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14951.

Which solution would exhibit abnormal osmotic pressure ?

Answer»

AQUEOUS SOLUTION of urea
Aqueous solution of COMMON salt
Aqueous solution of glucose
Aqueous solution of sucrose

Answer :B
Discussion
14952.

trianglen, the change in the number of mole for the reaction, C_12H_22O_11(s)+12O_2(g)rarr12CO_2(g)+11H_2O(l) at 25^@C is

Answer»

ZERO
`-1`
2
4

Answer :A
Discussion
14953.

Write the structural formula of the follovwing compounds. (i) Prop-2-en-1-ol (ii) Prop-3-en-1-0l

Answer»

SOLUTION :(i) Prop-2-en-1-ol: `CH_2 =CH -CH_2OH`
(II) Prop-3-en-1-ol: `CH_2 = CH - OVERSET(CH_3)overset(|)(CH)- OH`
Discussion
14954.

Which is the first synthetic element ?

Answer»

SOLUTION :TECHNETIUM
Discussion
14955.

Write formula for coordinate complex, sodium hexanitro-N-cobaltate.

Answer»

Solution :`Na_(3)[CO(NO_(2))_(6)]`
Sodium hexanitro-N-cobaltate(III)
Discussion
14956.

Which of the following elements show allotropy? 1.Carbon2.Sulphur 3. Phosphorus 4. Hydrogen

Answer»

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

Answer :D
Discussion
14957.

What reacts with aldehydes and ketones in presence of HCl to form corresponding phenyl hydrazones?

Answer»

SOLUTION :PHENYL HYDRAZINE
Discussion
14958.

Which of the following compounds will dissolve in alkali solution after its reaction with Hinsberg reagent?

Answer»

N - Methylethanamine
Diethylamine
N, N - DIMETHYL aniline
Isopropylamine

Solution :After `"REA"^(n)` it has HYDROGEN
Discussion
14959.

true/False Water is more acidic than a phenol

Answer»


ANSWER :F
Discussion
14960.

Which of the following is not used as inhalation ananesthetic ?

Answer»

Ethoxyethane
Anethole
Ethrane
Isoflurane

Solution :NA
Discussion
14961.

What is the energy difference between the n=2 and n=3 levels for the hydrogen atom?

Answer»

SOLUTION :`3.03xx10^(-12)ERG`
Discussion
14962.

What is the main cause for charge on a colloidal solution ?

Answer»

ELECTRONS
Electrolytes
Non-electrolytes
Compounds

Answer :B
Discussion
14963.

Write the IUPAC name of [CO(NH_(3))_(4)(NO_(2))_(2)]CI

Answer»

SOLUTION : Here, in this case the positive PART is the complex. So, it is named FIRST with ligands ialphabetical order FOLLOWED by metal (but not ending in -ate as the metal BELONG to the positive part of the complex). This is followed by the negative part. So, the name is Tetraamminedinitrocobalt(III) chloride
Discussion
14964.

When Co is heated with NaOH under pressure , we get :

Answer»

SODIUM BENZOATE
Sodium acetate
Sodium FORMATE
Sodium oxalate

Answer :C
Discussion
14965.

Which is formed when potassium is burnt in excess of air ?

Answer»

`K_2O`
KO
`KO_2`
`K_2O_2`

ANSWER :C
Discussion
14966.

What is actinoid contraction? Why actinoid contraction is greater than lanthanoid contraction?

Answer»

Solution :The gradual DECREASE in the SIZE of ATOMS of actinoids or `M^(3+)` ions across the ACTINOID SERIES is called actinoid contraction.
Discussion
14967.

When solid, insoluble Hgl_(2)(s) is added gradually to a solution of Kl, following equilibrium is established : 2Kl(aq) + Hgl_(2)(s) hArr K_(2)[Hgl_(4)](aq) Which of the following applies appropriately at the above equilibrium?

Answer»

FREEZING POINT increases and then BECOMES constant
Freezing point decreases and then becomes constant
Boiling point increases and then becomes constant
Vapour PRESSURE increases to a constant value

Answer :A::D
Discussion
14968.

Which of the following substances consists of only one element

Answer»

Marble
SAND
DIAMOND
Glass

Solution :Diamond is a CRYSTALLINE solid which contains only carbon-atom.
Discussion
14969.

Which of the following compounds exhibit aromatic character?

Answer»




SOLUTION :N/A
Discussion
14970.

Which one of the following noble gases is the least polarizable?

Answer»

Helium
Neon
Krypton
Radon

Answer :A
Discussion
14971.

What is the sweetness value of saccharin in comparison to sucrose ?

Answer»

160
550
600
2000

Solution :550
Discussion
14972.

What happens when blue vitriol is heated?

Answer»

SOLUTION :`CuSO_4cdot5H_2O underset(toair)overset(exposure)rarr CuSO_4cdot3H_2O + 2H_2O`
`CuSO_4cdot5H_2O overset(100^@)rarr CuSO_4cdotH_2O + 4H_@2O` `CuSO_4cdot5H_2O overset(225-250^@C) CuSO_4 + 5H_2O.
Discussion
14973.

The vacant space in bcc lattic unit cell is

Answer»

`48%`
`23%`
`32%`
`26%`

SOLUTION :`32%`
Discussion
14974.

Which of the following is used for sharply defined castings

Answer»

Soldermetal
WOOD's METAL
TYPE metal
Devarda's alloy

Solution : Type metal
Discussion
14975.

The small pieces of DNA which are synthe- sised discontinuously are joined together by an enzyme called

Answer»

DNA ligase
DNA polymerase
RNA polymerase
Exonuclease

Answer :A
Discussion
14976.

Whichof the following statement is incorrect regarding lanthanides and actinides?

Answer»

OXIDATION state +3 is most common in both the series
In both series f-orbitals are progressively filled
The ELEMENTS of there series are radioactive
Both series SHOW contraction effect

Answer :C
Discussion
14977.

Which of the following is a 3_(@) amine?

Answer»

1 - methylcyclohexylamine
Triethylamine
tert - butylamine
N - methylaniline.

Solution :
OPTION (B) is CORRECT.
Discussion
14978.

Which is not present in Grignard reagent ?

Answer»

Methyl GROUP
Magnesium
HALOGEN
`=-COOH group`

ANSWER :4
Discussion
14979.

Whichamino acid has no asymmetic carbon atom ?

Answer»

HISTIDINE
GLYCINE
`ALPHA`-Alanine
Threonin

Answer :B
Discussion
14980.

Vitamin-Dis

Answer»

Tocopherols
ergosterol
tocopherols
calciferol

Answer :D
Discussion
14981.

Write the electronic configuration of Cr atom [Z=24].

Answer»

SOLUTION :`[AR]^(18) 3d^5 4s^1`
Discussion
14982.

The vapour pressure of 2.1% of an aqueous solution of a non-electrolyte at 373 K is 755 mm. Calculate the molar mass of solute.

Answer»

SOLUTION :`"58.7 G MOL"^(-1)`
Discussion
14983.

Which statement about molecularity of a reaction is wrong?

Answer»

it is number of MOLECULES ofthe REACTANTS taking part in a single step of reaction
it SI CALCULATED from the reaction mechanism
it may be either whole number or FRACTIONAL
none

Solution :Molecularity can never be fractional.
Discussion
14984.

Which of the following can be used for the synthesis of benzyl acetate ?

Answer»

`Ph-CH_(2)-OH+(CH_(3)CO)_(2)Orarr`
`C_(6)H_(5)-CH_(2)OH+CH_(3)-overset(O)overset("||")C-OHoverset(H^(oplus))RARR`
`C_(6)H_(5)CH_(2)OH+CH_(3)-overset(O)overset("||")C-Cloverset(Base)rarr`
`C_(6)H_(5)CH_(2)OH+CH_(3)COOHoverset(NaOH)rarr`

Answer :A::B::C
Discussion
14985.

Unit of rate constant depends on

Answer»

ORDER of reaction
molecularity of the reaction
concentration TERMS
number of REACTANTS

Solution :It is a FACT.
Discussion
14986.

Which of the following is/are connectprocess for the separation of given ions ?

Answer»

`Cu^(2+)` from the mixture of `Cu^(2+)`and `Cd^(2+)` in aqueous solution
`Cu^(2+)+ Cd^(2+) overset("Add excess") underset(KCN) tooverset("Pass"H_(2)S) underset("and filter") toCu^(2+)`in the filtrate
`Cu^(2+)` from the mixture of `Cu^(2+)`and `Cd^(2+)` in aqueous solution
`Cu^(2+)+ Cd^(2+) overset("Add excess") underset(KCN) tooverset("Pass" H_(2)S) underset("and filter") toCu^(2+)`in the precipitate
`Zn^(2+)` from the mixture of `Zn^(2+)`and `Cu^(2+)` in aqueous solution
`Zn^(2+)+ Cu^(2+) overset(H_(2)S+dil HCI) tooverset("Filter") TOZN^(2+)`in the precipitate
`Fe^(3+)` from the mixture of `Fe^(2+)`and `Fe^(2+)` in aqueous solution
`Fe^(2+)+ Fe^(3+) overset(NH_(4)CI +NH_(3))overset("solution and filter")RARR Fe^(2+)`in the precipitate

Answer :a,b
Discussion
14987.

Which of the following oxides is basic ?

Answer»

<P>`N_(2)O_(5)`
`P_(4)O_(10)`
`N_(2)O_(5)`
`Bi_(2)O_(3)`

Answer :D
Discussion
14988.

Which of the following reactions is possible?

Answer»

`C_(6)H_(5)OH+HBr to C_(6)H_(5)Br+H_(2)O`
`(CH_(3))_(3)C Cl+NaOCH_(3) to (CH_(3))_(3)COCH_(3)+NaCl`

ANSWER :D
Discussion
14989.

When an electric current is passed through an aqueous solution of sodium chloride :

Answer»

`H_2` is EVOLVED at the anode
Oxygen is evolved at the cathode
Its `PH` PROGRESSIVELY decreases
Its `pH` progressively inreases

Answer :D
Discussion
14990.

What weight of glycerol would have to be added to 1000g of water in order to lower its freezing point by 10^(@)C? K_(f)=1.86

Answer»


ANSWER :`495g`
Discussion
14991.

Write the reagents required in the following reactions: (i) CH_(2)=CH-CH_(2)Ohoverset(?)(CH_(2)=CH-CHO (ii) CH_(3)-COOHoverset(?)(to)CH_(3)-CONH_(4)

Answer»

Solution :(i)`CH_(2)=CH-CH_(2)Ohunderset("Chlorochromate")OVERSET("PYRIDINIUM")(to)CH_(2)=CH-CHO`
(II) `CH_(3)-COOHunderset((ii)"Heat")overset((i)NH_(3))(to)CH_(3)-CONH_(2)`
Discussion
14992.

Which of the following sets contain only non-biodegradable polymers?

Answer»

PLASTIC, PVC, NYLON
 Plastic, PVC, PHBV
PHBV, PVC, DEXTRON
PHBV, Dextron, Nylon-2-nylon-6

Answer :A
Discussion
14993.

When a heated Pt wire is introduced into a mixture of NH_3 and air

Answer»

PT FORMS the OXIDE
`NO and H_2O` are formed
Pt forms oxide and NITRIDE
`N_2O and H_2O` are formed

Answer :B
Discussion
14994.

Which of the following gases has the highest value of r.m.s. velocity at 298 K ?

Answer»

`CH_(4)`
CO
`Cl_(2)`
`CO_(2)`

Solution :Root mean square velocity, `u = sqrt((3RT)/(M))`
From the above EQUATION, LOWER the molecular mass, HIGHER the RMS-velocity.
Discussion
14995.

Which statement is not true

Answer»

`Ni(CO_(4)) ` is diamagnetic
`BI_(3)` is STRONGER lewis ACID than `BF_(3)`
Graphite conducts electricity whereas diamond does not
`C Cl_(4)` is hydrolysed whereas `BCl_(3)` is INERT

Answer :D
Discussion
14996.

Write the formula for dichlorotetraammine platinum (IV) ion

Answer»

Solution :`[PT(NH_(3))_(4)Cl_(2)]^(2+)`
Discussion
14997.

Which of the following are not transuranium elements ?

Answer»

Th and PA
CF and BK
Md and LR
Am and Np

Answer :A
Discussion
14998.

Which of the following metal sulphide issoluble in hot and dil HNO_(3)?

Answer»

`Ag_(2)S`
`PBS`
`CDS`
`HgS`

Answer :a,B,c
Discussion
14999.

Which of the following group activates the benzene ring most towards electrophilic substitution

Answer»

`-CHO`
`-NR_2`
`-NHCOCH_3`
`-NO_2`

SOLUTION :`-NR_2` is a `+R` GROUP
Discussion
15000.

What is lanthanide contraction and what are the effects of lanthanide contraction?

Answer»

Solution :As we move ACROSS 4f series, the atomic and ionic radii of lanthanoids show gradual DECREASE with increase in atomic number. This decrease in ionic size is called lanthanoid contraction. Effects (or) Consequences of lanthanoid contraction:
1. Basicity differences: As we move from `Ce^(3+)` to `Lu^(3+)`, the BASIC character of `Lu^(3+)`ions decrease. Due to the decrease in the size of `Lu^(3+)` ions, the ionic character of Ln -OH bond decreases (covalent character increases) which results in the decrease in the basicity,
2. Similarities among lanthanoids: In the complete f-series only 10 pm decrease in atomic radii and 20 pm decrease in ionic radii is observed. Because of this very small change in radii of lanthanoids, their chemical properties are quite similar.
The elements of second and third transition series resemble each other more CLOSELY than the elements of first and second transition series due to lanthanoid contraction. For example,
4d series - Zr - Atomic radius 145 pm
5d series Hf - Atomic radius 144 pm
Discussion