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14051.

What si obtained when CrO_(3) is dissolved in NaOH?

Answer»

`CrO_(4)^(2-)`
`Cr(OH)_(2)`
`Cr_(2)O_(7)^(2-)`
`Cr(OH)_(3)`

ANSWER :A
Discussion
14052.

Write the unit of molality of a solution.

Answer»

SOLUTION :`"MOL"//KG^(-1) or " mol"//kg`
Discussion
14053.

What happens when soda lime is treated with (i) CH_(3)COONa (ii) C_(6)H_(5)COOH ?

Answer»

Solution :(i) Decarboxylation : When ANHYDROUS sodium salt of carboxylic ACIDS are heated with sodalime, carboxyl group is removed with the formation of HYDROCARBON containing one carbon atom less.
`underset("Sodium acetate")(CH_(3)COONa)overset(NaOH//CaO)tounderset("methane")(CH_(4))+Na_(2)CO_(3)`
(ii) Heating benzoic acid with sodalime GIVES benzene.
`C_(6)H_(5)COOHunderset(CaO Delta "soda lime")overset(NaOH)toC_(6)H_(6)+CO_(2)`
Discussion
14054.

Why amines are less soluble in water as compared to alcohols?

Answer»

SOLUTION :Amines are less SOLUBLE in water as compared to alcohols. This is because of their WEAKER hydrogen BONDING with water.
Discussion
14055.

Which of the following contains cationic iodine ?

Answer»

`IF_(7)`
`ICL`
`I(CH_(3)COO)_(3)`
None of these

Solution :CATIONIC iodine is `I^(+) Cl^(-) , I^(2+) ( CH_(3) COO)_(2)^(-)`
Discussion
14056.

Which of the following pair is incorrectly matched ?

Answer»

Magnetite `-Fe_(3)O_(4)`
Copper glance `-Cu_(2)S`
CALAMINE`- ZnCO_(3)`
Zincitic-ZnS

Solution :ZINCITE is ZnO.
Discussion
14057.

Which one of the following ststement is incorrect?

Answer»

Greater the LOWERING nof vapour pressure, greater is the boiling point of the solution
Greater the lowering of vapour pressure, greater is the FREEZING point of the solution.
At the freezing point, the SOLUTE and the solvent have same vapourpressure
The units of molal depression CONSTANT are `K m^(-1)`.

Solution :Greater the lowering of V.P., greater is the depression in F.pt, i.e., lower is actual F pt.
Discussion
14058.

Which of the following reagent will be able to distinguish between vinyl bromine and n-propyl bromide ?

Answer»

aqueous `AgNO_(3)`
`NaOH, HNO_(3), AgNO_(3)`
`K_(2)Cr_(2)O_(7)//H_(2)SO_(4)`
Tollen's reagent

Solution :n-Propyl BROMIDE gives yellow PPT. with `NaOH, HNO_(3), AgNO_(3)`.
Discussion
14059.

WritetheHaworth'sstructureofLactose.

Answer»

SOLUTION :
Discussion
14060.

Which of the following reacts most slowly with nitric acid.

Answer»

Phosphorus
Chlorine
Sulphur
IODINE

ANSWER :B
Discussion
14061.

The reagent ' X ' used for the following reaction is R - C -= C- R'+H_2 overset(X)rarr

Answer»

Ni
Pd/C
`LiAlH_4`
`NA//"liquid"NH_3`

SOLUTION :cis-Alkene is OBTAINED by USING Pd/C as a catalyst.
Discussion
14062.

Which acid derivatives on hydrolysis will give brown precipitate with Nessler.s reagent :

Answer»

ACID chloride
Acid anhydride
Acid amide
All

Answer :C
Discussion
14063.

Which of the following is the best nuclear fuel?

Answer»

`.^(238)U`
`.^(236)U`
`.^(239)Pu`
`.^(239)Np`

ANSWER :C
Discussion
14064.

Which of the following is most basic

Answer»

`CH_(3)-NH_(2)`


ANSWER :A
Discussion
14065.

Viscosity of sulphur increases when molten sulphur is heated from 120^(@)C" to "160^(@)C. Why

Answer»

SOLUTION :At `119^(@)C`, sulphur forms a clear mobile LIQUID.
A When this liquid is further HEATED, the cleavage of octaatomic ring structure occurs. Zig-zag OPEN chains are formed, which get interwound and tangled together. Hence sulphur BECOMES more viscous.
Discussion
14066.

The values of observed and calculated molecular weights of silver nitrate are 92.64 and 170 respectively. The degree of dissociation of silver nitrate is

Answer»

`60.23%`
`83.5%`
`46.7%`
`60%`

ANSWER :B
Discussion
14067.

Which of the following isomerism is not shown by alcohols?

Answer»

CHAIN
Position
Functional
METAMERISM

Solution :The hydroxyl group is not a polyvalent functional group. Metamerism is shown only by the polyvalent functional GROUPS such as ESTER, secondary AMINES, ketones etc.
Discussion
14068.

Which of the following is/are correctly matched ?

Answer»

Copper-Bessemer CONVERTER
Iron-Blast furnance
Chromium - Aluminothermic process
TIN-Electrolytic REDUCTION

Solution :(A)Self reduction takes PALCE in Bessemer converter.
(B)SLAG formation and reduction of haematite to iron take place in blast furnace at different temperature
(C )`Cr_2O_3+AltoAl_2O_3+2Cr`.
This is called aluminothermic process.
(D)Tin is obtained by carbon reduction of `SnO_2` (cassiterite ore)
Discussion
14069.

Which of the following ions will give coloured solution ?

Answer»

`CU^(+)`
`Fe^(2+)`
`ZN^(2+)`
`Ag^(+)`

Answer :B
Discussion
14070.

Which of the following is dye

Answer»

METHYL orange
Orange I
Aniline yellow
All of these

Answer :D
Discussion
14071.

Which of the folliwng has the highest dipole moment?

Answer»




SOLUTION :
Net DIPLE VECTOR is more in (d).
Discussion
14072.

What is CFSE of complex ion [FeF_(6)]^(4-) in terms of Dq?

Answer»


ANSWER :4
Discussion
14073.

Which of the following vitamins is present in cod-liver oil:

Answer»

`A`
`B_12`
`B_1`
`C`

ANSWER :A
Discussion
14074.

The value of gas constant R in joules is :

Answer»

8.314 `JK^(-1) mol^(-1)`
0.0821 `JK^(-1) mol^(-1)`
`8.314 XX 10^(7) JK^(-1) mol^(-1)`
`1.99 JK^(-1) mol^(-1)`

Answer :A
Discussion
14075.

The weight ratio of Al and Ag deposited using the same quantity of curren is :

Answer»

`9:108`
`2:12`
`108:9`
`3:8`

ANSWER :A
Discussion
14076.

Write the chemical name of vitamin B)_(12).

Answer»

SOLUTION :CYANOCOBALAMIN.
Discussion
14077.

The second ionisation enthalpies of both Cr and Cu are higher than those of the next element. Explain.

Answer»

Solution :This is because the outer electronicconfiguration of `Cr^(+)` is `3d^(5)` ( HALF - FILLED ) and that of `Cu^(+)` is `3d^(10)` ( completely filled ). The SECOND ionisationof Cr means the REMOVAL of ONE electron from the highly stable `3d^(5)` core. Similarly, the second ionisation of Cu needs removal of one electron from highly stable `3d^(10) ` core.
Discussion
14078.

Which of the following ions would have the minimum coagulating value for sol obtained on peptizing Sn(OH)_(4) by little NaOH solution.

Answer»

`Cl^(-)`
`SO_(4)^(2-)`
`k^(+)`
`Ba^(2+)`

Solution :Minimum coagulating VALUE will be for the ION with maximum charge and since the SOL particles are NEGATIVELY charged, hence positively charged are REQUIRED for coagulations.
Discussion
14079.

Write the correct formulae for the following coordination compounds : CrCl_(3).6H_(2)O (dark green colour, with 1 chloride ion precipitated as AgCl)

Answer»

Solution :Chlorine ATOMS outside the COORDINATION sphere react with silver ions to give silver chloride.
`[CrCl_(2)(H_(2)O)_(4)]Cl.2H_(2)O`
Tetraaquadichloridochromium monochloride dihydrate
Discussion
14080.

Which one of the following can be used as monomer in a polymerisation reaction ?

Answer»

`CH_3CH_2Cl`
`CH_3CH_2OH`
`C_6H_6`
`C_3H_6`

Solution :`C_(3)H_(6)` has a DOUBLE bond and linear MOLECULE hence polymerises easily.
Discussion
14081.

Write the composition of dettol. Dettol is an example of which kind of drug? It is an antiseptic.

Answer»

SOLUTION :A mixture of CHLOROXYLENOL and `ALPHA`terpineol in a suitable solvent
Discussion
14082.

Which is true in the case of[Ni(CO)_(4)] complex :

Answer»

Hybridisation of Ni is `sp^(3)`
TETRAHEDRAL shape of the molecule
Diamagnetic
None of these

SOLUTION :After electronic rearrangement, all orbitals are PAIRED up.
Discussion
14083.

Which one of the followingprocesses will produce hard water

Answer»

addition of `Na_(2)SO_(4)` to water
satureation of water with `CaCO_(3)`
saturation of waterwith `MgCO_(3)`
saturation of water with `CaSO_(4)`

Answer :B
Discussion
14084.

Which one of the following compounds, each with two carbons will have the highest boiling point :

Answer»

`C_2H_5OH`
`CH_3-O-CH_3`
`CH_3COOH`
`CH_3CHO`

ANSWER :C
Discussion
14085.

What is the number of unpaired electron in the complex ion [CoF_(6)]^(3-)

Answer»


ANSWER :4
Discussion
14086.

Which one of the following statements regarding photochemical smog is not correct?

Answer»

Carbon monoxide does not PLAY any ROLE in photochemical SMOG formation
Photochemical smog is an OXIDIZING agent in character
Photochemical smog is formed through photochemical REACTION involving solar energy
Photochemical smog does not cause irritation in eyes and throat

Solution :Photochemical smog does not cause irritation in nose eyes and throat.
Discussion
14087.

Which of the following species has maximum number of unpaired electrons?

Answer»

<P>`NA(Z=11)`
`CL(z=17)`
`P(Z=15)`
O(Z=8)

ANSWER :A
Discussion
14088.

The solubility of BaSO_4 will be almost same in-

Answer»

`0.1(M)H_2SO_4`
`0.1(M)Ba(OH)_2`
`0.1(M)Ba(NO_3)_2`
`0.2(M)HCL`

ANSWER :A::B::C
Discussion
14089.

When conc. H_(2)SO_(4) is added to charcoal

Answer»

CO and `SO_(2)` are evolved
Water gas is FORMED
`CO_(2)` and `SO_(2)` are evolved
There is no reaction

Answer :C
Discussion
14090.

The volume strength of 1.5 NH_(2)O solution is

Answer»

`4.8`
`8.4`
`3.0`
`8.0`

ANSWER :B
Discussion
14091.

The vapour pressure of water at room temperature is 23.8 mm Hg. The vapour pressure of an aqueous solution of sucrose with mole fraction 0.1 is equal to :

Answer»

23.9 MM HG
24.2 mm Hg
21.42 mm Hg
31.44 mm Hg

ANSWER :C
Discussion
14092.

The sum of the number of neutrons and proton in the radio isotope of hydrogen is

Answer»

6
5
4
3

Solution :Tritium `(._(1)H^(3))` consist of 1 PROTON and 2 NEUTRONS.
Discussion
14093.

What are artificial sweetners ? Saccharin, an artificial sweetner is used by whom ? How many times it is more sweeter than sugar ?

Answer»

Solution :The sweetners are the substances which PROVIDE sweet taste to the food and provide colours.
Saccharin is an ARTIFICIAL sweeter . It is used by diabetic PATIENTS and by those people whose need to control INTAKE of colours. It is 550 times sweeter than sugar.
Discussion
14094.

The vapour pressure of water at 20^@Cis 17.5 mmHg. Calculate mass of water per litre of air at 20^@Cand 45% relative humidity.

Answer»

SOLUTION : Relative humidity is the ratio of the partial PRESSURE of water in AIR at a given TEMPERATURE to the vapour pressure of water at that temperature.
7.8 mg
Discussion
14095.

What is Formalin solution?

Answer»

SOLUTION :40% AQUEOUS solution of FORMALDEHYDE .
Discussion
14096.

What role does the molecular interaction play in a solution of alcohol and water ?

Answer»

SOLUTION : There is strong intramolecular hydrogen bonding in alcohol molecules as well as water moleculesseparately. On MIXING, intermolecular hydrogen bonding between alcohol and water molecules is comparatively WEAK. Hence, they show positive deviations from ideal behaviour. As a result, the solution will have HIGHER vapour pressure and lower boiling point than that of water andalcohol.
Discussion
14097.

When 1 L of CO_(2) is heated with graphite, the volume of the gases collected is 1.5L . Calculate the number of moles of CO produced at STP:

Answer»

`(1)/(11.2)`
`(28)/(22.4)`
`(1)/(22.4)`
`(14)/(22.4)`

Solution :`CO_(2)(g)+C(s)rarr2CO(g)`
`1-x 2x`
TOTAL volume `=1-x+2x=1+x=1.5`
x=0.5L
`therefore` Volume of `CO=2xx0.5=1L`
Number of moles of `CO=(1)/(22.4)`
Discussion
14098.

What is the mass per cent of oxygen in Al_(2)(SO_(4))_(3).18H_(2)O? The molar mass of this substance is 666.43 g/mol:

Answer»

`9.60`
28.8
43.2
72

Answer :D
Discussion
14099.

Which of the following can act both as Bronsted acid and Bronsted base

Answer»

`Cl^(-)`
`HCO_(3)^(-)`
`H_(3)O^(+)`
`OH^(-)`

SOLUTION :Those substance which accept the proton are called BRONSTED base and which DONATE the proton are called Bronsted acid.
`HCO_(3)^(-) + H^(+) hArr H_(2)CO_(3)` Bronsted base.
`HCO_(3)^(-) hArr H^(+) + CO_(3)^(--)` Bronsted acid.
Discussion
14100.

What are the constituents of starch ?

Answer»

SOLUTION :The CONSTITUENTS of STARCH are : AMYLASE and AMYLOPECTIN.
Discussion