordination isomer of the complex [Co(en)_(3)] [Cr(CN)_(6)].

Answer»

Solution :Coordination isomer of the given compound is `[CR(en)_(3)] [Co(CN)6]`. Its name is tris (ETHANE- 1,2-diamine)chromium(lll) hexacyanocobaltate(III).
Discussion
17357.

Which isomer of C_(4)H_(9)Cl will have the lowest boiling point?

Answer»

SOLUTION :FRANCIUM and RADIUM
Discussion
17358.

Which of the following biomolecules are called target molecules or drugs target?

Answer»

Carbohydrates
Proteins
NUCLEIC Acids
All of these

Answer :D
Discussion
17359.

Transition elements form complexes because of:

Answer»

SMALL size of cation
Vacant d-orbitals
Large IONIC charge
All

Answer :D
Discussion
17360.

Which of the following compounds undergo chlorination to produce atype of monochloroalkane -

Answer»

`(CH_3)_4C`


ANSWER :A::B::D
Discussion
17361.

Which of the following polymer does not contain hydrogen bonding?

Answer»

Nylon-6,6
Polyurethanes
Kevlar
Dacron

Answer :D
Discussion
17362.

What is the effect of denaturation of proteins ?

Answer»

SOLUTION :On heating or on TREATMENT with MINERAL acids, electrolytes etc. the water soluble globular proteins undergo coagulation resulting in the loss of BIOLOGICAL activity to give water fibrous proteins. This process is CALLED denaturation of proteins.
Discussion
17363.

Which of the following has glycosidic linkage ?

Answer»

MALTOSE
Anylose
GALACTOSE
SUCROSE

ANSWER :A::B::D
Discussion
17364.

The total number of structural isomers for the compound having molecular formula C_(3)H_(5)Cl is :

Answer»

FOUR
Five
Six
One only

Answer :B
Discussion
17365.

The recently discovered element Db (Z=105) belongs to

Answer»

s
p
d
f-block of elements.

Answer :C
Discussion
17366.

Which of the following compounds is an amino acid

Answer»

`CH_(3)-CH_(2)-overset(O)overset(|)(C)-O-NH_(4)`
`CH_(3)-underset(NH_(2))underset(|)(CH)-overset(O)overset(||)(C)-OH`
`CH_(3)-CH_(2)-overset(O)overset(||)(C)-NH_(2)`
`CH_(3)-underset(NH_(2))underset(|)(CH)-overset(O)overset(||)(C)-Cl`

Solution :`CH_(3)-underset(NH_(2))underset(|)(C)H-COOH`
The COMPOUNDS in which both amino `(-NH_(2))` as well as ACIDIC `(-COOH)` group is present is CALLED amino acid.
Discussion
17367.

The solubility of AgCI(s) with solubility product 1.6xx10^(-10) in 0.1M NaCI solution would be

Answer»

`1.26xx10^-5 M`
`1.6xx10^-9 M`
`1.6xx10^(-11) M`
Zero

Answer :B
Discussion
17368.

Which of the following descriptions about [FeCl_(6)]^(4-) is correct?

Answer»

`dsp^(3)` inner obrital COMPLEX, diamagnetic
`SP^(3)d^(2)`, outer orbital complex, paramagnetic
`d^(2)sp^(3)` inner orbital complex, paramagnetic
`sp^(3) d^(2)`, outer orbital complex , diamegnetic

Solution :In `[FeCl_(6)]^(4-)`
`Fe^(2+)(3D^(6))`

Paramagnetic due to PRESENCE of FOUR unpaired electrons.
Discussion
17369.

Which one of the following alcohol reacts immediately with Lucas reagent?

Answer»

PRIMARY ALCOHOL
TERTIARY alcohol
Phenol
SECONDARY alcohol

SOLUTION :Tertiary alcohol
Discussion
17370.

The value of 3.00 km in yards upto correct significant figures and the scientific notation is, (1m = 1.094 yards)

Answer»

`3282`
`32.8 X 10^2`
`3.28X10^3`
`328.2X10^1`

ANSWER :C
Discussion
17371.

Two separate bulbs contain ideal gases A and B respectively. The density of gas A is twice that of gas B and the molar of gas A is half that of gas B. If two gases are at the same temperature, the ratio of pressure of A to that of B is:

Answer»

Solution :4 <B> `P=(dRT)/(M)` (At the same TEMPERATUE)
`(P_(A))/(P_(B))=(d_(A))/(M_(B))XX(M_(B))/(d_(B))=(d_(A))/(d_(B))xx(M_(B))/(M_(A))=2xx2=4`
Discussion
17372.

Which of the following oxide is least acidic

Answer»

<P>`P_(4)O_(6)`
`P_(4)O_(10)`
`As_(4)O_(6)`
`As_(4)O_(19)`

ANSWER :C
Discussion
17373.

Two enantiomers differ with respect to

Answer»

MELTING point
Refractive index
Direction of rotation of PLANE polarised light
Solubility in ACHIRAL solvents

Answer :C
Discussion
17374.

The wavelength of photoelectric threshold energy of a metal is 230 nm. Determine the K.E. of the photoelectron ejected from the surface by U.V. radiation emitted from the 2nd longest wavelength transition (downward) of electron in Lymann series of atomic spectrum of hydrogen (R=1.09677xx10^(7)m^(-1))

Answer»


ANSWER :`1.074xx10^(-18)J`
Discussion
17375.

Which of the following respong to Butter of tin( or ) Oxymuriate of tin

Answer»

`SnCl_(2).2H_(2)O`
`SnCL_(2).5H_(2)O`
`SnCl_(4).3H_(2)O`
`SnCl_(4).8H_(2)O`

Solution :Tin , lead and silver CHLORIDE doesn't respond to chromyl chloride TEST.
Discussion
17376.

Which of the following compound is planar and non-polar ?

Answer»

`XeO_(4)`
`SF_(4)`
`XeF_(4)`
`CF_(4)`

Solution :
Discussion
17377.

Which of the following crystallizes in fcc structrue?

Answer»

AL
Be
Mg
Mo

Solution :Alcrystallises in FCC STRUCTURE.
Discussion
17378.

The reduction of ethyl acetate with LiAlH_(4) gives :

Answer»

Ethyl alcohol
Ethyl alcohol and acetic acid
Ethane and ethyl alcohol
Butane only.

Solution :`CH_(3)COOC_(2)H_(5)overset(LiAIH_(4))toCH_(3)2CH_(3)CONH_(2)+NH_(4)CL`
Discussion
17379.

Which of the following hybrides of group 15 has the lowest boiling point?

Answer»

`NH_(3)`
`SbH_(3)`
`PH_(3)`
`AsH_(3)`.

ANSWER :C
Discussion
17380.

Which of the following polymer form net like structure ?

Answer»

Polythene
Butyl rubber
Polystyrene
MELAMINE POLYMER

SOLUTION :Melamine polymer
Discussion
17381.

Write the formula of the following coordination compounds: (a) Amminebromidochloridonitrito-O-platinum(II) ion (b)Dichloridobis(ethane-1,2-diammine)platinum(IV) nitrate (c) Diaquatetrahydroxoaluminate(III) ion ( d) Mercury(I) tetrathiocyanatocobaltate(III).

Answer»

Solution :a) `[Pt(NH_(3))BrCl(ONO)]^(-)`, b) `[PtCl_(2)(EN)_(2)](NO_(3))_(2)`, c) `[Al(H_(2)O)_(2)(OH)_(4)]^(-)` and d) `Hg[Co(SCN)_(4)]`.
Discussion
17382.

Which is/are correct statement(s) ?

Answer»

When MIXTURE is more voilatile, there is positive DEVIATION from Raoult's law
When mixture is less volatile, there is negative deviation from Raoult's law
Ethanol and water FORM ideal solution.
`CHCl_(3)` and water form ideal solution.

Answer :A::B
Discussion
17383.

What are electro chemical cells? Mention its types.

Answer»

Solution :ELECTRO chemical cell is a device which inter converts chemical energy into electrical energy and VICE vers. It CONSISTS of two separate ELECTRODES which are in contact with an electrolyte solution.
Electro chemical cells are calssified into two TYPES : (i) Galvanic cell and (ii) Electrolytic cell.
Discussion
17384.

Which of the following will give SN^(2) mechanism?

Answer»




Solution :`EWG` in benzyl halides favoours `SN^(2)`, but `EDG` favours `SN^(1)`.
Discussion
17385.

Which of the following factor (s) affect the solubility of a gaseous solute in the fixed volume of liquid solvent? (i) nature of solute (ii) temperature (iii) pressure

Answer»

All of these
(i) only
(II) and (III) only
(iii) only

Answer :A
Discussion
17386.

When equimolar quantities of acetic acid and ethanol are at 25^@C, 1/3 of aceticacid remains unreacted as shown by titration with standard alkali. Calculate the concentration equilibrium constant.

Answer»


ANSWER :4
Discussion
17387.

Which of the following element is a metalloid

Answer»

BI
SN
Ge
C

Solution :Boron (B), Si, Ge, As, Sb, Te and At are the metalloid ELEMENT. Bismuth (Bi) and tin (Sn) are METALS while carbon (C ) is non-metal.
Discussion
17388.

Which of the following is most reactive towards SN^1reaction

Answer»

`C_6H_5 -undersetoverset(|)(CH_3)oversetunderset(|)(BR)(C ) - C_6H_5`
`C_6H_5 - undersetoverset(|)(H)oversetunderset(|)(Br)-C_6H_5`
`C_6H_5 - oversetunderset(|)(Br)( C)H - CH_3`
`C_6H_5CH_2Br`

ANSWER :A
Discussion
17389.

Which pair represents isostructural species?

Answer»

`CH_3^-and CH_3^+`
`NH_4^+ and NH_3`
`SO_4^(2-) and BF_4^-`
`NH_2^- and BeF_2`

ANSWER :C
Discussion
17390.

Whichone of thefollowingreagentis usedto convertfurctoseinto sorbitoland mannitol ?

Answer»

`LiAIH_(4)`
HI/Red P
Na/Hg
CONC. `HNO_(3)`

ANSWER :C
Discussion
17391.

The reducing agent in Wolff Kishner reaction is:

Answer»

`LiAlH_4`
`NaBH_4`
`NH_2NH_2` + BASE
`Zn-Hg/HCl`

ANSWER :C
Discussion
17392.

Which one of the following reactions is expected to readily give a hydrocarbon product in good yields ?

Answer»

RCOOK ` underset("oxidation ")overset("Elegtrolytic")to`
`RCO O^(-) Ag^(+) overset(Br_(2))to`
`CH_(3)CH_(3) underset(HV)overset(Cl_(2))to`
`(CH_(3))_(3)C Cl overset(C_(2)H_(5)OH)to`

Solution :Electrolysis of a concentrated aqueous solution of either sodium or potassium salts of saturated non-carboxylic acids yields HIGHER alkane at anode.
`2RCO OK underset("Oxidation")overset("Electrolytic")to underset("Anode")(2RCO O^(-))+underset("Cathode")(2K^(+))`
At anode `2RO O^(-) to 2RCO O+2E^(-) to R-R+2CO_(2)`
AtCathode `underset(2K+H_(2)O to 2KOH+H_(2)uarr)(2K^(+)+2e^(-)to 2K)`
Discussion
17393.

Which of the following statement is not correct about an inert electrode in a cell?

Answer»

it does not PARTICIPATE in the CELL REACTION.
it PROVIDES SURFACE either for oxidation or for reduction reaction.
It provides surface for conduction of electrons.
It provides surface for redox reaction.

Solution :Inert electrode provides surface for oxidation or reduction reaction but not for redox reaction. Hence, (d) is not correct
Discussion
17394.

Which among the following reducing agents is 'not' used to reduce acetaldehyde to ethyl alcohol

Answer»

Na-Hg and water
Zn-Hg and conc. HCL
`H_2` - RANEY Ni
Li-`AlH_4//H^+`

ANSWER :B
Discussion
17395.

Which pair of actinoids show +2 oxidation state?

Answer»

Am and TH
Pa and U
PU and Cm
No and Lr

Solution :Am and Th
Discussion
17396.

Which one of the following orders is correct for the bond dissociationenthalpy of halogen molecules ?

Answer»

`Br_(2) GT I_(2) gt F_(2) gt Cl_(2)`
`F_(2) gt Cl_(2) gt Br_(2) gtI_(2)`
`I_(2) gt Br_(2) gt Cl_(2) gt F_(2)`
`Cl_(2) gt Br_(2) gt F_(2) gt I_(2)`

Answer :B::C::D
Discussion
17397.

What are the order of rates of oxidation with HIO_(4) of the following diols. Explain with reactions.

Answer»

`Me_(2)C(OH)C(OH)Me_(2)`
`Me_(2)C(OH)CH(OH)Me`
`CH_(2)(OH)CH_(2)(OH)`
`MeCH(OH)CH(OH)Me`

Solution :altbltdltc (STERIC FACTOR)
Discussion
17398.

What happens when lead storage battery is subjected to charging?

Answer»

Solution :Charging of storage battery is the reverse of its discharge. The LEAD sulphate deposited on electrodes is REDUCED to lead and oxidised to PLUMBIC oxide, with a net reaction for two faradays.
`PbSO_(4)(s) + 2H_(2)O The cell potential INCREASES during charging. Hence, lead storage battery can be reused.
Discussion
17399.

When a strong beam of light is passed through a colloidal solution, the light will:

Answer»

GIVE a rainbow
Be reflected
Be scattered
Pass unchanged

Answer :C
Discussion
17400.

Which one of the following is used as an industrial solvent?

Answer»

METHANOL
BENZYL ALCOHOL
PHENOL
Cholesterol

Solution :Methanol
Discussion