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13101.

When lead accumulator is charged it is :

Answer»

An ELECTROLYTIC cell
A galvanic cell
A DANIELL cell
None of the above

Answer :A
Discussion
13102.

When 3.06 g of solid NH_4 HS is introduced into a two litre evacuated flask at 27^@C , 30% of the solid decomposes into gaseous ammonia and hydrogen sulphide. (i) Calculate K_c and K_p for the reaction at 27^@C. (ii) what would happen to the equilibrium when more solid NH_4HS is introduced into the flask ?

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ANSWER :(i) 0.049 `atm^2`, (II) No EFFECT
Discussion
13103.

Which of the following is linear polymer ?

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Starch
BAKELITE
PVC
POLYPROPENE

ANSWER :C
Discussion
13104.

Which one is used as antifertility drug ?

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Mestranol
Norethindrone
(A) and (B) both 
LYSOL 

SOLUTION :(A) and (B) both
Discussion
13105.

Which of the following has maximum boiling point?

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Solution :Branching decreases BOILING point. HENCE, HEXANE `(C_6H_14)` has the MAXIMUM boiling point.
Discussion
13106.

Which of the following statement is CORRECT for PCl_(5) molecule /

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THREE EQUITORIAL bonds are equivalent but TWO AXIAL are larger.
All five bonds are equivalent.
Three equitorial bonds are equivalent but two axial bonds are shorter.
All five bonds have different bond lengths.

Answer :A
Discussion
13107.

What are medicines?

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Solution :Medicines are the chemical compounds USED to treat diseases, are safe to use, CAUSE no ADDICTION and have minimum TOXICITY.
Discussion
13108.

Which of the following disease(s) is/are caused by the deficiency of the enzyme phenyl ketone urea?

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Congential disease
Albinism disease
Both (a) and (b)
NONE of these

Solution :Congenital disease is CAUSED by the deficiency of the enzyme PHENYL ketone UREA.
Discussion
13109.

The vapour pressure of ether (mol. mass = 74) is 60 kPa at 293 K. If 3g of a compound A is dissolved in 50 g of ether at this tempenture, the vapour pressure falls to 56.8 kPa. Calculate molecular mass of A.

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<P>

Solution :`P^(0) = 60` kPa
P = 56.8 kPa
`W_(2) = 3g `
`W_(1) = ` 50 g
`M_(2) ` = 9
`M_(1)= 74 `
`M_(2)= (W_(2))/(W_(1)) xx M_(1) xx (P^(0))/(P^(0) - P) `
= `(3)/(50) xx 74 xx (60)/(60 - 56.8)`
`M_(2) = 83.25`
`therefore` MOLECULAR MASS of A = 83.25.
Discussion
13110.

Which of the following is pi-acid ligand?

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`NH_(3)`
`CO`
`F^(-)`
ETHYLENE diamine.

Answer :B
Discussion
13111.

Which of the following will not undergo Hoffman's bromamide reaction?

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Ethanamide
Propanamide
Methanamide
Phenyl methanamide

Answer :A
Discussion
13112.

Which of the following phenomenon is applicable to the process shown in the Fig. ?

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ABSORPTION
ADSORPTION
Coagulation
Emulsification

Solution :Adsorption
Discussion
13113.

The tripeptide hormone present in most living cells is

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GLUTATHIONE
glutamine
oxytocin
ptyalin

Solution :Glutathione.
Discussion
13114.

Which of the following is likely to have highest boiling point

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All POSSES same m.p. as they are ISOMERS

ANSWER :A
Discussion
13115.

What happens to the structure of NaCl when pressure is applied on it ?

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Solution :NACL has f.c.c. type STRUCTURE. On APPLYING PRESSURE it changes to b.c.c. type structure which is the structure of CsCl.
Discussion
13116.

Which of the following statement is correct with respect to the metal carbonyl of Ist transition series ?

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As `M-Cpi` bonding increases, the C-O bond length increases .
As positive charge on the central metal atom increases, the C-O bond length increases.
As ELECTRON DENSITY on the central metal atom increases, the C-O bond length increases.
(a) and (c ) both

SOLUTION :As M-C bond BECOMES stronger, C-O B.L.`uarr`. M-C bond becomes stronger when BACK bonding from metal to C occurs, which is possible when electron density on metal is high
Discussion
13117.

When KCl dissolves in water (assume endothermic dissolution), then:

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`DeltaH=+ve,DeltaS=+ve,DeltaG=+ve`
`DeltaH=+ve,DeltaS=-ve,DeltaG=-ve`
`DeltaH=+ve,DeltaS=+ve,DeltaG=-ve`
`DeltaH=-ve,DeltaS=-ve,DeltaG=+ve`

ANSWER :C
Discussion
13118.

What is the meaning of a positive sign for (a) a cell potential, and (b) a half-cell potential?

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SOLUTION :(a) The reaction can PROCEED as written. (B) Nothing
Discussion
13119.

Which of the following equlibrium will shift to right side on increasing the temperature

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`CO_((g))+H_(2)O_((g))hArrCO_(2(g))+H_(2(g))`
`2SO_(2(g))+O_(2(g))hArr2SO_(3(g))`
`H_(2)O_((g))hArrH_(2(g))+1/2(O_(2))_((g))`
`4HCl_((g))+O_(2(g))hArr2H_(2)O_((g))+2Cl_(2(g))`

Solution :`H_(2)O(g)hArrH_(2(g))+1/2O_(2(g))`
In this reaction volume is INCREASING in the forward reaction. So on increasing temperatue reaction will PROCEED in forward direction.
Discussion
13120.

Which statement is correct about the end product of the following reaction series.

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it is OPTICALLY INACTIVE hydroxyketone
it is a RESOLVABLE hydroxyacid
It is a nonresolvable aldehyde
It is an optically inactive hydroxyacid

Solution :
Discussion
13121.

Which of the following inhibit the growth of microorgansim?

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Tetracyacline
Pecnicillin
Olfaxacin
Aminoglycosides

ANSWER :A
Discussion
13122.

Whichof thefollowinghaslowestoctanenumber ?

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N-Hexadecane
Iso- OCTANE
n- HEXANE
n- HEPTANE

ANSWER :A
Discussion
13123.

Which of the following hydrocarbons give same product on hydrocarbonation :

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`2`-Methyl hex-`1`-ene & `3`-Methyl hex -`3`-ene
`3`-Ethyl hex-`1`en-`4`-YNE & `2`-Methylhpet-`2`-en-`4`-yne
`3`-Ethylcycloprop-`1`-ene & `1,2`-Dimethylcycloprop-`1`-ene
`2`-Methylbut-`2`- ene & `3`-Methylbut-`1`-ene

Solution :N//A
Discussion
13124.

Which of the following is used in the preparation of benzhydrol drop?

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Benzaldehyde
Benzophenone
ACETOPHENONE
Benzoin

SOLUTION :Acetophenone
Discussion
13125.

What are non-polar molecular solids ? Give example.

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Solution :(i) In non polar molecular solids, constituent molecules are held together by weak dispersion forces or London forces.
(ii) They have LOW MELTING points and are USUALLY in liquids or gaseous state at room TEMPERATURE. Eg., NAPHTHALENE, anthrancene.
Discussion
13126.

What inspired N. Bartlett for carrying out reaction between Xe and PtF_6 ?

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Solution :N. Bartlett prepared a red compound `O_(2)^(+)[PtF_(6)]^-`. He realised that the first ionisation enthalpy of `O_(2)`MOLECULE and Xe is nearly same. He made EFFORTS to prepare some TYPE of compound with Xe and successfully prepared a red compound `Xe^(+)[PtF_(6)]^(-)`.
Discussion
13127.

Which type of solids have long range order and sharp melting point ?

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SOLUTION :CRYSTALLINE SOLIDS
Discussion
13128.

Which statement is incorrect about peptide bond -oversetOoverset(||)C-ddot(N)H- ?

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C-N bond length in proteins is longer than USUAL bond length of C-N bond
Spectroscopic analysis show planar structre of `-underset(O)underset(||)(C)-NH`-GROUP
C-N bond length in protiens is smaller than usual bond length of C-N bond
None of the above

Solution :Peptide bond is formed by the REACTION of -COOH group of ONE amino acid with the `-NH_(2)` group of another amino acid and represented as

As partial double bond character found between C-N bondn . The bond length of C-N in protein should be smaller than usual C-N bond
Discussion
13129.

Which one is antacids ?

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`NaHCO_(3)`
`AL(OH)_(3)+MG(OH)_(2)` 
(A)and(B) both
`NaHSO_(3)` 

Solution :(A) and (B) both
Discussion
13130.

Which of the following reactions yield elementary gases like N_(2), H_(2), O_(2)as the byproducts ? I) CaO+NH_(3)rarr II) 2NH_(3)+2Na overset(Fe)underset(300-400^(@)C)rarr III) 8NH_(3)+3Cl_(2)rarr IV) 2Pb(NO_(3))_(2)overset(Delta)rarr

Answer»

I and II only
II, III and IV only
I, II and III only
All of these

Answer :D
Discussion
13131.

When 3.86 amperes current are passed through an electrolyte for 50 minutes, 2.4 gr of a divalent metal is deposited. The gram atomic weight of the metal (in grams) is

Answer»

24
12
64
40

Answer :D
Discussion
13132.

Which of the following has an optical isomer?

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`[CO(en)(NH_3)_2]^(2+)`
`[Co(H_2O)_4(en)]^(3+)`
`[Co(en)_2(NH_3)_2]^(3+)`
`[Co(NH_3)_3Cl]^+`

ANSWER :C
Discussion
13133.

Which orbital is not involved in the formation of PCl_(5) molecule :-

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s
`dz^(2)`
`dx^(2)-y^(2)`
`p_(Z)`

Solution :In `sp^(3)d`HYBRIDISATION `s, p_(x) , p_(y) , p_(z) and d_(z)^(2)` orbital INVOLVED.
Discussion
13134.

What is the efficiency of packing in case of a metal crystal for (i) simple cubic (ii) body-centred cubic (iii) face-centred cubic (with the assumptions that atoms are touching each other)

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SOLUTION :(i) 52.4% (II) 68% (III) 74%
Discussion
13135.

Which of the following is not pair of chain isomers :-

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`{:(""CH_(3) ""CH_(2)-OH), (""|""|), (CH_(3)-C-CH_(3)& CH_(3)-CH-CH_(3)),(""|),(""OH):}`

Answer :D
Discussion
13136.

What are proteins ? Discuss briefly the structure of proteins .

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Solution :Proteins . Proteins are complex nitrogeneous organic compounds found in animals and plants. These are essential constituents of all living cells. Structurally, proteins are long polymers of amino acids linked by peptide bond.
Structure of proteins . Proteins are obtained from amino acids. A protein molecule contains 50 to several thousand amino acid molecules joined by peptide bonds. The structures of proteins may be DISCUSSED as follows : 1. Primary structure. The order in which the amino acids are attached in one or more polypeptide chains of a protein is called the primary structure of protein. The amino acid sequence of a protein determines its function and is critical to its biological activity. Even a change of one amino acid can change drastically the properties of the entire protein. For example, a normal haemoglobin has 574 amino acid units—changing just one amino acid in the sequence results in defective haemoglobin found in proteins suffering from sickle CELL anaemia.
Normal haemoglobin
Val - His - Leu - Thr - Pro - Glu - Glu - Lys -
Sickle cell haemoglobin
- Val - His - Leu - Thr - Pro - Val-Glu - Lys -
2. Secondary structure. The secondary structure gives the manner in which protein chain is folded or bent. This arises from the plane geometry of the peptide bond and hydrogen bonds between one region of the backbone to another.
PAULING and Corey investigated the structures of many proteins with the help of X-rays patterns. It was observed that in many proteins, polypeptide chains are coiled up in the form of a spiral staircase called helix or `alpha`-helix. The helical shape results from the formation of hydrogen bonds between amino acids in the peptide chain. This structure can be imagined as if one can coil a polypeptide chain AROUND an invisible cylinder.
In addition, the another type of secondary structures are also known such as `BETA`-pleated sheet and triple helix.
3. Tertiary structure. The tertiary structure is the three-dimensional structure of globular protein. This arises due to folding, coiling and bending of polypeptide chains producing three-dimensional structures which are called tertiary structures. This structure gives the overall state of proteins. The tertiary structure of a protein can be obtained due to folding and superimposition of various secondary structures.
Discussion
13137.

Which of the following statements is correct about D-Glucose & D-Galactose compounds?

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They are DIASTEREOMERS
Both are COMPONENTS of lactose
They are `C-4` EPIMERS
All the above are correct

ANSWER :D
Discussion
13138.

The temperature at which the vapour pressure of a liquid equals external pressure is called

Answer»

f.p.
B.p.
m.p.
critical temp

Answer :B
Discussion
13139.

Which of the following reactions is an example of auto reduction ?

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`Fe_3O_4 +4CO RARR 3Fe+4CO_2`
`Cu_2O+C rarr 2CU +CO`
`CU^(2+)(aq) +Fe(s) rarr Cu(s) +Fe^(2+)(aq)`
`Cu_2O+1/2Cu_2S rarr 3Cu+1/2SO_2`

ANSWER :D
Discussion
13140.

Which is more reactive in each pair towards S_(N) reaction ? (A) CH_(3)overset(O)overset(||)C Cl or CH_(3)Cl (B) (C) CH_(3)overset(O)overset(||)Cooverset(O)overset(||)C CH_(3) or CH_(3)OCH_(3)

Answer»


ANSWER :(A) `CH_(3)overset(O)overset(||)C Cl` (B) `(##ALN_CHM_C09(II)_E01_776_A01##)` (C) `CH_(3)overset(O)overset(||)Cooverset(O)overset(||)CCH_(3)`
Discussion
13141.

Which of the following metas displaces SO_(2) gas from concentrated sulphuric acid

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`MG`
`ZN`
`Cu`
NONE of these

Solution :`Cu+2H_(2)SO_(4)rarrCuSO_(4)+SO_(2)+2H_(2)O`
Discussion
13142.

Which of the following pairs are correctly matched? 1. Haber process.......Manufacture of ammonia 2. Bayer process.. .............. Manufacture of sulphuric acid 3. Birkeland-Eyde process......... Manufacture of nitric acid 4. Solvay process. ...................Manufacture of sodium carbonate Select the correct answer using the codes given below:

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 2, 3 and 4
1, 3 and 4
1, 2 and 4
1, 2 and 3:

ANSWER :B
Discussion
13143.

Write the IUPACname for CH_(3)-CH(CH_(3))-CH_(2)CI

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SOLUTION :1-Chloro-2-methylpropane
Discussion
13144.

Which one of the following metallic oxides exhibits amphoteric nature?

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BAO
`Al_(2)O_(3)`
`Na_(2)O`
CaO

Answer :B
Discussion
13145.

ZntoZn^(2+)+2e is an example of:

Answer»

OXIDATION process
Reduction process
Redox process
Reversible process.

Answer :A
Discussion
13146.

What are freons? How are they prepared?

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Solution :Chlorofluorocarbon compounds are called FREONS. DICHLORODIFLUOROMETHANE is commonly called freon 12. It is prepared by the reaction of antimony TRIFLUORIDE on carbontetrachloride at `140^(@)C` using antimony PENTACHLORIDE as CATALYST.
Discussion
13147.

Transition state is defined as the state of a reaction , which contains________.

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MINIMUM energy
maximum energy
zero energy
Kinetic energy

Answer :B
Discussion
13148.

Which one of the following gives iodoform test

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Formaldehyde
Ethyl alcohol
Benzyl alcohol
Benzaldehyde

Solution :The COMPOUND having `alpha`-hydrogen will give iodoform TEST. Ethyl alcohol and secondary ALCOHOLS also give positive iodoform test because by the action of halogens in alkaline medium, they are oxidised to acetaldehyde and METHYL ketones RESPECTIVELY.
Discussion
13149.

Which of the following will not produce benzoic acid by oxidation with alkaline KMnO_(4) ?

Answer»

`Ph-CH_(3)`
`Ph-CH_(2)-CL`
`Ph-CH_(2)CH_(3)`
`Ph-OVERSET(CH_(3))overset(|)underset(CH_(3))underset(|)C-CH_(3)`

Answer :D
Discussion
13150.

Which method of refining is generally used when a metal of high degree of purity is needed?

Answer»

SOLUTION :ZONE REFINING METHOD.
Discussion