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21951.

Thermal decomoposition of ammonium dichromate gives

Answer»

`O_2`
`N_2`
`NH_3`
`H_2`

ANSWER :B
Discussion
21952.

Which of the following one is not able to form finally by the hydrolysis of DNA or RNA

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Hexose SUGAR
PHOSPHORIC acid
PURINE
Pyrimidine

ANSWER :A
Discussion
21953.

Which compound undergoes iodoform reaction

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`HCHO`
`CH_(3)CHO`
`CH_(3)OH`
`CH_(3)COOH`

Solution :`CH_(3)CHO OVERSET(NaOH)underset(I_(2))RARR underset("yellow ppt")(CHI_(3))`
Discussion
21954.

When acetaldehyde reacts with I_2in KOH, Iodoform is formed. How many molecules of KOH arerequired for the reaction to give a molecule of CHI_3

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SOLUTION :
Discussion
21955.

Which is not a redox reaction ?

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`BaO_2 + H_2SO_4 rarrBaSO_4 + H_2O_2`
`2BaO + O_2 rarr2BaO_2`
`4KCIO_3 rarr4KCIO_2 +2O_2`
`SO_2 +2H_2S RARR 2H_2O +3S`

ANSWER :A
Discussion
21956.

Tyndall effect is a______ property of colloidal particles.

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optical
kinetic
electrical
eletronic

Answer :A
Discussion
21957.

What happens when ethanol reacts with cone. Sulphuric acid at 413 K?

Answer»

SOLUTION :When ethanol reacts with con.`H_2SO_4`at 413 K, inter MOLECULAR dehydration take PLACE and diethyl ether is formed as product.
`UNDERSET("Ethanol")(2CH_3 - CH_2OH) underset(413 K)overset(CONC. H_2SO_4)tounderset("Diethyl ether")(CH_3-CH_2 - O - CH_2- CH_3 - H_2O)`
Discussion
21958.

Where E = electrophile, L.G. = Leaving Group based on the above answer the following Which of the following does not give phenolic type compound on acidic hydrolysis.

Answer»




ANSWER :A
Discussion
21959.

Where E = electrophile, L.G. = Leaving Group based on the above answer the following Which of the following products cannot be formed without blocking reagent action on phenol ?

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ANSWER :C
Discussion
21960.

Where E = electrophile, L.G. = Leaving Group based on the above answer the following Which of the following combination give aryl alkyl ethers on heating

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ANSWER :A
Discussion
21961.

Which is not essential for rusting ?

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Oxygen
Water
Carbon dioxide
Iron

Answer :C
Discussion
21962.

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

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`Cis-[Pt(NH_(3))_(2)Cl_(2)]` is used as an ANTICANCER species.
Carboxypeptidase-A is an enzyme and contains zinc.
In the silver ELECTROPLATING of copper, `K[Ag(CN)_(2)]` is used in place of `AgNO_(3)`.
`CN^(-)` ions show the REDUCING as well as complexing properies towards metal species.

Answer :A::B::C::D
Discussion
21963.

What is the action of bromine water on Benzenamine (Aniline) at room temp.

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Solution :Aniline REACTS with bromine water at ROOM temperature to give a WHITE PRECIPITATE of 2, 4, 6 - Tribromoaniline.
Discussion
21964.

The vapour pressureof a solution of 5g of a non-electrolyte in 100g water at a particular temperatureis 2950Pa and that of pure water at the same temperature is 3000Pa. The molar mass of the solute is

Answer»

`54G MOL^(-1)`
`119 G mol^(-1)`
`179 g mol^(-1)`
`229g mol^(-1)`

ANSWER :A
Discussion
21965.

Which of the following orders is incorrect for the properties indicated against each ?

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`[Cr(NH_(3))_(6)]^(3+) gt [Mn(CN)_(6)]^(3-) gt [V(CO)_(6)]""-` magnetic moment (spin only values in B.M.)
`[Co(CN)_(6)]^(3-) gt [Co(NH_(3))_(6)]^(3+) gt [Co(H_(2)O)_(6)]^(3+)""-Delta_(0)` values
`[Ni(CO)_(4)] gt [Co(CO)_(4)]^(-) gt [FE(CO)_(4)]^(2-)""-` strength of `M-Cpi` BOND.
`[Fe(CN)_(6)]^(3-) lt [Co(CN)_(6)]^(4-) lt [Ni(NH_(3))_(6)]^(2+)""-` effective atomic number of metal ion.

Solution :`(1)Cr^(3+)-3d^(3)` configuration `(t_(2g)^(1,1,1).e_(g)^(0,0)),Mn^(3+)-3d^(4)` configuration `(t_(2g)^(2,1,1).e_(g)^(0,0)),(V)-3d^(5)` configuration `(t_(2g)^(2,2,1).e_(g)^(0,0))`
`(2)Delta_(0)prop` strength of ligand for same oxidation state of central meta.
`(3)` In carbonylate anion, the metal has a GREATER electron density to be dispersed, with the RESULT that `M-Cpi`
`(4)``[Fe^(III)(CN)_(6)]^(3-),EAN=23+12=35`
`[Co^(II)(CN)_(6)]^(4-),EAN=25+12=37`
`[Ni(NH_(3))_(6)]^(2-),EAN=26+12=38`
Discussion
21966.

What is the product of reaction between excess xenon and fluorine at 673 K temperature ?

Answer»

`XeF_(2)`
`XeF_(4)`
`XeF_(6)`
Not GIVEN

ANSWER :A
Discussion
21967.

What precaution should be taken before administrating penicillin to a patient ?

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Solution :To CONFIRM BEFOREHAND that the patient is not ALLERGIC to penicillin.
Discussion
21968.

Which of the following is a reducing agent?

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`Mn^(3+)`
`Cr^(2+)`
`CO^(3+)`
`TI^(4+)`

ANSWER :B
Discussion
21969.

The unit cell with the structure below refers to …….. Crystal system.

Answer»

Cubic
Orthorhombic
Tetragonal
Trigonal

Answer :B
Discussion
21970.

The Van't Hoff factor (i) accounts for

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extent of DISSOLUTION of solute
extent of dissociation of solute
extent of mobility of solut
extent of solubility of solute

Solution :van't HOFF FACTOR (i) expresses the extent of association or dissociation of solute in the solution.
Discussion
21971.

Which of the following set of reactions give acetic acid only?

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`CH_(3)-CH= CH- CH_(3) overset("[O]")to `
`CH_(3)- UNDERSET(OH)underset(|)CH-CH_(2)-CH_(3)overset("[O]")to `
`CH_(3)-CH_(2)-OH overset("[O]")to `
`CH_(3)- underset(OH)underset(|)CH-CH_(3)overset("[O]")to `

Solution :`CH_(3)-CH=CH-CH_(3) overset("[O]")to 2CH_(3)COOH`
`CH_(3)-underset(OH)underset(|)CH- CH_(2)-CH_(3) overset("[O]")to CH_(3)COOH+ C_(2)H_(5)COOH`
`CH_(3)CH_(2)OH overset("[O]")to CH_(3)COOH`
`CH_(3)-underset(OH)underset(|)CH-CH_(3) overset("[O]")toCH_(3)COOH`
Discussion
21972.

Which of the following will be most covalent:-

Answer»

NaCl
`Na_(2)S`
`MgCl_(2)`
MgS

SOLUTION :POLARISATION `PROP (1)/("size of cation") prop` size of anion
`Na_(2)S lt MgS` - colvalent character
Discussion
21973.

What is Frenkel defect ? How does it affect density of the solid ?

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SOLUTION :Dislocation of SMALLER ion (CATION) from its normal site to INTERSTITIAL site. DENSITY is not affected
OR
Density remains same
OR
Does not change in the density.
Discussion
21974.

Which of the following alkali metal ion in aqueous solution is the best conductor of electricity?

Answer»

`LI^+`
`NA^+`
`CS^+`
`k^+`

Answer :C
Discussion
21975.

Which of the following compounds have restricted rotation and out of which can show geometrical isomerism? (iii) CICH=CHCI (iv) Ph-N=N-Ph (v) CH_(3)CH=C(CH_(3))_(2)(vi) CH_(3)CH=CH_(2)(vii) CH_(3)CH=CHCH_(3)(viii) CH_(3)-C-=C-CH_(3)

Answer»


ANSWER :Restricted ROTATION PRESENT in all the options but geometircal isomersim shown by ii, iii, iv, VIII.
Discussion
21976.

Which species is diamagnetic?

Answer»

`Ca^2+`
`Hg_2CI_2`
`Sb^3+`
All

Answer :D
Discussion
21977.

Which of the following pairs have approximately the same atomic radii?

Answer»

ZR and Hf
Al and Mg
Al and Ga
Na and Ne

Answer :A::C
Discussion
21978.

What happens when phenyl cyanide is treated with a dilute mineral acid ?

Answer»

Solution :BENZOIC acid is formed
` UNDERSET("Phenyl cyanide")(C_6 H_5CN+ H_2 O ) overset( H^(+))toC_6H_5CONH_2 underset(HCl) overset(H_2 O)to underset("Benzoic acid ") (C_6 H_5COOH +NH_4 Cl)`
Discussion
21979.

Which are the correct statements

Answer»

`CHCl_(3)+C Cl_(4)`- Endothermic solution
ACETIC ACID +Pyridine - Hot solution
`HNO_(3)`+Water- Endothermic solution
Water+HCl- Minimum azeotrope

Answer :1,2
Discussion
21980.

White phosphorus (P_(4)) does not have :

Answer»

SIX `P-P` single bonds
four `P-P` single bonds
four LONE pairs of electrons
PPP angle of `60^(@)`.

ANSWER :B
Discussion
21981.

Which is likely to have the highest melting point ?

Answer»

`CHCl_(3)`
CSF
`NH_(3)`
He

Answer :B
Discussion
21982.

Which of the following will not give iodoform reaction?

Answer»

METHYL alcohol
Ethyl alcohol
Acetaldehyde
Acetone

Answer :A
Discussion
21983.

Which of the following order (s) is/are correct ?

Answer»

`H_(3) PO_(4) gt H_3PO_(3) gt H_3 PO_(2)` (reducing character)
`N_(2) O lt NO lt N_(2)O_(3) lt N_(2)O_(5)` (oxidation STATE on nitrogen)
`NH_(3) gt PH_(3) gt AsH_(3) gt SbH_(3)` (basicity)
`SbH_(3) gt NH_(3) gt AsH_(3) gt PH_(3)` (reducing character)

Solution :a) Reducing character : `H_3PO_(4) gt H_2PO_3 gt H_(3)PO_2`
B)`overset(+1)(N_2O)lt overset(+2)(NO)ltoverset(+3)(N_2O_3)lt overset(+5)(N_2O_5)-` oxidation state on nitrogen
c) `NH_3 gt PH_3gt AsH_3gt SbH_3("Basicity"alpha1/("SIZE of the central atom"))`
d) Reducing nature `alpha(1)/("Thermal stability")underset("reducing agent")underset("strong")(underset(UARR)(SbH_3))gtAsH_3gtPH_3gtunderset("weak reducing agent")underset(uarr)(NH_3)`
Discussion
21984.

The solubility of a gas in water at 300 K under a pressure of 100 atmospheres is 4xx10^(-3) "kg L"^(-1). Therefore, the mass of the gas in kg dissolved in 250 mL of water under a pressure of 250 atmospheres at 300 K is

Answer»

`2.5xx10^(-3)`
`2.0xx10^(-3)`
`1.25xx10^(-3)`
`5.0xx10^(-3)`

ANSWER :A
Discussion
21985.

The temperature coefficient of a reaction is 2.5. If its rate constant at T_(1)K is 2.5xx10^(-3)s^(-1), the rate constant at T_(2)K in s^(-1) is (T_(2)=10+T_(1))

Answer»

`1.0xx10^(-3)`
`6.25xx10^(-3)`
`1.0xx10^(-2)`
`6.25xx10^(-2)`

ANSWER :B
Discussion
21986.

Uracil containing nucleotide differs from thymine containing nucleotide in having

Answer»

HYDROXYL GROUP on 2ND carbon in sugar and presence of `CH_3` group in NITROGEN BASE.
Hydrogen atoms on 2nd carbon in sugar and absence of`CH_3`group in nitrogen base.
Hydroxyl group on 2nd carbon in sugar and absence of `CH_3` group in nitrogen base.
Hydrogen atoms on 2nd carbon in sugar presence of `CH_3` group in nitrogen base

Answer :C
Discussion
21987.

Which structure of protein is alpha-(alpha) helix ?

Answer»

TERTIARY
SECONDARY
Primary
Quarternary

SOLUTION :Secondary
Discussion
21988.

Which neutral molecule would be isoelectronic with CIO^(-)?

Answer»

Solution :`CIO^(-)` has a TOTAL of 26 (17+ 8+1) electrons. The NEUTRAL molecule having 26 electrons = CIF
`therefore CIO^(-)`is ISOELECTRONIC with CIF.
Another neutral molecule having 26 electrons is `OF_2`
`thereforeCIO^-`is also isoelectronic with the neutral molecule `OF_2.`
Discussion
21989.

Which of the following may be used as anti-inflammatory as well as analgesic?

Answer»

 Aspirin
Bithional
Morphine
Equanil

Answer :A
Discussion
21990.

Which statement(s) is /are correct about Brown ring test ?

Answer»

This test is given by `NO_(2)^(-) , NO_(3)^(-)` anions.
Brown RING test DEPEND upon the reduction of `NO_(2)^(-) " and" No_(3)^(-)` to Nitric oxide.
Brown ring is formed due to formation of `[Fe(H_(2)O)_(5)NO]_(2)(SO_(4)_(3)`
Charge on NO in brown ring complex is `+1`.

ANSWER :A::B::D
Discussion
21991.

The time required to deposit 90 g of Al from an electrolytic cell containing Al_(2)O_(3)by a current of 965 A (At.mass of Al = 27)

Answer»

20 min . 20 sec
16 min . 40 sec
40 min 20 sec
26 min

SOLUTION :W = 90 gm , i= 965 A , t = ? W = Zit `therefore t = (W)/(ZI)`
`Z = ("Eq. MASS")/(96500)`
for AL , Eq. mass `= (27)/(3) therefore Z = (27)/(3 xx 96500)`
`t = (90 xx 3 xx 96500)/(27 xx 965) = 1000` sec = 16 min . 40 sec
Discussion
21992.

What are the drawbacks of Werner’s co-ordination theory ?

Answer»

Solution :Drawbacks of WERNER.s co-ordination theory are given below:(i) (i) It does not EXPLAIN the cause of various properties like color, geometry and magnetic properties. (ii) (ii) Werner has no justification for his proposed theory. It is because the electronic theory which FORMS the basis for all TYPES of bonding were not discovered at that time
Discussion
21993.

Write the structural formula of PCl_(5(s)).

Answer»

SOLUTION :
Discussion
21994.

Which vitamin deficiency causes the diseases pernicious anaemia?

Answer»

SOLUTION :VITAMINE - `B_(12)` or `B_(12)`
Discussion
21995.

Which of the following is both neutral and paramagnetic

Answer»

`NH_(3)`
`PH_(3)`
`AsH_(3)`
`SbH_(3)`

ANSWER :A
Discussion
21996.

Write the equations for the steps in SN-1 mechanism of the convertion of tert-Butyl bromide into tert-butyl alcohol.

Answer»

SOLUTION :
Discussion
21997.

Which effect observed by large amount of morphine ?

Answer»

COMA 
Convulsions
Stupar
All of the GIVEN

Solution :All of the given
Discussion
21998.

Which of the following solutions has maximum freezing point depression at equimolal concentration ?

Answer»

`[CO(H_2O)_6]Cl_3`
`[Co(H_2O)_6Cl]Cl_2.H_2O`
`[Co(H_2O)_4Cl]Cl.2H_2O`
`[Co(H_2O)_3Cl_3].3H_2O`

ANSWER :A
Discussion
21999.

Two electrodes having cross sectional area of A and are separated by a distance l. What is the ratio of length by area called?

Answer»

SOLUTION :The RATIO `(l/A)` is CALLED the CELL CONSTANT.
Discussion
22000.

which of the statementsgiven above is/are correct?

Answer»

`HIO_(4)ltHIltICIltI_(2)`
`HIltI_(2)ltICIltHIO_(4)`
`I_(2)ltICIltHIO_(4)ltHI`
`ICIltHIO_(4)ltHIltI_(2)`

Solution :Oxidation of lodinine in the give SPICES are
`I_(2), HI^(-1)ICI^(+1),HI^(+7)O_(4)`
Hence the correct order is
`HI LT I_(2) ICI lt HIO_(4)`
Discussion