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7801.

The thickness of Milky way Galaxy is 40 Em. It can be expressed in metres as

Answer»

`4.0 xx 10^19 m`
`4.0 xx 10^15 m`
`4.0 xx 10^18 m`
`4.0 xx 10^12 m`

SOLUTION :`1Em = 10^18 m`
UNIT FACTOR , 1` = (10^18m)/(1Em)`
` 40Em = 40 Em xx ( (10^18m)/(1Em) ) `
`= 40 xx 10^18 m " or" 4.0 xx 10^19 m`
Discussion
7802.

The relationship between osmmotic pressure at 273 k when 10 gglucose (P_(1)), 10 g urea (P_(2)) and 10g sucorse P_(3)) are dissoved in 250 ml of water is

Answer»

`P_(1) gt P_(2) gt P_(3)`
`P_(3) gt P_(1) gt P_(2)`
`P_(2) gt P_(1) gt P_(3)`
`P_(2)gt P_(3)gt P_(1)`

Answer :C
Discussion
7803.

Which of the following arrangements shows the schematic alignment of magnetic moments of ferromagnetic substance ?

Answer»




ANSWER :B
Discussion
7804.

Write the decreasing order of acidic strengths of the following: A : Phenol, B:p-nitrophenol, C: p-chlorophenol, D: p-cresol and E: p-methoxy phenol.

Answer»

Solution :Most ACIDIC in the given list of PHENOLS is p-nitrophenol. Least acidic in the given list of phenols is p-methoxy phenol. The order of acidic strength is : B > C > A > D > E.
Discussion
7805.

Which of the following is not a best representation of the H-bond?

Answer»




None

Solution :`NH_(3)` is stronger lewis base than `H_(2)O and H_(2)O` has more ACIDIC H-atom than `NH_(3)`
Discussion
7806.

When 0.1M CH_(3)COOH solution is shaken with activated charcoal and the charcoal is filtered out, the concentration of acid -

Answer»

Increases
Decreases
Remains unchanged
Can't say

Answer :B
Discussion
7807.

Write reactions and conditions for the following conversions : (i) Ethanol to Propanone (ii) Benzoyl chloride to Benzaldehyde (iii) Acetaldehyde to Crotonaldehyde.

Answer»

Solution :Steps involved in the conversions are given below : (i) `underset("Ethanol")(CH_(3)CH_(2)OH) overset(Cu)underset(573 K) to CH_(3) -underset("Ethanol")overset(O)overset(||)C-Hoverset((i)CH_(3)MgBr)underset((ii)H_(2)O//H^(+)) to underset("Propan-2-ol")(CH_(3)-overset(OH)overset(|)CH-CH_(3) - overset(K_(2)Cr_(2)O_(7))underset(H_(2)SO_(4)"CONC")to CH_(3) -underset("Propanone")(CH_(3)-overset(O)overset(||)C-CH_(3)`
(ii) `underset("BENZOYL chloride")(C_(6)H_(5))-overset(O)overset(||)C-Cl + H_(2) overset(Pd-BaSO_(4))to underset("Benzaldehyde")(C_(6)H_(5)-overset(O)overset(||)C-H + HCl`
(iii) `2CH_(3) underset("Ethanol")overset(O)overset(||)C-H overset("dil NAOH")to CH_(3) - underset("3-Hydroxybutanol")overset(OH)overset(|)CH-CH_(2)-overset(O)overset(||)C-H overset("heat")to CH_(3)-CH= underset("Crotonaldehyde")(CH - overset(O)overset(||)C-H)`
Discussion
7808.

Which of the following properties does not correspond to the order? HI lt HBr lt HCl lt HF

Answer»

REDUCING power
Thermal stability
Dipole moment
Ionic character.

Answer :D
Discussion
7809.

Which does not give oxygen on heating?

Answer»

`K_2Cr_2O_7`
`ZN(ClO_3)_2`
`KClO_3`
`(NH_4)_2Cr_2O_7`

ANSWER :D
Discussion
7810.

The two functional groups present in a typical carbohydrates are:

Answer»

`-OH and -COOH`
`-CHO and -COOH`
`gt C =O and -OH`
`-CHO and -COCL`

ANSWER :C
Discussion
7811.

Whichof the following amine doesnot givealcohols with HNO_(2)?

Answer»

`C_(2)H_(5)NH`
`CH_(3)CHNH_(2)CH_(3)`
`CH_(3)NHCH_(3)`
`(CH_(3))_(3)CNH_(2)`

Solution :Secondary aminedoes notgive ALCOHOL withnitrous ACID.
Discussion
7812.

What is molar conductivity? How is it related to the conductivity of a solution whose concentration is C mol m^-3?

Answer»

SOLUTION :The CONDUCTANCE due to all the ions in a solution containing one mole of the electrolyte.
The relation between the conductivity of a solution WHOSE concentration is `"Cinolm"^(-3)` is `E_(m)=(k )/(C )`
Discussion
7813.

What is formed by the evaporation of the aqueous solution of formaldehyde ?

Answer»

SOLUTION :PARAFORMALDEHYDE
Discussion
7814.

Which is the correct alternate for hydrolysis constant of NH_(4)CN

Answer»

`sqrt((K_(W))/(K_(a)))`
`(K_(w))/(K_(a) xx K_(B))`
`sqrt((K_(b))/(c))`
`(K_(a))/(K_(b))`

SOLUTION :`NH_(4)CN` is a salt of weak ACID and weak BASE.
Discussion
7815.

ZnXoverset("dil."H_(2)SO_(4))(rarr)underset("Colourless gas")(A)+BA overset(K_(2)Cr_(2)O_(7))(rarr)Y (Yellow turnbidity) + Green Solution. Then X is

Answer»

`NO_(2)^(-)`
`S_(2)O_(3)^(2-)`
`SO_(3)^(2-)`
`S^(2-)`

Solution :`ZnSoverset("DIL" H_(2)SO_(4))(rarr)underset((B))(ZnSO_(4))+`
`underset((A))(H_(2)S)OVERSET(K_(2)Cr_(2)O_(7))(rarr)Sdarr+Cr^(3+)`
Discussion
7816.

Which of the following reacts rapidly with oxygen in the air at ordinary temperature?

Answer»

<P>WHITE P
RED P
`N_2`
`N_2O`

ANSWER :A
Discussion
7817.

What type of drug is phenacetin?

Answer»

SOLUTION :ANTIPYRETIC.
Discussion
7818.

Which of the following cation gives white precipitate with H_2S in alkaline medium ?

Answer»

`MG^(2+) `
`Cu^(2+) `
`CD^(2+) `
`ZN^(2+)`.

ANSWER :D
Discussion
7819.

Which one of the following is formed when phenol is treated with acidifiedK_2Cr_2O_7 ?

Answer»

Benzoic acid
PHENYL amine
Phenyl ACETATE
1,4 - BENZO QUINONE

SOLUTION :1,4 - benzo quinone
Discussion
7820.

underset(("Lewis base"))(B_(2)H_(6)+2Lrarr2BH_(3)L) L would be :

Answer»

`NH_(3)`
`CH_(3)NH_(2)`
`(CH_(3))_(2)NH`
`(CH_(3))_(3)N`

SOLUTION :`N//A`
Discussion
7821.

What is the advantage of using osmotic pressure as com-ared to other colligative properties in determining molar mass of a solute ?

Answer»

SOLUTION :For ANSWER, CONSULT SECTION 12.
Discussion
7822.

Which one of the following is a secondary amine?

Answer»

2-Butanamine
N-Methyl-2-pentanamine
p-Anilisine
N-Methyl PIPERIDINE

ANSWER :B
Discussion
7823.

Volume occupied by one molecule of water (density = 1 g cm^-3 ) is :

Answer»

`9.0 XX 10^(-23) cm^3`
`6.023 xx 10^(-23) cm^3`
`3.0 xx 10^(-23) cm^3`
`5.5 xx 10^(-23) cm^3`

SOLUTION :`3.0 xx 10^(-23) cm^3`
Discussion
7824.

Which of the following is blue solid?

Answer»

`NO`
`N_(2)O_(3)`
`N_(2)O_(4)`
`N_(2)O_(5)`.

Answer :B
Discussion
7825.

Which is the simplest element?

Answer»

SOLUTION :HYDROGEN
Discussion
7826.

Which reaction confirms the presence of gt C=Ogroup in glucose ?

Answer»

FORMATION of OXIME with hydroxyl amine
OXIDATION of GLUCOSE to gluconic acid.
Reduction of TOLLEN's reagent.
Oxidation of glucose to saccharic acid.

Solution :Formation of oxime with hydroxyl amine
Discussion
7827.

Zr and Hf are having similar chemical properties. This is due to_____.

Answer»

SOLUTION :LANTHANOID CONTRACTION
Discussion
7828.

Write structures of the compound whose IUPAC names are as follows : Cyclohexylmethanol

Answer»

SOLUTION :
Discussion
7829.

Which of the following drugs is a tranquilizer?

Answer»

Iodoform
Cimetidine
Equanil
Pencillin

Answer :C
Discussion
7830.

Which of the following exists as dimer in benzene ?

Answer»

`CH_3 CHO`
`CH_3 COCH_3`
`CH_3 CH_2 OH`
`CH_3COOH`

ANSWER :D
Discussion
7831.

Which is the most abundant noble gas ?

Answer»

SOLUTION :ARGON is the most ABUNDANT NOBLE GAS
Discussion
7832.

Which one of the following is not an example of biodegradable plastic?

Answer»

POLYHYDROXY butyrate
poly glycollic ACID
POLYTHENE
poly caprolactone

SOLUTION :polythene
Discussion
7833.

Which metal makes steel suitable for cutting purposes by maintaining the cutting edge of the blades?

Answer»

MnO
Al
W
C

Answer :C
Discussion
7834.

What happens when SO_2 is passed through an aqueous solution of Fe (III) salt?

Answer»

SOLUTION :`S_2` REDUCES AQUEOUS solution of Fe (III) salt to Fe (II) salt .`2Fe^(3+)+SO_2+2H_2Oto2Fe^(2+)+SO_4^(2-)+4H^+`
Discussion
7835.

Total number of isomers for C_(4)H_(6)Br_(2) containing cyclobutane ring are (including stereoisomer) ?

Answer»


SOLUTION :
Discussion
7836.

Which one of the following is NOT correct for monosaccharides? 1. They are optically active polyhydroxy carbonyl compounds 2.Fructose is ketose sugar and hence it does not give red precipitate with Fehling solution 3. alpha - D(+) glucose and beta - D(+) glucose are anomers 4. Glucose and mannose are anomers

Answer»

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

Answer :C
Discussion
7837.

Which of the followingrepresents Freen?

Answer»

ACETYLENE tetrachloride
Trichlorethylene
Dichlordifluoromethane
Ethylene dichloride

Solution :Chlorofuoro carbons are CALLED Freon. `C Cl_(2)F_(2)`
Discussion
7838.

The van't Hoff factor i of a compound which undergoes dissociation in one solvent and association in other solvent is respectively

Answer»

LESS than ONE and GREATER than one
less than one and less than one
greater than one and less than one
greater than one and greater than one

Solution :For DISSOCIATION, `igt1`
For ASSOCIATION, `ilt1`
Discussion
7839.

Which of the following compound gives paramagnetic gas on heating :-

Answer»

`LiNO_(3)`
`NaNO_(3)`
`KNO_(3)`
All of these

ANSWER :D
Discussion
7840.

Which of the following carbocation is maximum stable ?

Answer»

`CH_(3)-OVERSET(CH_(3))overset("|")UNDERSET(CH_(3))underset("|")("C"^(o+))`


`H_(2)C CH-overset(o+)(C )H_(2)`

Solution : is AROMATIC with `6pi e^(-)`
Discussion
7841.

Write the chemical reaction involed in the preparation of sulphur sol.

Answer»

Solution :`SO_(2)+2H_(2)S overset("OXIDATION")rarr3S_("SOL")+2H_(2)O`
Discussion
7842.

Which of the following elements can not form compounds?

Answer»

Helium
Xenon
FLUROINE
HYDROGEN

ANSWER :A
Discussion
7843.

The solution which shows negative or positive deviation by Raoult's law, is called

Answer»

IDEAL SOLUTION
Real solution
Non-ideal solution
COLLOIDAL solution

Answer :C
Discussion
7844.

Which of the following reagent reacts with but-1-ene to give optically inactive product ?

Answer»

`Br_(2)//CCI_(4)`
`HBr`
`H_(2)O//H^(+)`
`(BH_(3))_(2)//H_(2)O_(2)(OH)^(-)`

SOLUTION :`(BH_(3))_(2)//H_(2)O_(2)(OH)^(-)`
Discussion
7845.

Which one of the following acid is the weakest? (MP PMT 1985)

Answer»

`HClO`
HBr
`HClO_(3)`
HCl

Solution :`underset("Weakacid")(HClO) Leftrightarrow H^(+) +underset("Strong CONJUGATE BASE")(CLO^(-))`
Discussion
7846.

When 3.2 g S is vaporized at 450^(@)C and 723 mm pressure, the vapours occupy a volume of 780 mL What is the molecular formula of S vapours ?

Answer»

SOLUTION :GIVEN, P =2 atm, T=270=273=543 K
`w_(CO_(2))=2xx1.53g,m_(CO_(2))=44`
`because PV=(w//m)RT`
`2xxV=[(2xx1.53)//44]xx0.0821xx543`
`THEREFORE V=1.55` litre
Discussion
7847.

Which of the following is/are not method(s) for refining of metals ?

Answer»

POLING
Cupellation
Goldschmidit ALUMINOTHERMIC process
Smelting

Solution :Both these METHODS cannot be USED.
Discussion
7848.

Whichhas maximum boiling point ?

Answer»

`CH_(2)OH`<BR>`CH_(3)CH_(2)I`
`CH_(3)CH_(2)CL`
`CH_(3)CH_(2)Br`

ANSWER :B
Discussion
7849.

Which of the following reactions is Kolbe's reaction ?

Answer»




ANSWER :A
Discussion
7850.

Which is decreasing order of coagulating power for positive charged sol ?

Answer»

`Cl^(-)gtSO_(4)^(2-)gtPO_(4)^(-3)`
`PO_(4)^(-3)gtSO_(4)^(-2)GT Cl^(-)`
`SO_(4)^(-2)gtPO_(4)^(-3)gtCl^(-)`
`Cl^(-)gtPO_(4)^(-3)gtSO_(4)^(-2)`

Solution :`PO_(4)^(-3)gtSO_(4)^(-2)gt Cl^(-)`
Discussion