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21451.

Which of the following is correct :-

Answer»




ALL

Answer :D
Discussion
21452.

Which among the following vitamins is also known as riboflavin?

Answer»

`B_1`
`B_6`
`B_2`
`B_(12)`

ANSWER :C
Discussion
21453.

Which one of the following reactions will occur on heating AgNO_(3) above its melting point

Answer»

`2AgNO_(3)rarr 2Ag+2NO_(2)+O_(2)`
`2AgNO_(3)rarr 2Ag+N_(2)+3O_(2)`
`2AgNO_(3)rarr2AgNO_(2)+O_(2)`
`2AgNO_(3)rarr 2Ag+2NO+2O_(2)`

Solution :Melting point of `AgNO_(3)` is `212^(@)C`
`2AgNO_(3)overset(Delta,Tgt212^(@)C)rarr2AgNO_(2)+O_(2)`
Discussion
21454.

Which one of the following reactionsdoes notyield an alkalyl halide

Answer»

DIETHYL ether `+CI_2` (in the dark)
Diethyl ether `+HI`
Diethyl ether `+PCI_5`
Diethyl ether `overset("Reduction")to Xoverset(SOCI_(2))to`

SOLUTION :`CH_3CH_2-O-CH_2CH_3+CI_2overset("dark")to`
`CH_3CH_2-O-overset(CI)overset(|)CH-CH_3`
Discussion
21455.

The standard reduction potentials of 4 elements are given below . Which of the following will be the most suitable oxidising agent ? {:( I = -3.04 V "," ,, II = -1.90 V) , (III = 0 V "," ,, IV = 1.98 V):}

Answer»

I
II
III
IV

Solution :more is the REDUCTION POTENTIAL , STRONGER will be the oxidising AGENT .
Discussion
21456.

The vapour pressure curves of the same solute in the same solvent are shown. The curves are parallel to each other and do not intersect. The concentrations of solutions are in order of :

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`IltIIltIII`
`I=II=III`
`IgtIIgtIII`
`IgtIIIgtII`

Solution :Elevation in BOILING POINT `PROP` concentration of a solution. Thus, the order of concentration of solutionis `I lt II lt III`.
Discussion
21457.

Whichof the following factorinfulence the basicityaliphaticaminesin aqueousmedium ? (1) Inductiveeffectof alkyl group (2) Solvationeffect (3)Stericeffect

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1,3
1,2
2,3
1,2,3

Answer :D
Discussion
21458.

Write the chemical formula of nitropentaamminecobalt (III) chloride.

Answer»

Solution :`[Co(NH_(3))_(5)(NO_(2))]Cl_(2)`
Discussion
21459.

when a gas expands from 1. 5L to 6.5 L againt a constant pressure of 0.50 atm and during process , the gas also absorbs 100 J of heat. The change in internal energy is

Answer»

153.3 J
353.3 J
`-153 . 3 J`
`-353 . 3 J`

SOLUTION :`(-W)=P_(ext)DeltaV=0.5(6.5 -1.5)`
`=2.5 L- atm=2.5xx101.3J = 253.25J`
`DeltaU+q+W=100-253.25=-153.25J`
Discussion
21460.

What volume of methane (NTP) is formed from 8.2 g of sodium acetate by fusion with soda lime:

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10 litre
11.2 litre
5.6 litre
2.24 litre

Answer :D
Discussion
21461.

Which of the following do(es) not represent DeltaH formation of the product.

Answer»

`1/2 H_(2)(g)+1/2 Br_(2)(g)rarr HBr`<BR>`H_(2)(g)+Cl_(2)(g) rarr 2HCl`
`NH_(4)^(+)(g)+Cl^(-) (g) rarr NH_(4)Cl(s)`
`P_(4)("black")+5O_(2)(g) rarr P_(4)O_(10)(s)`

Solution :`A=Br_(2)` must be present in liquid STATE
`B=` Only FORMATION of one mole compound
`C=` Only elementry susbstances should present in the reactant SIDE.
`D=P_(4)` (white) is used
Discussion
21462.

The specific conductivity of N/10 KCl solution at 20^@ is 0.212 ohm^(-1) cm^(-1) and the resistance of the cell containing this solution of 20^@C is 55 ohm. The cell constant is

Answer»

`4.616 CM^(-1)`
`11.66 cm^(-1)`
`2.173 cm^(-1)`
`3.324 cm^(-1)`

Solution :`K=(1)/(R) xx ` cell constantor cell CONSTANT`= K xx R =0 xx 0.212 xx 55 =11.66 cm^(-1)`
Discussion
21463.

Which of the following pairs of atoms have the most similar atomic radii ?

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CR, MO
NI, Pd
Mo, W
Ti, ZR

Answer :C
Discussion
21464.

Which of the following metal forms an amphoteric oxide

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Ca
Fe
Cu
Zn

Solution :`ZNO+2HClrarr ZnCl_(2)+H_(2)O`
`ZnO+2NaOHrarr Na_(2)ZnO_(2)+H_(2)O`
Discussion
21465.

Which of the following orders is correct for the bond dissociation enthalpy of halogen molecules ?

Answer»

`Br_(2) gt I_(2) gt F_(2) Cl_(2)`
`F_(2) gt Cl_(2) gt Br_(2) gt I_(2)`
`I_(2) gt Br_(2) gt Cl_(2) lt F_(2)`
`Cl_(2) Br_(2) gt F_(2) gt I_(2)`

Solution :`Cl_(2) gt Br_(2) gt F_(2) gt I_(2)`
Discussion
21466.

Which of the following statements regarding copper salts is not true?

Answer»

Copper (I) DISPROPORTIONATES into Cu and Cu (II) in AQUEOUS solution
Copper (I) can be stabilized by the formation of insoluble complex compounds such as `CuCl_(2)^(-) and Cu(CN)_(2)^(-)`
Copper (II) oxide is red powder
Hydrated `CuSO_(4)` is `[Cu(H_(2)O)_(4)]SO_(4).H_(2)O`

Answer :C
Discussion
21467.

Which of the following functional derivatives of carboxylic acid is least soluble in water ?

Answer»

ACYL chloride
Ester
Amide
Anhydride.

Answer :C
Discussion
21468.

When t-butyl methyl ether is reacted with cold conc. HI to gives t-butyl iodine and methyl alcohol. The reaction proceeding through

Answer»

`SN^1`
`SN^2`
`E^1`
`E^2`

ANSWER :A
Discussion
21469.

What is meant by positive and negative adsorptions?

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Solution :Positive adsorption is the phenomenon INVOLVING higher concentration of ADSORBATE on the surface of adsorbent than to concentration of adsorbate in the bulk PHASE. On the other HAND, negative adsorption is the phenomenon involving LESSER concentration of adsorbate on the surface of adsorbent as compared to the concentration of adsorbate in the bulk of adsorbent.
Discussion
21470.

To weld metals together, high temperature is required. Such a high temperature is obtained by burning :

Answer»

ACETYLENE in oxygen
LPG in oxygen
Methane in oxygen
Acetylene in nitrogen

Solution : Oxy-fuelwelding(COMMONLY called OXYACETYLENE weldingoxywelding or GASWELDING ) andoxy-fuel cuttingare processesthat usefuelgasesandoxygento weldand cutmetals
Discussion
21471.

When hydrated MgCl_(2), 6H_(2)O is heated in stream of HCl gas, what is the end product?

Answer»

SOLUTION :`MgCl_(2)+6H_(2)O`
Discussion
21472.

Upon heating a litre of a N/2HCl solution , 2.675 g of hydrogen chloride is lost and the volume of the solution shrinks to 750 mL .Calculate (i) the normality of the resultant solution (ii) the number of milliequivalents of HCl in 100 mL of the original solution .

Answer»

SOLUTION :`0.569 N ,50`
Discussion
21473.

Which of the following statements concerning ionic compounds is false ?

Answer»

They CONSIST of IONS
They have generally high melting and boiling POINTS
They conduct ELECTRICITY in the solid STATE
They are generally soluble in polar solvents.

Answer :C
Discussion
21474.

Which one of the following is named as sorbital ?

Answer»

`{:(CH_2OH),(|),(CHOH),(|),(CH_2OH):}`
`CH_3 - (CH_2)_3 - CH_2OH`
`C_6H_5OH`
`HO-CH_2-(CHOH)_4-CH_2OH`

SOLUTION :`HO-CH_2-(CHOH)_4-CH_2OH`
Discussion
21475.

When potential of any half cell is measured with respect to hydrogen electrode, then potential of such galvanic cell is known as . . . .

Answer»

Potential of CONCENTRATION CELL
emf of any cell (ELECTROMOTIVE force)
Zero potential
Steady potential

Solution :emf of any cell (Electromotive force)
Discussion
21476.

When a mixture of calcium acetate and calcium formate is dry distilled, the product formed is

Answer»

actaldehyde
ACETONE
ACETIC ACID
FORMALDEHYDE

ANSWER :A
Discussion
21477.

Which of the following gives precipitate of AgCl readily with alcohlic AgNO_(3)?

Answer»

`C_(6)H_(5)Cl`
`CHCl=CHCl`
`CH_(3)CH_(2)CH_(2)Cl`
`CH_(2)=CHCH_(2)Cl`

Answer :D
Discussion
21478.

Which of the following is/ are halogen exchange reaction (s) 1 Finkelstein reaction"" 2 swarts reaction 3 Wurtz reaction "" Hoffman's reaction

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1,3
1,2
3,4
1,2,4

Answer :B
Discussion
21479.

Which one of the following statements is incorrect regarding amylopection

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It is a LINEAR POLYSACCHARIDE 
It does not react with `I_(2)` solution 
It is the constituent of starch 
1,4-and 1,6-glycosidic linkages are present

Answer :A
Discussion
21480.

The unit of specific conductivity is

Answer»

OHMS `CM^(-1)`
ohms `cm^(-2)`
`OHM^(-1)` cm
`ohm^(-1)cm^(-1)`
Discussion
21481.

The X-ray of wavelength 1.5A^@ are incident on a crystal having an interatomic distance of 1.6A^@. Find out the angles at which the first and second order reflection take place.

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SOLUTION :`27^@57. , 69^@38.`
Discussion
21482.

What is solubility product? Explain its importance in qualitative analysis.

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Solution :The IONIC PRODUCT in a saturated solution of an ELECTROLYTE at a given temperature is ALWAYS a constant quantity and is termed as solubility product. Whenever in a solution the ionic product exceeds the solubility product, the PRECIPITATION occurs due to the supersaturation of solution.
Discussion
21483.

Which of the following attacks glass

Answer»

HCl
HF
HI
HBr

Solution :Glass being a mixture of sodium and calcium SILICATES reacts with hydrofluorec acid forming sadium and calcium fluorosilicates respectively.
`Na_(2)SiO_(3)+HF to Na_(2)SiF_(6)+3H_(2)O`
`CaSiO_(3)+6HF+CaSiF_(6)+3H_(2)O`
The ETCHING of glass is based on these reactions.
Discussion
21484.

Which of the following relation is correct for degree of hydrolysis of ammonium acetate?

Answer»

`h=sqrt(K_b/C)`
`h=sqrt(K_a/K_b)`
`h=sqrt(K_h/(K_a.K_b))`
`h=sqrt((K_a.K_b)/K_h)`

SOLUTION :`h=sqrt(K_h/(K_a.K_b))`
Discussion
21485.

Which of the following does not show negative deviation from Raoult's law

Answer»

ACETONE - CHLOROFORM
Acetone - Benzene
Chloroform - ETHER
Chloroform - Benzene

Answer :B
Discussion
21486.

Which of them is not present in RNA ?

Answer»
Discussion
21487.

The relative lowering of vapour pressure is equal to the mole fraction of the non-volatile solute. This statement was given by:

Answer»

Raoult
Henry
Joule
Dalton

Answer :A
Discussion
21488.

Which of the following is physical adsorption?

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ADSORPTION of `H_(2)` on nickel
Friedel CRAFTS REACTION
Synthesis of `SO_(3)`, in the presence of NO
Corrosion of iron

Solution :Adsorption of `H_(2)` on nickel
Discussion
21489.

Which of the following has lower stretching frequency for C-O bond ?

Answer»

`[MN(CO)_(6)]^(+)`
`[V(CO)_(6)]^(-)`
Both have equal stretching frequency
None of these

Solution : EXTENT of synergic bonding
= `[V(CO)_(6)]^(-) GT [Mn(CO)_(6)]^(+)`
C-O BOND order
= `[Mn(CO)_(6)]^(+) gt [V(CO)_(6)]^(-)`
C-O bond stretching frequency
=`[Mn(CO)_(6)]^(+)gt[V(CO)_(6)]^(-)`
Discussion
21490.

underset("hv") overset(Cl_(2))to Products Find out no of correct statements about above reaction. (A) No of monochlorinated products are three (B) No of optically active monochlorinated products are two (C) No of optically inactive monochlorinated product is one (D) No of dichlorinated products are ten (E) No of optically active dichlorinated product are six (F) No of optically inactive dichlorinated products are 4 (G) No of meso dichlorinated products are two (H) No of dichlorinated products are six (I) No of optically active dichlorinated products are seven (J) No of meso dichlorinated products is one

Answer»


SOLUTION :Monochlorination

DICHLORINATION

`A,B,C,D,E,F,J` are correct
Discussion
21491.

When the vapour pressure of solutions of two liquids are less than those expected from idea solutions, they are said to show:

Answer»

POSITIVE DEVIATION from idea BEHAVIOUR
Negative deviation from idea behaviour
Positive deviations for lower concentrations and negative deviations for HIGHER concentration
None

Answer :B
Discussion
21492.

The standard reduction potentials of Cu^(2+)//Cu and Cu^(2+)//Cu^(+) and 0.337 and 0.153 V respectively. The standard electrons potential of Cu^(+)//Cu half cell is

Answer»

0.184 V
0.827 V
0.521 V
0.490 V

ANSWER :C
Discussion
21493.

Which represents a concentration cell:

Answer»

`PtH_2|HCI||HCI|PtH_2`


`Fe|Fe^(2+)||CU^(2+)|Cu`

ANSWER :A
Discussion
21494.

Which statement is not correct

Answer»

AMINES form hydrogen bond
Ethyl amine has higher boiling point than PROPANE
Methyl amine is more basic than ammonia
Dimethyl amine is less basic than methyl amine.

Solution :
In methyl amine only ONE electron RELEASING group is present but in dimethyl amine two electron releasing groups are present which increase the basicity higher is diethyl amine.
Discussion
21495.

(x)+K_2CO_3+Airoverset("heat")rarr(Y) (Y)+Cl_2rarr(Z)Pink Which of the following is correct ?

Answer»

`X = "BLACK" , Mn O_2 , Y = "BLUE" ,K_2CrO_4,Z=KMnO_4`
`X = "GREEN" ,Cr_2 O_3, Y = "Yellow" ,K_2CrO_4,Z=K_2Cr_2O_7`
`X = "black" , MnO_2 Y = "green" ,K_2CrO_4,Z=K_2MnO_4,Z=KMnO_4`
`X=" black" , Bi_2O_3,Y = " COLOURLESS " KBiO_2,Z=KBiO_3`

ANSWER :C
Discussion
21496.

The total number of reactant spices involved in an elementary step is called is .............

Answer»

SOLUTION :MOLECULARITY
Discussion
21497.

Which of the following are examples of aldol condensation?

Answer»

`2CH_(3)CHO overset(DIL. NAOH)to CH_(3)CHOHCH_(2)CHO`
`2CH_(3)COCH_(3) overset(dil. NaOH)to CH_(3)C(OH)(CH_(3))CH_(2)COCH_(3)`
`2HCHO overset(dil. NaOH)to CH_(3)OH+HCOOH`
`C_(6)H_(5)CHO+HCHO overset(dil. NaOH)to C_(6)H_(5)CH_(2)OH`

Solution :`2CH_(3)CHO overset(dil. NaOH)to CH_(3)CHOHCH_(2)CHO` and`C_(6)H_(5)CHO+HCHO overset(dil. NaOH)to C_(6)H_(5)CH_(2)OH`
Discussion
21498.

Which of the following mineral of iron has the highest sulphur content ?

Answer»

Siderite
Magnetite
Iron pyrites
Limonite

Answer :C
Discussion
21499.

Which is the SI unit of conductance?

Answer»

`"SIEMEN"^(-1) (or) S^(-1)`
Siemen(or)S
`SM^(-1)`
`S^(-1) m^(-1)`

ANSWER :B
Discussion
21500.

The velocity of electron in the third Bohr orbit of hydrogen is v. The velocity of the electron in the first orbit would be:

Answer»

9v
3V
v/3
v/9

Solution :`v_(N)=(2.19xx10^(6)Z)/n ms^(-1)`
`v_(n)PROP 1/n` for H ATOM
`(v_(3))/(v_(1))=1/3`if `v_(3)=v`, then `v_(1)=3v`
Discussion