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84501.

All reactions are of 1st order . At time t=t_1(t_1gt0) ([B])/([C])=alphaTherefore at timet=t_2 (where t_2get_1) ([C])/([D])=betaWhich of the following is correct ?

Answer»

`ALPHA gt BETA`
`alpha=beta`
`alphabeta=0.4`
`alpha+beta=0.4`

Solution :`[[B]]/[[C]]=(3k_1)/(8k_1)=3/8=alpha` (at any time)
`[[C]]/[[D]]=(8k_1)/(7.5k_2)=8/7.5=beta` (at any time)
`:. alphabeta=0.4`
Discussion
84502.

All radioactive transformations follow ________ order kinetics.

Answer»

ZERO
FIRST
second
third

ANSWER :B
Discussion
84503.

All reaction with chemical dissociation are

Answer»

Reversible
Reversible and ENDOTHERMIC
EXOTHERMIC
Reversible or irriversible and endothermic or exothermic

SOLUTION :Chemical dissociations are reversible and endothermic.
Discussion
84504.

All radioactive disintegration reactions follow.......... kinetics.

Answer»

SOLUTION :FIRST ORDER
Discussion
84505.

All proteins are made up of alpha-amino acids which act as the building blocks. alpha-amino acids that are synthesised in the body, are known as non-essential alpha-amino acids while the one which the body fails to synthesise, are called essential alpha-amino acids. All of them exist as dipolar ions also known as Zwitterions. For all the alpha-amino acids, there is a certain pH of the medium known as isoelectric point at which the dipolar ions behave as electrically neutral species. In acidic medium, the ion migrates towards cathos while in basic medium, it migrates towards anode on passing electric current. Which is basic amino acid ?

Answer»

ASPARTIC ACID
Histidene
Valine
Leucine

Answer :B
Discussion
84506.

All products are in keto form. The correct statement(s) is/are:

Answer»

<P>`P_(1)` and `P_(2)` are diastereomeric pair
`P_(1)` and `P_(2)` are identical compound.
In reaction (iv) reactant and product are enatiomeric pair.
`P_(3)` and `Q_(3)` are optically ACTIVE stereo ISOMERS and both are enantiomeric pair

Solution :
Discussion
84507.

All possible carbonyl compounds with molecular formula (C_(8)H_(8)O) which has a benzene ring gives in its structure and gives positive Tollen's test, when are reacted with hydroxylam in how many organic products will be possible with difference in melthing point ?

Answer»


SOLUTION :
These are POSSIBLE CARBONYL COMPOUNDS each of which will form two OXIMES.
Discussion
84508.

All ores are minerals,but all minerals are not ores.Explain

Answer»

Solution :A naturalluy occuring substance obtained by mining which contains the metal in free state or in the form of compounds is CALLED a mineral .In most of the minerals ,the metal of intrest is.Present only in SMALL of them contains a reasonable PERCENTAGE of metal.Such minerals that contains a HIGH percentage of metal ,form which it can be extracted CONVENIENTLY and economically are called ores.Hence all ores are minerals but all minerals are not ores.
Discussion
84509.

All ores are minerals, but all minerals are not ores. Why?

Answer»


Answer :Any compound of METALS found in the earth's crust is called a MINERAL. The mineral from which metal can be conveniently EXTRACTED is called ore. So all minerals are not ORES.
Discussion
84510.

All oresare minerals , but all minerals cannot be calledas ores ,

Answer»

Solution :A naturally occurring substance obtained by mining which contains the METAL in FREE STATE or in the form of compounds is called a mineral. In most of the minerals, the metal of interest is present only in small amounts and some of them contains a reasonable PERCENTAGE of metal. Such minerals that contains a high percentage of metal, from which it can be extracted conveniently and economically are called ORES. Hence all ores are minerals but all minerals are not ores.
Discussion
84511.

All of the statements concerning monosaccharides are correct except ?

Answer»

The number of stereisomers possible is `2", where n is the number of chiral CARBON atoms in the molecules
Monosaccharides with 5 or 6 carbon atoms exist in SOLUTION in cyclic form
The two different cyclic forms of a particular mnosaccharide are called tautomers
Hemiacetal

Answer :C
Discussion
84512.

All of the statements concering monoraccharides are correct except

Answer»

the NUMBER of OPTICAL ISOMER is `2^n` where 'n' is the number of asymmetric carbon atoms
monoraccharides with 7 to 10 CARBONS are carbohydrates
As a monoraccharides compound MUST contain minimum three carbons atoms
dihydroxy acetone is optically inactive

Answer :B
Discussion
84513.

All of the following share the same crystal structure except

Answer»

RbCl
LiCl
CsCl
NaCl

ANSWER :B
Discussion
84514.

All of the following share the same crystal structure except.

Answer»

RbCI 
CCI 
LiCi 
NACL 

Answer :B
Discussion
84515.

All of the following obey Sidgwick effective atomic number rule except :

Answer»

`Ni(CO)_(4)`
`Fe(CO)_(5)`
`[V(CO)_(6)]^(-)`
`K_(3)[Fe(CN)_(6)]`

SOLUTION :`{:([Ni(CO)_(4)],"ENA of Ni"=36),([Fe(CO)_(5)],"ENA of Fe"=36),([V(CO)_(6)]^(-),"ENA of V"=36),(K_(3)[Fe(CN)_(6)],"ENA of Fe"=35):}`
Discussion
84516.

All of the following metals are silvery white except

Answer»

Zn
Pb
Mg
Cu

Answer :D
Discussion
84517.

All of the following decompose easily on heating to give O_(2) except

Answer»

HgO
`MnO _(2)`
`Pb(NO_(3)) _(2)`
`NaNO _(3)`

ANSWER :B
Discussion
84518.

All of the following complex show decrease in their weight when placed in magnetic balance then the group of complexes having tetrahedral geometry is I) Ni(CO)_(4)II) K[AgF_(4)]III) Na_(2)[Zn(CN)_(4)] IV) K_(2)[Pt(Cl_(4)]V) [RhCl(pph_(3))_(3)]

Answer»

II, III, IV
I, II, III
I, III, IV
None

Solution :I) `[Ni(CO)_(4)]`- tetrahedral
II) `K[AgF_(4)]`- square planar.
III) `Na_(2)[Zn(CN)_(4)]`- tetrahedral.
IV) `K_(2)[PtCl_(4)]`- square planar.
V) `[RHCL(PPh_(3))_(3)]`- square planar.
Discussion
84519.

All of the following are the example of benzenoid aromatic compounds, except

Answer»

TOLUNE
Azulene
Naphthalene
Anhracene

Answer :B
Discussion
84520.

All of the following are example of fibrous proteins except

Answer»

wool
silk
horn
insulin

Answer :D
Discussion
84521.

All of the following are bases except ......

Answer»

`N_2H_4`
`NH_(3)OH`
`NH_(3)`
`N_3H`

Solution :`N_(2)H_4, NH_2OH,NH_3` - are bases - Lewis bases `N_3H` - is Hydrazoic acid `N_(3)H rarr underset("AZIDE")(N_3^(Theta))+H^(+)`
Discussion
84522.

All of the following amino acids participates in H-bonding except …………………..

Answer»

Cysteine
Valine
Threonine
SERINE

Solution :Serine
Discussion
84523.

All nobe gases crystallise in the ccp kstructure except

Answer»

HELIUM
Neon
ARGON
KRYPTON

Solution :All noble gas crytallizes in the CCP structure EXCEPT He which has hcp structure.
Discussion
84524.

All natural and artificial radioactive decay of unstable nuclei take place by __________ kinetics.

Answer»

SOLUTION :FIRST ORDER
Discussion
84525.

All natural processes are _____ process.

Answer»


ANSWER :IRREVERSIBLE
Discussion
84526.

All monosaccharides are defined as

Answer»

NON REDUCING sugars
reducing sugars
hydrolysing sugar
non-hydrolysing sugars

Answer :D
Discussion
84527.

Allmonosaccharides.......Tollen's reagent

Answer»

Oxidises
Condense with
Reduces
Add to

Solution :When MONOSACCHARIDES are treated with TOLLEN's reagent (ammonical silver NITRATE solution), silver MIRROR or black ppt. is formed
Discussion
84528.

All minerals are not ore but all ores are minerals. The extraction of a particular metal depends upon several factor and overall it has to be convenitent and economical. Following common steps are involved in extraction of metal from its prime ore: (a) Pulverisation (b) Concentration (c) Calcination/Roasting (d) Smelting and Reduction (e) Purifaction of crude metal Which of the following options is correct? State true and false (P) Fe_(2)O_(3) can be reduced by coke as well as aluminium. (Q) Red bauxite is is concentrated by leaching method. (R ) Impure Zn is purified by either distilation or electrolytic is refining method. (S ) Wrought iron is a purest form of iron.

Answer»

TTTT
FTTT
FTFT
TFTF

Answer :A
Discussion
84529.

All monosaccharide __________ Tollen's reagent.

Answer»

oxidizes
REDUCES
CONDENSE with
ADD to

ANSWER :B
Discussion
84530.

All metal chlorides are soluble in water except those of :

Answer»

AG, Pb, Hg
Na, K, Ca
Zn, CU,Cd u ]
Ba, Sr, Li

Answer :A
Discussion
84531.

All Ln^(3+) ions are strong reducing agent in solid and aqueous medium. Which is due to

Answer»

HIGH I.P.
high LATTICE ENERGY
high hydration energy and high negative VLUE of reduction POTENTIAL
all of these

Answer :D
Discussion
84532.

All ligands are :

Answer»

LEWIS acids
Lewis BASES
Netural
NONE of these

Answer :B
Discussion
84533.

All ligands are

Answer»

LEWIS acid
Lewis base
Neutral
None

Answer :B
Discussion
84534.

All lanthanides exhibit a stable valency of

Answer»

2
3
4
6

Solution :We know that all LANTHANIDE shows STABLE valency of 3. It is due to stability of 4F orbitals, high I. P., high lattie energy of solid, high hydration energy of `Ln^(3+)` ion in aqueous medium and high NEGATIVE value of reduction potential.
Discussion
84535.

All lanthanide mineral contains all elements except

Answer»

Er
Eu
PM
Tb

ANSWER :C
Discussion
84536.

All isocyanides on hydrolysis with water in presence of HCI yield.....

Answer»

SOLUTION : FORMIC ACID
Discussion
84537.

All halogens are colourless.Is ItCorrect?

Answer»

SOLUTION :COLOURED
Discussion
84538.

All except one may be caused by a virus:

Answer»

Poliomyelitis
Influenza
Malaria
Small pox

Answer :C
Discussion
84539.

All energetically effective collision do not result in a chemical change.Explain with the help of an example.

Answer»

Solution :For formation of product by chemical REACTION molecule must experience fruitful COLLISION.The fruitful collision in which MOLECULES have (i)Sufficient kinetic energy (Threshold energy ) (ii)Proper orientation.If the molecules have sufficient kinetic energy but proper orientation is not than product will not from . eg. In the product of methanol from bromomethane ,if proper collision is there between methyl bromide and `OH^(-)` then only the product will form .
product will not form as -vely charged `Br^(-)` and `overset(-)OH` both repeal each other .
`CH_(3)Br` and `overset(-)OH` does bnot have proper orientation.

Product will form because negatively charged `Ooverset(-)H` i behind of `Br^(-)` opposite direction so it collide with carbon having `+delta` charge and form information when proper energy and proper direction is there the collision convert into the product .
`K=underset("Proper orintation")((PZ)/(uarr))ABxxunderset("syfficition threshold energy REQUIRED")((e^(-(Ea)/(RT)))/(uarr))`
Discussion
84540.

All energetically effectivecollisionsdo notresult in a chemical change. Explain withthe help of an example.

Answer»


SOLUTION :Only effective collision lead to theformation of products. It means thatcollisionsin whichmolecules collide with suffiecentkinetic energy(called thresholdenergy =activation energy+ energypossessed by reacting species.)
Andproperorientation lead toa chemicalchangebecause it faciliataes the breakingof old bonds between(reactant) moleculesand FORMATIONOF thenewones i.e., in porducts.e.,g formationof METHOD FOM bromometheane dependsupon the orientation of thereactant molecules.

The proper orientation of reactan molecules leads to bond formationwherasimproper orientationmakesthem simplyblackand no products are formed .
To account for effectivecollisons, anotherfactor P (probabilityor steric factor) isintroduced`K = PZ_(AB)e^(-E_(a)//RT)`
Discussion
84541.

All elements except carbon have the tendency to show maximum covalency of six ___________

Answer»

due to presence of VACANT d-orbitals
due to ABSENCE of vacant d-orbitals
due to presence of PARTIALLY FILLED d-orbitals
due to presence of completely filled d-orbitals

Answer :A
Discussion
84542.

All element in 3rd period have

Answer»

An ATOMIC NUMBER 3
3 complete sub-shells
Valence ELECTRONS shell
3 electrons less than the octet

Answer :C
Discussion
84543.

All drying oils contain a large amount of :

Answer»

Linoleic acid
Linolenic acid
Both (a) and (B)
None

Answer :C
Discussion
84544.

All diamagnetic complex of Ni is sqaure planar (if co-ordination number of Ni is 4) the statement is 'true' or 'false'. Justify your answer.

Answer»

Solution :Statement is not correct.
`[NI(CO)_(4)]` is diamagnetic, but it is tetrahedral.
Discussion
84545.

All digestive enzymes are:

Answer»

Ligases
Oxidases
transferases
Hydrolases

Answer :D
Discussion
84546.

All Cu(II) halides are known except the iodide. The reason for is that

Answer»

iodine is a bulky ion
`Cu^(2+)` oxidizes iodideto iodine
`Cu^(2+)` has MUCH more negative hydration enthalpy
`Cu^(2+)` ion has SMALLER size

Solution :`2Cu^(2+) + 4I^(-) to 2CuI_(2)`
`2CuL_(2)` immediately DECOMPOSES to give `I_(2)` and INSOLUBLE copper (I) iodide.
Discussion
84547.

All Cu(II) halides are known except iodide. The reason for this is that

Answer»

iodide ION is a bulkyion
`CU^(2+)` oxidizes iodide to iodine
`Cu^(2+) ` (aq) has much more negative hydration enthalpy
`Cu^(2+)` ion has smaller size

Solution :Iodide `(I^(-))` ions are stronger REDUCING agent. They reduce `Cu^(2+)` to `Cu^(+) ( 2CuI_(2) RARR Cu_(2)I_(2)+ I_(2))` In other words, `Cu^(2+)`oxidizes `I^(-)` ions to`I_(2)`
`(2Cu^(2+) + 4I^(-) rarrCu_(2)I_(2)(s)+ I_(2))`
Discussion
84548.

All crystals exhibit imperfections. a) Which law is related to this statement? b) Draw the picture showing Frenkel defect.

Answer»

SOLUTION :THIRD LAW of THERMODYNAMICS
Discussion
84549.

All colloidal dispersions have

Answer»

variabel VALENCY of gold
LOW OSMOTIC pressure
no osmotic pressure
high osmotic pressure.

Answer :B
Discussion
84550.

All citrus fruitsand amla richin vitamin…………

Answer»

SOLUTION :VITAMIN C
Discussion