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6601.

Which of the following pair is precipitated with (NH_4)_2CO_3 in the presence of basic medium ?

Answer»

`CU^(2+), PB^(2+)`
`Ni^(2+), Ca^(2+) `
`Ca^(2+), Ba^(2+) `
`Na^(+),K^(+)`.

Solution :Both belong to GROUP V.l
Discussion
6602.

Which is formed when benzylamine react with mitrous acid

Answer»

`C_(6)H_(5)OH`
`C_(6)H_(5)ON`
`C_(2)H_(5)N_(2)OH`
`C_(6)H_(5)CH_(2)OH`

SOLUTION :
Discussion
6603.

Which of the following reaction does not form an ether ?

Answer»

`C_6H_6OH+RBroverset("aq.NaOH)rarr`
`CH_3-underset(CH_3)underset(|)OVERSET(CH_3)overset(|)C-CH=CH_2+ROH+Hg("OOCCF"_3)_2overset(NaBF_4)rarr`
`(CH_3)_3"CCl"+C_2H_5O^(-)Na^(+)rarr`
`CH_3CH_2OHunderset(413K)overset(H_2SO_4)rarr`

ANSWER :C
Discussion
6604.

What is the function of insulin in the human body?

Answer»

Solution :It KEEPS the blood SUGAR LEVEL WITHIN a narrow range in human body.
Discussion
6605.

Which of the following order is /are INCORRECT

Answer»

`MgCO_(3)ltBaCO_(3)` (Thermal stability)
`LiFltCsF`(SOLIBILITY)
`Li_(3)NgtK_(3)N`(Thermal stability)
`MgSO_(4)ltBaSO_(4)`(Solubility)

Solution :NA
Discussion
6606.

Using valence bond theory, explain the following in relation to the complexes given below : [Mn(CN)_(6)]^(3-),[Co(NH_(3))_(6)]^(3+),[Cr(H_(2)O)_(6)]^(3+), [FeCl_(6)]^(4-) (i) Type of hybridisation (ii) Inner or outer orbital complex (iii) Magnetic behaviour (iv) Sping only magnetic moment value

Answer»

Solution :
(`Cl^(-)` is a weak LIGAND. ELECTRONS do not pair up)
`sp^(3)d^(2)`, outer orbital complex, paramagnetic, `mu=sqrt(4(4+2))=4.9` BM
Discussion
6607.

The specific rotation for the alpha-anomer of a carbohydrate is +29^(@) and that of beta-anomer is -17^(@). Due to mutarotation, the equilibrium specific rotation is +14^(@). The percentage of alpha-anomer is

Answer»

`67.4%`
`32.6%`
`70.67%`
`29.33%`

Solution :`67.4 %`
Let the MOLES of `alpha` -anomer at EQUILIBRIUM = a
The number of moles of `BETA`-anomer `=(1-a)`
`therefore""29a-17(1-a)=14`
`therefore""a=0.6739`
Discussion
6608.

Which of the following alkali metal ions in aqueous solution is the best conductor of electricity ?

Answer»

`CS^(+)`
`RB^(+)`
`K^(+)`
`LI^(+)`

ANSWER :A
Discussion
6609.

Which of the following will not give halo form test?

Answer»

ETHANAL
Ethanol
Propan-2-one
Pentan–3–one

Solution :Pentan–3–one
Discussion
6610.

Which reagent among the following CANNOT be used to convert alcohol to alkyl halide ?

Answer»

`Cl_2`
`SOCl_2`
`PBr_3`
`HCL`in the PRESENCE of `ZnCl_2`

ANSWER :A
Discussion
6611.

Which of the following curve is in accordance with Freundlich adsorption isotherm?

Answer»




ANSWER :C
Discussion
6612.

Whatcriterion isfollowed forselectionofthestationaryphasein chromatogrphy ?

Answer»

SOLUTION :Thestationaryphase isselectedin suchawaythattheimpuritiesaremorestronglyadsorbed on thestationaryphasethanelementto bepurified. Underthese CONDITIONS, whenthecolumn isextracted, theimpuritieswill beretainedbythestationaryphasewhilethepurecomponent iseasilyeluted.
Discussion
6613.

Which of the following pairs of elements have same number of electrons in their outermost shell?

Answer»

MN, Fe
Na, Sr
As, Bi
Se, Te

Answer :C::D
Discussion
6614.

Which compound has bond angle nearly 90^@ :

Answer»

`NH_3`
`H_2S`
`H_2O`
`CH_4`

ANSWER :B
Discussion
6615.

Write the principle of the following : Zone refining.

Answer»

SOLUTION :This method is based on the principle that impurities are more soluble in the melt than in the solid state of the metal. A circular heater is fixed at one end of a ROD of the impure metal. The molten zone MOVES along the heater which is MOVED forward. The impurities pass on into the molten zone. Ge and Si are REFINED by this method.
Discussion
6616.

Which is not a polyhalogen ?

Answer»

METHYL chloride
Dichloro METHANE
Chloroform
CARBON TETRACHLORIDE

Answer :A
Discussion
6617.

Which of the following set of combination is correct?

Answer»

I, iv, S
II, ii, Q
II, III, Q
IV, iv, S

Answer :C
Discussion
6618.

Which of the following set of combination is correct ?

Answer»

<P>`(I), (ii), (P)
(IV), (iii), (Q)
(IV), (ii), (Q)
(I), (iii), (P)

ANSWER :B
Discussion
6619.

Which of the following Lanthanoid is radioactive

Answer»

Cerium
Promethium
Thulium
Lutetium

Answer :B
Discussion
6620.

Which expression is correct for the work done in adiabatic reversible expansion of an ideal gas?

Answer»

`nRT ln V_2//V_1`
`C_V (T_2 - T_1)`
`P DELTA V`
`- int_1^2 PDV`

Solution :WORK DONE in adiabatic reversible EXPANSION of an ideal gas =` = C_V (T_2-T_1)` .
Discussion
6621.

What are the monomeric repeating units of Nylon 6 and Nylon 6, 6 ?

Answer»

Solution :The monomeric REPEAT unit of NYLON 6 is `-NH-(CH_(2))_(5) -overset(O)overset(||)(C) -` which is derived from caprolactam.
The monomeric repeat unit of Nylon 6, 6 is derived from TWO monomers, hexamethylenediamine and adipic acid and has the following STRUCTURE :
`-NH-(CH_(2))_(6) -NH-overset(O)overset(||)C-(CH_(2))_(4)-overset(O)overset(||)C-`.
Discussion
6622.

What would be the amount of polythene formed from 20 kg of calcium carbide from the reactions given below? CaC_2 + 2H_2O to Ca(OH)_2 + C_2H_2 HC-=CH+ H_2 overset(Pb-BaSO_4)to CH_2=CH_2 nCH_2 = CH_2 to underset("Polythene ")(--CH_2-CH_2 --)_n

Answer»

28g
6g
9kg
64kg

Solution :Molecular WEIGHT of `CaC_2=40 + 24=64`
64 KG of `CaC_2` gives , 24 + 4 = 28 kg of ethene
20 kg of `CaC_2` GIVE , `(28)/(64) XX 20 =( 7 xx 20)/(16) = (35)/(4) = 8.75 kg `
=9 kg polythene
Discussion
6623.

Zn, Cd and Hg are not regarded as transition metals. Give reason.

Answer»

SOLUTION :This is because these METALS or their IONS don.t have 1-9 to (n-1) d-electrons.
Discussion
6624.

Transition metals show high melting points why?

Answer»

Solution :(i) All the transition metals are hard,
(ii) Most of them are hexagonal CLOSE packed, cubic close packed (or) body centered cubic which are CHARACTERISTICS of true metals.
(iii) The maximum MELTING point at about the middle of transition metal series indicates that d configuration of favourable for strong inter atomic attraction.
(iv) Due to the strong metallic bonds, atoms of the transition elements are CLOSELY packed and held together. This leads to high melting point and BOILING point
Discussion
6625.

Which is the use of PHBV ?

Answer»

PACKAGING
ORTHOPAEDIC DEVICES
CAPSULES
All of these

SOLUTION :All of these
Discussion
6626.

What are different types of RNA which are found in cell?

Answer»

Solution :RNA molecules are classified according to their structure and fW1ction into THREE MAJOR types,
(i) Ribosomal RNA (rRNA)
(ii) Messenger RNA (MRNA)
(III) TRANSFER RNA (tRNA)
Discussion
6627.

Which of the following is the most acidic?

Answer»

Cyclohexanol
m-chlorophenol
Benzyl alcohal
Phenol

Answer :B
Discussion
6628.

The strain in bonds of cyclopropane is:

Answer»

`0^@ 44' `
`24^@ 44' `
`9^@ 44' `
`5^@ 16' `

ANSWER :B
Discussion
6629.

Which of the following does not react with fluorine :

Answer»

KR
AR
Xe
All of these

SOLUTION :Ar does not REACT with `F_2`
Discussion
6630.

Which of the following compounds can exist as geometrical isomers?

Answer»

`CH_(2)Cl-CH_(2)BR`
`CH_(2)=CHCl`
`CHBr=CHCl`
`CH_(2)Cl-CH_(2)Cl`

ANSWER :C
Discussion
6631.

What is the difference between multimolecular and macromolecular colloids? Give one example of each. How are associated colloids different from these two types of colloids ?

Answer»

Solution :Difference between associated colloids and multimolecular and macromolecular colloids :Multimolecular colloids are formed by the AGGREGATION of a large number of simple MOLECULES, macromolecular colloids are DUE to large size of the molecules themselves so large that their size lies in the colloidal range. However, associated colloids are formed by electrolytes. They dissociate into ions and these ions associate together to form ionic micelles whose size lies in the colloidal range, egy soaps. This happens above a particular concentration (CALLED critical micellisation concentration) and above a particular TEMPERATURE, called Kraft temperature.
Discussion
6632.

Which chemical cause inflammation and pain in tissue ?

Answer»

PROSTAGLANDINS
Tetracycline
Barbiturates
Histamine 

SOLUTION :Prostaglandins
Discussion
6633.

Vander Waals' equation of state is obeyed by real gases. For n moles of a real gas, the expression will be

Answer»

`(p/n +(NA)/(V^2) ) ( (V)/(n- b) ) = RT`
`( p + (an^2)/(V^2) ) (v - nb) = n RT`
`(p + (na)/(V^2) ) (nV - b) = NRT`
`(p+(na)/(V^2)) (nV + b) = nRT`

Answer :B
Discussion
6634.

When equal volume sof the following solutions are mixed, precipitation of AgCl(Ksp= 1.8xx10^(-10)) will occur only with

Answer»

`10^(-4)M (AG^+)" and "10^(-4)M (CL^-)`
`10^(-5)M (Ag^+)" and "10^(-5)M (Cl^-)`
`10^(-6)M (Ag^+)" and "10^(-6)M (Cl^-)`
`10^(-10)M (Ag^+)" and "10^(-10)M (Cl^-)`

Answer :A
Discussion
6635.

Thereonine is as naturally occuring amino acid that contains two sterogenic centers. (a) Label the two sterogenic centers in threorine. . (b) Draw all possible stereoisomers and assingn the R, S configuration to each isomer. (c) Only the 2S, 3R isomer of theronine occurs in nature. (Numberingbeing at the COOH group.). Which isomer in part (b) is naturally occurring?

Answer»


ANSWER :`(##GRB_CHM_ORG_HP_C02_E01_318_A01##)`
Discussion
6636.

Which series of elements should have nearly the same atomic radii?

Answer»

Na, K, Rb
Fe, CO, Ni
Li, Be, B
F, CI, Br

Answer :B
Discussion
6637.

What happens to boranes at high temperatures ?

Answer»

Solution :At high temperatures it forms higher boranes liberating HYDROGEN.
`5B_(2)H_(6) underset("U-tube")overset(388" K")to 2B_(5)H_(11)+4H_(2)`
`2B_(2)H_(6)overset(198-373" K")to B_(4)H_(10)+H_(2)`
`5B_(2)H_(6) underset("sealed tube")overset(373K)to B_(10)H_(14)+8H_(2)`
`5B_(2)H_(6)to overset(473-523K)to 2B_(5)H_(9)+6H_(2)`
`10B_(2)H_(6)overset(523K)to 2B_(5)H_(9)+2B_(5)H_(10)+11H_(2)`
`B_(2)H_(6)overset("Red hot")to 2B+3H_(2)`
Discussion
6638.

Which one of the following is not a unit of length?

Answer»

Angstrom
Light-year
Micron
Radian.

ANSWER :D
Discussion
6639.

Write Gatterman Koch reaction

Answer»

ALIPHATIC aldehyde
Aromatic ketone
Aliphatic ketone
Aromatic aldehyde

Answer :D
Discussion
6640.

The weight of urea to be dissolved in 100 g. of water to decrease the vapour pressure of water by 5% is

Answer»

20g
14.66g
15.24g
16.66g

Answer :D
Discussion
6641.

What type of isomerism is exhibited by the complex [Co(en)_3]^(3+) ?(en= ethane -1, 2-diammine)

Answer»

SOLUTION : OPTICAL ISOMERISM.
Discussion
6642.

Which of the following molecules is expected to rotate the plane polrized light?

Answer»




SOLUTION :The plane of polarized light is ROTATED by optically active COMPOUND, i.e. it should be CHIRAL.
So, (a) has chiral C-atom. So, it is optically active.
In (B), (c) and (d) plane of symmetry is present.
Discussion
6643.

What mass of propene is obtained from 34.0 g of 1- iodopropane on treating with ethanolic KOH, if the yield is 36% ?

Answer»


ANSWER :`3.024 ` G
Discussion
6644.

Which category of the synthetic detergents is used in toothpaste ?

Answer»

SOLUTION :ANIONIC detergents such as SODIUM lauryl SULPHATE, sodium dodecylbenzenesulphonate etc. are used in toothpaste.
Discussion
6645.

When Zn reacts with cone ,HNO_(3),then Zn(NO_(3)) and NO_(2) are formed , the reaction (s) involved in this process is/are

Answer»

Radox REACTION
Acid BASE reaction
ION exchange reaction
None

Answer :a,B
Discussion
6646.

Which of the following expressions is no correct ?

Answer»

`mu^(OO) = gamma_(+)lambda_(+)^(oo) + gamma_(-)lambda_(-)^(oo)`
`lambda^(oo) = (1)/(N+)lambda_(+)^(oo)+(1)/(n-)lambda_(+)^(oo)`
`lambda_("cation")^(oo) = u_("cation")^(oo) XX "FARADAY"`
`lambda_(anion)^(oo) = u_(anion)^(oo) xx faraday`

SOLUTION :`lambda_("anion")^(oo) = u_("anion")^(oo) xx "faraday"`
Discussion
6647.

While charging the lead storage battery

Answer»

`PbSO_(4)` anode is REDUCED to Pb.
`PbSO_(4)` cathode is reduced to Pb.
`PbSO_(4)` cathode is oxidised to Pb.
`PbSO_(4)` anode is oxidised to `PbO_(2)`.

Solution :`PbSO_(4)` DEPOSITED on anode is reduced to Pb. This electrode now ACTS as cathode during charging .
Discussion
6648.

Water is used in car radiators. In winter season, ethylene glycol is added to water so that water may not freeze. Assuming ethylene glycol to be non-volatile, calculate the minimum amount of ethylene glycol to be non-volatile, calculate the minimum amount of ethylene glycol that must be added to 6.0 kg of waterof prevent it from freezing at -0.30^(@)C. The molar depression constant of water is 1.86 K//m.

Answer»


Solution :`w_(1)=6000g, DeltaT_(f)=0.30^(@),K_(f)=1.86^(@)C`
`"Molar mass of ethylene glycol,"{:(CH_(2)OH),("|"),(CH_(2)OH):}(M_(2))="62 g mol"^(-1)`
`"SUBSTITUTE in the formula, M"_(2)=(1000K_(f)w_(2))/(w_(1)DeltaT_(f))." Calculate w"_(2)`.
Discussion
6649.

Which of the following graph correctly represents variation of P vs V for two gases CH_(4) and SO_(3) subjected to reversible adiabatic compression from same initial condition. (Assume that vibrational degrees of freedom are not active.)

Answer»




ANSWER :D
Discussion
6650.

Vinegar contains acetic acid nearly

Answer»

`6 - 10%`
`30%`
`12 - 15%`
`20%`

ANSWER :A
Discussion