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9201.

The reagent which does not react with both, acetoneand benzaldehyde is ______ .

Answer»

SODIUM hydrogensulphite.
phenyl hydrazine
Fehling's SOLUTION
Grignard reagent

Solution :Fehling's test is given by liphatic ALDEHYDES only.
Discussion
9202.

Which element cannot be detected by Lassaigne's test?

Answer»

Nitrogen
Sulphur
Oxygen
Phosphorus

Answer :C
Discussion
9203.

Which of the following facts regarding boron and silicon in true?

Answer»

Boron is used to make boron steel or boron carbide control rods for nuclear reactor.
Boron and silicon form HALIDES which are not hydrolysed.
Boron and silicon react with magnesium to form magnesium boride and magnesium silicide which are decomposed by acids to give VOLATILE borane and SILANE, respectively.
Both boron and silicon react with alkali to form borates and silicates containing `BO_(3)^(3-)` and `SIO_(4)^(4-)` tetrahedral units, respectively.

Solution :(B)`BCl_(3)+3H_(2)O overset("Hydrolysis")to H_(3)BO_(3) + 3HCl , SiCl_(4)+3H_(2)O overset("Hydrolysis")to H_(2)SiO_(3) + 4HCl`
( C)`B+Mg to Mg_(3)B_(2) +H_(3)PO_(4) to "Mix of borones" overset(Delta) to B_(2)H_(6)`
(D)`2B+6NaOH to 2Na_(3)BO_(3) + 3H_(2) , Si+4NaOH to Na_(4)SiO_(4) + 2H_(2)`
Discussion
9204.

Variety of products are obtained when dicarboxylic acids are heated. The nature of product depends on the carbon chain length seperating the two carboxylic groups. (I) 1 ,2 and 1,3-dibasic acids on heating give monocarboxylic acid (II) 1,4 and 1,5-dibasic acids on heating give cyclicanhydride (III) 1,6 and 1,7-dibasic acids give cyclic ketones. Indicate whether the following reactions are right or wrong.

Answer»


ANSWER :a
Discussion
9205.

Which of the following statement (s) is/are incorrect ?

Answer»

Maganess salt give a violet borax head test in reducing flame
Form a mixed precipitate of `AgCI` and `AgI` amonia SOLUTION dissolve only `AgCI`
Ferric ions give a deep green precipitateon adding potassium ferroyanide solution
On boling the solution having `K^(THETA),CU^(2+)` and `HCO_(3)^(Theta)` ions we get a percipitate of `K_(2)Cu(CO_(3))_(2)`

Answer :a,c,d
Discussion
9206.

Which is most commonly used to dry organic liquids ?

Answer»

Lithium
Sodium
Potassium
Rubidium

Answer :B
Discussion
9207.

Among the following, the most basic oxide is-

Answer»

ZnO
MgO
`Al_2O_3`
`N_2O_5`

ANSWER :B
Discussion
9208.

Which one of the follow is not zero order reaction ?

Answer»

`H_(2(g))+Cl_(2(g))OVERSET(hv)rarr2HCl_((g))`
`N_2O(g)hArrN_(2(g))+1/2O_(2(g))`
`CH_3COHO_((g))rarrCH_(4(g))+CO((g))`
`CH_3COCH_3+I_2overset(H^+)rarrICH_2COCH_3+HI`

ANSWER :C
Discussion
9209.

The volume of Cl_(2) " at " STP react with 10 g Fe to produce FeCl_(3) will be

Answer»


SOLUTION :N/A
Discussion
9210.

Write the relavant chemical equations : Chlorobenzene to p-nitrophenol

Answer»

SOLUTION :`2CH_3-CH_2-Cl + 2NA UNDERSET("ETHER")(RARR) CH_3-CH_2-CH_2-CH_3`
Discussion
9211.

Which of the following solutions of KCl has the lowest value of specific conductance ?

Answer»

1M
0.1 M
0.01 M
0.001 M

Answer :D
Discussion
9212.

Which of the following is a tridentate ligand?

Answer»

dien
trien
en
dmg

Answer :A
Discussion
9213.

When (NH_4)_2SO_4 + KCNO are heated, we get :

Answer»

Nitrogen
Carbon dioxide
Birret
Ammonium carbonate

Answer :C
Discussion
9214.

Urea is decomposed giving nitrogen and other substances when treated with:

Answer»

`HNO_(2)`
`HNO_(3)`
`H_(2)SO_(4)`(DIL.)
NaOH

Answer :A
Discussion
9215.

What are Y and Z in the following reactions ?

Answer»

SOLUTION :`Y to` solid `CO_(2)` (DRY ICE) `Z to R-COOH`
Discussion
9216.

Which of the following compounds is not a Lewis base ?

Answer»

Diethyl ether+`CI_(2)`
t-butyl alcohol
propaone
`:C CI_(2)`

Solution :DICHLORO METHYLENE (carbene or `:CCI_2`) is an ELECTRON dificient species and HENCE a Lewis ACID.
Discussion
9217.

What is the S.I. unit of mass ? How is it defined?

Answer»

SOLUTION :S.I. UNIT of MASS if KILOGRAM (KG).
Discussion
9218.

Two moles of an ideal monoatomic gas are allowed to expand adiabatically and reversibly from 300 K to 200 K. The work done by the system is (C_(v)=12.5JK^(-1)mol^(-1))

Answer»

`+2.5kJ`
`-2.5kJ`
`+6.25kJ`
`-50KJ`

ANSWER :B
Discussion
9219.

Which of the following sulphide ore is not concentrated by froth-floatation process ?

Answer»

Galena
Zinc blend
Argentite
Cinnabar

Answer :C
Discussion
9220.

The correct formulaof salt formed by the neutraliation of hypophosphorousacid with NaOH is

Answer»

`Na_3PO_2`
`Na_3PO_3`
`NaH_2PO_2`
`Na_2HPO_2`

SOLUTION :`H_3PO_2 + NAOH to NaH_2PO_2 + H_2O`
`H_2PO(OH) + NaOH to NaH_2PO_2 + H_2O`
Discussion
9221.

What is biodegradable polymer ? Give an example of a biodegradable polymer.

Answer»

SOLUTION :BIODEGRADABLE POLYMERS are those which are decomposed by micro organisms. E.g., PHBV (Poly-B-hydroxybutyrate – Co – B – HYDROXYL valerate).
Discussion
9222.

Which of the following will give a primary amine on hydrolysis :

Answer»

Nitroparaffin
Alkyl cyanide
Oxime
Alkyl isocyanate

Answer :D
Discussion
9223.

Which one of the following alcohols undergoesacid-catalysed dehydration to alkenes most readily ?

Answer»

`(CH_3)_2CHCH_2OH`
`(CH_3)_3COH`
`CH_3CHOHCH_3`
`CH_3CH_2CH_2OH`

ANSWER :B
Discussion
9224.

Which of the following will not lose asymmetry on reduction with LiAIH_(4)

Answer»




ANSWER :B
Discussion
9225.

Which of the following is added in soap to begin a antisptic property?

Answer»

BHA
Alitame
Bithional
Cyclamate

Answer :C
Discussion
9226.

The total number of optically active isomers for CH_2OH(CHOH)_3CHO are:

Answer»

16
8
4
2

Answer :B
Discussion
9227.

The reason for greater range of oxidation states in actinoids is attributed to -

Answer»

the RADIOACTIVE NATURE of actinoids
actinoid contraction
5f, 6d, and 7S levels having COMPARABLE energies
4f and 5d levels being CLOSE in energies

Answer :C
Discussion
9228.

Which reagent will you use for the following reaction ?CH_(3)CH_(2)CH_(2)CH_(3)rarr CH_(3)CH_(2)CH_(2)CH_(2)Cl+CH_(3)CH_(2)CHClCH_(3)

Answer»

`Cl_(2)//UV` light
`NaCl+H_(2)SO_(4)`
`Cl_(2)` gas in dark
`Cl_(2)` gas in the presence of iron in dark

Solution :Direct CHLORINATION of ALKANES TAKE place in presence of sunlight (UV light).
Discussion
9229.

The simplest way to check whether a sytem is colloidal is by

Answer»

electrodialysis
finding out PARTICLE size
Tyndall effect
Brownian movement

SOLUTION :A strong beam of light is PASSED through a given solution. If the path of light GETS illuminated, the solution is a colloidal solution. The phenomenon of scattering of light by solute particles is CALLED Tyndall effect.
Discussion
9230.

When 100 ml of 1M NaOH solution is mixed with 10 ml of 10 M H_(2)SO_(4), the resulting mixture will be

Answer»

ACIDIC
Alkaline
Neutral
Strongly alkaline

Solution :`N_(NaOH) = 1 xx 1 = 1N`
`N_(H_(2)SO_(4)) = 2 xx 10 = 20 N`
M. eq. of `NaOH = 1 xx 100 = 100`
M.eq. of `H_(2)SO_(4) = 20 xx 10 = 200`
THUS M.eq. of acid are left and therefore `pH LT 7`, so the resulting mixture will be acidic.
Discussion
9231.

Which one of the following is called hydrobenzamide?

Answer»

`C_6H_5NH - NH_2`

`(CH_2)_6N_4`
`CH_3-CH = NH`

SOLUTION :
Discussion
9232.

Write the IUPAC name of following complexes. K_2[HgI_4]

Answer»

SOLUTION :POTASSIUM tetraiodomercurate (II)
Discussion
9233.

Which of the following d block element has half filled penultimate d sub shell as well as half filled valence sub shell?

Answer»

Cr
Pd
Pt
none of these

Solution :`Cr = [Ar] 3D^(5) 4s^(1)`
Discussion
9234.

Which among the following statements are correct with respect to adsorption of gases on a solid? (i) The extent of adsorption is equal to kph according to Freundlich isotherm (ii) The extent of adsorption is equal to kp in according to Freundlich isotherm(iii)At high pressure, extent of adsorption becomesindependent of pressure. (iv) Freundlich adsorption isotherm fails at low pressure

Answer»

<P>(i) and (ii)
(ii) and(III)
(i)and (iv)
(iii) and (iv)

Solution :According to FREUNDLICH ADSOPRTION ISOTHERM `(x)/(m)= kp^(1//n)`
Also, according to Freundlich adsorption isotherm, at low pressure `(x)/(m) prop p`i.e., extent of adsorption varies directly with pressure.
Discussion
9235.

Vegetables oils or animal fats are ......

Answer»

they are glyceryl ester of the FATTY acid
they are SODIUM ester of fatty acid 
ALCOHOL ester of fatty acid
all of the GIVEN 

SOLUTION :they are glyceryl ester of the fatty acid
Discussion
9236.

Which of the following is correct for the Zeise's salt ?

Answer»

The complex ion is square planar
The CENTRAL metal ion, PLATINUM, is in `+II` oxidation state
`H_(2)C=CH_(2)` MOLECULE is PERPENDICULAR to the `PtCl_(3)` plane
All of these

Answer :D
Discussion
9237.

Which of the follosing aldol reaction product is correctly mention

Answer»

`CH_(3)-CH_(2)-UNDERSET(O)underset(||)(C)-H+CH_(3)-CH_(2)-CHO overset(OH)underset(DELTA)to CH_(3)-CH_(2)-CH=underset(CH_(3))underset(|)(C)-CHO`
`PhCHO+PH-underset(O)underset(||)(C)-CH_(2)-CH_(3)overset(OH)underset(Delta)toPh-CH=underset(CH_(3))underset(|)-overset(O)overset(||)(C)-Ph`
`PhCHO+CH_(3)COCH_(3) underset(Delta)to Ph-CH=CH-underset(O)underset(||)(C)-CH_(3)`

Solution :
Discussion
9238.

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

Answer»

SOLUTION :The three dimensional STRUCTURES of the three COMPOUNDS along with the direction of dipole moment in each of there are given below :

`C Cl_(4)`being symmetrical has zero dipole MOMENTS . In `CHCl_(3)` , the resultant of two `C - Cl` dipoles is opposed by the resultant of C - H and C - Cl bond. Since the latter resultant isexpected to be smaller than the former, `CHCl_(3)` hasafinite smaller dipole (`1.03`D) moment .
In `CH_(2)Cl_(2)`, the resultant of two C - Cl dipole moments is in the same direction as the resultant of two C - H dipoles. Therefore , `CH_(2)Cl_(2) (1.62 D)` has a dipole moment higher than that of `CHCl_(3)`.
Thus , `CH_(2)Cl_(2)` has the highest dipole moment .
Discussion
9239.

Which of the following is a product of hydrolysis of diethyl ether ?

Answer»

Ethene
Ethane
ETHANOL
Ethyne

Solution :Ethanol
Discussion
9240.

The volumes of gases H_(2), CH_(4), CO_(2) and NH_(3) adsorbed by one gram of charcoal at 288K are in the order

Answer»

`H_(2)gtCH_(4)gtCO_(2)gtNH_(3)`
`CH_(2)gtNH_(3)gtH_(2)gtCH_(4)`
`NH_(3)gtCO_(2)gtCH_(4)gtH_(2)`
`CH_(4)gtCO_(2)gtNH_(3)gtH_(2)`

Answer :C
Discussion
9241.

Three moles of B_(2)H_(6) are completely reacted with methanol. The number of moles of boron containing product formed is:

Answer»


ANSWER :6
Discussion
9242.

What is the IUPAC name of the compounds? CH_3- underset(CH_(3))underset(|)CH- underset(OH)underset(|)CH-underset(C_(2)H_(5))underset(|)CH- underset(OH)underset(|)CH- CH_(3)

Answer»

Solution :`overset(6)CH_3- UNDERSET(CH_(3))underset(|)overset(5)CH- underset(OH)underset(|)overset(4)CH-underset(C_(2)H_(5))underset(|)overset(3)CH- underset(OH)underset(|)overset(2)CHoverset(1)CH_(3)`
3-Ethyl-5-methylhexane-2,4-diol
Discussion
9243.

Which of the following crystallizes in hexagonal close packing ?

Answer»

CU 
NA 
ZN 
CS 

Answer :C
Discussion
9244.

Which ofthe followingis notan essential amino acid ?

Answer»

Valime
Lysine
HISTIDINE
GLYCINE

ANSWER :D
Discussion
9245.

Which will react faster with NBS?

Answer»

`C_(6)H_(6)`
`CH_(4)`
Toluene
Cyclorpropane

Solution :Toluene has an allyicgroup.
Discussion
9246.

Which of the following does not form an oxime?

Answer»

Glucose
Glucose PENTAACETATE
Arabinose
Galactose

Solution : Glucose pentaacetate does not FORM an OXIME because the GLYCOSIDIC - OH group is not free since it is involved in ring formation. As a result, it cannot get converted into the open chain form required for the formation of oxime.
Discussion
9247.

When two reactants, A and B are mixed to give produts, C and D, the reaction quotient, (Q) at the initial stages of the reaction

Answer»

Is zero
Decreases with time
Is independent of time
Increases with time

Solution :Reaction quotient `=([C][D])/([A][B])`
INITIAL stage `(C)=or [D]=0`
So, the value of quotient `=(0)/([A][B])=0` and increases with time.
Discussion
9248.

Which of the following has highly branched of structure like amylopectin?

Answer»

cellullose
maltose
fructose
glycogen

Answer :D
Discussion
9249.

Which of the following compounds has a negative enthalpy of solution?

Answer»

KCl
KBr
KF
KI

Answer :C
Discussion
9250.

Which of the following posses highest boiling point ?

Answer»

`C_2H_5Cl`
`CH_3 CHO`
`C_2H_5OH`
`CH_3 COOH`

ANSWER :D
Discussion