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22801.

What weight of hydrated oxalic acid should be added for complete neutralisation of 100 ml of 0.2N - NaOH solution

Answer»

0.45 g
0.90 g
1.08 g
1.26 g

Solution :For complete neutralization EQUIVALENT of axalic acid = equivalent of NaOH =
`(w)/(eq.wt)=(NV)/(1000) therefore (w)/(63)=(0.2xx100)/(1000)RARR w=1.26 gm`.
Discussion
22802.

Which statement about the form of mannose is not correct?

Answer»

It exists as two anomeric stereoisomers
It REACTS with TOLLENS' reagent to GIVE a silver
Reaction with excess `CH_(3) I` and AgOH gives a non-reducing penta-O-methyl derivative
It resists reduction with AQUEOUS sodium borohydride.

Solution :Mannoseisfarily REDUCED by aqueoussodiumborohydride into manntionl
Discussion
22803.

Which base is present in R.N.A but not in DNA ?

Answer»

URACIL
CYTOSINE
GUANINE
THYMINE

ANSWER :A
Discussion
22804.

Which is soluble in ammonia ?

Answer»

`CR(OH)_3`
`Cu(OH)_2`
`FE(OH)_3`
`Al(OH)_3`

Answer :B
Discussion
22805.

Which of the following is not a favourable condition for physical adsorption:

Answer»

High temperature
High pressure
Higher CRITICAL temperature of adsorbate
Low temperature.

Solution :Physical ADSORPTION TAKES place at i temperature below boiling POINT of adsorbate `a^(**)` the temperature increases in process physisorption decreases.
Discussion
22806.

The solubility of ether in water is similar that of -

Answer»

ALCOHOL having same MOLECULAR WEIGHT
Phenol having same molecular weight
Ester having same molecular weight
KETONE having same molecular weight

Solution :Alcohol having same molecular weight
Discussion
22807.

Which of the following ions form a white ppt. with ammonium oxalate?

Answer»

`CA^(+2)`
`SR^(+2)`
`BA^(+2)`
`FE^(+2)`

Solution :`Ca^(2+), Sr^(+2), Ba^(+2)`
Discussion
22808.

What is denoted by [H_(9)O_(4)]^(+) ion ? Explain.

Answer»

Solution :High charge density and high hydration energy of `H^(+)` ion (proton) cause the `H^(+)` ion to remain solvated to form hydroxonium ion or HYDRONIUM ion (`H_(3)O^(+)`). Hydronium ion again forms HYDROGEN bonds with three water molecules and remain solvated. THEREFORE, in water, aproton actually forms `[H_(3)O(H_(2)O)_(3) ]^(+) ""or [H_(9) O_(4)]^(+)`ion.
Discussion
22809.

Which of the following is not a substitutional solid?

Answer»

Brass
Brozne
STEEL
MONEL metal

Solution :Steel is an interstitial solid in which iron atoms OCCUPY LATTICE sites and C-atoms occupy interstitial sites.
Discussion
22810.

Various types of one in the blast bumace are given in the List and reactions take place traction of iron are given in List II {:("List-I","List-II"),((1)"Zone of reduction",(a)C+O_(2) to CO_(2)),((2)"Zone of heat absoroption",(b) CO_(2)+C to 2CO),((3)"Zone of fusion",(c) Fe_(2)O_(3)+3CO to 2Fe+3CO_(2)):}

Answer»

`{:(1,2,3),(a,B,C):}`
`{:(1,2,3),(c,b,a):}`
`{:(1,2,3),(b,c,a):}`
`{:(1,2,3),(c,a,b):}`

ANSWER :B
Discussion
22811.

Write the names and structures of the monomers of the following polymers : (i) Buna -S (ii) Buna -N (iii) Dacron (iv) Neoprene.

Answer»

Solution :The names and structures of the monomers are :
(i) Buna-S : `CH_(2)=underset(1,3-"Butadiene")(CH-CH=CH_(2)) and underset("Stryene")(C_(6)H_(5)-CH=CH_(2))`
(ii) Buna -N : `CH_(2)=underset(1,3-"Butadiene")(CH-CH_(2)) and CH_(2)=underset("Acrylonitrile")(CH-CN)`
(iii) NEOPRENE : `underset("Chloroprene or 2-chloro-1,3-butadiene")(CH_(2)=overset(CI)overset(|)(C)-CH=CH_(2)`)
(IV) Dacron :`underset("Ethylene glycol")(HO-CH_(2)-OH and)`
Discussion
22812.

Why actinides are not affected by nitric acid ?

Answer»

Solution :Actinide on reaction with concentrated NITRIC ACID forms a protective OXIDE film. Hence it is SLIGHTLY AFFECTED
Discussion
22813.

Which one of the following is a synthetic polymer ?

Answer»

STARCH
PROTEIN
NEOPRENE
Silk

Answer :C
Discussion
22814.

Which metal is used in galvanizing ?

Answer»

ZINC 
ALUMINIUM 
IRON 
COPPER 

ANSWER :A
Discussion
22815.

Wrong statement among the following is

Answer»

effective collisions are more if activation energy is less
zero order reaction proceeds at a constant RATE independent of concentration or time
REACTIONS with highest rate constant value have LOWEST activation energies
if initial concentration increases half life decreases in zero order

ANSWER :D
Discussion
22816.

The required time to liberate one gram equivalent of an element by passing one ampere current through its solution is

Answer»

6.7 hrs
13.4 hrs
19.9 hrs
26.8 hrs

Solution :1 G EQ. requires 1F of `96500^(@)C`
`Q=Ixxt.` but 1=1 A`thereforet=96500s=(96500)/(60xx60)=26.8` hrs
Discussion
22817.

Which may be added to one litre of water to act as a buffer

Answer»

One mole of `HC_(2)H_(3)O_(2)` and 0.5 mole of NAOH
One mole of `NH_(4)Cl` and one mole of HCl
One mole of `NH_(4)OH` and one mole of NaOH
One mole of `HC_(2)H_(3)O_(2)` and one mole of HCl

Solution :One mole OXALIC ACID & 0.5 mole of NaOH will MAKE.
Discussion
22818.

Which structural unit present in a detergent makes it non-biodegradable?

Answer»

Solution :If the hydrocarbon CHAIN in the DETERGENT is highly BRANCHED, then the bacteria cannot DEGRADE it. That is, it becomes non-biodegradable.
Discussion
22819.

Which of the following is a vitamin:

Answer»

Riboflavin
Thyroxine
Adrenaline
Guanine

Answer :A
Discussion
22820.

Which of the following is used to treat respiratory tract infections, genital, gastrointestinal tract and skin infections?

Answer»

AMPICILLIN
penicillin
terfenadine
AZITHROMYCIN

Solution :azithromycin
Discussion
22821.

Which one is a broad spectruin antibiotic ?

Answer»

CHLORAMPHENICOL
PENICILLIN G
Phenol
Formalin

ANSWER :A
Discussion
22822.

What is the major product in the reaction?

Answer»



`MeOoverset(14)(C)H_(2)CH_(2)CH_(2)Cl`
`H_(2)overset(14)(C)OHCH_(2)CH_(2)OM e`

Answer :A
Discussion
22823.

The test for unsaturation is confirmed by the decolourisation of which of the following

Answer»

iodine water
`CuSO_4` solution
BROMINE water
All of these

Solution :By adding bromine water to a solution, if the colour of bromine water decolourise then the COMPOUND is UNSATURATED . This is a CONFIRMATORY test for unsaturation.
Discussion
22824.

Which of the following are redox reactions?

Answer»

`BaCI_2 + H_2SO_4to BaSO_4+2HCI`
`2CuI_2to2Cul +I_2`
`NH_3CI+ NaOHtoNaCI+NH_3+H_2O`
`snCI_2 +2HgCI_2 toSnCI_4 +Hg _2CI_2`

Solution :In theoption(a) and (C )thereis nochangeinoxidisationnumberof ANYOF theelement ISFOUND .
Discussion
22825.

Which one of the following cyano complexes exhibit the lowest value of paramagnetic behaviour ?

Answer»

`[CR(CN)_6]^(3-)`
`[MN(CN)_6]^(3-)`
`[Fe(CN)_6]^(3-)`
`[Co(CN)_6]^(3-)`

Answer :D
Discussion
22826.

What are promoters and poisons ?

Answer»

Solution :PROMOTERS are substances that enhance the activity of a catalyst. For example in the MANUFACTURE of AMMONIA, iron acts as a catalyst. Molybdenum acts as a promoter in this case.
POISONS are substances that decrease the activity of a catalyst. For example, CO acts as a POISON in the manufacture of ammonia by Haber.s process.
Discussion
22827.

Your are supplied with the following substances: copper rod, Zinc rod, Salt bridge, two glass beakers, a piece of wire, 1M, CuSO_4 solution ,1M znso4 solution Calculate the standard EMF of the cell if E0

Answer»

Solution :`E_(cell)^@=E_(CATHODE)^@=R_(ANODE)^@=0.34--0.79=1.1V`
Discussion
22828.

Which metal is powdered, suspended in oil and used as paint ?

Answer»

Fe
Sn
Ag
Al

Answer :D
Discussion
22829.

Which of the following statements, about the advantage of roasting of sulphide ore before reduction is not true ?

Answer»

`DeltaG_(F)^(@)` of sulphide is greater than those for `CS_(2)` and `H_(2)S`.
`DeltaG_(f)^(@)` is NEGATIVE for roasting of sulphide ORE to oxide.
Roasting of the sulphide to its oxide is thermodynamically feasible.
Carbon and hydrogen are suitable reducing agents for metal SULPHIDES.

Solution :Carbon and hydrogen are suitable reducing agents for metal sulphides.
Discussion
22830.

Which of the following reactions are disproportionation reactions ?

Answer»

`Cu^(+) rarr Cu^(2+) + Cu`
`3MnO_(4)^(-) + 4H^(+) rarr 2MnO_(4)^(-) + MnO_(2)+ 2H_(2)O`
`2KMnO_(4) +rarr K_(2)MnO_(4) + 2H_(2)O`
`2MnO_(4)^(-) + 3Mn^(2+) + 2H_(2)O rarr 5MnO_(2) + 4H^(+)`

Solution :In (i) , `Cu^(+)` is OXIDIZED as well asreduced. In (ii) , `MnO_(4)^(-)` ions are oxidised as well as REDUCED.
Discussion
22831.

What is racemic mixture ?

Answer»

Solution :EQUIMOLAR mixture of dextrorotatory and laevorotatory isomers of the same COMPOUND is called RACEMIC mixture.
Discussion
22832.

Write the steps and conditions involved in the following conversion. Propane to acetone

Answer»

SOLUTION :
Discussion
22833.

Which one of the following is fluorspar

Answer»

`CaF_(2)`
CaO
`H_(2)F_(2)`
`CaCO_(3)`

ANSWER :A
Discussion
22834.

The total number of tertiary carbon atoms in 4, 5-dimethyl-2-hexanol is :

Answer»

Two
Three
One
Four

Solution :`H-underset(H)underset(|)OVERSET(H)overset(|)(C)""^(6)-underset(CH_(3))underset(|)overset(H)overset(|)(C)""^(5)-underset(CH_(3))underset(|)overset(H)overset(|)(C)""^(4)-underset(H)underset(|)overset(H)overset(|)(C)""^(3)-underset(OH)underset(|)overset(H)overset(|)(C)""^(2)-underset(H)underset(|)overset(H)overset(|)(C)""^(1)-H`
two `3^(@)` carbon atoms (4 and 5)
Discussion
22835.

Which of the following topics is not covered by surface chemistry ?

Answer»

ELECTROLYSIS
Adsorption
Colloids
Enzyme catalysis

Solution :Electrolysis
Discussion
22836.

What is the minimum pH required to prevent the precipitation of ZnS in a solution which is 0.01 M ZnCl_2 and saturated with 0.1 M H_2S ? K_(sp)" of " (ZnS)=10^(-21),K_(a_1)xxK_(a_2)(H_2S)=10^(-20)

Answer»

0
1
2
4

Answer :B
Discussion
22837.

Which of the following statement is true :-

Answer»




SOLUTION :
Discussion
22838.

Which one is most reactive towards electrophilic reagent?

Answer»




Solution :Electron donating effect decreases in the order: `OH GT OCH_(3) gt NHCOCH_(3) gt CH_(3) gt CH_(2)OH`.
therefore, OH is the most STRONGLY electron-donating group and hence o-cresol (b) is most reactive towards ELECTROPHILIC reagent.
Discussion
22839.

Which of the following alcohols is expected to have the lowest pK_(a) value ?

Answer»

ETHANOL
2-Fluoro ethanol
2,2,2-Trifluoroethanol
2-Chlorocthanol

Answer :C
Discussion
22840.

Why are halogens strong oxidising agents ?

Answer»

Solution :Due to low BOND dissociation enthalpy, high electronegativity and large negative electron gain enthalpy, halogens have a strong tendency to ACCEPT ELECTRONS and thus get reduced.
`X + E^(-) to X^(-)`
In other words, halogens act as strong oxidising agents. Their oxidising POWER, however, decreases from `F_2 " to "I_2` as is evident from their electrode potentials:
`E_(F_2//F^(-))^(@) = +2.87 V, E_(Cl_2//Cl^(-))^(@) = + 1.36 V `,
`E_(Br_2//Br^(-))^(@) = + 1.09 V and E_(I_2//I^(-))^(@) = + 0.54 V`
Thus , `F_2 ` is the strongest while `I_2 ` is the weakest oxidising agent.
Discussion
22841.

What happens when the following compounds are treated with dilute NaOH solution in cold? (CH_(3))_(3)C-CHO

Answer»

Solution :`(CH_(3))_(3)C-CHO` :
`CH_(3)-underset(CH_(3))underset(|)overset(CH_(3))overset(|)(C)-CHOunderset("Cannizzaro REACTION")overset("dil. "NaOH)tounderset("2,2 diemthy-1-propanol")(CH_(3)-underset(CH_(3))underset(|)overset(CH_(3))overset(|)(C)-CH_(2)OH)+underset("2,2-dimethyl SODIUM propionate")(CH_(3)-underset(CH_(3))underset(|)overset(CH_(3))overset(|)(C)-COONa)`
Discussion
22842.

What is the repeating unit in the condensation polymer obtained by combining HO_(2) C CH_(2)CH_(2)CO_(2)H (Succinic acid) and H_(2)NCH_(2)CH_(2)NH_(2) ( ethylene diamine) ?

Answer»

SOLUTION :`[-NHCH_(2)CH_(2)NHCOCH_(2) CH_(2)CO-]_(N)`
Discussion
22843.

When acetamide is hydrolysed by boiling with acid, the product obtained is

Answer»

Acetic acid
Ethylamine
Ethanol
Acetamide

Solution :The amino group is replaced by OH group with the evolution of NITROGEN when TREATED with nitrous acid `(NaNO_(2)+HCl)` i.e., acetic acid is formed `CH_(3)CONH_(2)+HNO_(2)rarrCH_(3)COOH+N_(2)+H_(2)O`
Discussion
22844.

Vitamin B2 is also known as

Answer»

Riboflavin
Thiamine
Nicotinamide
Pyridoxine

ANSWER :A
Discussion
22845.

What happens when chromates are kept in acidicsolution and dichromats in the alkaline solution ?

Answer»

Solution :Chromates in the ACIDIC solution are convertedinto dichromates ANDTHUS the colourbecomes ORANGE whereas dichromatesin the alkalinesolution are converted into chromates and the colour BECOMES yellow.
Discussion
22846.

WriteIUPACnameof (p ) O_2 N -C_6H_4- OCH_3

Answer»

SOLUTION :1-methyoxy-4- NITROBENZENE
Discussion
22847.

Which one of the following binds to the receptor site should inhibit its natural function?

Answer»

ANTACIDS
ANTIOXIDANT
antibiotics
ANTAGONISTS

Solution :antagonists
Discussion
22848.

Which of the following ligands are of sigma -donor and pi- acceptor type? (i) C_(2)H_(2), (ii) C_(2)H_(4), (iii) CO, (iv) barCN, (v) (sigma - C_(3)H_(5)^(-))

Answer»

(i), (III) only
(iii) & (iv) only
(iii), (iv) & (V) only
(i) & (II) only

Answer :B
Discussion
22849.

What is the value of K_a such that K_afor an acid is equal to K_bfor its conjugate base at 25^@C ?

Answer»

SOLUTION :`1 XX 10^(-7)`
Discussion
22850.

The van't Hoff factor i for a compound which undergoes dissociation in one solvent and association in other solvent is respectively

Answer»

GREATER than ONE and greater than one
LESS than one and greater than one
less than one and less than one
greater than one and less than one

Answer :D
Discussion