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6351.

Which one of the following is used in the preparation of Artificial fruit essences?

Answer»

ETHANOIC acid
Acetamide
ETHYL ACETATE
ACETIC anhydride

Solution :Ethyl acetate
Discussion
6352.

Write the short note on anamolous properties of the first element of p - block.

Answer»

Solution :Anamolous properties of the first element of p - block : In p - block ELEMENTS, the first MEMBER of each GROUP differs from the other elements of the corresponding group. The following factors are responsible for the anomalous behaviour.
(i) Small size of the member.
(ii) High ionisation enthalpy and high ELECTRONEGATIVITY.
(iii) Absence of d - orbitals in their VALANCE shell
Discussion
6353.

The vapour density of a gas is 11.2 The volume occupied by11.2 g of rhe gas at NTP is :

Answer»

1 litre
11.2 litre
22.4 litre
4.8 litre

Answer :B
Discussion
6354.

Write the products of the following reactions : (i) (ii) 2C_(6)H_(5)CHO+underset("Conc".)(NaOH)to. (iii) CH_(3)COOH overset(CI_(2)//P)to.

Answer»

SOLUTION :(i)
(II) `CI-CH_(2)COOH`.
Discussion
6355.

Which of the following will increase the voltage of the cell? Sn(s) ^(+) 2Ag^(+) (aq) rarr Sn^(2+) (aq) +2 Ag(s)

Answer»

Increase in the CONCENTRATION of `Sn^(2+)` ions
Increase in the concentration of `Ag^(+)` ions
Increase in the size of silver rod
Decrease in SURFACE AREA of tin rod

Answer :B
Discussion
6356.

Which of the following aqueous solutions has pH greater than 7 ?

Answer»

`CuSO_(4)`
`FeCl_(3)`
NACL
`CH_(3)COONA`

Answer :D
Discussion
6357.

Write the formula of the volatile compound formed during the purification of nickel by Mond's process.

Answer»

SOLUTION :`[NI(CO)_(4)]` is the formula of the volatile COMPOUND formed during the purification of NICKEL by monds process
Discussion
6358.

Which of the following has highest mass

Answer»

2 G atom of C
2 mol of `CH_(4)`
20 ML water
5 mol of `O_(2)` gas

Answer :D
Discussion
6359.

The reagents to carry out the following conversion are

Answer»

`HgSO_(4) // dil.H_(2)SO_(4)`
`BH_(3), H_(2)O_(2) // NAOH`
`OsO_(4), HIO_(4)`
`NaNH_(2) // CH_(3)I, HgSO_(4) // dil.H_(2)SO_(4)`

Solution :
`NH_(2)^(-)` which is a strong base will ABSTRACT the acidic hydrogen.
Discussion
6360.

Which of the following hydrogen bonds are strogent in vapour phase

Answer»

HF---HF
HF---HCl
HCl---HCl
HF---HI

Solution :A COMPOUND having maximum ELECTRONEGATIVITY ELEMENT will form STRONG hydrogen bond.
Discussion
6361.

Which of the following compound does not give Hoffman's carbylamine test?

Answer»




ANSWER :A
Discussion
6362.

Which of the following statement(s) is/are correct about slag?

Answer»

The chemical composition of slag obtained in the extraction of COPPER from copper pyrites is `PbSiO_(3)` .
The CALCIUM silicate , `CaSiO_(3)` is obtained is slag formation zone in the extraction zone in the extraction of iron from haemattie ore.
In blast furnace/Bessemer converter , the upper layer of molten liquid (i.e. molten metal is of slag.
The slag is FUSIBLE matter

Answer :B::C::D
Discussion
6363.

Yellow ammonium salphide solution is a sulable resgent used for the sepuration of

Answer»

`HgS` and `PBS`
`PbS` and `Bi_(2)S_(3)`
`Bi_(2)S_(3)` and `CuS`
`CdS` and `As_(2)S_(3)`

Solution :`As_(2)S_(3)` is SOLUBLE in YELLOW ammonium SULPHIDE
Discussion
6364.

Which one of these is not compatible with arenes

Answer»

Greater STABILITY
Delocalisation of `pi`-electrons
Electrophilic addition
Resonance

Solution :In arenes electrophilic substitution reaction takes place and it does not give electrophilic addition reactions. We also know that BENZENE is a resonance hybrid of two STRUCTURES and greater stability of benzene is due to DELOCALIZATION of `pi` electron
Discussion
6365.

When solid potassium cyanide is added in water then………

Answer»

PH will increase
pH will decrease
pH will REMAINS the same
electricity CONDUCTIVITY will not change

Solution :`KCN+H_2O leftrightarrow KOH+HCN`.
KOH is a strong base and HCN is a WEAK acid. SO pH will increase.
Discussion
6366.

Which one of the following is the most aboudant element in the universe

Answer»

Nitrogen
Hydrogen
Oxygen
Silicon

Answer :B
Discussion
6367.

Which of the following is not used in Friedel-Crafts reaction?

Answer»

N-Phenyl accetanilide
Bromobenzene
Benzene
Chlorobenzene

Answer :A
Discussion
6368.

The relative lowering of vapour pressure produced by dissolving 71.5 g of a substance in 1000 g of water is 0.00713. The molecular weight of the substance will be:

Answer»

180
18
342
60

Answer :A
Discussion
6369.

Which of following solutions acts as disinfectant ?

Answer»

AQUEOUS SOLUTION containing `1%` of phenol
Aqueous solution containing `0.2%` phenol.
Aqueous solution containing `2-3%` of iodine.
Dilute aqueous solution of BORIC ACID. 

Solution :Aqueous solution containing `1%` of phenol
Discussion
6370.

The van der waals forces in halogen decrease in the order

Answer»

`F_2gtCl_2gtBr_2gtI_2`
`I_2gtBr_2gtCl_2gtF_2`
`Br_2gtCl_2gtF_2gtI_2`
`Cl_2gtBr_2gtI_2gtF_2`

ANSWER :B
Discussion
6371.

Which of the following reactions will give propane ?

Answer»

`CH_3 CH_2 CH_2 Cl overset("Mg/ether") underset(H_2O)(to)`
`CH_3 COCl overset(CH_3 Mg X)underset(H_(2)O)(to) `
`CH_(3) CH = CH_(2) overset(B_2 H_6)underset(CH_3COOH)(to)`
`CH_3 underset(OH)underset(|)(C)H- CH_(3) overset(P//HI)(to)`

SOLUTION :With calculated amount of Grignard reagent , acetyl chloride forms KETONES .
`CH_3 COCl + X Mg CH_3 to CH_3 COCH_3 + (##MTG_WB_JEE_CHE_C22_E01_051_S01.png" WIDTH="80%">
Discussion
6372.

Write two uses of xenon tetrafluoride.

Answer»

SOLUTION :USED as OXIDISING AGENT
Used as a fluorinating agent for organic COMPOUNDS.
Discussion
6373.

Which among the following carbonates is thermally least stable?

Answer»

`K_2CO_3`
`Li_2CO_3`
`Na_2CO_3`
`Rb_2CO_3`

ANSWER :B
Discussion
6374.

Which is maximum hydrated-

Answer»

`NaCl`
`MgCl_(2)`
`AlCl_(3)`
`SiCl_(4)`

ANSWER :C
Discussion
6375.

Which of the following has minimum flocculation value

Answer»

`PB^(2+)`
`Pb^(4+)`
`SR^(2+)`
`Na^(+)`

Answer :B
Discussion
6376.

What are biodegradable and non-biodegradable detergents ? What are the consequences of using latter class of detergents ?

Answer»

Solution :Biodegradable detergents are those detergents which are decomposed by microorganisms into harmless PRODUCTS. They do not create water pollution. Detergents having linear ALKYL CHAINS are biodegradable. Non-biodegradable detergents are those which are not decomposed by microorganisms in the environment. They create water pollution. For example, n-lauryl sulphonate is biodegradable WHEREAS detergent with branched chains are non-biodegradable.
Discussion
6377.

Vitamin 'C' belongs to the class of -

Answer»

VITAMINS of aliphatic SERIES
Vitamins of alicyclic series
Vitamins of armoatic series
vitamins of hetyrocyclic series

Solution :VITAMIN C BELONGS to the class of vitamins is 2aminobutanoic ACID
Discussion
6378.

What will be the volume of 12 M solutions, if it is equivalent to 240 mL of 18 M solution?

Answer»

6 LITRE
600 litre
400 litre
0.36 litre

Solution :`N_(1)V_(1)=N_(2)V_(2)` or `M_(1)V_(1)=M_(2)V_(2)`
`therefore12xxV_(1)=18xx240`
`V_(1)=(18xx240)/(12)=360ml=0.36` litre
Discussion
6379.

Which of the following on hydrolysis will give a product with specifice rotation of +52.7^(@) ?

Answer»

maltose
cellobiose
SUCROSE
cellulose

Solution :On hydrolysis (a), (b) and (d) all give equilibrium mixture of `alpha`-D-glucose,`BETA`-D-glucose and open chain D-glucose with sp.ROTATION `+52.7^(@)` whereas sucrose give equimolar mixture of D-glucose and D-fructose with sp. Rotation `-20^(@)`.
Discussion
6380.

Which one of the following correctly defines the state of glass ?

Answer»

CRYSTALLINE solid
Super cooled liquid
CONDENSED gas
Liquid crystal

SOLUTION :Glass is an AMORPHOUS, hard, BRITTLE, super cooled liquid.
Discussion
6381.

Which of the following does not exist as a zwitter ion?

Answer»

GLYCINE
Alanine
Sulphanilic acid
p-Aminobenzoic acid

Solution :In p-aminobenzoic acid (PABA), the lone PAIR of electrons on the `NH_(2)` group is donated towards the benzene ring. As a result, acidic character ofCOOH group and basic character of NH group decreases. Therefore, the weakly acidic COOH group cannot, transfer a `H^(+)` ion to the weakly basic -`-NH_(2)` group. As a result, PABA does not exist as a zwitter ion.
In contrast, in sulphanilic acid, `SO_(3)H` group being a much STRONGER acidic group than COOH group donates a proton to weakly basic `- NH_(2)` group to form a zwitter ion.

In glycine and alanine, no such electron withdrawing benzene ring is present. As a result, -`NH_(2)` group is sufficiently basic and HENCE accepts a proton from --COOH group to form a zwitter ion.
`H_(2) N - CHR - COOH to H_(3)overset(+)(N) - CHR - COO^(-)`
Discussion
6382.

The resistance of a conductivity cell containing 0.001M KCl solution at 298K is 1500Omega .What is the cell constant (inmm^(-1)). If the conductivity of 0.001 M KCl solution is 2 xx 10^(-3) S mm^(-1)

Answer»


SOLUTION :`R = S .(1)/(a) , 1500 = S. (1)/(a)`
CELL CONSTANT = `(1)/(a) = (1)/(5) xx 1500 = 2 xx 10^(-3) xx 1500 = 300 xx 10^(-3) =3 `
Discussion
6383.

Which among the following is most stable carbonation

Answer»

ISO - propyl
Triphenylmethyl CATION
ETHYL cation
t - BUTYL cation

Answer :B
Discussion
6384.

Which one of the following is formed when diethyl ether reacts with Cl_2 in the presence of light?

Answer»

`CH_3 -UNDERSET(CL)underset(|)CH-O -underset(Cl) underset(|)CH = CH_3`
`C Cl_3 - CH_2 - O - CH_2 - C Cl_3`
`C Cl_3 C Cl_2 - O - C Cl_2 - C Cl_3`
`C_2H_5-O-C_2Cl_5`

SOLUTION :`C Cl_3 C Cl_2 - O - C Cl_2 - C Cl_3`
Discussion
6385.

Which ohn oxidation will not give a carboxylic acid with the same number of carbon atoms :

Answer»

`CH_(3)COCH_(3)`
`"CCl"_(3) CH_(2)`CHO
`CH_(3) CH_(2) CH_(2) OH`
`CH_(2) CH_(2) `CHO

SOLUTION :`CH_(3) - overset(O)overset(||)(C ) - CH_(3) underset("OXIDATION")(rarr) CH_(3). "COOH" + "HCOOHHCOOH" rarr CO_(2) + H_(2) O `
Discussion
6386.

Which sulphides are soluble in only aquaregia:

Answer»

NiS
CoS
HgS
All of these

Answer :D
Discussion
6387.

When photons of energy 4.25 eV strike the surface of a metal A, the ejected photoelectrons have maximum kinetic energy lamda_(A). The maximum kinetic energy of photoelectrons liberated from another metal B by photons of energy 4.70 eV is T_(B)=(T_(A) -1.50) eV. If the de Broglie wavelength of these photoelectrons is lamda_(B)=2lamda_(A), then select the correct statement statement (s)

Answer»


ANSWER :`A=2.25eV,B=4.20 EV, T_(A)=2.00eV.`
Discussion
6388.

Vitamin B_6 is known as

Answer»

Pyridoxine
THIAMINE
Tocopherol
RIBOFLAVIN

Solution :Vitatmin `B_6` is called pyridoxine. It is FOUND in fruits, green-vegetables, milk, etc. Due to its deficiency, anaemia disease is caused.
Discussion
6389.

Which one has the highest coagulating power for ferric hydroxide sol ?

Answer»

KCL
`K_2SO_4`
`Na_3PO_4`
NaCl

Answer :B
Discussion
6390.

Which of the following apparatus is used to decide positive or negative electric charge of colloid ?

Answer»

ULTRACENTRIFUGE 
ELECTROPHORESIS 
Ultrafilter PAPER 
MECHANICAL dispersor 

SOLUTION :Electrophoresis
Discussion
6391.

Which of the following halogens can replace other from their salt solutions

Answer»

`I_2`
`Br_2`
`F_2`
`Cl_2`

ANSWER :C
Discussion
6392.

Which of the following is not a tranguilizer?

Answer»

BARBITURIC ACID
SECOND
LUMINAL
Phenactin

Answer :D
Discussion
6393.

When a metal is burnt in oxygen, its weight is increased by 24 per cent. The equivalent weight of the metal will be

Answer»

120
80
60
40

Solution :If MASS of metal is 100 g, then mass of metal oxide formed = 120 g
`("Mass of metal")/("Mass of metal oxide")=("Eq. WT. of metal")/("Eq. wt. of metal oxide")`
`(100)/(120)=(E)/(E+8)"or"10E+80=12E`
`"or2 E = 80orE = 40"`
Discussion
6394.

The resistance of 0.1 N solution of acetic acid is 250 ohm , when measured in cell of cell constant 1.15 cm^(-1) . The equivalent conductance (in ohm^(-1) cm^(2) "equiv"^(-1)) of 0.1 N acetic acid is :

Answer»

46
9.2
18.4
0.023

Answer :A
Discussion
6395.

Which of the following shows maximum molar conductance

Answer»

`[Co(NH_(3))_(6)]Cl_(3)`
`[Co(NH_(3))_(3)Cl_(3)]`
`[Co(NH_(3))_(4)Cl_(2)]Cl`
`[Co(NH_(3))_(5)Cl]Cl_(2)`

Solution :Molar CONDUCTANCE `prop` no. of ions
Discussion
6396.

The vapour presssures of pure benzene and toluene are 160 and 60 mm Hg respectively. The mole fraction of benzene in vapour phase in contact with equimolar solution of benzene and toluene is

Answer»

0.5
`8//3`
0.73
0.72

Answer :C
Discussion
6397.

Which of the following is a regenerated fibre?

Answer»

Nylon-6
Terylene
Nylon-66
Acetate rayon

Answer :A::C::D
Discussion
6398.

The value of A in Debye-Huckel and Onsager equation is ……………. .

Answer»

`A = (8.20 xx 10^5)/(3sqrt(DT))`
`A = (8.20 xx 10^(-5))/(sqrt(DT))`
`A = (82.4)/(sqrt(DT)eta)`
`A = (82.4)/(3sqrt(DT))`

Answer :C
Discussion
6399.

Which of the following is not the male sex hormone-

Answer»

testosterone
dihydrotestosterone
androgens
estrogens

Answer :D
Discussion
6400.

Write the structure of the product when chlorobenzene is treated with methyl chloride in the presence of sodium metal and dry ether.

Answer»

SOLUTION :
Discussion