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22551.

Which of the following test will not be given by , (Squaric acid)

Answer»

`Br_(2)` water test
`2,4`-DNP test
Neutral `FeCl_(3)`
TOLLEN's test

Solution :TERMINAL alkyne and `-CH=O` group gives `+ve` test with tollens reagent.
Discussion
22552.

Which of the following can be measured by the Ostwald-Walker dynamic method

Answer»

VAPOUR PRESSURE of the solvent
Relative lowering of vapour pressure
Lowering of vapour pressure
All of these

Solution :Ostwald-Walker dynamic METHOD is used for MEASUREMENT of relative lowering of vapour pressure.
Discussion
22553.

Which one of the following order is correct for the bond energies ?

Answer»

`I_(2)GT Cl_(2)gt Br_(2)`<BR>`Br_(2) gt Cl_(2) gt I_(2)`
`I_(2) gt Br_(2) gt Cl_(2)`
`Cl_(2)gtBr_(2) gt I_(2)`

ANSWER :D
Discussion
22554.

Which is a stronger reducing agent, SbH_3 or BiH_3, and why?

Answer»

Solution : `BiH_3` is a stronger REDUCING AGENT than `SbH_3` because of SMALLER bond dissociation enthalpy.
Discussion
22555.

Trimethyl amineon acetylation gives

Answer»

TRIMETHYL acetyl AMINE
triacetyl METHYLAMINE
diacetyl DIMETHYLAMINE
none of these

Answer :D
Discussion
22556.

Which compound is oxidised to prepare methyl ethyl ketone?

Answer»

2-butanol
1-butanol
2-propanol
1-buty ALCOHOL

ANSWER :A
Discussion
22557.

Which metal can deposit copper from copper sulphate solution:

Answer»

Mercury
Iron
Gold
Paltinum

Answer :B
Discussion
22558.

Which of the following does not respond to iodoform test

Answer»

ETHANOL
METHANOL
ACETALDEHYDE
Acetone

Answer :B
Discussion
22559.

Which is/are covalent solid:

Answer»

`Fe_2O_3`
Diamond
Graphite
All

Answer :D
Discussion
22560.

The word argon means

Answer»

Noble
Now
Strange
Lazy

Answer :D
Discussion
22561.

Which sulphate has the highest solubility in water

Answer»

`BeSO_4`
`MgSO_4`
`CaSO_4`
`BaSO_4`

ANSWER :A
Discussion
22562.

Which reaction is correct?

Answer»

`CH_(3)-overset(O)overset(||)C-O-underset(CH_(3))underset("|")"CH"-CH_(2)-CH_(3)overset(Delta)RARR CH_(3)-CH_(2)-CH=CH_(2)"(Major)"`
`CH_(3)-underset(F)underset(|)(C)H-CH_(2)-CH_(3)overset("alc. KOH")underset(Delta)rarr CH_(3)-CH=CH-CH_(3)"(Major)"`

Answer :A
Discussion
22563.

The spin only magnetic moment of Ni^(2+) in aquous solution would be

Answer»

1.73
2.84BM
4.9BM
0

Answer :B
Discussion
22564.

Whichof the following statement is correct ?

Answer»

The oxidation state of iron in sodium nitro prusside `Na_(2)[Fe(CN)_(5)(NO))[` is +3
`[Ag(NH_(3))_(2)]^(+)` is LINEAR in shape
In `[Fe(H_(2)O)_(6)]^(3+)`, Fe is `d^(2)sp^(3)` hybridized
In `Ni(CO)_(4)`, the oxidation state of Ni is 1

Answer :B
Discussion
22565.

Which of the following point defects are shown by AgBr(s) crystals ? (A) Schottky defect (B) Frenkel defect (C) Metal excess defect (D) Metal deficiency defect.

Answer»

(A) and (B)
(C) and (D)
(A) and (C)
(B) and (D)

SOLUTION :(A) and (B)
Discussion
22566.

When H_(2)S is passed through Hg_(2)^(2+), we get

Answer»

HGS
`HgS+Hg_(2)S`
HgS+HG
`Hg_(2)S`

SOLUTION :`Hg_(2)S`
Discussion
22567.

What is formalin ? Give its use.

Answer»

Solution :40% AQUEOUS solution of FORMALDEHYDE is known as formalin. It is used for the preservation of biological SAMPLES.
Discussion
22568.

Which of the following is true for diprotic acid, H_(2)X ?

Answer»

`K_(a_(2))gt K_(a_(1))`
`K_(a_(1))gt K_(a_(2))`
`K_(a_(2))=(1)/(Ka_(1))`
`K_(a_(2))=K_(a_(1))`

ANSWER :B
Discussion
22569.

What happens whenethyl chloride is treated with aqueous KOH,

Answer»

SOLUTION :`underset("Ethyl CHLORIDE")(CH_(3)-CH_(2)-Cl+KOH_((aq)))overset(S_(N)2)RARR underset("Ethyl alcohol")(CH_(3)-CH_(2)-OH)`
Discussion
22570.

Write the structure of p-methyl benzaldehyde molecule.

Answer»

SOLUTION :
Discussion
22571.

Which of the following is not a copolymer?

Answer»

Buna-S
Baketite
NEOPRENE
Dacron

Solution :Neoprene is a HOMOPOLYMER of CHLOROPRENE.
Discussion
22572.

Which of the following gives p-tert butyl phenol

Answer»


Phenol + Tert butly alcohol `OVERSET(H^(+))to `
Phenol + Isobutyl chloride `underset(Delta)overset(AlCl_(3))to`
Phenol + Tert butyl chloride `overset(AlCl_(3))to`

Solution :
(b),(c) and (d) will give same product because they will FORM `3^(@)` carbocation (c) will also give same product because `CH_(3)-underset(CH_(3))underset(|)CH-overset(o+)CH_(2)to CH_(3)-underset(CH_(3))underset(|)overset(o+)C-CH_(3)`
Discussion
22573.

While antacids and antiallergic drugs interfere with the function of histamines, why do these not interfere with the function of each other?

Answer»

SOLUTION :Drugs designed to cure some AILMENT in one organ in the body do not produce any EFFECT to the other because they work on different receptors. For example, secretion of histamine causes allergy. It also causes acidity due to release of HYDROCHLORIC acid in the stomach. Since antiallergic and antacids drugs work on different receptors, therefore, antihistamines remove allergy while antacids remove acidity.
Discussion
22574.

Assign reasons for the following: What is lanthanoid contraction ? Explain its any one consequence.

Answer»

Solution :REGULAR DECREASE of atomic and ionic radii with increase in atomic number in CASE of lanthanoids is CALLED lanthanoid contraction.
Discussion
22575.

Two moles of a liquid A(P_(A)^(@) = 100" torr") and 3 moles of liquid (B) ( P_(B)^(@)= 150 "torr")form a solution having vapour pressure os 120 torr. Based upoin this observation which of the following is correct ?

Answer»

<P>Interactions between like molecules `GT` those between unlike molecules
Interactions between like molecules `lt` those between unlike molecules
Interaction between like molecules = those betweenunlike molecules
Nothing can be concluded.

Solution :Mole fraction of `A=2/(2+3)=0.40` Mole fraction of `B=3/(2+3)=0.60`
Accordiing to RAOULT's Law
` P=P_(A)^(@)x_(A)+P_(B)^(@)X_(B)`
`P=(100"torr"xx0.4)+(150"torr"xx0.6)`
=(40+90)=130 torr
Scine the OBSERVED vapour pressure (120 torr) is samller that the calculated value of value of vapour pressure, this means that interactions `(A-B)gt(A-A)"and"(B-B)` interactions In other words, solution exhibits nagative DEVIATIONS from Raoult's Law.
Discussion
22576.

When nitrobenzene is treated with Br_(2) in presence of FeBr_(3) , the major product formed is m-bromonitrobenzene. Statements which are related to obtain m-isomer are:

Answer»

The electron DENSITY on meta carbon is more than that on ORTHO and para positions
The intermediate (CARBONIUM ION) formed after initial attack of `Br^(+)` at the meta position is least destabilized.
Loss of aromaticity when `Br^(+)` attacks at the ortho and para positions and not at meta position.
Easier loss of `H^(+)` to regain AROMATICALLY from the meta position than from ortho and para positions.

Solution :The intermediate carbonium ion formed after initial attack of `Br^(+)` at the meta position is least destabilized. Hence(B) is the correct answer
Discussion
22577.

Which of the following compound will be most reactive for SN_(1) and SN_(2) reactions

Answer»




ANSWER :A
Discussion
22578.

The reason for double helical structure of DNA is operation of :

Answer»

electrostatic attractions
van DER Waals, forces
DIPOLE -dipole INTERACTIONS
hydrogen bonding

Answer :D
Discussion
22579.

which isomer of hexane has only two different sets of structurally equivalent hydrogens atoms

Answer»

2, 2-dimethylbutane
2-methyl pentane
3-methylpentane
2, 3-dimethylbutane

SOLUTION :It has 9 primary and 2 tertiary HYDROGEN ATOMS.
Discussion
22580.

Which of the following occurs in free state ?

Answer»

N
P
As
Sb

Answer :A
Discussion
22581.

When a light of suitable frequency strikes a metal surface, then the number of ejected electrons :

Answer»

INCREASES with increase of FREQUENCY of incident PHOTON
Decreases with increase of frequency of incident photon
Does not DEPEND on the frquenc of photon but depends only on the intensity of incident light
Depends both on internsity and frequnecy of the incident photon.

Answer :C
Discussion
22582.

Which of the following statements not correct regarding sp hybridisation of carbon ?

Answer»

1.It is shown by COMPOUNDS with `C-=C` BOND
2.It leads to the formation of two hybridised and two unhybridised orbitals of carbon
3.It results in tetrahedral geometry
4.The bond angle in compounds containing sp HYBRID orbitals is `180^(@)`

ANSWER :C
Discussion
22583.

The time required for a first order reaction to complete 90% is

Answer»

0.1k
`(K)/(2.303)`
`(0.1xx2.303)/(2K)`
`(2.303)/(k)`

ANSWER :B::C::D
Discussion
22584.

Which of the following is/are paramagnetic: NO_(2), NO, N_(2)O_(4), N_(2)O_(2), N_(2)O_(5)

Answer»

Only `NO_(2)`
 `NO_(2)`, NO
 NO, `NO_(2)`, `N_(2)O_(5)`
all are paramagnetic

Answer :B
Discussion
22585.

Write two differences between ideal and non-ideal solution

Answer»

SOLUTION :
Discussion
22586.

When acidified K_2Cr_2O_7 solution is added to Sn^(2+)salts, then Sn^(2+)changes to

Answer»

SN
`Sn^(3+)`
`Sn^(4+)`
`Sn^(+)`

SOLUTION :`Sn^(4+)`
Discussion
22587.

Write the products in the following:

Answer»

SOLUTION :
Discussion
22588.

Thermostats are:

Answer»

Cross-linked polymers
Do not MELT or SOFTEN on heating
Cross -LINKING is USUALLY developed at the time of moulding where they harden reversibly
All

Answer :D
Discussion
22589.

What are biopolymers and biodegradable polymers ? Give two examples.

Answer»

Solution :Biopolymers .The polymers ASSOCIATED with living systems are called biopolymers eg. STARCH, WOOD etc.
Biodegradable polymers . The polymers which can be degraded or destroyed by enzymes are called biodegradable polymerse.g. PHBV, Nylon-2-Nylon-6 .
Discussion
22590.

Two types of voids are_____and_____

Answer»

SOLUTION :OCTAHEDRAL VOIDS and TETRAHEDRAL
Discussion
22591.

Write the products in the following:

Answer»

SOLUTION :
Discussion
22592.

What is a colligative property?

Answer»

Solution :The property of a dilute solution, which depends only on the NUMBER of SOLUTE PARTICLES present in solution (but not on the nature and composition of solute) is called colligative property
Discussion
22593.

What is the mas of sodium bromate and the solution necessary to prepare 85.5 mL of 0.672 N solution when the half cell reaction is BrO_(3)^(-) +56H^(+) + 6e^(-) rarr Br^(-) + 3H_(2)O.

Answer»


ANSWER :1.446g,0.112M
Discussion
22594.

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

Answer»

Solution :Promethium or `Pm(Z= 61) = [Xe] 4f^(5) 4d^(0) 6s^(2)`
Protactinium or `Pa (Z = 91) = [Rn] 5F^(2) 6d^(1) 7s^(1)`
Mendelevium or `MD(Z = 101) = [Rn] 5f^(13) 6d^(0) 7s^(2)`
MEITNERIUM or `Mt(Z = 109) = [Rn] 5f^(14) 6d^(7) 7s^(2)` .
Discussion
22595.

When is a solid a good adsorbent ?

Answer»

SOLUTION :When the SOLID is in FINELY DIVIDED STATE.
Discussion
22596.

Write the products in the following:

Answer»

SOLUTION :
Discussion
22597.

Write the products in the following:

Answer»

SOLUTION :
Discussion
22598.

Write the products in the following:

Answer»

SOLUTION :
Discussion
22599.

What happens to the half life period of a first order reaction if the Initial. concentration of the reactants is increased?

Answer»

Solution :Since half life period of first order REACTION is independent of INITIAL concentration of REACTANT it does not CHANGE.
Discussion
22600.

Which compound in each of the following pairs will react faster by S_(N)1 reactions in aqueous KOH. Give reasons. (a) CH_(3)CH_(2)-Br or CH_(3)CH_(2)-Cl (b) CH_(3)CH_(2)CH_(2)CH_(2)-X or (CH_(3))_(3)C-X

Answer»

Solution :(a) `S_(N)1` reactions occur by carbocation intermediates. Since, `CH_(3)CH_(2)Br` or `CH_(3)CH_(2)Cl` give the same carbocation, `CH_(3)CH_(2)^(+)`, therefore, stability of the carbocation does not affect the rate of the REACTION. Further, since, `Br^(-)` ion is a BETTER leaving group than `Cl^(-)` ion, therefore, `CH_(3)CH_(2)-Br` will react faster than `CH_(3)CH_(2)-Cl` with aq. KOH by `S_(N)1` mechanism.
(b). `S_(N)1` reactions occur by carbocation intermediates

Since, `3^(@)` carbocation in more stable than `1^(@)` carbocation, therefore, `(CH_(3))_(3)C-X` will react faster than `CH_(3)CH_(2)CH_(2)CH_(2)-X` with aq. KOH by `S_(N)1` mechanism.
Discussion