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5351.

What will happen to the boiling point of th solution on mixing two the seal. Assign resason.

Answer»

SOLUTION :The vapour pressure of the solution will DECREAS and its boiling will INCREASE.
Discussion
5352.

When concentrated sulphuric acid awas treated with potassium ferrocyanide, CO gas was evolved. By mistake, somebody used dilute sulphuric acid instead of concentrated sulphuric acid, then the gas evolved was:

Answer»

CO
HCN
`N_(2)`
`CO_(2)`

ANSWER :B
Discussion
5353.

The reativites of methanol (1), 1-propanol (II),2-butanol (III) and 2-methyl-2-propanol(IV)towards sodium metal follow the order

Answer»

`IgtIIgtIIIgtIV`
`IVgtIIIgtIIgtI`
`IgtIVgtIIgtIII`
`IVgtIIgtIIIgtI`

SOLUTION :N//A
Discussion
5354.

Which is the carbylamine reaction ?

Answer»

`C_2H_5NH_2+3KOH+CHCl_3 rarr C_2H_5N + 3KCl +3H_2O`
`C_6H_6+CH_3Cl overset("anhydrous")rarrC_6H_5CH_3+HCl`
`2HCHO+NaOH rarr CH_3OH+HCOONa`
`2CH_3Cl+2NararrCH_3-CH_3+2NaCl`

SOLUTION :Reaction of PRIMARY amine with chloroform in the presence of alkali base is CALLED carbylamine reaction.
Discussion
5355.

Which type of leaching process convert insolublesulphideores into soluble sulphates?

Answer»

CYANIDE leaching
Alkali leaching
Acid leaching
Hand picking

Answer :C
Discussion
5356.

The sign of Delta G for the process of melting of ice at 260 K is :

Answer»

`Delta G = 0`
`Delta G LT 0`
`Delta G gt 0`
`Delta G le 0`

SOLUTION :ICE does not melt at 260K, THEREFORE, `Delta G gt 0`
Discussion
5357.

What name is given to the reaction between hydrogen ion and hydroxyl ion

Answer»

Hydrogenenation
Hydroxylation
Hydrolysis
Neutralization

Solution :`H^(+) + OH^(-) hArr H_(2)O`, VALUE than stronger the ACID.
Discussion
5358.

The slag obtained in extraction of copper pyrites is mainly

Answer»

`FeSiO_(3)`
`MnSiO_(3)`
`CaSiO_(3)`
`CuSiO_(3)`

Solution :(a) In extraction of copper, FeO is IMPURITY, which reacts with `SiO_(2)` as flux to form `FeSiO_(3)` as slag.
`FeO+SiO_(2)RARR FeSiO_(3)`
(c) If `SiO_(2)` is added in LARGE amount, then it is removed by CaO in the form of `CaSiO_(3)`.
`CaO+SiO_(2)rarr CaSiO_(3)`, (b) and (d) are not possible.
Discussion
5359.

Which of the following given statement for semiconductor is correct?

Answer»

p-type SEMICONDUCTOR is FORMED by DOPING SI with B
p-type semiconductor is formed by doping Si with P
n-type semiconductor is formed by doping Si with Al
n-type semiconductor is formed by doping GE with B

Answer :A
Discussion
5360.

Which of the following reaction not indicates the linear structure of Glucose ?

Answer»

`C_(6)H_(12)O_(6)overset(NaHSO_(3))rarr`
`C_(6)H_(12)O_(6)overset((CH_(3)CO)_(2)O)UNDERSET("Anhydrous "ZnCl_(2))rarr`
`C_(6)H_(12)O_(6)overset(HI)underset(Delta)rarr`

ANSWER :A
Discussion
5361.

What is ligand?

Answer»

Solution :The ions or MOLECULES capable of donating at least one PAIR of electrons to the central METAL atom in the formation of coordination compounds is called ligands.
Ex. `[Cr(NH_3)_6]^(3+)Cr^(3+)` is the central atom ION and NH3 is the ligand.
Discussion
5362.

When an egg is hard boiled, there is -

Answer»

INCREASE in DISORDER
Decrease in disorder
No CHANGE in disorder
`DELTAG` is negative

Answer :A
Discussion
5363.

Which one of the following is an example of coordination compound ?

Answer»

COMMON salt
Mohr'salt
Haemoglobin
Potash alum

Answer :A::B::C
Discussion
5364.

Which is used in photography ?

Answer»

AGCL
`Ag_2S`
`AgNO_3`
`Ag_2CrO_4`

ANSWER :C
Discussion
5365.

Which of the following on tretment will yield azoxybenzene form nitrobenzene ?

Answer»

electrolysis in ACIDIC condition
`NAOH//Zn, CH_(3)OH`
`Sn//HCl`
`Na_(3)AsO_(3)//NaOH`

Solution :
Discussion
5366.

The vulcanized rubber has

Answer»

high WATER ABSORBING tendency
low elasticity
high SENSITIVITY to heat TREATMENT
high resistance to CHEMICAL oxidation

Answer :D
Discussion
5367.

Van Arkel method of purification of metals involves converting the metal to a :

Answer»

volatile STABLE COMPOUND
volatile UNSTABLE compound
non - volatile stable compound
None of these

ANSWER :B
Discussion
5368.

Trimer of acetaldehyde is called______and its structure is_______.

Answer»

SOLUTION :PARALDEHYDE.
Discussion
5369.

What isflux ? Whatis the roleof fluxin the metallurgyof ironand copper ?

Answer»

Solution :Flux is asubstancethat combineswithgangue (earthlyimpurities) which may still be presentintheroastedor THECALCINEDORE to forman easilyfusiblematerialcalledtheslag. Forexample,
(i) Intheblastfurnace in themetallurgyof iron, CaO actsas thebasic flux. It removesthe acitic impurity of`SiO_2 ` presentin THEORE toform fusiblecalciumsilicate slag
` underset ("Basic flux")(CaO(s))+underset ("Acidic impurity")(SiO_2(s)) overset (1123 K)toCaSiO_3(slag) `
(II) Copperisextractedfromcopperpyrites. Roastingof copper pyrites mainlygives ` Cu_2 S and FeO`. Toremovebasic FeO, silica`(SiO_2) `is usedas theacidicflux whichcombines withFeO to formfusicles ferrous silicateslag.
`underset ("Basic impurity")(FeO) +underset ("Acidic flux")(SiO_2) tounderset ("Ferrous silicate (slag)")(FeSiO_3) `
Discussion
5370.

The word alkyd resin means :

Answer»

ALCOHOL based
Alcohol and acid
Acid and alkali
Alkaline derivative

Answer :B
Discussion
5371.

The standard heats of formation at 298 K for C Cl_(4)(g), H_(2)O(g), CO_(2)(g) and HCl (g) are - 25.5, -57.8, -94.1 and -22.1 kcal per mole respectively. Calculate DeltaH^(@) at 298 K for the reaction, C Cl_(4)(g)+2H_(2)O(g) to CO_(2)(g)+4HCl(g)

Answer»

Solution :GIVEN that,
(i) `C(s)+2Cl_(2)(g) to C Cl_(4) (g),DeltaH^(0)=-25.5kcal`
(ii) `H_(2)(g)+(1)/(2)O_(2)(g) to H_(2)O(g),DeltaH^(0)=-57.8kcal`
(iii) `C(s)+O_(2)(g) to CO_(2)(g),DeltaH^(0)=-94.1kcal`
(iv) `(1)/(2)H_(2)(g)+(1)/(2)Cl_(2)(g) to HCl(g),DeltaH^(0)=-22.1kcal`
`CO_(2)` and HCl in eqn. (iii) and (iv) RESPECTIVELY are on the same sides as in the REQUIRED EQUATION, while `c cl_(4)` in Eqn. (i) and `H_(2)O` in Eqn. (ii) are on the opposite sides in the required equation. Hence applying,
`[-Eqn. (i)-2xxEqn.(ii)+Eqn.(iii)+4xxEqn.(iv)]`, we get,
`C(s)-2Cl_(2)(g)-2H_(2)(g)-O_(2)(g)+C(s)+O_(2)(g)+2H_(2)(g)+2Cl_(2)(g)`
` to -c cl_(4)(g)-2H_(2)O(g)+CO_(2)(g)+4HCl(g),`
`DeltaH^(0)=-(-25.5)-(2xx-57.8)+(-94.1)+(4xx22.1)`
or `c cl_(4)(g)+2H_(2)O(g) to CO_(2)(g)+4HCl(g),Delta^(0)=-41.4kcal`
Discussion
5372.

Theoretical basis of Hess's law is __________.

Answer»

KIRCHHOFF's law
law of conservation of energy
heat of ionization of STRONG ACIDS and strong bases
variation in heat of reaction

Answer :B
Discussion
5373.

Which sequence of reactions is useful to prepare 1 – propanamine

Answer»

`CH_(3)CH_(2)CN OVERSET(LiAlH_(4))to`
`CH_(3)CH_(2)Cl overset(AgCN)to overset(LiAlH_(4))to`
`CH_(3)Cl overset(KCN)to overset(LiAlH_(4))to`
`CH_(3)Cl overset(AgCN)to overset(LiAlH_(4))to`

Solution :Nitriles on reduction gives AMINES
Discussion
5374.

What is the SI units of density ?

Answer»

`"g cm"^(-3)`
`GM^(-3)`
`"KG m"^(-3)`
`"kg cm"^(-3)`

Solution :Density of substance is defined as its amount of mas PER unit VOLUME. So, SI unit of density can be obtained by using the following relation
SI unit of density `=("SI unit of mass")/("SI unit of volume")`
`=(kg)/(m^(3))or kgm^(-3)`
Discussion
5375.

Those stereoisomers that are not intercovertible by a simple rotation around a sigma-bond are called

Answer»

configurational ISOMERS
enantiomers
DIASTEREOISOMERS
all of these

Solution :Configurational isomers are interconvertible by breaking and FORMING chemical bonds. If the configurational isomers are related as nonsuperposable MIRROR IMAGES, they are called enantioners (or optical isomers) and if they are not related as such they are called diastereoisomers.
Discussion
5376.

The reduction potential of hdrogen electrode at pH 10 is

Answer»

`-0.059` V
`-0.59V`
`0.59V`
`0.0V`

ANSWER :B
Discussion
5377.

What are acetals?

Answer»

Solution :Acetals are gem-alkoxy ALKANES in which TWO alkoxy GROUPS are PRESENT on the terminal CARBON atom.
Discussion
5378.

The sharp melting point of crystalline solids is due to_____.

Answer»

a regular ARRANGEMENT of constituent PARTICLES observed over a SHORT DISTANCE in the crystal lattice.
a regular arrangement of constituent particles observed over a long distance in the crystal lattice
same arrangement of constituent particles in DIFFERENT directions
different arrangement of constituent particles in different directions.

Answer :B
Discussion
5379.

Which of the following having the higherst boiling point ?

Answer»

`0.01M Na_(2)SO_(4)`
0.015 M SUCROSE
0.015 M Glucose
`0.01M NaNO_(3)`

ANSWER :A
Discussion
5380.

Which of the following does not have a tetrahedral structure ?

Answer»

`BH_3`
`NH_4^+`
`BH_4^-`
`CH_4`

ANSWER :A
Discussion
5381.

Which of the following terms means pain killer?

Answer»

antibiotics
ANALGESIC
antiseptic
antioxidant

SOLUTION :analgesic
Discussion
5382.

When 1F of electricity is passed acidulated water, O_(2) evolved

Answer»

11.2 `DM^(3)`
5.6 `dm^(3)`
22.4`dm^(3)`
1.0 `dm^(3)`

Solution :REACTION for electrolysis of water is:
`2H_(2)Oto4H^(+)+2O^(2-)`
Reaction for electrolysis of water is
`2H_(2)Oto4H^(+)+2O^(2-)`
`2O^(-)toO_(2)+4E^(-)`
`4e^(-)+4H^(+)to2H_(2)`
`becausen=4` so 4 faraday charge will leberate
1 mole=22.4 `dm^(3)` oxygen.
`therefore1` faraday charge will LIBERATE `(22.4)/(4)=5.6dm^(3)O_(2)`.
Discussion
5383.

Which metal does not form ionic hydride?

Answer»

Ba
Mg
Ca
Sr

Answer :B
Discussion
5384.

Whichoneof thefollowing statementisFALSE ?

Answer»

THECORRECTORDEROF osmoticpressurefor0.01M aqueoussolutionof eachcompoundis
`BaCl_(2) gt CH_(3)COOH gt ` surose
Theosmoticpressure`(PI)` of a solutionisgiven by THEEQUATION`pi= MRT`where M isthe Molarityof thesolution
Roult'slawstates thatthevapourPressureof acomponentovera solutionis proportionalto itsmolefraction.
Twosucrosesolutionsof samemolalitypreparedin differentsolvents will havethe samefreezingpointdepression.

Answer :D
Discussion
5385.

What volume of carbon dioxide measured at 27^(@)C and 746.7 mm pressure would be obtained by treasting 10.0 g of pure marble with dilute hydrochloric acid ? (Aq. Tension at 27^(@)C is 26.7 mm).

Answer»

Solution :The CHEMICAL equation representing the reaction is :
`underset(100 g)(CaCO_(3))+2HCl rarr CaCl_(2)+H_(2)O+underset(22400 cm^(3)at STP)(CO_(2))`
STEP 1. To calculate the volume of `CO_(2)` evolved from 10 g of `CaCO_(3)` at step.
From the chemical equation, 100 g of marble react to produce `22400 cm^(3)` of `CO_(2)` at STP
`therefore 10 g` of marble will produce `CO_(2)(22400)/(100)xx10=2240 cm^(3)`
This is the volume of `CO_(2)` evolved at STP.
Step 2. To calculate the volume of `CO_(2)` at `27^(@)C` and 746.7 mm pressure
`{:("Initial conditions","Final conditions"),(V_(1)=2240 cm^(3),V_(2)= ? cm^(3)),(P_(1)=760 mm, P_(2)=746.7-26.7=720 mm),(T_(1)=273 K,T_(2)=27+273=300 K):}`
APPLYING the gas equation, we have
`(V_(2)xx720)/(300)=(2240xx760)/(273)`
`V_(2)=(2240xx760)/(273)xx(300)/(720)=259.8 cm^(3)`
Thus, the volume of carbon dioxide obtained `= 2598.3 cm^(3)`.
Discussion
5386.

Which of the following alkaline earth metal ions has smallest heat of hydration ?

Answer»

`Mg^(2+)`
`CA^(2+)`
`Sr^(2+)`
`Ba^(2+)`

SOLUTION :`Ba^(2+)` being LARGEST in size, GETS hydrated to least extent.
Discussion
5387.

Which of the following reactions are correct ? RCH=CH_(2)+BrC Cl_(3)overset("peroxides")rarrRCHunderset(Br)underset(|)(C)H_(2)C Cl_(3)

Answer»

only (a)
only (B)
both are correct
None of these

Answer :C
Discussion
5388.

Write the classification of amino acids , giving examples.

Answer»

Solution :The `alpha`-amino acids are of three types-acidic, BASIC and neutral.
(1) Acidic amino acids : If carboxyl GROUPS are more in number than amino groups then amino acids are acidic in nature .
Examples : Glutamic acid HOOC-`CH_(2)-CH_(2)-`, Aspartic acid `HOOC-CH_(2)-`
(2) Basic amino acids : If amino groups are more in number than carboxyl groups then amino acids are basic in nature .
Examples : Arginine `H_(2)overset(+)N=underset(NH_(2))underset(|)C-NH-(CH_(2))_(3)-`, Lysine `H_(2)N-(CH_(2))_(4)-`
(3) Neutral amino acids : The amino acids EQUAL number of amino and carboxyl groups are called neutral amino acids.
Example : Alanine `CH_(3)-`, Valine `(CH_(3))_(2)-CH`
Discussion
5389.

The sugar unit present in the nucleotides of RNA is

Answer»

`D - BETA-` RIBOSE 
`L-beta-`ribose 
D`-ALPHA-` ribose 
`L - alpha-` ribose 

ANSWER :A
Discussion
5390.

Under what condition is E_("cell") =0 or Delta_(r)G^(@)=0?

Answer»

SOLUTION :`E_("cell") =0` or `Delta_(r)G=0` when the cell REACTION reaches EQUILIBRIUM.
Discussion
5391.

What is the coordination number of sodium in Na_(2)O

Answer»

6
4
8
2

Solution :In `Na_(2)O`, each oxide IONS `(O^(2-))` is co-ordinated to `8 Na^(+)` ions and each `Na^(+)` ion to 4 oxide ions. Hence if has 4:8 co-ordination.
Discussion
5392.

Which represents the largest amount of energy :

Answer»

calorie
joule
erg
electron-volt

Answer :A
Discussion
5393.

Which does not form double salt ?

Answer»

`Li_2 SO_4`
`Na_2SO_4`
`K_2SO_4`
`Rb_2SO_4`

ANSWER :A
Discussion
5394.

What is meant by Brownian movement?

Answer»

SOLUTION :(i) Robert Brown observed that when the pollen grains suspended in WATER were viewed through an ultra microscope, they showed a RANDOM, zigzag, ceaseless motion. This is called Brownian movement of colloidal particles.
(ii) The colloidal sol particles are continuously BOMBARD with the MOLECULES of dispersion medium and hence they follow a zigzag, random, continuous movement.
Discussion
5395.

When conc. HCl is added to the solution of Cr(NO_(3))_(2), then it slowly turns green due to formation of the following

Answer»

`CrCl_(2)`
`Cr_(2)O_(3)`
`CrO_(4)`
Chlorocomplex

Answer :B
Discussion
5396.

Which transition elements exhibit +8 oxidation state ?

Answer»

CU, Zn
Ru, Os
Ag, Au
Cu, Cr

Answer :B
Discussion
5397.

Which one of the following sets forms the biodegradable polymer?

Answer»

`CH_(2)=CH-CH` and `CH_(2)=CH-CH=CH_(2)`
`H_(2)N-CH_(2)-COOH` and `H_(2)N-(CH_(2))_(5)-COOH`
`HO-CH_(2)-CH_(2)-OH` and
None of these

Answer :B
Discussion
5398.

Vinyl polymerization may occur through intermediate formation of

Answer»

CARBOCATIONS
carbanions
FREE radicals
CARBENES

Answer :A::B::C
Discussion
5399.

Write the structures of soaps obtained by the hydrolysisfat : (C_17H_33COO)_3C_3H_5Glyceryl oleate

Answer»

SOLUTION :`C_17H_35COO^(-)NA^(+)`
Discussion
5400.

Which one of the following arrangements does not give the correct picture of the trends indicated against it ? (i) F_(2) gt Cl_(2) gt Br_(2) gt l_(2) : Oxidizing power (ii) F_(2) gt Cl_(2) gt Br_(2) gt l_(2) : Electron gain enthalpy (iii) F_(2) gt Cl_(2) gt Br_(2) gt l_(2) : Bond dissociation energy (iv) F_(2) gt Cl_(2) gt Br_(2) gt l_(2) : Electronegativity.

Answer»

II and iv
I and iii
ii and iii
ii, iii and iv

Solution :From the given options we find option (i) is correct. The oxidising POWER of halogens follow the order `F_(2) gt Cl_(2) gt Br_(2) gt I_(2)`. Option (ii) is incorrect because it in not the correct order of electron gain enthalpy of halogens.
The correct order is `Cl_(2) gt F_(2) gt Br_(2) gt I_(2)` . The low value of `F_(2)` than `Cl_(2)` is DUE to its small size.
Option (iii) is incorrect. The correct order of bond dissociation energies of halogens is
`Cl_(2) gt Br_(2) gt F_(2) gt I_(2)`
Option (iv) is correct. It is the correct order of ELECTRONEGATIVITY VALUES of halogens. Thus option (ii) and (iii) are incorrect.
Discussion