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2051.

Which of the following are peroxoacids of sulphur ?

Answer»

`H_(2)SO_(5)` and `H_(2)S_(2)O_8`
`H_2SO_(5)` and `H_(2)S_2O_7`
`H_(2)S_2O_7` and `H_2S_2O_8`
`H_2S_2O_6` and `H_2S_2O_7`

SOLUTION :Both `H_2SO_5` and `H_2S_2O_8` have peroxy LINKAGES.
Discussion
2052.

Which compound of lanthanoid is used to produce very low temperature by magnetic effect?

Answer»

CERIUM dioxide
Oxides of Lanthanoids
Gradlinium sulphate
Cerium sulphate

Answer :C
Discussion
2053.

Which among the following compounds will form intra - molecular hydrogen bond ?

Answer»

ACETONE
Nitroethane
2,3-pentanedione
Benzaldehyde

Answer :C
Discussion
2054.

Which of the following exhibit only + 3 oxidation state ?

Answer»

U
Th
AC
Pa

Solution :Ac (89)` = [RN][6D^!][7s^2]`
Discussion
2055.

The Tyndall's effect associated with colloidal particles is due to

Answer»

PRESENCE of charge
scattering of LIGHT
absorption of light
REFLECTION of light

Answer :B
Discussion
2056.

Which of the following equations can't be obtained by the dimensional method? (k is a constant)

Answer»


ANSWER :ORES of iron namely, haemarite, MAGNETIC, SIDERITE and iron pyrites are magnetic and they can be SEPARATED from non-magnetic impurities by magnetic separtaton.
Discussion
2057.

Which of the following pairs is ( are ) correctly matched

Answer»

A haogen which is liquid at room temperature -bromine
The most electronegative element -fluorine
The most REACTIVE HALOGEN -fluorine
The strongest oxidising agent-iodine

Solution :`F_(2) , Cl_(2)` are gases, `Br_(2)` is a liquid , `I_(2)` is solid at room temperature.
Discussion
2058.

The thermal decomposition of HCO_(2)H is a first order reaction with a rate constant of 2.4xx10^(-3)s^(-1) at a certain temmperature. Calculate how long will it take for three-fourths of initial quantity of HCO_(2)H to decompose. ""[log 0.25= -0.6021]

Answer»

Solution :Write the equation for the first order
`t=(2.303)/(k)"LOG"([R]_(0))/(R )`
When three-fourths of `HCO_(2)H` decomposes, the AMOUNT of `HCO_(2)H` that remains is one-fourth
`i.e., R=([R]_(0))/(4)`
Substituting the VALUES in the first order equation, we have
`t=(2.303)/(2.4xx10^(-3)s^(-1)) "log"([R]_(0))/([R]_(0)//4)`
`=(2.303)/(2.4xx10^(-3)s^(-1))log4`
`=(2.303xx(0.6021))/(2.4xx10^(-3))=(2.303xx0.6021)/(2.4)xx10^(3)s`
`=578` seconds.
Discussion
2059.

Which of the following alkenes gives only acetic acid on oxidation with potassium permanganate solution

Answer»

Ethylene
1-butene
Propene
2-butene

Answer :C
Discussion
2060.

Which of the following is/are the hazardous pollutant(s) present in automobile exhaust gases? (i) N_(2) (ii) CO (iii) CH_(4) (iv) Oxides of nitrogen

Answer»

(ii) and (iii)
(i) and (ii)
(ii) and (IV)
(i) and (iii)

SOLUTION :CO and oxides or nitrogen are POISONOUS gases present in automobile exhaust gases
Discussion
2061.

What are the oxidation states of phosphorus in the following: (i) H_(3)PO_(3), (ii) PCl_(3), (iii) Ca_(3)P_(2), (iv) Na_(3)PO_(4), (v) POF_(3) ?

Answer»

<P>

Solution :(i) `H_(3)PO_(3) rArr (+3)`
(ii) `PCl_(3) rArr (+3)`
(iii) `Ca_(3)P_(2) (IV) `Na_(3)PO_(4) rArr (+5)`
(v) `POF_(3) rArr (+5)`
Discussion
2062.

Which of the following has the greatest dipole moment?

Answer»


METHYL IODIDE
Methyl CHLORIDE
Methyl bromide

Solution :NA
Discussion
2063.

What are high and low density polythenes ?

Answer»

Solution :High DENSITY polythene is obtained by coordination polymerization while LOW density polythene is obtained by free radical polymerization. High density polythene has linear structure while low density polythene than low density polythene. Therefore, high density polythene has greater toughness, hardness and tensile strength household PIPES, etc. while low density polythene is mainly used as a packaging material (in form of thin films and bags). as insulation for electrical wires and cables and ALSO for the manufacture of flexible pipes and SQUEEZE bottles.
Discussion
2064.

The total number of chiral centres present in the artificial sweetener Aspartam are

Answer»

1
2
3
4

Answer :B
Discussion
2065.

Which of the following nuclei is unstable ?

Answer»

`""_(5)^(10)B`
`""_(4)^(10)Be`
`""_(7)^(14)N`
`""_(8)^(16)O`

ANSWER :B
Discussion
2066.

Which poison the catalyst (Pd) at aldehyde stage in the reduction of acyl halide

Answer»

PCC
`BaSO_(4)`
`SnCl_(2)`
`CuSO_(4)`

Answer :B
Discussion
2067.

Which of the following is / are correctly matched ?

Answer»

`{:("Column-I(Metals)","Calumn-II(Process used for EXTRACTION)"),("TITANIUM","Kroll process"):}`
`{:("Column-I(Metals)","Calumn-II(Process used for extraction)"),("ALUMINIUM","Baeyer process"):}`
`{:("Column-I(Metals)","Calumn-II(Process used for extraction)"),("Chromium","Thermite process"):}`
`{:("Column-I(Metals)","Calumn-II(Process used for extraction)"),("SILVER","Mac-Arthur CYANIDE process"):}`

Answer :A::C::D
Discussion
2068.

Which one gives idoform test in Ethanol and n-Propanol and why does the other one not so?

Answer»


Solution :Ethanol gives iodoform test because on OXIDATION it gives `CH_(4)-overset(O)overset(||)(C )-H` i.e., it has `CH_(3)-overset(O)overset(||)(C )-` group whereas `n`.
Propanol on oxidation gives `CH_(3)-CH_(2)-overset(O)overset(||)(C )-H` which does not have `CH-overset(O)overset(||)(C )` group therefore it will not RESPOND to iodoform test.
Discussion
2069.

Zeeman effect refers to the

Answer»

splittingup ofthe lines in an emission spectrumin pressece of an external electronstatic FIELD
random scatteringof lightby COLLOIDAL particles
splittingupof the linesin an emission specturm in amagnetif field
emissionof electrons from METALS when LIGHT falls UPON them.

Solution :Zeema effect refers to splittingof lines of an emissionspectrumin magnetic field.
Discussion
2070.

Saturated solution of KNO_(3) is ued to make 'salt - bridge' because ,

Answer»

VELOCITY of `K^+` is greater than that of `NO_3^-`
Velocities of both `K^+ and NO_3^-` are NEARLY the same
Velocity of `NO_3^-` is greater than that of `K^+`
`KNO_3` is highly SOLUBLE in water

Answer :C
Discussion
2071.

When comparing the hydrogenation of benzene with that of a hypothetical 1, 3 5-cyclohexatriene, benzene _____ than the cyclohexatriene.

Answer»

ABSORBS 152kJ/mol more HEAT
GIVES off 152kJ/mol more heat
absorbs 152kJ/mol LESS heat
gives off 152kJ/mol less heat

Solution :BENZENE is aromatic therefore gives off 152 kJ/mol more heat
Discussion
2072.

Which combination is correct for Be metal

Answer»

<P>(I)(II)(R)
(II)(iii)(Q)
(III)(iv)(P)
(IV)(i)(S)

Solution :(I)No colour in FLAME test (Be)
BeO is Amphoteric oxide in nature
`(BeH_2)_n`

electron deficient and polymeric
(II)Violet colour in flame test ( K Metal)
`KO_2`(POTASSIUM super oxide ) is orange yellow
`KO_3`(Potassium ozonide) is orange-red solid
(III)yellow colour in flame test (NA metal)
`Na_2CO_3`(sodium carbonate ) is manufactured by solvay process
microcosmic salt `to Na(NH_4)HPO_4. 4H_2O`
Discussion
2073.

Two moles of acetic acid are heated with P_2O_5. The product formed is :

Answer»

2 moles of ETHYL alcohol
Formic ANHYDRIDE
Acetic anhydride
2 moles of METHYL cyanide

Answer :C
Discussion
2074.

Which of the following is used as antiseptic:

Answer»

`C_2H_5OH`
lodoform
Both (a) and (B)
NONE of these

Answer :C
Discussion
2075.

Which of the following trivalent ion has the largest atomic radii in the lanthanide series

Answer»

La
Ce
Pm
Lu

Solution :Lanthanum is the first element of Lanthanide SERIES so SIZE decreases with INCREASE in atomic NUMBER so La has the largest atomic radii.
Discussion
2076.

Which one of the following can shown optical isomerism ?

Answer»

`FeSO_(4).7H_2O`
`K_3[CR(C_2O_4)_3]`
`K_3[Fe(CN)_6]`
`Cr[(NH_3)_6]Cl_3`

Answer :B
Discussion
2077.

Which one among the followig is the strongest reducing agent Fe^(2+)+2e^(-)toFe(-0.44V) Ni^(2+)+2e^(-)toNi(-0.25V) Sn^(2+)+2e^(-)toSn(-0.14V) Fe^(3+)+e^(-)toFe^(2+)(-0.77V).

Answer»

FE
`Fe^(2+)`
`NI`
`Sn`

Solution :The reduction potential of Fe is very high, so it is a strongest REDUCING AGENT.
Discussion
2078.

The work done by the system is 8 joule, when 40 joule heat is supplied to it. What is the increases in internal energy of system.

Answer»

25 J
30 J
32 J
28 J

Solution :`q=40 J`
`w=8 J` (WORK DONE by the SYSTEM)
`DeltaE=q+w=40-8=32 J`
Discussion
2079.

Which of the following reaction represent major product.

Answer»




Solution :`-` `LiAlH_(4)` and `NaBH_(4)` are reducing agent
`-` `LiAiH_(4)` is stronger reducing agent that `NaBH_(4)`
`-` `NaBH_(4)` REDUCES group but not ESTER but `LiAlH_(4)` can REDUCE group & ester group both.
Discussion
2080.

Which type of chemical is Vitamin K

Answer»

QUINONE
QUINOL
quinal
PHENOL

ANSWER :A
Discussion
2081.

Thermite a mixture used for welding is :

Answer»

FERRIC oxide and ALUMINIUM powder
Fe and Al
Barium PEROXIDE and MAGNESIUM powder
Cu and aluminium

Answer :A
Discussion
2082.

What is the possible number of monohydroxy derivatives of hydrocarbon consisting of five carbon atoms with one methyl group as a branch?

Answer»

2
3
4
5

Solution :(i) `CH_(3)-overset(CH_(3))overset(|)(CH)-CH_(2)-CH_(2)-OH`
(II) `CH_(3)-overset(CH_(3))overset(|)(CH) -underset(OH)underset(|)(CH)-CH_(3)`
(iii) `CH_(3)-overset(CH_(3))overset(|)underset(OH)underset(|)C-CH_(2)-CH_(3)`
(iv) `underset(OH)underset(|)(CH_(2)) -overset(CH_(3))overset(|)(CH) - CH_(2) - CH_(3)`
Discussion
2083.

Which among these can exhibit tautomerism ?

Answer»

a only
B only
C only
a and c

Answer :D
Discussion
2084.

Which of the following is an antidepressant?

Answer»

Ibuprofen
Tetracycline
Aspirin
Veronal

ANSWER :D
Discussion
2085.

Which of the following elements are present in group 16 of the periodic table?

Answer»

Sulphur
ARSENIC
TELLURIUM
Silicon

SOLUTION :Elements present in group 16 are O, S, Se, TE, Po, Lv.
Discussion
2086.

Which of the following is not a fat-soluble vitamin ?

Answer»

VITAMIN K
Vitamin E
Vitamin A
Vitamin C

SOLUTION :Vitamin C
Discussion
2087.

Which of the following electrophile is the most reactive species ?

Answer»




ANSWER :A
Discussion
2088.

The resistance of 0.1N KCl solution is found 702Omega awhen measured in a conductivity cell. The specific conductance of 0.1N KCl is 0.14807 Omega^(-1)m^(-1). Calculate the cell constant.

Answer»


ANSWER :`103.9m^(-1)`
Discussion
2089.

Which of the following diagram is correctly related to refining of gold?

Answer»




Solution :Gold obtained from ectraction steps contains SILVER, COPPER zinc and sometimes lead as impurities.
Cuppelation`rarr` zinc and lead are oxidised and ore blown off.
Parting PROCESS `rarr` Removel to impurities of silver and copper
Miller's process `rarr` To remove chlorine ELECTROLYTIC refining.
Discussion
2090.

Transition elements form complexes due to

Answer»

SMALL size
High nuclear CHARGE
Presence of VACANT d ORBITALS
All the above

Answer :D
Discussion
2091.

What are the limitations of Freundlich adsorption isotherm?

Answer»

SOLUTION : (i) The Freundlich adsorption isotherm is purely empirical and VALID over a limited pressure range.
(II) The values of constants .k. and .n. ALSO found VARY with temperature. No theoritical explanations were given.
Discussion
2092.

What is the action of acetic anhydride onethyl amine ?

Answer»

Solution :ACETIC anhydride on reaction with ethylamine forms monoacetyl derivativeN-ethyl acetamide.
`UNDERSET("ethyl amine")(C_(2)H_(5)NH_(2))+underset("acetic anhydride")((CH_(3)CO)_(2)O) underset(Delta)overset("pyridine")to underset("N-ethyl acetamide")(C_(2)H_(5)NH-overset(O)overset("||")C-CH_(3))+CH_(3)COOH`
Discussion
2093.

Which one of the following statements for order of reaction is not correct?

Answer»

Order can be determind experimentally
Order of reaction is equal to SUM of the power of CONCENTRATION term is differential rate law
It is not affected with stoichimetric coeffcient of the REACTIONS
Order cannot be frational

Solution :‘a’ , ‘b’ and ‘c’ are correct for order of reaction but ‘d’ is not correct because order of a reaction can be in FRACTION or zero or complete positiveand negative number.
Discussion
2094.

Which of the following is chalcopyrite?

Answer»

`CuFeS_2`
`Fes_2`
`KMgCl_3.6H_2 O`
`Al_2O_3 .2H_2O`

SOLUTION :CHALCOPYRITE`: Cu FeS_2`
Fool.sgold`: Fe S_2`
Carnalite`:K< g Cl _3 . 6 H_2 O`
BAUXITE`: Al_2 O_3.3H_2 O`
Discussion
2095.

Which element occur in native state

Answer»

I
S
P
MG

Solution :SULPHUR OCCURS in native state NEAR VOLCANOES.
Discussion
2096.

Which of the folloiwng are D sugars?

Answer»




ANSWER :A::C::D
Discussion
2097.

Which of the following monomers would produce the condensation polymer below?

Answer»




ANSWER :C
Discussion
2098.

Which of the following compounds on reaction with H_2SO_4" gives "H_2O_2?

Answer»

`PbO_2`
`MnO_2`
`SnO_2`
`BaO_2`

ANSWER :D
Discussion
2099.

Which one of the following is used in automobiles, trains and in inverters?

Answer»

Lithium ion battery
Mercury button CELL
LEAD storage battery
Leclanche cell

Answer :C
Discussion
2100.

Which of the following reactions taking place in the blast furnace during extraction of iron is endothermic?

Answer»

`2C+O_2 to 2CO`
`CO_2+C to 2CO`
`C+O_2 to CO_2`
`Fe_2O_3 + 3CO to2Fe+ 3CO_2`

SOLUTION :`CO_2+C to 2CO , DELTAH`= + 163.2 KJ
Discussion