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13301.

Which main group elements have a different number of outemost electrons than their group number.

Answer»

ALKALI metals
NOBLE gases
Halogens
None

ANSWER :B
Discussion
13302.

The solubility of noble gas in water increases with the increase in:

Answer»

Ionization POTENTIAL of NOBLE gas
Thermal CONDUCTIVITY of noble gas
Atomic volume of noble gas
Electron affinity of noble gas

Answer :C
Discussion
13303.

Which hydride is most acidic ?

Answer»

`H_2O`
`H_2S`
`H_2Te`
`H_2Se`

ANSWER :B
Discussion
13304.

The vapour pressure of water is 3167.2 Pa at 25^@C. What would be the vapourpressure of a solution of sucrose (with mole fraction of sucrose = 0.1) and of a solution of levulose (with mole fraction of levulose = 0.1)?

Answer»

<P>

SOLUTION :`P_("soln") = P_("SOLVENT") (1 -x_("solute") )`
2850Pa
Discussion
13305.

Which polymer can be used for making contact lenses for eyes

Answer»

Polymethylmethacrylate
Polyethelene
Polyethylacrylate
Nylon - 6

Answer :A
Discussion
13306.

Which of the following orders is not correct for the decreasing order of acidic character ?

Answer»

`CH_(3)CH_(2)CH(CL)COOH gt CH_(3)CH(Cl)CH_(2)COOH gt CH_(2)(Cl)CH_(2)CH_(2)COOH gt CH_(3) CH_(2)CH_(2)COOH`
`ICH_(2)COOH gt BrCH_(2)COOH gt ClCH_(2)COOH BT FCH_(2)COOH`
`C Cl_(3)COOH gt CHCl_(2)COOH gt CH_(2)ClCOOH gt CH_(3)COOH`
`HCOOH gt CH_(3)COOH gt C_(2)H_(5)COOH gt (CH_(3))_(2)CHCOOH`

Solution :The correct order of acidity is
`ICH_(2)COOH lt BrCH_(2)COOH lt ClCH_(2)COOH lt FCH_(2)COOH`
Discussion
13307.

Which of the following expressions is correct for the rate of reaction given below ? 5" Br"^(-)("ap")+"Br"O_(3)^(-)(ap)+6H^(+)(aq)to3" Br"_(2)(aq)+3H_(2)O(l)

Answer»

`(Delta[Br^(-)])/(Deltat)=5(Delta[H^(+)])/(Deltat)`
`(D[Br^(-)])/(Deltat)=(6)/(5)(Delta[H^(+)])/(Deltat)`
`(D[Br^(-)])/(Deltat)=(5)/(6)(Delta[H^(+)])/(Deltat)`
`(D[Br^(-)])/(Deltat)=6(Delta[H^(+)])/(Deltat)`

SOLUTION :Rate `=-(1)/(5)(Delta[Br^(-)])/(Deltat)=-(Delta[BrO_(3)^(-)])/(Deltat)=-(1)/(6)(Delta[H^(+)])/(Deltat):.(Delta[Br^(-)])/(Deltat)=5(Delta[BrO_(3)^(-)])/(Deltat)=(5)/(6)(Delta[H^(+)])/(Deltat).`
Discussion
13308.

What happens when concentrated H_(2)SO_(4) is slowly added to a mixture of solution of NaNO_(3) and FeSO_(4)?

Answer»

Green ring of `Fe(SO_(4))_(3)` is formed.
Browing ring of `[Fe(H_(2)O)_5NO]SO_(4)` is formed
Brown ring of `Fe_(2) (SO_(4))_(3)` is formed.
None of these

Solution :When conc. `H_2SO_4` is added slowly down the SIDE of the test tube contianing solution of `NaNO_3` and `FeSO_4`, a brown ring is formed at the BOTTOM layer of tube. This brown ring is due to formation of a complex nitrosoferrous sulphate.
`NaNO_3 + H_2SO_4 to NaHSO_4 + HNO_3`
`6FeSO_4 + 2HNO_3 + 3H_2SO_4 to 3Fe_2(SO_4)_(3) + 4H_2O + 2NO uarr`
`FeSO_4 + NO + 5 H_2O to underset(("brown ring"))([Fe(H_2O)_(5) NO]SO_4)`
Discussion
13309.

The salt having the least solubility in water is :

Answer»

`BaCl_(2)`
`BA(NO_(3))_(2)`
`MgSO_(4)`
`BaSO_(4)`

ANSWER :D
Discussion
13310.

Which is/are true statement(s)?

Answer»

All halogens form oxy acids.
All halogens show -1, +1, +3, +5 and +7 oxidation states
 HF is a dibasic acid and ATTACK glass.
Oxidizing power is in order `F_(2)gtCl_(2)gtBr_(2)gtI_(2)`.

Answer :C::D
Discussion
13311.

What of the followng statement about the advantage of roasting of sulphide ore before reduction is not true ?

Answer»

`Delta G_(F)^(a)`of the SULPHIDE is greater than `CS_(2) and H_(2) S`
`Delta G_(f)^(a)`is negative for roasting of sulphide ore to oxide
Roasting of the sulphide to oxide is ther-modynamically feasible
Carbon and hydrogen are suitable reducing agents for metal sulphides

ANSWER :D
Discussion
13312.

The value of distergration constant of a radioactive isotope

Answer»

<P>decreases with INCREASING temperature
decreases will increasing pressure
increases with increasing concentration
is independent of temperature, pressure and concentration.

Solution :`lambda`, i.e, decay constant is independent of P,T concentration and is CHARACTERISTIC constant for a given SPECIES.
Discussion
13313.

Which is more cidic (or basic), aniline or ammonia?

Answer»

Solution :Due to delocalization of the lone pair of electrons of the N-atom of ANILINE over the benzene ring, aniline is less basic than AMMONIA.
Conversely, loss of a proton from aniline gives ion (I) while than from `NH_(3)` gives ion (II).
.
Since ion (I) is stabilized by RESONANCE while ion (II) is not. therefore, aniline is more acidic than ammonia.
Discussion
13314.

The solubility product of a salt having a general formula MX_2 in water is 4 times 10^-2. The concentration of M^(2+) ions in the aqueous solution of the salt is………

Answer»

`2.0 times 10^-6 M`
`1.0 times 10^-4M`
`1.6 times 10^-4 M`
`4.0 times 10^-10 M`

Solution :`MX_2 LEFTRIGHTARROW M^(2+)+2X^-`
`K_(sp)=(2S)^2 (s)=4s^2`
`s=sqrt(K_(sp)/4)=sqrt((4 times 10^-12)/4)`
`=1.0 times 10^-4 M`
Discussion
13315.

When 4.2 g NaHCO_(3) is added to a solution of CH_(3)COOH weighing 10.0 g, it is observed that 2.2 g CO_(2) is released into atmosphere . The residue is found is weigh 12.0 g . Show that these observations are in argreement with the law of conservation of mass.

Answer»

SOLUTION :`NaHCO_(3) + CH_(3)COOH to CH_(3)COONa + H_(2)O + CO_(2)`
Initial mass =4.2 + 10=14.2
Final mass=12+2.2=14.2
Thus, during the COURSE of reaction law of conservation of mass is obeyed
Discussion
13316.

When phosphine is passed through aqueous solution of copper sulphate, the product is

Answer»

`[Cu(OH)_(2)]`
`Cu_(3)P_(2)`
`[Cu(PH_(3))_(4)]^(2+)`
`[Cu(PH_(3))_(2)]^(2+)`

Answer :B
Discussion
13317.

Which is not found in native state:

Answer»

Pt
Au
Cu
Na

Answer :D
Discussion
13318.

Which of the following pairs given Cl_(2) at room temperature ?

Answer»

CONC. `HCl+KMnO_(4)`
`NACL+"conc". H_(2)SO_(4)`
`NaCl+MnO_(2)`
`NaCl+"conc". HNO_(3)`

Solution :`2KMnO_(4)+16HCl to 2KCl +2MnCl_(2)+8H_(2)OO+5Cl_(2)`
Discussion
13319.

What is the main steps during obtaining metals from ores?

Answer»

CONCENTRATION of metal 
Isolation of METALS from CONCENTRATED ORES 
Concentration of ores 
All (A), (B) and (C) 

Answer :D
Discussion
13320.

Which is an example of auto-catalyst ?

Answer»

HYDROLYSIS of METHYL acetate
Decomposition of TNG
Oxidation of OXALIC ACID by `KMnO_4`
All

Answer :D
Discussion
13321.

What is metamerism? Explain metamerism with suitable examples of ethers.

Answer»

Solution : Ethers having the same molecular formula but different alkyl GROUPS attached on EITHER side of the oxygen atom are called METAMERS of each other. This phenomenon is called METAMERISM.
Metamers of 2-methoxy propane `( CH_(3) -O- overset(CH_(3))overset(|)(CH) - CH_(3))`are as follows:
(1) `CH_(3) - O- CH_(2) -CH_(2)- CH_(3)`1 - methoxy propane .
`CH_(3)- CH_(2) - O- CH_(2) - CH_(3)` Ethoxy ethane.
Discussion
13322.

What are the product in the following reaction ? CH_(3) - overset(CH_(3)) overset(|) (C) = CH_(2) underset(dil.H_(2)SO_(4)) overset(K_(2)Cr_(2)O_(7)+) to

Answer»

`CH_(3) - COCH_(3) " and " H- COOH`
`CH_(3) - CH_(2) CHO " and " CO_(2)`
`CH_(3) - COOH " and " H - COOH`
`CH_(3) - CHO " and "H - COOH`

ANSWER :A
Discussion
13323.

When calcium benzoate is distilled with calcium formate , the product is :

Answer»

BENZOIC acid
Benzene
Benzaldehyde
Benzophenone.

Answer :C
Discussion
13324.

Which property of colloidal solution is independent of charge on the colloidal particles?

Answer»

Coagulation
Electrophoresis
Electro - osmosis
Tyndall effect

Solution :Tyndall effect is an optical property, so it is INDEPENDENT of CHARGE.
Discussion
13325.

Which is the method of purification of colloidal solution ?

Answer»

ULTRAFILTRATION
electrodialysis
bredig's ARC METHOD
dialysis

Answer :A::B::D
Discussion
13326.

The standard enthalpy of combustion of sucrose is – 5645 kJ mol^(-1). What is the advantage (in kJ mol–1 of energy released as heat) of complete aerobic oxidation compared to anaerobic hydrolysis of sucrose to lactic acid ? DeltaH^(@) f for lactic acid, CO_(2) and H_(2)O is –694, –395.0 and –286.0 respectively

Answer»

SOLUTION :ADVANTAGE = `5393 KJ MOL^(-)`
Discussion
13327.

What is corrosion ? What are the factors which influence corrosion ?

Answer»

SOLUTION :For ANSWER, CONSULT SECTION 23.
Discussion
13328.

Vapour pressures of pure acetone and chloroform at 328 K are 741.8 mm Hg and 632.8 mm Hg respectively. Assuming that they form ideal solution over the entire range of composition, plot P_("total") P_("chloroform"), and P_("acetone")as a function of x_("acetone") . The experimental data observed for different compositions of mixture is : Plot this data also on the same graph paper. Indicate whether it has positive deviation or negative deviation from the ideal solution.

Answer»

<P>

SOLUTION :
The plot for `P_("TOTAL")`DIPS downwards, hence the solution shows negative deviation from the ideal behaviour.
Discussion
13329.

Which statement is false

Answer»

Some disinfectants can be used antiseptics at LOW concentration
Sulphadiazine is a synthetic antibacterial
Ampicillin is a natural ANTIBIOTIC
Aspirin is ANALGESIC and antipyratic both

SOLUTION :Ampicillin is a synthetic anitbiotic.
Discussion
13330.

Which one of the following contains acetic acid:

Answer»

Vinegar
Molasses
Coal- TAR
Butter

Answer :A
Discussion
13331.

Which of the following transition involves maximum amount of energy ?

Answer»

`M^(-)(G) to M(g)`
`M(g) to M^(+) (g)`
`M^(+) (g) to M^(2+) (g)`
`M^(2+) (g) to M^(3+) (g)`

ANSWER :A
Discussion
13332.

When a certain amount of ethylene was burnt 6226 kJ heat was evolved. If heat of combustion of ethylene is 1411 kJ, the volume of O_2(at NTP) that entered into the reaction is:

Answer»

296.5 mL
296.5 litre
622x22.4 litre
22.4 litre

Answer :B
Discussion
13333.

Which reagent is used to convert ethan-l1,2-diol into Ethanal?

Answer»

Anhydrous `ZnCl_2`
DILUTE. `H_2SO_4`
Either (a) or (6)
CONC. `H_2SO_4`

SOLUTION :Either (a) or (B)
Discussion
13334.

Which compound has highest boiling point

Answer»




SOLUTION :BRANCHES `uarr` b.p `darr` `1^(@)` amine `GT 2^(@)RNH_(2)`
Discussion
13335.

Which acid can combine with its own salt again

Answer»

HF
HBr
HCl
HI

Answer :A
Discussion
13336.

When two moles of [Co(NH_3)_5Cl]Cl_2 is treated with excess silver nitrate solution, the number of moles of silver chloride formed is

Answer»

3
6
4
2

Answer :C
Discussion
13337.

The size of colloidal particles ranges from ......

Answer»

SOLUTION :`1 MU ` to ` 1 mu m` DIAMETER
Discussion
13338.

Which of the following aqueous salt solutions is expected to have pH less than 7 ?

Answer»

`CH_(3)COOK`
`CH_(3)COONH_(4)`
NaCl
`NH_(4)CL`

Answer :D
Discussion
13339.

Whichof the followingare anionicdetergents ?

Answer»

Sodium salts of sulphonated LONG chain alcohol
Ester of stearic ACID and polyethylene glycol
Quaternary ammonium salt of amine with acetate ion
Sodium salts of sulfonated long chain hydrocarbons

Answer :A::D
Discussion
13340.

What molar concentration of NH_3 provides a [OH^-] OF 1.5xx10^(-3) ? (K_b= 1.8xx10^(-5)):

Answer»

0,125 M
`(0.125+1.5xx10^(-3))` M
`(0.125-1.5xx10^(-3))` M
`1.5xx10^(-3) M

Answer :A
Discussion
13341.

Write the names of the reagents and equations in the conversionof (i) Phenol to salicylaldehyde (ii) anisole to p-methoxyacetophenone.

Answer»

SOLUTION :
Discussion
13342.

Which of the following participate in aldol condensation

Answer»

FORMALDEHYDE
BENZALDEHYDE
Methanol
Acetaldehyde

ANSWER :D
Discussion
13343.

Which of the following structures represents Neoprene polymer ?

Answer»




ANSWER :B
Discussion
13344.

What will be the vapour pressure of the solution of 18 gram glucose dissolve in 178.2 gram water at 100^(@)C temp. ?

Answer»

706.4 mm
752.4 mm
750 mm
760 mm

Solution :Mole of water `(N)=(178.2)/(18)=9.9`
Mole of GLUCOSE `(n)=(18)/(180)=0.1`
`THEREFORE (p^(@)-p)/(p^(@))=(n)/(n+N) therefore p=752.4` mm
Discussion
13345.

Which is false for catalyst?

Answer»

A CATALYST can INITIATE a REACTION
It does not alter the position of EQUILIBRIUM in a reversible reaction
A catalyst remains unchanged in quality and COMPOSITION at the end of reaction
Catalysts are sometimes very specific in respect of a reaction

Answer :A
Discussion
13346.

The value of the 'spin only' magnetic moment for one of the following configurations is 2.82 B.M. The correct one is

Answer»

`d^(5)` (in strong ligand field)
`d^(3)` (in weak as well as in storng FIELDS)
`d^(4)` (in weak ligand fields)
`d^(4)` (in storng ligand fields)

Solution :
`mu=SQRT(N(n+2))=sqrt(3)=1.73` B.M.

`mu=sqrt(3(5))=sqrt(15)=3.87` B.M.
`d^(4)-`in weak ligand field

`mu=sqrt(4(6))=sqrt(24)=4.89 `B.M.

`mu=sqrt(2(4))=sqrt(8)=2.82` B.M.
Discussion
13347.

Which of the folowing 3d-orbitals has electron density in all the three axes?

Answer»

`3d_(xy)`
`3d_(z^(2))`
`3d_(YZ)`
`3D^(ZX)`

Answer :B
Discussion
13348.

Which of the followig is/are correct?

Answer»

EVOLVED `N_(2)` gas on reaction with `NaNO_(2)//HCl`
Benzaldehyde does not gives FEHLING solution TEST.
gives bright YELLOW ppt. with `I_(2)//OH^(ɵ)`
HYDRAZINE gives prussian blue colour in lassigne's test.

Solution :
Discussion
13349.

Toluene on oxidation with dilute HNO_3 and alkaline KMnO_4 gives

Answer»

BENZALDEHYDE
Phenol
Nitrotoluene
Benzoic acid

Solution :
Discussion
13350.

Which of the following species(s) act as reducing agent.

Answer»

`[Co(CN)_(6)]^(4-)`
`[Co(NO_(2))_(6)]^(4-)`
`[V(CO)_(6)]`
`[MN(CO)_(6)]`

Solution :`underset((O.A))(V(CO)_(6))+e^(-) tounderset(EAN=36)[V(CO)_(6)]^(-)`
`underset((R.A.))(Mn(CO)_(6)) to underset(EAN=36)[Mn(CO)_(6)]^(+)+e^(-)`
Discussion