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6751.

Which among the following solids is a nonpolar solid?

Answer»

HYDROGEN chloride
SULPHUR DIOXIDE
Water
carbon dioxide

SOLUTION :Carbon dioxide is a non-polar solid.
Discussion
6752.

Write the structure of 2, 4-dinitrochlorobenzene.

Answer»

SOLUTION :
Discussion
6753.

When two A.O. combine they form B.MO & ABMO. During BMO .x. energy is released & during ABMO .y. energy is absorbed. So the correct relation will be :-

Answer»

X = y
`x LT y`
`y lt x`
NONE of these

Answer :C
Discussion
6754.

Which of following will show Tautomerism

Answer»




Solution : Only CONTAINS `SP^(3)` carbon ATTACHED indiretly to -I group
Discussion
6755.

Whichone is produced duringdigestionof starchby the enzyme alpha - amylase ?

Answer»

MALTOSE
GLUCOSE
FRUCTOSE
LACTOSE

ANSWER :A
Discussion
6756.

Whatis meantby dextroand levo rotatory ?

Answer»

Solution :(i) FISCHER has devise a projecion formulatorelatethe TWO enantiomericforms . Baseon this ,CARBOHYDRATES are namedas Dor L .
+and - SIGN indicatesthedextrorotatoryand LEVO rotatoryrespectively .
(iii) Dextrorotatorycompound rotate the planeor planepolarisedlightin clokwise directionwhilerotatorycompounds rotatein anticlockwisedirectionwhilethe levorotatorycompounds rotate inanticlokwisedirection .
(iv) Dextrorotatorycompoundsare reprsented as D(+)or L (+) and thelevo rotationcompoundas D(-)orL(+).
`underset("D-Glyceraldehyde")(H-underset(CH_2 OH)underset(|)overset(CHO)overset(|)C-OH) ""underset("L-Glyceraldehyde")(HO-underset(CH_2 OH)underset(|)overset(CHO)overset(|)C-H)`
Discussion
6757.

Which of the following is incorrect for glucose ?

Answer»

it CONTAINS four `gt CHOH` GROUPS
it contains one ketone group
it contains one `CH_2OH` group
it contins one `-CHO` group

ANSWER :B
Discussion
6758.

Two moles of n ideal gas are allowed to expand from a volume of 10dm^(3) to m^(3) at 300 K against a pressure of 101.325 kPa. Calculate the work done

Answer»

`-20.16kJ`
`13.22kJ`
`-810.6J`
`-18.96kJ`

Solution :Given, Number of moles (n)=2
Intial VOLUME `(V_(1))=10dm^(3)=0.01m^(3)`
`(because1dm^(3)=(1)/(1000)m^(3))`
Final volume `(V_(2))=2m^(3)`
`P_("ext")=101.325kPa`
Temperature (T) = 300k
`because` Work done due to CHARGE in volume against a CONSTANT pressure is given by
`W=-P_("ext")(V_(2)-V_(1))`
`:." "w=-101.325kPaxx(2-0.0.1)m^(3)`
`=-201.636kPam^(3)or-201.6kJ`
`(because1kJ=akPam^(3))`
Discussion
6759.

Which of the following will not give Hoffmann bromaminde reaction ?

Answer»

`CH_(3)-OVERSET(O)overset(||)C-NH_(2)`
`Ph-overset(O)overset(||)C-NH_(2)`
`CH_(3)-overset(O)overset(||)C-NH-Br`
`Ph-overset(O)overset(||)C-NH-Ph`

Solution :(d) `Ph-overset(O)overset(||)C-NH-Ph`
N-substituted amide will not UNDERGO Hoffmann bromamide REACTION because FORMATION of iso-cyanate is not POSSIBLE
Discussion
6760.

Which of the following solution will have pH of 4.74

Answer»

100 mL of 1 M `CH_(3)COOH (pK_(a)=4.74)` at the equivalence point using 1 M NaOH
50 Ml OF 1 M `CH_(3)COONa+25` mL of 1 M HCl
50mL of 1 M `CH_(3) COOH +` 25 mL of 1 M NaOH
Both (B) and (C )

Solution :In acid base titration, at equivalence point pH `=pK_("in")`
50 mL of 1M `CH_(3)COONa + 25 mL ` of 1M HCl
`=25` mL of 1 M `CH_(30COOH +25` mL of 1 M NaCl
This is because strong acid HCl will displace weak acid, `CH_(3)COOH`
In case of an acid solution when
[salt]=[acid]
`pH =pK_(a)=4.74`
`:. ` Choice `(B)` is CORRECT .
At mid point of a titration of a weak acid and strong base
`pH=pK_(a) =4.74`
`:. ` Choice `(C )` is also correct
Discussion
6761.

Which one has a planar structure?

Answer»

`NH_4^+`
`SC l_4`
`XeF_4`
`BF_4^-`

ANSWER :C
Discussion
6762.

Which is not correct statement about the chemistry of 3d and 4f series elements ?

Answer»

3d-elements show more oxidation statesthan 4f-series elements ?
The ENERGY difference between 3d and 4S orbitals is very little
Europium (II) is more stable than Ce(II)
The PARAMAGNETIC character in 3d -series elements increases from scandium to copper.

Solution :The paramagnetic character is 3d series elements FIRST increases from Sc to Mn as the number of unpaired electrons increases and then decreases as the number of unpaired electrons decreases from Fe to Cu.
Discussion
6763.

Which of the following pairs are correctly matched? {:(,"Reactants","Products"),("I.",RX+Ag(OH)(aq),RH),("II.",RX+AgCN(alc),RNC),("III.",RX+KCN(alc),RNC),("IV.",RX+Na("ether"),R-R):}

Answer»

I alone
I and II
II and III
II and IV

Answer :D
Discussion
6764.

Which of the following is Loschmidt number

Answer»

`6xx10^(23)`
`2.69xx10^(19)`
`3xx10^(23)`
NONE of these

Solution :The no. of molecules present in 1 ml of get at STP is known as Loschmidt number.
22400 ml of gas has TOTAL no. of molecules
`=6.023xx10^(23)`
1 ml of gas has total no. of molecules `=(6.023xx10^(23))/22400`
`=2.69xx10^(19)`.
Discussion
6765.

Which of the following compounds will yield ethane on treatment with sodium in dry ether ?

Answer»

`C_(2)H_(4)` <BR>`C_(2)H_(5)CL`
`C_(2)H_(5)OH`
`CH_(3)Br`

Solution :`CH_(3)Br + 2Na + CH_(3)Br rarr underset("ETHANE")(CH_(3)CH_(3)) + 2NaBr`
Discussion
6766.

The temporary hardness of water due to calciumbicarbonate can be removed by

Answer»

1. ADDING `CaCl_(2)`
2. adding HCI
3. FILTRATION
4. adding HCI

Answer :B
Discussion
6767.

Write the cell reaction of a lead storage battery when it is discharged. How does the density of the electrolyte change when the battery is discharged ?

Answer»

Solution :* The DISCHARGING reaction of lead storage CELL is as follows :
`Pb_((S))+PbO_(2(S))+2H_(2)SO_(4(aq)) to 2PbSO_(4(S))+2H_(2)O_((l))`
* Density of electrolyte get decreases when discharging is going on. Initially 38% `H_(2)SO_(4)` is taken as ELECTROLYTIC in BATTERY. `H_(2)SO_(4)` has more density than water.
* In this reaction `H_(2)SO_(4)` is utilized and water is formed. so the density of electrolyte decreases.
Discussion
6768.

Which of the following are reducing agents:-

Answer»

A,D
A,B,E
A,B,D,E
All (A to E)

ANSWER :C
Discussion
6769.

Which does not have S-S bond? (

Answer»

`H_(2)S_(2)O_(2)`
`H_(2)S_(2)O_(5)`
`H_(2)S_(2)O_(4)`
`S_(3)O_(9)`

Answer :D
Discussion
6770.

Which of the following graph for ln k to 1/T is correct ?

Answer»




ANSWER :A
Discussion
6771.

The standard reduction potential for the half reactions are as Zn to Zn^(2+) + 2e^(-) E^@ = +0.76 V Fe to Fe^(2+) + 2e^(-) E^@ = +0.41 V. So for cell reaction Fe^(2+) + Zn to Zn^(2+) + Fe is ……….. .

Answer»

`-0.35 V`
`+0.35 V`
`+1.17 V`
`-1.17V`

Solution :In the reaction `Fe^(2+) + ZN^@ to Zn^(2+) + Fe^(@)`
`emf = E_("cathode") -E_("ANODE")`
`= -0.41 - (0.76)`
`= -0.41 + 0.76`
emf = `+ 0.35 V`.
Discussion
6772.

The unit of cell constant is

Answer»

`OHM^(-1)`
ohm - CM
`cm^(-1)`
`ohm^(-1)cm^(2)eq^(-)`

Solution :CELL CONSTANT `= l/a = (cm)/cm^(2) = cm^(-1)`
Discussion
6773.

Which of these can be distinguished by adding HCl or Na_(2)CO_(3) ?

Answer»

`R-NH_(2)` R - CL

`CH_(3)CH_(2)OH` and `CH_(3)underset(OH)underset(|)CHCH_(3)`
`CH_(3)-underset(O)underset(||)C-CH_(3)` amd `CH_(3)CH_(2)CHO`

Solution :`R-NH_(2)` REACT with HCL but not with `Na_(2)CO_(3)`
`Na_(2)CO_(3)` react with BENZOIC acid but not with phenol
Discussion
6774.

What is the action of benzene diazonium chloride on (a) phenol in alkaline medium (b) aniline?

Answer»

Solution :Diazonium salts react with certain aromatic COMPOUNDS
having an electron-rich group `(e.g.-OH,-NH_(2), etc.)` to FORM azo
compounds. This reaction is an electrophilic substitution and are called
coupling reaction. Azo compounds are brightly coloured and are used
as dyes and indicators. Coupling reaction is an electrophilic
substitution reaction, Benzene diazonium CHLORIDE reacts with alkaline
solution of phenol to give p-hydroxy azo benzene (orange dye).
Benzene diazonium chloride reacts with aniline in MILD alkaline
medium to give p-aminobenzene (yellow dye).
Discussion
6775.

Two beaker A and B present in a closed vessel. Beaker A contains 152.4 g aqueous solution of urea, containing 12 g of urea. Beaker B contains 196.2 g glucose solution, containing 18 g of glucose. Both solutions allowed to attain the equilibrium. Determine wt. % of glucose in its'ssoltuion at equilibrium:

Answer»

6.71
14.49
16.94
20

Answer :B
Discussion
6776.

Which of the following acids is stronger than benzoic acid (K_(a)=6.3xx10^(-5)) ?

Answer»

`A(K_(a)=1.62xx10^(-7))`
`B(pK_(a)=6)`
`C(pK_(a)=4)`
`D(Ka)1.0xx10^(-5)`

Answer :C
Discussion
6777.

What is the formula of salt prepared by the reaction between NaOH and hypophosphorous acid ?

Answer»

`NaH_(2)PO_(2)`
`Na_(2)HPO_(2)`
`Na_(3)PO_(2)`
`Na_(3)PO_(3)`

SOLUTION :`2H_(3)PO_(2)+ 4NaOH to 2Na_(2)HPO_(2) + 4H_(2)O`
Discussion
6778.

Whichof the followingundergoes couplingreaction withbenzenediaxoniumchloride ?

Answer»




ANSWER :A
Discussion
6779.

Tripalmitin is

Answer»

A protein
An enzyme
A lipid
A carbohydrate

Answer :C
Discussion
6780.

Write the electrophile and intermediate in Reimer-Tiemann reaction.

Answer»

SOLUTION :`C-overset(ddot)(CL)-Cl` (DICHLOROCARBENE) is the ELECTROPHILE.
The INTERMEDIATE is phenoxy dichloromethane.
Discussion
6781.

Which one of the following has the highest relative rate ?

Answer»

`RX+KOHrarrROH+KX`
`2RX+2NararrR-R+2NaX`
`RX+MgrarrRMgX`
`RX+MgrarrRMgX`

Solution :`R-X+ KOH rarr R -OH + KH`
` X^-` . replaced OH. SHOW NUCLEOPHILIC substitution reaction
Discussion
6782.

Which of the following method is used to kill microbes in presevation ?

Answer»

REMOVAL of heat
Addition of heat
Removal of water
All of these

Answer :B
Discussion
6783.

What is formed when benzoyl chloride reacts with aniline in presence of sodium hydroxide

Answer»

Acetanilide
BENZANILIDE
Benzoic acid
Azobenzene

Solution :It is known as Schotten Baumann reaction.
`underset("ANILINE")(C_(6)H_(5)NH_(2))+ underset("Benzoylchloride")(ClCOC_(6)H_(5)) overset(NaOH)to underset("Benzanilide")(C_(6)H_(5)NHCOC_(6)H_(5))+HCl`
Discussion
6784.

Which one of the following statements, regarding hydrogen peroxide is false?

Answer»

It is more stable in a basic solution.
It is decomposed by `MnO_(2)`
It is a strong oxidizing as well as reducing agent in ACIDIC as well as basic medium.
It behaves as a reducing agent towards acidified `KMnO_(4)`

Solution :`H_(2)O_(2)` is LESS stable in a basic medium and decomposes to give `O_(2)`.
`2H_(2)O_(2)+2NaOH rarr Na_(2)O+3H_(2)O+O_(2)`
Discussion
6785.

Which of the following is not a property of silicones ?

Answer»

They are combustible
They are water-repellant
They are POLYMERIC LIQUIDS or solids
Their viscosity does not change significaltly with RISE in tamperature.

Solution :It is a fact.
Discussion
6786.

Which is maximum reactive towords acid catalysed dehydration :

Answer»




ANSWER :A
Discussion
6787.

Which of the following metal oxides is antiferromagnetic in nature?

Answer»

`MO_(2)`
`TiO_(2)`
`NO_(2)`
`CrO_(2)`

SOLUTION :`MnO_(2)` is antiferromagnetic in NATURE.
Discussion
6788.

Which of the following compounds will react with sodium hydroxide?

Answer»

`CH_3OH`
`CH_3CH_2OH`
`C_6H_5OH`
`C_6H_5CH_2OH`

ANSWER :C
Discussion
6789.

The reagent with which both acetadehyde and acetone react easily is:

Answer»

a.TOLLENS regent
b.Schiffs reagent
c.Grignard reagent
d.FEHLING's solution

Solution :Acetaldehyde REACTS with Tollens, SCHIFF's, and Fehling's solution but acetone does not. But with Grignard reagent both react.
Discussion
6790.

Which of the following is not a Hoomocyclic compound?

Answer»





Solution : it is not homocylic SINCE HETERO ATOM is present within the RING.
Discussion
6791.

Which is not an iron ore?

Answer»

Haematite
Limonite
Casseterite
Magnetite

Answer :C
Discussion
6792.

What happens when (Write reactions only) : (i) Nitroethane is treated with LiAlH_(4) ? (ii) Diazonium chloride reacts with phenol in basic medium ?

Answer»

Solution :(i) `UNDERSET("Nitroethane")(C_(2)H_(5)NO_(2))overset(LiAlH_(4))(rarr)C_(2)H_(5)-NH_(2)+2H_(2)O`
(II)
Discussion
6793.

What is the colour of ICl_3 ?

Answer»

Colourless
Shining red
Yellowish GREEN LIQUID
Orange

Answer :D
Discussion
6794.

Which of the following is not a characteristic of chemisorption

Answer»

It is IRREVERSIBLE
It is specific
It is MULTI LAYER phenomenon
Heat of ADSOPTION is about 40-400 KJ

Answer :C
Discussion
6795.

Which is the monomer unit of natural rubber?

Answer»

SOLUTION :ISOPRENE
Discussion
6796.

Which of the following pair is of non ideal solution ?

Answer»

`HCl + H_(2)O`
`HNO_(3)+H_(2)O`
`C_(6)H_(5)OH+C_(6)H_(5)NH_(2)`
All of these

ANSWER :D
Discussion
6797.

Using the data in Table 3.1, predict whether Cl_(2) disproportionates in alkaline solution: Strategy: Chlorine can exist in manu oxidation states. Chlorine in the 0 oxidation state, as in Cl_(2), can be reduced. Chorine can also be oxidized to one of several positive oxidation states. so Cl_(2) can react with itself in a redox reaction, which means that it is possible for chlorine to disproportionate. Search out two different half reactions involving Cl_(2)

Answer»

Solution :Solution: For the half reaction
`overset(0)Cl_(2)(g,1"bar")+2e^(-)hArr overset(-1)(2Cl^(-))(aq.)`
Table 3.1 lists `E^(@) = + 1.36`. This large positive reduction potentail shows that `Cl_(2)` can be easily reduced, i.e., it is a realtively powerful oxidizing agent.
The table lists the alf-reaction
`overset(+1)(2ClO^(-))(aq.1M)+2H_(2)O(1)+2e^(-)hArroverset(0)Cl_(2)("g,1 bar")+4OH^(-)(aq. 1M)`
with `E^(@)` of `0.04V`. The reverse of this half-reactions is an oxidation of `Cl_(2)`.When the two half-reaction are combined, the overall reaction is `2Cl_(2)(g,1"bar")+4OH^(-)(aq.,1M)hArrCl^(-)(aq., 1M)+CLO^(-)(aq., 1M)+H_(2)O(1)`
or, more simply
`Cl_(2)(g)+2OH^(-)(aq.,1M)hArr Cl^(-)(aq.,1M)+ClO^(-)(aq.,1M)+H_(2)O(1)`
The standard POTENTIAL of this reaction ispositive : `1.36 V - 0.40 V = 0.96 V`. Therefore, the reaction proceeds spontaneously from left to right. In other words, `Cl_(2)` in unstable in ALKALINE solution, it is converted to chloride anion and hypochlorite anion.
Discussion
6798.

What happens when potassium dichromate is heated with conc. H_(2)SO_(4) and a solution of NaCl ? Give equations.

Answer»

SOLUTION :Orange red vapours of chromyl CHLORIDE are evolved,
`K_(2)Cr_(2)O_(7)+ 4NaCl+ 6H_(2)SO_(4) overset("HEAT")to UNDERSET("Chromyl chloride")(2KHSO_(4)+ 2NaHSO_(4)+ 2CrO_(2)Cl_(2)+ 3H_(2)O)`
Discussion
6799.

Which of the following is the increasing order of enthalpy of vaporization ?

Answer»

`NH_(3), PH_(3), AsH_(3)`
`AsH_(3), PH_(3), NH_(3)`
`NH_(3), AsH_(3), PH_(3)`
`PH_(3), AsH_(3), NH_(3)`

SOLUTION :`PH_(3) LT AsH_(3) lt NH_(3)` (enthalpy of VAPORIZATION)
Discussion
6800.

Which of the following alloys is used for making clock pendulums ?

Answer»

INVAR
CONSTANTAN
BRASS
BELL metal.

Answer :A
Discussion