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701.

What will be the product formed when sodium acetate is treated with sodalime?

Answer»

`C_2H_6`
`CH_4`
`CH_3COOH`
`(CH_3CO)_2O`

SOLUTION :`CH_4`
Discussion
702.

Which of the bond length order data is INCORRECT

Answer»

P-Cl GT P-F in `PCl_(3)F_(2)`
`S-F_("(AXIAL)")gt S-F_("(aq)") ` in `SF_(6)`
`S-F_("(axial)") gt S-F_("(aq)") ` in `SF_(4)`
`NO_(2)^(-) lt NO_(3)^(-)` (N-O)

Answer :A
Discussion
703.

Which of the following series correctly represents relations between the elements from X to Y ? X to Y

Answer»

`._(3)Li to _(19)K` Ionization enthalpy increases
`._(9)F to _(35)Br` Electron GAIN enthalpy (negative SIGN) increases
`._(6)C to _(32)Ge` Atomic RADII increases
`._(18)AR to _(54)Xe` Noble character increases

Solution :On moving down a group atomic radii increases.
Discussion
704.

Write the IUPAC name of the complex [Cr(NH_3)_4 Cl_2]^(+). What type of isomerism does it exhibit?

Answer»

SOLUTION :(i) Tetraammine dichlorido CHROMIUM (III) ION.
(ii) Geometrical isomerism/ cis-trans.
Discussion
705.

What is thestrcuture of interhalogencompound ofthe type XX_(3) ?

Answer»

Solution :(1) Interhalogen compound of thetype `XX_(3)`possesses trigonalbipyramidal or T-shaped strucure.
(2) Thecentral halgen atomX (X = cl, Br, I) undergoes `sp^(3)` d hydridisation FORMING fivehyridorbitals .
(3) Two hydrid orbitalscontains lone pairsof electrons.
Ground state of X
CONSIDER `CIF_(3)` MOLCULES :

ThebondangleF-Cl - F is `87^(@)29` close to `90^(@)`due to repulsionbetweenlonepairs - lonepairs and lonepairsbondspairs.
Discussion
706.

Which of the following graph correctly represents the variation of molar conductance (Delta_m) with dilution for a strong electrolyte ?

Answer»




ANSWER :B
Discussion
707.

Which of the following complex will show optical activity?

Answer»

(a) `trans-[CO(NH_3)_4Cl_2]^(+)`
(b) `[Cr(H_2O)]^(3+)`
(c) `cis-[Co(NH_3)_2(EN)_2]^(3+)`
(d) `trans-[Co(NH_3)_2(en)_2]^(3+)`

Solution :(a) trans-`[Co(NH_3)_4Cl_2]^(+)` has plane of symmetry as well as CENTRE of symmetry. Hence it does not show OPTICAL isomerism.
(b) `[Cr(H_2O)_6]^(3+)` has plane of symmetry as well as centre of symmetry. Hence it does not show optical isomerism. ltbr. (c) cis-`[Co(NH_3)_2(en)_2]^(3+)` LACKS one of the symmetry elements.

(d) trans-`[Co(NH_3)_2(en)_2]^(3+)` has plane of symmetry as well as centre of symmetry. Hence it does not show optical isomerism.
Discussion
708.

Which of the following will give cyclic products upon being heated or being treated by an acid ?

Answer»




ANSWER :A::B::C
Discussion
709.

Two mole of an ester (A) are condensed in presence of sodium ethoxide to give a beta-keto ester (B) and ethanol. On heating in an acidic solution (B) gives ethanol and beta-keto acid (C). On decarboxylation (C) give 3-pentanone. Identify (A),(B) and (C).

Answer»


Answer :(A) `CH_(3)CH_(2)COOC_(2)H_(5)` (ETHYL propanoate)
(B) `CH_(3)CH_(2)Counderset(CH_(3))CHCOOC_(2)H_(5)` Ethyl- (2-methyl-3-ketopentanoate)
(C) `CH_(3)CH_(2)Counderset(CH_(3))CHCOOC_(2)H_(5)` (2-methyl-3-ketopentanoate)
Discussion
710.

Which is formed when ethanol reacts with acetic acid

Answer»

`CH_3COOC_2H_5`
`C_2H_5OC_2H_5`
`CH_3OCH_3`
`CH_3CH_2CHO`

ANSWER :A
Discussion
711.

When chlorine gas is passed through an aqueous solution of a potassium halide in the presence of chloroform, a violet colouration is obtained. On passing more of chlorine water, the violet colour disappears and solution becomes colouless. This thet confirms the presence of ......... in aqueous solution.

Answer»

chlorine
fluorine
bromine
iodine

Answer :D
Discussion
712.

Write the IUPAC names of the following compounds [CO(NH_3)_6]Cl_3

Answer»

SOLUTION :HEXAAMMINECOBALT(III) CHLORIDE
Discussion
713.

The value of rate constant for a first order reaction 2.303 xx 10^(-2) sec^(-1) .what will be time required to reduce the concentration to (1)/(10) th its initial concentration

Answer»

10 second
100 second
2303 second
230.3 second

SOLUTION :`t = (2.303)/(K)` LOG `([A_(0)])/([A])`
`t = (2.303)/(2.303 xx 10^(-2)) "log" (100)/(10) IMPLIES t = 10^(2)` log 10 `implies t = 100` sec
Discussion
714.

Which of the following is sec - butyl pheyl vinyl methane-

Answer»


SOLUTION :
Discussion
715.

Which amongst the following has zero magnetic moment ?

Answer»

`K[Cr(H_(2)O)_(2)(C_(2)O_(4))_(2)].3H_(2)O`
`CrCl_(3)(PY)_(3)`
`K_(4)[Mn(CN)_(6)]`
`[Co(NH_(3))_(5)CL]CL_(2)`

Solution :`[K^(+1)[Cr^(+3)(H_(2)O)_(2)(C_(2)O_(4))_(2)^(-4)].3H_(2)O`
`{:((Cr^(+3)(py)_(3)Cl_(3)]," "d^(3)),(K_(4)^(+4)[Mn^(+2)(CN)_(6)^(-6)]," "d^(5)),([Co^(+3)(NH_(3))_(5)Cl]Cl_(2)," "d^(6)):}`
Discussion
716.

Which one of the following formulae does not represent a salt derived from phosphorus acid, H_3PO_3 ?

Answer»

`NaH_2PO_3`
`Na_2HPO_3`
`Na_3PO_3`
NONE of these

Answer :C
Discussion
717.

What happens when napthalene balls are put inside kerosene

Answer»

PRECIPITATES
Dissolves upon heating
Dissolves EASILY
Does not dissolve

Answer :C
Discussion
718.

Which one of the following is the anhydride of HCIO?

Answer»

`Cl_(2)O_(7)`
`Cl_(2)O_(3)`
`ClO_(2)`
`Cl_(2)O_(7)`

ANSWER :D
Discussion
719.

Write the formula for the following : Tetraammineaquachloridocobalt(III) nitrate

Answer»

Solution :Tetraamineaquachloridocobalt(III) NITRATE
`[CO(NH_(3))_(4)(H_(2)O)Cl](NO_(3))_(2)`
Discussion
720.

Which of the following types of metals form the most efficient catalysts?

Answer»

alkali metals
alkaline EARTH metals
TRANSITION metals
all of these

Solution :MANY of the d-block (transition) elements and their compounds act as catalyst. Catalytic property is probably due to the utilisation of (n-1)d orbitals or formation of INTERSTITIAL compounds.
Discussion
721.

Which of the following liberates methane gas on treatment with water ?

Answer»

SILICON CARBIDE
calcium carbide
aluminium carbide
IRON carbide

Answer :C
Discussion
722.

What happens when?(a) Sulphur is boiled with caustic soda. (b) Sulphuric acid is treated with PCl_(5) (c) Sulphur dioxide gas, water vapour and air are passed over heated sodium chloride.

Answer»

Solution : (a) `4S +6NaOHtoNa_(2)S_(2)O_(3)+2Na_(2)S+3H_(2)Ooverset( Excesssattur)toNa_(2)S_(5)`
(b) `H_(2)SO_(4)+2PCI_(5)toSO_(2)Cl_(2)+2POCI_(3)+2HCI`
(c) `2SO_(2)+O_(2)+ 2H_(2)O2NaCI+H_(2)SO_(4)toNa_(2)SO_(4)+2HCI`
Discussion
723.

What are intrinsic semiconductors ? Give an example.

Answer»

Solution :Intrinsic semiconductor ALSO called as undoped semiconductors or p-type semiconductor, the number of charge CARRIERS is therefore determined by the properties of the material itself instead of the amount of impurities. In intrinsic semiconductors the number of LOCATED electrons and the number of holes are equal n = p.
The most common EXAMPLES of the intrinsic semiconductors are silicon and germanium. Both of these are used frequently in manufacturing of Transistors and electronic PRODUCTS.
Discussion
724.

Which of the following ions can be separated by using H_(2)S in the presence of dil. HCl ?

Answer»

`CU^(2+),CO^(2+)`
`Hg_(2)^(2+), Cu^(2+)`
`PB^(2+),Ni^(2+)`
`Cu^(2+),BI^(2+)`

Answer :A::C
Discussion
725.

Which of the following polymer has a monomer unit named prop-2-ene nitrile.

Answer»

ORLON
SARAN
DACRON
Tertron

ANSWER :A
Discussion
726.

Which out of C Cl_4 and SiCl_4 reacts with water and why?

Answer»

SOLUTION :`SiCl_4`, because there is VACANT d - orbitals in the VALENCE SHELL of silicon,
Discussion
727.

What is chemical name of vitamin B_(12) ?

Answer»

PYRIDOXINE
CYANOCOBALAMINE
Riboflavin
Thiamin

SOLUTION :Cyanocobalamine
Discussion
728.

Which of the following is the strongest Bronsted acid ?

Answer»




SOLUTION :
Discussion
729.

Which of the following structure represent Neoprene ?

Answer»

`[--CH_(2)-overset(CL)overset(||)C-CH--]_(n)`
`[--underset(C_(6)H_(5))underset("||")"CH"-CH_(2)--]_(n)`
`[CH_(2)-underset(Cl)underset(||)C=CH-CH_(2)--]_(n)`
`[--CH_(2)-overset(CN)overset("||")"CH"--]_(n)`

ANSWER :C
Discussion
730.

Which halide is least reactive:

Answer»

ALKYL halide
Allyl halide
Vinyl chloride
None

Answer :C
Discussion
731.

What are interstitial compounds ? Why are such compounds well known for transition metals?

Answer»

SOLUTION :Transition metals form interstitial compounds. Transition metals have a unique character to form interstitial compounds with small non-metallic elements such as hydrogen, boron, carbon and nitrogen. The small ATOMS of these non-metallic elements (H, B, C, N, etc.) fit into the vacant spaces of the lattices of the transition metal atoms. As a result of the filling up of the interstitial spaces, the transition metals become rigid and hard. These interstitial compounds have simialr chemical properties as the parent metals but have different physical properties, particularly, density, hardness and CONDUCTIVITY. For example, steel and cast iron are hard because of the formation of interstitial compounds with carbon.
These interstitial compounds have variable COMPOSITION and cannot be expressed by a simple formula. Therefore, these are called non-stoichiometric compounds.
Discussion
732.

Which of the following pairs is not distinguished by passing H_(2)S ?

Answer»

`Hg^(2+),Pb^(2+)`
`Cd^(2+),Pb^(2+)`
`SB^(2+),Cd^(2+)`
`ZN^(2+),Mn^(2+)`

ANSWER :1
Discussion
733.

Which of the following can be concluded from AN the primary structure of proteins ?

Answer»

Proteins are made of only D-AMINO acids.
A small change in the sequence of amino E acids may change the physical and chemical properties of amino acids.
The amino acids in peptide CHAIN have the definite sequence. The REPEATING sequences within the protein molecule are common.
A protein may contain more than ONE amino acid chains that are linked by S-S LINKAGES.

Solution :A protein may contain more than one amino acid chains that are linked by S-S linkages.
Discussion
734.

Which among the following is the incorrect statement regarding the acidic nature of nitroalkanes?

Answer»

`1^(@) " and "2^(@)` nitroalkanes SHOW ACIDIC character
nitroalkane dissolve in NaOH to GIVE salt
aci form is more acidic than intro form
acidity DECREASES DUE to the - I effect of alkayl groups

Answer :D
Discussion
735.

Write the Nernst equation for the half cell Zn_((aq))^(2+)//Zn_((s)).

Answer»

Solution :`E_(ZN^(2+)//ZM)=E_(Zn^(2+)//Zn)^(@)-(RT)/(2F)ln [Zn^(2+)]`
Discussion
736.

Two volatile liquide A and B are mixed in mole ratio 1:3, to form an ideal liquid solution Vapour pressure of pure. A and B are 600 torr and 200 torr. Volume of container for vapour is 76 litre. (R= 1//12" " "litre" " "atm//K//"mole") The minimum number of distillation steps required, so that mole fraction of A become 0.9 in distillate.

Answer»

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

SOLUTION :`Y_(A_(1)) = 0.5 = X _(A_(2))`
`Y_(A_(2)) = 0.5 xx 600 + 0.6 xx 200 = 400` torr
`Y_(A_(2)) = (0.5xx600)/(400)= (3)/(4) = X_(A_(2))`
` Y_(A_(3)) = (3)/(4) xx 600 +(1)/(4) xx 200 = 500` torr
` Y_(A_(3))xx 500 = (3)/(4) xx 600 `
`Y_(A_(3)) xx (9)/(10) = X_(A_(4))`
Discussion
737.

Which of the following is a suboxide ?

Answer»

`CsO_(2)`
`MnO_(2)`
`C_(3)O_(2)`
`Fe_(3)O_(4)`

Answer :C
Discussion
738.

Which of the following compounds gives a secondary amine on reduction :

Answer»

Nitromethane
Nitrobenzene
Methyl isocyanide
Methyl CYANIDE

ANSWER :C
Discussion
739.

Write the steps to carry out the conversion of phenol to aspirin.

Answer»

SOLUTION :
Discussion
740.

When kept in water, raisin swells in size. Name and explain the phenomenon involved withthe help of a diagram. Give three applications of the phenomenon.

Answer»

Solution :Raisins swell in size on keeping in water. This happens DUE to the phenomenon of osmosis. The outer skin of raisin acts as a semi-permeable membrane. Water moves from a placeof lower concentration to a place of higher concentration through the semi-permeable membrane. Thus water will ENTER the raisins and make them swell.
Applications of the phenomenon
(i) Movement of water from SOIL into plant roots and subsequently into upper PORTION of theplant is partly due to osmosis. (ii) Preservation of meat against bacterial action by adding salt.(iii) Preservation of fruits against bacterial action by adding sugar. Bacterium in canned fruitloses water through the process of osmosis, shrivels and dies. (iv) Reverse osmosis is USED for desalination of water.
Discussion
741.

Write the difference between order and molecularity of reaction.

Answer»

SOLUTION :
Discussion
742.

Which of the following will react with water :

Answer»

`CHCI_3`
`CCI_4`
`CCI_3CHO`
`CH_2CICH_2CI`

ANSWER :C
Discussion
743.

Xenon best reacts with :

Answer»

The most ELECTROPOSITIVE element
The most ELECTRONEGATIVE element
The HYDROGEN halides
Non-metals

Answer :B
Discussion
744.

Which of the following metals corrodes readily in moist air

Answer»

Gold
Silver
Nickel
IRON

Solution :Iron, `Fe+H_(2)O //H^(+) RARR Fe_(2)O_(3).xH_(2)O`
Discussion
745.

Which of the following ions is coloured in solution ?

Answer»

`ZN^(2+)`
`Cu^+`
`V^(3+)`
`TI^(4+)`

Answer :C
Discussion
746.

Which of the following sulphate is inslouble in water

Answer»

`CuSO_(4)`
`CdSO_(4)`
`PbSO_(4)`
`Bi_(2)(SO_(4))_(3)`

Answer :C
Discussion
747.

When ethanol is treated with acidified K_2Cr2O_7, It arms acetic acid. It is an example of

Answer»

hydrolysis
oxidation
reduction
rearrangement

ANSWER :B
Discussion
748.

Write the balanced redox reaction and calculate the equivalent weight of oxidising agent and reducing agent for titration of K_(2)Cr_(2)O_(7) Vs Ferrous ammonium sulphate.

Answer»

Solution :The reaction : `6[FeSO_(4)(NH_(4))_(2)SO_(4).6H_(2)O]+K_(2)Cr_(2)O_(7)+7H_(2)SO_(4)rarr3Fe_(2)(SO_(4))_(3)+K_(2)SO_(4)+6(NH_(4))_(2)SO_(4)+43H_(2)O`
REDOX changes : `(E_(FeSO_(4))=(M)/(6)) , (E_(K_(2)Cr_(2)O_(7))=(M)/(6))`
Discussion
749.

You are given one litre each of 0.5 M HCl and 0.2 M HCl. Calculate the ratio in which they should be mixed so as to give maximum volume of 0.4 M HCl. What will be this volume ?

Answer»

Solution :Suppose V LITRE of 0.5 M HCl is MIXED with 1 L of 0.2 M HCl to prepare 0.4 M HCl.
Then, `""M_(1)V_(1)+M_(2)V_(2)=M_(3)(V_(1)+V_(2))` gives
`""0.5xxV+0.2xx1=0.4(V+1)`
`"or"0.5V+0.2=0.4V+0.4"or"0.1 V=0.2 "or"V=2L`
Thus, 2 L of 0.5 M HCl is needed which is not available.
Again, Suppose V litre of 0.2 M HCl should be added to 1 L of 0.5 M HCl to obtain 0.4 M HCl. Then
`M_(1)V_(1)+M_(2)V_(2)=M_(3)(V_(1)+V_(2))`
`0.2xxV+0.5xx1=0.4(V+1)`
`"or"0.2V+0.5=0.4V+0.4"or"0.2V=0.1"or"V=0.5L`
Thus, 0.5 L of 0.2 M HCl should be added to 1 L of 0.5 M HCl to obtain 0.4 M HCl. Volume of 0.4 M HCl obtained = 1.5 L.
Thus, 0.5 L of 0.2 M HCl and 0.2 M HCl should be mixed = 1 L : 0.5 L = 2 : 1
Alternatively, suppose x L of 0.5 M HCl are mixed with y L of 0.2 M HCl to make 0.4 M HCl. Then
`M_(1)V_(1)+M_(2)V_(2)=M_(3)(V_(1)+V_(2))`
`0.5x+0.2y=0.4(x+y)`
`"or"0.1x=0.2y"or"(x)/(y)=(2)/(1)`
Thus, 0.5 M HCl and 0.2 M HCl should be mixed in the RATIO of `2:1`.
As maximum amount availableis 1 L of each, this MEANS 1 L of 0.5 M HCl should be mixed with 0.5 L of 0.2 M HCl, i.e., in the ratio`2:1`
Volume of 0.4 M HCl obtained = 1.5 L.
Discussion
750.

Which ofthe followingelements is presentastheimpuritytothe maximum extentin pig iron ?

Answer»

Phosphorus
Manganese
CARBON
Silicon

SOLUTION :Pig IRON HASMAXIMUM carboncontent.
Discussion