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2601.

What is galvanic cell ? Give half cell reaction of Daniell cell and explain redox couple.

Answer»

Solution :(a) Galvanic cell: It is an electrochemical cell that converts the CHEMICAL ENERGY of a SPONTANEOUS redox reaction into electrical energy.
(b) Chemical reaction occurs in Daniell cell:
(i) `Cu_((aq))^(2+)+2e^(-)toCu_((s))` (reduction half reaction)
(ii) `Zn_((s))toZn_((aq))^(2+)+2e^(-)` (oxidation half reaction)
(iii) `Zn_((s))toCu_((aq))^(2+) to Zn_((aq))^(2+)+Cu_((s))` (redox reaction)
This reaction is the combination of two half reactions whose addition gives the overall cell raction.
These reactions occur in two different portions of the Daniell cell.
The reduction half reaction occurs on the copper electrode while the oxidation half reaction occurs on the zinc electrode.
These two portions of the cell are ALSO called half-cells or redox couples.
The copperelectrode may be called the reduction half-cell and the zinc electrode the oxidation half-cell.
Discussion
2602.

Three different samples of radioactive substances each containing equal moles of given substance are taken then :

Answer»

activity of `U_(3)O_(8)` will be miximum
SPECIFIC activity of `U_(3)O_(8)` will be maximum
on increasing temperature, activity of all three samples will increase
`7alpha-` particles will be EMITTED when `U^(235)` decay to STABLE nuclei

Answer :A::D
Discussion
2603.

Write the structures of the major organic product in each of the following: CH_3CH_2Br + NaI rarr.

Answer»

SOLUTION :`CH_3CH_2I + NABR`
Discussion
2604.

Which element in 3d series does not exhibit variable oxidation states?

Answer»

Zn
SC
Fe
Ni

Solution :Sc SHOWS only (+3) STATE
Discussion
2605.

Which of the following alcohol will show positive iodoform test ?

Answer»

`CH_3-oversetoverset(OH)(|)CH-CH_2-NO_2`
`CH_3-oversetoverset(OH)(|)CH-CH_2-COOH`
`ICH_2-oversetoverset(OH)(|)CH-CH_2-CH_3`
NONE of these

Solution :
Discussion
2606.

Which of the following pairs of ions are colourless?

Answer»

`TI^(2+),Cu^(+2)`
`Sc^(+3) ,Zn^(+2)`
`Co^(+2),Fe^(+3)`
`NI^(+2),V^(+3)`

ANSWER :B
Discussion
2607.

What weight of water will be decomposed by a current of 100 amp in 12 h ?

Answer»


ANSWER :403 G
Discussion
2608.

Which of the following vitamins is synthesised by sun rays ?

Answer»

A
D
C
D.

Answer :B
Discussion
2609.

Total number of geometrical isomers of [CoBrClI(CN)(H_(2)O)(NH_(3))]^(-) complex ion, in which all halides are in cis-position.

Answer»


SOLUTION :
Discussion
2610.

Which is a non-aromatic compound

Answer»




SOLUTION :For a COMPOUND to be aromatic, it should have `(4n+2)PI` electrons i.e, 6,10,14 , `pi` electrons. But cyclooctatetraene has `8pi` electrons and so, is non-aromatic
Discussion
2611.

What are coinage metals ? Why are they so called ?

Answer»

Solution :Copper, SILVER and GOLD are calledcoinage metals because in the early times,they were usedin making coins.
Discussion
2612.

Which of the following pair of molecules will have permanent dipole moment?

Answer»

`NO_(2) and CO_(2)`
`NO_(2) and O_(3)`
`SiF_(4) and CO_(2)`
`SiF_(4) and NO_(4)`

ANSWER :B
Discussion
2613.

What is meant by the term broad spectrum antibiotics ? Explain.

Answer»

Solution : Broad spectrum antibiotics are effective against SEVERAL DIFFERENT types of harmful bacteria. For example, tetracycline, chloramphenicol, ofloxacin, ETC. Broad spectrum antibiotics CURE many diseases. For crumple, chloramphenicol can be used in case of typhoid, dysentery, acute fever, URINARY infections. meningitis and pneumonia
Discussion
2614.

Which element is the bestnon-metal?

Answer»

SOLUTION :FLUORINE
Discussion
2615.

Which of the following good oxidising agent ?

Answer»

`EU^(2+)`
`Ce^(4+)`
`Yb^(2+)`
`Sm^(2+)`

Answer :B
Discussion
2616.

Which of te following reaction gives correct major product-

Answer»




SOLUTION :
Discussion
2617.

What is the role of diffusion in heterogenous catalysis ?

Answer»

SOLUTION :Firstly, the geseous reactant molecules diffuse TOWARDS the SURFACE of the SOLID catalyst. Here, they get adsorbed which then REACT to form proudects which are adsorbed on the surface. Now diffusion away of the product molecules from the surface is required so that the surface is again free for adsorption of more reactant molecules and the phenomean is repeated over and again.
Discussion
2618.

When FeCl_3 solution is added to NaOH a negatively charged sol is obtained. It is due to the

Answer»

Presence of basic group
Preferential adsorption of `OH^–` ions
Self dissociation
Electron capture by sol particles

Solution :`FeCl_2+3NaOH to Fe(OH)_3+3NaCl`
`NAOH to Na^(+) +OH^(-)`
`OH^(–)` ions having SIMILARITY with `Fe(OH)_3` will be adsorbed on the SURFACE of `Fe(OH)_3` to FORM an electrical double layer
`Fe(OH)_3 |:(OH^(-)),(OH^(-)),(OH^(-)):||:(Na^(+)),(Na^(+)),(Na^(+)):|`
Discussion
2619.

Which of the following pairs of cations can be separated by passing H_(2)S through the mixture in the presence of 0.2 M HCl?

Answer»

`Pb^(2+), CU^(2+)`
`Ag^(+), Cu^(2+)`
`CD^(2+), Bi^(3+)`
`Cu^(2+), Zn^(2+)`

ANSWER :D
Discussion
2620.

What is believed to be the second most common element in the universe

Answer»

Helium
Hydrogen
Nitrogen
Silicon

Answer :D
Discussion
2621.

Which one of the followingstatements related to lanthanonsis incorrect ?

Answer»

EUROPIUM SHOWS + 2 OXIDATION state.
The basicitydecreasesas the ionicradiusdecrease from Pr to Lu.
All thelanthanonsare muchmorereactive than aluminium.
`CE^(4+)`solutionswidelyusedas oxidisingagentsin volumetric analysis .

SOLUTION : All the lanthanons are muchmorereactive than aluminium .
Discussion
2622.

Which of the following has the highest bond order ?

Answer»

`N_(2)`
`O_(2)`
`He_(2)`
`H_(2)`

Solution :Molecular orbital configuration of
`N_(2)RARR sigma 1S^(2)sigma^(**)1s^(2)sigma 2s^(2)sigma^(**)2s^(2)PI 2p_(x)^(2)pi 2p_(y)^(2)sigma 2p_(z)^(2)`.
BOND ORDER `=(1)/(2)(10-4)=3`
`O_(2)rArr sigma 1s^(2)sigma^(**)1s^(2)sigma2s^(2)sigma^(**)2s^(2)sigma 2p_(z)^(2)pi 2p_(x)^(2)pi2p_(y)^(2) pi^(**)2p_(x)^(1)pi^(**)2p_(y)^(1)`
Bond order `=(1)/(2)(10-6)=2`
`He_(2)rArr sigma 1s^(2)sigma^(**)1s^(2)`, Bond order `=(1)/(2)(2-2)=0`
`H_(2)rArr sigma 1s^(2)` , Bond order `=(1)/(2)(2-0)=1`
Discussion
2623.

Whichone of thefollowingis a monossacharide ?

Answer»

GLUCOSE
MALTOSE
SURCOSE
CELLULOSE

ANSWER :A
Discussion
2624.

Write one difference in the following : Coagulation and peptisation

Answer»

SOLUTION :COAGULATION and peptisation : The process of settling of colloidal PARTICLES is called coagulation. Peptisation is the process of CONVERSION of precipitate into colloidal SOL.
Discussion
2625.

To distinguish between acetone and iso-propyl alcohol, which of the following reagent can help

Answer»

`NaCl `
` NaOH`
` Na_(2) CO_(3)`
`NaHSO_(3)`

ANSWER :D
Discussion
2626.

Which of the following has highest dipole moment? (i) CH_(3)Cl_(2) (ii) CHCl_(3) (iii) C Cl_(4)

Answer»

Solution :The three dimensional structures of the trhee compounds along with the direction of DIPOL MOMENT in each of their bonds are GIVEN below:

`C Cl_(4)` being symmetrical has zero dipole moment. In `CHCl_(3)`, the resultant of two C-Cl dipoles is opposed by the resultant of C-H and C-Cl bonds. since the latter resultant is expected to be smaller than the former, THEREFORE, `CHCl_(3)` has a FINITE dipole (1.03D) moment.
In `CH_(2)Cl_(2)`, the resultant of two C-Cl dipolemoments is reinforced by resultant of two C-H dipoles, therefore, `CH_(3)Cl_(2)(1.62D)` has a dipole moment higher than that of `CHCl_(3)`. thus, `CH_(2)Cl_(2)` has the highest dipole moment.
Discussion
2627.

Which of the following drugs is an analgesic

Answer»

Iodex
Paludrin
ANALGIN
Sulphaguanidine

Solution :An analgesic drugs is ONE which relieves or decrease the pain e.g., analgin, ASPIRIN (belongs to non-NARCOTICS) andmorphine, CODEIN, heroin (belongs to narcotics class).
Discussion
2628.

Which statement is true for solution of 0.20 M H_(2)SO_(4)

Answer»

2 litre of the solution contains 0.020 mole of `SO_(4)^(2-)`
2 litre of the solution contains 0.080 mole of `H_(3)O^(+)`
1 litre of the solution contains 0.020 mole `H_(3)O^(+)`
NONE of these

Solution :`[H_(3)O^(+)]=2xx0.02=0.04 M`
`therefore` 2 litre solution contains 0.08 mole of `H_(3)O^(+)`.
Discussion
2629.

Typical electronic energy gaps in molecules are about 1.0 eV. In terms of temperature, the gap is closed to -

Answer»

`10^(2)K`
`10^(4)K`
`10^(3)K`
`10^(5)K`

Solution :`(3)/(2)KT=1.6xx10^(-19)`
`(3)/(2)xx1.38xx10^(-23)=1.6xx10^(-19)`
` T=10^(5)K`
Discussion
2630.

Two reactants ina flask produce bubbles gas , it turns lime water into milky . The reactants in the flask are

Answer»

Zinc and hydrochloric acid
Magnesium carbonate and hydrochloric acid
Magnesium nitrate and hydrochloric acid
Magnesium sulphate and hydrochloric acid .

Solution :The reactant in the flash are magnesium carbonate and hydrochloric acid the REACTIONS are
`MgCO_(3)(s) + 2HCl (AQ) to MgCl_(2) (aq) + CO_(2)(g) + H_(2)O(l)`
Discussion
2631.

Which metal in the 3d series exhibits +1 oxidation state most frequently and why?

Answer»

Solution :(i) The first transition metal COPPER exhibits only +1 oxidation state.
(ii) It is unique in 3d series having a stable +1 oxidation state. Cu (Z =29) ELECTRONIC configuration is `[Ar] 3d^(10)4s^(1)`
(III) So copper element only can have +1 oxidation state
Discussion
2632.

Write Raoult's law for non - volatile solute and volatile solvent and explain it.

Answer»

Solution :The vapour pressure of a solvent in solution is less than that of the pure solvent because the lowering of vapour PRESURE depends only on the concentration of the solute particles.
A relation between vapour pressure of the solution, mole fraction and vapour pressure of the solvent, i.e., `p_(1)=x_(1).p_(1)^(0)`
The REDUCTION in the vapour pressure of solvent `(Delta p_(1))` is given as : `p_(1)=x_(1).p_(1)^(0)`
It should be decrease in vapour presure =
`p_(1)^(0)-p_(1)=p_(1)^(0)-p_(1)^(0)x_(1)`
`1-x_(1)=x_(2)`
`Delta p_(1)=x_(2).p_(1)^(0)`
In a solution containing several non - volatile solutes, the lowering of the vapour pressure depends on the sum of the mole fraction of different solutes.
`(Delta p_(1))/(p_(1)^(0))=(p_(1)^(0)-p_(1))/(p_(1)^(0))=x_(2)`
So, relative lowering of vapour presure `((p_(1)^(0)-p_(1))/(p_(1)^(0)))` is equal to the mole fraction `(X_(2))` of the solute.
`(p_(1)^(0)-p_(1))/(p_(1)^(0))=(n_(2))/(n_(1)+n_(2))`
where, `n_(1)=` moles of solvent and
`n_(2)=` moles of solute
For dilute solutions `n2 lt lt n1`, hence neglecting n2 in the denominator we have,
`(p_(1)^(0)p_(1))/(p_(1)^(0))=(n_(2))/(n_(1))`
`(p_(1)^(0)-p_(1))/(p_(1)^(0))=(w_(2)xx M_(1))/(M_(2)xx w_(1))`
where, `w_(1)=` WEIGHT of solvent
`w_(2)=` weight of solute
`M_(1)=`MOLAR weight of solvent
`M_(2)=` molar weight of solute.
Discussion
2633.

The solution of a chemical compound reacts with AgNO_(3) solution to from a white precipitate of Y which dissolves in NH_(4)OH to give a complex Z. When Z is treated with dilute HNO_(3), Y reappears. The chemical compound X can be:

Answer»

NACL
`CH_(3)CL`
NaBr
NaI

Answer :A
Discussion
2634.

Why boron compounds are covalent in nature?

Answer»

Solution :Many of boron compounds are electron deficient and has unsual type of covalent bonding, which is due to its SMALL size, high ionisation energy and similarity in electronegativity with CARBON and HYDROGEN.
Discussion
2635.

Which of the following is used for the conversion of 1-methylcyclopentene to

Answer»

`BD_(3)` THF FOLLOWED by `CH_(3)COOH`
`BH_(3)` THF followed by `CH_(3)COOD`
`BH_(3)` THF followed by `CH_(3)COOH`
`BD_(3)` THF followed by `CH_(3)COOD`

Answer :B
Discussion
2636.

Write down theIUPAC names and structures of all the possible isomers having the molecular formula C_(2)H_(4)CI_(2) . How are these prepared and distinguished ?

Answer»

Solution :`C_(2)H_(4)CI_(2)-` TWO structural ISOMERS `CH_(3)CHCI_(2)` (1,1-dichloroethane) and `CH_(2)CICH_(2)CI` (1,2-dichloroethane) .
Discussion
2637.

which of the following is not correctly matched?{:("Dispersed phase","Dispersion medium","Example",),((A)"Gas","Solid","Foam rubber",),((B)"Solid","Solid","Ruby glass",),((C)"Liquid","Gas","Fog",),((D)"Liquid","Solid","Paint",):}

Answer»


ANSWER :C
Discussion
2638.

What is electrolysis ? Discuss electrolysis of molten electrolyte.

Answer»

Solution :The process of CHEMICAL DECOMPOSITION of an electrolyte (present in the molten or dissolved state) by passing an ELECTRIC current is called electrolysis.
Electrolysis of molten NaCl
`2NaCl_((l))OVERSET("Heat")hArr2Na^(+)+2Cl^(-)`
At CATHODE
`2Na^(+)+2eto2Na`
At anode
`2Cl^(-)-2eto2Cl`
`2Cl""toCl_(2)`
Sodium is prodụced at cathode and chlorine is produced at anode.
Discussion
2639.

Which vitamin increases the blood clotting time ?

Answer»

VITAMIN `B_(12)`
Vitamin E
Vitamin K
Vitamin D

SOLUTION :Vitamin K
Discussion
2640.

Which of the following gives difference between aldehyde and ketone ?

Answer»

Fehling SOLUTION
TOLLEN's reagent
Schiff's reagent
all of the above

ANSWER :D
Discussion
2641.

What islanthanidecontractionand what arethe effectsof lanthanidecontraction ?

Answer»

SOLUTION :Aswe moveacross4fseriesthe atomicandionicradiiof LANTHANOIDS showgradualdecrease WITHINCREASE in ATOMICNUMBER. Thisdecrease in ionicsize is calledlanthanoidcontraction.
Discussion
2642.

Wrong statement about BuNa N is

Answer»

It is copolymer
N' stands for propenenitrile
its STRUCTURE is ` (-CH_2-CH=CH-CH=CH-underset(CN)underset|CH-)_n `
it is an ADDITION POLYMER

Answer :C
Discussion
2643.

Which of the following products are formed when potassium bromide reacts with (Y) in alkaline pH ?

Answer»

`BrO_3^(-),MnO_2`
`BrO_4^(-), MN^(2+)`
`Br_2, MnO_2`
`BRO^(-), MnO_4^(2-)`

SOLUTION :`2KMnO_4(Y)+KBr+H_2OtoKBrO_3+2KOH+2MnO_2.0`
Discussion
2644.

The standard reduction potential for Fe^(2+)//Fe and Sn^(2+)//Sn electrodes are -0.44 and -0.14V respectively. For the givenn cell reaction, Fe^(2+)+Sn to Fe+SN^(2+), the standard EMF is

Answer»

0.42 V
`-0.42V`
`-0.30V`
`-1.10V`

ANSWER :C
Discussion
2645.

Which of the folliwning ether wil always give SN^(2) mechanism in acidic as well as basic conditions?

Answer»




All

Solution :All
Discussion
2646.

Which is obtained when SO_2 is bubbled through a solution of CuCl_2 ?

Answer»

`CU`
`Cu_2Cl_2`
`CuSO_4`
`CUS`

ANSWER :B
Discussion
2647.

0.90 gm of an organic compound C_(4)H_(10)O_(2) (A)when treated with sodium gives 224 ml of hydrogen at NTP. Compound (A) can be separated into fraction (B) and (C ), by crystallisation of which the fraction (B) is resolved into isomers (D) and (E ). Write down the structural formula of (A) to (E ) with proper reasoning.

Answer»

SOLUTION :`[(CH_(3),CH_(3),CH_(3),),("|","|","|",),(H-C-OH,H-C-OH,OH-C-H,),("|","|","|",),(H-C-OH,OH-C-H,H-C-OH,),("|","|","|",),(CH_(3),CH_(3),CH_(3),),((C ),(D),(E),)]`
Discussion
2648.

Which of the following set has all the ions coloured ?

Answer»

`Cu^(2+),Fe^(2+), Co^(2+)`
`Cu^(2+), Sc^(3+), Mg^(2+)`
`Al^(3+), Zn^(2+), Co^(2+)`
`Fe^(3+), Sc^(3+), NI^(2+)`

ANSWER :A
Discussion
2649.

Which of the following does not form a pentachloride ?

Answer»

P
As
Sb
N

Solution :N does not have d-orbitals in the VALENCE SHELL.
Discussion
2650.

Which of the following is a 'p-' block element in the periodic table ?

Answer»

Na
O
Mg
FE

ANSWER :B
Discussion