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20151.

Write the structures of the following compounds: (i) alpha-Methoxypropionaldehyde (ii) 3-Hydroxybutanal (iii) 2-Hydroxycyclopentanecarbaldehyde (iv) 4-Oxopentanal (v) Di-sec-butyl ketone (vi) 4-Fluroacetophenone.

Answer»

SOLUTION :
Discussion
20152.

Write the formulae for the follow Co-ordination compounds Dichlorido bis-(ethane-1,2-diamine) platinum (IV) nitrate

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SOLUTION :`[PtCl_2(EN)_2](NO_3)_2`
Discussion
20153.

When a mixture of concentrated aqueous solutions of sodium salts of two monocarboxylic acids is electrolysed, a mixtureof ethane, propane and butane is obtained at the anode. The two acids are-

Answer»

`CH_3COOH,CH_3CH_2COOH`
`CH_3COOH,HCOOH`
`CH_3COOH,CH_3CH_2CH_2COOH`
`(CH_3)_2CHCOOH,CH_3COOH`

ANSWER :A
Discussion
20154.

Which of the followingis nota biopolymer ?

Answer»

PROTEINS
CELLULOSE
STRACH
POLYPROPYLENE

ANSWER :D
Discussion
20155.

Which of the folllowing ion will be aromatic in nature ?

Answer»




SOLUTION :
Discussion
20156.

The shield effect of electron decreases in the order

Answer»

`f GT d gt p gt s`
`s gt p gt d gt f `
`s gt d gt p gt f `
`p gt d gt s gt f `

Solution :We know that, shielding EFFECT of orbitals depends upon shape of orbitals. F-orbitals has diffused shape, HENCE f-orbitals has poor shielding effect. It decreases in th ORDER,
`s gt p gtd gt 4f gt 5t.`
Discussion
20157.

Which of the following compounds does not have a carboxyl group ?

Answer»

BENZOIC ACID
Palmitic acid
PICRIC acid
Oleic acid

Solution :Picric acid is TRINITROPHENOL.
Discussion
20158.

The species with all paired electrons exhibit ……

Answer»

SOLUTION :DIAMAGNETISM
Discussion
20159.

What is the formula of Diaquadiododinitrito -k O palladium (IV) ?

Answer»

`[Pd I_(2)(ONO)_(2)(H_(2)O)_(2)]`
`[Pd I_(2)(NO_(2))_(2)(H_(2)O)_(2)]`
`[Pd I_(2)(NO_(3))_(2)H_(2)O]`
`[Pd I_(2)(NO_(3))(H_(2)O)]`

ANSWER :A::B::D
Discussion
20160.

What is carbylamine reaction?

Answer»

Solution :Reaction between a primary AMINE with `CHCl_3` in presence of KOH, leading to the formation of an ISOCYANIDE is known as CARBYLAMINE reacton, e.g.,
` (##KAL_KLC_ISC_CHE_XII_C13_E02_132_S01.png" width="80%">
Discussion
20161.

Thermodynamic standard conditions of temperature and pressure are

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`0^(@)C and 101.3` KPA
298 K and 1 atm
273 K and 101.3 kPa
`0^(@)C` and 1 atm

Solution :Thermodynamic standard CONDITIONS of temperature and pressure are
`T = 25^(@)C = 25 + 273 = 298`K
`P = 1` atmosphere.
Discussion
20162.

Which one of the following statements about starch is correct?

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It occurs in the cell wall of plants 
It is a disaccharide 
It GIVES a DARK BLUE colour with iodine SOLUTION 
It gives an orange red precipitate on BOILING with Fehling's solution 

Answer :C
Discussion
20163.

Which of the following relations gives the mathematical expression for the combined first and second law of thermodynamics?

Answer»

`DeltaG=VDeltap-SDeltaT`
`DeltaA=-pDeltaV-SDeltaT`
`DeltaU=TDeltaS-pDeltaV`
`DeltaH=TDeltaS-VDeltap`

ANSWER :C
Discussion
20164.

Write the principle involved in zone refining .

Answer»

SOLUTION :The IMPURITIES are more soluble in the MOLTEN state of METAL than in solid state.
Discussion
20165.

The temperature at which the root mean square speed of SO_2molecule is same as that of methane at 27^@ C.

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600 K
900 K
1200 K
400 K

Answer :C
Discussion
20166.

What is the monomer unit of protein ? Give two examples of monomers , one of which contains sulphur. Write the zwitterionic form of one of them.

Answer»

SOLUTION :The monomer unit of proteins is `alpha`-amino acids. TWO examples and their zwitterionic FORMS are :
Discussion
20167.

Which of the following statements is not correct.

Answer»

Some antiseptics can be ADDED to soaps
Dilute solutions of some disinfectants can be USED as ANTISEPTIC
Disinfectants are antimicrobial drugs
Antiseptic medicines can be INGESTED.

Solution :Antiseptic medicines cannot be ingested.
Discussion
20168.

Which is the correct order of ionic sizes (At. No. : Ce=58, Sn=50, Yb=70 and Lu=71)

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`CegtSngtYbgtLu`
`SngtCegtLugtYb`
`LugtYbgtSngtCe`
`SngtYbgtCegtLu`

SOLUTION :CORRECT ORDER of IONIC SIZE is `SngtCegtLugtYb`.
Discussion
20169.

What are different types of points defects ?

Answer»

Solution :Point defects are of three types stoichiometric defects, impurity defects and non - stoichiometric defects.Vacancydefects and interstitialaldefectaas are the two basic types of stoichiometric, point defects. In ionic SOLID, these defects arecaused by the presence of an impurity in the crystal.In ionic solids, when the ionic impurity has a different VALENCE than the main COMPOUND, some vacanciesare created . Non stoichiometric defects are of metal excess type and metal deficient type.
Discussion
20170.

The strained tetracyclic alkane is isomerize thermally to the cyclic alkene. The reaction involves

Answer»

FREE radical
carbocation
carbanion
carbene.

Solution :
Discussion
20171.

The transition metal present in vitamin B_12 is:

Answer»

Fe
Co
Ni
Na

Answer :B
Discussion
20172.

Which of the following reagents does not give acid chloride on treating with an acid ?

Answer»

`PCl_(5)`
`PCl_(3)`
`SOCl_(2)`
`Cl_(2)`

Answer :D
Discussion
20173.

When sodium benzene sulphonate is fused with sodium hydroxide the product formed is

Answer»

BENZENE
PHENIL,
Benzene triophenol
NONE of these
Discussion
20174.

Two solutions A andB are separated by semipermeable membrane. If liquid flows from A to B then

Answer»

A is more concentrated than B
A is less concentrated than B
both solutions have same CONCENTRATION
NONE

Solution :OSMOSIS OCCURS from DILUTE solution to concentrate solution.
Discussion
20175.

Which of the following pair contains both anitferromagnetic substances ?

Answer»

`V_2O_5, MnO_2`
`CUO, FE`
`NIO, CrO_2`
`Mn_2O_3, MNO`

ANSWER :D
Discussion
20176.

Under the influence of electric field, which of the following statements is true about the movement of electrons and holes in a p-type semiconductor ?

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Electron will move TOWARDS the positively charged plate through electron HOLES. 
Holes will appear to be MOVING towards the negatively charged plate. 
Both ELECTRONS and holes appear to move towards the positively charged plate. 
Movement of electrons is not related to the movement of holes. 

Solution :In p-type semiconductors, the CONDUCTION takes place through holes. In presence of electric field the holes move towards negatively charged plate while electron flows toward positively charged plate.
Discussion
20177.

Which one is used to prepare non-stick kitchen vessels ?

Answer»

Nylon-6
POLYSTYRENE
Bakelite
TEFLON

SOLUTION :Teflon
Discussion
20178.

Write three differences between true solution and colloidal solution

Answer»

SOLUTION :
Discussion
20179.

Which one of the following is an example of thermosetting polymer ?

Answer»




Solution :Linear polymer of PHENOL and formaldehyde is called Novolac. If further UNDERGOES cross- LINKING to produce bakelite which is a THERMOSETTING polymer.
Discussion
20180.

Which of the following does not contain material particles?

Answer»

`ALPHA`-RAYS
`BETA`-rays
`GAMMA`-rays
Anode rays

Answer :C
Discussion
20181.

Which one of the following statement is NOT correct fro the given reaction ?

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iron is the reducing agent
the solution turngree INCOLOUR after the reaction
copper is more REACTIVE metal than iron
the reaction is an example of redox reaction

Solution :Copper is not more reactive than iron `Cu^(+)FeSO_(4)Cu^(+),Na^(+),Mg^(2+)`
As you can SEE copper doesnot DISPLACE iron from its solution since it is less reactive than irona more reactivemetal displacesa less reactive metal from its solution
Discussion
20182.

Which of the following is not a source of vitamina-A

Answer»

MILK 
LIVER 
Yeast 
Egg

Answer :C
Discussion
20183.

Which of the following is strong base

Answer»

`CH_3ONa`
`NAOH`
KOH
`Na_2CO_3`

ANSWER :A
Discussion
20184.

There are several ways in which we can express the concentration of a solution.

Answer»


ANSWER :TRUE
Discussion
20185.

Which halogen reacts with hydrogen even in the dark?

Answer»

`Br_2`
`F_2`
`I_2`
`Cl_2`

ANSWER :B
Discussion
20186.

Which of the following does not under Lewis acid-basic reaction?

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`CO_(2)+H_(2)O`
`AlCl_(3)+Cl^(-)`
`SF_(6)+BF_(3)`
`B(OH)_(3)+H_(2)O`

Answer :C
Discussion
20187.

Which of the following radicals does not belong to group I?

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`Ag^(+)`
`Pb^(2+)`
`Hg_(2)^(2+)`
`HG^(2+)`

SOLUTION :`Hg^(2+)` is not precipitated as CHLORIDE but is precipitated in group II as sulphide.
Discussion
20188.

What happens when ferrous sulfide is treated with dil. H_2SO_4 ?

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Solution :`H_2S` GAS is evolved.
`FES + underset("DIL.")(H_2SO_4) rarr FeSO_4 +H_2S`
Discussion
20189.

Which of the following statement is correct regarding the slag obtained during the extraction of a metal like copper or iron ?

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The slag is lighter and has higher melting POINT than the METAL.
The slag is lighter and has lower melting point than the metal.
The slag is HEAVIER and has higher melting point than the metal.
The slag is heavier and has lower melting point than the metal.

Solution :Slag is lighter, has lower m.pt. than metal, FLOATS and can be skimmed off.
Discussion
20190.

Which one of the following pairs of solutions is not an acidic buffer

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`HClO_(4)` and `NaClO_(4)`
`CH_(3)COOH` and `CH_(3)COONA`
`H_(2)CO_(3)` and `Na_(2)CO_(3)`
`H_(3)PO_(4)` and `Na_(3)PO_(4)`

SOLUTION :Strong acid with its salt can not form BUFFER solution.
Discussion
20191.

What is the C-O-H bond angle in phenol ?

Answer»

`108.5^(@)`
`109^(@)`
`108^(@)`
`111.7^(@)`

SOLUTION :`109^(@)`
Discussion
20192.

When 20 g of naphthoic acid (C_(11)H_(8)O_(2)) is dissolved in 50 g of benzene (K_(f)=1.72 "K kg mol"^(-1)) a freezing point depression of 2K is observed. The Van't Hoff factor (i) is :

Answer»

0.5
1
2
3

Solution :`DeltaT_(f)=iK_(f)m`
`m=((20)/(172)xx1000)/(50)=2.326`
`:.2=ixx1.72xx2.326`
or `i=(2)/(1.72xx2.316)=0.50`
Discussion
20193.

The strongest acid is

Answer»

`H_(3)AsO_(4)`
`H_(3)AsO_(3)`
`H_(3)PO_(3)`
`H_(3)PO_(4)`

Solution :`H_(3)PO_(4)` and `H_(3)AsO_(4)` both have +5 oxidation state. But for same oxidation state, strength of OXY acids decrease, with increase in size.
Discussion
20194.

Two immiscible liquids can be easily seprated by :

Answer»

Sublimation
Separating funnel
Chromatography
Fractional distillation

Answer :B
Discussion
20195.

The values of equivalent conductivity at infinite dilutions for NH_4Cl, NaOH and NaCl are respectively149.74, 248.1 and 126.4 "ohm"^(-1) cm^(2) "equi"^(-1). The value of lambda_(eg)^(oo) of NH_4OH is

Answer»

`371.44`
`271.44`
`71.44`
It cannot be CALCULATED from the DATA GIVEN

ANSWER :B
Discussion
20196.

Which of the following undergo reimer tiemann reaction ?

Answer»




ANSWER :A,B
Discussion
20197.

The unique behaviour of CU, having a positive E^(@) (reduction potential) accounts for its inability to liberate H_(2) from acids,. Only oxidising acids (nitric acid and hot concentrated sulphuric acid) react with Cu. The high energy of transform Cu(s) to Cu^(2+)(aq.) is not balanced by its hydration enthalpy. On the other hand, All Cu(II) halides are known except iodide. in this case, Cu^(2+) oxidises I^(-) to I_(2): 2Cu^(2+)+4I^(-) to 2CuI(s)+I_(2) However, copper (I) compounds are unstable in aqueous solution annd undergo disproportionation. 2Cu^(+)(aq.)toCu^(2+)(aq.)+Cu The stability of Cu^(2+)(aq.) rather than Cu^(+)(aq) is due to the much more negative Delta_(Hyd) of Cu^(2+)(aq.) than Cu^(+)(aq.) Q. Select the correct chemical change:

Answer»

`CU+Dil.H_(2)SO_(4) to CuSO_(4)+H_(2)(g)`
`Cu+dil.HNO_(3) to Cu(NO_(3))_(2)+N_(2)O(g)`
`CuSO_(4)(AQ.)+KCN(EXCESS)toK_(2)[Cu(CN)_(4)]`
`CuSO_(4)(aq.)+NH_(4)OH to Cu(OH)_(2)darr`

Solution :`Cu^(2+)(aq.)+2CN^(-)(aq.)tounderset("Unstable")(Cu(CN)_(2)) OVERSET(I.M.R.)to CuCN darr+(CN)_(2)uarr`
`CuCN darr+underset("Excess")(3KCN) hArr underset("Colourless "soln."")(K_(3)[Cu(CN)_(4)])`
Discussion
20198.

What forces are responsible for stability of alpha-helix ?

Answer»

Solution :`alpha`-Helix STRUTURE is stabilized by INTRAMOLECULAR H-bonding between `N-H` of one `alpha`-amino acid residue and `C=O` of the fourth amino acid residue WITHIN the polypeptide CHAIN .
Discussion
20199.

Which of the following ore contain both magnesium and calcium

Answer»

MAGNESITE
Dolomite
Carnellite
Phosphorite

Answer :B
Discussion
20200.

Which of the following compounds have non zero dipole moment.

Answer»

`C Cl_(4)`


ANSWER :B
Discussion