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23551.

Which two elements are in same period as well as same group of modern periodic table ?

Answer»

Z = 23, Z = 31
Z = 65, Z = 66
Z = 52, Z = 87
Z = 58, Z = 46

Answer :B
Discussion
23552.

Which of the following is used as a solvent in the Friedel-Crafts reaction :-

Answer»

Toluene
Nitrobenzene
Benzene
Aniline

ANSWER :B
Discussion
23553.

What is the maximum pH of a 0.1 M Mg^(2+) solution from which Mg(OH)_2 will not be precipitated [K = 1.2 xx10^(-11)]?

Answer»

`11.02 `
`8.40`
`6.42 `
`9.04`

Solution :When ` K_(sp )=k_(sp)`precipitation doesnotoccur
` THEREFORE[Mg^(2+)][OH^(-)]^2 = 1.2xx 10^(-11)`
` [OH^-]= sqrt(( 1.2 XX 10^(-11))/(0.1 ))=1.09 xx 10^(-5)`
POH`=5- log = 4.96thereforepH = 14 -4.96= 9.04`
Discussion
23554.

Write the overall cell reaction taking place in Daniel Cell

Answer»

SOLUTION :The overall cell reaction taking PLACE in DANIEL cell is.
`Zn+CU^(2+) to Zn^(2+) +Cu`.
Discussion
23555.

The repeating units of PTFE are

Answer»

`F_3C- CF_3`
`FCLC = CF_2 `
`F_2C = CF_2`
NONE of these

Solution :`F_2C = CF_2`
Discussion
23556.

Which of the following complexes is used as an anti-cancer agent ?

Answer»

MER-`[CO(NH_3)_3Cl_3]`
cis-`[PtCl_2(NH_3)_2]`
cis-`K_2[PtCl_2Br_2]`
`Na_2CoCl_4`

Answer :B
Discussion
23557.

Which one of the following is the coordination centity in k_(4)[Fe(CN)_(6)]^(4-) ?

Answer»

`4K^(+)`
`[FE(CN)_(6)]^(4-)`
`Fe^(2+)`
`CN^(-)`

ANSWER :B::C::D
Discussion
23558.

The uncertainity in the position of a moving bullet of mass 10 g is 10^(-5)m.Calculate the uncertainty in its velocity .

Answer»

SOLUTION :`5.25 XX 10^(-28) m SEC^(-1)`
Discussion
23559.

Which of the following amino acid is neutral

Answer»

GLYCINE
ASPARTIC acid
LYSINE
Arginine

Solution :Glycine `to H-UNDERSET(NH_(2))underset(|)(C)H-COOH` it contains equal no. of `-NH_(2)` and -COOH group
Discussion
23560.

What is the combining ratio of glycerol and fatty acids when they combine to form triglyceride?

Answer»

`3:4`
`3:2`
`1:3`
`1:2`

Solution :1 Molecule of glycerol COMBINE with 3 fatty acid MOLECULES to form TRIGLYCERIDE. Hence the ratio is `1:3`s
Discussion
23561.

Which of the following compound has ionic bond, pi-bond, co-ordinate bond and covalent bond :-

Answer»

`HNO_(2)`
`NaNO_(3)`
`KNO_(2)`
`MgCl_(2)`

SOLUTION :
Discussion
23562.

Two organic compound A and B react with sodium metal and release H_(2) gas. A and B react with each other to give ethyl acetate. The A and B are

Answer»

`CH_(3)COOH` and `C_(2)H_(5)OH`
`HCOOH " and " C_(2)H_(5)OH`
`CH_(3)COOH " and " CH_(3)OH`
`CH_(3)COOH " and " HCOOH`

ANSWER :A
Discussion
23563.

Which drug inhibit synthesis of prostaglandins?

Answer»

Paracetamol
Morphine
ASPIRIN
All of these 

SOLUTION :Aspirin
Discussion
23564.

Which of the following halide is capable of exhibiting enantiomerism ?

Answer»

ETHYL chlorine
Isopropyl bromide
sec-Butyl iodine
tert-Butyl chloride

Answer :C
Discussion
23565.

What is the density of H_(2)SO_(4) solution when lead storage cell stop producing electricity ?

Answer»

`1.25-1.30gm//ml`
`1.20-1.25gm//ml`
`1.10-1.15gm//ml`
`1.15-1.20gm//ml`

SOLUTION :`1.10-1.15gm//ml`
Discussion
23566.

Which of the following will show anisotropy?

Answer»

Glass
NaBr`
plastic
rubber

Answer :B
Discussion
23567.

Which of the following is/are isomers of methyl propanoate?

Answer»

BUTANOIC ACID
ETHYL ethanoate
Butane-1, 2-diol
Both (A) and (B)

ANSWER :D
Discussion
23568.

There are four elements 'p','q','r' and 's' having atomic numbers Z-1,Z,Z+1 and Z+2 respectively.If the element 'q' is an inert gas, select the correct answers from the following statements. (i)'p' has most negative electron gain enthalpy in the respective period. (ii)'r' is an alkali metal (iii)'s' exists in +2 oxidation state.

Answer»

(i) and (ii) only
(ii) and (III) only
(i) and (iii) only
(i),(ii) and (iii)

Solution :As 'q' is NOBLE gas, p,r and s having atomic number Z-1,Z+1 and Z+2 should belong to halogen , alkali metal and alkaline earth metal RESPECTIVELY.
As halogen has one electron less than stable noble gas configuration it has greater tendency to accept an additional electron forming anion . Alkaline earth metal having VALENCE shell configuration `ns^2` EXISTS in +2 oxidation state.
Discussion
23569.

What are the functions performed by histamine in the body ?

Answer»

SOLUTION :Histamine is a potent vasodilator.
(i) It contracts muscles in the gut and BRONCHI
(II) It RELAXES some other muscles, eg, in the walls of blood vessels
(iii) It is responsible for congestion in the nose associated with common cold and allergies
(iv) It stimulates the RELEASE of pepsin and HCI in the stomach.
Discussion
23570.

White smoke is formed when ammonia gas meets with:

Answer»

`WATER`
`HCL`
`H_2SO_4`
`HNO_3`

ANSWER :B
Discussion
23571.

Which of the following can give base OH^(-)

Answer»

`H_(2)O`
`H_(3)O^(+)`
`H_(2)`
HCl

Solution :`H_(2)O + H_(2)O hArr H_(3)O^(+) + OH^(-)`.
Discussion
23572.

Which of the following statements is/are correct? I. Glucose is reducing sugar II. Sucrose is reducing sugar III. Maltose is non reducing sugar IV. Lactose is reducing sugar

Answer»

I and II only
I and III only
I and IV only
All

Answer :C
Discussion
23573.

The values of colligative properties of colloidal solutions are of small order in comparision to those shown by true solutions of same concentration because of colloidal particles

Answer»

EXHIBIT enormous surface AREA.
remain SUSPENDED in the dispersion medium.
form lyophilic colloids.
are COMPARATIVELY less in number.

Solution :Number of colloidal particles is smaller in the same amount of the substance. It is because of large SIZE of colloidal particles.
Discussion
23574.

Which of the following statements is not correct

Answer»

amino acid can EXIST as inner salt
each polypeptide has ONE C-terminal and other N-terminal
enzymes are NATURALLY occurring simple proteins
the union of two amino acids produces two peptide LINKAGES 

Answer :D
Discussion
23575.

Which graph correctly correlates E_(cell) as a function of concentrations for the cell (for deifferent values of M and M):Zn(s) +Cu^(2+)(M) rarr Zn^(2+)(M) + Cu(s),E_(cell)^@=1.10V X- axis:log_(10)[Zn^(2+)]/[Cu^(2+)],Y-axis : E_(cell)

Answer»




ANSWER :B
Discussion
23576.

What is a primary battery? Give one example.

Answer»


ANSWER :
Discussion
23577.

Which one is common chief minerals for phosphorous and fluorine elements.

Answer»

FLUORSPAR
Fluorapatite
Chlorapatite
Cryolite

Solution :Fluorapatite : `Ca_9(PO_4)_6 CaF_2`
It has PHOSPHOROUS and fluorine both elements
Discussion
23578.

To precipitate negatively chargedsol, which cation is the most effective ?

Answer»

`NA^(+)`
`MG^(2+)`
`K^(+)`
`Al^(3+)`

ANSWER :D
Discussion
23579.

The substance used in pigment is :

Answer»

Lithopone
Borax
Alumina
None of these

Answer :A
Discussion
23580.

Which of the following complex will show geometrical as well as optical isomers?

Answer»

`[Pt(NH_(3))_(2)Cl_(2)]`
`[Pt(NH_(4))Cl_(2)]`
`[Pt(EN)_(2)]`
`[Pt(en)_(2)Cl_(2)]`

Answer :D
Discussion
23581.

Which of the following aqueous solutions will have a pH less than 7.0?

Answer»

`NH_4NO_3`
`NAOH`
`FeCI_3`
`Na_3PO_4`

SOLUTION :`NH_4 NO_3 ` and`FeCI_3`are SALTS ofstrongacidandweakbasewhichon hydrolysisproduceacidicsolutioni.e.,`PH lt7.0`
Discussion
23582.

When glycerin is added to a litre of water, which of the following behaviour is observed:

Answer»

Water evaporates more easily
The temperature of water increases
The freezing POINT of water is LOWERED
The VISCOSITY of water is lowered

Answer :C
Discussion
23583.

Which of the following is used in voltaic cell to represent a contract between electrode and electrolyte ?

Answer»

HORIZONTAL line
dotted VERTICAL line
double vertical
single vertical line

Solution :CONVENTION to REPRESENT the CELL.
Discussion
23584.

Which of the following is not chiral

Answer»

3-bromopentane
2-hydroxypropanoic ACID
2-butanol
2, 3-dibromopentane

Answer :A
Discussion
23585.

Which of thefollowingreaction is knownas "Balz-Schiemannreaction" ?

Answer»

`C_(6) H_(5) N_(2)^(+) CI^(-) + HBF_(4) toC_(6) H_(5)N_(2)^(+)BF_(4)^(-) overset( DELTA ) (to)C_(6)H_(5) F`
`C_(6) H_(5) - NH_(2)overset( CHCI + 3KOH) underset( Delta ) (to) C_(6) H_(5)- N^(+) = C^(-)`
`C_(6) H_(5)- N_(2)^(+) CI^(-) overset(Cu- Powder) underset( HX) (to) C_(6) H_(5)- X+ N_(2)+CuCI`
`C_(6) H_(5) CONH_(2) overset( Br_(2)+ 4NaOH ) underset( Delta) (to)C_(6) H_(5) -NH_(2)+ Na_(2) CO_(3) +2NaBr+ 2H_(2) O`

Solution :Introduction F- groupin presence of `HBF_(4)` iscalledBalz Schiemann REACTION
Discussion
23586.

Zinc, cadmium and mercury are generallynot considered as transition metals. Give reasons.

Answer»

Solution :These elements in their most common OXIDATION state of `+2` have COMPLETELY filled d-orbitals. HENCE, d-d TRANSITION cannotoccur.
Discussion
23587.

What is standard hydrogen electrode?

Answer»

Solution :STANDARD hydrogen electrode : It is electrode in which pure and DRY He) at l atm and 298 K is bubbled around a platinised platinum foil IMMERSED in 1M HCl solution where activity of `H^(+)` IONS is 1 M. It is represented as,
`H^(+)(1M)|H_(2)(g, 1"atm")Pt`
Discussion
23588.

Which one of the following statements about packing in solids is incorrect ?

Answer»

Coordination NWNBER in bee mode of packing is 8.
Coordination number in hcp mode of packing is 12
Void space in hcp mode of packing is 32%
Void space is CCP mode of packing is 26%

Solution :The hcp arrangement of ATOMS occupies 74% of the available space and thus has 26% VACANT space
Discussion
23589.

The total number of tertahedral voids face centred unit cell is

Answer»

6
8
10
12

Solution :In fcc UNIT CELL .
Number of atoms = 4
Total NUMBEROF TETRAHEDRAL voids`=2xx`number of ATMS`=2xx4=8`
Discussion
23590.

Which of the following is not a characteristic of chemisorption ?

Answer»

A) `DELTAH` is of the order of 240J
B) adsorption is irreversible
C) adsorption MAY be MULTIMOLECULAR layer
D) adsorption is specific

Solution :Adsorption may be multimolecular layer. In chemisorption UNIMOLECULAR layer is FORMED.
Discussion
23591.

Write the formula ofthe compounds i) hexaammineplatinum(IV) chloride (ii) dechlorido tetraamminecobalt (III) ion.

Answer»

Solution :i) `[Pt(NH_(3))_(6)]Cl_(4)`
ii) `[CO(NH_(3))_(4)Cl_(2)]^(+)`
Discussion
23592.

What is the structural feature characterising reducing sugars ?

Answer»

Solution :The MAIN structural feature of reducing SUGARS is the presence of an aldehyde group `(-CO)` such as in GLUCOSE, mannose, galactose , etc. . Or the `alpha` -KETOL GROUPING`(-CO-CH_2OH)` as present in fructose.
Discussion
23593.

What is meant by adsorption isotherm?

Answer»

SOLUTION :A PLOT between the AMOUNT of adsorbate adsorbed and pressure or concentration of adsorbate at CONSTANT temperature is called adsorption ISOTHERM.
Discussion
23594.

Which among the following compounds behave both as an electrophile as well a nucleophile? {:(underset("(1)")(CH_(2)=CH_(2))""underset("(2)")(CH_(2)=CH-overset(+)CH_(2))),(underset("(3)")(CH_(3)-overset(O)overset(||)C-CH_(3))""underset("(4)")(CH_(3)-overset(O)overset(||)C-Cl)):} Answer using the following codes:

Answer»

only (1)
(1) and (2)
(3) and (4)
(2), (3) and (4)

ANSWER :C
Discussion
23595.

Which of the following reactions takes place when a mixture of conc. HNO_(3) and H_(2)SO_(4) reacts with benzene at 350 K ?

Answer»

Sulphonation
Hydrogenation
Nitration
Dehydration

Answer :C
Discussion
23596.

Which of the following statements regarding theSN^2 reaction shown by alkyl halide is incorrect ?

Answer»

The REACTION takes PLACE is a SINGLE step
The `SN^2`reaction involves the inversion of the STEREOCHEMISTRY around carbon atom of the substrate
The rate of reaction DEPENDS on the steric bulk of the alkyl groups
The nucleophilicity of halides follows the order `Cl^(-) gt Br^(-) gt I^(-) `

Solution :The nucleophilicity of halides follows the order `Cl^(-) gt Br^(-) gt I^(-) `
Discussion
23597.

Which is the correct statement about birth control pills?

Answer»

Contain ESTROGEN only.
Contain PROGESTERONE only
Contain a MIXTURE of estrogen and progesterone derivatives
Progesterone ENHANCES ovulation.

Solution :Birth CONTROL pills contain a mixture of estrogen and progesterone derivatives.
Discussion
23598.

Which of the following is not a nitroderivative ?

Answer»

`C_(6)H_(5)NO_(2)`

`CH_(3) - UNDERSET(O)underset(darr)(N) = O`
`CH_(3)CH_(2)ONO`

Solution :`CH_(3)CH_(2)ONO` is ethyl nitrile.
Discussion
23599.

Which of the following set of combination is incorrect ?

Answer»

<P>(III), (i), (R)
(I), (i), (P)
(IV), (iii), (Q)
(III), (iv), (S)

ANSWER :D
Discussion
23600.

Which of the following is the female sex hormone

Answer»

Estrone
Testostrene
Cortisone
Thyroxine

Answer :A
Discussion