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2501.

The violent reaction between sodium and water is an example of :

Answer»

Reduction
Oxidation
Rodox reaction
Neutralisation reaction

Answer :C
Discussion
2502.

Which of following is maltose.

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ANSWER :D
Discussion
2503.

When 9.0ml of arsenius sulphide sol and 1.0ml of 1.0xx10^(-4)M BaCl_(2) are mixed turbidity due to precipitation just appears after 2 hours. The effective ion and its coagulating value are respectively.

Answer»

`Cl^(-),10"m MOL"//L`
`Cl^(-),20"m mol"//L`
`Ba^(2+),10"m mol"//L`
`Ba^(2+),20"m mol"//L`

Solution :CONC. Of `Ba^(2+)=(10^(-4))/(10xx10^(-3))M=10^(-2)M=10"m MOLE"//L`
Discussion
2504.

Which one of the follwing gives the highest amount of hydrogen ions (H^(+))?

Answer»

sodium hydroxide SOLUTION
MILK of magnesia
lemon juiice
gastric juice

Solution :Gastric juice gives the HIGHEST amount of the hydrogen IONS gastric juice is responsible for BREAKING down foods you eat so digestion can continue in the small intestine
Discussion
2505.

Which one of the following is used to identify chloride ion in inorganic qualitative analysis?

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BARIUM CHLORIDE TEST
CHROMYL chloride test
Brown RING test
Ammonium molybdate test

Solution :Chromyl chloride test
Discussion
2506.

Which contains the same number of molecules as 16 g of oxygen :

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`16 G O_3`
`32 g SO_2`
`32 gSO_3`
All of the above

Answer :C
Discussion
2507.

To an evacuated vessel with movable piston under external pressure ofof He andof an unknown compound (vapour pressure 0.68 atm at 0^(@)C) are introduced. Considering the ideal behaviour, the volume (in litre) of the gases at 0^(@)C is close to:

Answer»


Solution :Since, the external PRESSURE is 1.0 atm, the gas pressure is also 1.0 atm as piston is movable. Out of this 1.0 atm partial pressure DUE to unknown compound is 0.68 atm.
THEREFORE, partial pressure of He `= 1.00 - 0.68 = 0.32` atm
`rArr` Volume =`= (n(He)RT)/(p(He)) = (0.1 xx 0.082 xx 273)/(0.32) = 7L rArr` Volume of container = volume of He.
Discussion
2508.

Which of the following alkali metal reacts with water least vigorously ?

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Sodium
Potassium
Lithium
Cesium

Answer :C
Discussion
2509.

Two moles of ethanal in the presence of dil. NaOH gives 3-hydroxybutanal. What is this reaction known as ?

Answer»

SOLUTION :ALDOL REACTION
Discussion
2510.

Which of the following do not determine the electrical conductance ?

Answer»

STRUCTURE of metal
Number of VALENCE ELECTRONS PER atom
Temperature
Pressure

Answer :D
Discussion
2511.

Which of the following is benzyl amine ?

Answer»




ANSWER :A
Discussion
2512.

What is the shape of ClF_(3),BrF_(5),IF_(7) molecules.

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SOLUTION :`ClF_(5)rarrT."Shaped,"BrF_(5)RARR"Square pyramidal"`
`IF_(7)rarr` PENTAGONAL bipyramidal.
Discussion
2513.

Write reactions of the alkylation product of aniline with excess of methyl iodide in presence of sodium carbonate solution.

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SOLUTION :
Discussion
2514.

When a metal rod 'M' is dipped into an aqueous colourless concentrated aqueous solution of compound 'N' , the solutions becomes light blue . Addition of aqueous NaCl to the blue solution gives a white precipitate 'O' and gives an intense blue solution . 8. The metal rod M is :

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Fe
Cu
Ni
Co

SOLUTION :The avaialable INFORMATION SUGGEST that METAL rod 'M' is of copper.
Discussion
2515.

Which moieties of nucleosides are involved in the formation of phosphodiester linkages present in dinnucleotides? What does the word diester in the name of linkage indicate ? Which acid is involved in the following of this linkage ?

Answer»

Solution :In the formation of dinucleotides, the 3' `-OH` group of one nucleotide UNIT `5'-OH` group of the other nueleotide molecule are involved to form the phosphodiester linkage.The ACID involved in this linkage is phosphoric acid and the word diester in this linkage indications that TWO `OH` groups of phosphoric acid are involved in the formation of ESTER linkages.
Discussion
2516.

Which among the following dissolves in NaOH?

Answer»

`CH_3NO_2`
`(CH_3)_3CNO_2`
`C_6H_5NO_2`
`C_6H_5ONO`

ANSWER :A
Discussion
2517.

Whichof thefollowingis notpreparedby Kolbe's electrolyticprocess?

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`C_(3) H_(8) `
`C_(2) H_(6)`
`c_(4)H_(10)`
`C_(6)H_(14)`

ANSWER :A
Discussion
2518.

Which one of the following reaction of Xenon compounds is not feasible?

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`XeF_6 + H_2O RARR XeO_4 + HF`

ANSWER :A
Discussion
2519.

Which of the following is obtained when an oil is hydrolysed with alkali

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Fat
Wax
Soap
Vitamin

Solution :Oil +NaOH (ALKALI ) `overset("Saponification")to` GLYCEROL +Soap
Discussion
2520.

Which of the following is natural sweetner ?

Answer»

Aspirin
Serotonin
Benzene
Sucrose

Answer :D
Discussion
2521.

Which of the following is/are correctly matcbed?

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Cyanide PROCESS - extraction of Au
Froth FLOATING process - `CuSO_(4)`
Electrolytic REDUCTION - extraction of Cu
Zone refining - ultrapure Ge

Solution :Au extracted by eynide process.
Cu - extracted by SELF reduction. Not by electrolytic reduction Zone refining is used for the PRODUCTION of ultra pure semiconductors like Ge.
`CuSO_(4)` is used as activator in froth floatation process.
Discussion
2522.

Which of the following represent the correct order of acidic strength ? (i) HC-=CH gt H_(2)C =CH_(2) gt CH_(3) -CH_(3) (ii) HC-= CH gt CH_(3)-CH_(3) gt H_(2)C=CH_(2) (iii) CH_(3)C-= CH gt HC -= CH gt CH_(3)-C-=C-CH_(3) (iv) HC-= CH gt CH_(3)-C-=CH gt CH_(3)-C-=C-CH_(3)

Answer»

I and iii
ii and iv
I and iv
I and iv

Solution :Due to the maximum percentage of s CHARACTER (50%), the sp hybridised orbitals of carbon atoms in ethyne molecules have highest ELECTRONEGATIVITY, hence, these attract the shared electron pair of the C-H bond of ethyne to a greater EXTENT than that of the `sp^(2)` hybridised orbitals of carbon in ethene and the `sp^(3)` hybridised orbital of carbon in ethane. Thus in ethyne, HYDROGEN atoms can be liberated as PROTONS more easily as compared to ethene and ethane.
Discussion
2523.

Which metal exahibits more than one oxidation state:

Answer»

Na
Mg
Fe
Al

ANSWER :C
Discussion
2524.

Which of the following statements is/are true about H_(3)PO_(2) ?

Answer»

It is a TRIBASIC acid.
One mole of it is neutralized by `0.5` mol of `Ca(OH)_(2)`.
`NaH_(2)PO_(2)` is acidic salt.
It disproportionates to `H_(3)PO_(3)" and " PH_(3)` on heating.

Solution :N/A
Discussion
2525.

Which of the following compounds are optically active compounds? (i) Butan-1-ol (ii) Heptan-4-ol (iii) 2-Chlorobutane (iv) 3-Chloropentane (v) Pentan-2-ol (vi) 2-Bromo-2-methylbutane (vii) Penta-2,3-diene.

Answer»

SOLUTION :The following COMPOUNDS possess asymmetric CARBON atom and show optical ACTIVITY.
(iii)
Discussion
2526.

Which of the following pair(s) represent(s) the isoelectronic species ?

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`S^(2-)` & `Sc^(3+)`
`SO_(2)` & `NO_3^(-)`
`N_(2)` & `CN^(-)`
`NH_3` & `H_3O^+`

Solution :SPECIES having same NUMBER of ELECTRONS are CALLED isoelectronic specis.
Discussion
2527.

Which of the following compounds corresponds Van't Hoff factor 'i' to be equal to 2 dilute solution

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`K_(2)SO_(4)`
`NaHSO_(4)`
Sugar
`MgSO_(4)`

SOLUTION :`MgSO_(4)` DISSOCIATES to give 2 ions.
Discussion
2528.

Which vitamin is not found in plants?

Answer»

Vitamin `B_(12)`
Vitamin `B_(6)`
Vitamin `B_(2)`
Vitamin `B_(1)`

Solution :Vitamin `B_(12)`
Discussion
2529.

Which is amorphous solid - (A) "Rubber" ""(B) "Plastic" (C) "Glass" ""(D) All

Answer»

Solution :(D)
Amorphus solids neither have ordered arrangement (i.e. no definite SHAPE) nor have SHARP melting point like crystals, but when heated, they BECOME pliable until they assume the properties usually related to liquid. It is THEREFORE they are regarded as SUPER cooled liquids.
Discussion
2530.

Which type of property is the Brownian movement of colloidal sol?

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Electrical
Optical
Mechanical
Colligative.

ANSWER :C
Discussion
2531.

Which pair of species doesn.t exist ?

Answer»

`B_(2)`
`Be_(2)`
`Li_(2)`
`H_(2)^(+)`

ANSWER :B
Discussion
2532.

When an ideal binary solution is in equilibrium with its vapour, molar ratio of the two components in the solution and in the vapur phase is :

Answer»

same
different
may or may not be same DEPENDING upon volatile nature of the two components

Answer :C
Discussion
2533.

Which event in 1989 led to the unification of Germany ?

Answer»

SOLUTION :FALL of the BERLIN WALL
Discussion
2534.

Zn(OH)_2 is:

Answer»

Amphoteric
Monobasic
DIBASIC
None

Answer :A
Discussion
2535.

The silvermirror with Tollen's reagent is formed by

Answer»

ACETONE
ETHYL acetale
glucose
ethanal

Answer :C::D
Discussion
2536.

The sum of mole fractions of A,B and C in a solution containing 0.1 mole each of A,B and C is:

Answer»

0.1
0.3
1
1/3.

Solution :The SUM of MOLE FRACTIONS of all the COMPONENTS =1.
Discussion
2537.

When 32.25 g of ethyl chloride is subjected to dehydrohalogenation reaction, the yield of alkene formed is 50%. The mass of the product formed is (atomic mass of Cl = 35.5)

Answer»

14 gm
28 gm
`64.5` gm
7 gm

Solution :`CH_(2)H_(5)Cloverset(-HCl)rarrC_(2)H_(4)`
`{:(64.5""28),(32.25""14):}`
`64.5gm C_(2)H_(5)Cl` GIVES `28 gm` of `C_(2)H_(4)`
`32.25 gm C_(2)H_(5)Cl` gives `= (28 xx 32.25)/(64.5) = 14`
`= 14 gm`of `C_(2)H_(4)`
Obtained producted is `50%` so mass of obtained alkene
`=(14)/(2) = 7 gm`.
Discussion
2538.

When ethyl chloride is reacted with alcoholic KOH, ethylene is formed. This is an example of ......... reaction

Answer»

Addition
Substitution
ELIMINATION
REARRANGEMENT

ANSWER :C
Discussion
2539.

What is the melting point of icein Kelvin scale ?

Answer»

Solution :The melting POINT of ICE in Kelvin SCALE is 273 K .
Discussion
2540.

Which of the following does not reduce Tollen's reagent ?

Answer»

`CH_(3)CHO`
`HCOOH`
`C_(6)H_(5)NHOH`
`C_(6)H_(5)NH_(2)`

Solution :`C_(6)H_(5)NH_(2)`
Discussion
2541.

Which is the leaving group in the following reaction ? CH_3OH + CH_2N_2 overset(HBF_4)to

Answer»

`H_2O`
`N_2`
`OVERSET(o+)CH_3`
`H^+`

ANSWER :B
Discussion
2542.

Why are powdered substaces more effective adsorbent than their crystalline forms ?

Answer»

SOLUTION :Powdered substances have GREATER surface area as compared to their crystalline forms. Greater the surface area, greater is the ADSORPTION.
Discussion
2543.

The reagnet which may be used to distinguish cane sugar and glucose solutions is

Answer»

solution
BAEYER's reagent
Both 1 & 2
Fehling's solution

ANSWER :D
Discussion
2544.

Widespread deaths due to liquor poisoning occurs due to :

Answer»

Presence of lead COMPOUNDS in LIQUOR
Presence of METHYL ALCOHOL in liquor
Presence of ethyl alcohol in liquor
Presence of carbonic ACID in liquor

Answer :B
Discussion
2545.

Which one of the following has the highest dipole moment ?(i) CH_(2)Cl_(2)(ii) CHCl_(3)(iii) C Cl_(4)

Answer»

Solution :(i)
In `CH_(2)Cl_(2)`, the RESULTANT of two C - Cl bond moments are enhanced by resultant of two C - H bond moments.
(II)
In `CHCl_(3)`, the resultant of two C - Cl bond moments is opposed by the third C - Cl bond moment.
(iii) `C Cl_(4)` is symmetrical and bond moments are cancelled mutually.

Thus, ORDER of dipole moment is
`CH_(2)Cl_(2)GT CHCl_(3)gt C Cl_(4)` (non - polar).
Discussion
2546.

V_(1) mL of NaOH of normality X and V_(2) mL of Ba(OH)_(2) of mormality Y are mixed together. The mixture is completely neutralised by 100 mL of 0.1 N HCl. If V_(1)//V_(2)=1/4 and X/Y=4, what fraction of the acid is neutralised by Ba(OH)_(2)?

Answer»

0.5
0.25
0.33
0.67

Answer :A
Discussion
2547.

Which of the following compound on oxidative ozonolysis give malonic acid as only product ?

Answer»

`CH_2=CH-CH_2-CH=CH_2`
`CH_2=CH-CH=CH_2`

ANSWER :C
Discussion
2548.

Which of the following is not an example of 3-15 compound ?

Answer»

InSb
GaAs
CdSe
AlP

Answer :C
Discussion
2549.

The reducts obtained in the reaction:

Answer»

`Ph-CHO and CHCl_(3)`
`PHCHO and HCOO^(Theta)Na^(oplus)`
`Ph-CH_(2)OH and CHCl_(3)`
`PhCOO^(Theta)Na^(oplus),PhCH_(2)OH and HCOO^(Theta)Na^(oplus)`

ANSWER :D
Discussion
2550.

What are extrinsic semiconductors ?

Answer»

Solution : The conduction of electricity in semi-conductors when takes place by addition of suitable IMPURITIES, it is known as extrinsic semiconductor and this PROCESS of addition of impurities is known as "DOPING” and impurities added are called "dopants".
Doping can be done with an impurity which is electron rich or electron deficient as compared to the intrinsic semiconductor silicon & germanium. Such impurities introduce electronic defects in them as a RESULT two types of extrinsic semiconductors are obtained :
(i) n-type semi-conductors
(ii) p-type semi-conductors.
Discussion