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21901.

Which of the following is /are correct ?

Answer»

During mono nitration of BENZENE with conc. `H_(2)SO_(4)` and conc. `HNO_(3)` temperature should not be ALLOWED to exceed `60^(@)C`
In nitrating mixture `(HNO_(3)+H_(2)SO_(4)), HNO_(3)` acts as base
Electrophilic substitution in aromatic compounds involves arenium ion
Nitrogen and `H_(2)SO_(4)` can be used an nitrating mixture

Solution :`(HNO_(3)+H_(2)SO_(4))` mixture is nitration miixture
Discussion
21902.

Which one is the best colligative property for determination of molecular mass of polymer?

Answer»

OSMOTIC pressure
ELEVATION in boiling point
DEPRESSION in freezing point
osmosis

Answer :A
Discussion
21903.

What are the chemical twins ? Write 'two ' examples

Answer»

Solution :A pair of elements having similar properties due to similar atomic radii and number of valence electrons are CALLED chemical twins . They are d - block elements of 5th and 6th [PERIOD of 4d - series and5d -series respectively .
Exampleis Zr and HF, Nb and Ta, MO and W, TC and Re are pair of chemical twin elements .
Discussion
21904.

Write the IUPAC name of following coordinate compounds.[PtCl_2(NH_3)_2]

Answer»

SOLUTION :Dichlorodiammine PLATINUM (II)
Discussion
21905.

Which of the following is not favouble condition for physical adsorption?

Answer»

HIGH pressure
Negative `DELTAH`
HIGHER CRITICAL TEMPERATURE of adsorbate
High temperature

Answer :D
Discussion
21906.

Which of the following is called calomal ?

Answer»

`Hg_2Cl_2`
`HG(NO_3)_2`
`HgCl_2`
`HgSO_4`

SOLUTION :`Hg_2Cl_2` is CALOMEL
Discussion
21907.

Which one of the following is a condensation polymer?

Answer»

PVC
Teflon
DACRON
Polystyrene

Solution :Dacron is a CONDENSATION POLYMER
Discussion
21908.

Two moles of an ideal gas is expanded isothermally and reversible from 1 L to 10 L at 300 K. The enthalpy change (in kJ) for the process is

Answer»

11.4 KJ
`- 11.4 kJ`
0 kJ
4.8 kJ

Answer :C
Discussion
21909.

When three molecules of acetone condense in presence of dry CHl, the product formed is :

Answer»

mesityl oxide
glyoxal
mesitylene
phorone

Answer :D
Discussion
21910.

Which of the following set do not have sp^(3)dhybridization :-

Answer»

`PF_(4)^(-) & BrF_(3)`
`I Cl_(2)^(+) & SF_(4)`
`XeF_(2) & I_(3)^(-)`
`AsF_(4)^(-) & SCl_(4)`

ANSWER :B
Discussion
21911.

Which substance is used as a poison for rats?

Answer»

SOLUTION :SODIUM FLUORIDE
Discussion
21912.

The root mean square speed of the molecules of diatomic gas is u. When the temperature is doubled, the molecules dissociates into two atoms. The new rms speed of the atom is :

Answer»

`SQRT2 U`
u
2 u
4u

Answer :C
Discussion
21913.

Which of the following graphs regarding Maxwell distribution of speed are correct for ideal gases ?

Answer»




ANSWER :A::B
Discussion
21914.

When Al is added to potassium hydroxide solution :

Answer»

No REACTION TAKES place
Oxygen is evolved
Water is produced
Hydrogen is evolved

Answer :D
Discussion
21915.

Which of the following are the advantages of using oxygen in place of air in steel industry a) It gives more pure product b) The surface is free from nitrides c) Itmakes procedure faster, that is more product on d) Larger quantities can be handled

Answer»

a,B,C
b & d only
b,c,d
a,b,c,d

Answer :D
Discussion
21916.

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)gtT_(1))

Answer»

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

ANSWER :B
Discussion
21917.

Which of the following compounds will have the highest dipole moment ?

Answer»




ANSWER :D
Discussion
21918.

Which element has highest second ionisation enthalpy?

Answer»

SOLUTION :LITHIUM
Discussion
21919.

Which of these is the weakest base?

Answer»

`NaOH`
KOH
`Ca(OH)_(2)`
`Zn(OH)_(2)`

ANSWER :D
Discussion
21920.

Which one has ability for prevention of impregnation ?

Answer»

Estrogen
Progesterone
(A) and (B) both
Testosterone 

SOLUTION :(A) and (B) both
Discussion
21921.

Which of the following is Lewis acid

Answer»

S
`:CH_(2)`
`(CH_(3))_(3)B`
All of these

Solution :ACCEPTOR of electron pair is KNOWN as LEWIS acid. S, : `CH_(2), (CH_(3))_(3)B` all can accept an electron pair of answer is (d).
Discussion
21922.

Which of the following is not a biodegradable polymer?

Answer»

Polyhydroxy butyrate -CO-`beta`-HYDROXY valerate
PHBV
NYLON 2-Nylon-6
Glyptal

Solution :Glyptol is not a biodegradable POLYMER. The common EXAMPLE of aliphatic biodegradable polymers are polyhydroxy butyrates CO-beta hydroxyl valerate (PHBV), nylon-2- nylon-6 etc.
Discussion
21923.

What is the potential of half-cell consisting of zinc electrode in 0.01 M ZnSO_(4) solution at 25^(@)C(E_(o x)^(@)=0.763V)

Answer»

0.8221 V
8.221 V
0.5282 V
9.282 V

Answer :A
Discussion
21924.

What type of isomerism is shown by the complex [Co(NH_(3))_(6)][Cr(CN)_(6)] ?

Answer»

Solution :`[CO(NH_(3))_(6)][CR(CN)_(6)]` EXHIBITS COORDINATION isomerism.
Discussion
21925.

When a graph is plotted between log x/mand log p, it is straight line with an angle 45^@ and intercept 0.6020 on y-axis.if initial pressure is 0.3 atm, what will be the amount of gas adsorbed per gram of adsorbent :

Answer»

<P>0.4
1.2
0.8
0.1

Solution :`"LOG" x/M="log K"+1/n "log P"`
`1/n=tan 45^@ " " "log K" =0.6020`
n=1 k=4
`x/m=4xx(0.3)^1=1.2`
Discussion
21926.

The two complexes of nickel, [Ni(CN)_(4)]^(2-) and [Ni(CO)_(4)] have different structures but posses same magnetic behaviour. Explain.

Answer»

Solution :In `[Ni(CN)_(4)]^(2-)`, Ni is in +2 state. Hybridisation is `dsp^(2)`. Structure is square PLANAR. All electrons are paired. Hence, it is DIAMAGNETIC.
In `[Ni(CO)_(4)]`, Ni is in '0' state. Hybridisation is `SP^(3)`. Hence, structure is DIFFERENT (tetrahedral). All electrons are paired. Hence, it is also diamagnetic.
Discussion
21927.

The standard oxidation potentials of the elements M_(1),M_(2) and M_(3) are +0.34V , +3.05 V and +1.66V respectively. The order of their reducing strength wil be

Answer»

`M_(1)gtM_(3)gtM_(2)`
`M_(1)gtM_(2)gtM_(3)`
`M_(2)gtM_(3)gtM_(1)`
`M_(3)gtM_(2)gtM_(1)`

Solution :Application of EMF SERIES.
Discussion
21928.

Why are artificial sweetening agents harmless when taken ?

Answer»

SOLUTION :Because they are not metabolized by body and excreted from the bodyin URINE UNCHANGED.
Discussion
21929.

Which of the following pair of transition elements exhibit highest and lowest density?

Answer»

OS and Sc
Os and Pt
Hg and Sc
Os and IR

ANSWER :A
Discussion
21930.

What is the order of isomerisation of cyclopropane to propene ?

Answer»

1.5
`3//2`
`5//2`
1

Answer :D
Discussion
21931.

Which of the following compound form non conducting solution in water. :-

Answer»

Blue vitriol
Toulene
Chili SALT petre
Indian salt petre

Solution :ALCOHOL form H-bond with `H_(2)O`
Discussion
21932.

Vinegar is

Answer»

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

Solution :VINEGAR is the diluted solution of acetic ACID `(CH_(3)COOH)`. It is formed by the fermentation of ethyl ALCOHOL in the PRESENCE of bacteria ACETOBACTER.
Discussion
21933.

Write the structural formulae of (a) a dibasic acid, (b) a polyhydric alcohol and (c) and acid chloride. Name them according to IUPAC system.

Answer»
Discussion
21934.

Which statement about ribose is incorrect :

Answer»

A polyhydroxy compound
An ALDEHYDE sugar
Has SIX carbon ATOMS
EXHIBITS optical activity

Answer :C
Discussion
21935.

The relation between atomic radius ( r ) and edge length ( a ) a face - centred cubic cell is

Answer»

`R = a/2`
`r = a/(2sqrt2)`
`r = (a SQRT3)/4`
`(sqrt2a)/2`

Answer :B
Discussion
21936.

Which of the following complexes is/are tetrahedral ?

Answer»

`[PtBr_(4)]^(2-)`
`[AuCl_(4)]^(-)`
`[Ni(CO)_(4)]`
`[NiCl_(2)(PPh_(3))_(2)]`

SOLUTION :
Discussion
21937.

Which has maximum number of atoms?

Answer»

24 g of C
56 g of Fe(56)
27 g of Al(27)
108 of AG (108)

SOLUTION :24 g `C = 24/12` MOL `=2 mol = 2 xx N_(0)` atoms
56 g Fe `=56/56 mol = 1mol = N_(0)` atoms
27 g Al `=27/27 mol =1 mol = N_(0)` atoms
108 g Ag `=108/108 mol = 1 mol = N_(0)` atoms.
Discussion
21938.

The strongest base in aqueous solution among the following amines is

Answer»

N, N-diethylethanamine
N-ethylethanamine
N-methylmethanamine
ethanamine

Answer :B
Discussion
21939.

The unit for the electric current is

Answer»

Ohm
Volt
Ampere
Coulomb

Answer :C
Discussion
21940.

Which hydrocarbon ismainly presentin gobar gas?

Answer»

Butane
Proane
METHANE
ETHANE

ANSWER :C
Discussion
21941.

When pent-wyne is treated with H_(2)O//H^(+) Hg^(2+) the products formed are

Answer»

`CH_(3)COCH_(2)CH_(2)CH_(3)`
`CH_(3)CH_(2)COCH_(2)CH_(3)`
`CH_(3)CH_(2)CH_(2)COOH+HCOON`
`CH_(3)CH_(2)CH_(2)COOH`

SOLUTION :
Discussion
21942.

What are the different categories of crystalline solids ?

Answer»

Solution :MOLECULAR, IONIC, METALLIC and COVALENT SOLIDS.
Discussion
21943.

The standard potential of the cell is related to standard Gibb's energy as_________

Answer»

SOLUTION :`Delta_(R)G^(@) =-NFE^(@)`
Discussion
21944.

Which one of the following is the correct statement ? The force binding the nucleons inside the nucleus is:

Answer»

charge dependent
strong and HIGHLY repulsive
a CENTRAL force
charge independent

Solution :Nuclear forces between PROTONS and protons between neutrons and neutrons and between protons and neutrons are all ESSENTIALLY the same in magnitude. Thus, we can say that nuclear forces are charge indeoendent.
Discussion
21945.

Which of statements are true?

Answer»

`NaHCO_(3) and KHCO_(3)` have same CRYSTAL structure
On heating `LiNO_(3)` decomposes into `Li_(2)O an CO_(2)`
Among ALKALI metals, Li metal impart red COLOUR flame
`Li_(2)SO_(4)` does not FORM alum

Answer :B::D
Discussion
21946.

Whichof thefollwingis lessbaiscinaqueousmediumis

Answer»




Solution :Electronwithdrawinggroupdecreasethe basicityof AMINES . Strongelectron WITHDRAWING goups DECREASE more basicityof amines .
`NO_(2)`isstrongwithdrawinggroup thanCl andOH.
Discussion
21947.

Which of the following is not an ore of magnesium ?

Answer»

CARNALLITE
dolomite
calamine
sea WATER

Solution :Carnallite `(KCl.MgCl_(2).6H_(2)O)`, dolomite `(MgCO_(3).CaCO_(3))`, sea water all are ORES of magnesium.
Calamine `(ZnCO_(3))` is an ore of zinc.
Discussion
21948.

What is the general characteristic property of transitionelements?

Answer»

PARAMAGNETISM
Diamagnetism
Salt resistant
None of the above

Answer :A
Discussion
21949.

Which of the following upon treatment with tert-BuONa followed by addition of bromine water, fails to decolourize the colour of bromine ?

Answer»




Solution :Alkene can not PRODUCED t-BuONa,with so, it UNABLE to MAKE BROMINE water decolourized.
Discussion
21950.

Which ion has the highest spin magnetic moment value ?

Answer»

`[Cr(H_(2)O)_(6)]^(3+)`
`[FE(H_(2)O)_(6)]^(2+)`
`[Zn(H_(2)O)_(6)]^(2+)`
`[CO(NH_(3))_(6)]^(3+)`

Answer :B
Discussion