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16451.

Transition elements show magnetic moment due to spin and orbital motion of electrons. Which of the following metallic ions have almost same spin only magnetic moment?

Answer»

`Co^(2+)`
`CR^(2+)`
`MN^(2+)`
`Cr^(3+)`

Solution :Both `Co^(2) and Cr^(3+)` have 3 unpaired electrons and so both have ALMOST same spin only MAGNETIC moment.
Discussion
16452.

Write the chemicalreactionassociatedwith the ''boraxbeat test'' of cobalt (II) oxide

Answer»

Solution :Whenborax inheated , a colourless glassy head is formed of the following composition
`Na_(2)B_(4)O_(7) 10H_(2)O rarr Na_(2)B_(4)O_(7) + 10H_(2)O`
`Na_(2) B_(4)O_(7) OVERSET(Delta ) to+ 2NaBO_(2) + B_(2)O_(3)`
`Co(II) "salt" overset(Delta) to CoO +` some GAS
`CoO + B_(2)O_(3) overset(Delta) to Co(BO_(2))_(2)`
A BLUE - coloured head ofcoball METABORATE is formed
Discussion
16453.

Which of the following statement true ?

Answer»

ALDEHYDES are less SUSCEPTIBLE to oxidationthan ketones
All aldehydes undergo Cannizzaro REACTION
Aldehydes are more susceptible to oxidation than ketones
FORMALDEHYDE does not react with ammonia

Answer :C
Discussion
16454.

What is the scientific explanation for the feeling of depression ?

Answer»

SOLUTION :Noradrenaline is a NEUROTRANSMITTER which plays an IMPORTANT role in mood changes. If a person has LOW level of noradrenaline, then the message transfer process becomes slow and the person suffers from depression
Discussion
16455.

They lye is :

Answer»

10% SOLUTION of NaOH
10% solution of KOH
10% solution of NACL
`10 %` solution of a `Na_2CO_3`

ANSWER :A
Discussion
16456.

Zn on heatingwith barium carbonate gives:

Answer»

BaO
ZnO
`CO_2`
All of these

Answer :D
Discussion
16457.

What is the name given to 40% solution of formaldehyde ?

Answer»

SOLUTION :FORMALIN
Discussion
16458.

Which of the following combinations illustrates laws of reciprocal ?

Answer»

`N_20_3 ,N_2O_4 , N_2O_5`
`PH_3 , P_2O_5 , P_2S_5`
`CS_2, CO_2 , SO_2`
NACL , NABR , NaI

Answer :C
Discussion
16459.

Which one of the following is not a surfactant

Answer»


`CH_3-(CH_2)_14-CH_2-NH_2`
`CH_3-(CH_2)_16-CH_2OSO_2^(2-) NA^+`
`OHC-(CH_2)_14-CH_2-COO^- Na^+`

ANSWER :B
Discussion
16460.

The specific conductivity of dichloroacetic acid at dilution of 8 litres is 0.0238 C.G.S. unit, lambda_0fomthis acid is 385 C.G.S. unit, calculate the degree of jonisation at this dilution.

Answer»

`50%`
`45%`
`49.45%`
`36.02% `

Solution :`^^_M = K XX V(ML) = 0.0238 xx 8 xx 1000 = 190.4 , alpha = (^^_M)/(^^_M^(0)) = (190.4)/(385) xx 100 = 49.45%`
Discussion
16461.

Which of the following contains cobalt ?

Answer»

VITAMIN C
Haemonglobin
Chlorophyll
Vitamin `B_(12)`.

ANSWER :D
Discussion
16462.

Whichof thefollowingstatement is nottrueaboutclassicalsmog ?

Answer»

Its maincomponentsare PRODUCEDBY theactionof SUNLIGHT on emissionofautomoblieson EMISSION ofautombilesand factories .
Producedin coldand humidclimate.
it containscompoundsof reducing nature.
it containssmokdefogand sulphurdioxide .

ANSWER :A
Discussion
16463.

TlCl has NaCl structure, the coordination number of Tl^(+) in TlCl is :

Answer»

6
4
8
3

Solution :Like NACL, the COORDINATION NUMBER of `Tl^(+)` is 6.
Discussion
16464.

What is the type of particle formed after the contact of sodium stearate molecules with grease particle?

Answer»

Neutral
NEGATIVELY CHARGED.
Positively charged.
Positively charged from INSIDE and negatively charged from outside.

Answer :B
Discussion
16465.

Which of the following reagents cannot be used to distinguish between phenol and alcohol?

Answer»

`Br_2 // C Cl_4`
NAOH
`NaHCO_3`
NEUTRAL `FeCl_3`

ANSWER :C
Discussion
16466.

Which is a more volatile liquid ?

Answer»

`C_(2)H_(5)OH`
`CH_(3)COOH`
`C_(2)H_(5)OC_(2)H_(5)`
`C_(6)H_(6)`

Answer :C
Discussion
16467.

Which of the following complexes show linkage isomerism ?

Answer»

`[Co(NH_(3))_(5)(NO_(2))]^(2+)`
`[Co(H_(2)O)_(5)CO]^(3+)`
`[CR(NH_(3))_(5)SCN]^(2+)`
`[Fe(en)_(2)Cl_(2)]^(+)`

Answer :A::C
Discussion
16468.

What is crystal field splitting energy (CFSE) ?

Answer»

Solution :The difference of energy between two SETS of d-orbitals after splitting is called crystal FIELD splitting energy or crystal field stabilization ENERY (CFSE).
Discussion
16469.

Which isomer of hexane has only two different sets of structurally equivalent hydrogen atoms?

Answer»

2,2-Dimethylbutane
2-Methylpentane
3-Methylpentane
2,3-dimethylbutane and 2-methylpentane

Answer :D
Discussion
16470.

What is the relation between Delta_(t) and Delta_(0) ?

Answer»

SOLUTION :`Delta_(t)=4/9Delta_(0)`
Discussion
16471.

Which one of the following compounds forms benzoic acid on oxidation?

Answer»

Chlorophenol
Benzyl CHLORIDE
CHLOROBENZENE
CHLOROTOLUENE

ANSWER :B
Discussion
16472.

The shape of BrF_3 molecule is slightly bent 'T' , because

Answer»

The lone pairs occupy the equatorial position to minimize lone pair- lone pair and the bond pair-lone pair REPULSIONS
The axial fluroine ATOMS will be BENT towards the equatorial fluorine in orer to minimize the lone pair-lonepair repulsions.
According to the VSEPR theory, one lone pair of Br occupies the equatorial position and the second one occupied the axial position in order to minimize the lone pair-lone pair repulsion
Both (1) and (2)

Answer :D
Discussion
16473.

Which of the following is true for alkaline aqueous solution?

Answer»

`pH GT (pk_(w))/(2)`
`pH gt pOH`
`pOH lt (pk_(w))/(2)`
`pH lt pOH `

ANSWER :A::B::C
Discussion
16474.

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

Answer»

weak LIGANDS LIKE `F^(-),Cl^(-) and and OH^(-)` usually form low spin complexes
Strong ligand like `CN^(-)` and `NO_(2)^(-)`, generally form high spin complexes
`[FeF_(6)]^(3-)` is high spin COMPLEX
`[Ni(CO)_(4)]` is high spin complex

Solution :`F^(-),Cl^(-) and OH^(-)` are weak field ligands usually form high spin complexes.
`CN^(-) and NO_(2)^(-)` are strong field ligands usually form low spin complexes.
`[Ni(CO)_(4)]` is low spin complex.
Discussion
16475.

Which one of the following compounds yield phenylhydrazine hydrochloride?

Answer»




`HN_2NH_2` and HCL

SOLUTION :
Discussion
16476.

Which one of the following is NOT used to prepare alkyl halide from an alcohol?

Answer»

`SOCl_(2)`
`PCl_(3)`
`ZnCl_(2)+HCl`
NaCl

Answer :A::C
Discussion
16477.

There is a huge difference between the melting and boiling points of oxygen and sulphur. Why ?

Answer»


SOLUTION :(i) SULPHUR has great catenation property and forms large molecule( `S_(6)` or `S_(8)` ) having high molecular WEIGHT, which results in higher melting point.
(ii) While oxygen exists as diatomicmolecule of less molecular weight, HENCE has very low melting point.
Discussion
16478.

When a lead storage battery is discharged :

Answer»

`SO_2` is evolved
lead SULPHATE is produced at both electrodes
sulphuric acid is consumed
water is formed.

SOLUTION :at anode : ` Pb_s + So_(4(aq))^(-2) + 4H^(+) + 2e^(-) to PbSo_(4(s)) + 2H_(2(l)o)`
overall REACTION : `Pb_s + Pbo_2 + 2H_2SO_(4(aq)) underset("Charging")overset("working")iff 2PbSo_(4(s)) + 2H_(2(l)o)`
Discussion
16479.

Zinc is used to protect iron from corrsion because zinc is

Answer»

more electropositive than iron
CHEAPER than iron
a bluish white metal
a good conductor of heat and ELECTRICITY

SOLUTION :Alkali metals Caesium has lowest melting point . Caesium is a CHEMICAL element with symbol Cs and atomic number 55 . Alkali metals are very reactive , electropositive , monovalent metals forming strongly alkaline hydroxides.
Discussion
16480.

The reagent used to distinguish propanol -1 and propanol-2

Answer»

AMMONIACAL SILVER nitrate
Fehling 's solution
I and NaOH
Schiff'sreagent

Answer :C
Discussion
16481.

Which of the following complexes shows optical isomerism ? (en=ethylenediamine )

Answer»

`CIS[Co(EN)_(2)Cl_(2)]CL`
`trans[Co(en)_(2)Cl_(2)]Cl`
`[Co(NH_(3))_(4)Cl_(2)]Cl`
`[Co(NH_(3))_(3)Cl_(3)]`

ANSWER :A
Discussion
16482.

What is activation energy?

Answer»

Solution :ACTIVATION ENERGY is the extra energy which must be supplied to the reactants so that they change into PRODUCTS .
(i) Catalyst lowers down the activation energy.
There is no EFFECT on activation energy with RISE in temperature but number of molecules possessing activation energy will increase.
Discussion
16483.

Which of the following is the correct order for increasing bond angle ?

Answer»

`Nh_(3) lt PH_(3) lt AsH_(3) lt SbH_(3)`
`H_(2)O lt OF_(2) lt Cl_(2)O`
`H_(2)Te^(+) lt H_(3)Se^(+) lt H_(3)S^(+) lt H_(3)O^(+)`
`BF_(3) lt BCl_(3) lt BBr_(3) lt BI_(3)`

Solution :CORRECT order of bod angle :
(a) `NH_(3) lt PH_(3) lt AsH_(3) lt SbH_(3) ` (As E.N. value of `C.A. UARR` bond angle `darr`)
(b) `OF_(2) lt OH_(2) lt OC l_(2)`
(c ) `H_(3)Te^(+) lt H_(3)Se^(+) lt H_(3)S^(+) lt H_(3)O^(+)`
(d) `BF_(3)=BCl_(3)=BBr_(3)=BI_(3)`
Discussion
16484.

The substance that is used to modify physiological system for the benefit of the recipient is called .........

Answer»

a DRUG
a dye
a FOOD preservative
soap

Solution : a drug
Discussion
16485.

What is the total volume of atom present in body centered unit cell having edge length 69.3 pm ?

Answer»

`2.26 xx 10^(4) "pm"^(3)`
`2.26 xx 10^5 "pm"^3`
`1.13 xx 10^6 "pm"^3`
`1.13 xx 10^(5) "pm"^3`

Solution :For bcc lattice `R = (sqrt(3))/4 a`
`r = (sqrt3)/(4) xx69.3` = 30 pm
`THEREFORE` Volume of total atoms of CUBE ` 8/3 pi r^3`
`= 8/3 xx 22/7 (30)^(3)`
`= 2.26 xx 10^(5) "pm"^3`.
Discussion
16486.

Which of the following statements regarding copper salte is not true :

Answer»

Copprer (I) disproportionates into CU and Cu (II) in aqueous solution
Copper (I) can be STABILISED by the formation of INSOLUBLE complex compound such as `CuCl_2^-` and `Cu(CN)_2^-`
Copper (II) oxide is red powder
Hydratd `CuSO_4` is `[Cu(H_2O)_4]SO_4H_2O`

ANSWER :C
Discussion
16487.

Which reagent will you use for the following reaction. CH_3CH_2CH_2CH_3 rarrCH_3CH_2CH_2CH_2Cl+CH_3CH_2CHClCH_3

Answer»

`Cl_2//UV` light
`NaCl+H_2SO_4`
`Cl_2` GAS in dark
`Cl_2` GA in the presence of IRON in dark

SOLUTION :`Cl_2//UV` (light ), reaction free radical SUBSTITUTION
Discussion
16488.

Who discovered the nucleophilic substitution reaction for synthesis of unsymmetrical ethens?

Answer»

Williamson's
Grignard
Hofmann
Nernst

Solution :Williamson.s
Discussion
16489.

Which one of the following is a polyhdrocarbon ?

Answer»

STARCH
NATURAL rubber
Casein
TERYLENE

ANSWER :B
Discussion
16490.

What volume of methane is formed from 8.2 g of sodium acetate by fusion with soda lime?

Answer»

2.24 litre
11.2 litre
5.6 litre
10 litre

Answer :A
Discussion
16491.

Which of the following pairs represents anomers-

Answer»




Solution :ANOMERS differ in the configuration of only the anomeric CARBON, i.e., C-1 of ALDOSES and C-2 of KETOSES
Discussion
16492.

Which of the following halogens has metallic character ?

Answer»

`F_(2)` <BR>`CI_(2)`
`Br_(2)`
`I_(2)`

ANSWER :D
Discussion
16493.

What is meant by central action in complex salt?

Answer»

Solution :The central atom / ion is the one that occupies the central POSITION in a COORDINATION entity and BINDS other atoms or group of atoms (ligands) to itself, through a coordinate covalent BOND.
For e.g, In `K_(4)[Fe(CN)_(6)]` the central metal ion is `Fe^(2+)`
Discussion
16494.

Which is incorrect for bleaching powder:

Answer»

HIGHLY insoluble in water
Light yellow coloured powder
Oxidising agent
Reacts with DILUTE ACID to RELEASE chlorine

Answer :A
Discussion
16495.

The vapour pressures of ethanol and methanol are 42.0 mm and 88.5 mm Hg respectively. An ideal solution is formed at the same temperature by mixing46.0 g of ethanol with 16.0 g of methanol. The mole fraction of methanol in the vapour is:

Answer»

0.467
0.502
0.513
0.556

Answer :C
Discussion
16496.

Which statement about hybridization in the following is not correct ?

Answer»

Hybridization is the mixing of ATOMIC ORBITALS prior to their COMBINING into molecular orbitals
`sp^2` hydbrid orbitals are formed from two p atomic orbitals and one S atomic orbital
`d^2sp^3` HYBRID orbitals are DIRECTED towards the corners of a regular octahedron
`sp^3d`hybridd orbitals are all at `90^@` to one another

Answer :D
Discussion
16497.

What is the oxidation number of Fe in [Fe(H_(2)O)_(5)(NO)]^(2+) ion?

Answer»

`+2`
`+3`
`+1`
`0`

Answer :C
Discussion
16498.

What is meant by conjugate acid base pair? Find the conjugate acid l base for the following species: HNO_2,CH^(-),HClO_4,OH^(-),CO_3^(2-),S^(2-)

Answer»

Solution :An acid base pair which DIFFERS by a proton only `(Ha leftrightarrow A^(-)+H^+)` is known as CONJUGATE acid-base pair.
Conjugate acid : `HCN,N_2O,HCO_3^(-),HS^(-)`
Conjugate base `NO_2^(-),ClO_4^(-),O_2^(-)`
Discussion
16499.

Which of the following facts regarding the movement of anions in the solution is incorrect ?

Answer»

Towards CATHODE in an electrolyte cell and towards anode in a GALVANIC cell .
Towards anode in an electrolytic cell and towards cathode in a galvanic cell.
Towards cathode in both TYPE CELLS.
Towards anode in both type cells.

SOLUTION :Towards cathode is an electrolytic cell , Towards anode in a galvanic cell
Towards anode in an electrolytic cell , towards cathode in a galvanic cell Towards cathode in both type cells
Discussion
16500.

x g of KHC_(2)O_(4) requires 100 ml of 0.02 M–K MnO_(4) in acidic medium. In another experiment, y g of KHC_(2)O_(4) requires 100 ml of 0.05 M-Ca(OH)_(2) . The ratio of x and y is

Answer»

`1:1`
`1:2`
`2:1`
`5:4`

Solution :`n_(eq)KHC_(2)O_(4) = n_(eq) KMnO_(4)` or
`x/M xx 2 = (100 xx 0.2)/(1000) xx 5`
`n_(eq)KHC_(2)O_(4) = n_(eq)CA(OH)_(2)`
or. `y/M xx 1 = (100 xx 0.5)/1000 xx 2`
`:. x/y = 1/2`.
Discussion