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11701.

Write the IUPAC name of (CH_(3)CH_(2))_(2)NCH_(3) :

Answer»

SOLUTION :N-Ethyl-N-Methylethane.
Discussion
11702.

When hydrochloric acid gas is treated with propene in presence of benzoyl peroxide, it gives

Answer»

2-Chloropropane
Allyl chloride
No reaction
n-Propyl chloride.

Answer :A
Discussion
11703.

What is plane polarized light?

Answer»

SOLUTION :A beam of LIGHT which has vibrations in only one plane is called plane POLARISED light.
Discussion
11704.

Which of the following are doubly magic ?

Answer»

`""_(2) ^(4) He`
`""_(8)^(16) O`
`""_(82)^(208)Pb`
`""_(92)^(238)U`

Solution :Magic no. of .Z. & .n. is in `Pb_(82)^(208)`
Discussion
11705.

Which of the following compounds are soluble in NaHCO_(3)?

Answer»

PICRIC acid


Solution :ABD FACTS
Discussion
11706.

Three vapour pressure curves for the same non-volatile solute in the same solvent are shown. The curves are parallel to each other and do not intersect. What is the correct order of the concertrations of the solutions ?

Answer»

Solution :
The correct order of the concerntrations of the solutions : `(I)lt(II)lt(III).`As the concertration of the non-volatilesolute in a particular solvert increases, the vapour pressure of the solution DECRESES because bolute has hardly any urge to change into the vapours. The BOILING POINT of the solution increases. The same BEHAVIOUR has been DEPICTED in the three curves.
Discussion
11707.

What is the SI unit of specific conductivity ?

Answer»

`Sm^(2)`
`Sm^(-2)`
`Sm^(-1)`
`Sm^(3)`

SOLUTION :Specific CONDUCTIVITY
`=(1)/("resistivity")`
=conductivity `(alpha)xx`CELL constant
SI UNIT of conduction is SIMENS (S).
So, SI unit of specific conductivity is `Sm^(-1)` or `Scm^(-1)`.
Discussion
11708.

Which of the following process results in emission of X-rays ?

Answer»

`BETA`-emission
positron-emission
K- ELECTRON CAPTURE
`ALPHA`-emission

Answer :C
Discussion
11709.

Which is the most abundant metal in earth's crust?

Answer»

SOLUTION :ALUMINIUM.
Discussion
11710.

When compound X is oxidised by acidified potassium dichromate, compound Y is formed. Compound Y on reduction with LiAIH_(4)gives X.X and Y respectively are

Answer»

` C_2H_5OH , CH_3COOH`
` CH_3COCH_3,CH_3COOH`
` C_2H_5OH,CH_3,COCH_3`
` CH_3,CHO,CH_3COOH`

ANSWER :A
Discussion
11711.

Which has the maximum dipole moment ?

Answer»




SOLUTION :SEE A-Level INFORMATION.
Discussion
11712.

Which of the following is used in the preparation of chlorine ?

Answer»

Only `MnO_(2)`
Only `KMnO_(4)`
Both `MnO_(2)andKMnO_(4)`
EITHER `MnO_(2)` or `KMnO_(4)`

ANSWER :D
Discussion
11713.

Which one the following has a regular tetrahedral structure ?

Answer»

`BF_4^-`
`SF_4`
`XeF_4`
`[NI(CH)_4]^(2-)`

ANSWER :A
Discussion
11714.

Which oxide is colourless and neutral ?

Answer»

`N_(2)O`
`N_(2)O_(3)`
`N_(2)O_(4)`
`N_(2)O_(5)`

ANSWER :A
Discussion
11715.

Which of the following componds shall not produce propeneby reaction with HBr followed by elimination or direct only elimination reaction

Answer»

`CH_3CH_2CH_2OH`
`CH_2=C=O`
`CH_3CH_2CH_2Br`

SOLUTION :
Discussion
11716.

Which one of the following is Zeigler - Natta catalyst?

Answer»

`Co_(2)(CO)_(8)`
Rh/Ir complex
`TiCl_(4)+Al(C_(2)H_(5))_(3)`
`Fe//Mo`

Solution :`TiCl_(4)+Al(C_(2)H_(5))_(3)`
Discussion
11717.

When glucose is heated with nitric acid the product is

Answer»

LACTIC ACID
Saccharic acid
Glycollic acid
OXALIC acid

ANSWER :B
Discussion
11718.

Transition elements are d-block elements, with some exceptions. Usually they are paramagnetic. They show variable oxidation states. They and their compounds show catalytic property.Which is more paramagnetic: Fe^(2+)or Fe^(3+). Why?

Answer»

Solution :The electronic configurations of `FE^(2+)` and `Fe^(3+)` are given below: Since `Fe^(3+)` has more UNPAIRED ELECTRONS, it is more PARAMAGNETIC.
Discussion
11719.

Transition elements are d-block elements, with some exceptions. Usually they are paramagnetic. They show variable oxidation states. They and their compounds show catalytic propertyZn (atomic number 30) is not a transition element, though it is a d-block element. Why?

Answer»

Solution :The electronic.configuration of Zn is `[Ar]3d^10 4s^2` . It has COMPLETELY filledW- ORBITALS in its ground state and in its oxidation state of`+2`. So it is not CONSIDERED as a transition ELEMENT.
Discussion
11720.

Transition elements are d-block elements, with some exceptions. Usually they are paramagnetic. They show variable oxidation states. They and their compounds show catalytic property What is the reason for their catalytic property?

Answer»

Solution :The catalytic PROPERTY of transition metals is due to their ABILITY to show VARIABLE OXIDATION states and their ability to form complexes.
Discussion
11721.

The type of isomerism present in nitropentaamminechromium(Illchloride is

Answer»

optical
 LINKAGE
ionization
polymerization

Solution :`[Cr(NH_(3))_(5)(NO_(2))]Cl_(2)` shows linkage isomerism as well as ionization isomerism
Hence, (B) and (C) are the correct ANSWERS...
Discussion
11722.

Which acid of each pair shown here would you expect to be stronger? (ii) FCH_2COOH, ClCH_2COOH

Answer»


ANSWER :`FCH_2-COOH` (-I EFFECT of F is more than that of CL)
Discussion
11723.

What is the condition to be satisfied for a compound to be chiral?

Answer»

SOLUTION :Its MIRROR IMAGE should be non-superimposable.
Discussion
11724.

Total number of steroisomers possible for the compound H_(3)C-CH=CH-CH=CH-CH=CH-Ph are

Answer»


ANSWER :8
Discussion
11725.

Which one in the following is not the resonance structure of CO_(2)

Answer»

O=C=O
`.^(-)O-C-=O^(+)`
`.^(+)O-=C-O^(-)`
`O-=C=O`

SOLUTION :CHOICE (a),(B),© are the resonance STRUCTURE of `CO_(2)`
Discussion
11726.

What is lye

Answer»

10% SOLUTION of NaCl
10% solution of KOH
10% solution of `Ca(OH)_(2)`
10% solution of `Na_(2)CO_(3)`

ANSWER :B
Discussion
11727.

Which of the mixtures acts as antifertility drug ?

Answer»

Pestrogenic and Projestrogenic
Estrogenic and Castrogenic
Estrogenic and Progestrogenic
Mestrenal and Norestradinol 

ANSWER :C
Discussion
11728.

Which of the following statement is/are true ?

Answer»

`Cu^(2+)` salts form soluble complex with excess KCN
`Cu^(2+)` salts form soluble complex with AQUEOUS AMMONIA
`Cu^(2+)` salts form soluble complex with KI
A piece of iron or zinc when place in `Cu^(2+)` salt solution, precipitates copper

Solution :( C) is INCORRECT as with `Kl, Cu^(2+)` salts form a WHITE precipitate of `Cu_2I_2 and I_2` gas is liberated.
Discussion
11729.

Which of the following species is paramagnetic :

Answer»

1. `O_(2)^(-)`
2. `CN^(-)`
3. CO
4. `O_(2)^(2-)`

ANSWER :A
Discussion
11730.

Which type of colloid is the dissolution of sulphur (S_(8)) ?

Answer»

ASSOCIATED COLLOID 
MICELLE 
MULTIMOLECULAR colloid
Macromolecular colloid 

SOLUTION :Multimolecular colloid
Discussion
11731.

Under ambient conditions, the total number of gases released as products in the final step of the reaction scheme show below is XeF_(6)underset("hydrolysis")overset("Complete")(rarr) underset(underset(underset(underset("Products")(""darr "slow disproportionation in" OH^(-)//H_(2)O))(Q))(""darr OH^(-)//H_(2)O))(""P + "Other products")

Answer»

0
1
2
3

Solution :`XF_(6) + 3H_(2)O underset("hydrolysis")overset("Complete")rarr underset(P)(XeO_(3)) + 6 HF`

`underset(Q)(2 HXeO_(4)^(-)) 2OH^(-) underset(("Slow disproportionation"))overset(OH^(-)//H_(2)O)rarr Xe(g) + XeO_(6)^(4-) (aq) + 2H_(2)O (l) + O_(2)(g)`
Two GASES, i.e., Xe and `O_(2)` are RELEASED, i.e., option (c) is CORRECT.
Discussion
11732.

Write the IUPAC names for the following complexes. (i) Na_(2)[Ni(EDTA)] (ii) [Ag(CN)_(2)]^(-) (iii)[Co(en)_(3)]_(2)(SO_(4))_(3) (iv) [Co(ONO)(NH_(3))_(5)]^(2+) (v)[Pt(NH_(3))_(2)Cl(NO_(2))]

Answer»

Solution :`(i) Na_(2)[Ni(EDTA)]` =Sodium Ethylenediaminetetraacetatonickelate (II)
(or)
Sodium `2,2.,2..,2...-` (ETHANE `-1,2`-diyldinitrilo) tetraacetonickelate
`(ii) [Ag(CN)_(2)]^(-)`=dicyanidoargentate (I) ion
`(iii)[Co(en)_(3)]_(2)(SO_(4))_(3)`= tris (ethylendediamine) COBALT (III) sulphate
`(iv) [Co(ONO)(NH_(3))_(5)]^(2+)`= PENTAAMMINENITRITO-`kO` Cobalt (III) ion
`(v)[Pt(NH_(3))_(2)Cl(NO_(2))]` =diamminedichloridonitrito-`KN` platinum `(II)`
Discussion
11733.

The starting materials for the preparation of styrene is

Answer»

EHTANE
Ethene
ETHYNE
VINYL chloride

Answer :B
Discussion
11734.

Which are correct statements?

Answer»

RECTIFIED spirit is a BINARY AZEOTROPE
Denatured spirit CONTAINS `CH_(3)OH(~~5%)`
Ternary azeotrope is obtained when benzene is added to rectified spirit
All of the above

Answer :D
Discussion
11735.

Which of the following compounds is metallic and paramagnetic ?

Answer»

`T_(i)O_(2)`
`CrO_(2)`
`VO_(2)`
`MnO_(2)`

Solution :`T_(i)O_(2)` is METALLIC as well as paramagnetic in nature
Discussion
11736.

Vapours of Hg are present in the atomosphere form natural sources, such as volcanoes and from human activities. The cuurent level of Hg in atomsphere is 246.3 PPb by volume at 27^(@) C. [1 PPb by volume means 1 L of Hg for every 10^(9) L of air]. Calculate number of Hg atoms in atmosphere having volume of air 5 xx 10^(13) m^(3). Assume Hg vapour follow ideal gas behaviour. [Given : R = 0.0821 atm litre mole - K, N_(A) = 6 xx 10^(23) ] [Divide your answer by 10^(32)]

Answer»


SOLUTION :`PPB = (V_(Hg))/(V_("air")) xx 10^(9)`
`246.3 = (V_(hg))/(5 xx 10^(13)) xx 10^(9)`
`V_(Hg) = 246.3 xx 5 xx 10^(4)m^(3)`
`V_(Hg) = 246.3 xx 5 xx 10^(7)` litre a 1 atm and 300 K for Hg vapour :
(By volume data is given under SIMILAR P and T condition
`PV_(Hg) = n_(Hg) RT`
` atm xx 246.3 xx 5 xx 10^(7) = n_(Hg) xx 0.0821 xx 300`
`n_(Hg) = 5 xx 10^(8)`
`N_(Hg) atm = 5 xx 10^(8) xx 6 xx 10^(23)`
`= 3 xx 10^(32)`
`= (3 xx 10^(32))/(10^(32)) = 3`
Discussion
11737.

Which of the comparison Zn, Cd, Hg is/are incorrect? (I) ZnCl_(2) is ionic whereasCdCl_(2) and HgCl_(2) is covalent (II) Zn and Cd dissolves in dilute acid HCl liberating H_(2) but Hg cannot (III) Zn and cd forming with ppt. of Zn(OH)_(2) and Cd(OH)_(2) but Hg forms coloured ppt. of Hg(OH)_(2). (IV) All form A_(2)^(2+) type ion

Answer»

Only III
I, III, IV
I and III
All of these

Answer :B
Discussion
11738.

Write two conditions for the collisions to be effective collisions.

Answer»

Solution :CONDITIONS for COLLISIONS to be effective collisions
(i) Colliding molecules should have sufficient energy more than or equal to threshold energy.
(ii) They should have proper orientation to facilitate breaking of old bonds formation of NEW bonds to give PRODUCTS.
Discussion
11739.

Which of the following carboxylic acids is the most reactive towards esterification ?

Answer»

`(CH_3)_3"CCOOH"`
`(CH_3)_2CHCOOH`
`CH_3CH_2COOH`
`(C_2H_5)_2CHCOOH`

ANSWER :C
Discussion
11740.

Which one of the following represents smallest quantity?

Answer»

`1850mg`
`1.85xx10^(-4)G`
`1.85xx10^(3)mug`
`1.85xx10^(-6)kg``

Solution :`1850ng=1850xx10^(-9)g=1.85xx10^(-6)g`
`1.85xx10^(3)mug=1.85xx10^(3)xx10^(-6)g=1.85xx10^(-3)g`
`1.85xx10^(-6_kg=1.85xx10^(-6)xx10^(3)g=1.85xx10^(-3)g`
Discussion
11741.

Which element is extracted commercially by the electrolysis of an aqueous solution of one its compounds

Answer»

Sodium
Aluminium
Chlorine
Bromine

Answer :C
Discussion
11742.

To detect the reducing and non reducing sugar,which if the following test is used?

Answer»

MOLISCH test
Biuret test
Fehlings test
Millons Test

Answer :C
Discussion
11743.

Vapour pressure of aqueous glucose at 373 K is 750 mm Hg. Calculate the molality of solute present dissovled solution.

Answer»

`0.26`
`0.65`
`0.74`
`0.039`

ANSWER :C
Discussion
11744.

Which of the following is the formula of Potassium chlorate ?

Answer»

`KCLO`
`KClO_(2)`
`KClO_(3)`
`KClO_(4)`

SOLUTION :`KClO_(3)`
Discussion
11745.

Which of the following aqueous solution is ideal for conductivity of current ?

Answer»

Ammonia, `NH_(3)`
Fructose, `C_(6)H_(12)O_(6)`
Acetic acid, `C_(2)H_(6)O_(2)`
Hydrochloric acid, HCl

Solution :HCl is strong acid. Its aqueous solution has more ions as compared to others, so it is a ideal solution for conduction of current.
Discussion
11746.

Which of the following oxidse of chromium is amphoteric in nature ?

Answer»

CrO
`CrO_(3)`
`Cr_(2)O_(3)`
`CrO_(5)`

ANSWER :C
Discussion
11747.

The structure of 'c' would be:

Answer»




ANSWER :C
Discussion
11748.

Vegetables oils are

Answer»

Essential oils abstained from PLANTS
UNSATURATED ACIDS
Glycerides ofSaturated FATTY acids
Glycerides ofunsaturated fatty acids

Answer :D
Discussion
11749.

What is the order of oxidising nature of oxides of chlorine?

Answer»

SOLUTION :OXIDISING NATURE: `Cl_2OgtClO_2gtCl_2O_6gtCl_2O_7`
Discussion
11750.

Which of the following is NOT a haloalkane ?

Answer»

FREON
TEFLON
IODOFORM
VINYL chloride

Answer :D
Discussion