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1351.

Which of the following forms interestitial compounds(s)?

Answer»

Fe
Ni
Co
None to these

Solution :d-block ELEMENTS FORMS Intenstial COMPUNDS
Discussion
1352.

Which of the following is a lanthanide element?

Answer»

Ac
As
Nd
Pd

Answer :C
Discussion
1353.

Which one of the following metals could not be obtained on electrolysis of aqueous solution of its salts

Answer»

`AG`
`MG`
`Cu`
`CR`

Solution :The reduction potential of Mgis less than that of water `(E^(o)=-0.83V)`. Hence their ions in the aqueous solution cannot be REDUCED instead water will be reduced.
`2H_(2)O+2e^(-)toH_(2)+2OH^(-)`.
Discussion
1354.

Which pair of atoms form strongest ionic bond ?

Answer»

AL and As
Al and N
Al and Se
Al and O

Solution :Among given non-metals, O-atom has high electron affinity and strong ionic bond is FORMED between Al and O-atom.
Discussion
1355.

Vicinal and gem dihalides can be distinguished by

Answer»

aq. KOH<BR>Zn dust
alc. KOH
`Br_(2)` water

Solution :`underset("Vicinal")(CLCH)=CHCl+aq.KOHrarrunderset("vicinal ALCOHOL")(HOCH=CHOH)`
Discussion
1356.

Two colourless gas A and B are enclosed in two separate jars. When passed through acidified K_(2)Cr_(2)O_(7) solution, turn the solution green. But gas A turns lead acetate paper black whereas if both the gases are passed into water, the solution develops a yellowish white turbidity. Identify the gases A and B and write balanced equations for the chemical reactions taking place.

Answer»

Solution :As both gases are colourless and each of these turns acidified `K_(2)Cr_(2)O_(7)` solutiongreen, the gases expected are `H_(2)S` and `SO_(2)` . Further, as gas A turns lead acetate paper black, it must be `H_(2)S`
`underset("(Gas A)") (H_(2)S) + (CH_(3)COO)_(2)Pb rarr underset("(Black ppt.)")(PBS) + 2CH_(3)COOH`
`H_(2)S` and `SO_(2)` together in AQUEOUS solution REACT to produce S which gives a yellowish WHITE turbidity
`underset("(Gas A)")(2H_(2)S)+ underset("(Gas B )")(SO_(2))rarr 2H_(2)O + underset("(Yellowish turbidity)")(3S)`
Discussion
1357.

There are two statement of same gas initially under similar initial state. Gases of both the samples are expanded. I^(st) sample using reversible isothermal process and II^(nd) sample using reversible adiabatic process till final pressure of both the samples becomes half of initial pressure. Then:

Answer»

Final volume of `I^(st)` sample `LT` final volume of `II^(nd)` sample
Final volume of `II^(nd)` sample `GT` work by gas in `I^(st)` sample
Final VOLUMES will be equal
Information is insufficient

Solution :N//A
Discussion
1358.

Which of the following is most reactive towards aqueous HBr?

Answer»

1-phenyl-1-propanol
1-Phenyl-2-propanol
3-Phenylo-1-propanol
All are equally REACTIVE

Solution :Here also, CARBOCATION is formed as an intermediate, hence the SPECIES CAPABLE of forming most STABLE carbocation ..,viii be most reactive.
Discussion
1359.

The reduction potential of NCE at 298 K is

Answer»

0.3338 V
0.2415 V
0.28 V
0.76 V

Solution :NCE =1 NORMAL CALOMEL ELECTRODE.
Discussion
1360.

What mass of sodium chloride would be decomposed by 9.8 g of sulphuric acid. If 12 g of sodium bisulphate and 2.75 g of hydrogen chloride were produced in a reaction assuming aht the law of conservation of mass is true?

Answer»

Solution :`NACL+H_(2)SO_(4)=NaHSO_(4)+HCl`
ACCORDING to law of conservation of mass.
TOTAL masses of reactants =Total masses of products
Let the mass of NaCl decomposed be xg, so
`x+9.8=12.0+2.75=14.75
x=4.95g
Discussion
1361.

Which of the following metals can be seperated from their crude form by liquation ?

Answer»

Bi
Ge
Ni
All of these

Answer :A
Discussion
1362.

What is saponification with an example.

Answer»

Solution :Soaps are prepared by heating a FAT or oil with AQUEOUS NAOH or KOH solution. This reactinn is called saponification.
Discussion
1363.

Which molecule is T shaped ?

Answer»

`BeF_2 `
`BCl_3 `
`NH_3 `
`ClF_3`

ANSWER :D
Discussion
1364.

What are the monomers of the following? Neoprene

Answer»

SOLUTION :CHLOROPRENE
Discussion
1365.

Which one of the following is an example for atomic solids ?

Answer»

Frozen ELEMENTS of group 18
Group 17 elements
INNER - transition elements
chalcogens

SOLUTION :Frozen elements of group 18
Discussion
1366.

Write the structural formula and IUPAC names of : (i). Secondary dutyl chloride (ii) allyl chloride (iii). BHC (iv). Isobutyl chloride (v). Cinnamyl chloride (vi). Crotyl chloride (vii). Propargyl bromide.

Answer»

Solution :(i). `CH_(3)-underset(Cl)underset(|)(C)H-C_(2)H_(5)` (2-chlorobutane)
(ii). `CH_(2)=CH-CH_(2)-Cl` (3-Chloropropi-1-ene)
(III).
(iv). `underset("1-Chloro-2-methylpropane")(CH_(3)-underset(CH_(3))underset(|)(C)H-CH_(2)-Cl)`.
(v). `C_(6)H_(5)CH=CHCH_(2)Cl` (3-Chloro-1-phenyl-prop-1-ene)
(vi). `CH_(3)-CH=CH-CH_(2)-CL` (1-Chlorobut-2-ene).
(vii). `overset(1)(C)H-=overset(2)(C)H-overset(3)(C)H_(2)-Br` (3-Bromoprop-1-yne).
Discussion
1367.

The variation of heat of reaction with temperature is given by an equation known as

Answer»

Van't HOFF equation
Van DER WAALS equation
Kirchoff's equation
Gibbs Helmholtz equation.

Answer :C
Discussion
1368.

Write the chemical reaction to effect the transformation of sodium acetate to ethane.

Answer»


ANSWER :By KOLBES ELECTROLYSIS
`2CH_3COONa+2H_2O OVERSET(electrolysis)CH_3-CH_3+2NaOH+2CO_2+H_2`
Discussion
1369.

Which of the following exhibits linkage isomerism ?

Answer»

`[Co(NH_3)_5SO_4]BR`
`[CO(H_2O)_6]Cl_3`
`[CO(NH_3)_5(NO_2)]Cl_2`
`[CO(NH_3)_6][CR(CN)_6]`

Answer :C
Discussion
1370.

Which of the following cannot be made by reduction of ketone or aldehyde with NaBH_(4) in methanol?

Answer»

1-butanol
2-butanol
1-methyl-1-propanol
2-methyl-2-propanol

Solution :2-methyl-2-propanol is`C(CH_(3))_(3)OH`. It cannot be obtained by reduction of an aldehyde or KETONE with `NaBH_(4)`
Discussion
1371.

Which of the following solutions have different pH? 100mL" of "0.2m" "HCl +100mL" of "0.4 M" "NH_(3) 50mL" of "0.1 M" HCl +"50mL" of "03.2 M NH(3) 10 mL of 0.3" M "HCl +100mL of 0.6 M NH_(3)

Answer»

I &ii
ii & iii
I & iii
all will have same `PH`.

Solution :(a) `{:(NH_(4)OH,+,HCl,rarr,NH_(4)Cl,+,H_(2)O),(0.2M,,0.1,,0.1,,0),(0.1,,0,,0.1,,0.1):}`
`pOH=pK_(b)`
(b) `{:(NH_(4)OH,+,HCl,rarr,NH_(4)Cl,+,H_(2)O),(0.1M,,0.05,,0,,0),(0.05,,0,,0.05,,):}`
`pOH=pK_(b)+log(((0.05)/(0.05)))=pK_(b)`
c `{:(NH_(4)OH,+,HCl,rarr,NH_(4)Cl,+,H_(2)O),(0.3,,0.15,,,,),(0.15,,0,,0.15,,):}`
`pOH=pK_(b)` so all solution have same `pH`.
Discussion
1372.

Write the reagents for the following conversions : Benzene to m-bromophenol

Answer»

SOLUTION :
Discussion
1373.

Which one of the following structures is indicative of meridonial isomer ?

Answer»




ANSWER :C
Discussion
1374.

The structural formula of the compound isomeric with acetone is

Answer»

`CH_(3)CH_(2)CHO`
`CH_(3)CHO`
`CH_(3)CH_(2)OH`
NONE of these

Answer :A
Discussion
1375.

When Cl_(2) gas reacts with hot and concentrated sodium hydroxide solution, the oxidation number of chlorine changes from

Answer»

zero to +1 and zero to +5
zero to -1 and zero to +5
zero to -1 and zero to +3
zero to +1 and zero to -3

Solution :`3overset(0)(Cl_(2)) + 6 NAOH (conc.) overset(Delta)rarr 5 Naoverset(-1)(CL) + Naoverset(+5)(ClO_(3))+ 3H_(2)O`
Here, O.N. of Cl changes from 0 in `Cl_(2)` to -1 in NaCl and from 0 in `Cl_(2)` to +5 in `NaClO_(3)`.
Discussion
1376.

What is lead storage battery?

Answer»

`SO_2` is evolved
Lead is formed
Lead SULPHATE is consumed
Suophuric ACID is consumed

Answer :D
Discussion
1377.

Vapour pressure of pure components A and B 120 mm and 96 mm of Hg respectivly. What will be total pressure when the solution contains 1 mole of component A and 4 moles of component B if the solution is ideal ?

Answer»


SOLUTION :`n_(A)=1,n_(B)=4, x_(A)=n_(A)/(n_(A)+n_(B))=1/(1+4)=0.2, x_(B)=1-0.2=0.8`
`"Vapoure pressure of A in solution "(P_(A))=P_(A)^(@)x_(A)=(120mm)xx0.2=24mm`
`"Vapoure pressure of B in solution "(P_(B))=P_(B)^(@)x_(B)=(96mm)xx0.8=100.8mm.`
`"VAPOUR pressure of soluiton P= P+_(A)P_(B)=(24+78.8)=100.8 mm.`
Discussion
1378.

Which of the following characteristic features match(es) with the crystal systems: simple cubic and face centred cubic?

Answer»

Both have the cell PARAMETERS a = B = c and `alpha=beta=gamma`
Both BELONG to different crystal systems
Both have only two CRYSTALLOGRAPHIC angles of `90^(@)`
Both belong to same crystal system

Answer :A::D
Discussion
1379.

Which of the following are correct about [Cu(NH_(3))_(4)]SO_(4) ?

Answer»

It is a square planar complex
It is paramagnetic with one unpaired electron in the d- subshell
It gives WHITE precipitate with `BaCl_(2)` solution
Its AQUEOUS solution does not conduct ELECTRICITY.

Solution :is wrong BECAUE the unpaired electron is present in 4p subshell.
is wrong because it gives ions in the solution and hence can conduct electricity.
Discussion
1380.

Write the best reagents above each reaction arrow. If the transformation cannot be achieved in a single step by any reagents, write "NR"

Answer»

SOLUTION :
Acidic `CR^(6+)` reagents convert PRIMARY alcohols into car boxylic acids.
Discussion
1381.

Write the best reagents above each reaction arrow. If the transformation cannot be achieved in a single step by any reagents, write "NR"

Answer»

SOLUTION :
Aqueous HBr MAY react involving a carbocation mechanism, THUS ALLOWING undesirable rearrangements.
Discussion
1382.

Write the best reagents above each reaction arrow. If the transformation cannot be achieved in a single step by any reagents, write "NR"

Answer»

SOLUTION :
WILLIAMSON ETHER SYNTHESIS
Discussion
1383.

Write the names of A and B?

Answer»


ANSWER :A.Hexagonal CLOSE PACKING.
B.Square close packing.
Discussion
1384.

What are the uses of Potassium permanganate?

Answer»

SOLUTION :Potassium PERMANGANATE is used,
(i) as a strong oxidising agent.
(ii) for the treatment of various skin infections and fungal infections of foot.
(iii) used in water treatment industries to remove IRON and hydrogen sulphide from WELL water.
(iv) as a Baeyer.s reagent for detecting unsaturation in an organic compound.
(v) in quantitative analysis for the estimation of ferrous salts, oxalates, hydrogen peroxide `(H_(2)O_(2))` and iodides.
Discussion
1385.

Which of the following weighs the least ?

Answer»

2 GRAM atoms of N
`3 xx 10^23`atoms of C
20 G of `CO_2`
1 MOLE of `SO_2`

Solution : `3 xx 10^23`atoms of C
Discussion
1386.

Write the slope value obtained in the plot of ln[R] us time for a first order reaction.

Answer»

SOLUTION :SLOPE VALUE = -K
Discussion
1387.

Which factor imparts crystalline nature to a particle like nylon ?

Answer»

Solution :Strong intermolecular FORCES like hydrogen bonding LEAD to close packing of CHAINS that impart crystalline NATURE to nylon.
Discussion
1388.

What is the relationship between molar mass and electro chemical equivalent. Derive the equation.

Answer»

SOLUTION :(i) Consider the following general electro chemical redox reaction
`M^(n+)(aq) + n e^(-) to M_((s))`
(II) We can infer from the above equation that .n. moles of electrons are required to precipitate 1 mole of `M^(n+)` as `M_((s)).`
(iii) The quantity of CHARGE required to precipitate 1 mole of `M^(n+)`
= Charge of .n. moles of electrons = nF
(IV) In other words, the mass of the substance deposited by one couloumb of charge
Electro chemical EQUIVALENT `M^(n+) = ("Molar mass (M)")/(n(96500))` (or)
`Z = ("Equivalent mass")/(96500)`.
Discussion
1389.

Which of thefollowingstatements is correctwhenSO_(2) is passedthroughacidified K_(2) Cr_(2) O_(7) solution ?

Answer»

Thesolutionturnsblue
the solutionis DECOLOURIZED
GREEN `Cr_(2) (SO)_(4)` is FORMED
`SO_(2)` isreduced

Answer :C
Discussion
1390.

Which represents the correct set of four quantum number of a 4d-electron:

Answer»

4, 3, 2, +1/2
4, 2, 1, 0
4, 3, -2, +1/2
4, 2, 1,+1/2

Answer :D
Discussion
1391.

Which of the following sequence of reagents is a good means lo furnish the conversion? RCH_(2)OH rarr RCH_(2)NH_(2)

Answer»

`KMnO_(4), SOCI_(2), NH_(3),`HEAT , Obr
`PBr_(3), NaCN,H_(2),Ni`
Collin's reagent ,` NH_(3): H_(2): Ni`
`CU , 300^(@)C, NH_(3),NaBH_(3):CN`

Solution :
Discussion
1392.

Which one of the following is simple ether?

Answer»

`CH_(3)-O-C_(2)H_(5)`
`C_(2)H_(5)- O-CH_(3)`
`C_(2)H_(5)-O-C_(2)H_(5)`
`C_(3)H_(7)-O-C_(2)H_(5)`

ANSWER :C
Discussion
1393.

Which of the following does not form Grignard reagent :

Answer»

`HC -= C - CH_2CH_2Cl`<BR>`H_2N - CH_2CH_2Cl`
`CH_3-CH-undersetoverset(|)(OH)(CH_2) CH_2 Br`

Solution :All the groups have reactive GROUP than halogens when treated with MG. Acidic functional group of the molecules does not suitable for the GRIGNARD preparation
Discussion
1394.

Which połymer is used instead of natural rubber ?

Answer»

BUTYL RUBBER
SBR
Vulcanized rubber
All of these

Solution :Butyl rubber
Discussion
1395.

What is lanthanide contraction ? Give its cause. What are the consequences of lanthanide contraction ?

Answer»

Solution :In the lanthanides, there is a regular decrease in the size of atoms and tripositive ions with increase in atomic number. This decrease of ionic and atomic RADII in the lanthanide elements is called lanthanide contraction. For example, the ionic radii decrease from `Ce^(3+) (1.11 Å)` to `Lu^(3+) (0.93 Å)`.
Cause of lanthanide contraction. As we move from LEFT to right in the lanthanides, for EVERY proton added to the nucleus, the additional electron enters 4f orbital. But 4f electrons are too diffused to effectively screen the nucleus. Due to this poor or ineffective shielding by 4f electrons, the effective nuclear charge increases and size decreases.
Consequences of lanthanide contraction. The important consequence of lanthanide contration are
(i) Chemical similarilty. Due to lanthanide contraction, the increase in radii from SECOND to third transition series vanishes. Consequently, the pairs of elements Zr -- Hf, Nb – Ta, Mo – W, etc. have almost similar sizes and therefore, the properties of these elements are similar.
(ii) There is small but STEADY increase in the standard electrode potential values
`(E^(@)) (M^(3+) + 3e^(-) hArr M)`for these elements,
(iii) The basic strength of oxides and hydroxides decrease with increase in atomic number. Thus, `La (OH)_(3)` is most basic and`Lu (OH)_(3)` is the least basic.
Discussion
1396.

Which of the following does not react with fluorine ?

Answer»

He
Kr
Ar
Ne

Answer :B
Discussion
1397.

Which of the following configuration corresponds to an alkaline earth metal ?

Answer»

`[NE]3S^(2)3P^(1)`
`[Ar]3D^(10)4s^(2)`
`[Kr]5s^(1)`
`[Ar]4s^(2)`

Answer :D
Discussion
1398.

Thermodynamic feasibility of the reaction alone cannot decide the rate of the reaction. Explain with the help of one example.

Answer»

Solution :Thermodynamically, the conversion of diamond to GRAPHITE is highly feasible because ENERGY is released in this conversion or COMBUSTION of fuels is ALSO feasible. But these reactions do not OCCUR at room temperature because their activation energy is very high.
Discussion
1399.

Which among the following reduces Tollen's reagent?

Answer»

Methanal
Propanone
Benzophenone
Acetophenone

Answer :A
Discussion
1400.

The shape of [PtCl_(4)]^(2-) is

Answer»

tetrahedral
square planar
linear
triangular bipyramidal

Answer :B
Discussion