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15851.

What are condensation polymers ? Give two examples.

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Solution :These are the polymers which are PRODUCED as a result of condensation of monomers having two FUNCTIONAL groups each and are accompained by the loss of SIMPLE molecules like `H_2O` , `NH_3` etc.
EG. Nylon -66 , terylene.
Discussion
15852.

Which of the following compounds is paramagnetic ?

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Tetracyanonickelate (II) ion
Tetraammine ZINC (II) ion
Hexaammine CHROMIUM (III) ion
Diammine SILVER (I) ion

Answer :C
Discussion
15853.

Which metal does not react with CuSO_4 solution ?

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Fe
Zn
Mg
Ag

Answer :D
Discussion
15854.

Which does not react with chlorine in dark?

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`CH_4`
`C_2H_2`
`C_2H_4`
`CH_3CHO`

ANSWER :A
Discussion
15855.

Using IUPAC norms write the formulas for the following: Potassium tetracyanonickelate(II)

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SOLUTION :`K_(2)[Ni(CN)_(4)]`
Discussion
15856.

Which one of the following is useful in paper manufacturing industry ?

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FIBROUS palnts
Orchids
Non-flowering PLANTS
Plants grwoing in HIGH ALTITUDE

ANSWER :A
Discussion
15857.

Which is a poison ?

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`Hg_2Cl_2`
`As_2O_3`
`NaHCO_3`
`NACL`

ANSWER :B
Discussion
15858.

When m- chlorobenzaldehyde is treated with 50% KOH solution , the product (s) obtained is (are)

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` (##AKS_NEO_CAO_CHE_XII_V02_P03_APP_E05_062_O02.png" width="30%">
` (##AKS_NEO_CAO_CHE_XII_V02_P03_APP_E05_062_O03.png" width="30%">

ANSWER :B
Discussion
15859.

Which of the following complex is heteroleptic ?

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`[Co(NH_(3))_(6)]Cl_(3)`
`PtCl_(4).4NH_(3)`
`PtCl_(2).4NH_(3)`
`PtCl_(4).3NH_(3)`

Solution :(b) All `Pt^(4+)` COMPLEXES have C.N.=6,`[Pt(NH_(3))_(4)Cl_(2)]Cl_(2)`
(c ) `[Pt(NH_(3))_(2)Cl_(2)].2NH_(3) " or "[Pt(NH_(3))_(4)]Cl_(2)`
(d) `[Pt(NH_(3))_(3).Cl_(3)].Cl "or " [Pt(NH_(3))_(2).Cl_(4)].NH_(3)`
Discussion
15860.

Which of the following pH curve represent the titration of weak acid and strong base (dotted line show equivalence point)?

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ANSWER :B
Discussion
15861.

Which of the following set contains species having same angle around the central atom?

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`SF_(4), CH_(4), NH_(3)`
`NF_(3),BCl_(3),NH_(3)`
`BF_(3),NF_(3),AlCl_(3)`
`BF_(3),BC l_(3),BBr_(3)`

Answer :D
Discussion
15862.

Which substance will conduct the current in the solid state ?

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DIAMOND
GRAPHITE
IODINE
SODIUM chloride

Solution :Graphite conducts electricity in the solid STATE.
Discussion
15863.

Which is a mixed anhydride?

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`NO_2`
`N_2O_3`
`N_2O_5`
`N_2O`

ANSWER :A
Discussion
15864.

When limestone is heated, carbon dioxide is given off. This operation in metallurgy is known as:

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Smelting
re-dressing
calcination
Roasting

Answer :C
Discussion
15865.

Which of the following compound/s have more electron density than

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SOLUTION :Which of the FOLLOWING COMPOUND /……..
Discussion
15866.

What is the other name of Buna-S rubber ?

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Nylon-6
DACRON
Buna-N
SBR

SOLUTION :SBR
Discussion
15867.

Writethe Haworth.s structure of alpha - D (-fructopyranose.

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SOLUTION :
Discussion
15868.

Write the rate equation for 2A+B to C if the order of the reaction is zero.

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SOLUTION :RATE `=K[A]^(0)[B]^(0)` or Rate = k.
Discussion
15869.

When acidified K_(2)Cr_(2)O_(7) solution is added to Sn^(2) salts , then Sn^(2+) changes to

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

ANSWER :C
Discussion
15870.

Write the equations for the Van Arkel method used for the refining of Zirconium, the two temperatures being = 870 K and 2070 K.

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SOLUTION :`UNDERSET(IMPURE)(ZR)+2l_2overset(870k)toZrl_4`
`Zrl_4overset(2070k)toZr+2l_2`
Discussion
15871.

Which gives a ketone with a Grignard's reagent:

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Formaldehyde
Ethyl alcohol
Methyl cyanide
Methyl iodide

Answer :C
Discussion
15872.

Under the same reaction conditions, intial concentration of 1.386 mol dm^(-1) of a substance becomes half in 40 s and 20 s through first order and zero order kinetics respectively. Ratio ((k_1)/(k_0)) of the rate constants for first order (k_1) and zero order (k_0) of the reaction is

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`0.5 MOL^(-1) dm^(-3)`
`1.5 mol dm^(-3)`
`1.5 mol dm^(-3)`
`2.0 mol^(-1) dm^(-1)`

Solution :First ORDER kinetics,
`k_1=(0.693)/(t_1//2) = 0.693/40 s^(-1)`
Zero order kinectics,
`k_1 = C_0/(2t_1//2) = 1.386/(2xx 20)`
HENCE, `k_1/k_0 = 0.693/1.386 = 0.5`
Discussion
15873.

The secondary structureof a protein refers to

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fixed configuration of the polypeptide backbone
`alpha`-helical backbone
hydrophobic interactions
sequence of `alpha`-amino acids

Solution : The secondary structure of a protein refers to the shape in which a LONG peptide chain can exist. There are two different conformations of the peptide linkage PRESENT in protein, these are `alpha`-helix and `beta`-conformation. The `alpha`-helix always bas a right handed arrangement. In `beta`-conformation all peptide chains are STRETCHED out to NEARLY maximum extension and then laid SIDE by side and held together by intermolecular hydrogen bonds. The structure resembles the pleated folds of drapery and therefore is known as `beta`-pleated sheet.
Discussion
15874.

Which of the following relation is correct for first dual reaction?

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Reaction order =molecularity
Reaction order `le` molecularity
Reaction order`gt` molecularity
Reaction order `lt` molrcularity

Solution :In the PRIMARY PROCESS,the number of specis EXPERIENCING collision,is CALLED the molecule of the process.
Discussion
15875.

Which adsorption is produced due to van dar Waal's forces ?

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PHYSICAL ADSORPTION
Chemical adsorption 
Chemisorption
None of above 

SOLUTION :Physical adsorption
Discussion
15876.

Which is not a lewis acid ?

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`CCl_4`
`SNCl_2`
`AlCl_3`
`BF_3`

ANSWER :A
Discussion
15877.

What is meant by packing efficiency ? How is it measured ?

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Solution :(i) There is some free space between the spheres of a single layer and the spheres of SUCCESSIVE layers.
(ii) The percentage of total volume OCCUPIED by these constituent spheres GIVES the packing EFFICIENCY of an arrangement. For EG., in simple cubic arrangement.
`"Packing fraction (or) efficiency" =("Total volume occupied by spheres in unit cell")/("volume of the unit cell")xx100`
Discussion
15878.

What are antagonistic drugs?

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Solution :Drugs that BIND to the receptor site and inhibit its natural function are called antagonists. These are useful when blocking of MESSAGE is REQUIRED. There are other types of drugs that MIMIC the natural messenger by switching on the receptor, these are called agonists. These are useful when there is lack of natural chemical messenger.
Discussion
15879.

Which of the following correctly matched?

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`[Fe(CN)_(6)]^(4-) and [Fe(CN)_(6)]^(3-)`-both are octahedral and diamagnetic with `d^(2)SP^(3)`. Hybridisation.
`Ni(CO)_(4) and [Ni(CN)_(4)]^(2-)`-both are tetrahedral and diamagnetic with `sp^(3)`-hybridisation
`Ni(CO)_(4) and [Co(CO)_(4)]^(-)`-both are tetrahedral and diamagnetic
`[Co(H_(2)O)_(6)]^(3+) and [Cr(H_(2)O)_(6)]^(3+)`-both are paramagnetic annd metal is `d^(2)sp^(3)`-hybridised

Answer :C
Discussion
15880.

Which of the following chemicals used to reduce water content of food material for the preservation ?

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NaCI
Sucrose
Oils
All of these

Answer :D
Discussion
15881.

Write the overall cell reaction in mercury cell.

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Solution :`Zn (Hg) + HgO(s) to ZNO(s) + Hg(L)`
Discussion
15882.

Which of the following become passive with when dropped into conc, HNO_3 ?

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Cu
Fe
Cr
Al

Solution :DUE to OXIDE LAYER
Discussion
15883.

Which of the following compounds will undergo self aldol condensation in the presence of cold dilute alkali ?

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`CH-=C-CHO`
`CH_(2)=CHCHO`
`C_(6)H_(5)CHO`
`CH_(3)CH_(2)CHO`

SOLUTION :SINCE `CH_(3)CH_(2)CHO` has `alpha`-hydrogen ATOM, THEREFORE it will undergo aldol condensation in the presence of cold dilute alkali.
Discussion
15884.

Which compound can exhibit geometrical isomerism-

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ACETONE - oxime
isobutene
acetophnone - oxime
benzophenone - oxime

Answer :C
Discussion
15885.

Which of the following reactions does not take place? BF_(3)^(-)+F^(-)rarrBF_(4)^(-)"....(I)" BF_(3)+3F^(-)rarrBF_(6)^(3-)"...(II)" AlF_(3)+3F^(-)rarrAlF_(6)^(3-)"....(III)"

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Only (I)
Only (II)
Only (III)
Only (I) and (III)

ANSWER :B
Discussion
15886.

The splitting of spectral lines in an external magnetic field is known as the

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STARK EFFECT
Photoelectric effect
Zeeman effect
Ramn effect

Answer :C
Discussion
15887.

Which one of the following has an optical isomer ? (en=ethylenediamine )

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`[ZN(en)(NH_(3))_(2)]^(2+)`
`[Co(en)_(3)]^(3+)`
`[Co(H_(2)O)_(4)(en)]^(3+)`
`[Zn(en)_(2)]^(2+)`

Answer :B
Discussion
15888.

Which of the two is more covalent: SbCl_3 and SbCl_5 ?

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SOLUTION :In `SbCl_3,Sb` is in +3 oxidation state and in `SbCl_5,Sb` is in 15 oxidation state. Out of the two halides, the one that is linked to the MELAL in the higher oxidation state is more COVALENT.
Discussion
15889.

Which of the following halogen exist in solid state?

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`F_(2)`<BR>`Cl_(2)`
`Br_(2)`
`I_(2)`

ANSWER :D
Discussion
15890.

The S.I unit of cell potential is _________.

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ohm
volt
ampere
mho

Answer :B
Discussion
15891.

Write the IUPAC name of following coordinate compounds. [CoCl(en)_2NH_3]^(2+)

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SOLUTION :Chloro his (ethylene diammine)' ammine COBALT (III)ion.
Discussion
15892.

What is the action of the following regents on ammonia : (a) Nessler's reagent (b) Sodium metal

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Solution :Ammonia with ELECTROPOSITIVE metals like Na and K forms AMIDES.
(i) `2Na+2NH_(3) rarr underset("Sodium AMIDE")(2NaNH_(2)+H_(2))`
(ii) `2K+2NH_(3)rarrunderset("Potassium amide")(2KNH_(2)+H_(2))`
Discussion
15893.

Which of the following compound is used for estimation of CO ?

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`I_(2)O_(5)`
`KI +H_(2)O`
`I_(2)`
`Cl_(2)O_(6)`

ANSWER :A
Discussion
15894.

Which radioactive carbon has been helpful in understanding the mechanism of photosynthesis in plants

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`._(6)C^(14)`
`._(6)C^(13)`
`._(6)C^(12)`
`._(6)C^(15)`

Solution :`._(6)C^(14)` is USED to determine the mechanism of PHOTOSYNTHESIS
Discussion
15895.

Which of the following is an example of absorption ?

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Water on SILICA gel 
Water on calcium chloride 
HYDROGEN on FINELY divided nickel 
Oxygen on METAL SURFACE 

Solution :Water on calcium chloride
Discussion
15896.

Write the balanced equations involved in the preparation of potassium dichromate from chromite ore.

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SOLUTION :`4 FeCr_2O_4 + 8Na_2CO_3 + 7O_2 to 8Na_2CrO_4 + 2Fe_2O_3 + 8CO_2`.
` 2Na_2 CrO_4 + 2H^(+) to Na_2Cr_2O_7 + 2NA^(+) + H_2O` OR
` 2Na_2CrO_4 + H_2SO_4 to Na_2Cr_2O_7 + Na_2SO_4 + H_2O`
`Na_2 Cr_2O_7 + 2KCL to K_2Cr_2O_7 + 2NaCl`
Discussion
15897.

Which is employed in the softening of hardwater to absorb Ca^(2+) and Mg^(2+)ions?

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Alumina
Silica GEL
PERMUTIT
Charcoal

Solution : Permutit
Discussion
15898.

When 20g of naphthoic acid (C_(11)H_(8)O_(2)) is dissolved in 50g of benzene (K_(f) = 1.72 K kg mol^(-1)). Van't Hoff factor (i) is 0.5. What is the depression in freezing point in ""^(@)K.

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ANSWER :2
Discussion
15899.

Which one of the following is not affected by the denaturation of protein?

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Primary STRUCTURE
TERTIARY structure
Secondary structure
Quaternary structure

ANSWER :A
Discussion
15900.

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

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0.75 L of 10 N HCl and 0.25 L of 4 N HCl
0.80 L of 10 N HCl and 0.20 L of 4 N HCl
0.33 L of 10 N HCl and 0.67 L of 4 N HCl
0.5 L of 10 N HCl and 0.5 L of 4 N HCl.

Solution :LET volume of 10N needed `=x`
Volume of 4N HCl needed `=1-x`
Now `10xx x +4(1-x)=6xx1`
`10x+4-4x=6`
`6x=2 " or " x=2//6=0.33L`
Volume of 10N HCl `=0.33L`
Volume of 4N HCl `=1-0.33=0.67L`
Discussion