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5001.

Which is least soluble in H_2O.

Answer»

`BeF_2`
`SrF_2`
`CaF_2`
`MgF_2`

ANSWER :B
Discussion
5002.

Which of the following will be most readily dehydratec in acidic conditions ?

Answer»




ANSWER :C
Discussion
5003.

Why are the numbers 6, 6 and 6 put in the names of nylon 6, 6 and nylon 6 ?

Answer»

Solution :Nylon 6, 6 is a polymer of adipic acid and hexamethylenediamine. Both the MONOMERS have 6 carbon ATOMS each.
Nylon 6 is a polymer of CAPROLACTAM which CONTAINS 6 carbon atoms.
Thus, the NUMBERS refer to the number of carbon atoms in monomers involved.
Discussion
5004.

Which one of the following is used to prepare combs and pens?

Answer»

navolac
soft BAKELITE
HARD bakelite
neoprene

SOLUTION :hard bakelite
Discussion
5005.

When acetyl chloride reacts with ethyl magnesium iodid it forms:

Answer»

ethyl methyl KETONE
DIETHYL ketone
ethyl acetate
ACETIC anhydride

ANSWER :C
Discussion
5006.

Which of the following characteristic features match(es) with the crystal systems: hexagonal and monoclinic?

Answer»

Both have the cell PARAMETERS a = b = C and `alpha=beta=gamma`
Both belong to DIFFERENT crystal systems
Both have only two crystallographic ANGLES of `90^(@)`
Both belong to same crystal system

Answer :B::C
Discussion
5007.

Which polymer is used in tyre and footwear industry ?

Answer»

Buna-S
Buna-N
VULCANIZE RUBBER
NONE of these

SOLUTION :Buna-S
Discussion
5008.

Which one is communicable disease ?

Answer»

Scurvy
Diabetes
Beri- beri
Cholera

Answer :D
Discussion
5009.

The second and third rows of transition elements resemble each other much more than they resemble the first row. Explain Why?

Answer»

Solution :The properties of elements of second row and THIRD row transition series are similar due to LANTHANOID contraction. As a result of lanthanoid contraction, they have ALMOST same atomic radii which is responsible for SIMILARITY in their properties.
Discussion
5010.

The vapour pressure of pure liquid A is 40 mm Hg at 310 K. The Vapour pressure of this liquid in solution with liquid with liquid B is 32mm Hg. Calculate the mole fraction of A in the solution if the mixture obeys Raoult's Law.

Answer»

<P>

Solution :`"Vapour PRESSURE of pure liquid A "(P_(A)^(@))=40MM.`
`"Vapour pressure of A in the solution "(P_(A))=32 mm.`
`"According to Raoults's Law" , X_(A)=P_(A)/P_(A)^(@)=((32mm))/((40mm))=0.8`
Discussion
5011.

Which of the following reaction is possible at anode ?

Answer»

`2Cr^(3+) + 7H_(2)O RARR Cr_(2)O_(7)^(2-) +14H^(+)`
`F_(2) rarr 2F^(-)`
`1/2 O_(2) +2H^(+) rarr H_(2)O`
None of these
Discussion
5012.

Which one of the following NOT give a primary alcohol on reduction ?

Answer»

PROPANOIC ACID
PROPANAL
METHYL propanoate
Propan-2-one

ANSWER :D
Discussion
5013.

Which of the following is/are correct for group 14 elements?

Answer»

The stability of dihalides are in the order `CX_(2) lt SiX_(2) lt GeX_(2) GT SnX_(2) lt PbX_(2)`
The ability to form `PPI-PPI` MULTIPLE bonds among temselves increases down the group
The TENDENCY for catenation decreases down the group
They all form oxides with the FOMULA `MO_(2)`

Answer :A::C::D
Discussion
5014.

Which of the following salts will five highest pH in water

Answer»

`Na_(2)CO_(3)`
`CuSO_(4)`
`KCL`
`NACL`

SOLUTION :Salt of strong base and weak acid.
Discussion
5015.

The main sugar present in honey is :

Answer»

SUCROSE
GLUCOSE
FRUCTOSE
MALTOSE

ANSWER :A
Discussion
5016.

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

Answer»

Solution :(i) Food PRESERVATIVES : Substances which prevent spoilage of food due to microbial growth are called food preservatives. Examples are table salt, sugar, VEGETABLE oils and sodium benzoate.
(ii) Synthetic detergents : Synthetic detergents are CLEANSING agents which have all the properties of SOAPS. These can be used in soft as well as HARD water.
Examples of detergents are as under :
Anionic detergentSodium laurylsulphate
Cationic detergentCetyltrimethyl ammonium bromide
Non-ionic detergentPolythylene glycol stearate
(iii) Antacids : Substances which neutralise excess acid in the stomach are called antacids. Examples of antacids are sodium hydrogensulphate and metallic hydroxides.
Discussion
5017.

[Ti(H_(2)O)_(6)]^(2+) is purple in colour. Prove this statement

Answer»

Solution :`(i)` In `[Ti(H_(2)O)_(6)]^(2+)`, the central metal ion is `Ti^(3+)` which has `d^(1)` configuration. This single electron occupies one of the `t_(2g)` orbitals in the octahedral aqua ligand field.
`(II)` When WHITE light falls on this complex, the d electron absorbs light and promotes itself to eg level.
`(iii)` The spectral data show the absorption maximum is at `20000cm^(-1)` corresponding to the crystal field splitting energy `(Delta_(0))239.7kJ mol^(-1)`. The transmitted colour ASSOCIATED with this absorption is PURPLE and hence the complex appears in purple in colour.
Discussion
5018.

Write the structures of A and B in the following reaction, CH_(3)COCl overset(H_(2),Pd-BaSO_(4))to A overset(H_(2)N-OH)toB

Answer»

SOLUTION :`underset("Acetyl chloride")(CH_(3)COCl) underset(("Rosenmun reduction")) OVERSET(H_(2)Pd-BaSO_(4))to underset("Acetaldehyde (A)")(CH_(3)CHO) underset(-H_(2)O)overset(H_(2)N-OH)to underset("Acetaldoxime (B)")(CH_(3)CH=NOH)`
Discussion
5019.

What name is given to neurologically active drugs ?

Answer»

SOLUTION :TRANQUILIZERS
Discussion
5020.

Which of the following is independent of Temperature ?

Answer»

MOLARITY
FORMALITY
NORMALITY
MOLALITY:

SOLUTION :Molarity
Discussion
5021.

Which of the following group 16 elementsexists in more than two allotropic states ?

Answer»

POLONIUM
TELLURIUM
SELENIUM
OXYGEN

SOLUTION :
Discussion
5022.

Which of the following metals may be present in the anode mud during electrorefining of copper?

Answer»

<P>P and Q
Q and S
P and R
R and S

Answer :C
Discussion
5023.

Which of the following properties is not shwon by NO ?

Answer»

It is dimagnetic in GASEOUS state
It is a NEUTRAL oxide
It combines with oxygen to form nitrogen dioxide
It's BOND order is 2.5

Answer :A
Discussion
5024.

Which of the following statement is true regarding the entropy of the universe?

Answer»

INCREASES and TENDS TOWARDS m aximum value
Decreases and tends to be zero
Remains constant
Decreases and increases with a PERIODIC rate

Answer :A
Discussion
5025.

Which typesof drugs come under antimicrobialdrugs ?

Answer»

SOLUTION :Disease in human beings and animals may be caused by a variety of microorganisms such as bacteria, VIRUS , FUNGI and other pathogens.
An ANTIMICROBIAL tends to destroy/prevent development or inhibits the pathogeric action of microbes such as bacteria (antibacterial drugs), fungi (antifungal agents), virus (antiviral agents), or other parasites (antiparasitic drugs) selectively. Antiseptic, disinfectants, antibiotics and sulphs drugs are animicrobial drugs.
Discussion
5026.

Who is called the father of chemistry

Answer»

Faraday
Priestley
Rutherford
LAVOISER

ANSWER :D
Discussion
5027.

Which of the following expression is correct for CsCltmit cell with lattice parameter a

Answer»

`r_(Cs)+r_(Cl^(-))=(3a)/(2)`
`r_(Cs)+r_(Cl^(-))=(sqrt(3)a)/(2)`
`r_(Cs)+r_(Cl^(-))=(a)/(sqrt(2))`
`r_(Cs)+r_(Cl^(-))=2a`

Solution :CsCI has a BEE structure ions TOUCHING ALONG BODY diagonal.
Discussion
5028.

Which of the following options are not in accordance with the property mentioned against them ?

Answer»

`F_(2) GT Cl_(2) gt Br_(2) gt I_(2)` - Oxidising POWER.<BR>`MI gt MBr gt MCl gt MF`- Ionic character of metal halide.
`F_2gt Cl_2 gt Br_2 gt I_2` - Bonddissociation enthalpy.
HI lt HBr lt HCL lt HFHydrogen-halogen BOND strength.

Solution :Bond dissociation enthalpy : `Cl_2 gtBr_2 gtF_2 gtI_2`
Ionic character of metal halide: MF > MCI > MBr > MI
Discussion
5029.

Under very high vaccum of the order of __________, it is now possible to obtain ultra clean surface of the metals.

Answer»

SOLUTION :`10^(-8) " to " 10^(-9)` PASCAL
Discussion
5030.

Write the names and symbols of the group 15(VA) elements.

Answer»

SOLUTION :Nitrogen(N), PHOSPHORUS (P), arsenic (As), antimony (Sb) and BISMUTH (Bi) CONSTITUTE group 15(or VA) of the periodic table)
Discussion
5031.

Whatis the commonality betweenthe antibiotic arsphenamine and azodye ?

Answer»

Solution :ARSPHENAMINE possesses -As = As- linkage which RESEMBLES -N=N- linkages in azo DYES
Discussion
5032.

Which of the following order is/are INCORRECT :-

Answer»

`MgCO_3 lt BaCO_3` (Thermal STABILITY )
LiF lt CSF (Solubility)
`Li_3N GT K_3N`(Thermal stability)
`MgSO_4 lt BaSO_4`(Solubility)

ANSWER :D
Discussion
5033.

What is Van't Hoff factor ? What possible values can it have If the solute molecules undergo dissociation?

Answer»

Solution :Van.t Hoff factor : Van.t Hoff introduced a factor .i. called Van.t Hoff factor, to express the EXTENT of association or dissociation in solution. It is the RATIO of normal and observed molar masses of the solute
`i=("Normal molar mass"(M_(n)))/("Observed molar mass"(M_(0)))`
In CASE of dissociation value of `i gt 1`
Discussion
5034.

Which of the following statement regarding the pair of complexes is/are incorrect ?

Answer»

Both `K_2[PdCl_4]` and `K_2[PT(o x )_3]` are optically inactive
Both `K_2[PdCl_4]` and `K_2[Pt(o x )_3]` do not form diastereomers
`K_2[Ni(CN)_4] and Co[Hg(SCN)_4]` have same hybridization of CENTRAL atom
`K_2[Ni(CN)_4] and Co[Hg(SCN)_4]` both can show same type of structural ISOMERISM and are diamagnetic

Solution :`[Pt(o x)_3]^(2-)` is optically active due to 3 didentate LIGANDS. `[PdCl_4]^(2-)` and `[Pt( o x)_3]^(2-)` do not show G.I as well ligands are same .
Hybridization of `Ni^(2+)` is `dsp^2` in `[Ni(CN)_4]^(2-)` and that of `Hg^(2+)` is `sp^3` in `[Hg(SCN)_4]^(2-)`
Both `CN^-` and `SCN^-` ligands are ambidentate. Hence both `[Ni(CN)_4]^(2-)` and `[Hg(SCN)_4]^(2-)` show linkage isomerism. `K_2[Ni(CN)_4]` is diamagnetic but `Co[Hg(SCN)_4]` is not as `Co^(2+)` is `d^7` -paramagnetic.
Discussion
5035.

Which of the following is most stable carbonium ion ?

Answer»

`CH_(3)CH_(2)^(+)`
`(CH_(3))_(3)C^(+)`
`CH_(3)^(+)`
`(CH_(3))_(2)CH^(+)`

Solution :Electron releasing inductive effect (+I effect) STABILISED t-butyl carbonium ion by partial neutralisation of positive charge on carbon.
Discussion
5036.

Write the type of isomerism exhibited by the following complexes: (i) [Co(NH_(3))_(5)Cl]SO_(4) (ii) [Co(en)_(3)]^(+3)(iii) [Co(NH_(3))_(6)][Cr(CN)_(6)]

Answer»

SOLUTION :(i) IONIZATION
(ii) OPTICAL
(III) Coordination ISOMERISM
Discussion
5037.

Which of the following is an antidiabatic drug?

Answer»

INSULIN
inulin
chloroquine
ASPIRIN

SOLUTION :insulin
Discussion
5038.

Which of the following polymer can be formed by using the monomer unit?

Answer»

NYLON 6, 6
Nylon-2-nylon-6
Melamine polymer
Nylon-6

Solution :The MONOMER is CAPROLACTAM which is used in the MANUFACTURE of nylon-6.
Discussion
5039.

Under different conditions nitration of phenol yields

Answer»

o-nitrophenol
p-nitrophenol
2, 4, 6-trinitro phenol
all of these

Answer :D
Discussion
5040.

Which one of the following complexes will have four isomers? (en = ethylenediamine)

Answer»

`[CO(en)(NH_(3))_(2)Cl_(2)]Cl` <BR>`[Co(PPh_(3))_(2)(NH_(3))_(2)Cl_(2)]Cl`
`[Co(en)_(3)]Cl_(3)`
`[Co(en)_(2)Cl_(2)]Br`.

Solution :The four isomers of `[Co(en)_(2)Cl_(2)]` Br are trans-isomer, cis-isomer (d- and L- isomers) and ionization isomer [Co(en)BrCl]Cl.
Discussion
5041.

Write the IUPAC name of the complex [Cr(NH_(3))_(4)Cl_(2)]^(+). What type of isomerism does it exhibit ?

Answer»

SOLUTION :Tetraamminedichlorochromium (III). It EXHIBITS GEOMETRICAL ISOMERISM.
Discussion
5042.

Which of the following compound can not reacts with hydroxylamine ?

Answer»




SOLUTION :We know that phenols show KETO-enol tautomerism and the stability of the keto form depends UPON the number of keto group (more the number of keto groups , higher will be stability of the keto tautomer).Thus trihydric phenols should exist in keto form in considerable amount but only when the TWO keto groups are not on adjacent carbon atoms which decreases - stability due to POSITIVE charge on adjacent carbon atoms .
Discussion
5043.

Which one of the following is the packing efficiency in fcc unit cell ?

Answer»

`74%`
` 52.61% `
`100%`
`68%`

ANSWER :A
Discussion
5044.

Which of the following will exhibit geometrical as well as optical isomerism ?

Answer»

`[Co(en)_(3)]^(3+)`
`mer-[Co(DIEN)Cl_(3)]`
`[PtCl_(6)]^(2-)`
`[Pt(GLY)_(2)Cl_(2)]`

ANSWER :D
Discussion
5045.

Which among the following is NOT a mineral iron?

Answer»

HAEMATITE
Magnesite
Magnetite
Siderite

Solution :Haematite, `(Fe_(2)O_(3))` Magnetite `(Fe_(3)O_(4))` and siderite `(FeCO_(3))` are the minerals of FE. But Magnesite `(MgCO_(3))` is a mineral of MG.
Discussion
5046.

Which of the following is used to kill microbs in human?

Answer»

`SO^(2)`
1% phenol
Valium
Oflaxcain

Answer :D
Discussion
5047.

The term platforming is

Answer»

PLATINUM painting
Flat SHEET of platinum
Platinum manufacturing
Platinum USED as a catalyst

Solution :Platforming is a PROCESS for manufacturing platinum.
Discussion
5048.

The volatile metal is :

Answer»

Ag
Cu
Zn
Fe

Answer :C
Discussion
5049.

Which products are obtained when phenyl ethanoate reacts in presence of Anh.AICI_(3)?

Answer»

o - HYDROXY ACETOPHENONE and p - Hydroxy acetophenone
o - METHOXY acetophenone and p - Methoxy acetophenone
o - Methyl acetophenone and p - Methyl acetophenone
o - ETHOXY acetophenone and p - Ethoxy acetophenone

Solution :o - Hydroxy acetophenone and p - Hydroxy acetophenone
Discussion
5050.

The two optical isomers given below are namely ?

Answer»

Enantiomers
Diastereomers
Position ISOMERISM
Meso compound

ANSWER :B
Discussion