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13801.

Whichofthefollowingreactionstakingplacein theblastfurnase duringextractionof iron isendothermic ?

Answer»

` CaCO_ 3toCa O + CO _ 2`
` 2 C +O_ 2to2CO`
` C +O_ 2toCO _ 2`
`Fe_ 2O_ 3+3 COto2 FE+3 CO _ 2`

Answer :A
Discussion
13802.

ZnAmalgan is prepated by electrolysis of aqueous ZnCl_(2) using Hg catode (9gm). Current is passed through ZnCl_(2) solution for 1000 seconds to prepare a Zn Amalam with 25%Zn by wt. (Zn=65.4)

Answer»

Current off `8.85` amp is passed in the process.
Current of `5.65` amp is passed in the process
Mass of `Zn` in Amalgam is `3gm`
Mass of `Zn` in Amalgam is `6gm`.

Solution :Let `x` gm of `Zn` DEPOSIT of `9gm` of `Hg`
`%` of `Zn` in Amalgam`=(m_(Zn)XX100)/(m_(Zn)xxm_(Hg))=x/(9+x)xx100=25`
`:.x=3gm`
EQ. of `Zn=(3xx2)/(65.4)`
`(n_(Zn))/1=(n_(e^(-)))/2=Q/(2f)=("it")/(2f)`
Current `i=6/(65.4)xx96500/1000=8.85amp.`
Discussion
13803.

What is the cause of depression in human beings ? Name two medicines to reduce depression ?

Answer»

SOLUTION :NORADRENALINE is a neurotransmitter if the level of noradrenariline in the body is low, then the message transfer mechanism becomes SLOW and the person suffers from depression. The antidepressant drugs USED to reduce depression are iproniazid and phenelzine.
Discussion
13804.

The set of reaction in a cell which help in degradation of macromolecules is called :

Answer»

METABOLISM
Anabolism
Catabolism
All of the above

Answer :C
Discussion
13805.

When 45g of glucose was dissolved in 500g of water the solution has a freezing point of -0.93^(@)C. (a) What is the molecular weight of glucose ? (b) If the simplest formula is CH_(2)O what is its molecular formula ?

Answer»


ANSWER :`180`; `C_(6)H_(12)O_(6)`
Discussion
13806.

Which is an example of thermosetting plastic?

Answer»

POLYTHENE
PVC
Neophene
BAKELITE

ANSWER :D
Discussion
13807.

The vapour pressuress of pure solvent and solution are 120 mm and 108 mm respectively. The mole fraction of the solvent in the solution is

Answer»

0.1
0.9
120/108
1.08

Solution :According to RAOUT's
`(P_(1)^(0)-P)/p_(1)^(0)=X_(2)` (MOLE FRACTION of solute)
`(120-108)/120=X_(2)=0.1`
Mole fraction of SOLVENT `=1-X_(2)=1-0.1=0.9`
Discussion
13808.

What is the formula of brown ppt?

Answer»

`FE(OH)_(3)`
`Fe(OH)_(2)`
`FeCI_(3)`
NONE of these

Solution :N//A
Discussion
13809.

Which of the following pairs will show the same magnetic moment ('spin only')?

Answer»

`[Cr(H_(2)O)_(6)]^(3+)" and "[FE(H_(2)O)_(5)NO]^(2+)`
`[Mn(CN)_(6)]^(4-)" and "[Fe(CN)_(6)]^(3-)`
`[NI(CO)_(4)]" and "[Zn(NH_(3))_(4)]^(2+)`
All of these

Answer :D
Discussion
13810.

Which of the following are correct represents of L-amino acids

Answer»




ANSWER :A::C::D
Discussion
13811.

Which of the following statements is incorrect w.r.t. physisorption?

Answer»

The forces involved are van der Waals' forces.
More EASILY liquifiable GASES are adsorbed easily .
Under high pressure it results into multi - molecular LAYER on adsorbent
`DeltaH_("adsorption")` is low and +ve

Solution : : `DeltaH_("adsorption")` is always negative.
Discussion
13812.

Which is not a natural semi permeable membrane ?

Answer»

PLANT celwall
Urinary BLADDER
CELLOPHANE paper
NONE of these

Answer :C
Discussion
13813.

General electronic configuration of transition metals is

Answer»

SOLUTION :`(n-1)d^(1-10) NS^(0-2)`
Discussion
13814.

Which statement is incorrect .

Answer»

Glucose and Fructose give the same OSAZONE on reactionwith excess of phenyl hydrazine
Hydrolysis of sucrose BRINGS a change in SIGN of rotation towards plane polarised light.
Pentacetate of glucose fromm oxime on treatment with `H_(2)N-OH`
Glucose on reaction with acetic anhydride forms pentacetate under suitable condition.

Solution :Osazone formation involves `C_(1)` and `C_(2)` carbon but doesn't affect the other STEREOCENTER and glucose and fructose have same configuration at `C_(2),C_(4)` and `C_(5)` carbon atom.
Discussion
13815.

Which of the following statements is/are true :

Answer»

The ratio of the mean speed of the rms speed is independent of temperature of gas
The square of the mean speed of the MOLECULES is equal to the mean squared speed at a CERTAIN temperature
Mean translational kinetic energy of the gas molecules at any given temperature is independent of the molecular mass of gas
The difference between rms speed and mean speed at any temperature for DIFFERENT gases diminishes as larger and yet larger molar MASSES are considered.

Solution :NA
Discussion
13816.

Which statement is correct for X + 2Y to P?

Answer»

the rate of disappeance of X
= twice the rate of DISAPPEARANCE of Y
the rate of disappearance of X
`=1/2` rate of APPEARANCE of PRODUCTS
the rate of appearance of products
`=1/2` the rate of disappearance of Y
the rate of appearance of products
`=1/2` the rate of disappearance of X

Solution :`-(d[X])/(DT)=-1/2(d[Y])/(dt)=(d[P])/(dt)`
Discussion
13817.

Which reaction was used by Bartlett to prepare the first noble gas compound.

Answer»

Solution :The first NOBLE gas compound, xenon dioxygenylhexafluoroplatinate (V) was prepared by reacting XE with `PtF_(6)`.
`Xe + PtF_(6) overset(278 K) RARR Xe^(+) [PtF_(6)]^(-)`
Discussion
13818.

which one acts as a poison to finely divided Fe in Haber's process for the manufacture of NH_(3)?

Answer»

`CO_2`
NO
CO
`N_2`

ANSWER :C
Discussion
13819.

Which of the following will occur if a 0.1 M solution of a weak acid is diluted to 0.01 M at constant temperature

Answer»

`[H^(+)]` will DECREASE to 0.01 M
pH will decrease
Percentage ionization will INCREASE
`K_(a)` will increase

Answer :B::C
Discussion
13820.

underset("black")(X(s)) overset("dil. HCl ")to Y uarr underset(NaOH)Overset(Na_(2)[Fe(CN)_(5)(NO)])toPurple solution gas Y has been allowed to react with following species in neutral/acidic medium: (a) FeCl_(3) (b) CuSO_(4) (c) BaCl_(2) (d) SO_(2) (e) Cr_(2)O_(7)^(2-) (f) CH_(3)COONa (g) Hg^(2+) Then calculate value of (P+Q-R) P: Number of specis which undregoes redox reaction with gas Y. Q: Numbe of species with which gas Y undergoes precipitation. R: Number of spceis with which gas Y produce no observable change.

Answer»


ANSWER :3
Discussion
13821.

Which one of the following is employed as a tranquilizerdrug ?

Answer»

Equanil
Valium
Naproxen
Chloropheninamine

Answer :A::B
Discussion
13822.

Which of the following is low spin to strong field ligands?

Answer»

`d_(XY)^(2) d_(xz)^(2) d_(yz)^(1)`
`d_(xy)^(2) d_(yz)^(1) d_(X^(3)-y)^(1) d_(Z^(2))^(1)`
`d_(xy)^(2) d_(xz)^(1) d_(yz)^(1) d_(x^(2)-y^(2))^(1)`
`d_(xy)^(1) d_(xz)^(1) d_(yz)^(1) d_(x^(2)-y^(2))^(2)`

Solution :Low spin (STRONG field) `(t_(2g)^(1)e_(g)^(4)" spin is " (1)/(2))`
Discussion
13823.

What type of isomerism is exhibited by pentanol?

Answer»

Position
Chain
OPTICAL
All of these

ANSWER :D
Discussion
13824.

The typical reaction of alkyl halide is :

Answer»

Electrophilic SUBSTITUTION
NUCLEOPHILIC substitution
Electrophilic ADDITION
Nucleophilic addition

ANSWER :B
Discussion
13825.

Which of the following halide can be converted into anhydrous form on heating :-

Answer»

`BeCl_(2)*H_(2)O`
`KCL *6H_(2)O`
`AlCl_(3)*6H_(2)O`
`FeCl_(2) *6H_(2)O`

Solution :Hydrated ionic chloride converted into anhydrous on HEATING
Discussion
13826.

Which of the following base is found only in RNA and not in DNA :

Answer»

THYMINE
Uracil
Adenine
Guanine

ANSWER :B
Discussion
13827.

The statement that is NOT correct is that

Answer»

a FURNACE lined with Haematite is USED to convert cast iron to wrought iron.
collectors enhance the wettability of MINERAL particles during froth floatation.
in VAPOUR phase refining, metal should form a VOLATILE compound.
copper from its low grade ores is extracted by hydrometallurgy.

Solution :Collectors enhance the non-wettability of mineral particles during froth floatation.
Discussion
13828.

When a fat is heated with NaOH, the substances formed are:

Answer»

oil and `Na_(2)CO_(3)`
soap and glycerol
soap and oil
soapless DETERGENT and WATER

ANSWER :B
Discussion
13829.

What is the main cause of charge on a colloidal solution ?

Answer»

Solution :The charge on the colloidal particles is DUE to ADSORPTION of common ions of the electrolyte on the surface of the colloidal particles, e.g., `Fe^(3+)` from `FeCl_(3)` on the surface of `Fe(OH)_(3)` particles.
Discussion
13830.

What mass in milligram of radiation?

Answer»


ANSWER :1
Discussion
13831.

Which of the following are formed on addition reaction of DCl with 3-methyl-1-butene

Answer»

`CH_2DCHClCH(CH_3)_2`
`CH_2DCH_2C CL(CH_3)_2`
`CH_3CDClCH(CH_3)_2`
`ClCH_2CHDCH(CH_3)_2`

SOLUTION :
Discussion
13832.

Two nucleotides combine with each other by to which chain ?

Answer»

PHOSPHODIESTER
Peptide
Glycoside
Disulphide

Solution :Phosphodiester
Discussion
13833.

Which of the following metals is extracted using silica lined convertor ?

Answer»

MG
AL
CU
Zn

Answer :C
Discussion
13834.

When 1.0 gm of KCl is dissolved in 200 gm water, the decrease in freezing point of such solution is 0.24 K, calculate Van't Hoff factor (i) for such solution. K_(f) of water = 1.86 K kg / mol.

Answer»


ANSWER :`1.92`
Discussion
13835.

Which carbohydrate cannot be metabolised by human being:

Answer»

Maltose
Cellulose
Amylose
Amylopectin

Answer :B
Discussion
13836.

Which of the following reaction(s) can be used for the preparation of alkyl halides ? (I) CH_(3)CH_(2)OH +HCl overset("anh." ZnCl_(2))to (II)CH_(3)CH_(2)OH +HCl to (III) (CH_(3))_(3)COH+ HCl to (IV) (CH_(3))_(2)CHOH+ HCl overset("anh." ZnCl_(2))to

Answer»

(IV) only
(III) and (IV) only
(I), (II) and (IV)only
(I) and (II) only

Solution :(I) and (IV) can be used due to presence of ANHYDROUS `ZnCl_(2)` (III) gives alkyl HALIDE due to formation of more stable carbocation.
Discussion
13837.

The relative rates of diffusion of sulphur dioxide ( molar mass = 64) and helium ( at. Mass = 4) at the same temperature and pressure are :

Answer»

`16:1`
`1:4`
`8 :1`
`1: 8`

Solution :`( r ( SO_(2)))/( r ( He))= SQRT(( 4 )/( 64)) = ( 1)/( 4)`
Discussion
13838.

Whichof thefolloweingreactionsisexpectedtoreadily givea hyrocarbonproductin good yield?

Answer»

`(CH_(3))_(3) C-Cloverset(C_(2)H_(5)OH)to`
`ROOCK overset("ELECTROLYSIS")to`
`CH_(3)-CH_(3) underset(hv)overset(Cl_(2))to `
`RCOOAG overset(Br_(2))to`

ANSWER :B
Discussion
13839.

What is the molar volume of 2 grams of hydrogen gas at STP taking the atomic mass of hydrogen as 1?

Answer»


ANSWER :22.4 LITRE
Discussion
13840.

The role of a catalyst in a chemical reaction is to change:

Answer»

ENTHALPY of a reaction
Nature of products
Activation energy
Equilibrium constant.

Answer :C
Discussion
13841.

Which test used to detect the types of Alcohol ?

Answer»

TOLLEN's TEST
Dow process
LUCAS test
Cumene process

Solution :Lucas test
Discussion
13842.

Which one of the following is a conjugated protein?

Answer»

PHOSPHOPROTEIN
Glycoprotein
Chromoprotein
All of these

Solution : Conjugated proteins on HYDROLYSIS gives a non-protein PORTION along with `alpha`-amino ACID. The non-protein portion is called prosthetic group.

Since, all of them have non-protein part hence, all of them are conjugated protein.
Discussion
13843.

The sesquioxide of nitrogen is

Answer»

`N_2O`
NO
`N_2O_3`
`N_2O_5`

ANSWER :C
Discussion
13844.

Which of the following processes causes the emission of X-ray?

Answer»

`ALPHA`-EMISSION
`BETA`-emission
`beta^(+)` (POSITRON) emission
electron capture

Answer :D
Discussion
13845.

When the pressure is applied over system ice hArr wate what will happen

Answer»

More water will FORM
More ice will form
There will be no effect over EQULIBRIUM
Water will decompose in `H_(2)and O_(2)`

Solution :`UNDERSET("more volume")(Ice)hArrunderset("LESS volume")(Water)`
On increasing pressure, equlibrium shifts forward.
Discussion
13846.

Which one of the following can be oxidised to the corresponding carbonyl compound?

Answer»

2-Hydroxypropane
o-Nitrophenol
Phenol
2-Methyl-2-hydroxypropane

Solution :2-Hydroxypropane
Discussion
13847.

Write the IUPAC names for the following complexs. (i) .Na_2 [Ni("EDTA")] (ii) .[Ag(CN)_2]^(-) (iii) . [Co(en )_3 ]_2 )(SO_4) _3 (iv) .[Co("ONO") (NH_3) _5 ]^(2+) (v). [Pt(NH_3) _2 Cl(NO)_2]

Answer»

Solution :(i) . Sodium 2,2',2",2'"-(ethane -1,2 diyldinitroilo tetraacetaonickelate (II)
(ii). Dicyanidoargentate (I) ION
(iii) . Tris (ethane 1,2 diamine ) COBAT (III) SULPHATE
(iv) . Pentaamminenitrito -KO cobalt (III) ion
(v). Diammaine chloridonitro KN platinum (II)
Discussion
13848.

Which carbon have different arrangement of alpha and beta glucose ?

Answer»

`C_(1)`
`C_(2)`
`C_(3)`
`C_(5)`

SOLUTION :`C_(1)`
Discussion
13849.

Which one of the following statements about amino acids is false?

Answer»

They are constituents of all PROTEINS.
They are all high melting solids.
Most naturally OCCURRING AMINO acids have D-configuration.
They are characterised by isoelectric POINT.

SOLUTION :Most naturally occurring amino acids have L-configuration.
Discussion
13850.

The substance with nauseating smell is

Answer»

`C_(6)H_(5)CN`
`C_(6)H_(5)NO_(2)`
`C_(6)H_(5)NH_(2)`
`C_(6)H_(5)NC`

Answer :D
Discussion