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11351.

There are three underline ("position isomers ")of the amine having molecular formula C_3 H_7 NH_2

Answer»

Solution : There are three FUNCTIONAL isomers of the AMINE having molecular formula `C_3 H_7 NH_2`.
Discussion
11352.

Which concerning Bohr's model are true?

Answer»

Predicts that probability of electron near nucleus is more
Angular momentum of electron in H atom `=(nh)/(2PI)`
INTRODUCES the IDEA of stationary states
Explains LINE spectrum of hydrogen

Answer :B::C::D
Discussion
11353.

The value of equilibrium constant of a reversible reaction at a given temperaure :

Answer»

DEPENDS on the initial concentration of reactants
depends on the concentration of PRODUCTS at equilibrium
gets REVERSED when the mode of representation of the reaction is reversed.
changes when the unit of ACTIVE MASS is changed.

Answer :C::D
Discussion
11354.

What are the factors which influence the adsorption of a gas on solid?

Answer»

SOLUTION :(i) Nature of the adsorbate (ii) Nature of the adsorbent (iii) Surface area of adsorbent (iv) ACTIVATION of the SOLID adsorbent (v) Porosity of adsorbent (vi) Temperature (vii) PRESSURE of the gas
Discussion
11355.

Which of the following are secondary bromides?

Answer»

`(CH_(3))_(2)CHBr`<BR>`(CH_(3))_(3)C CH_(2)Br`
`CH_(3)CH(Br)CH_(2)CH_(3)`
`(CH_(3))_(2)CBrCH_(2)CH_(3)`

Answer :A::C
Discussion
11356.

The vapour pressure of a liquid decreases by 10 torr when a non-volatile solute is dissolved. The mole fraction of the solute in solution is 0.1. What would be the mole fraction of the liquid if the decrease in vapour pressure is 20 torr, the same solute being dissolved?

Answer»

0.2
0.9
0.8
0.6

Answer :C
Discussion
11357.

Which of the following complexes is not a chelate?

Answer»

bis(dimethylglyoximato)nickle(II)
POTASSIUM ethylenediaminetetrathiocyanatochromate(III)
tetraamminediazidocobalt(III)nitrate
trans-diglycinatoplatinum(II)

ANSWER :C
Discussion
11358.

Write the structures of all aromatic iodides with the formula C_7 H_7 I.

Answer»

Solution :There are four structural aromatic IODIDES with the FORMULA `C_(7)H_(7)I`
Discussion
11359.

What are the physical states of dispersed phase and dispersion medium of froth ?

Answer»

Solution :DISPERSED phase : Gas
DISPERSION MEDIUM: LIQUID.
Discussion
11360.

Which of the followingforms C_(2)H_(5)NH_(2) on reduction ?

Answer»

`C_(2)H_(5)CN`
`CH_(3)CHO`
`CH_(3)CN`
`CH_(3)NC`

Answer :C
Discussion
11361.

Whichof the followingis not correct ?

Answer»

Ethyl amineand amilineboth have `-NH_(2)` group
Ethyl amine andanilinedissolvein HCI
Ethylamineand anilinebothreact with`CHCI_(3)` andKOHto formunpleasant Smellingcompound
Ethylamineand anilinebothreact with `HNO_(2)` to givehydroxyl compound.

SOLUTION :`C_(5) H_(5)NH_(2) + HNO_(2) toC_(2) H_(5) OH +N_(2)+ H_(2) O`
`C_(6)H_(5)NH_(2)+ HNO_(2)underset( Delta ) (to)(##MRV_CHE_MCQ_XII_C13_E01_120_S01##) + N/ACI+ H_(2) O`
AnilineBenzenediazoniumchloride
Discussion
11362.

Which one of the following order presents the correct sequence of the increasing basic nature of the given oxides?

Answer»

`Al_(2)O_(3)ltMgOltNa_(2)OltK_(2)O`
`MgOltK_(2)OltAl_(2)O_(3)ltNa_(2)O`
`Na_(2)OltK_(2)OltMgOltAl_(2)O_(3)`
`K_(2)OltNa_(2)OltAl_(2)O_(3)ltMgO`

Answer :A
Discussion
11363.

Which is ferromagnetic?

Answer»

Ni
Co
`CrO_3`
All

Answer :D
Discussion
11364.

Which polymer is used in preparation of ragzin foot ware ?

Answer»

TEFLON
ORLON
BUTYL RUBBER
PVC

Solution :PVC
Discussion
11365.

Usually, CaCl_(2) is prefferred over NaCl for cleaning snow on roads particular in very cold countries. This is because

Answer»

NaCl makes the road slippery but `CaCl_(2)` does not
`CaCl_(2)` is hygroscopic but NaCl is not
`CaCl_(2)` is less soluble in `H_(2)O` than NaCl
eutectic MIXTURE of `CaCl_(2)/ H_(2)O` freezes at `-55^(@)C` while that of `NaCl/ H_(2)O` freezes at `-18^(@)C`

Solution :N//a
Discussion
11366.

When orthoboric acid (H_3BO_3) is heated the residue left is :

Answer»

BORIC anhydride
Metaboric acid
Boron
Borax

Answer :A
Discussion
11367.

The salt which is least likely to be found in minerals is

Answer»

NITRATE
CHLORIDE
SULPHIDE
SULPHATE

ANSWER :A
Discussion
11368.

Which one of the following is called Mesityl oxide?

Answer»


`C_6H_5-undersetoverset(||)(O)(C ) - CH_3`
`(CH_3)_2C = CHCOCH_3`
`C_6H_5-undersetoverset(||)(O)(C ) - C_6H_5`

SOLUTION :`(CH_3)_2C = CHCOCH_3`
Discussion
11369.

The units of surface tension and viscosity of liquids are respectively

Answer»

`kgm^(-1)s^(-1),Nm^(-1)`
`kgs^(-20,kgm^(-1)s^(-1)`
`Nm^(-1),kgm^(-1)s^(-2)`
`kgs^(-1),kgm^(-2)s^(-1)`

Solution :Surface tension
`=("FORCE")/("Length")=N/m=(kgms^(-2))/m=kgs^(-2)`
`F= eta A.(dv)/(DX)`
`eta=F/(A . (dv)/(dx))implieseta= N/(m^(2)XX(ms^(-1))/m)=Nm^(-2)s`
`=kgms^(-2)m^(-2)s=kgm^(-1)s^(-1)`
Discussion
11370.

Which one of the following statements is incorrect about enzyme catalysis ?

Answer»

Enzymes are mostly proteinous in nature.
ENZYME action is specific.
Enzymes are DENATURED by ultraviolet RAYS and at high TEMPERATURE.
Enzymes are least REACTIVE at optimum temperature.

Answer :D
Discussion
11371.

Why a black suspension of lead (II) sulfide in water turns white when ozone is passed through it?

Answer»

Solution :`O_3` oxidises BLACK COLOURED `PbS` to WHITE coloured `PbSO_4`
`PbS + 4O_3 rarr PbSO_4 + 4O_2`
Discussion
11372.

Which method is used for refining Zr and Ti ? Explain with equation.

Answer»

Solution :Zr and Ti are refined by Van Arkel method. The metal is HEATED with `I_2` and the metal iodide FORMED is decomposed by heating.
`underset("(IMPURE)")(Zr) + 2I_2 to ZrI_4 OVERSET(1800k)(rarr) underset("(pure)")(Zr) + 2I_2`
Discussion
11373.

What is the density of solution of sulphuric acid used as an electrolyte in lead accumulator?

Answer»

1.5 g m`L^(-1)`
`1.2 GML^(-1)`
`1.8 GM L^(-1)`
`2.0 gmL^(-1)`

SOLUTION :`1.2 gmL^(-1)`. It is a FACT
Discussion
11374.

Ullmann reaction is given by :

Answer»

`C_(6)H_(5)-CI`


SOLUTION :N//A
Discussion
11375.

The structure of organic compound having IUPAC nomenclature, 2,8-Dimethyl-5-(2-methylpropyl)nonane

Answer»

(## AAK_MCP_28_NEET_CHE_E28_009_A001 ##) `
(## AAK_MCP_28_NEET_CHE_E28_009_A002 ##) `
(## AAK_MCP_28_NEET_CHE_E28_009_A003 ##) `
(## AAK_MCP_28_NEET_CHE_E28_009_A004 ##) `

ANSWER :D
Discussion
11376.

Which is not the chracteristics of the transition metals ?

Answer»

They SHOW variable oxidation states
They form coloured compounds
They have LOW ENTHALPY of atomisation
They ACTS as good catalysts

Solution :Transitionmetalshave highenthalpyof atomisation.
Discussion
11377.

What does K_(b) value for an amine stand for ?

Answer»


Answer :`K_(B)` VALUE stands for dissociation constant of a BASE. If DENOTES the basic strength of a base.
Discussion
11378.

When conc. H_2SO_4is added to s~lution of potasium dichromate

Answer»

A yellow solid of chromate sepearates out
A yellow solid of CR (VI) OXIDE sepearates out
A purple red solid of chromate separates out
A purple red solid of Cr (VI) OXIDES seperates out

Solution :Conc, `H_2SO_4` acts as dehydrating agent
`K_2Cr_2O_7 + H_2SO_4 rarr H_2Cr_2O_7 rarr H_2O + 2CrO_3`
Discussion
11379.

Which is an example of chlorodising roasting:

Answer»

`Ag_2S+2NaCIrarr2AgCI+Na_2S`
`PbS+2O_2rarrPbSO_4`
`AgCI+2HgrarrAgHg+HgCI`
Both (a) and ©

Answer :D
Discussion
11380.

Which of the following correctly represent the equivalent conductivity (^^_(N)) and molar conductivity (^^_(M)) of aluminium sulphate where equivalent conductivities of Al^(+3) and SO_(4)^(-2) are lamda_(1) and lamda_(2) respectively?

Answer»

.^^_(N)=lamda_(1)+lamda_(2)`
.^^_(M)=3lamda_(1)+2lamda_(2)`
.^^_(N)=(lamda_(1))/(3)+(lamda_(2))/(2)`
.^^_(M)=6lamda_(1)+6lamda_(2)`

ANSWER :A::D
Discussion
11381.

Which of the following molecules or ions may act as a bidenatate ligand ?

Answer»

`CO_3^(2-)`
`NO_3^(-)`
`CH_3C=N`
`C_2O_4^(2-)`

SOLUTION :`CO_3^(2-)` and `NO_3^-` are flexidentate LIGANDS having 1 or 2 donor OXYGEN atoms
`C_2O_4^(2-)` -2 donor oxygen atoms.
`CH_3C-=N`-1 donor NITROGEN atoms
Discussion
11382.

Which of the following set of atomic numbers belongs to group 16 elements ?

Answer»

`56,37,20`
`52,8,84`
`16,32,50`
`36,9,17`

ANSWER :B
Discussion
11383.

Vitamin B_(2)is called _______.

Answer»

RETINOL
FOLIC ACID
Ascorbic acid
RIBOFLAVIN

SOLUTION :Riboflavin
Discussion
11384.

What is an adsorption istherm ? Describe Freundlich adsorption isotherm.

Answer»

Solution :Adsorption ISOTHERM. It REPRESENT the vartiation the moss of the gas adsorbed per gram of the adsorbent with PRESSRUE at constant temperature.
Discussion
11385.

The vitamin used in the building of collagen is _____.

Answer»

VITAMIN A
Vitamin C
Vitamin E
Vitamin K

SOLUTION :Vitamin C
Discussion
11386.

Which of the following reactions will occur ? (1) ArN_(H)^(+) Cl^(-) + CuBr rarr ArBr + CuCl + N_(2) (2) (3) ArN_(H)^(+) + Cl + [H] overset(H_(3)PO_(2) // H_(2)O)rarr ArH + N_(2) + Cl^(-) (4) Ar N_(2)^(+) Cl_(-) + I^(-) rarr Ar I + N_(2) + Cl^(-) Select the correct answer using the codes given below

Answer»

`1, 2 " and " 4`
1, 3 and 4
1, 2 and 3
2, 3 and 4

Solution :In the reaction (B) p-hydroxy azobenzene is formed.
Discussion
11387.

Which acid is strongest ?

Answer»

`Cl_3CCOOH`
`Cl_2HCOOH`
`ClCH_2COOH`
`CH_3COOH`

ANSWER :A
Discussion
11388.

Which of the following stes of groups activates the ortho and para positions in electrophilic aromaticsubstitutions ?

Answer»

`-OH,-NO_2,-CHO`
`-NH_2, NO_2`
`-OH-OR`
`-OR,-C-=N,-CL`

ANSWER :C
Discussion
11389.

Which of the following compound is obtained by Sandmeyer reaction ?

Answer»

BENZYL chloride
Aniline
CHLOROBENZENE
PHENOL

Answer :C
Discussion
11390.

Which among the following exhibit geometrical isomerism ?

Answer»

1, 1-Dichloroethene
2-Butene
1-Butene
2-Methyl-2-butene

Answer :B
Discussion
11391.

Which of the following is produced when anaqueous solution of butan-2-ol is refluxed with dilute acidic KMnO_(4)?

Answer»

butanol
butanoic acid
potassium butanoate
butanone

Solution :
Discussion
11392.

Which of the following is used as a catalyst for preparaing Grignard reagent

Answer»

Iron POWDER
Iodine powder
Activated charcoal
Manganese dioxide

Solution :`RX+Mg UNDERSET(I_(2)" powder")OVERSET("Dry ether")toR-Mg-X`
Discussion
11393.

What will be the product formed when phenol is treated with benzoyl chloride in the presence of a base?

Answer»

PHENYL ACETATE
Phenyl enthanoate
Phenyl BENZOATE
BENZYL acetate

SOLUTION :Phenyl benzoate
Discussion
11394.

Which substance is themostabundant substance in plnatkingdom ?

Answer»

SOLUTION :CELLULOSE
Discussion
11395.

van't hoff's factor for a solution is less then one.What is the conclusion drawn from it?

Answer»

SOLUTION :SOLUTE UNDERGOES ASSOCIATION.
Discussion
11396.

Which types of proteins undergo denaturation?

Answer»

`ALPHA`-HELIX type
Globular
`BETA`- PLEATED types
Fibrous

Answer :B
Discussion
11397.

The total number of valence electrons in 4.2 g of N_(3)^(-)ions is (N_Ais the Avogadro number):

Answer»

`1.6 N_A`
`3.2 N_A`
`2.1 N_A`
`4.2 N_A`

Solution :Each N- atom has 5 VALENCE ELECTRONS
` therefore ` Total number of electrons in `N_(3)^(-)` ion ` = 5 xx 3 + 1 = 16`
MOLES of `N_(3)^(-)` ions present ` = (4.2)/(42) = 0.1 `(mol. Wt.of `N_(3)^(-)1 = 42 )`
` therefore ` No. of valenceelectrons in 4.2 g`= 0.1 xx 16 xx N_A =1.6 N_A`
Discussion
11398.

Which metal is commonly used for galvanising iron?

Answer»

Cr
Zn
Cd
Sn

Answer :B
Discussion
11399.

Write short notes on the following (c) Hardy Schulze Rule

Answer»

Solution :(c) Hardy Schulz Rule : Coagyulaying value of a COAGULATING ion is directly PROPORTIONAL to the charge on the ion .
E.g., `Na^(+) LT Ca ^(++) lt AL^(3+)`For negatively charged SOL
`Cl^(-) lt CO_(3)^(2-) lt PO_(4)^(3-) lt [Fe(CN)_(6)]^(4-)`For positive sol
Discussion
11400.

Which does not react with cold water ?

Answer»

`Mg_3N_2`
`CaC_2`
`COCl_2`
SiC

Answer :D
Discussion