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23501.

Which of the following theory, is not related to chemical kinetics ?

Answer»

COLLISION theory
Activated COMPLEX theory
Absolute reaction RATE theory
VSEPR theory

Answer :D
Discussion
23502.

Which is correct about saccharin ?

Answer»


It is 600 times SWEETER than SUGAR
It is used as SWEETENING AGENT
All of the above

Answer :D
Discussion
23503.

Which of the following is the correct representation of 1-amino acids?

Answer»




ANSWER :A
Discussion
23504.

What are interstitial compounds ? Give example.

Answer»

Solution :When SMALL atoms like C, H, B and N OCCUPY INTERSTITIAL site in their lattice. Example, TiC, `Fe_(3)H_(3)`
Discussion
23505.

Which of the following systems are conjugated?

Answer»


SOLUTION :N/A
Discussion
23506.

Which of the following is not optically active?

Answer»

cis - `[Rh(en)_(2)Cl_(2)]`
`[Cr(o x)_(3)]^(3-)`
trans - `[Co(en)_(2)Cl_(2)]+`
`[Co(en)(NH_(3))_(2)Cl_(2)]^(+)`.

Answer :C
Discussion
23507.

Which of the following reaction is a part of Hall's process?

Answer»

`Al_(2)O_(3)+2NaOH to 2NaAlO_(2)+H_(2)O`
`Fe_(2)O_(3)+2Al to 2Fe+Al_(2)O_(3)`
`AIN+3H_(2)O to Al(OH)_(3)+NH_(3)`
`Al_(2)O_(3).2H_(2)O+2Na_(2)CO_(3) to 2NaAlO_(2)+CO_(2)+2H_(2)O`

Answer :D
Discussion
23508.

Which of the following orders is/are incorrect ?

Answer»

`H_3PO_4 gt H_3PO_3 gt H_3PO_2`(reducing character)
`N_2O LT NO lt N_2O_3 lt N_2O_5` (oxidation state on nitrogen atom)
`NH_3 gt PH_3 gtAsH_3 gt SbH_3`(basicity)
`SbH_3 gt NH_3 gt AsH_3 gt PH_3` (reducing character )

Solution :(A)As number of reducing hydrogen increases , the reducing character ALSO increases . In `H_3PO_4` there is no reducing hydrogen so it should be least reducing . Correct ORDER is `H_3PO_2 gt H_3PO_3 gt H_3PO_4`
(B)+1 lt +2 lt +3 lt +5
(C )down the group the availability of lone pair of electrons DECRESES as they are present in more concentrated s-orbital
(D)As down the group bond energy decreases, the removal of H becomes easier. so correct order is `SbH_3 gt AsH_3 gt PH_3 gt NH_3`
Discussion
23509.

Which of the following are correctly matched ?

Answer»

Butter-gel
Milk-emulsion
For-AEROSOL
DUST-SOLID SOL

SOLUTION :Dust is an aerosol an not a solid sol.
Discussion
23510.

What electron transition in the He^(+) spectrum would have the same wavelength as the first Lyman transition of hydrogen.

Answer»


ANSWER :`n=4` to `n=2`
Discussion
23511.

What is the use of Clark's method?

Answer»

REMOVE temporary hardness of water by adding quick LIME or SLAKED lime
Remove PERMANENT hardness by adding WASHING soda
Remove permanent hardness by adding permutit.
Remove temporary hardness by boiling

Answer :A
Discussion
23512.

Which element occurs in native state

Answer»

I
S
P
Mg

Answer :A
Discussion
23513.

Which of the following orders is true regarding the acidic nature of phenol?

Answer»

Phenol `gt`O-cresol `gt`O-NITROPHENOL
O-cresol `lt` phenol `lt` O-nitrophenol
phenol `lt` 0-cresol `gt`O-nitrophenol
phenol `lt` O-cresol `lt` O-nitrophenol III

Solution :PRESENCE of electron releasing group like CH3 over benzene nucleus destabilises the phenoxide ion, thus decreases the acidity of phenol where as Presence of electron withdrawing group like `NO_2` stabilises the phonoxide ion and thus increases acidity of Phenol, HENCE ORDER of acidity will be O-cresol `lt` phenol `lt`O- nitrophenol
Discussion
23514.

Which one of the following is not a method of concentration of metals?

Answer»

gravity separation
FROTH FLOATATION process
ELECTROMAGNETIC separation
smelting

Answer :D
Discussion
23515.

Which of the follwing compounds will undergo Friedel Creadfts alylation with faster rate?

Answer»




Solution :More the `EDG` faster is the `SE` reaction or `F.C` reaction.
But `ED` power of `(-NH_(2))` (by resonance) is greater than `(-CH_(3))` (by hyperconjugation). But anilline does not undergo `F.C` reaction.
Therefore, in (a) three `H.C` STRUCTURES.
In (c) one `H.C` STURCTURES.
in (d),`(-NO_(2)) EWG, F.C` reaction does not take place.
So in (b) `F.C` reaction is FASTED.
Discussion
23516.

Write the IUPAC name of the following CH_(3)-underset(CH_(3))underset(|)overset(CH_(3))overset(|)(C)-OH

Answer»

SOLUTION :2-Methylpropan-2-ol.
Discussion
23517.

What are the demerits of Werner's theory?

Answer»

SOLUTION : (1) The theory is not BASED on electrons.
(2) It does not explain how a NEGATIVE ligand can satisfy both primary and SECONDARY valencies of a central metal ion.
Discussion
23518.

Write the chemical equation for the preparation of toluene by Wurtz-Fittig reaction.

Answer»

SOLUTION :
Discussion
23519.

Which of the following statement(s) is/are correct regarding Ni(CO)_(4)? (P) It has tetrahedral geometry. It is diamagnetic in nature. (R ) It has all Ni-C bonds of equal length.

Answer»

<P>P, Q
P, R
Q, R
P, Q, R

Answer :D
Discussion
23520.

Which of the following compounds will give significant amount of meta- product during mononitration reaction?

Answer»




ANSWER :C
Discussion
23521.

Which of the following sets of diseases is caused by bacteria?

Answer»

Malaria
Tuberculosis
Dysentery
Syphilis.

Answer :B
Discussion
23522.

When aniline is heated with chloroform and alcoholic KOH, a foul smelling product is formed. It is :

Answer»

CARBYL cyanide
Aniline isocyanide
Phenyl isocyanide
Benzo aniline.

Answer :C
Discussion
23523.

What is DDT among the following

Answer»

GREENHOUSE gas
A fertilizer
Biodegradable POLLUTANT
Non-biodegradable pollutant

Solution :DDT is a non-biodegradable pollutant
Discussion
23524.

Which are is biomolecule ?

Answer»

Carbohydrates
Lipid
Nucleic acid
All of these 

SOLUTION :All of these
Discussion
23525.

When n-butyl magnesium iodide is treated with water the product is :

Answer»

ISO butane
n- butane
Alcohol
Propane

Answer :B
Discussion
23526.

Which of the following will have highest PH in water solution :

Answer»

NACL
`Na_2CO_3`
KCL
`CuSO_4`

ANSWER :B
Discussion
23527.

Whichof the following is used as antiseptic in medicated soaps ?

Answer»

phenol
`H^(2)O^(2)`
IDOFORM
BITHIONAL and 1% phenol

Answer :D
Discussion
23528.

Which of the following ore is oxide ore ?

Answer»

Malachite 
Cuprite 
Calamine 
ZINC blende 

Solution :(A) Malachite : `CuCO_3, Cu(OH)_(2)`
(B) Cuprite : `Cu_(2)O …` oxide
(C ) Calamine : `ZnCO_3`
(D) Zinc blends : ZnS
Discussion
23529.

The root mean square speed of oxygen at 27^(@)C is 760 cm s^(-1). The root mean square speed of hydrogen at the same temperature will be :

Answer»

3040 cm `s^(-1)`
190 cm `s^(-1)`
`1520 cm s^(-1)`
760 cm `s^(-1)`

Solution :`( mu ( O_(2)))/( mu ( H_(2))) = sqrt(( 2 )/( 32)) = sqrt(( 1 )/( 16)) = ( 1)/( 4)`
`:. mu ( H_(2)) = mu ( O_(2)) XX 4 `
`= 760 xx 4 = 3040cm s^(-1)`
Discussion
23530.

Which of the following statement(s) is/are with true ?

Answer»

Soluble bicarbonates give white precipitate with `MgCI_(2)` in cold
Soluble calcium bicarbonates give white precipitate with dilute amonia solution FOLLOWED by `MgSO_(4)`.
Bicarbonates are generlly soluble in water
`Hg(II)` chloride forms a reddish-brown precipitate in a solution of soluble carbonate.

Solution :a.`2HCO_(3)^(Theta) + Mg^(2+) overset("Cold") to Mg (HCO_(3))_(2) ("soluble") overset(Delta) to MgCO_(3) + CO_(2) + 2H_(2)O`
b.`Ca(HCO_(3))_(2) + 2NH_(3) rarr (NH_(4))_(2) CO_(3) + CaCO_(3) darr`
c. True STATEMENT
d. `CO_(3)^(2-) + 4Hg^(2+) + 3H_(2)O rarr Hg_(4)O_(3)CO_(3) darr` (reddish brown ) or `HgCO_(3),3HO + 6H^(o+)`
Discussion
23531.

When phenol is reacted with CHCl_3 and NaOH, followed by treatment with LiAlH_4 gives

Answer»

m-hydroxy METHYL phenol
p-hydroxy methyl phenol
a-hydroxy methyl phenol
a-hydroxy methyl phenol

Answer :C
Discussion
23532.

Two litres of ammonia at 30^(@) C and 0.90 atmosphere pressure neutralised 134 mL of a solution of sulphuric acid . Calculate the normality of the acid .

Answer»

Solution :Volume of `NH_(3)" at NTP "= (0.9 xx 273)/(303) " lit " = 1.62 ` lit .
` :. ` numbers of moles of `NH_(3)= (" volume at NTP (litres)")/(22.4)`
` = (1.622)/(22.4) = 0.0724`
Number of equivalents of `NH_(3)`
= number of moles `xx` factor relating mol.e wt . eq.wt . ....(Eqn. 6ii)
` = 0.0724`
`{:( :."ACCORDING to the reaction "2NH_(3)+H_(2)SO_(4)to(NH_(4))_(2)SO_(4)) ,(" eq. wt of " NH_(3)"is equal to its mol.wt"):}`
` :. ` m.e of `NH_(3) ` = equivalent xx1000
` = 0.0724 xx1000 = 72.4`
Let the normality of `H_(2)SO_(4)` be N
` :. ` m.e of `H_(2)SO_(4) = N xx 134`
Now m.e of `H_(2)SO_(4) ` = m.e of `NH_(3)` ...(Eqn.2)
` 134 xx N = 72.4`
` :. ` normality of `H_(2)SO_(4) = (72.4)/(134)`
` = 0.54 N `
Discussion
23533.

When conc. H_2SO_4comes in contact with sugar, it becomes black due to

Answer»

hydrolysis
hydration
DECOLOURISATION
dehydration

Solution :`H_2SO_4` is a STRONG DEHYDRATING AGENT.
Discussion
23534.

Whichone of thefollowing compounds is not aromatic ?

Answer»




Discussion
23535.

Which of the following absorbs carbon dioxide and releases oxygen ?

Answer»

CaO
`KO_(2)`
KOH
`K_(2)O`

Solution :Equation: `2KO_(2) + CO_(2) to K_(2)CO_(3) + 3//2O_(2)`
Discussion
23536.

Which one of the following is moderately basic?

Answer»

`SO_(2)`
`SeO_(2)`
`TeO_(2)`
`PoO_(2)`

Solution :The ACIDIC character of oxides decreases matter DESCENDING the group, whereas the basic character increases on MOVING down the group.
Discussion
23537.

Which of the following is/are non-reducing sugars?

Answer»

Fructose
Glucose
Sucrose
Lactose

Answer :B
Discussion
23538.

Which type of hybridisation is present in iodine pentachloride ?

Answer»

`SP^(3)d^(2)`
`sp^(3)d`
`DSP^(3)`
`d^(2)sp^(3)`

ANSWER :A
Discussion
23539.

Which gas is used in aerated water :

Answer»

WATER VAPOURS
`CO_2`
`CO`
`SO_2`

ANSWER :B
Discussion
23540.

Which is not correct regarding copper sulphate ?

Answer»

It reacts with NAOH and glucose to give
It reacts with KCl to give `Cu_2Cl_2`
It GIVES CuO on strong HEATING in air
It reacts with KL to give iodine

Answer :B
Discussion
23541.

Which one of the following is diamagnetic?

Answer»

`Co^(2+)`
`CU^(2+)`
`MN^(2+)`
`SC^(3+)`

Answer :D
Discussion
23542.

Which of the following compounds will give positive iodoform test? Butan-1-ol, Butan-2-ol, tert- butylalcohol, Ethanol, Propanal, Propanone, Butan- 2-one, Pentan-3-one, Cyclohexanone, 1-Methyl- cyclohexanol, 1-Phenyl ethanol, 2-Phenylethanol.

Answer»

SOLUTION :Butan-2-ol, ETHANOL, Butan-2-one, PROPANONE.
Discussion
23543.

Which is not a silver ore ?

Answer»

Argentite
Siderite
Horn silver
Ruby silver

Answer :B
Discussion
23544.

Which of the following statement is not true aboutH_(2)Oand D_(2)O

Answer»

DIELECTRIC CONSTATN of `d_(2)o` is less than thatof `h_(2)o`
melting point of `d_(2)o`is more that of `H_(2)O`
DENSITY of `H_(2)O` is more than `D_(2)O`
BOILINGPOINTOF `H_(2)O` is less than that of `D_(2)O`

Answer :B
Discussion
23545.

When orange solution containing CrO_(7)^(2-) ion is treated with an alkali, a yellow solution is formed and when H+ ions are added to yellow solution, an orange solution is obtained. Explain why does this happen?

Answer»

Solution :On adding an alkali, `CrO_(7)^(2-)` is CHANGED to `CrO_(4)^(2-)` which is yellow in COLOUR. On adding an acid to `CrO_(4)^(2-)`, it is converted to `Cr_(2)O_(7)^(2-)`, which is orange in colour. This can be represented as under
`UNDERSET(("orange colour"))underset("Dichromate ion")(Cr_(2)O_(7)^(2-))OVERSET(OH^(-))underset(H^(+))iff underset(("yellow colour"))underset("Chromate ion")(CrO_(4)^(2-))`
Discussion
23546.

Which among the following can be a chiral center ?

Answer»

`C^(+)` of a carbocation
CARBON of a radical
an `SP^(2)` carbon
an `sp^(3)` carbon

Solution :`sp^(3)` carbon
Discussion
23547.

When iodoform is heated with silver powder it forms :

Answer»

Acetylene
Ethylene
Methane
Ethane

Answer :A
Discussion
23548.

Which of the following hexoses will form the same osazone when treated with excess phenylhydrazine ?

Answer»

D-glucose , D-fructose and D-galactose
D-glucose ,D-fructose and D-mannose
D-glucose, D-mannose and D-galactose
D-fructose , D-mannose and D-galactose

SOLUTION :D-glucose , D-fructose and D-mannose GIVE the same OSAZONE because they DIFFER in CONFIGURATION only at `C_1` and `C_2` but have the same configuration at `C_3,C_4 and C_5`.
Discussion
23549.

Write the general formula of Zwitter ionic form of an amino acid

Answer»

SOLUTION :Zwitter ionic FORM of an amino acid is
`R-underset(""^(o+)NH_(3))underset(|)(CH)-overset(O)overset(||)C-O^(-)" OR "R-underset(Noverset(+)H_(3))underset(|)overset(H)overset(|)C-COO^(-)`
Discussion
23550.

Which statement(s) is/are correct about the reaction:

Answer»



C. No reaction TAKES place in `(A), (B), (C )`, and `(D)`
d. No reaction takes place in `(E), (F)`, and `(G)`.

Solution :All reagents in (A), (B), (C ) and (D) react with EPOXIDES ti give the desired products.
The reagents in (E), (F), and (G) do not rect with epoxides.
Discussion