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6851.

What happens when ? Give equations only: (i) chlorine reacts with CS_(2) in pressure of anhydrous aluminium chloride . (ii) Chloride is heated with alcoholic KOH and aniline. (iii) Ethyl alcohol is heated with ionic and sodium hydroxide. (iv) Ethyl alcohol reacts with bleaching powder. (v) Chloride is passed through ethyl alcohol. (vi)Ethyl bromide reacts with sodium ethoxide. (vii) Ethyl bromide reacts with silver cyanide. (viii) Chloral is treated with aqueous sodium hydroxide. (ix) Carbon tetrachloride is treated with hydrogen fluoride in pressure of antimony fluoride. (x) Ethyl amine is heated with chloroform and alcoholic KOH. (xi) Chloroform is boiled with aqueous potassium hydroxide. (xii) Ethyl bromide is treated with alcoholic caustic soda. (xiii) Ethyl bromine is heated with zinc. (xiv) Methyl magnesium bromide is treated with formaldehyde followed by hydrolysis. (xv) 2-Bromopentane is heated with alcoholic KOH. (xvi) 2-Chloro-2- methylpropane is treated with potassium tert-butoxide in dimethyl sulphoxide. (xvii) tertiary Butyl chloride reacts with ethylene in presence of AICI_(3) (xviii) Benzene reacts with n-propyl chloride in pressure of anhydrous AICI_(3)

Answer»

Solution :`(i) CS_(2) +3CI_(2) overset(AICI)(to) C CI_(4) +S_(2)CI_(2)``(i) CS_(2) +3CI_(2) overset(AICI)(to) C CI_(4) +S_(2)CI_(2)`
`(ii) C_(6)H_(5)NH_(2) +CHCI_(3)+3KOHto C_(6)H_(5)NC+3KCI +3H_(2)O`
`(iii) C_(2)H_(5)OH + 4I_(2) + 6KOH to CHI_(3)+HCOOK + 5KI +5H_(2)O`
`(iv) CaOCI_(2) +H_(2)O to Ca(OH)_(2)+CI_(2) , C_(2)H_(5)OH overset(CI_(2))underset([O])(to)`
`CH_(3)CHO overset(CI_(2))(to) C CI_(3)CHO overset(Ca(OH)_(2))(to) CHCI_(3)+ (HCOO)_(2)Ca`
`(v) C_(2)H_(5)OH overset(CI_(2))underset([O])(to) CH_(3)CHO overset(CI_(2))(to) underset(("Chloral"))(C CI_(3)CHO)`
`(vi) C_(2)H_(5) Br+ NaOC_(2)H_(5) to C_(2)H_(5)OC_(2)H_(5) +NaBr`
`(v ii)C_(2)H_(5)Br+ AGCN to C_(2)H_(5)NC +AgBr`
`(v i i i)C CI_(3) CHO + NaOH to CHCI_(3) +HCOONa`
`(i x) C CI_(4) +H_(2) F_(2) overset(SbF_(2))(to) underset(("Freon"))(C CI_(2)) F_(2) + 2HCI`
`(x ) C_(2)H_(5)NH_(2) +CHCI_(3)+3KOH to C_(2)H_(5)NC + 3KCI +3H_(2)O`
`(x i) CHCI_(3) +4KOH to HCOOK +3KCI +2H_(2)O`
`(x i i) C_(2)H_(5)Br + ALC. KOH to C_(2)H_(4) + KBr + H_(2)O`
` (x i ii) 2C_(2)H_(5)Br +2Zn to (C_(2)H_(5))_(2)Zn + ZnBr_(2)`
Discussion
6852.

Which is not the use of sulphuric acid ?

Answer»

PETROLEUM refining
Detergent industry
Manufacture of AQUA regia
In STORAGE batteries

Answer :C
Discussion
6853.

Which polymer having, intermoleculer forces are more than elastomers and less fibers ?

Answer»

THERMOSETTING
THERMOPLASTIC
Polyamide
Polyester

Solution :Thermoplastic
Discussion
6854.

Which compounds on Clemmenson reduction give 2-methyl propane

Answer»

Solution :`underset("Isobutyl ALCOHOL")(CH_(3)-OVERSET(CH_(3))overset(|)(CH)-CHO)overset(Zn//Hg)tounderset("2-methyl propane")(CH_(3)-underset(CH_(3))underset(|)(CH)-CH_(3))`
Discussion
6855.

Write the electronic configuration of the elements with atomic numbers 61 ,91, 101 and 109 .

Answer»

Solution :`Z= 61` ( Promethium , P m ) , E.C.`= [Xe]^(54) 4f^(5) 5d^(0)6S^(2)`
`Z=91` ( Protactium, Pa) , E.C. `= [rN]^(86) 5F^(2) 6D^(1) 7 S^(1)`
`Z= 101 ` ( MENDELEVIUM, Md), E.C. `= [Rn]^(86) 5f^(13) 6d^(0) 7S^(2)`
`Z =109` ( Meitnerium, Mt ) , E.C.`= [ Rn]^(86) 5f^(14) 6d^(7) 7s^(2)`
Discussion
6856.

What is the conjugate base of OH^(-)

Answer»

`O_(2)`
`H_(2)O`
`O^(-)`
`O^(2-)`

Solution :`OH^(-) RARR underset("Conjugate base of" OH^(-))(O^(2-) + H^(+))`.
Discussion
6857.

Which of the following statements is correct regarding chemical adsorption?

Answer»

It forms monolayer.
It is reversible in NATURE.
It OCCURS at LOW temperature.
It is not specific in nature.

ANSWER :A
Discussion
6858.

Which of the following satements is not correct?

Answer»

Proteins are polyamides FORMED from amino acids
Except glycine, all other amino acids show optical activity
Natural proteins are commonly made up of L - isomer of amino acids
In `alpha-` amino acids, `-NH_(2) and -COOH` groups are attached to DIFFERENT carbon atoms

Answer :D
Discussion
6859.

Which of the following antacids prevent the release of hydrochloric acid from the stomach wall?

Answer»

Ranitidine
Cimetidine
Omeprazole
All of these

Answer :D
Discussion
6860.

Which of the following are correct reactions ?

Answer»

`2Fe+Al_(2)O_(3) to 2Al+Fe_(2)O_(3)`
`ZnO+C to Zn +CO`
`Cr_(2)O_(3)+2Al to Al_(2)O_(3)+2Cr`
`2[AG(CN)_(2)]^(1-)+Zn to 2Ag +[Zn(CN)_(4)]^(2)`

SOLUTION :Except for (a) all other are correct reactions.
Discussion
6861.

Write the products in the following: CH_(3)CH_(2)CH_(2)OH underset("Alkali")overset(KMnO_(4))to

Answer»

SOLUTION :`CH_(3)-CH_(2)-COOH`
Discussion
6862.

What is electro-refining? Explain with the help of example.

Answer»

Solution :Metals like Cu, Ag, AU, Al are purified by ELECTROLYTIC refining. In this PROCESS, impure metal acts as anode and pure metal acts as CATHODE. Soluble salt of metal acts as electrolyte. When electric current is passed, impure metal changes into ions which are DEPOSITED at the cathode.
At anode : `Cu to Cu^(2+) + 2e^(-)`
At cathode : `Cu^(2+) +2e^(-) to Cu`.
Discussion
6863.

What is the other name of physical adsorption ?

Answer»

Chemisorption
Physiorption
PHYSISORPTION
None of above 

SOLUTION :Physisorption
Discussion
6864.

Which among the following compounds will give a secondary alcohol on reaction with Grignard reagent followed by acid hydrolysis?

Answer»

`(ii)`only
`(III)` only
`(i)` and `(iv)`
`(ii)` and `(iv)`

SOLUTION :The reaction of GRIGNARD reagent with HIGHER aldehyde and formic esters followed by acid hydrolysis yields secondary alcohols:
Discussion
6865.

What is the ratio of the energy yield on combustion of hydrogen atoms to steam to the yield on combustion of an equal mass of hydrogen molecules to steam ? Given , H_(2) (g) + (1)/(2) O_(2) (g) to H_(2) O (g) , Delta H= -242 kJ B.E. (H-H) = 436 kJ

Answer»

SOLUTION :`2.80 : 1`
Discussion
6866.

The standard reduction potentials of Cu^(2+)/Cu and Cu^(2+)/Cu^+ are 0.337 and 0.153 V respectively.The standard electrode potential of Cu^+/Cu half cell is :

Answer»

`0.184 V`
`0.827V`
`0.521V`
`0.490 V`

ANSWER :C
Discussion
6867.

When urea is heated, it forms biurete, alkaline solution of which forms. . . . With CuSO_(4) solution

Answer»

VIOLET colour
Red colour
Green colour
Black colour

Answer :A
Discussion
6868.

The vapour pressure of a solution prepared by dissolving 1 mol of liquid A and 2 mol of liquid B has been found to be 38 torr. The vapour pressure of pure A and pure B are 45 and 36 torr respectively. The solution

Answer»

shows negative deviation
is a minimum BOILING azeotrope
is an ideal solution
has A Hmixing positive

Solution :Accordingto Raoult.s law .
`p_(A)=x_(A) p_(A)^(@) = (1)/(3) xx 45 = 15` torr
`p_(B) = x_(B)p_(B)^(0) =(2)/(3) xx 36 = 24` torr
Total PRESSURE = 15+24=39 torr
The observed pressure is less than expected valueand hence it shows negative deviation.
Discussion
6869.

Wurtz reaction fails in case of tert-alkyl halides. Explain.

Answer»

Solution : tert-halides prefer to undergo dehydrohalogenation in presence of a strong base such as NA METAL instead of undergoing Wurtz reaction as EXPLAINED below:

Thus, only `1^(@) and 2^(@)` ALKYL halides undergo wurtz reaction whilee `3^(@)` alkyl halides prefer to undergo dehydrohalogenation to form alkenes.
Discussion
6870.

Which of the following is called invert sugar

Answer»

LACTOSE
sucrose
MALTOSE
GLUCOSE

ANSWER :B
Discussion
6871.

Which is the following is not ture for a lithium battery?

Answer»

Edison cell
Lead storage cell
`Ni-Cd` cell
All of these

Solution :Edison cell of Edison ACCUMULATOR is a nickel-iron accumulator, named after `T.A.` Edison `(1847-1931)`.
Lead storage cell (an automobile battery) can last fro several uears if precautions are taken. Its long life is based on the ability of the battery to funcation not only as agalvanic cell but also as an electrolytic cell. As a galvanic cell, the lead storage battery converts chemical energy into electrical energy. As an electrolytic cell, the battery converts electrical energy into chemical energy. The cycle can be repeated many times. When an automobile engine runs, it drives an electrical generator or alternator, a source of electrical current. This current FLOWS into the battery in a direction that reverses the two half-cell reactions and THUS the overall cell reaction. The direct conversion of chemical energy to electrical energy that takes place in galvanic cells is highly efficient, but it is also expensive. Fossil-fuel plants are only about `40%` efficient, which means that most of their energy is lost to the surroundings.
But even in the days of high energy prices, coal, OIL, and natural GAS are much cheaper that batteries are economically competitive only in specialized applications.
Discussion
6872.

Which metal is not silver white?

Answer»

Ni
Cu
Na
Sn

Answer :B
Discussion
6873.

What is dehydration of alcohols ? Give the chemical reaction showing dehydration of primary (1^(@)), secondary (2^(@)) and tertiary(3^(@))alcohols.

Answer»

<P>

Solution :Removal of water from an alcohol is called dehydration of alcohol. Alcohols having a `beta`-hydrogenis heated with DEHYDRATING agents like concentrated `H_(2)SO_(4) (or H_(3)PO_(4) or P_(2)O_(5) or Al_(2)O_(3)).` The ease of dehydration of alcohols is in the following order :
tert-alcohol `(3^(@))gt` SECONDARY `(2^(@)) gt` primary `(1^(@))`
(1) Primary `(1^(@))` alcohol is dehydrated by HEATING it with `95% H_(2)SO_(4)` at 443 K.
`H-underset("Ethanol")(underset(H)underset(|)overset(H)overset(alpha|)C-underset(OH)underset(|)overset(H)overset(beta|)C)-H underset(443K)overset(95%H_(2)SO_(4))to H-underset("Ethene") (overset(H)overset(|)C=overset(H)overset(|)C-H)+H_(2)O`
(2) Secondary alcohol `(2^(@))` is dehydrated by heating with `60% H_(2)SO_(4)` at373 K.
`H-underset("Propan-2-o1")(underset(H)underset(|)overset(H)overset(|)C-underset(OH)underset(|)overset(H)overset(|)C-underset(H)underset(|)overset(H)overset(|)C-H)underset(373K)overset(60%H_(2)SO_(4))to underset("Propene")(CH_(3)-CH)=CH_(2)+H_(2)O`

(3) A tertiary alcohol can be easily dehydrated by heating with `20% H_(2)SO_(4)`at 363 K.
`H-underset("2-Methylproan-2-o1")(underset(H)underset(|)overset(H)overset(beta|)C-underset(OH)underset(|)overset(CH)overset(alpha|)C-underset(H)underset(|)overset(H)overset(beta|)C-H) underset(363K)overset(20%H_(2)SO_(4))tounderset("Propene")(CH_(3)-overset(CH_(3))overset(|)C=CH_(2)+H_(2)O)`
Discussion
6874.

Which of the following postulates of kinetic molecular theory of gases is not correct ?

Answer»

Molecular collisions are perfectly elastic.
There are no forces of attraction or repulsion between molecules.
The molecules are in a state of rapid motion in all DIRECTIONS.
The average kinetic ENERGY of the gas molecules is inversely proportional to the absolute temperature.

ANSWER :D
Discussion
6875.

Which of the following gives blue colour with starch solution?

Answer»

`F_(2)`
`Cl_(2)`
`Br_(2)`
`I_(2)`.

Solution :Iodine gives BLUE COLOUR with STARCH solution.
Discussion
6876.

Which of the following reaction is correctly represented

Answer»




SOLUTION :The ether molecules gets protonated by the hydrogen of the ACID to form protonated ether or OXONIUM salt.

The protonated ether undergoes nucleophilic ATTACK by halide ion `(X^(-))` and forms alkyl alcohol alkyl halide
Discussion
6877.

XeF_4 has tetrahedral shape.is it true or false ?

Answer»

SOLUTION :SQUARE PLANAR
Discussion
6878.

Why are alcohols weaker acids than water?

Answer»

Solution :This because in alcohols, due to `+I-` effect of alkyl group, the electron around `O-` ATOM increases and LOSS of `H-` atom as PROTON BECOMES difficult as compared to in water.
`R rarr O-H hArr R-O^(-)+H^(+)H-O-HhArr HO^(-)+H^(+)`
Discussion
6879.

Write the structures of the following compounds (iii) 2-Hydroxycyclopentane carbaldehyde

Answer»


ANSWER :`(##ANE_PKE_CHE_XII_C12_E01_003_S01##)`
Discussion
6880.

When hydrogen and oxygen burn to from water in an oxyhydrogen torch, the entropy change is:

Answer»

Negative
Positive
Zero
may be +ve or -ve

Answer :A
Discussion
6881.

The statement which is not correct, is

Answer»

Chlorophyll is responsible for the synthesis of carbohydrate in plants
The COMPOUND formed by the ADDITION of oxygen to haemoglobin is called oxyhaemoglobin
Acetyl salicyclic acid is known as aspirin
The metal ion present in VITAMIN `B_(12)` is `Mg^(2+)`

Solution :Vitamin `B_(12)` or cyanocobalamine contains cobalt, not MAGNESIUM.
Discussion
6882.

Which of the following compound (s) is/are non-polar?

Answer»

`NO_(2)`
`B_(2)H_(6)`
`PF_(3)Cl_(2)`
`B_(3)N_(3)H_(6)`

Answer :B::D
Discussion
6883.

Which of the following emulsion will be favoured in the presence of Na-metal atom containing soap as an emulsifier ? (P) butter (Q) vanishing cream (R) milk (S) cold cream

Answer»

<P>R and S 
Q and R 
P and S 
only R 

SOLUTION :Q and R
Discussion
6884.

Which one favours the backward reaction in a comical equilibrium ?

Answer»

INCREASING the concentration of ONE of the reactants.
Removal of at LEAST one of the products at REGULAR interval.
Increasing the concentration of one or more of the products.
None of the above.

ANSWER :C
Discussion
6885.

When 1 L of a saturated solution of PbCI_2, is evaporated to dryness, the residue is found to weigh 4.5 g. What will be the K_(sp) for PbCl_2?

Answer»

`1.70 XX 10^(-5) `
`2.70 xx 10^(-6)`
`3.20 xx 10^(-5)`
`1.80 xx 10^(-6)`

Solution :LETUS supposethe solubilityof `PbCI_2 ` beS mol /L
` PbCI_2 hArrpB^(2+) +2CI^-`
` thereforek_(sp )= [Pb^(2+) + 2CI^(-)`
` thereforeK_(sp )= [Pb^(2+)][CI^(-)]^2 =S xx (2S)^2 =4S^2`
Solubility`=4.5g//lit =(4.5 ) /( 278 )= 1.62 xx 10^(-2)` Mol / lit
( molarmassof`PbCI_2 =278` )
` thereforeK_(sp ) = 4 xx ( 1.62 xx 10^(-2))^3`
` or K_(sp )= 1.70 xx 10^(-5)`
Discussion
6886.

Which of the following is likely to have higher boiling point

Answer»

`CH_(3)CH_(2)CH_(2)NH_(2)`
`(C_(2)H_(5))_(2)NH`
`CH_(3)CH_(2)N(CH_(3))_(2)`
`CH_(3)CH_(2)CH_(2)NHCH_(3)`

Solution :BRANCHES `uarr` b.p `DARR`
Discussion
6887.

The resistance of a 0-2 N solution of an electrolyte in a conductivity cell (cell constant 2.06cm^(-1)) is 100 ohm at 298 K. What are its conductivity and equivalent conductance ?

Answer»

Solution :Conductivity (k) `=("Cell constant")/("Resistance")`
Cell constant `=2.06cm^(-1),R=100Omega`
`k=(2.06)/(100)=2.06xx10^(-2)Omega^(-1)CM^(-1)`
Equivalent CONDUCTANCE,
`Delta=(100xxk)/(C)andC=0.2` g equiv / litre.
`Delta=(1000xx2.06xx10^(-2))/(0.2)`
`=103Omega^(-1)cm^(2)` gram `"equiv"^(-1)`
Discussion
6888.

Which one of the following is NOT correctly matched ?

Answer»

`-OVERSET(o+)NH_3`, META director
`CH_3-O-UNDERSET(OCH_3)underset(|)overset(O)overset(||)P-O`, meta director
meta director
`-CH_3` , meta direction

Answer :D
Discussion
6889.

Which among the following reactions will not result in the formation of carbon - carbon bond? _______.

Answer»

FRIEDEL Crafts
Cannizaro reaction
Riemer - Tiemann
none of the above

Answer :B
Discussion
6890.

Which element among the Lanthanides has the smallest atomic radius ?

Answer»

CERIUM
LUTETIUM
EUROPIUM
Gadolinium.

Answer :B
Discussion
6891.

When a large amount of KMnO_4 is added to concentrated H_2SO_4, an explosive compound is formed. The formula of the compound is

Answer»

`Mn_2O_7`
`Mn_3O_4`
`MnO_3`
`MnO_3^+`

ANSWER :A
Discussion
6892.

Which has the larger bond angle H_2S or H_2O and why ?

Answer»

Solution :`H_2O` has LARGER angle than `H_2S` because of smaller SIZE of oxygen. There will be GREATER bond PAIR-bond pair repulsion in `H_2O` than in `H_2S`.
Discussion
6893.

When an ideal binary solution is in equilibrium with its vapour, molar ratio of the two components in the solution and in the vapour phase is:

Answer»

Same
Different
MAY or may not be same depending UPON VOLATILE nature of the TWO components
All

Answer :C
Discussion
6894.

Which of the following option is incorrect with respect to ionic radii ?

Answer»

`Ti^(4+) lt Mn^(2+)`
`.^(35)CL^(-) lt^(37)Cl^(-)`
`K^(+) gt Cl^(-)`
`P^(3+) lt P^(5+)`

SOLUTION :`P^(5+)` has more effective NUCLEAR charge and smaller size than `P^(3+)`
Discussion
6895.

What advantage the osmotic pressure method has over the other colligative methods for the determination of molecular mass of macro molecules?

Answer»

SOLUTION :Stability of MACROMOLECULES depends upon the temperature. The osmotic PRESSURE methods had the advantage over otther methods as pressure measurement is around the ROOM temperature.
Discussion
6896.

Three footballs are respectively filled with nitrogen, hydrogen and helium. In what order are these footballs to be reinflated ?

Answer»

Solution :Since `R PROP (1)/(SQRT(M))`
`r_(H_(2)) gt r_(He) gt r_(N_(2)` as`M_(N_(2)) gt M_(He) gt M_(H_(2))`
Thus the footballs are to be INFLATED in the following order :
(i) `H_(2)` - filled ball (ii) He -filled ball (iii) `N_(2)` - filled ball.
Discussion
6897.

Which of the following is an example of super octet molecule ?

Answer»

`ClF_(3)`
`PCl_(5)`
`IF_(7)`
All the three

Answer :D
Discussion
6898.

Which of the following processes result in an increase in the atomic number of a nuclide?

Answer»

`ALPHA`-EMISSION
electron CAPTURE
`GAMMA`-emission
`BETA`-(Beta) emission

Answer :D
Discussion
6899.

Which of the following alkenes is most reactive towards cationic polymerization?

Answer»

a. `CH_(2)=CHCH_(3) `
b. `CH_(2)=CHCl `
c. `CH_(2)=CHC_(6)H_(5)`
d. `CH_(2)=CHCOOCH_(3)`

Solution :In cationic polymerisation , carbocations are formed. Greater the stability of the carbocation ,more reactive is the alkene. Since the stability of the intermediate cabocation follows the ORDER :`CH_(3)-OVERSET(+)CH_(6)H_(5) gt CH_(3) overset(+)CH_(3 ) gt CH_(3)overset(+)(C)HCl gt CH_(3)overset(+)CHCOOCH_(3)`therefore , reactivity decreases in the same order. Thus, styrene is mots reactive.
Discussion
6900.

The solution of which of the following will be non - conducting ?

Answer»




ANSWER :C
Discussion