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21051.

Which of the following drug is prepared from salysilic acid ?

Answer»

Aspirin
Methyl salisylate
(A) and (B) both
Paracetamol

Solution :(A) and (B) both
Discussion
21052.

Which enzyme catalyses the conversion of glucose into ethanol?

Answer»

maltase
invertase
diastase
ZYMASE

Solution :zymase
Discussion
21053.

Which of the following is correct order of leaving ability of the species

Answer»

`C_6H_5SO_3^(-) GT CH_3COO^(-) gt C_6H_5O^-`
`CH_3COO^(-) gt C_6H_5SO_3^(-) gt C_6H_5O^-`
`C_6H_5O^(-) gt CH_3COO^(-)gtC_6H_5SO_3^-`
`CH_3COO^(-) gt C_6H_5O^(-) gt C_6H_5SO_3^(-)`

Solution :More the stability of LEAVING groups more will be the leaving ability (RESONANCE effect in this CASE)
Discussion
21054.

Which of the following is polymide ?

Answer»

Teflon
Nylon 6,6
TERYLENE
Bakelite

Solution :Nylon 6,6 is a semicrystalline polymide. It is formed by the combination of monomers HEXAMETHYLENE diammine and adiopic acid. Terylene is a polyster, Teflon is a SYNTHETIC POLYMER while bakelite is a plastic
Discussion
21055.

When phosphorous trichloridie is hydrolysed with cold water it gives ……………..

Answer»

SOLUTION :phosporous ACID
Discussion
21056.

Which of the following polymers of glucose is stored by animals ?

Answer»

CELLULOSE
Amylose
Amylopectin
GLYCOGEN

Solution :Glycogen
Glycogen is a POLYMER of glucose found in liver, brain and MUSCLES of animals.
Discussion
21057.

The ultimate product obtained when glycerol reacts with oxalic acid at 533 K is ________.

Answer»

FORMIC ACID
glycerol oxalate
allyl ALCOHOL
ACROLEIN

ANSWER :C
Discussion
21058.

The realtive stabilities of metal carbonyls and their ions can be explained on the basis of a rule which is known as 18e^(-) rule. If number of valence shell electrons of the metal + number of electrons donated by bonded CO groups comes to be 18 electrons, then carbonyl is said to be stable. Some heteroleptic/noncarbonyl complexes also follow 18 electron rule. Identify the number of complexes following the rule. [Mn(CO)_(5)], [Co(CO)_(4)] [(eta^(5)-C_(5)H_(5))_(2)Fe], [(CO)_(5)(PF_(3))]^(+), [(eta^(5)-C_(5)H_(5)) [Cr(NO)_(4)], Fe(CO)_(2)Cl], [Fe(CO)_(2)(NO)_(2)], [Fe(CO)_(5)], [Mn_(2)(CO)_(10)]

Answer»

7
8
9
6

Solution :Except `[Mn(CO)_(5)]` and `[Co(CO)_(4)]`, all others FOLLOW.
Discussion
21059.

Which of the following is not present in RNA :

Answer»

Ribose
Uracil
Thymine
Phosphate

Answer :C
Discussion
21060.

The realtive stabilities of metal carbonyls and their ions can be explained on the basis of a rule which is known as 18e^(-) rule. If number of valence shell electrons of the metal + number of electrons donated by bonded CO groups comes to be 18 electrons, then carbonyl is said to be stable. Which of the following complexes are following 18e^(-) rule?

Answer»

`Ni(CO)_(4)`
`Fe(CO)_(5)`
`Cr(CO)_(6)`
`V(CO)_(6)`

ANSWER :A,B,C
Discussion
21061.

Two molar of He gas (gamma=5//3) are initially at temp 27^(@)C and occupy a volume of 20 litres. The gas is first expanded at constant pressure untill its volume is doubled. then it undergoes and reversible adiabatic change, unit the volume become 110 lit, then predict the value of T//1000 ( where T is the final temeperature ((4)/(11))^(2//3)=((1)/(2))

Answer»


SOLUTION :N//A
Discussion
21062.

Which of the following statement(s) are incorrect ?

Answer»

Those ADDITIONAL compounds which LOSE their identity in solution are called double salts.
In `K_(3)[Fe(CN)_(6)]Fe^(2+)` and `CN^(-)` IONS can give quantitive IDENTIFICATION test.
`[KAI(SO)_(4)_(2).12H_(2)O]` is a coordination compound
All acids are lewisacids and `sigma` donors.

Answer :B::C::D
Discussion
21063.

When a co-ordination compound COCl_(3).4NH_(3) is mixed with AgNO_(3). 1 mole of AgCl is precipitated per mole of the compound. Write Structural formula of the complex.

Answer»

Solution :Structural formula of the coordination compound is `[Co(NH_(3))_(4)Cl_(2)]^(+)Cl^(-)`
Discussion
21064.

Which of the following is isoelectronic pair?

Answer»

`I Cl_(2), ClO_(2)`
`BrO_(2)^(-), BrF_(2)^(+)`
`ClO_(2), BRF`
`CN^(-), O_(3)`

SOLUTION :Both `BrO_(2)^(-)(35+2xx8+1)=52 and BrF_(2)^(+)(35+2xx9-1)="52 ELECTRONS."`
Discussion
21065.

Which metal is sometimes found in native state ?

Answer»

Al
Cu
Fe
Mg

Answer :C
Discussion
21066.

What colour is observed when ZnO is heated ?

Answer»

YELLOW 
VIOLET 
GREEN 
BLUE 

ANSWER :A
Discussion
21067.

When a co-ordination compound COCl_(3).4NH_(3) is mixed with AgNO_(3). 1 mole of AgCl is precipitated per mole of the compound. Write IUPAC name of the complex.

Answer»

SOLUTION :IUPAC NAME : Tetraamminedichloridocobalt(III) CHLORIDE.
Discussion
21068.

When one mole of CoCl_(3).5NH_(3)was treated with excess of silver nitrate solution , 2 mol of AgCl was precipptated . The formula of the compound is :

Answer»

`[Co(Nh_(3))_(5)Cl_(2)]Cl`
`[Co(NH_(3))_(5)Cl]Cl_(2)`
`[Co(NH_(3))_(4)Cl_(2)](NH_(3))Cl`
`[Co(Nh_(3))_(3)](NH_(3))_(2)`

Answer :B
Discussion
21069.

Which of the following is more acidic:

Answer»

`H_2O`
`C_2H_5OH`
CH=CH
All have same ACIDIC nature

Answer :A
Discussion
21070.

When potassium dichromate is heated with conc. H_(2)SO_(4) and NaCl. Orange vapours are evolved due to :

Answer»

`CrO_(2)Cl_(2)`
`CrCl_(3)`
`Cl_(2)`
`CrO_(5)`

SOLUTION :`CrO_(2)Cl_(2)` chromyl CHLORIDE is FORMED.
Discussion
21071.

What are biodegradable polymers ? Give some examples.

Answer»

SOLUTION :These are decomposed by micro-organisms. In BIOLOGICAL systems, Examples: (i) POLY (GLYCOLIC ACID)
Discussion
21072.

Which one of the following complexes shows optical isomerism ?

Answer»

`[Co(NH_(3))_(3)Cl_(3)]`
`[Co(en_(2))Cl_(2)]Cl`
trans `[Co(en_(2))Cl_(2)]Cl`
`[Co(NH_(3))_(4)Cl_(2)]Cl` (en = ethylenediamine)

Solution :`[Co(NH_(3))_(3)Cl_(3)]` has two GEOMETRICAL isomers but both are OPTICALLY inactive due to PLANE of symmetry.
CIS `[Co(en)_(2)Cl_(2)]Cl` is optically active.
trans `[Co(en)_(2)Cl_(2)]Cl` is optically inactive due to plane of symmetry.
`[Co(NH_(3))_(4)Cl_(2)]Cl` has two geometrical isomers but both are optically inactive due to plane of symmetry.
Discussion
21073.

When arrangement of electrons leads to ferromagnetism?

Answer»

`uarruarruarruarr`
`uarruarruarruarr`
Both (a) and (B)
None

Answer :B
Discussion
21074.

Write short note on the following : The process which is used for highly electro positive metal.

Answer»

Solution :ELECTROLYTIC reduction is used for highly electro positive metals.
In this METHOD, fused metal ore is electrolysed and pure meal is deposited at CATHODE.
Eg : Al is OBTAINED by electrolysis of `Al_(2)O_(3)`.
`2Al_(2)O_(3) + 3C rarr underset("Cathode")(4Al) + underset("Anode")(3CO_(2))`
Discussion
21075.

What would be the solubility of AgCl in 0.1 M NaCl solution ? (K_(sp)" for AgCl"=1.2xx10^(-10))

Answer»

0.1 M
`1.2xx10^(-9)M`
`1.2xx10^(-6)M`
`1.2xx10^(-10)M`

ANSWER :B
Discussion
21076.

Which noble gas does not occur in nature?

Answer»

SOLUTION :RADON or RN.
Discussion
21077.

The standard enthalpies of formation of A(NH_(3)),B(CO_(2)),C(HI) and D(SO_(2)) are respectively -46.19,-393.4, +24.94 and -296.9 kJ mol^(-1). The increasing order of their stability is

Answer»

`BltDltAltC`
`CltAltDltB`
`DltBltCltA`
`AltCltDltB`

SOLUTION :More NEGATIVE the value of enthalpies of formation, more STABLE the PRODUCTS.
Discussion
21078.

When C_(2)H_(5)OH reacts with sodium metal, gas released is

Answer»

Oxygen
Chlorine
HYDROGEN
Nitrogen

Answer :C
Discussion
21079.

Which of the following enzyme is present in soya beans?

Answer»

UREASE
ZYMASE
pepsin
lactase

SOLUTION :urease
Discussion
21080.

What volume of oxygen at STP is required to affect complete combustion of 200 cm^(3) of acetylene and what would be the volume of carbon dioxide formed ?

Answer»

Solution :The chemical equation representing the combustion of acetylene is :
`underset("2 Vol.")(2C_(2)H_(2))+underset("5 Vol.")(5 O_(2))rarr underset("4 Vol.")(4 CO_(2))+2H_(2)O`
Step 1. To CALCULATE the volume of `O_(2)` at STP required to after complete combustion of `200 cm^(3)` of acetylene.
Applying Gay Lussac's Law of gaseous volumes,
2 Vol. of `C_(2)H_(2)` required `O_(2)` for complete combustion = 5 Vol.
`therefore 200 cm^(3)` of `C_(2)H_(5)` will require `O_(2)` for complete combustion `=(5)/(2)xx200=500 cm^(3)` at STP.
Thus, the volume of `O_(2)` required at STP.
Step 2. To calculate the volume of `CO_(2)` produced at STP.
Applying Gay Lussac's Law og faseous volumes, 2 Vol. of `C_(2)H_(2)` produce `CO_(2)=4` Vol.
`therefore 200 cm^(3)` of `C_(2)H_(2)` at STP will produce `CO_(2)=(4)/(2)xx200=400 cm^(3)` at STP
Thus, the volume of `CO_(2)` produced `= 400 cm^(3)` at STP.
Discussion
21081.

Which of the following has least electronegativity value?

Answer»

C
Al
Si
P

Answer :B
Discussion
21082.

Which of the following statement is correct for alcohols?

Answer»

They REACT only as a NUCLEOPHILE
They react only as an electrophile
They react both as a nucleophile and an electrophile
They NEITHER react as a nucleophile nor an electrophile

Answer :C
Discussion
21083.

Under what pressure conditions will CuSO_(4). 5H_(2)O become efflorescent at 25^(@)C ? Given CuSO_(4)*5H_(2)O(s) hArr CuSO_(4)* 3H_(2)O(s)+2H_(2)O"(vapour)", K_(p)=1.086xx10^(-4)"atm"^(2)" at "25^(@)C. Vapour pressure of water at 25^(@)C is 23.8 of Hg.

Answer»

3.64 mm HG
4.84 mm Hg
5.96 mm Hg
7.92 mm Hg

Solution :An efflorescent salt is one that loses `H_(2)O` to ATMOSPHERE
For the reaction,
`CuSO_(4)*5H_(2)O(s) hArr CuSO_(4)*3H_(2)O(s)+2H_(2)O`(vapour)
`K_(p)=(P_(H_(2)O))^(2)=1.086xx10^(-4)"atm"^(2)`
`(P_(H_(2)O))=1.042xx10^(-2)"atm"=8.92`mmHg
`therefore ` Given `P_(H_(2)O)` at `25^(@)C` (i.e. 23.8) mmHg `gt` 7.92 mmHg and THUS, reaction will proceed in backward direction, i.e.
`CuSO_(4)*3H_(2)O(s)+2H_(2)O"(vapour)" hArr CuSO_(4)*5H_(2)O(s)`
Thus `CuSO_(4). 5H_(2)O` will not act as efflorescent but on the contrary `CuSO_(2).3H_(2)O` will absorb moisture from the atmosphere under given conditions. The salt `CuSO_(4).5H_(2)O` will effloresce only on a dry when the partial pressure of moisture in the air is LESS than 7.92 mm or if relative humidity of air at `25^(@)C=7.92//23.8=0.333 or 33.3%`.
Discussion
21084.

Which is correct match :

Answer»

ANHYDRONE = anhydrous magnesium per chlorate
Pseudohalogen =CYANOGEN
goon conductor of electricity `=H_(2)F_(2)`
FLUOROSIS `= Ca^(+2) + 2F^(-)`

Solution :(a) anhydrone = anhydrous magnesium per chlorate (b) Pseudohalogen =Cyanogen (d) Fluorosis `=Ca^(+2) + 2F^(-)`
Discussion
21085.

Two prevent corrosion iron pipes carrying drinking water are coated with zinc. The process involved is

Answer»

ALLOY formation
Electroplating
Galvanising
Soldering

Answer :C
Discussion
21086.

Which of the following properties have greater magnitude in D_(2)O then of in H_(2)O-

Answer»

Viscosity
Surface tension
dielectric constant
latent HEAT of vaporisation

Answer :A::D
Discussion
21087.

Which one of the following is used in pacemakers, cameras and electronic watches ?

Answer»

Li-ion BATTERY
Leclanche CELL
Galvanic cell
MERCURY button cell

Answer :D
Discussion
21088.

Which of the following compounds will give positive test with Tollen's reagent

Answer»

Acetamide
Acetaldehyde
Acetic acid
Acetone

Solution :Tollen's reagent is ammonical SILVER nitrate solution. Its REACTING species is `Ag^(+)`. It oxidises aliphatic as well as aromatic aldehydes.
`R - CHO + Ag^(+) overset("Redox")UNDERSET("reaction")rarr RCOOH + Ag`
Discussion
21089.

Which of the following compounds is used in Gun powder?

Answer»

`NaNO_(3)`
`KNO_(3)`
`LiNO_(3)`
`MG(NO_(3))_(2)`

Answer :B
Discussion
21090.

Which is insoluble in water :

Answer»

GLUCOSE
CELLULOSE
FRUCTOSE
Sucrose

Answer :B
Discussion
21091.

Whichvitamin is richin cotton seed oil ,sunflower oil, wheatgerm oil andall vegetableoils ?

Answer»

VITAMIN C
Vitamin E
Vitamin A
Vitamin D

Answer :B
Discussion
21092.

Which of the following is most appropriately be called as geminal halide

Answer»

`CH_3CHCl_2`


ANSWER :A
Discussion
21093.

When the equation: Cr_(2)O_(7)^(2-) + H^(+)+ I^(-) to Cr^(3+) + I_(2) is balanced the correct coefficient for I^(-) (aq) is :

Answer»

8
6
10
3

Answer :B
Discussion
21094.

X-ray crystallography reveals many aspects of the structure of metal halldes. The radius ratio (r_(+)//r_(-)) is a useful parameter to rationalize their structure and stability. A table or radius ratio (r_(+)//r_(-)) for some alkali halide is given below :For a given anion, the graph for NaCl type structure levels off at low r_(+)//r_(-) values because of :

Answer»

cation - cation CONTACT ALONG the face DIAGONAL
anion - anion contact along the face diagonal
cation - anion contact along the CELL EDGE
None of the above

Answer :B
Discussion
21095.

What is buffer solution? Give an example for an acidic buffer and a basic buffer.

Answer»

SOLUTION :(i) Buffer is a solution which consists of a mixture of a weak ACID and its conjugate base (or) a weak base and its conjugate acid.
(ii) This buffer solution resists drastic CHANGES in its pH upon addition of a small quantity of acids(or) bases and this ABILITY iscalled buffer action.
(iii) Acids buffer solution: Solution containing acetic acid and sodium acetate.
Basic buffer solution: SOlution containing `NH_4O and NH_4Cl`.
Discussion
21096.

Which of the following is added in saving soap to prevent rapid drying

Answer»

ethanol
glycerol
dettol
rosin

Answer :B
Discussion
21097.

Which of the following can reduce aldehydes to hydrocarbons ?

Answer»

`NaBH_4`
`LiAlH_4`
`Zn-Hg//HCl`
`9 - BBN`

ANSWER :C
Discussion
21098.

X-ray crystallography reveals many aspects of the structure of metal halldes. The radius ratio (r_(+)//r_(-)) is a useful parameter to rationalize their structure and stability. A table or radius ratio (r_(+)//r_(-)) for some alkali halide is given below :Which among the halides LiBr, NaBr and RbBr is likely to undergo phase transition from NaCl type of CsCl type structure with change of temperature and/or pressure ?

Answer»

LIBR
NaBr
RbBr
NONE of the above

ANSWER :C
Discussion
21099.

Which of the following is a set of reducing agents :-

Answer»

`HNO_(3), Fe^(+2), Fe`
`F^(-) , Cl^(-), MnO_(4)^(-)`
`I^(-), Na, Fe^(+2)`
`Cr_(2) O_(7)^(-2), NaCl`

ANSWER :C
Discussion
21100.

Which of the following statements (s) is/ are true ........

Answer»

`NO_2` can be prepared by heating `PB(NO_3)_2`
`NO_2` is red brown gas
`NO_2` is paramagnetic
`NO_2` is a basic gas

Solution :a) `NO_2` can be prepared by heating `Pb(NO_3)_2, 2Pb(NO_3)_2rarr 2PbO+4NO_2+O_2`
B) `NO_2` Red brown colour gas c) `NO_2` contain 23 ELECTRONS
odd electrons containing compounds exhibit ..para MAGNETIC.. .
Discussion