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3251.

Which among the followings undergoes aldol condensation ? Methanal,Benzaldehyde,Propanal ornone of the above

Answer»

Methanal
Benzaldehyde
Propanal
None of the above

Answer :C
Discussion
3252.

The standard free enrgy change for the reaction, H_(2)(g) +2AgCl(s) rarr 2Ag(s) +2H^(+) (aq.) +2Cl^(-) (aq.) is -10.26" kcal mol"^(-1) at 25^(@)C. A cell using the above reaction is operated at 25^(@)C under P_(H_(2))=1 atm, [H^(+)] and [Cl^(-)]=0.1. Calculate the emf of the cell.

Answer»


ANSWER :0.340 VOLT
Discussion
3253.

Write the equations involved in the following reactions: (i) Wolff-Kishner reduction (ii) Etard reaction.

Answer»

SOLUTION :
Discussion
3254.

Which of the following is NOT an ore ?

Answer»

Bauxite
Malachite
Zinc blende
Pig iron

Answer :D
Discussion
3255.

Which of the following changes will increase the emf of the cell : Co(s) | CoCl_2 (M_1)|| HCl(M_2) |Pt(H_2,g)

Answer»

increase the volume of `CoCl_2` solution from 100 mL to 200 ml
increase `M_2` from 0.01 M to 0.50 M
increase the pressure of the `H_2(g)` from 1.00 to 2.00 atm
increase `M_1` from 0.01 M to ` 0.50 M`

Solution :`=CO +2H^(+) + 2Cl^(-) to H_2 + Co^(+2) + 2Cl^(Ɵ) , E = E^(0) + (0.0591)/(2) log ""([H^(+)])/(P_(H_2) xx [Co^(+2)])`
`[{:([Co^(+2) ] = n//V),(v uarr [Co^(+2)] darr):}]= (4 xx 0.059)/(2) , = 0.118 = 0.12`
Discussion
3256.

What is the specific volumeof costor or its density is 956 kgm^(-3)?

Answer»

`1.05xx10^(-3)kgm^(-3)`
`1.05xx10^(-3)m^(3)kg^(-3)`
`1.25xx10^(-3)kg^(-1)`
`9.56xx10^(-3)kgm^(-3)`

ANSWER :B
Discussion
3257.

Which of the following statements is not true for halogens ?

Answer»

All form monobasic oxyacids
Chlorine has the highest electron gain enthalpy
All are OXIDIZING agents
All but fluorine show POSITIVE OXIDATION STATES

ANSWER :D
Discussion
3258.

The starting material in birkeland and Eyde process for the manufacture of HNO_3 is:

Answer»

`NH_3`
`NO_2`
Air
Chile Saltre

Answer :C
Discussion
3259.

Through which of the following reactions number of carbon atoms can be increased in the chain?

Answer»

GRIGNARD reaction
Cannizzaro's reaction
Aldol condensation
HVZ reaction

Solution :Grignard reaction and aldol condensation INCREASE the NUMBER of carbon ATOMS.
Discussion
3260.

Which of the following set is having correct statements here regarding both B and Al? 1. They react with HCl to form chlorides 3. They burn in oxygen to give oxides at high temperature 4. Their halides are Lewis acids

Answer»

1, 4
3, 4
2, 3, 4
1, 2, 3, 4

Answer :C
Discussion
3261.

The sucrose that we eat in daily life is converted into glucose and fructose. Name . theenzyme which facilitates this chemical reaction.

Answer»

Solution :Invertase or SUCROSE :
`UNDERSET("Sucrose")(C_(12)H_(22))O_(11)+H_(2)Ooverset("Invertase")underset("or SUCORSE")rarrunderset("GLOCOSE")(C_(6))H_(12)O_(6)+underset("Fructose")(C_(6)H_(12)O_(6))`
Discussion
3262.

Which of the following pairs are correctly matched?

Answer»

I alone
I and II
II and III
II and IV

Solution :`R- X + AgCN_("ALC") rarr RNC + AGX`
`2- X + 2Na rarr R - R + 2NaX`
Discussion
3263.

Which of the following statements is/are incorrect regarding order of a reaction?

Answer»

Order of a reaction may be zero, integer or fractional.
For an elementary PROCESS order of the reaction is NEVER fractional.
The order of an elementary step is not equal to its molecularity.
For the chemical equation `N_2+3H_2rarr2NH_3` the order of reaction is 4

Solution : RATE law expression or no other experimental information has been given, order can.t be predicted. Actually order of reaction is conditional with PRESSURE as 0 or 1.
In fact, the order of an elementary step is ALWAYS equal to its molecularity
Discussion
3264.

The volume of 4 N HCl and 10 N HCl required to make 1 litre of 6 N HCl are

Answer»

0.75 litre of 4 N HCL and 0.25 litre of 10 N HCl
0.25 litre of 4 N HCl and 0.75 litre of 10 N HCl
0.67 litre of 4 N HCl and 0.33 litre of 10 N HCl
0.80 litre of 4 N HCl and 0.20 litre of 10 N HCl

Solution :Suppose x L of 4 N HCl are taken. Then 10 N HCl taken `=(1-x)L`. Applying
`N_(1)V_(1)+N_(2)V_(2)=N_(3)V_(3)`
`4 xx x+10(1-x)=6xx1`
`"or"6x=4"or"x=(4)/(6)=0.67L`
Discussion
3265.

Write the IUPAC names of the following compoundsK_3[Fe(CN)_6]

Answer»

SOLUTION :Potassiumhexacyanoferrate(III)
Discussion
3266.

The shell of an egg is removed by placing it in a solution of hydrochloric acid. The egg is thenplaced in a saturated solution of sugar when the egg shrinks considerably. Tell the phenomenonassociated with it.

Answer»

SOLUTION :OSMOSIS.
Discussion
3267.

Which of the following will show positive azodye test ?

Answer»

`C_(6)H_(5)NH_(2)`
`C_(2)H_(5)NH_(2)`
`C_(6)H_(5)CH_(2)NH_(2)`
`C_(6)H_(4)(CH_(3))NH_(2)`

Solution :Only aromatic AMINES give +ve azodye test
Discussion
3268.

The relation between x and y

Answer»

`X GT y`
`x LT y`
`x =y`
`y=2x`

ANSWER :1
Discussion
3269.

Which of the following will give positive iodoform test ?

Answer»

`Ph-overset(O)overset(||)C-Me`
`Me-UNDERSET(OH)underset(|)overset(Me)overset(|)C-PH`
`Me-underset(OH)underset(|)CH-COOH`
`meCH_(2)OH`

Solution :N//A
Discussion
3270.

Which one of the following complexes will have six isomers ?

Answer»

`[CO(en)NH_(3)Cl_(2)]CL`
`[Cr(PPh_(3))_(2)(H_(2)O)_(2)Cl_(2)]Cl `
`[Co(o x)_(3)]^(3-)`
`[Co(en)_(2)Br]Cl`

Answer :D
Discussion
3271.

Which of the following properties of a system undergoing change at a constant temperature and pressure is a measure of the maximum useful work that the system can do ?

Answer»

`Delta G`
`Delta S`
`Delta H`
P `Delta V`

ANSWER :A
Discussion
3272.

Which one of the following is an example of homogeneous catalysis ?

Answer»

OXIDATION of `SO_(2)` to `SO_(3)` in the LEAD chamber PROCESS
Oxidation of `SO_(2)` to `SO_(3)` in the contact process
Manufacture of `NH_(3)` by Haber 's process
Oxidation on `NH_(3)` to NO in Ostwald ' s process

Solution :In lead chamber process reactants
`(SO)_(2)O_(2)(g)` and catalyst NO (g)
Discussion
3273.

Write the names of monomers of the following polymers : (i) [--overset(H)overset(|)N-(CH_(2))_(6)-overset(H)overset(|)N-overset(O)overset(||)C-(CH_(2))_(h)-overset(O)overset(||)C--]_(n) (ii) [--overset(O)overset(||)C-(CH_(2))_(3)-overset(H)overset(|)N--]_(n) (iii) [--CF_(2)-CF_(2)--]_(n)

Answer»

Solution :(i) Above POLYMER is Nylon-6,6. Hexamethylene diamine and ADIPIC acid monomers are USED for the preparation of these polymer.
(ii) Above polymer is Nylon-6. Caprolactum polymer is used for making of these.
(iii) Above polymer is POLYTETRAFLUOROETHENE (TEFLON). Tetrafluoroethene monomer is used for making of these polymer.
Discussion
3274.

Tyndall effect is not observed in

Answer»

suspension
starch sol
gold sol
NaCl solution

Answer :D
Discussion
3275.

triangleH for thermal decomposition process is:

Answer»

Positive
Negative
Zero
Positive or negative

Answer :A
Discussion
3276.

What is the catalyst used for oxidation of SO_(2) to SO_(3) in lead chamber process for manufacture of sulphuric acid?

Answer»

Nitric acid
Nitrous oxide
POTASSIUM iodide
DILUTE HCl

SOLUTION :Nitric oxide.
Discussion
3277.

Which of the following elements have their lower oxidation state as more stable oxidation state.

Answer»

`O`
`Pb`
`Tl`
`BI`

ANSWER :A::B::C::D
Discussion
3278.

Which is a transuranic element

Answer»

FRANCIUM
Fermium
Rhodium
Promethium

Answer :B
Discussion
3279.

Which of the following, upon treatment with tert-BuONa followed by addition of bromine water, fails to decolourize the colour ofbromine?

Answer»




Solution :
PRODUCTS formed in option (2), (3) & (4) decolories bromine solution due to PRESENCE of double BOND
Discussion
3280.

Which of the following process form Nascent H:

Answer»

`Al+NaOH`
`Zn+H_(2)SO_(4)`
`Na+C_(2)H_(5)OH`
All of these

Answer :D
Discussion
3281.

Which of the following acids remainsunaffected on heating

Answer»

Malonic acid
Malic acid
Fumaric acid
Succinic acid

SOLUTION :In fumric acid both COOH groups are present on opposite side so it UNAFFECTED on HEATING.
Discussion
3282.

Which is manufactured by electrolysis of fused NaCl ?

Answer»

NaOH
NaClO
`NaClO_3`
Na

Answer :D
Discussion
3283.

Which of the following pairs is proper for the method used in Column - I and metal obtained in Column-II ?  {:("Column -I", "Column-II"),("(P) Distillation","(X) Cu"),("(Q) Smelting", "(Y) Hg"),("(R )Electrolysis", "(Z) Sn"):}

Answer»

<P> `P to X, Q toY, R to Z `
`P to Y, Q to Z,R to X`
`P to Y, Q TOX, R to Z`
`P to Z, Q to X, R to Y `

ANSWER :B
Discussion
3284.

Which of the following is the most suitable drying agent for ammonia gas

Answer»

Calcium oxide
Anhydrous calcium chloride
PHOSPHORUS PENTOXIDE
CONC. Sulphuric acid

ANSWER :C
Discussion
3285.

Which of the following does not affect the K_(b) of an organic base ?

Answer»

`+I` or `-I` effect
Solvation effect
Density
STERIC hinderance

Answer :C
Discussion
3286.

Which of the following halogens shows maximum affinity for hydrogen?

Answer»

FLUORINE
Chlorine
Bromine
Iodine.

Answer :A
Discussion
3287.

Write the IUPAC name of

Answer»

Solution :1 - chloro toulene, or 1 - chloro, 2 - methyl BENZENE.
Discussion
3288.

This section contains Three questions. The section contains two tables (each having 3 columns and 4 rows). Based on each table, there are THREE questions. Each question has FOUR options (A). (B). [C], and [DJ. ONLY ONE of these four options is correctQFor the complex given in Column-l, the only CORRECT combination in Column 2 and 3 is:

Answer»

(II) (III).(R)
(I) (IV) (P)
(I) (iv) (R)
D (III) (i) (P)

SOLUTION :
Discussion
3289.

This section contains Three questions. The section contains two tables (each having 3 columns and 4 rows). Based on each table, there are THREE questions. Each question has FOUR options (A). (B). [C], and [DJ. ONLY ONE of these four options is correctQSelect the only INCORRECT combination among the following is:

Answer»

(II) (III)(S)
(III) (i) (Q)
 (III) (i) (P)
 (IV)(ii) (D) (P)

SOLUTION :
Discussion
3290.

What is anisotropy ? Explain.

Answer»

SOLUTION :When a substance possess the different magnitude of properties such as electrical conductivity, refractive index, THERMAL expansion etc. along different directions, it is said to be anisotropic and property is known as anisotropy.

The figure SHOWS a simple two dimensional pattern of arrangement of two kinds of atoms. Mechanical property such as resistance to SHEARING stress might be quite different in two directions AB and CD. Deformation in CD direction displaces row which has two different types of atoms while in AB direction rows made of one type of atoms are DISPLACED.
Discussion
3291.

This section contains Three questions. The section contains two tables (each having 3 columns and 4 rows). Based on each table, there are THREE questions. Each question has FOUR options (A). (B). [C], and [DJ. ONLY ONE of these four options is correctQThe CORRECT combination among the following is

Answer»

<P>(IV) (ii) (P)
(I) (iii)(P)
(II) (iii)(R)
 (III) (i) (R)

SOLUTION :
Discussion
3292.

What is meant by 'disproportionation' of an oxidation state? Give an example

Answer»

Solution :When a PARTICULAR oxidation state becomes less stable RELATIVE to other oxidation states, one lower,one higher, it is SAID to undergo disproportionation. For EXAMPLE, Mn(VI) becomes unstable relative to Mn(VII) and Mn(IV) in acidic solution
`3Mn^(VI) O_(4)^(2-) + 4H^(+) rarr 2MN^(VII) O_(4)^(-) + Mn^(IV)O_(2) + 2H_(2)O`
Discussion
3293.

Which of the following complex does not show optical isomerism

Answer»

`[CO(NH_3)_3Cl_3]`
`[Co(EN)_2Cl_2] CL`
`[Co(en)_3] Cl_3`
`[Co (en) (NH_3)_2Cl_2] Cl`

ANSWER :A
Discussion
3294.

Which if correct statement(s)/

Answer»

`[AG(NH_(3))_(2)]^(+)` is linear with sp hybridisation `Ag^(+)` ions
`NiCl_(4)^(2-),CrO_(4)^(2-)` annd `MnO_(4)^(-)` have tetrahedral geometry
`[Cu(NH_(3))_(4)]^(2+),[[Pt(NH_(3))_(4)]^(2+) and [Ni(CN)_(4)]^(2-)` have `dsp^(2)` hybridisation of the metal ion
`FE(CO)_(5)` has trigonal bipyramidal structure with `d_(z^(2))sp^(3)` hybridised ion

Answer :A::B::C::D
Discussion
3295.

Which of the following oxoacids of phosphorus is a reducing agent and a monobasic acid as well ?

Answer»

<P>`H_(4)P_(2)O_(5)`
`HPO_(3)`
`H_(3)PO_(3)`
`H_(3)PO_(2)`

Answer :D
Discussion
3296.

Which is the most effective ion in an SN^(2) displacement on methyl bromide?

Answer»

`C_(6) H_(5)O^(theta)`
OVERSET(theta)(O)H`
`C_(6)H_(5)O^(theta)`
`CH_(3)COO^(theta)`

SOLUTION :More the nucelophilc CHARACTER more the `SN^(2)` reaction. Basically and nucleophilicity are same when the nucelphilic centres are same.
Acidic order:
`HNO_(3) gt CH_(3) C COOH gt C_(6) H_(5) OH gt H_(2)O gt C_(2) H_(5)OH`
Basic and nucleophiliic order:
`NO_(3)^(o-) lt CHCOO^(o-) lt C_(6) H_(5)OO^(o-) lt O^(o-)H lt C_(2)H_(5) overset(o-)(O)`
Discussion
3297.

When water is added to sodium peroxide we get

Answer»

`O_(2) and NAOH`
`O_(2) and N_(2)CO_(3)`
`O_(2) and NA "METAL"`
`O_3 and NaOH`

Answer :A
Discussion
3298.

Two beakers of capacity 500 mL were taken. One of these beakersm labelled as ''A'', was filled with 400 mL water whereas the beaker labelled ''B'' was filled with 400 mL of 2 M solution of NaCl. At the same temperature both the bekers were place in closed containers of same material and same capacity as shown in Fig. At a given temperature, which of the following statement is correct about the vapour pressure of pure water and that of NaCl solution.

Answer»

Vapour pressure in container (A) is more than that in container (B).
Vapour pressure in container (A) is less than that in container (B).
Vapour pressure is equal in both the containers.
Vapour pressure in container (B) is twice the vapoure in container (A).

Solution :Explanation : The vapour pressure is built up due to ESCAPING tendencies of water molecules from the surface of the liquid. More the number of molecules on the surface of liquid greater would be the vapour pressure.
Since beaker A contains only water molecules at its surface it shows higher vapour pressure. But in beaker B containing NaCl solution, a fraction of surface AREA of the solution is occupied by NaCl molecules which are non - volatile in nature and have no escaping tendency.
This results into a decrease in the number of water molecules present in NaCl solution, THEREBY reducing its vapour pressure.
Discussion
3299.

One mole of a gas expands by 3L against a constant pressure of 3 atmosphere. Calculate the work done in : (a) L. atmosphere (b) Joules (c) Calories

Answer»


Solution :Given :Number ofthemoles ofa GAS= n= 1 mol
volume ofexpansion = `Delta V = 3 L`
Constantpressure`=P _(EX)=3 atm`
Work(w) = ?in L atm, Joulesand Calories
`(a) W =- P_(ex) xxDelta V`
`=- 3XX 3`
=- 9.0 L atm
(b) :' 1 L atm= 101 .3 J
`:' W=- 90xx 101 .3 J`
=- 911.7 J
(c ):' 4.184 J = 1 cal
`:' W = (-911.7)/(4.184)`
=-217. 9cal
Discussion
3300.

The solvent used in the preparation of Grignard reagent is

Answer»

DRY ether
dry acetone
dry alcohol
dry chloroform

Answer :A
Discussion