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8001.

What is the end product of the following sequence of operations CaC_2overset(H_2O)to A underset(Hg^"++")overset(dil.H_2SO_4)to B underset(H_2)overset(Ni)to C

Answer»

METHYL alcohol
ACETALDEHYDE
`C_2H_5OH`
`C_2H_4`

SOLUTION :`CaC_2overset(H_2O)to underset"Acetylene"(HC-=CH)underset(Hg^(+2))OVERSET(Dil. H_2SO_4)to underset"Acetaldehyde"(CH_3CHO)underset(H_2)overset(Ni)to underset"ETHYL alcohol"(CH_3CH_2-OH)`
Discussion
8002.

The synthesis of carbohydrates in plants is mainly due to :

Answer»

Double DECOMPOSITION
PHOTOSYNTHESIS
Hydrolysis of INGREDIENTS taken from soil
Nitrifying bacteria

ANSWER :B
Discussion
8003.

Which of the following pairs can be differentiated ?

Answer»

1-butyne and 2-butyne
Ethane and ethene
Ethane and ethyne
2-hexyne and 3-hexyne

Solution :N//A
Discussion
8004.

Which of the following statement is correct regarding case of dehydration in alcohols

Answer»

Primary `GT` Secondary
Secondary `gt` Tertiary
Tertiary `gt` Primary
None of these

Solution :Correct order of DEHYDRATION in alcohols `3^(@) gt 2^(@) gt 1^(@)`.
Discussion
8005.

Which of the followingaminesgives a characteristicoffensiveodourof isocyanidewhenheatedwith chloroform and causticpotash ?

Answer»

`CH_(3) NH_(2)`
`(CH_(2))_(2) NH`
`(CH_(3))_(3)N`
`(C_(6)H_(5))_(2) NH`

Solution :Primaryaminewhenheatedwith chloroformandcausticpotashgivesisocyanide .
Discussion
8006.

Whichone of theproduct is formed when glucosereactswith bromine water ?

Answer»

n-hexane
GLUCONIC ACID
Saccharic acid
Hexanoicacid

ANSWER :B
Discussion
8007.

What transition in the hydrogen spectrum would have the same wavelength as the Balmer transition (n = 4 to n = 2 of He^+spectrum)?

Answer»

SOLUTION :N = 2 to n = 1
Discussion
8008.

Write the IUPAC name of [Pt(NH_(3))_(4)Cl_(2)]Cl_(2).

Answer»

SOLUTION :Tetraamminedichloridoplatinum(II) CHLORIDE.
Discussion
8009.

When vapours of PH_3 are passed into water through delivery tube, the bubble of gas formed when comes in contact with air, forms a ring of smoke. These are due to formation of

Answer»

`P_4O_10`
`H_3PO_4`
`PCl_4`
`P_4`

Solution :`(NH_4)_2SO_4 + H_2O to underset"(STRONG ACID)"(2H_2SO_4 + NH_4OH)`
HENCE FERTILITY increases
Discussion
8010.

Which alkylbromide will yield-3-methyl-1-hexene as the major product upon treatment with potassium tbutoxide in t-butyl alcohol (solvent) ?

Answer»




ANSWER :D
Discussion
8011.

When ZnS and PbS minerals are present together, Then NaCN added to separate them in the froth floation process as a depressant, beacuse :-

Answer»

`Pb (CN)_(2)` is PRECIPITATED while no EFFECT on ZnS
ZnS forms soluble COMPLEX `Na_(2)[Zn(CN)_(4)]`
PbS forms soluble complex `Na_(2)[Pb (CN_(4))]`
If decreases the floatation property of PbS by making it hydrophillic

Answer :B
Discussion
8012.

The standard enthalpy of formation of CO_(2)(g), H_(2)O(l) and glucose (s) at 25^(@)C are -400.0 kJ mol^(-1),-300.0 kJ mol^(-1) and -1300.0 kJ mol^(-1) respectively. The standard enthalpy of combustion per gram of glucose at 25^(@)C is

Answer»

`+ 2900 KJ`
`- 2900 kJ`
`- 16.11 kJ`
`+ 16.11 kJ`

ANSWER :C
Discussion
8013.

Which one of the following is used as cathode in Lithium ion battery?

Answer»

Porous GRAPHITE
Lithium
`CoO_2`
CHROMIUM

ANSWER :C
Discussion
8014.

What are the forces exist in physical adsorption?

Answer»

Solution :`implies` In physical adsorption, physical FORCES like van DER Waals FORCE of attraction exist between adsorbent and adsorbate.
`implies`The other forces that can cause physical adsorption are (i) dipole-dipole INTERACTION (ii) DISPERSION forces.
Discussion
8015.

Two volatile and miscible liquids can be separated by fraction distillation into pure components under the conditions when :

Answer»

they have low boiling points
the differences in their BOILLING points is LARGE
the boliling points of the liquids are CLOSE to each other
they do not from azeotrophic MIXTURE

SOLUTION :N//A
Discussion
8016.

Which substance is used as adsorbent in chromatographic method ?

Answer»

`Al_2O_3`
`SiO_2`
`MGO`
All the GIVEN 

ANSWER :A
Discussion
8017.

Which is a nucleophilic substitution reaction among the following?

Answer»

`CH_(3)-CH=CH_(2)+H_(2)Ooverset(H^(+))toCH_(3)-UNDERSET(OH)underset(|)(C)H-CH_(3)`
`RCHO+R''MgXoverset(H_(2)O //H^(+))toR-underset(OH)underset(|)(C)H-R''`
`CH_(3)-CH_(2)-OVERSET(CH_(3))overset(|)(C)H-CH_(2)-Br+NH_(3)toCH_(3)-CH_(2)-overset(CH_(3))overset(|)(C)H-CH_(2)-NH_(2)`.
`CH_(3)CHO+HCNtoCH_(3)CH(OH)CN`.

Solution :it is the CORRECT answer.
Discussion
8018.

Which of the following is IUPAC name of the compound formed from reduction of 2-butanone ?

Answer»

1-butanol
2-butanol
1-butanal
2-butanal

ANSWER :B
Discussion
8019.

XeF_(6) on complete hydrolysisproduces

Answer»

`XeOF_(4)`
`XeO_(2)F_(2)`
`XeO_(3)`
`XeO_(2)`

Solution :`XeO_(3)`
Discussion
8020.

What product will be obtained if 'W' is treated with C_6H_5MgBr followed by D_3O^(o+) and then by heating ?

Answer»




ANSWER :C
Discussion
8021.

Which of the following electrolytes will have maximum coagulating value for AgI//Ag^(+) sol?

Answer»

`Na_2S`
`Na_3PO_4`
`Na_2SO_4`
`NaCl`

Solution :`AgI // Ag^(+)`is a positively charged SOL and can be easily coagulated by adding negatively charged ions having high valency. Coagulation value is just the reverse of it. Electrolyte whose negative ION (anion) has least negative charge will require MAXIMUM amount and hence will have maximum coagulating value. THUS, `Cl^(-)` (from NaCl) will have maximum coagulating value.
Discussion
8022.

When SnCl_4 is treated with excess HCI, the complex [SnCl_6]^(2-)is formed. The oxidation state of Sn in this complex is :

Answer»

`+6`
`+4`
`-2`
`+2`

ANSWER :B
Discussion
8023.

Urotropine has the composition :

Answer»

`(CH_2)_4N_6`
`(CH_2)_5N_5`
`(CH_2)_6N_4`
`(CH_3)_6N_5`

ANSWER :C
Discussion
8024.

Thelowest degree of paramagnetism is shown by :

Answer»

`MnSO_4cdot4H_2O`
`FeSO_4cdot6H_2O`
`CuSO_4. 5H_2O`
`NiSO_4cdot6H_2O`

ANSWER :C
Discussion
8025.

The reductionof acetaldoxime gives

Answer»

`CH_(3) - CH_(2)-NH_(2)`
`CH_(3) - NH_(2)`
`(CH_(3))_(3)C-NH_(2)`
`CH_(3)-NH-CH_(3)`

ANSWER :A
Discussion
8026.

What does k_b value for an amine stand for ?

Answer»

Solution :The BASIC strength of amines is expressed in TERMS of `k_b` . GREATER the VALUE of `k_b`,more is the basic strength of AMINE.
Discussion
8027.

Which one is the seniormost functional group in the nomenclature of an organic compound if it possesses more than one functional group ?

Answer»

-CHO
-COOH
-OH
`gtgtCO`

ANSWER :B
Discussion
8028.

What is [H^(+)] of a solution that is 0.01 M in HCN and 0.02 Min NaCN (K_(a) for HCN = 6.2 xx 10^(-10))

Answer»

`3.1 XX 10^(10)`
`6.2 xx 10^(5)`
`6.2 xx 10^(-10)`
`3.1 xx 10^(-10)`

Solution :`K_(a) = ([H^(+)][CN^(-)])/([HCN^(-)]) rArr 6.2 xx 10^(-10) = ([H^(+)] [0.02])/([0.01])`
`[H^(+)] = (6.2 xx 10^(-10) xx 0.01)/(0.02) = 3.1 xx 10^(-10)`.
Discussion
8029.

What is the pH of the resulting olution when equal volumes of 0.1 M NaOH and 0.01 M HCl are mixed

Answer»

12.65
2
7
1.04

Answer :A
Discussion
8030.

Which one of the following is used in tanning of leather?

Answer»

chromium salt
colloidal AU
ARGYROL
`Fe(OH)_3`

SOLUTION :chromium salt
Discussion
8031.

What are ambident nucleophiles? Explain with an example.

Answer»

Solution :Nucleophiles which can attack through two different sites are called ambident nucleophiles. For example, CYANIDE ION is a resonance HYBRID of the following two STRUCTURES. It can attack either through CARBON to form cyanides or through N to form isocyanides or carbylamines.
Discussion
8032.

The unit cell that best describe the CsCl crystal lattice is

Answer»

BCC unit cell
SIMPLE cubic unit cell
FCC unit cell
HCP unit cell

Answer :B
Discussion
8033.

Which metal is used in making cathode containers of dry cell?

Answer»

Zn
Bi
Cr
Fe

Answer :C
Discussion
8034.

Which of the following description of hybridisation is not correct?

Answer»

`[Fe(CN)_(6)]^(4-) : d^(2)sp^(3)`
`[Ni(CN)_(4)]^(2-) : DSP^(2)`
`[Cu(NH_(3))_(4)]^(2+):sp^(3)`
`[Ni(CO)_(4)]:sp^(3)`

Answer :C
Discussion
8035.

Which oxychloride has maximum pH

Answer»

NACLO
`NaClO_(3)`
`NaClO_(3)`
`NaClO_(4)`

SOLUTION :Maximum pH HCLO is a WEAK acid all of these. So that the salt of weak acid is also weak.
Discussion
8036.

What do you mean by auto ionisation of water?

Answer»

Solution :Pure water itself has a LITTLE tendency to dissociate. i.e,. ONE water molecules donates a proton to an another water molecule. This known as AUTO IONISATION of water and it is REPRESENTED as below
Discussion
8037.

Which of the given statement is incorrect ?

Answer»

`He` is used in production of powerful super CONDUCTING magnets
`He` is used for carrying out experiments at low temperature as a cryogenic AGENT
`He` is used as an INERT shield for arc welding
`He` is used in filling the GAS balloons instead of `H_2` gas, because He is lighter than inflammable

ANSWER :D
Discussion
8038.

Which of the following can help to predict the rate of reaction if the standard Gibb's free energy of reaction (Delta_rG^@) is known ?

Answer»

Equilibrium constant
`Delta_rH^@`
`Delta_rU^@`
HEAT LIBERATED during the course of reaction in calorimeter

Answer :A
Discussion
8039.

When limestone is heated, CO_(2) is given off. The metallurgical operation is

Answer»

smelting
reducting
calcination
roasting

Solution :Conversion of an ore (CARBONATE) into its oxide by heating in absence of air is called calcination.
`underset("Limestone")(CaCO_(3))overset(Delta)rarr underset(underset("oxide")("Calcium"))(CaO) + CO_(2) uarr`
Discussion
8040.

Which of the following respond to litmus test?

Answer»

`1`. RESORCINOL
`2`. Benzoic Acid
`3`. ANILINE
`4`. Benzamide

Solution :Resorcinol and Benzoic acid responds litnous test.
Discussion
8041.

Which of the following MO's has two nodal planes?

Answer»

`pi2p_(y)`
`sigma2s`
`pi^(**)2p_(y)`
`sigma^(**)2p_(Z)`

SOLUTION :
`a pi 1p_(y) rArr` ONE nodal plane
`b sigma 2s rArr` zero nodal plane
c `pi^( * *)2p_(y) rArr` two nodal plane
`d sigma^( * *) 2p_(z) rArr` one nodal plane
Discussion
8042.

Write the Nernst equation for the E_(cell) reaction in the Daniell cell. How will the E_(cell) be affected when concentration of Zn^(2+) ions is increased ?

Answer»

Solution :* Nernst equation for DANIELL cell is as follows:
`E_(cell)=E_(cell)^(@)-(0.0591)/(2)log_(10)[(ZN^(2+))/(Cu^(2+))]`
* If concentration of `Zn^(2+)` ions increases, `E_(cell)` value GET DECREASES.
* On increase in concentration of `Zn^(2+)` it increases the value of,
`[(Zn^(2+))/(Cu^(2+))]` so `log[(Zn^(2+))/(Cu^(2+))]` value increases.
* So, subtractive value of `E_(cell)^(Theta)` ALSO increases, hence, `E_(cell)` get decreases.
Discussion
8043.

Which of the following is non-ionizable:

Answer»

`[CO(NH_3)_3CI_3]`
`[Co(NH_3)_4CI_2]CI`
`[Co(NH_3)_5CI]CI_2`
`[Co(NH_3)_6]CI_2`

ANSWER :A
Discussion
8044.

The unit of entropy are:

Answer»

`J K^-1 mol^-1`
`KJ^-1 mol^-1`
`kJ mol^-1`
`J^-1K^-1 mol^-1`

ANSWER :A
Discussion
8045.

Which of the follwing undergoes nitration most readily?

Answer»

Toluene
Styrene
Chlorobenzene
phenol

Solution :More the `EDG` more is the `SE` reaction.
`(-OH)` group is more `ED` than other GROUPS.
`SE` order is `(d) GT (a) gt (b) gt (C)`
Discussion
8046.

underset((ii)H_(3)O^(+))overset((i)CH_(3)MgBr)to (R) underset((ii)Delta)overset("dil."NaOH)to

Answer»

proppane nitrile
ethane nitrile
nitromethane
methyl isocyanate

Answer :C
Discussion
8047.

What is the mass of precipitate formed when 50 mL of 16.9% solution of silver nitrate is mixed with 50 mL of 5.8% NaCl solution? (Ag = 107.8 g, N = 14, O = 16, Na = 23, Cl = 35.5)

Answer»

7 g
14 g
28 g
3.5 g

Solution :50 mL of `16.9%AgNO_(3)` solution contaion `AgNO_(3)`
`=(16.9)/(100)xx50=8.45g`
50 mL of `5.8%` NACL solution contains NaCl
`=(5.8)/(100)xx50=2.9g`
`{:(""AgNO_(3),+,NaCl,rarr,AgCl + NaNO_(3)),(107.8+14+48,+,23+35.5,,108+35.5),(=169.8g,,=58.5g,,=143.5g):}`
`8.45" g of "AgNO_(3)` reacts with `NaCl=(58.5)/(169.8)xx8.45g`
`=2.9g`
Thus, the amounts present react completely
`therefore"AgCl FORMED"=(143.5)/(169.8)xx8.45g~=7g`
Discussion
8048.

Which one of the following arrangements do not give the correct picture of the trends indicated against it ?

Answer»

`F_(2) gt Cl_(2) gt Br_(2) gt I_(2)` : Bond DISSOCIATION ENERGY
`F_(2) gt Cl_(2) gt Br_(2) gt I_(2)` : ELECTRONEGATIVITY
`F_(2) gt Cl_(2) gt Br_(2) gt I_(2)` : Oxidizing power
`F_(2) gt Cl_(2) gt Br_(2) gt I_(2)` : Electron gain enthalpy

Solution :(a) Bond dissociation energy decreases in the order : `Cl_(2) gt Br_(2) gt F_(2) gt I_(2)`
(d) Negative electron gain enthalpy decreases in the order : `Cl_(2) gt F_(2) gt Br_(2) gt I_(2)`.
Discussion
8049.

What will be the theoritical value of spin only magnetic moment when Fe(SCN)_(3) reacts with a solution containing F ion to yield a complex

Answer»

2.83 BM
3.87 BM
5.92 BM
1.73 BM

Solution :Both `SCN^(-)` and `F^(-)` are weak field LIGANDS. So, Fe(III) will have `t_(2g)^(3)e_(G)^(2)`configuration, with 5 unpaired electrons.
`mu_(s)=SQRT(n(n+2))=sqrt(5(5+2))=5.92 BM`.
Discussion
8050.

Which would quickly absorb oxygen ?

Answer»

ALKALINE SOLUTION of pyrogallic acid
Concentrated SULPHURIC acid
Lime water
Alkaline solution of COPPER sulphate

Answer :A
Discussion