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15551.

Which of the following substances retard the anction of oxygen on food ?

Answer»

Brine
Aluminium hydroxide
Sodium bicarbonate
Butylated HYDROXY toulene

Answer :D
Discussion
15552.

Which of the following reaction is nonspontaneous :-

Answer»

`2F_(2) +2H_(2)O to 4HF (aq) +O_(2)`
`Cl_(2) +H-OH to HCl +HOCl`
`Br_(2) +H-OH to HBr +HOBr`
`2I_(2) +2H_(2)O to 4HI +O_(2)`

Solution :`I_(2)+H_(2)O to HI +O_(2)` reaction non spontaneous because `I_(2)` is strong REDUCING AGENT
Discussion
15553.

Which preservation in used in fats ?

Answer»

BHA
Dettol
phenol
Boric acid

Answer :A
Discussion
15554.

Whichamongthefollowingreacgents convert alkyl halids intoalkane?

Answer»

`Bu_(3)SnH`
NA ..DRY ether
`R_(2)CuLi`
all of these

Answer :D
Discussion
15555.

What sequence of reactions would best accomplish the following reaction?

Answer»

<P>`I. LiAlH_(4)` in ETHER
II. `CH_(3)I` followed by HEATING with AgOH
`I. LiAIH_(4)` in ether
`II. P_(2)O_(5)` and heat
`I. 20% H_(2)SO_(4)` and heat
`II. P_(2)O_(5)` and heat
`I. H_(2)` and Lindlar's catalyst

Solution :
Discussion
15556.

Which of the following will be the least reactive towards nucleophilic substitution?

Answer»

`c_2 H_5CI`
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` (##AKS_NEO_CAO_CHE_XII_V02_P03_APP_E01_029_O03.png" width="30%">

ANSWER :D
Discussion
15557.

Which property of an element is always a whole number ?

Answer»

ATOMIC weight
equivalent weight
atomic number
atomic volume

Answer :C
Discussion
15558.

Which of the following does not contain magnesium

Answer»

MAGNETITE
Asbestos
Magnesite
Carnallite

Solution :NA
Discussion
15559.

When NaCl ( or ) KCl is heated with conc. H_(2) SO_(4) and solid K_(2)Cr_(2) O_(7), we get -vapours

Answer»

chromic sulphate
Chromic CHLORIDE
Chromyl chloride ( `CrO_(2) Cl_(2)` )
Chromous chloride

SOLUTION :(a) `Cl^(-) + K_(2) Cr_(2) O_(4) + H_(2) SO_(4) RARR CrO_(2) Cl_(2) + KHSO_(4)+HSO_(4)^(-) +H_(2)O`
(c ) `CrO_(2) Cl_(2) rarr` Chromylchloride
Discussion
15560.

Write the monomers of the following polymer:

Answer»

SOLUTION :HCHO (or NAMES of MONOMERS)
Discussion
15561.

Which of the following is 100% ionised at any dilution ?

Answer»

`CH_(3)COOH`
HCN
NaCl
`NH_(4)OH`
Discussion
15562.

What is the difference between hormones and vitamins?

Answer»

SOLUTION :The MAIN POINTS of DIFFERENCE are :
.
Discussion
15563.

Which of the following statement is correct for CsBr_(3)

Answer»

It is a covalent compound <BR>It CONTAINS `Cs^(3+)` and `Br^(-)` ions
It contains `Cs^(+)` and `Br_(3)^(-)` ions
It contains `Cs^(+)` and `Br^(-)` and lattice `Br_(2)` molecule

Solution :`CsBi_(3)` MAY be REPRESENTED as `Cs^(+) Br_(3)^(-)`
Discussion
15564.

Which one of the following statements related to lanthanons is incorrect?

Answer»

EUROPIUM shows +2 oxidation state.
The basicity decreases as the ionic RADIUS decreases from Pr to Lu
) All the lanthanons are much more reactive than aluminium
`CE^(4+)` solutions are widely used as oxidising agents in volumetric analysis.

Solution :As we move from LA to Lu, their metallic behaviour because almost similar to that of aluminium.
Discussion
15565.

The spicies that undergo disproportionanion in alkaline medium are

Answer»

`Cl_(2)`
`MnO_(4)^(-2)`
`NO_(2)`
`ClO_(4)^(-)`

Solution :`Cl_(2) + 2NAOH RARR NaCl+ NaOCl +H_(2)O`
`2NO_(2) + 2NaOH rarr NaNO_(2) + NaNO_(3)+ H_(2)O`
Discussion
15566.

Which of the following graphs correctly represents the variation of beta=-(dV//dP)/V with P for an ideal gas at constant temperature?

Answer»




ANSWER :A
Discussion
15567.

Which one of the following is not applicable to the phenomenon of adsorption ?

Answer»

`DeltaH gt 0`
`DELTAG lt 0`
`DELTAS lt 0`
`DeltaH lt 0`

SOLUTION :`DeltaH gt 0`
Discussion
15568.

The second ionisation energy is maximu for :

Answer»

Boron
Beryllium
MAGNESIUM
ALUMINIUM

ANSWER :A
Discussion
15569.

The three dimensional graph of lattice points which sets the pattern of whole lattice is called …….

Answer»

SPACE lattice 
Simple lattice 
Crystal lattice 
UNIT CELL 

Answer :D
Discussion
15570.

Which of the following gaseous molecule has maximum physical adsorption enthalpy?

Answer»

`C_(2)H_(6)`
`H_(2)O`
`H_(2)`
`Ne`

Answer :B
Discussion
15571.

The standard emf for the cell reaction, Zn+Cu^(2+) =Cu+Zn^(2+)is 1.10 volt at 25^@C. The emf for the cell reaction, when 0.1MCu^(2+) and 0.1 MZn^(2+) solutions are used , at25^@C is:

Answer»

`1.10V`
`1.110V`
`-1.10V`
`-0.110V`

ANSWER :A
Discussion
15572.

The unknown organic compound reacts with hydroxyl amine and followed by oxidation using trifluoroperoxy acetic acid gives 3-nitro pentane. The unknown organic compound is

Answer»




SOLUTION :`CH_(3) - CH_(2)- overset(O)overset(||)(C) - CH_(2) - CH_(3) + NH_(2) - OH overset(-H_(2)O)to`
`CH_(3) - CH_(2) - overset(NOH)overset(||) (C) - CH_(2) - CH_(3) overset("Oxidation")to CH_(3) - CH_(2) - overset(NO)overset(|)(CH)- CH_(2) - CH_(3)`
Discussion
15573.

Write the correct pair of reactants for the preparation of t-butyl ethyl ether by Williamson synthesis.

Answer»

SOLUTION :
Discussion
15574.

Which group is called buffer group of the periodic table

Answer»

I
VII
VIII
Zero

Solution :Zero GROUP is CALLED a buffer group because it lies between highly ELECTRONEGATIVE halogens and hihgly ELECTROPOSITIVE alkali metal ELEMENTS.
Discussion
15575.

The standard heat of formation ofsodium ions in aqueous solution from the following data: Heat of formation of NaOH(aq) from NaOH(s) at 25^@C=-470 kJ Heat of formation of OH-(aq) from OH-(s) at 25^@C=-228.8 kJ .

Answer»

`-251.9`
241.9 KJ
`-241.9 kJ`
151.9 kJ

Answer :C
Discussion
15576.

The stability of lyophilic collid is due to which of the following :

Answer»

CHARGE on their particles
Large SIZE of their particles
Small size of their particles
Solvation by dispersion medium

Solution :Lyophillic COLLOID is solvated by dispersion medium and BECOMES more stable.
Discussion
15577.

Which factors influence the properties Of crystalline­solids ?

Answer»

SOLUTION :Properties of CRYSTALLINE’ solids depend UPON the NATURE of , interactios between their constituent PARTICLES.
Discussion
15578.

What is the magnetic momentum of aqueous solution of Ni^(2+) ?

Answer»

4.90BM
0.0BM
1.73BM
2.84BM

Solution :`Ni^(2+) : 3d^(8)`
`:.` UNPAIRED ELECTRONS =2
`:. MU= sqrt(2(2+2)) = 2SQRT2= 2.84BM`
Discussion
15579.

Write the structure of Sulphuric acid.

Answer»

SOLUTION :`O=OVERSET(H)overset(|)overset(O)overset(|)UNDERSET(H)underset(|)underset(O)underset(|)S=O`
Discussion
15580.

What is wrongly stated about electrochemical series

Answer»

It is the representation of element in order of increasing or decreasing standard electrode REDUCTION potential
It does not compare the relative REACTIVITY of metals
It compares relative STRENGTHS of oxidising agents
`H_(2)` is centrally placed element

Solution :ELECTROCHEMICAL series compare the relative reactivity of metals.
Discussion
15581.

Weight of solute (M. wt 60) that is required todissolve in 180 g water to redure the vapour pressure to 4//5thof purewater is 50x g . Xis

Answer»


ANSWER :3
Discussion
15582.

Which of the following is a pair of functional group :-

Answer»




`CH_3-oversetoverset(O)(||)C-H` & `CH_3-oversetoverset(O)(||)C-CH_3`

ANSWER :C
Discussion
15583.

What are inner transition elements ? Decide which of the following atomic numbers are the atomic numbers of the inner transition elements : 29, 59, 74, 95, 102, 104.

Answer»

Solution :The f-block elements, i.e., in which the LAST electron enters the f-subshell are CALLED inner-transition elements. These include LANTHANOIDS (58-71) and ACTINOIDS (90-103). ACCORDINGLY, elements with atomic numbers 59-95 and 102 are inner transition elements.
Discussion
15584.

Write structural formulae for the following : (i) IF_5 (ii) XeOF_2

Answer»

SOLUTION :STRUCTURE of `IF_5 and XeOF_2` are GIVEN below :
Discussion
15585.

The structure of compound Y:

Answer»

`Ph-OVERSET(O)overset("||")C-O-Ph`
`Ph-overset(O)overset("||")C-NH-Ph`
`Ph-overset(O)overset("||")C-Ph`

ANSWER :C
Discussion
15586.

Which of the following does not respond Fehling's solution ?

Answer»

ACETALDEHYDE,
GLUCOSE,
BENZALDEHYDE,
Fromaldehyde

Answer :A::B::D
Discussion
15587.

Which statement about aspiring is not true ?

Answer»

Aspirin BELONGS to narcotic ANALGESICS
It is EFFECTIVE in relieving pain
It has antiblood CLOTTING action
It is a neurologically ACTIVE drug.

Solution :Aspirin is a non-narcotic analgesic.
Discussion
15588.

Which of the following compounds give a yellow precipitate with iodine and aqueous NaOH solution ?

Answer»

2-hydroxy PROPANE
ACETOPHENONE
METHYL ACETATE
Acetamide

Answer :D
Discussion
15589.

Write the characteristics of adsorption.

Answer»

Solution :Characteristics of adsorption :
(i) Adsorption can occur in all interfacial SURFACES i.e. the adsorption can occur in between gas-solid, LIQUID -solid, liquid -liquid, solid- solid and gas-liquid. (ii) Adsorption is always accompanied by decrease in FREE energy. When `DeltaG` reaches zero, the equilibrium is attained. (iii) Adsorption is a spontaneous process. (IV) When molecules are adsorbed, there is always a decrease in randomness of the molecules. We know, `DeltaG = DeltaH - T Delta S ` where `DeltaG`is Change in Free energy. `DeltaH` is Change in enthalpy and `DeltaS` - Change in entropy. Hence, `DeltaH = Delta G + T Delta S` . (v)Adsorption is EXOTHERMIC as there is an interaction between adsorbate and adsorbent.
Discussion
15590.

Which of the following is a property of colloid?

Answer»

Brownian movement
Heterogeneous nature
High INSTABILITY
SCATTERING of light

Answer :A
Discussion
15591.

When an oxide of Mn (C). Identify A, B, C.

Answer»

SOLUTION :`C : KMnO_(4)`
Discussion
15592.

The weight of nickel (at.mass = 58.78) liberated by a current of 5 ampere flowing for 193 second through NiSO_(4) solution is

Answer»

`0.587` g
`5.87 `g
`0.2935` g
`2.935` g

SOLUTION :A/C to FARADAY's `1^(st)` law
`W_(Ni) = (58.7 xx 5 xx 193)/(2 xx 96500) = 0.2935` g
Discussion
15593.

Which does not give borax bead test?

Answer»

Pb
Cu
Cr
Fe

Solution :BORAX BEAD test does not RESPOND to colourless ions. `Pb^(2+)` salts are colourless.
Discussion
15594.

Write structures of different dihalogen derivaties of propane.

Answer»

Solution : Different dihalogen derivatives of PROPANE are given below:
`underset("1,3-Dibromopropane ") (BrCH_(2) - CH_(2) - CH_(2)Br) "" underset("1,2-Dibromopropane ")(BrCH_(2) - underset(Br)underset(|)CH - CH_(3))"" underset("1,2-Dibromopropane ")(Br - underset(Br)underset(|)CH - CH_(2) - CH_(3)) underset("2,2-Dibromopropane ")(CH_(3) - underset(Br "" Br)underset(|)C- CH_(3))`
Discussion
15595.

Which electronic configuration belongs to an element of group 16?

Answer»

`[He] 2S^(2)2p^(2)`
`[Ne]^(2) 3s^(2) 3p^(4)`
`[Ar] 3d^(5) 4S^(1)`
`[Ar] 3d^(10) 4s^(2) 4p^(6)`

SOLUTION :Group 16th ELEMENT have `ns^(2) np^(4)` configuration of outermost shell (valence-shell).
Discussion
15596.

Which of the following metal is found in green colouring pigments chlorophyll of plants

Answer»

FE
MG
Na
Al

ANSWER :B
Discussion
15597.

Which ofthe following reactions does not gields

Answer»

METHYL acetate
ACETONITRILE
ACETAMIDE
Diethyl ether

Solution :NA
Discussion
15598.

When silver chloride dissolves in ammmonia, it forms:

Answer»

`Ag(NH_3)CL`
`Ag(NH_3)_2Cl`
`Ag(NH_3)_3Cl`
`Ag(NH_3)_4Cl`

Answer :B
Discussion
15599.

When NaNO_(3) is heated in a closed vessel, oxygen is liberated and NaNO_(2) is left behind. At equlibrium

Answer»

Addition of `NaNO_(2)` favours reverse reaction
Addition of `NaNO_(3)` favours forward reaction
Increasing temperatue favours forward reaction
Increasing pressure favours reverse reaction

Solution :`2NaNO_(3)hArr2NaON_(2)+O_(2)`
According to Le-chatelier principle an increase in pressure ALWAYS favours the reactin, where volume or MOLES decrease (i.e., reverse direction). As heat is added, i.e., reactin is endothermic and is SUPPORTED in forward direction with increase in temperature.
Discussion
15600.

Trivial name of CC_6H_5NH_2 IS

Answer»

CYCLOHEXYLAMINE
Phenylamine
Benzylamine
Aniline

Answer :D
Discussion