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12751.

Which of the following is wrong with respect to [Co(NH_(3))_(5)Cl]Cl_(2)

Answer»

CENTRAL METAL ion is Co and the ligands are `NH_3` and `Cl^(-)` ion
oxidation number of Co is +2
co-ordination number of Co is 6
the number of IONS formed when I mole of the compound dissolves in water is 3 moles

Answer :B
Discussion
12752.

Write structures of prudlucts of the following reactions : I) CH_3CH=CH_2overset(H_2 O //H^(+))(rarr) II) III) CH_3-CH_2underset(CH_3)underset(|)(CH)-CHO

Answer»

Solution :I) `CH_3-CH(OH)-CH_3`
II) `NaBH_4` can reduce aldehydes and ketones to the CORRESPONDING ALCOHOLS but it has no EFFECT on ester GROUP. Hence the product is

III) `CH_3-CH_2-underset(CH_3)underset(|)(CH)-CH_2OH`
Discussion
12753.

Which of given participates in Friedel-Crafts reaction

Answer»




ANSWER :D
Discussion
12754.

Which of the following is used in making textile and ropes

Answer»

Dacron
Perlon-L
Rayon
Both 1 & 3

Solution :Nylon-6 was refferedas perlon-L ALSO .
Discussion
12755.

Which ligand is capable of forming low spin well as high spin complexes:

Answer»

`CO`
`NO_2^-`
`NH^-`
`NH_3`

ANSWER :D
Discussion
12756.

The time required to pass 36,000 coulombs through an electroplating bath using a current of 10 amperes is

Answer»

THIRTY minutes
one HOUR
one hour 30 MINS
two hours

Solution :Q = 36,000 coulombs (C) , i= 10 A
`Q = ixxt , t = (Q)/(i) = (36,000)/(10)`
= 3600 seconds = 1 hours
Discussion
12757.

The two cyclic hemiacetal forms of glucose differing only in the configuration of the hydroxyl group at C-1 are called

Answer»

If both ASSERTION and REASON are TRUE and reason is the CORRECT EXPLANATION of assertion.
If both assertion and reason are true but reason is not the correct explanation of assertion.
If assertion is true but reason is false.
If both assertion and reason are false.

Answer :A
Discussion
12758.

What is the product of the reaction of H_(2)O_(2) with Cl_2

Answer»

`O_(2)+HOCl`
`HCl+O_(2)`
`H_(2)O+HCl`
`HCl+H_(2)`

SOLUTION :`H_(2)O_(2) +Cl_(2) to 2HCL +O_(2)`
Discussion
12759.

What are the following substances ? Give one example of each type . (i) Antacid (ii) Nonionic detergents (iii) Antiseptics

Answer»

Solution :(i) Antacid : These are those substances which neutralise the excess acid and bring the PH to appropriate level in stomach .
Examples : MAGNESIUM HYDROXIDE and sodium BICARBONATE .
(ii) Nonionic detergents : These are of high MOLECULAR mass formedby reaction between polythylene glycol and stearic acid .
(iii) Antiseptics : These are the chemical substances used to prevent the growth of micro-organisms or to kill them . They are safe to be applied to living tissues Dettol .
Discussion
12760.

When hydrolith is treated with water it yields :

Answer»

`H_2 `
`H_2O_2`
`N_2`
NaH

Answer :A
Discussion
12761.

When a particle as an electron exist in a box, three quantum numbers are necessary to describe the spatial distributioni fo electrons in atoms. The describe an electron in an atom completely, a fourth quantum number, m_(s) called the spin quantum number must be specified. This is because every electron has magnetic moment associated with it which is quantized in one of two possible orientations. Electrons having the same spin strongly repel each other and tend to occupy different region of space. This result of a fundamental law of nature is known as Pauli exclusion principle. The valence shell electron of sodium has the quantum numbers (n,l,m,s)

Answer»

`2,1,-1,-1/2`
`3,0,0,+1/2`
`3,2,-2,-1/2`
3,2,2,+1/2`

ANSWER :B
Discussion
12762.

When a particle as an electron exist in a box, three quantum numbers are necessary to describe the spatial distributioni fo electrons in atoms. The describe an electron in an atom completely, a fourth quantum number, m_(s) called the spin quantum number must be specified. This is because every electron has magnetic moment associated with it which is quantized in one of two possible orientations. Electrons having the same spin strongly repel each other and tend to occupy different region of space. This result of a fundamental law of nature is known as Pauli exclusion principle. The quantum numbers +1/2 and -1/2 for the electron spin represent

Answer»

ROTATION of the electron in clockwise and anticlockwise DIRECTION respectively
rotation of the electron in anticlockwise and clockwise direction respectively
magnetic moment of the electron pointing up and down respectively.
Two quantum mechanical spin STATES which have no CLASSICAL analogue

Answer :D
Discussion
12763.

Which of the following ethers is unlikely to be cleaved by not conc. HBr ?

Answer»




ANSWER :D
Discussion
12764.

When a particle as an electron exist in a box, three quantum numbers are necessary to describe the spatial distributioni fo electrons in atoms. The describe an electron in an atom completely, a fourth quantum number, m_(s) called the spin quantum number must be specified. This is because every electron has magnetic moment associated with it which is quantized in one of two possible orientations. Electrons having the same spin strongly repel each other and tend to occupy different region of space. This result of a fundamental law of nature is known as Pauli exclusion principle. For whcih one of the following sets of quantum numbers will an electron have the highest energy?

Answer»

`3,2,2,+1/2`
`4,2,-1,+1/2`
`4,1,0,-1/2`
`5,0,0,+1/2`

ANSWER :B
Discussion
12765.

When a particle as an electron exist in a box, three quantum numbers are necessary to describe the spatial distributioni fo electrons in atoms. The describe an electron in an atom completely, a fourth quantum number, m_(s) called the spin quantum number must be specified. This is because every electron has magnetic moment associated with it which is quantized in one of two possible orientations. Electrons having the same spin strongly repel each other and tend to occupy different region of space. This result of a fundamental law of nature is known as Pauli exclusion principle. The radius of whcih of the following orbit is same as that of the first Bohr's orbit of hydrogen atom?

Answer»

`He^(+)(n=2)`
`LI^(2+)(n=2)`
`Li^(2+)(n=3)`
`Be^(3+)(n=2)`

ANSWER :D
Discussion
12766.

When a particle as an electron exist in a box, three quantum numbers are necessary to describe the spatial distributioni fo electrons in atoms. The describe an electron in an atom completely, a fourth quantum number, m_(s) called the spin quantum number must be specified. This is because every electron has magnetic moment associated with it which is quantized in one of two possible orientations. Electrons having the same spin strongly repel each other and tend to occupy different region of space. This result of a fundamental law of nature is known as Pauli exclusion principle. The orbital angular momentum of an electron in 2s orbital is

Answer»

`+1/2 H/(2PI)`
zero at the nucleus
`h/(2pi)`
`SQRT(2)h/(2pi)`

ANSWER :B
Discussion
12767.

The reduction of CH_3CN " to " CH_3CH_2NH_2 is called :

Answer»

Rosenmund reduction
CLEMMENSEN's reduction
Mendius reduction
HOFMANN reaction.

ANSWER :C
Discussion
12768.

The standard reduction potnetials of 4 elements are given below. Which of the following will be the most suitable reducing agent? I=-3.04V,II+-1.90V,III=0V,IV=1.90V

Answer»

I
II
III
IV

Solution :ELEMENTS with least reduction POTENTIAL is most suitable REDUCING AGENT.
Discussion
12769.

Which of the following is an example of nuclear fission

Answer»

<P>`._(1)H^(2) + ._(1)H^(2) rarr ._(2)He^(4) + gamma`
A + B `rarr C +` ENERGY
`._(92)U^(235) + ._(0)N^(1) rarr ._(56)Ba^(141) + ._(36)Ke^(92) + 3 ._(0)n^(1) +` energy
`._(13)Al^(27) + ._(2)He^(4) rarr ._(15)P^(30) + ._(0)n^(1)`

Answer :C
Discussion
12770.

Write the IUPAC name of (i) [Co(NH_(3))_(5)NO_(2)]Cl_(2)(ii) [Cr(H_(2)O)_(5)SCN]^(2+)(iii) [CoCl(NO_(2))(en)_(2)]^(+)

Answer»

Solution :(i) pentaamminenitrocobalt (III) chloride(II) pentaaquathiocyanato CHROMIUM (III) ION
(iii) chlorido BIS (ethane-1, 2-diamine) nitrocobalt (III) ion
Discussion
12771.

When phosphine is heated with air it burns to gives, ………….. .

Answer»

Orthophosphoric ACID
METAPHOSPHORIC acid
Pyrophosphoric acid
Phosphoroustrioxide

Solution :Metaphosphoric acid
Discussion
12772.

Which of the following represents chelating ligand?

Answer»

`CL^(-)`
DMG
`OH^(-)`
`H_2O`

ANSWER :B
Discussion
12773.

What is the weight of oxygen that is required for the complete combustion of 2.8 kg of ethylene :

Answer»

2.8 kg
6.4 kg
96.0 kg
9.6 kg

Answer :D
Discussion
12774.

Which of the following showoxidation state of +4 ?

Answer»

Ce
Ac
Th
U

Solution :For (B)and for (C ) ,`KMnO_(4)`in presence of KOH FORMS `K_(2)MnO_(4)` and oxygen produced oxidizes HCHO to HCOOH and then to `CO_(2)` and `H_(2)O`.
Discussion
12775.

Which of the following are the correct orders of basic character?

Answer»




Solution :a. (I) No delocalisation of `LP bar(e)`'s on N and `sp^(3)`
(II) Delocalisation of `LP bar(e)`'s of one N atom, but no delocalisation of `LP bar(e)`'s on second N.
(III) No delocalisation of `LP bar(e)`'s of N, but `sp^(2)`.
B. (I) No delocalisation of `LP bar(e)`'s of N.
(II) Delocalisation of `LP bar(e)`'s of N by `(C=O)` GROUP.
c. (I) No delocalisation of `LP bar(e)`'s on N.
(II) Delocalisation of `LPbar(e)`'s of N.
d. The ORDER is `(I) GT (II) gt (II)`.
(III) Delocalisation of `LP bar(e)`'s of one `N` but no delocalisation of second N atom `LP bar(e)`'s and `sp^(2).
(II) Delocalisation of `LP bar(e)`'s of N and `sp^(2)`.
Discussion
12776.

When temperature is raised, chemisorption______.

Answer»

INCREASES
DECREASES
FIRST decreases and then increases
first increases and then decreases

Answer :D
Discussion
12777.

Whatis thedifference betweenactivatedcomplex and unstableintermediate ?

Answer»

Solution :An unstable intermediate is an actual CHEMICAL SPECIES. It has normal BOND orders. It may be stabilised under different reaction conditions. Activated complex is postulated species, which has maximum energy during the conversion from reactants to products. No MATTER which way the bond lengths and bond STRENGTHS vary, stabilisation does not results.
Discussion
12778.

Which ion has a higher polarising power ?

Answer»

`MG^(2+)`
`Al^(3+) `
`CA^(2+) `
`Na^+`

Answer :B
Discussion
12779.

Which of the following sets of quantum numbers is not possible ?

Answer»

n=2, l=1, m=-1, s=-1/2
n=2, l=1, m=-1, s=+1/2
n=3, l=0, m=-2, s=+1/2
n=3, l=2, m=-3, s=+1/2

Answer :D
Discussion
12780.

Which reagent distinguishes ehtylene from axtylene?

Answer»

Aqueous ALK. `KMnO_4`
`CL_2` DISSOLVED in `C Cl_4`
Ammonical `CU_2Cl_2`
Ammonical `AgNO_3`

Answer :C::D
Discussion
12781.

Whichstep isnotinvolvedin hydrometallurgical process ?

Answer»

`Cu_ 2S+2 Cu_ 2 Oto6 CU +SO _ 2`
` CuSO_ 4+FetoCu+FeSO_ 4`
`Cu FeS_ 2+2H_ 2SO _ 4 toCu SO _ 4+Fe SO _4+2 H_ 2 S `
` Cu CO _ 3+H _ 2 SO _ 4toCu SO _4+CO_ 2 +H _ 2 O`

ANSWER :A
Discussion
12782.

Which of the following can act as both Bronsted acid and Bronsted base ?

Answer»

`Na_(2)CO_(3)`
`OH^(-)`
`HCO_(3)^(-)`
`NH_(3)`

Solution :`H_(2)CO_(3) HARR OVERSET(+)H+Hcoverset(-)O_(3) hArr overset(+)H+C overset(-)O_(3)`
`HCO_(3)^(-)` can donate and ACCEPT `H^(+)`
Discussion
12783.

Zinc can be coated on iron to produce galvanized iron but the reverse is not possible. It is because

Answer»

Zinc is LIGHTER than iron
Zinc has lower melting POINT than iron
Zinc has lower negative electrode potential than iron
Zinc has HIGHER negative electrode potential than iron

Solution :`E_(Zn^+|Zn)^@ = -0.76 and E_(FE^(2+)|Fe)^(@) = -0.44 V`. Zinc has higher negative electrode potential than iron, iron cannot be coated on zinc.
Discussion
12784.

Which nomenclature is not according to IUPAC system

Answer»

`Br-CH_(2)-CH=CH_(2)`, 1-BROMO-prop-2-ene
`{:(""CH_(3)),("|"),(CH_(3)-CH_(2)-C-CH_(2)-CHCH_(3)","),("|""|"),(""Br""CH_(3)),("4 - Bromo, 2, 4-di-methylhexane"):}`

`{:(CH_(3)-C-CH_(2)-CH_(2)-CH_(2)COOH),("||"),(""O),("5-Oxohexanoic acid"):}`

SOLUTION :`Br-underset(3)(C)H_(2)-underset(2)(C)H = underset(1)(C)H_(2)`.
the correct name is 3-Bromoprop-1-ene.
Discussion
12785.

Which coagulates white of an egg ?

Answer»

Orthophosphoric ACID
Metaphosphoric acid
Hypophosphoric acid
Pyrophosphoric Acid

Answer :B
Discussion
12786.

Which is false ?

Answer»

The greater the concentration of the substances involved in a reaction, the lower the speed of the reaction
The POINT of dynamic EQUILIBRIUM is reached when the reaction rate in one DIRECTION just balances the reaction rate in the opposite direction
The DISSOCIATION of weak electrolyte is a reversible reaction
The presence of free ions FACILITATES chemical changes

Answer :A
Discussion
12787.

Vapour pressure of chloroform and dichloroethane at 298K are 200 mm Hg and 415 mm Hg respectively. If the mole fraction of chloroform is 0.312. calculate vapour pressure of the solution.

Answer»

<P>

SOLUTION :VAPOUR pressure of chloroform `p_(1)^(0)=200` mm Hg
Vapour pressure of dichloroethane `p_(2)^(0)=415` mm Hg
Mole FRACTION of chloroform `n_(1)=0.312`
Mole fraction of dichloroethane `=n_(2)=1-0.312=0.6878`
`p_(T)=p_(1)^(@)x_(1)+p_(2)^(0)x_(2)`
`P_(T)=200xx0.312+415xx0.688`
`62.4+285.52=347.9` mm Hg.
Discussion
12788.

Whichof the followingcompound isChiral (Opticallyactive )

Answer»



Both
NONE

ANSWER :D
Discussion
12789.

Which of the following act as a protective colloids?

Answer»

GELATIN
SILICA gel
Oil-in-water EMULSION
All CORRECT

SOLUTION :N//A
Discussion
12790.

Which of the following is magnesium bismuthide ?

Answer»

`Bi_(3)MG`
`Bi_(3)Mg_(2)`
`Mg_(3)Bi_(2)`
`Mg_(3)Bi`

ANSWER :C
Discussion
12791.

Where does the water present in the egg go after boiling the egg?

Answer»

SOLUTION :When the egg is boiled, the PROTEINS FIRST undergo denaturation and then coagulation, and the water present in the egs gets ABSORBED in the coagulated proteins.
Discussion
12792.

Which one of the following defects in the crystals lowers its density?

Answer»

FRENKEL defect
Schottky defect
F-centres
interstitial defect.

Solution :Schottky defect in the crystals lowers its density as it is caused if some of the lattice points are unoccupied. The points which are unoccupied are called vacancies or HOLES. The number of missing POSITIVE and negative ions is the same in this CASE and thus, the crystal REMAINS neutral.
Discussion
12793.

Which of the following is not an artificial sweetening agent ?

Answer»

Alitame
p-Hydroxybenzoate
Aspartame
Sucralose.

Answer :B
Discussion
12794.

Which of the following vitmains is present in all food stuffs ?

Answer»

`B_3`
`B_(12)`
`C`
A

Answer :A
Discussion
12795.

The standard emf of a galvanic cell involving cell reaction with n=2 found to be 0.295 V at 25^(@)C. The equilibrium constant of the reaction would be

Answer»

`2xx10^(11)`
`4xx10^(12)`
`1xx10^(2)`
`1xx10^(10)`

Solution :`E_(cell)^(o)=(2.303RT)/(nF)log" "K_(EQ)`
`0.295=(2.303xx8.314xx298)/(2xx96500)log" "K_(eq)`
`log" "K_(eq)=(2xx96500)/(2.303xx3.314xx298)=10`
`K_(eq)="antilog "10=1xx10^(10)`
Discussion
12796.

When the concentration is expressed as the number of moles of a solute per litre of solution it is known as

Answer»

NORMALITY
Molarity
Mole fraction
Mass PERCENTAGE

ANSWER :B
Discussion
12797.

Which of the following statement is incorrect regarding sulphur compounds

Answer»

`H_(2)S_(2)O_(8)`and `H_(2)SO_(5)` both have ONE O-O linkage 
 In `SF_(6)` & all S-F bonds are equivalent
`SCI_(2)OCH_(3))_(2)` and `SF_(2)(OCH_(3))_(2) -CH_(3)` groups in both case OCCUPY the equatorial POSITION 
 In `H_(2)S_(2)O_(3)` oxidation number of SULPHURIS +4 and 0

Answer :C
Discussion
12798.

Which of the follwoign ether will always give SN^(2) mechanism in acidic as well as basic conditions?

Answer»




Solution :`S` is LESS `EN` and, THEREFORE more reactive TOWARDS `SN^(2)`.
Discussion
12799.

What happens when white phosphorus is heated with concentrated NaOH solution in an inert atmosphere of CO_(2)?

Answer»

<P>

SOLUTION :Whitephosphoruswhenheatedwith concentrated NaOH solution in an inert atmosphere, phosphine is LIBERATED.
`P_(4) + 3NaOH + 3H_(2)O to underset("Phosphine")(PH_(3)) + 3NaH_(2)PO_(2)`
Discussion
12800.

Write one method for the preparation of CuSO_4. Also write its uses.

Answer»

SOLUTION :It is prepared by dissolving `CuCO_3` in DILUTE `H_2SO_4` ACID.
`CuCO_3 + H_2SO_4` rarr`CuSO_4 + CO_2 + H_2O`
Uses: (a) It is USED as a fungicide.
(b) It is used as electrolyte in copper PLATING.
Discussion