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22901.

Which of the following gas is used in oxyacetylene welding

Answer»

`O_2`
`N_2`
`NH_3`
`CO_2`

ANSWER :A
Discussion
22902.

Which of the following will be products of following reaction ?

Answer»




SOLUTION :It is a PROTECTION of CARBONYL GROUP.
Discussion
22903.

Write one chemical equation to show that SO_2 acts as areducing agent.

Answer»

SOLUTION :`SO_2` REDUCES `KMnO_4` to `MnSO_4`
`2KMnO_4 + 2H_2O + 5SO_2 RARR K_2SO_4 + 2MnSO_4 + 2H_2SO_4`
Discussion
22904.

Which of the following haldies has theleast dipole moment?

Answer»

`1,2-` Dichlorobenzane
Dichloromethane4
Trichloromethane
Etyl chlororide

Solution :
`MU` ORDER is: `(a) GT (d) gt (B) gt (C)`
Discussion
22905.

Write the chemical reactions associated with the 'borax bead test' of cobalt (II) oxide.

Answer»
Discussion
22906.

What are food preservatives?

Answer»

SOLUTION :For ANSWER SEE Section-A, Q. no.-11(i)
Discussion
22907.

Which of the following are less basic than H_(2)C=overset(* *)NH?

Answer»

`CH_(3)-C-=OVERSET(* *)N`

`CH_(3)-overset(O)overset(||)C-overset(* *)NH_(2)`

SOLUTION :
Discussion
22908.

Write the overall reaction that occurs during use (discharging) of nickel- cadmium cell. Is it a primary or a secondary cell? Mention its one merit over the lead storage cell.

Answer»

Solution :(i) Nickel-cadmium storage cell: It is another rechargeable cell. It consists of cadmium anode and the CATHODE is made of a metal grid containing nickel (IV) oxide. These are immersed in KOH solution. The overall reactions occuring:
Anode:
`Cd(s)+2OH^(-) (aq) to Cd(OH)_2(s)+2e^(-)`
Cathode:
`NiO_2(s)+2H_2O(l)+2e^(-)to NI(OH)_2(s)+2OH^(-) (aq)`
Net reaction
`Cd(s)+NiO_2(s)+2H_2O(l)to Cd(OH)_2(s)+Ni(OH)_2(s)`
discharging Ni-Cd cell is :
`Cd(s)+2NI(OH)_3(s)to CdO(s)+2Ni(OH)_2(s)+H_2O(l)`
(ii) Primary/Secondary: It is a secondary cell.
(iii) Merit over lead storage cell: As is evident, there are no gaseous products, the products formed. adhere to the electrodes and can be reconverted by recharging process.
Discussion
22909.

Which of the following gives a tertiary alcohol when treated with Grignard reagent ?

Answer»

`H-OVERSET(O)overset("||")C-H`
`overset("O")overset("||")(CH_(3)-C-H)`
`overset("O")overset("||")(CH_(3)-C-CH_(3))`
NONE of these

SOLUTION :
Discussion
22910.

What happens when a Cu rod is dipped in Fe_(2)SO_(4) solution ?

Answer»

FE PPT.
CU ppt.
No reaction
None of the above

ANSWER :C
Discussion
22911.

The work of catalyst depends on

Answer»

weight
concentration
VOLUME of PARTICLES
Solubility

Solution :volume of particles
Discussion
22912.

Which one of the following given d-block elements has the lowest atomic radii?

Answer»

Cu
Ti
Sc
Co

Answer :D
Discussion
22913.

Which one has the highest boiling point ?

Answer»

He
Ne
Kr
Xe

Answer :D
Discussion
22914.

Whatare hormones ? Mentiontheir function. Namesome hormones.

Answer»


Solution :(i) Hormonesare ORGANIC compounds ( EG. Peptide ora steroid) that is secreted byendocrineglands . It is an intercellular signallingmoleculeand induces a physiologicalresponse.Hormones maintainblood PRESSURE , blood volume andelectrolyte balance, EMBRYOGENESIS,hunger eatingbehaviourand digestion .
(ii) The majorendogrineglandsare thepitutiary , pineal , thymusthyroid , adernalglandsand PANCREASE. In additionalmen proudces hormones in theirtestes and women produceshormones in their ovary .
Discussion
22915.

What are interstitial compounds?

Answer»

Solution :(i) An interstitial compound or alloy is a compound that is formed when small atoms like hydrogen, boron, carbon or nitrogen are trapped in the interstitial HOLES in a metal lattice.
(ii) They are usually non-stoichiometric compounds.
(iii) Transition metals form a number of interstitial compounds such as `Tic, ZrH_(1.92), Mn_(4)N` etc.
(iv) The elements that occupy the metal lattice PROVIDE them new properties.
1. They are hard and show electrical and thermal conductivity
2. They have high melting points HIGHER than those of pure metals
3. Transition metal hydrides are USED as powerful reducing agents
4. Metallic carbides are chemically inert.
Discussion
22916.

What is calcination?

Answer»

SOLUTION :Calcination is a PROCESS of HEATING of the concentrated ore below its melting point with limited SUPPLY of ir , or in the absence of air.
Discussion
22917.

Why are adsorbate particles attracted and retained on the surface of adsorbent ?

Answer»

SOLUTION :The unbalanced forced of the ADSORBENT are responsible for ATTRACTING adsorbate PARTICLES at adsorbent SURFACE .
Discussion
22918.

Which of the following form micellies in aqueous solution above critical concentration

Answer»

Glucose
UREA
Dodecyl trimethyl ammonium CHLORIDE
Pynidum chloride

ANSWER :C
Discussion
22919.

Which of the following liquid pairs shows a positive deviation from Raoults Law ?

Answer»

`H_2O -HCL`
`C_6H_6-CH_3OH`
`H_2O-HNO_3`
`CH_3COCH_3-CHCl_3`

ANSWER :B
Discussion
22920.

Which of the following enhances leathering property of soap?

Answer»

SODIUM carbonate
Sodium rosinate
Sodium stearate
Tri sodium phosphate

Answer :B
Discussion
22921.

Which of the following is a non electrolytic colloidal sol

Answer»

Starch
AgCl sol
Arsenic SULPHIDE sol
`Sb_(2)S_(3) sol`

Answer :A
Discussion
22922.

The vapour pressure of pure liquids A and B are 450 and 700 mm Hg respectively, at 350 K. Find out the composition of the liquid mixture if total vapour pressure is 600 mm Hg. Also find the composition of the vapour phase.

Answer»

SOLUTION :Composition of Liquid mixture :
Vapour pressure of pure liquid A `(p_(A)^(0))=450` mm
Vapour presure of pure liquid B `(p_(B)^(0))=450 mm`
Total vapour pressure of solution (P) = 600 mm
According to Roult.s law : `p = p_(A)^(0)chi_(A)+p_(B)^(0)chi_(B)`
`p=p_(A)^(0).chi_(A)+p_(B)^(0)(1-chi_(A))`
`p=450.chi_(A)+700(1-chi_(A))`
`600=450 chi_(A)+700-700 chi_(A)`
`600-700=-250 chi_(A)`
`chi_(A)=0.40`
So, mole fraction of B = 0.60
Composition of vapour PHASE :
`p_(A)=p_(A)^(0).chi_(A)=450xx0.40=180 mm`
`p_(B)=p_(B)^(0).chi_(B)=700xx0.60=420 mm`
Mole fraction of A in vapour `= (p_(A))/(p_(A)+p_(B))`
`= (180)/(180+420)=0.30`
So, mole fraction of B is = 0.70.
Discussion
22923.

When a chemical bond is formed, the energy of the system:

Answer»

INCREASES
decreases
does not change
SOMETIMES increases and sometimes decreases

Answer :B
Discussion
22924.

Which of the following amino acids is not optically active?

Answer»

Alanine
Glycine
Valine
Leucine

Answer :B
Discussion
22925.

Which of the following is an example of basic dye?

Answer»

Alizarine
Indigo
MALACHITE
Orange-I

Solution :
Malachite.
Discussion
22926.

Which of the following statement is /are correct-

Answer»


`CH_(3)CHO` REACTS with HCN to yield a racemic mixture
`CH_(3)-OVERSET(C_(2)H_(5))overset(|)underset(OH)underset(|)(C)-HandH-overset(C_(2)H_(5))overset(|)underset(CH_(3))underset(|)(C)-OH` are enantiomers
`CH_(3) - CH = NOH` exhibits geometrical isomerism

Solution :
Discussion
22927.

War gas is formed from

Answer»

`PH_(3)`
`C_(2)H_(2)`
`ZINC phosphate
Chloroform

Answer :D
Discussion
22928.

Write the structures of A, B, C and D in the following reactions :

Answer»

Solution :`underset("Acetic acid")underset()(CH_(3)COOH)OVERSET(PCl_(3))rarrunderset([A])underset("Acetyl chloride")underset()(CH_(3)COCl)overset(H_(2)//Pd//BaSO_(4))rarrunderset([B])underset("ACETALDEHYDE")underset()(CH_(3)CHO)overset(CH_(3)MgBr)underset(H_(3)O^(+))rarrunderset([C])underset("Isopropyl alcohol")underset()((CH_(3))_(2)CHOH)`
Discussion
22929.

Which of the following is a positively charged sol ?

Answer»

`FE(OH)_3`
`Sb_2S_3`
`TiO_2`
`As_2S_3`

ANSWER :A
Discussion
22930.

Write the Nernst equation.

Answer»

Solution :`E_("cell")=E_("cell")^(@)-(RT)/(NF)In([C]^(L)[D]^(m))/([A]^(x)[B]^(y))"(or)"`
`E_("cell")=E_("cell")^(@)-(2.303RT)/(nF)LOG""([C]^(l)[D]^(m))/([A]^(x)[B]^(y))`
Discussion
22931.

What mass of isobutylene is obtained from 37g of tertiary butyl alcohol by heating with20% H_2SO_4 at 363K if the yield is 65%:

Answer»

16g
18.2 g
20 g
22 g

Answer :B
Discussion
22932.

Which of the alkane is synthesised from single alkyl halide ?

Answer»




SOLUTION :
This ALKANE is SYNTHESISED from SINGLE ALKYLHALIDE.
Discussion
22933.

Which one of the following is correct

Answer»

A MINERAL connot be an ore
An ore cannot be a mineral
All minerals are ORES
All ore are minerals

Solution :All menerals are not SUITABLE for the EXTRACTION of metals commerically. Thus all ores are minerals, but all minerals are not ores.
Discussion
22934.

When it is used as a reducing agent, the equivalent weight of KHC_(2)O_(4).H_(2)C_(2)O_(4).2H_(2)O is

Answer»

the same as its MOLECULAR WEIGHT.
HALF of its molecular weight.
1/4 of its molecular weight.
1/8 of its molecular weight.

ANSWER :C
Discussion
22935.

When a standard solution of NaOH is left in air for a few hours:

Answer»

A PRECIPITATE will form
Stregnth will decrease
The CONCENTRATION of `NA^(+)` IONS will decreases
All are wrong

Answer :B
Discussion
22936.

Tyndall effect is observed in

Answer»

TRUE solution
Precipitate
Colloidal solution
Vapour

Answer :C
Discussion
22937.

Which are true for elastomers:

Answer»

These are synthetic POLYMERS
possessing elasticity
These possess very weak intermolecular FORCES
of attactions between polymer chains
Vulcanised RUBBER is an EXAMPLE of elastomer
All

Answer :D
Discussion
22938.

Which of the following is a three dimensional silicate

Answer»

MICA
Spodumene
ZEOLITE
None of these

Solution :radius ratio RANGE 0.732-0.99 signifies co-ordination number 8. In CSCL, co-ordination number ratio is 8:8
Discussion
22939.

Which of the following represents largest number of possible isomers?

Answer»

`[Ru(NH_3)_4 Cl_2]^+`
`[CO(en)_2Cl_2]^+`
`[Ni(CO)_4]`
`[Co(NH_3)_4Cl_2]^+`

ANSWER :B
Discussion
22940.

The statement that is not correct for periodic classification of elements is:

Answer»

1. The properties of elements are periodic functions of their atomic numbers
2. Non-metallic elements are leser in NUMBER than metallic elements
3. The first ionisation energies of elements along a PERIOD do not vary in regular manner with increase in atomic number.
4. For transition elements, the d- subshells are filled with elements monotonically with increase in atomic number.

Solution :No regular order. For example
`Li lt Be, Be gt B, B lt C, C lt N, N gtO, O lt F`
Discussion
22941.

When ammonia, is added to green aqueous solution of nickel (II) sulphate, the colour of the solution changes to blue violet. This is caused by:

Answer»


ANSWER :B
Discussion
22942.

Zn(s) + Cu^(2+)(aq) rarr Zn^(2+)(aq) + Cu(s) The cell representation for the above redox reaction is

Answer»

`CU(s)| Cu^(2+)(aq) || Zn^(2+)(aq) | Zn(s)`
`Zn(s) | Zn^(2+)(aq) || Cu^(2+)(aq) | Cu(s)`
`Cu(s) | Cu^(2+)(aq) || Zn(s) | Zn^(2+)(aq)`
`Zn(s)|Zn^(2+)(aq) || Cu(s) | Cu^(2+)(aq)`

Answer :B
Discussion
22943.

Which of the following monosaccharides is a pentose

Answer»

GLUCOSE
FRUTOSE
Ribose
Galactose 

Answer :C
Discussion
22944.

Which of the follwing represents the decreasing order of K_(a) values ?

Answer»

`(ii)gt(i)gt(iii)gt(IV)`
`(ii)gt(iii)gt(i)gt(iv)`
`(i)gt(ii)gt(iii)gt(iv)`
`(ii)gt(iv)gt(i)gt(iii)`

Solution :In a given structures -
After releasing `H^(+)` from (ii) group , it forms a more STABLE RESONATING structure of carboxylate ion . In case of (i), the anion formed after release of `H^(+)` is more stable due to presence of `e^(-)` withdrawing `NO_(2)` in benzene ring . In(iii), phenoxide ion formed after release of `H^(+)` is more stable in comparison to acetylide ion of group (iv) which is formed after releasing `H^(+)` fromfrom (iv)so ACIDIC ORDER or `K_(a)` is
`(ii)gt(i)gt(iii)gt(iv)`
Discussion
22945.

Which of the following are the characteristics of chemisorptin ? 1. High heat of adsorption 2. Irreversibility 3. Low activation energy Select the correct answer using the code given below :

Answer»

1 and 2 only
1 and 3 only
2 and 3 only
1, 2 and 3

Solution :CHEMISORPTION has high HEAT of adsorption and is irreversible. It has high activation energy.
Discussion
22946.

Which of the following elementsis not found in amino acids ?

Answer»

OXYGEN
NITROGEN
Sulphur
PHOSPHORUS

SOLUTION :Phosphorus
Discussion
22947.

Thermodynamicis concerned with:

Answer»

Total ENERGY of a system
Energy CHANGES in a system
Rate of CHEMICAL CHANGE
Mass change in nuclear reactions

Answer :B
Discussion
22948.

Which of the following is reversible sol ?

Answer»

Fog
GELATIN 
Cellulose
Whitening of EGG 

SOLUTION :Gelatin
Discussion
22949.

Which alkyl halide from the following pairs would you expect to react more rapidly by S_(N^(2)) mechanism? .

Answer»

Solution :If the leaving group is the same in different isomers of a particular molecular formula, the reactivity of the isomers towards `S_(N^(2))` mechanism decrases with the increase in steric hindrance. In the light of above, the reactivity order in different cases is:
(i). `CH_(3)CH_(2)CH_(2)CH_(2)Br` is a primary alkyl HALIDE `(1^(@))`. it is more reactive than the other isomer which is a secondary `(2^(@))` alkyl halide becausae less steric hindrance is caused by primary alkyl group as COMPARED to secondary alkyl group.
(ii). `CH_(3)CH_(2)underset(Br)underset(|)(C)HCH_(3)` is a secondary alkyl halide `(2^(@))`. it is more reactive than the other isomer which is a tertiary alkyl halide `(3^(@))` the explanation is the same.
(III). Here both the isomers are primary alkyl halides `(1^(@))`. However, the isomer with `CH_(3)` group at `C_(2)` atom exerts more steric hindrance to the attacking nucleophile at `C_(1)` atom as compared TOT he other isomer in which a `CH_(3)` group is attached to `C_(3)` atom. it is , therefore, less reactive.
.
Discussion
22950.

Which is used for sterilization of water in water supply system of cities

Answer»

Chlorine
Sulphurdioxide
Potassium permanganate
DDT

Answer :A
Discussion