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3851.

Which of the following is example of mixed oxides?

Answer»

`Mn_(2)O_(7)`
MnO
`Mn_(2)O_(3)`
`Mn_(3)O_(4)`

Answer :D
Discussion
3852.

Which one of the following metals is alloyed with sodium to transfer heat in a nuclear reactor ?

Answer»

Potassium
Calcium
Magnesium
Strontium

SOLUTION :Photoelectric cell an ELECTRONS device whose electrical properties are modified by the ACTION of light . Rubidium is the element used in the filament of photoelectric cell that CONVERT light energy into electric energy .
Discussion
3853.

Write the products in the following: CH_(3)-CH_(2)-CH_(2)-overset(CH_(3))overset(|)CH-CHO overset(NaBH_(4))to

Answer»

SOLUTION :`underset("2-methyl pentane -1-ol")(CH_(3)-CH_(2)-CH_(2)-underset(CH_(3))underset(|)CH-CH_(2)-OH)`
Discussion
3854.

Which of the following carbohydrates is a disaccharide?

Answer»

Raffinose
Glucose
maltose
Fructose

Answer :C
Discussion
3855.

Which of the following do not have any tendency to act as ligands during complex formation ?

Answer»

`BiH_3`
`PH_3`
`AsH_3`
`SbH_3`

Solution : LIGANDS forms coordinate covalent bond with central METAL ATOM in the complex
`BiH_3AsH_3, SbH_3`are weak BASES, size of the central atom is large. So they could not donate the lone pair. Hence no ligating tendency .
Discussion
3856.

Two chemical reactions are given below: (2) Give the name of each reaction.

Answer»


ANSWER :BENZALDEHYDE : GATTERMAN - KOCH REACTION
Discussion
3857.

Which one has pH 12

Answer»

0.01 M KOH
1 N KOH ml
1 NaOH ml
1 N `Ca(OH)_(2)ml`

Solution :`[OH^(-)] = 10^(-2)M, POH = 2`
`pH + pOH = 14, pH = 14 - pOH`
`pH = 14 - 2 = 12`.
Discussion
3858.

Which of the following properties of liquids arises(s) due to the molecular and thermal interaction?

Answer»

vapour pressure
Surface tension
VISCOSITY
All of these

Solution :Vapour pressure, viscosity and surface tension of LIQUIDS arises due to the MOLECULAR and themal INTERACTION.
Discussion
3859.

Which of the following polymers contain 1,3-butadiene as one of the monomers?

Answer»

ABS plastic
SBR
Saran
Nitrile rubber

Answer :A::B::D
Discussion
3860.

Which of the following reagents form a precipitate with a solution containing Pb^(2+)ion?

Answer»

DIL HCl
KI solution
AQ `K_2CrO_4` solution
All these .

ANSWER :D
Discussion
3861.

The vapour densities of two gases are in the ratio of 2 : 5 Their molecular masses are in the ratio of -

Answer»

`5 : 2`
`1 : 3`
`2 : 5`
`3 : 1`

ANSWER :C
Discussion
3862.

Which of the following is a tertiary alcohol?

Answer»

`CH_(3)-CH(CH_(3))-CH_(2)OH`
`CH_(3)-CH_(2)-CH_(2)-CH_(2)-OH`
`CH_(3)-CH_(2)-CH(CH_(3))-OH`
`CH_(3)-C(CH_(3))_(2)-OH`

Answer :D
Discussion
3863.

The relative lowering in vapour pressure and mole fraction of a solvent in 1 1.5 molal aqueous solution obeying Raoult's law for non volatile solute and volatile solvent.

Answer»

0.26 BAR, 0.74
2.6 bar, 0.99
0.026 bar, 0.97
0.96 bar, 0.98

ANSWER :C
Discussion
3864.

Write the names and formulae of any five oxyacids of sulphur.

Answer»

Solution :These are
1. SULPHUROUS acid, `H_2SO_3`
2. Sulphuric acid, `H_2SO_4`
3. Thiosulphuric acid, `H_2S_2O_3`
4. Peroxymonosulphuric acid, `H_2SO_3`
5. Dithionic acid, `H_2S_2O_6`
Discussion
3865.

Which of the following gives positive victormeyer test yellow precipitate with NaOH//I_(2)

Answer»




ANSWER :A,C
Discussion
3866.

When you freeze water in your freezer to make ice cubes, the amount of order in the molecules of water increases. However, second law of thermodynamics says that the amount of order in an isolated system can only stay constant or decrease with time. How can this making of ice violates second law

Answer»

Because WATER expands during ice formation
Because ice formation TAKES place at `0^(@)C`
Because ice is solid
Because ice cubes do not constitute isolated system

Answer :D
Discussion
3867.

Which of the following is not correct for a fuel cell?

Answer»

It can strore chemical ENERGY
Reactants are continously spplied to the cell
Products are continuosly removed from the cell
It is a voltaic cell

Solution :A fuel cell is ESSENTIALLY a battery but if differs by operating with a continuous supply of energetic reactants, or fuel. The first fuel cell was INVENTED in `1839` by William Groves. He obtained the cell b y electrolyzing water and collecting the `H_(2)` and `O_(2)` in SMALL, inverted test tubes. After removing the battery current would flow from the cell. In effect, the electrolysis charged the cell, after which it operated as a fuel cell.
In its simplest form, `H_(2)//O_(2)` fuel cell consists of an electrolyte solution, such as sodium or potassium hydroxide solution, and two inert electrodes. `H_(2)` and `O_(2)` gases are bubbled through the ANODE and cathode compartments.
Unlike batteries, fuel cell do not store chemical energy.
Discussion
3868.

When condesation of hexamethylene diamine and adipic acid in a inert atmosphere the product obtained is

Answer»

asolid POLYMER of nylon -66
a semi SOLID polymer of nylon -66
a solid polymer of nylon -6
a semi solid polymer of nylon -6

ANSWER :B
Discussion
3869.

The transition element that has lowest enthalpyof atomisation, is :

Answer»

V
Fe
Zn
Cu

Solution :LESSER NUMBER unpaired `e^(-)`, so less metallic bonding & hence less ENTHALPY of atomisation.
Discussion
3870.

Which substance prepare colloidal sol in water?

Answer»

SALT 
Glucose
Starch
`BA(NO_(3))_(2)`

SOLUTION :Starch
Discussion
3871.

Which of the following names are used for group zero elements

Answer»

Rare GASES of atmosphere
Noble gases
Inert gases
Rare -EARTHS

SOLUTION :a) Rare gases of atmosphereb) Noble gasesc) Inert gases
Discussion
3872.

Write the structural formula of the main product formed when , (i) The compound obtained by hydration of ethyne is treated with dilute alkali. (ii) Methanal reacts with ammonia.

Answer»

Solution :(i) `underset("ETHYNE")(HC-=CH)+H_(2)O overset(Hg^(2+))rarr underset("Ethanal")(CH_(3)CHO) overset(OH^(-))rarr underset("ALDOL")(CH_(3)-underset(OH)underset("|")"CH"-CH_(2))-CH`
(ii) `6CH_(2)O+4NH_(3) rarr (CH_(2))_(6)N_(4)+6H_(2)O`
Discussion
3873.

We know that balancing of a chemical equation is entirely based on law of conservation of mass. However the concept of Principle of Atom Conservation (POAC) can also be related to law of conservation of mass in a chemical reaction.So, POAC can also act as a technique for balancing a chemical equation.For example, for a reaction : ABC_3toAB+C_2 On applying POAC for A,B&C and relating the 3 equation, we get :(.^nABC_3)/2=(.^nAB)/2=(.^n_(c_2))/3 (n_x : number of moles of x) Thus, the coefficients of ABC_3,AB & C_2 in the balanced equation with be 2,2 & 3 respectively and the balanced chemical equation can be represented as : 2ABC_3to2AB+3C_2 Now answer the following questions : If the weight ratio C and O_2 presents 1:2 and both of reactants completely consume and form CO and CO_2 and we will obtain a gasous mixture of CO and CO_2.What would be the weight ratio of CO and CO_2 in mixture.

Answer»

`11:7`
`7:11`
`1:1`
`1:2`

SOLUTION :`{:(C+,O_2to,CO+,CO_2),(w,2w,X" "gm, y" "gm):}`
`POACforC "" POAC for O`
`w/12=x/28+y/44 "" 2xx(2w)/32=x/28+2xxy/44`
`w/3=x/7+y/11 …(i) " " w/4=x/14+y/11..(2)`
So now, `(3y)/11+(3x)/7=(4x)/14+(4y)/11`
`(3x)/7-(2X)/7=y/11`
`x/7=y/11, x/y=7:11`
Discussion
3874.

The van der Waals equation for 1 mole of gas is (p+a/V^(2))(V-b)=RT where,

Answer»

p and V are ideal pressure and ideal volume RESPECTIVELY
(V - b) is the REAL volume
`(p+a/V^(2))` is the ideal pressure
`(p+a/V^(2))` is the real pressure

Answer :C
Discussion
3875.

Which one of the following has the most nucleophilic nitrogen ?

Answer»




Solution :In OPTION (b) lone PAIR of electrons on N is a part of aromaticity and in option (c ) `NH-` group is adjacent to to electron WITHDRAWING group and in option (d) lone pair is a part of RESONANCE. So pyridine is most nucleophilic.
Discussion
3876.

What is the name given to properties like lowering of vapour pressure, depression in freezing point and elevation in boiling point ?

Answer»

SOLUTION :COLLIGATIVE
Discussion
3877.

Which of the following attraction is strongest ?

Answer»




SOLUTION :STRENGTH of MOLECULAR forces :
Ion-DIPOLE `GT` dipole-dipole `gt` ion-induced dipole `gt` dipole-induced dipole `gt` London forces.
Discussion
3878.

Which of the following solution is used as washing solution for eyes to free them from microorganisms?

Answer»

`0.2 %` Phenol SOLUTION
`1%` Phenol solution 
`2-3%` Iodine solution 
DILUTE AQUEOUS solution of BORIC acid 

Solution :Dilute aqueous solution of Boric acid
Discussion
3879.

Write the IUPAC name of the following complex : [Co(NH_(3))_(5)(CO_(3))]CI.

Answer»

Solution :`[Co(NH_(3))_(5)(CO_(3))]Cl`
Pentaamminecarbonatocobalt(IIL)CHLORIDE
Discussion
3880.

Which law of thermodyanamics help in calculatingentropy at different temperatures

Answer»

First LAW
Second law
THIRD law
Zeroth law

Solution :Third law of thermodynamics HELP in calculating entropy of DIFFERENT temperatures.
Discussion
3881.

Which has the highest boiling point?

Answer»

`CH_(3)CH_(3)`
`CH_(3)OH`
`C_(2)H_(5)OH`
`C_(3)H_(8)`

Answer :C
Discussion
3882.

When silver nitrate is treated with dilute solution of hypo, a white precipitate appears which quickly changes colour to black due to the formation of -

Answer»

`Ag_(2)S_(4)O_(5)`
`Ag_(2)$_(2)o_(2)`
`Ag_(2)S`
Ags

Answer :C
Discussion
3883.

Write the IUPAC name of following complexes.k_4[Fe(CN)_6]

Answer»

SOLUTION :POTASSIUM hexacyano FERRATE (II)
Discussion
3884.

Which of the following cell is concentration cell ?

Answer»

`Cu_((S))|Cu_((aq,1M))^(2+)||Cu_((aq,1M))^(2+)|Cu_((S))`
`Zn_((S))|Zn_((aq,0.5M))^(2+)||Cu_((aq,0.1M))^(2+)|Cu_((S))`
`Cu_((S))|Cu_((aq,0.5M))^(2+)||Cu_((aq,0.5M))^(2+)||Cu_((S))`
`""^(Theta)PT|H_(2_((g,1" bar")))|HCl_((aq,0.002M))||HCl_((aq,0.005M))|H_(2_((g,1" bar")))|Pt^(o+)`

Solution :`""^(Theta)Pt|H_(2_((g,1" bar")))|HCl_((aq,0.002M))||HCl_((aq,0.005M))|H_(2_((g,1" bar")))|Pt^(o+)`
Discussion
3885.

Which of the following polysaccharide is found in the liver and muscles of animals ?

Answer»

CELLULOSE
GLYCOGEN
Starch
heparin

Solution :glycogen
Discussion
3886.

Write the order thermal stability of the hydrides of group-16 elements

Answer»


SOLUTION :Thermal STABILITY of hydrides. decreases, down the group. i.e.,`H_2OgtH_2SgtH_2SegtH_2TegtH_2PO`
Discussion
3887.

The two isomers X and Y with the formula Cr(H_(2)O)_(5)CIBr_(2) were taken for experimenton depression in freezingpoint. It was foundthat onemoleof X gavedepression correspondingto2 molesof particlesand one moleof Ygavedepression due to 3molesof particels . The structural formulae of x and Yrespectively are

Answer»

` [CR(H_(2)O)_(5)CI]Br_(2) , [Cr(H_(2)O)_(4)Br_(2)] CI.H_(2)O`
`[Cr(H_(2)O)_(5)CI]Br_(2),[Cr(H_(2)O)_(3)CIBr_(2)].2H_(2)O`
`[Cr(H_(2)O)_(5)Br]BrCI , [Cr(H_(2)O)_(4)CIBr] Br.H_(2)O`
`[Cr(H_(2)O)_(4)Br_(2)]CI.H_(2)O , [Cr(H_(2)O)_(5)CI]Br_(2)`

Answer :D
Discussion
3888.

Which of the following statement is/are incorrect in relation to the halogenation of alkane ?

Answer»

The reactivity of chlorine is LESS than bromine TOWARDS alkanes .
For photochemical chlorination of methane , `overset(*)(C)l` is formed in slowest STEP.
Free radicals are pyramidal intermediate , stabilised by hyperconjugation and resonance .
Bromine has MUCH higher regioselectivity than chlorine in abstracting `3^@` hydrogen.

Answer :A::B::C
Discussion
3889.

Which of the following expressing is correct

Answer»

`DeltaG^(@)=-nFE_(cell)^(@)`
`DeltaG^(@)=+nFE_(cell)^(@)`
`DeltaG^(@)=-2.303RTnFE_(cell)^(@)`
`DeltaG^(@)=-NF" log "K_(C)`

SOLUTION :`DeltaG^(@)=-2.303RTlogK_(EQ)` or `DeltaG^(o)=-nFE_(cell)^(o)`
Discussion
3890.

Which of the following compounds gives an addition product with acetone but not with aldehydes?

Answer»

HYDROGEN cyanide
Chloroform
SODIUM bisulphate
Hydrogen

ANSWER :B
Discussion
3891.

What inspired N. Barlett for carrying out reaction between Xe and PtF_(6) ?

Answer»

Solution :Almost same IONIZATION ENTHALPY of oxygen and Xe.
Discussion
3892.

Which is the most reactive alkylhalide for the following reaction ? RX +H_2OrarrR-OH+HX-

Answer»




ANSWER :C
Discussion
3893.

Which can absorb over 99% of its own mass of water and does not stick to wound:

Answer»

RAYON
Guncotton
Thiokol
Saran

Answer :A
Discussion
3894.

Which of the following compound is expected to be colourless

Answer»

`ScO`
`V_(2)O_(3)`
`CuCN`
`Cr_(2)(SO_(4))_(3)`

Solution :`CuCN,`

as all the electrons ae PAIRED. It is EXPECTED to be COLOURLESS.
Discussion
3895.

What are the physical state, colour and shape of BrF_5 ?

Answer»

Liquid, COLOURLESS, SQUARE pyramidal
Liquid, yellow GREEN, BENT T- shaped
Gas, colourless, square pyramidal
Gas, colourless, bent T - shaped

Answer :A
Discussion
3896.

What is common in HCP and FCC unit cell ?

Answer»

octahedral VOIDS are completely inside the unit cell
TETRAHEDRAL voids are completely inside the unit cell
NUMBER of layers constituting the unit cell are same
NONE of these

Answer :D
Discussion
3897.

Which compound is the most acidic of the following ?

Answer»

`C_6H_5COOH`
`ClCH_2COOH`
`CD_3COOH`
`CH_3CH_2COOH`

ANSWER :B
Discussion
3898.

Which one among the following is not diastereomric pair.

Answer»

I and III
I and II
II and III
I and IV

Answer :A
Discussion
3899.

Write thenames and structures of the compoundsformed during Friedel-Crafts reaction of benzene with C""Cl_4

Answer»

SOLUTION :
Discussion
3900.

Which among the following statements are correct?

Answer»

`underset(* *)OVERSET(* *)CF_(2)` is more stable than `overset(* *)C Cl_(2)`
`overset(* *)C Cl_(2)` is more stable than `overset(* *)CBr_(2)`
Singlet `overset(* *)CH_(2)` is more stable than TRIPLET `overset(* *)CH_(2)`
Singlet `overset(* *)CH_(2)` has planar geometry

Solution :`:CF_(2)GT:C Cl_(2)gt:CBr_(2)gt:Cl_(2)rarr` Stability
Discussion