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4651.

Which is not correct for terylene ?

Answer»

Stepwise polymerization
NATURAL fibres
CONDENSATION polymer
It is also called DACRON

SOLUTION :Natural fibres
Discussion
4652.

There is no relation between the stoichiometry of the reaction and order of the reaction, order is always experimently calculated. Monitoring of the progress of the reaction can be done by pressure measurement (P_0,P_t & P_oo are total pressure of reaction mixture at time, t=0, t=t & t=oo) .All following reactions in Column-1 have half life 5 minutes. Select correct combination for second order reaction :

Answer»

(iii)(ii)(R)
(iii)(iv)(R)
(ii)(iii)(R)
(iv)(iii)(S)

Solution :In column-3 (iii) is second order REACTION for `2^(nd)` order `t_(1//2)ALPHA1/(CO)`& 75% COMPLETED in 15 min. (III)(II)
Discussion
4653.

There is no relation between the stoichiometry of the reaction and order of the reaction, order is always experimently calculated. Monitoring of the progress of the reaction can be done by pressure measurement (P_0,P_t & P_oo are total pressure of reaction mixture at time, t=0, t=t & t=oo) .All following reactions in Column-1 have half life 5 minutes. Select correct combination for zero order reaction :

Answer»

(ii)(III)(P)
(ii)(iv)(P)
(iii)(ii)(P)
(iv)(ii)(S)

Solution :In column-1 (ii) is zero order reaction for zero order `t_(1//2) ALPHA` CO & 75% completed in 7.5 min & 87.5% completed in 8.75 min.(II)(III)(P)
Discussion
4654.

Write the structure of the major organic product in each of the following reactions :CH_(3)CH(Br)CH_(2)CH_(3)+NaOH overset(" water ")rarr

Answer»

SOLUTION :`CH_(3)-underset("OH ")underset("| ")("C ")H-CH_(2)CH_(3)`
Discussion
4655.

There is no relation between the stoichiometry of the reaction and order of the reaction, order is always experimently calculated. Monitoring of the progress of the reaction can be done by pressure measurement (P_0,P_t & P_oo are total pressure of reaction mixture at time, t=0, t=t & t=oo) .All following reactions in Column-1 have half life 5 minutes. Select incorrect combination for I^(st) order reaction :

Answer»

(i)(i)(Q)
(IV)(i)(Q)
(iv)(iv)(S)
(IV)(ii)(S)

Solution :In column-1 (i) &(iv) are `I^(st)` ORDER REACTIONS for `I^(st)` order `t_(3//4)=2t_(1//2)`
Discussion
4656.

Which pentafluorides cannot be formed ?

Answer»

`PF_5`
`AsF_5`
`SbF_5`
`BiF_5`

ANSWER :D
Discussion
4657.

Which of the following statement is not true about enzyme inhibitors ?

Answer»

inhibit thecatalytic activity of the enzyme
Preventthe binding of substrate
GENERALLY a strong covalent bond is formed between an inhibitor and an enzyme
Inhibitors can be competitive or non-competitive

Solution :Drugs can block the binding site of the enzyme and present the binding of substrate or can inhibit the catalytic activity of the enzyme . Such durgs are called enzyme inhibitors. Durgs inhibit the attachment of substrate on active site of enzyme in two different ways.
(i) Durgs which compete with natural substrate for their ATTACHEMENT on the active sites of enzymes are cale competitive inhibitors.

(ii) However, some drugs do not bind to the active site but bind to a different site of ANZYME i.e., allosteric site which changes the shape of the active site of the enzyme in such a way that the natural substrate cannot recogniz it. Such enzymes are called non-competitive inhibitors.
Generally,a WEAK bond such as hydrogen bonding, van der Waal's interactions ETC, is formed between the enzyme and inhibtor.
Discussion
4658.

Which one of the following would be optically active?

Answer»

Succinic ACID
Lactiv acid
Meso TARTARIC acid
Chloroacetic acid

ANSWER :B
Discussion
4659.

Which is the most poor reducignagent

Answer»

1. dihygrogen
2. nascent HYDROGEN
3. ATOMIC hydrogen
4. all have same reducingstrength

ANSWER :A
Discussion
4660.

Which of the following has highest K_(a) value?

Answer»




ANSWER :D
Discussion
4661.

Which of the following order is correct ?

Answer»

`K^(+) LT CA^(2+) lt P^(3-) lt S^(2-)` : Ionic size
`Na_((aq.))^+gt K_((aq.))^+ gt Rb_((aq.))^+ gt Cs_((aq.))^+` ELECTRICAL conductance
`Al_((aq.))^(3+) gt Mg_((aq))^(2+)gt Na_((aq.))^+` , Hydrated size
`I_((aq.))^(-) lt Br_((aq.))^(-) lt Cl_((aq.))^(-) lt F_((aq.))^(-)` :Ionic mobility

Answer :C
Discussion
4662.

Which is correct statement regarding enzyme catalysis

Answer»

catalytic activity of amylase is enhanced considerably in PRESENCE of `Co^(+2)` ions which act as activators 
trypsin converts PROTEINS into preptides in stomach 
a small non-protein PRESENT along with an enzyme enhance catalytic activity considerably 
ACTIVE centres on the surface of enzyme prarticles are `-NO_2, -OCH_3, -C_2H_5` etc

Solution :For amylase enzyme activator is `Na^(+)`
In intenstine - engyme is Trypsin , Active centres `- COOH, NH_2........ `
Discussion
4663.

Which one of the following hormone controls blood pressure?

Answer»

Adrenal
Thyroid
Thymus
ADRENALINE

Solution : Adrenal cortex the outer PART of the gland controls BLOOD PRESSURE and also helps in regulating metabolism. It helps our body to RESPOND the stress.
Discussion
4664.

What happens when X eF_(6)reacts with NaF ?

Answer»

SOLUTION :It forms `Na^(+)[X e F_(7)]//XeF_(6)+NAF rarr Na^(+) [ X e F_(7)]^(-)`.
Discussion
4665.

Using the Gibbs energy change, DeltaG^(@) =+63.3 kJ,for the following reaction, Ag_(2)CO_(3)(s) ""2Ag^(+)(aq)+CO_(3)^(2-)(aq)theK_(sp)" of "Ag_(2)CO_(3)(s) in water at 25^(@)C is (R=8.314 J K^(-1)mol^(-1))

Answer»

`2.9 xx 10^(-3)`
`7.9 xx 10^(-2)`
`3.2 xx 10^(-26)`
`8.0 xx 10^(-12)`

Solution :`DeltaG^(@)=-2.303" RT log Ksp"`
`63300=-2.303xx8.314xx298 log K_(sp)`
`K_(sp)=8xx10^(-12)`
Discussion
4666.

Write the structure and oxidation numbers of sulphur in tetrathionic acid.

Answer»

SOLUTION :`HO-overset(O)overset(||)underset(O)underset(||)S-S-overset(O)overset(||)underset(O)underset(||)S-OH` (or) tetrathionate `.^(-)O-overset(O)overset(||)underset(O)underset(||)S-S-S-overset(O)overset(||)underset(O)underset(||)S-O^(-)`
Tetrathionic acid or its salt tetrathionate has persulphide link, `S-S`.
The OXIDATION states of sulphur are: `+5, 0, 0 and +5`.
The AVERAGE oxidation state of Sis `+2.5`.
Discussion
4667.

The separation of an emulsion into its constituent liquids is known as

Answer»

emulsification
protective of colloid
coagulation
DEMULSIFICATION

Solution :The separation of an emulsion into its CONSTITUENTS is called demulsification . Various methods of demulsification are FREEZING, boiling, centrifugation or CHEMICAL methods.
Discussion
4668.

What volume of hydrogen gas at STP would be liberated by the action of 50 mL of dilute H_(2)SO_(4) of 40% purity and having a density of 1.3 g mL^(-1) on 20 g of zinc ? (Atomic mass of Zn = 65)

Answer»

Solution :Step I. Calculation of mass of pure `H_(2)SO_(4)`
`"Mass of 50 mL of dilute "H_(2)SO_(4)="Volume "xx"DENSITY = (50 mL)"xx("1.3 g mL"^(-1))=65g`
`"But 100 g of "H_(2)SO_(4)" contains pure "H_(2)SO_(4)=(40)/(100)xx65g=26g`
Step II. Calculate of volume `H_(2)` EVOLVED at STP
The reaction TAKING place is
`underset("= 65 g")underset("1 mol")(Zn)+underset("=98 g")underset("1 mol")(H_(2)SO_(4))rarrZnSO_(4)+underset("= 22.4 L at STP")underset("1 mol")(H_(2))`
Obviously, `H_(2)SO_(4)` is the limiting REAGENT
`"(because 20 g of Zn requires "H_(2)SO_(4)=(98)/(65)xx20" = 30 g which is not present)"`
`"98 g of "H_(2)SO_(4)" evolve "H_(2)="22.4 L at STP"`
`therefore"26 g of "H_(2)SO_(4)" will evolve "H_(2)=(22.4)/(98)xx26=5.94L`
Discussion
4669.

Which of the following metal sulphides has maximum solubility in water ?

Answer»

`HGS(K_(sp)=10^(-54))`
`FES(K_(sp)=10^(-20))`
`ZnS(K_(sp)=10^(-22))`
`Cds(K_(sp)=10^(-30))`

Answer :B
Discussion
4670.

Which statement is wrong about chloroform:

Answer»

CHLOROFORM Is USED as anaesthetic
Chloroform has distorted tetrahedral shape
Chloroform is used as a solvent
Chloroform has `sp^2` - hybridised CARBON atom

Answer :D
Discussion
4671.

underset((1:20))(Xe+Fe_(2)) overset(573K,60-70" bar")to? The compound formed in above reaction is

Answer»

`XeF_(2)`
`XeF_(4)`
`XeF_(6)`
`XeOF_(4)`

ANSWER :C
Discussion
4672.

Which of the following arrangement represents correct order of electron gain enthalpy (with negative sign) of the given atomic species?

Answer»

`SltOltCl LT F`
`CL lt F lt S lt O`
`F lt Cl lt O lt S`
`O lt S lt F lt Cl`

ANSWER :D
Discussion
4673.

When lead storage battery is charged

Answer»

Lead dioxide dissolves
SULPHURIC acid is REGENERATED
The lead electrode becomes coated with lead sulphate
The amount of sulphuric acid decreases

Solution :During charging of a lead storage battery, the REACTION at the andoe and cathode are
anode: `PbSO_(4)+2e^(-)toPb+SO_(4)^(2-)`
Cathode: `PbSO_(4)+2H_(2)OtoPbO_(2)+4H^(+)+SO_(4)^(2-)+2e^(-)`
In both the REACTIONS `H_(2)SO_(4)` is regenerated.
Discussion
4674.

Which of the following resonating structures of 1-methoxy-1, 3-butadiene is least stable.

Answer»

`overset(Θ)(C)H_(2)-CH = CH-CH=overset(Θ)(O)-CH_(3)`
`CH_(2)=CH_(2)-overset(Θ)(C)H-CH=overset(Θ)(O)-CH_(3)`
`overset(Θ)(C)H_(2)-overset(Θ)(C)H - CH = CH-O-CH_(3)`
`CH_(2)=CH-overset(Θ)(C)H-overset(Θ)(C)H-O-CH_(3)`

SOLUTION :The octet of all atoms are complete in structures a and b. The molecule in which all the atoms have COMPLETED octet is more stable than atom which have incomplete octet. Larger the number of resonating structure, larger will be the STABILITY, thus structures a and b stable.
In structure (d), the electron deficient of positive CHARGED carbon is DULY compensated by one pair electrons of adjacent oxygen atoms while such neighbor group support is not available in structure (c). Hence structure c is least stable in comparision to structure (d).
Discussion
4675.

What weights of P_(4) O_(6) and P_(4) O_(10) will be produced by thecombustion of 2 g of P_(4) in 2 g of oxygen leavingno P_(4) and O_(2) ?

Answer»


ANSWER :1.996 G, 2.004 g
Discussion
4676.

Which of the following increase with increase in temperature

Answer»


SOLUTION :Explanation
(a) Is CORRECT because vapour pressure `prop T`.
(b) Is correct because Osmotic pressure `prop T`.
(c ) Is wrong because boling point is FIXED at a constant temperature.
(d) Is wrong because freezing point does not CHANGE with temperature.
Discussion
4677.

Which of the following associated with isotonic solution is not correct ?

Answer»

They will have the same osmotic pressure
They have the same weight concentration
Osmosis does not TAKE place when the two solutions are SEPARATED by as semipermeable membrane
They will have the same vapour pressure.

Answer :B
Discussion
4678.

Which of the following statement(s) is (are) true for Mohr's salt ?

Answer»

It does not DECOLOURISES `KMnO_4` solution
It is a double salt
Oxidation STATE of FE is +3
It is a secondary standard solution

Solution :Moh.s salt `(NH_4)_2.Fe(SO_4)_2. 6H_2O, Fe^(+2)` changes to `Fe^(+3)` with `KMnO_4` solution
Discussion
4679.

Which of the following are functional isomers?

Answer»

ALCOHOLS and ethers
Alcohols and ACIDS
Alcohols and ALDEHYDES
Alcohols and ketones

Answer :D
Discussion
4680.

Transition elements are good conductor of current because :

Answer»

They are METALS
They are all SOLIDS
They have FREE ELECTRONS in outer energy orbits
All of these

Answer :D
Discussion
4681.

Transition metals combine with halogens at high temperature to form compounds calledhalides. On account of high activation energy , the reactions require high temperatureto start, but once thethe reaction is started , the heat of reaction is sufficientto maintain the continuity .Metals in higheroxidation state form flourides as it is the most electronegative element . Flourides are ionic in nature . The chlorides , bromides and iodides have ionicas well as covalent character . Halides of metals is higher oxidation statesare relatively unstable and hydrolysed very easily . DeltaH_(f) is negative for

Answer»

FLOURIDES
BROMIDES
IODIDES
All of these

ANSWER :D
Discussion
4682.

Write the unit of rate constant for a zero order reaction.

Answer»

SOLUTION :`K = MOL L^(-1)s^(-1)`.
Discussion
4683.

Write the ionisation isomer of [Cr(H_2O)_5Br]SO_4

Answer»

SOLUTION :`[CR(H_2O)_5SO_5]BR`
Discussion
4684.

What are biodegradable and non biodegradable detergents ? Give one example of each.

Answer»

Solution :The detergent which can decomposed by bacteria is known as biodegradable detergent. They are LINEAR CHAIN of hydrocarbons. e.g., Sodium laurylsulphate.
The detergent which can not decomposed by bacateria is CALLED non-biodegradable detergent. They had long hydrocarbon chain which is HIGHLY branched so bacteria can not degrade easity. e.g., Sodium benzen sulphonate.
Discussion
4685.

Which one of the following is polymers is prepared by condensation polymerization ?

Answer»

TEFLON
RUBBER
STYRENE
NYLON - 66

Answer :D
Discussion
4686.

Which of the following reagent used to identify fructose ?

Answer»

NEUTRAL `FeCl_3`
`CHCl_3` / ALC KOH
Ammoniacal `AgNO_3`
IODINE

ANSWER :C
Discussion
4687.

Write the reaction and the conditions involved in the conversion of : (a) Propene to 1 - propanol (b) Phenol to Salicylic acid

Answer»

Solution :(a) Propene to 1 - PROPANOL :
`underset("Propene")(CH_(3)-CH=CH_(2))overset((i)B_(2)H_(6))underset((II)H_(2)O_(2)//OH^(-))rarr underset("1 - propanol")(CH_(3)CH_(2)CH_(2)OH)`
`underset("Propene")(CH_(3)-CH=CH_(2)+HBR)overset("Benzoyl peroxide")underset(underset("ADDITION")("Anti-Markovnikov"))rarr underset("1-Bromopropane")(CH_(3)CH_(2)CH_(2)Br)+KOH(aq)rarr underset("Propan-1-ol")(CH_(3)CH_(2)CH_(2)OH)+KBr`
(b) Phenol to Salicylic ACID :
Discussion
4688.

What is the PH at which Mg(OH)_2 begins precipitate from a solution containing 0.10 M Mg^(2+) ions.[K_sp of Mg(OH)_2 = 1xx10^(-11)]

Answer»

5
9
4
10

Answer :B
Discussion
4689.

What is meant by a coupling reaction? Explain with suitable examples.

Answer»

Solution :Diazonium salts REACT with certain aromatic compounds
having an electron-rich group `(e.g.-OH,-NH_(2), etc.)` to FORM azo
compounds. This reaction is an electrophilic substitution and are called
coupling reaction. Azo compounds are brightly coloured and are used
as dyes and indicators. Coupling reaction is an electrophilic
substitution reaction, Benzene diazonium chloride reacts with alkaline
solution of phenol to give p-hydroxy azo benzene (orange dye).
Benzene diazonium chloride reacts with aniline in MILD alkaline
medium to give p-aminobenzene (yellow dye).
Discussion
4690.

The relative densit of a mixture of nitrogen and oxygen is 154.4(H=1) and the relative densities of nitrogen and oxygen are 14.0 and 16.0 (H=1) respectively. Calculate the composition of the mixture (i) by volume and (ii) by mass.

Answer»

Solution :(i) LET 1 mL of the mixture contain x mL of `N_(2)` and (1-x) mL of `O_(2)`.
Mass of x mL of `N_(2)=14.0xx x=14x g` (Mass `=dxxF`)
Mass of `(1-x)mL` of `O_(2)=16.0xx(1-x)=(16.0-16x)g`
Total mass of mixture `=14x+16.0-16x`
So, `14x+16.0-16x=14.4xx1=14.4`
or `x=0.8`, i.e., 80% by volume
Oxygen `=1-x=(1-0.8)=0.2`, i.e. 20% by volume.
(ii) Let 1 g of the mixture contain x g of `N_(2)` and (1-x)g of oxygen.
Volume of x g of `N_(2)=(x)/(14.0) (V=("mass")/("DENSITY"))`
Volume of `(1-x)g` of `O_(2)=((1-x))/(16.0)`
Total volume of the mixture `=(x)/(14.0)+((1-x))/(16.0)`
So, `(x)/(14.0)+((1-x))/(16.0)=(1)/(14.4)`
or `x=0.7778`, i.e., 77.78% by mass
Oxygen `=(1-x)=(1-0.7778)=0.2222`
i.e., 22.22% by mass.
Discussion
4691.

Which of the following characteristic is not the point of similarity between lanthanoids and actinoids?

Answer»

Both are STRONGLY REDUCING in nature
Both have stable oxidation state of +3
Both have same tendency towards COMPLEX formation
Both are ELECTROPOSITIVE in nature

Answer :C
Discussion
4692.

What is the major productobtained when ArN_(2)^(+)Cl^(-) treatedwith KI ?

Answer»


ANSWER :ARL
Discussion
4693.

Which among the following will not act as a reducing agent?

Answer»

`KNO_2`
`KI`
`NaNO_3`
`H_2S`

ANSWER :C
Discussion
4694.

Which of the following compounds gives 3-Ethylpentan-3-ol by the action of ethyl magnesium iodide followed by acid hydrolysis ?

Answer»

Propanone
Butanone
Pentan-2-one
Pentan-3-one

Answer :A::C::D
Discussion
4695.

Which of the following will show Tyndall effect?

Answer»

Aqueous SOLUTION of soap below critical micelle concentration 
Aqueous solution of soap above critical micelle concentration 
Aqueous solution of sodium chloride 
Aqueous solution of SUGAR 

Solution :Above critical micelle concentration (CMC), soap MOLECULES aggregates to FORM a micelle which behaves as a COLLOID and thus it shows Tyndall effect.
Discussion
4696.

Which of the following complexes has maximum CFSE?

Answer»

`K_(3)[Fe(CN)_(6)]`
`K_(3)[Co(Ox)_(3)]`
`K_(3)[CoF_(6)]`
`K_(3)[Co(CN)_(6)]`

SOLUTION :Among Li & Na, Na is more ELECTROPOSITIVE
Among F, Cl & Br, Fis most ELECTRONEGATIVE
So, Na& F will have maxima electronegativity difference.
`{:("EN value=",F,Cl,Br,I,Li,Na),(,4,3,2.8,2.5,1,0.9):}`
Discussion
4697.

What is the co-ordination number of Cr in K_(3)[Cr("ox")_(3)] ?

Answer»


SOLUTION :OXALATE ION is a BIDENTATE LIGAND.
Discussion
4698.

Which of the following statement is incorrect with respect to metallic or electronic conductivity

Answer»

Metallic conductivity depends on the structure of metal and its characteristics
Metallic conductivity depends on the NUMBER of electrons in the valencshell of atom of metal
The ELECTRICAL conductivity of metal increases with increase in temperature
There is no change in the structure of metal during electrical conduction

Solution :For metal,
As TEMP, increases RESISTANCE increases hence conductivity DECREASES.
Discussion
4699.

What are these? i) solid solutions ii) colligative properties iii) isotonic solution

Answer»

Solution :i) A binary solution in which the solvent is a SOLID.
ii) Property of the solution that depends only on the NUMBER of solute particles and not on their nature relative to the TOTAL number of particles in solution.
iii) Two solutions that have same OSMOTIC PRESSURE at same temperature is called isotonic solution.
Discussion
4700.

Which compound gives acetylene on reaction with water ?

Answer»

`Al_4C_3`
`Mg_3N_2`
`CaC_2`
`CaH_2`

ANSWER :C
Discussion