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4951.

Which of the following compounds give iodoform on reaction with I_2 & NaOH

Answer»

`ICH_2COCH_2CH_3`
`ICH_2CH_2COCH_2CH_3`
`CH_3CH_2 -undersetoverset(|)(OH)(C )H - CH_3`

SOLUTION :
Discussion
4952.

What is the formula of the compound formed by elements X and Y if atoms of element Y are in hcp arrangement and those of the element X occupy 2//3rd of tetrahedral voids?

Answer»


Solution : Number of tetrahedral voids FORMED is equal to TWICE the number of atoms of ELEMENT Y and only `2/3` rd of these are OCCUPIED by the atoms of X. Hence the ratio of the atoms of X and Y is `2 x 2/3 : 1` or 4:3
`:.` Formula of the compound is `X_4Y_3`.
Discussion
4953.

The total number of crystal forms possible is around

Answer»

32
14
230
7

Answer :C
Discussion
4954.

Which of following hormone is produced by testis ?

Answer»

Progesterone
Estradiol
Testosterone
Estrone 

ANSWER :C
Discussion
4955.

The size of Pb,Pb^(2+)and Pb^(4+) decreases in the order:

Answer»

`Pb^(4+)gtPb^(2+)gtPb`
`PbgtPb^(4+)gtPb^(2+)`
`Pb^(4+)gtPb gt Pb^(2+)`
`Pbgt Pb^(2+)gt Pb^(4+)`

Answer :B
Discussion
4956.

Which method of purification is represented by the following equations ? Ti(s) +2I_2(g) overset(523K)rarrTil_4(g)overset(1700K)rarrTi(s)+2I_2(g)

Answer»

VAN Arkel
Zone REFINING
CUPELLATION
Poling

Solution :It is Van Arkel METHOD .
Discussion
4957.

The souce of nitrogen in Gabriel synthesis of amines is

Answer»

SODIUM azide `(NaN_3)`
Sodium nitrite `(NaNO_2)`
Potassium CYANIDE (KCN)
Potassium phthalimide `[C_6 H_4 (CO)_2N^(-) K^(+)]`

Solution :`C_6 H_4 (CO_2 ) N^(-) K^(+)`
Discussion
4958.

The spin only magnetic moment of [MnBr_(4)]^(2)- is 5.9 BM. Predict the geometry of the complex ion.

Answer»

Solution :Since the coordination number of `Mn^(2+)` ion in the complex is 4, it will be EITHER TETRAHEDRAL `(sp^(3))` or square planar `(dsp^(2))`. But the fact that magnetic MOMENT of the complex is 5.9 BM, it should be tetrahedral in shape rather than square planar because of the presence of FIVE UNPAIRED electrons in d-orbitals.
Discussion
4959.

Which one of the following is employed as a tranquillizer drug ?

Answer»

Promethazine
Valium
Naproxen
Mifepristone 

ANSWER :B
Discussion
4960.

What is the average molecular mass of drugs?

Answer»

Solution :Drugs are the chemicals of low molecular masses i.e. `(-100-500u)`. They interact with macromolecular TARGETS and produce a biological response, when the biological response is THERAPEUTIC and useful, these CHEMICAL are CALLED medicines.
Discussion
4961.

Which statement is NOT TRUE for describing enzymes.

Answer»

They are polypeptides
There are glycosidic linkages between the molecules
They are specific for a particular REACTION
They CATALYZE BIOLOGICAL REACTIONS.

Answer :B
Discussion
4962.

Which of the following statements regarding Ni and Pt are correct

Answer»

`Ni^(2+)` is more STABLE than `PT^(2+)`
`Pt^(4+)` is more stable then `Ni^(4+)`
Pt does not from amalgums
both are used in hydrogenation

Solution :wiht increase is n VALUE stability of HIGHER 0.5 incrases
Discussion
4963.

To neutralise 20 ml of M/10 NaOH the volume of M/20 HCl needed is :

Answer»

10 ml
30 ml
40 ml
20 ml

Answer :C
Discussion
4964.

Which of the following compounds will give a ketone on oxidation at room temperature :

Answer»

`(CH_3)_3COH`
`CH_3CH_2CH_2OH`
`CH_3CH_2CH(OH)CH_3`
`(CH_3)_2CHCH_2OH`

ANSWER :C
Discussion
4965.

Which oxide of nitrogen is isoelectronic with CO_2?

Answer»

`NO_2 `
`N_2O`
NO
`N_2O_2 `

ANSWER :B
Discussion
4966.

When an electrolyte is added to a colloidal sol it

Answer»

GETS coagulated
Is ionised
BECOMES STABLE
Gets purified

Answer :A
Discussion
4967.

When phenyl magnesium bromide reacts with tert-butanol, which of the following product is formed?

Answer»

tert-Butyl METHYL ether
Benzene
tert-Butyl benzene
Phenol

ANSWER :B
Discussion
4968.

Which one of the following is a symmetrical ether ?

Answer»

`CH_(3)-O-CH_(3)`
`C_(2)H_(5)O-C_(2)H_(5)`

All of these

Solution :All of these
Discussion
4969.

Which of the following structures of a molecule is expected to have three bond pairs and one lone pair of electrons?

Answer»

Trigonal Planar
Tetrahedral
Octahedral
Pyramidal

Solution :A molecule with three BOND pairs and ONE lone pair of ELECTRONS like `NH_(3)`, is `sp^(3)` hybridised with tetrahedral geometry and trigonal pyramidal STRUCTURE.
Discussion
4970.

Which is not an ore of iron ?

Answer»

Haematite
Magnetite
Cassiterite
Limonite

Answer :C
Discussion
4971.

Which of the following compounds is expected to be coloured :

Answer»

`Ag_2SO_4`
`CuF_2`
`MgF_2`
CuCl

Answer :B
Discussion
4972.

The standard enthalpy of formation of NH_(3) is -46.0kJmol^(1-).If the enthalpy of formation of H_(2) from its atoms is - 436 kJ mol^(-1) and that of N2 is - 712 kJ mol^(-1), the average bond enthalpy of N - H bond in NH_(3) is

Answer»

`-1102 kJ mol^(-1)`
`-964 kJ mol^(-1)`
`+352 kJ mol^(-1)`
`+1056 kJ mol^(-1)`

Solution :`(1)/(2)N_(2)+(3)/(2)H_(2)rarrNH_(3)`
`DeltaH=H_(F)(NH_(3))-(1)/(2)H_(f)(N_(2))-(3)/(2)H_(f)(H_(2))`
`-46=H_(f)(NH_(3))-(1)/(2)(-712)-(3)/(2)xx(-436)`
`H_(f)(NH_(3))=-46-356-654=-1056 KJ`enthalpy of formation of `NH_(3)`=-1056 KJ
Average BOND enthalpy of N - H bond
`= (1056)/(2)=352`
Discussion
4973.

Which of the following is not hydrolysed?

Answer»

`AsCl_(3)`
`PF_(3)`
`SbCl_(3)`
`NF_(3)`

Solution :NEITHER N nor F have d-orbitals to accept electrons donated by `H_(2)O` for hydrolysis.
Discussion
4974.

When 2-ethylanthraquinol dissolved in a mixture of benzene and cyclohexanol is oxidised , the product is

Answer»

Ethanol
Hydrogen peroxide
Anthracene
None of above

Answer :A
Discussion
4975.

Which will not produce HCHO on periodic cleavage ?

Answer»

Sucrose
Fructose
Saccharic acid
Gluconic acid

Solution :N//A
Discussion
4976.

What is the temperature at which average K.E. of an ideal gas molecule is 1 eV.

Answer»


ANSWER :11594 K
Discussion
4977.

x g of glucose was dissolved in 500 g water and cooled upto -0.25^(@)C, due to which 128 g of ice is seperated out from the solution.Then the value of x is ("Given" : K_(f)(H_(2)O)=1.86K.kg "mol"^(-1))

Answer»

6
9
12
18

Solution :
Discussion
4978.

Which is not a mineral?

Answer»

Mica
Peat
Quartz
Felspar

Answer :B
Discussion
4979.

The solubility of BaSO_4 in water is 0.00233 g per litre at 30^@C . The solubility of BaSO_4 in 0.1M (NH_4)_2SO_4 solution at the same temperature is :

Answer»

`10^(-5)` mol/lit
`10^(-6)` mol/lit
`10^(-8)` mol/lit
`10^(-9)` mol/lit

Answer :D
Discussion
4980.

Ti^(3+) is purple but Ti^(4+) is colourless. This is because

Answer»

`d^1` CONFIGURATION of `TI^(3+)`
`d^(@)` configuration of `Ti^(3+)`
`d^3` configuration of `Ti^(3+)`
`d^(10)` configuration of `Ti^(3+)`

SOLUTION :`d^1` configuration of `Ti^(3+)`
Discussion
4981.

Which is universally correct for the catalyst ?

Answer»

INITIATES reaction
Does not initiate reaction
Does not ALTER the nature of products
Is not specific in nature

Answer :B
Discussion
4982.

Which reagent stops the alcohol at aldehyde stage ?

Answer»

PCC
`H_(2)CrO_(4)`
`KMnO_(4)`
All of these

Solution :PCC
Discussion
4983.

Which of the following metals forms its amide when NH_(3) is passed over the metal at 300^(@)C ?

Answer»

Lead
Potassium
Magnesium
Zinc

Answer :B
Discussion
4984.

What is ozonolysis ?

Answer»

Solution :The REACTION of OZONE with unsaturated hydrocarbons FOLLOWED by hydrolysis with water in presence of zinc is called ozonolysis and can be used to ESTABLISH the structure of ALKENES.
Discussion
4985.

The sulphur oxide SO_(2), can acts as

Answer»

Reducing agent
oxidising agent
bleaching agent
LEWI's BASE

SOLUTION :So `SO_(2)` act as reducing agent
So `SO_(2)` act as oxidising agent
c) `SO_(2)+2H_(2)O H_(2)SO_(4)+2H`. In the presence of moisture `SO_(2)` acts as a bleaching agent. It is due to its reducing nature
d) Molecule having multiple bonds between ATOMS dissionilar electro-negativities.
Discussion
4986.

There are some deposits of nitrates and phosphates in earth's crust. Nitrates are more soluble in water. Nitrates are difficult to reduce under the laboratory conditions but microbes do it easily. Ammonia forms large number of complexes with transition metal ions. hybridization easily explains the ease of sigma donation capability of NH_(3) and PH_(3). phosphine is a flammable gas and is prepared from white phosphorous. Among the following, the correct statements is

Answer»

PHOSPHATES have no biological significance in humans
Between nitrates and phosphates, phosphates are less abundant in EARTH's crust
Between nitrates and phosphates, phosphates are less in earth's crust
Oxidation of nitrates is possible in soil

Solution :Nitrates are more soluble in WATER and so less abundant in earth crust.
Discussion
4987.

There are some deposits of nitrated and phosphates in the earth's crust. Nitrates are more soluble in water. Nitrates are difficult to reduce under laboratory conditions but microbes do it easily. Ammonia forms a large number of complexes with transition metal ions. Hybridisation easily explains the ease of sigma donation capability of NH_3 and PH_3. Phosphine is a flammable gas and is prepared from white phosphorous. Which of the following statement is correct ?

Answer»

Between `NH_(3)` and `PH_(3),NH_(3)` is a better electron donor ORBITAL and is less DIRECTIONAL
Between `NH_(3)` and `PH_(3),PH_(3)` is a better electron occupies `sp^(3)` orbitals and is more directional
Between `NH_(3)` and `PH_(3),NH_(3)` is a better electron donor because the lone pair of electron occupies `sp^(3)` orbital and is more directional
Between `NH_(3)` and `PH_(3),PH_(3)` is a better electron dono because the lone pair of electron occupies SPHERICAL 's' orbital and is less directional

Solution :Hybridised orbital are prominent in bonding due to `sp^(3)` HYBRID orbital have more directional CHARACTER than s-orbital.
Discussion
4988.

What are the differences between soft and hard soap ?

Answer»

SOLUTION :(i) Soft SOAP is potassium salt of higher fatty acid while HARD soap is sodium salt of higher fatty acid.
(ii) Hard soap is MODERATELY soluable in water while soft soap is easily soluable in water.
(iii) cleansing action of soft soap is BETTER than hard soap.
Discussion
4989.

Which of the following forms a colloidal solution with water?

Answer»

NaCl
Glucose
STARCH
Barium sulphate

Solution :Starch
Discussion
4990.

Thevalue ofDelta _fG^(@)for formationofCr_2O _ 3is-540kJ mol^(-1)andthat ofAl_2O _ 3is- 827 kJ mol ^( - 1).Is thereductionofCr_2O _ 3possiblewithaluminium ?

Answer»

Solution :Thetwoequationsare :
`( 4 )/(3)Al (s)+O _ 2(g) to(2)/(3)Al_ 2O _ 3 (s),Delta_fG_(Al, Al_2O_3) ^(@) =- 827 KJ mol^(- 1) "" `… (i)
` (4)/(3)Cr (s)+O _2(g) to(2)/(3)Cr_ 2O _ 3(s) ,Delta_ FG^(@)=- 540 kJmol^(-1) "" `...(ii)
SubtractingEq. (ii) fromEq.(i),we have,
` (4)/(3) Al(s) +(2)/(3)Cr _2O_ 3(s)to( 2) /(3) Al _2O_ 3(s)+(4)/(3) Cr(s) ,Delta_ rG^(@) =-287 kJmol^(- 1 ) `
SINCE`Delta _r G^(@) `ofthecombinedredoxreactionis`- ve`,THEREFORE, reductionof` Cr_ 2O_3`byAl ispossible.
Discussion
4991.

Which of the following halogens has the highest meltingpoint ?

Answer»

`F_2`
`Cl_2`
`Br_2`
`I_2`

SOLUTION :M.P./B.P. increases down the group `I_2` being solid SHOWS HIGHEST M.P.
Discussion
4992.

Which of the following is/are incorrect statements(s) for phosphine ?

Answer»

It is LESS basic then `NH_(3)`
It is less poisonous than `NH_(3)`
The solution of COPPER sulphate given no precipitate with `PH_(3)`
PHOSPHINE burns in air forming PREDOMINANTLY `H_(3)PO_(4)`

Answer :B::C::D
Discussion
4993.

When the pure solvent diffuses out of the solution through the semi-permeable membrane then the process is called

Answer»

Osmosis
Reverse osmosis
Sorption
Dialysis

SOLUTION :The EXCESS pressure WICH must be applied to solution to prevent the PASSAGE of solvent it through a semipermeable MEMBRANE.
Discussion
4994.

Write the IUPAC name of the C_6 H_5- O - C_2 H_5

Answer»

SOLUTION :ETHOXY BENZENE
Discussion
4995.

THF is treated with excess of HBr at 373K. The product is

Answer»

1,4-Dibromobutane
1-Bromo-2-butane
4-Bromo-1-butanol
4-Bromo-1-butane.

SOLUTION :
Discussion
4996.

Whenhydrogen peroxide is added to an acidified solution of a dichromate gives a deep blue coloured compound 'A' in presence of organic solvent, which decomposes rapidly in aqueous solution into 'B' and dioxygen. Compound 'A' can be extracted by dimethyl ether forming the adduct 'C'. The oxidation state of the metal ion in compound 'A' are

Answer»

`3+`
`10+`
`6+`
`4+`

SOLUTION :`{:(H_(2)O_(2)+K_(2)Cr_(2)O_(7)+H_(2)SO_(7)),(""darr),(""K_(2)SO_(4)+Cr_(2)(SO_(4))_(3)+CrO_(5)+H_(2)O),("""deepbla"):}`

`CrO_(5)OVERSET(Delta)(to)Cr_(2)O_(3)+O_(5)`
`""CR=4s^(1)3d^(5),Cr^(+3)to4s^(@)3d^(3)`
`overset(+3)(Cr_(2)O_(3))to` no. of unpaired electron is `3`.
Discussion
4997.

What are the end products of respiration:

Answer»

GLUCOSE`+CO_2`
Glucose `+O_2`
`H_2O+CO_2`
`CO_2+O_2`

ANSWER :C
Discussion
4998.

Whenhydrogen peroxide is added to an acidified solution of a dichromate gives a deep blue coloured compound 'A' in presence of organic solvent, which decomposes rapidly in aqueous solution into 'B' and dioxygen. Compound 'A' can be extracted by dimethyl ether forming the adduct 'C'. The magnetic moment of compound 'B' is:

Answer»

`2.8 B.M`
`4.9 B.M`
`0`
`3.8 B.M`

SOLUTION :N//A
Discussion
4999.

Which occur(s) free in nature?

Answer»

<P>`I_(2)`
S
P
O

Solution :All are occur free in NATURE.
Discussion
5000.

What is zwitter ion ? Write zwitter ion structure of Alanine.

Answer»

Solution :DIPOLAR ion or INTERNAL salt.
OR
It is the dipolar ion formed due to transfer of proton (H+) from - COOH GROUP to - `NH_(2)` group in an AMINO acid.
`H_(3)N^(+)-overset(CH_(3))overset(|)(CH)-COO^(-)`
Discussion