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20651.

Write the IUPAC name of the complex K_3(Cr(C_2O_4)_3] .Draw the figure to show the splitting of 'd' orbitals in octahedral crystal field.

Answer»

SOLUTION :POTASSIUM trioxalatochromate(III)
Discussion
20652.

Write the equation involved in the reaction Williamson's ether synthesis.

Answer»

SOLUTION :`UNDERSET("ALKYL")(R-X)+underset("Sodium")(R^(1))-ONato underset("Ether.)(R-O-R^(1))+NaX`
Discussion
20653.

To carry out metabolim oxygen is taken up by haemoglobin (Hb) to from oxyhaemoglobin (HbO_(2)) according to the elementary reaction: Hb(aq) + O_(2)(aq) overset(K)(to)HbO_(2) (aq) the value of K is 2.0 xx10^(6) M^(-1) s^(-1) "at" 37^(@) C(body temperature). For an average adult the concentrations of Hb and O_(2) in the blood in the lungs are 8.0 xx10^(-6) M "and" 1.5 xx 10^(-6) M. respectively. The rate of formation of HbO_(2)increases ot 1.6xx10^(-4) Ms^(-1) during an exercise to meet the demand of increased metabolism rate. Assuming the Hb concentration to ramain same, what must the oxygen concentration be to sustain this rate of HbO_(2)formation? [If the answer is X then fill OMR by multiplying X with 10^(6).]

Answer»


ANSWER :10
Discussion
20654.

Which of the following ores is/are oxide ones)?

Answer»

TINSTONE
Bauxite
both
Carnallite

Solution :Tinstone `-SnO_(2)` Bauxite `-Al_(2)O_(3).2H_(2)O` both are oxide ores.
Carnllite `KC.MgCl_(2).6H_(2)O` CHLORIDE ORE.
Discussion
20655.

Which one is the strongest acid:

Answer»

`ClO_3(OH)`
`ClO_2(OH)`
`SO(OH)_2`
`SO_2(OH)_2`

ANSWER :A
Discussion
20656.

Westrosol is a commerical solvent used for oils, paints, varnishes etc. It is obtained from :

Answer»

`CHCl_(2)-CHCl_(2)`
`CHCl_(3)`
`C Cl_(2)F_(2)`
`CHCL=C Cl_(2)`

ANSWER :A
Discussion
20657.

The solubility product for SrF_(2) is 7.9xx10^(-11). A solution is 0.01 M in NaF. The minimum concentration of SrCl_(2) in the solution required to start the precipitation of SrF_(2) is equal to :

Answer»

`0.89xx10^(-5)`M
`0.79xx10^(-6)` M
`0.79xx10^(-8)` M
`0.89xx10^(-7)` M

Answer :B
Discussion
20658.

Which acts as a powerful oxidising agent ?

Answer»

`H_2S`
COOH-COOH
`FeSO_4`
`Cl_2`

ANSWER :D
Discussion
20659.

Which of the following statements are correct for SO_(4)^(2-) ion.

Answer»

It is tetrahedral
All the S - O bond lengths are equal and shorter than expected
It contains four SIGMA bonds between S and O atoms, TWO PI bonds delocalised over the S and four O atoms and the all the `"S - O"` bonds have the bond order `1.5`
It is SQUARE planar

Answer :A::B::C
Discussion
20660.

What is diazotization ?

Answer»

SOLUTION :The process of conversion of AROMATIC primary amines by treatment with `NaNO_2 //HCl` at 273-278 K to arenediazonium salts is CALLED diazolization. WRITE EQUATION yourself.
Discussion
20661.

Which forces are involved in holding the drugs to active sides of drugs?

Answer»

SOLUTION :H-bonding, van DER Waals INTERACTIONS, IONIC bonding and dipole-dipole interactions
Discussion
20662.

What happens when one drinks ethanol mixed with methanol? Why?

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SOLUTION :If ONE drinks ETHANOL mixed with methanol, he may become blind or even sometimes it leads to death. In the body, methanol is oxidised to methanal first and then to methanoic acid which is a POISON.
Discussion
20663.

Triglycerides which make up natural oils and facts can be .broken down to glycerol and fatty acid using:

Answer»

Diastage
LIPASE
TRYPSIN
PEPSIN

ANSWER :B
Discussion
20664.

The unbalanced chemical reactions given in List I show missing reagent or condition (?) which are provided in List II. Match List I with List II and select the correct answer using the code given below the lists {:(,"List I",,"List II"),(P.,PbO_(2)+H_(2)SO_(4)overset(?)rarr PbSO_(4)+O_(2),1.,NO),(Q.,Na_(2)S_(2)O_(3) + H_(2)O overset(?)rarr NaHSO_(4),2.,I_(2)),(R.,N_(2)H_(4) overset(?)rarr N_(2) + "other product",3.,"Warm"),(S.,XeF_(2)overset(?)rarr Xe + "other product",4.,Cl_(2)):}

Answer»

<P>`{:(,P,Q,R,S),((a),4,2,3,1):}`
`{:(,P,Q,R,S),((a),3,2,1,4):}`
`{:(,P,Q,R,S),((a),1,4,2,3):}`
`{:(,P,Q,R,S),((a),3,4,2,1):}`

Solution :`{:(P : PbO_(2)+2H_(2)SO_(4) overset("warm (3)")RARR 2 PbSO_(4)+O_(2)+2H_(2)O,,R: N_(2)H_(4)overset(+2I_(2)(2))rarr N_(2) + 4HI),(Q : Na_(2)S_(2)O_(3)+5H_(2)O overset(+4 Cl_(2)(4))rarr 2 NaHSO_(4)+ 8HCl,,S : XeF_(4) overset(+2 NO(1))rarr Xe + 2NOF):}`
Discussion
20665.

Whichof the followionghas least permissible limit in drinking water

Answer»

Chlorides
Dissolved OXYGEN
ZINC
LEAD.

ANSWER :D
Discussion
20666.

Whcihg of the following hydrogen halides react (s) with AgNO_(3) (aq) to give a precipitate that dissolves in Na_(2)S_(2)O_(3) (aq)

Answer»

HCl
HF
HBr
HI

Solution :HF does not gives any ppt. with `AgNO_(3)` since AgF is soluble in water. However, HCl, HBr and HI all react with `AgNO_(3)` to give first ppt. of the CORRESPONDING silver halide which DISSOLVES in aqueous `Na_(2)S_(2)O_(3)` solution.
`{:(HCl + AgNO_(3) rarr underset("White ppt.")(AgCl) + HNO_(3)),(HBr + AgNO_(3) rarr underset("Pale YELLOW ppt.")(AGBR) + HNO_(3)),(HI + AgNO_(3) rarr underset("Yellow ppt.")(AgI) + HNO_(3)),(AgCl (or AgBr or AgI) + 2 Na_(2)S_(2) O_(3) rarr underset(("dissolves to gives colourless solution"))underset("Sod. argentothiosulphat")(Na_(3)[Ag(S_(2)O_(3))_(2)])+ NaCl (or NaBr or Nal)):}`
Discussion
20667.

Which of the following state function is not zero at standard state -

Answer»

Enthalpy
Entropy
Free energy
Entropy and enthalpy

Answer :B
Discussion
20668.

Which of the following is a thermoplastic?

Answer»

bakelite
melamine
UREA FORMALDEHYDE
POLYSTRENE

SOLUTION : polystrene
Discussion
20669.

To which class of dyes does phenolphthalein belong

Answer»

NITRO DYES
Azo byes
Triphenyl METHANE dyes
PHTHALEIN dyes

Solution :It BELONG to phthalein dyes.
Discussion
20670.

Which one of the following is correct regarding physisorption?

Answer»

ITI nvolves chemical bonds between ADSORBENT and adsorbate
Enthaly of adsorption is about 80-240kJ `mol^(-1)`
It is reversible in nautre
It RESULTS in unimolecular LAYER only on adsorbent surface under high pressure

Answer :C
Discussion
20671.

Which of the following compounds is not coloured ?

Answer»

AgBr
AgI
`Cu_(2)O`
`ZnCl_(2)`

ANSWER :D
Discussion
20672.

Which of the following statement isnot ture -

Answer»

alkanes are non -polar compounds
alkanes are INSOLUBLE in polar solvent LIKE water
among ISOMERIC alkanes, n-alakane has the lowest boiling POINT
higher alkanes `(gt C_(17))` are hard like wax

ANSWER :C
Discussion
20673.

Which process is not used in purification of bauxite ?

Answer»

HALL's method
Baeyer's method
Serpek,s method
Frankland,s method

Answer :D
Discussion
20674.

Which one will give nylon fibres ?

Answer»

POLYAMIDE
POLYESTER
Polyvinyl
Polythene

Solution :Polyamide
Discussion
20675.

Which of the following name is impossible?

Answer»

POTASSIUM tetrafluoridooxidochromate (VI)
Barium tetrafluoridobromate (III)
Dichlorobis(UREA)copper (II)
All are impossible.

Solution :`overset(+X)Koverset(+6)(Cr)overset(-2)Ox+6gt+6("No"I^(+) "possible")`
Discussion
20676.

Trimethyl amine oxide and trimethyl phosphine oxide can be represented as (CH_3)_3N^(+)-O^(-) , (CH_3)_3P^(+)-O^(-) Answer the following questions based on theseSelect the correct structure

Answer»

`(CH_3)_(3)N=O`
`(CH_3)_(3)P=O`
Both a & B
NONE

SOLUTION :
Discussion
20677.

Which of the following factor may be regarded as the main cause of langthanide contraction ?

Answer»

POOR shielding of ONE of the 4f-ELECTRONS by another in the subshell
Effective shielding of one of the 4f-electrons by anotherin the subshell
Poorer shielding of 5d electrond by 4f electrons
Greater shielding of 5d electrons by 4f electrons.

ANSWER :a
Discussion
20678.

Which of the following releases 0.2 moles of hydrogen on hydrolysis-

Answer»

`0.1` MOLE of `LIH`
`0.2` mole of `LiH`
`0.3` mole of `LiH`
`0.4` mole of `LiH`

ANSWER :B
Discussion
20679.

Which of the following statement is true about the complex [CrCl_(3)(OH)_(2)(NH_(3))]^(2-) ion?

Answer»

It has three geometrical ISOMERS
Only one space isomers is optically ACTIVE and remaining are inactive
There are total four space isomers
The magnetic moment of complex ION is 3.89 BM

Solution :
Discussion
20680.

Which of the following is hyponitrous acid ?

Answer»

`N_2O_5`
`H_2N_2O_2`
`HNO_2`
`H_N_2O`

ANSWER :B
Discussion
20681.

Write the structure of the major organic product in each of the following reactions: (ii) (CH_3)_(3)CBr+KOH underset("heat")overset("ethanol")(rarr)

Answer»

Solution :`underset(2-"methylpropane")(CH_(3)-underset(CH_3)underset(|)(C)=CH_(2))`
Discussion
20682.

When a brown compound of Mn (A) is treated with HCI, it gives a gas (B). The gas (B) taken in excess reacts with NH_3 to give an explosive compound (C). The compounds A, B and C are

Answer»

`A= MnO_(2)`, `B= Cl_(2)`, `C=NCl_(3)`
A= MnO, `B=Cl_(2)`, `C=NH_(3)Cl`
`A= Mn_(3)O_(4)`, `B= Cl_(2)`, `C= NCl_(3)`
`A= MnO_(3)`, `B=Cl_(2)`= `C= NCl_(2)`

Solution : `MnO_(2)+4HClrightarrowCl_(2)+MnCl_(2)+2H_(2)O`
`3Cl_(2)NH_(3)rightarrow Ncl_(3)+3HCl`
Discussion
20683.

The zinc / siver oxide cell is used in electricwatches Zn rarr Zn^(2+) + 2e^(-), E^(@)=0.76 V Ag_(2)+H_(2)O+2e^(-)rarr2ag+2OH^(-),E^(@)=-0.344 V what is triangle G^(@)in joules for the reaction

Answer»

`2.13 xx10^(2)`
`-213072`
`+213072`
`213.072`

Solution :`Zn(s)+2Ag^(+) (Aq) rarr Zbn^(2+)(Aq)+2 Ag(s)`
`E_("CELL")^(@)=E_("cathode")^(@)-E_("ANODE")`
`=E_(Zn^(2+)//Zn)^(@)-E_(Ag^(+)//Ag)^(@)`
`=-213072 CV=- 213072 J`
Discussion
20684.

Which of the following is the least basic?

Answer»

`YB(OH)_(3)`
`Ce(OH)_(3)`
`ND(OH)_(3)`
`Gd(OH)_(3)`

Answer :A
Discussion
20685.

What are the following substances ? Give one example of each one of them. (i) Tranquilizers (ii) Food preservatives (iii) Synthetic detergents.

Answer»

Solution :(i) Tranquilizers : Tranquilizers are a class of chemical compounds USED for treatment of STRESS and mild or even severe mental diseases. They relieve anxiety, stress, irritability or excitement by inducing a sense of well being. They form an essential component of sleeping pills. Some examples of tranquilizers are meprobamate and equanil.
(ii) Food preservatives : Substances that prevent spoilage of food due to microbial GROWTH are called food preservatives. Commonly used preservatives include table salt, sugar and sodium benzoate.
(iii) Synthetic detergents : Synthetic detergents are cleansing agents which have all the properties of soaps but which actually do not contain any soap. These can be used both in soft and HARD water.
Cationic detergents such as catyltrimethyl ammonium bromide. Anionic detergents such as sodium laurylsulphate. Non-ionic detergents such as polyethylene glycol STEARATE.
Discussion
20686.

Write the formulate of the following coordination compounds : (i) sodium pentacyanonitrosylsulphidoferrate (III) (ii) potassium tetrahydroxozincate (II)

Answer»

Solution :(i) Cation (simple ion) = `Na^(+)`
For the COORDINATION entity, WRITING FIRST the symbol for metal atom and then the ligands in the alphabetical order, we have
Discussion
20687.

Which of the following is incorrect about Wilkinson's catalyst

Answer»

It is non-ionic COMPLEX
It is DIAMAGNETIC complex
It is TETRAHEDRAL complex
It is a high spin complex

Solution :WILKINSON's catalyst - `[RhCl(pph_3)_3]`
-square planar
-`dsp^2`hybridised
- diamagnetic
- HYDROGENATION cataltst
Discussion
20688.

Which of the following is correct about the adsorption of N_(2) over iron ?

Answer»

It is always PHYSICALLY adsorbed
Extent of adsorption over iron in increases with the increase in TEMPERTURE first and then DECREASES
It always chemically adsorbed
`N_(2)` is near absorbed over iron

SOLUTION :Adsorption of Nitrogen on iron is chemisorption
Discussion
20689.

Which of the following is an appropriate set of reactants for the preparation of 1-methoxy-4-nitrobenzene? Why?

Answer»

<P>

Solution :The SECOND SET is better. `CH_3Br` will undergo NUCLEOPHILIC substitution FASTER than p- nitro-bromobenzene.
Discussion
20690.

When crystal of the solute is introduced into a super saturated solution of the solute:

Answer»

The SOLUTE dissolves
The excess solute crystallises out
The solution becomes unsaturated
The solution REMAINS super saturated

Answer :B
Discussion
20691.

What are the product of following reaction ? C_2H_5OCH_3 overset"Cold HI"to

Answer»

`C_2H_5OH + CH_3I`
`C_2H_5I + CH_3OH`
`C_2H_5OH + CH_3OH`
`C_2H_5I + CH_3I`

ANSWER :A
Discussion
20692.

Which of the following shows wrong matching

Answer»

`H_(2)C_(2)O_(4) overset("conc." H_(2)SO_(4)) to CO+CO_(2)+H_(2)O-H_(2)SO_(4)` an DEHYDRATING agent
`Cu+2H_(2)SO_(4) to CuSO_(4)+2H_(2)O+SO_(2)+H_(2)SO_(4)` as oxidizingagent
`Na_(2)S+H_(2)SO_(4) to Na_(2)SO_(4)+H_(2)S-H_(2)SO_(4)` as an ACID
`2HBr+H_(2)SO_(4) to 2H_(2)O+SO_(2)+Br_(2)-H_(2)SO_(4)` as reducing agent

Solution :`SO_(2)+2H_(2)O to H_(2)SO_(4)+2H`. COLOURED matter is REDUCED.
Coloured compound `+H to ` colourless compound
The bleaching action of `SO_(2)` is TEMPORARY and reversible.
Discussion
20693.

Which of the following alcohol contain vinyl group

Answer»




ANSWER :C
Discussion
20694.

Which of the following is a hypnotic drug

Answer»

Luminal
Salol
Catechol
Chemisol

Solution :These drugs produce SLEEP and are habit FORMING common example of HYPNOTICS drugs are Luminal and Saconal.
Discussion
20695.

Which of the following is Buna -N

Answer»

`-[CH_2-CH=CH-CH_2-CH_2-OVERSET(C_6H_5)overset(|)CH]_n-`
`-[CH_2-CH=CH-CH_2-CH_2-overset(CN)overset(|)CH]_n-`
`-[CH_2-CH_2-CH_2-CH_2-CH_2-overset(CN)overset(|)CH]_n-`
`-[CH_2-CH_2-CH=CH-CH_2-overset(CN)overset(|)CH]_n-`

ANSWER :B
Discussion
20696.

The vapour pressure of water at 20^(@)C is 17.54 mm. When 20 g of a non-ionic substance is dissolved in 100g of water, the vapour pressure is lowered by 0.30 mm . What is the molecular weight of the substances

Answer»

`210.2`
`206.88`
`215.2`
`200.8`

SOLUTION :`(P_(o)-P_(s))/(P_(s))=(w)/(m)xx(M)/(W)`
`P_(o)=17.54 MM`
`P_(s)=17.24 mm`
M = 18
W = 100
w = 20
m = ?
`(17.54-17.24)/(17.24)=(20)/(m)xx(18)/(100)`
`(30)/(17.24)=(360)/(100M)`
`m=(360xx17.24)/(100xx30)rArr206.88`
Discussion
20697.

Which of the following interfaces cannot be obtained ?

Answer»

Liquid-liquid
Solid-liquid
Liquid-gas
Gas-gas

Solution :Gas-Gas MIXTURE is HOMOGENEOUS and does not have any INTERFACE.
Discussion
20698.

Write down the structures of the following compounds: (i) 2 - Iodoprapane (ii) Hex - 3 - yne (iii) pent - 1 - ene (iv) 2,2 - Dichloropropane (v) 1,1,1,2 - Tetrachloroethane (vi) propan - 2 - ol (vii) propane - 1 ,3 - diol (viii)Butane - 1,2,3, - triol. (ix) 2 - Methoxypropane (x) 2 - Methylpentanoic acid (xi) 2,2 - Dimethylbutanal (xii) Pentan - 3 - one (xiii) Butanoyl chloride (xiv) Acetic formic anhydride (xv) Ethyl methanoate (xvi) N - Methylmethanamine (xvii) N - Ethyl - N - methyl - ethanamine (xviii) Butanenitrile.

Answer»

Solution :(i) `CH_(3)CHICH_(3)`
(ii) `CH_(3)CH_(2)C -= C CH_(2)CH_(3)`
(iii) `CH_(3)CH_(2)CH_(2)CH = CH_(2)`,
(iv) `CH_(3)C CI_(2)CH_(3)`
(v) `CH_d(2)CI C CI_(3)`,
(vi) `CH_(3)CH(OH)CH_(3)`
(vii) HOCH_(2)CH_(2)CH_(2)OH`
(viii) `CH_(3)CH(OH)CH(OH)CH_(2)OH`
(IX) `CH_(3)CH(OCH_(3))CH_(3)`
(x) `CH_(3)CH_(2)CH_(2)CH(CH_(3))COOH`
(xi) `CH_(3)CH_(2)C(CH_(3))_(2)CHO`
(xii) `CH_(3)CH_(2)COCH_(2)CH_(2)CH_(2)`
(xiii) `CH_(3)CH_(2)CH_(2)COCI`
(xiv) `CH_(3)COOCHO`
(xv) `HCOOCH_(2)CH_(3)`
(xvi) `CH_(3)NHCH_(3)`
(xv) `HCOOCH_(2)CH_(3)`
(xviii) `CH_(3)CH_(2)CH_(2)CN`
Discussion
20699.

Which is the strongest reducing agent

Answer»

AG
Na
`Br^(-)`
`CU`

Solution :`Na to Na^(+) + e^(-) (-ve` SRP value ) has maximum oxidation potential and THUS EASILY GETS oxidised to each other .
Discussion
20700.

Which of the following compound obtain on oxidation of 2^(@) alcohol with H_(2)CrO_(4) or KMnO_(4) ?

Answer»

Aldehyde
Ketone
Ester
None of these

Solution :`R- UNDERSET(OH)underset(|)CH-R. underset(Na_2Cr_2O_7//H_2SO_4)OVERSET([O])to R- underset(O)underset(||)C-R.`
Discussion