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17551.

Write the balanced equation for the reaction of aluminium carbide with water.

Answer»

Solution :`underset("Aluminium CARBIDE")(Al_(4)C_(3))+""12H_(2)O""rarr underset("Aluminimum hydroxide")(4AL(OH)_(3))+""underset("Methane")(3CH_(4))`
Discussion
17552.

Write the main reason for the stability of colloidal sol.

Answer»

SOLUTION :The main reason for STABILITY of colloidal SOL is that all colloidal PARTICLES in the sol carry the same charge. Hence, they REPEL each other and cannot coagulate.
Discussion
17553.

Which of the following is not correct regarding terylene

Answer»

STEP GROWTH POLYMER
SYNTHETIC fibre
Condensation polymer
THERMOSETTING plastic

Answer :D
Discussion
17554.

The tripeptide is written as Glycine - Alanine - Glycine. The correct structure of the tripeptide is

Answer»




SOLUTION :
Discussion
17555.

Write the reducing agents which reduce alkyl cyanides to primary amines.

Answer»

SOLUTION :`(I ) LiAIH_4 (ii) H_2 //PT orNi "CATALYST "(iii) Na//C_2 H_5 OH`
Discussion
17556.

Which of the following statementsis not true ?

Answer»

HOCl is a stronger acid than `HOBr`
HFIS a strongeracid than HCl
Among halide ions,iodine is the most powerfulreducing agent.
Fluorine is the only halogen that does not show a variable oxidation state

Solution :Due to strong H-F bond, `H^(+)` ions are not easily removed due to higher electronegativity (EN) of F Hence more bond dissociation ENERGY required.
Acidic nature `prop (1)/("Bond dissociation energy")`
So, HF is not a stronger acid than HCl.
Discussion
17557.

Two of the constituents of German silver are

Answer»

Ag
Fe
ZN
NI

Solution :GERMAN SILVER CU,Zn,Ni
Discussion
17558.

Which is not pi-bonded complex?

Answer»

Zeisc's salt
Ferrocene
Dibenzene chromium
TETRAETHYL lead

Solution :Tetraethyl lead `Pb(C_(2)H_(5))_(4)` is not `pi` bonded complex. It is `sigma` bonded organ ometallic COMPOUND.
Discussion
17559.

When an electric current is passed through a cell having an electrolyte, then the cations and anions move to their respective electrodes if the cathode is pulled out of the solution then

Answer»

Both CATIONS and anions will MOVE TOWARDS anode
cations will start moving towards anode while anions will stop moving
Anions will CONTINUE to move towards anode while cations will stop moving
Both cations and anions will STARTS moving randomly

Answer :D
Discussion
17560.

Which of the following order of stability of complex ion is Incorrect ?

Answer»

`[Fe(C_2 O_4)_3]^(3-) lt [Fe(H_2 O)_6]^(3+)`
`[Fe ("EDTA)]^(-) gt [Fe(H_2 O)_6]^(3+)`
`[Ni(en)_2 ]^(2+) gt [Ni(DMG)_2]`
`[Fe(CN)_6]^(3-) gt [Fe(CN)_6]^(4-)`

Solution :`[Co(NH_3)_6]Cl_3 OVERSET(AgNO_3)to `3 mole of AGCL
`[Co(NH_3)_5 Cl]Cl_2 overset(AgNO_3)to ` 2 mole of AgCl
`[Co(NH_3)_4 Cl_2] Cl overset(AgNO_3)to ` 1 mole of AgCl
Complexes are respectively `[Co(NH_3)_6 Cl_3,[Co(NH_3)_5 Cl]Cl_2 and [Co(NH_3)_4 Cl_2]Cl`
Discussion
17561.

Zinc metal is refined by:

Answer»

Crystallisation
Sublimeation
Heating ZINC to `100-150^@C`
Distillation

Answer :D
Discussion
17562.

Thymine is present in RNA but not in DNA.SAY TRUE/FALSE

Answer»


ANSWER :URACIL is PRESENT in RNA but not in DNA,
Discussion
17563.

Which of the following has Frenkel defects?

Answer»

SODIUM chloride
Graphite
Silver bromide
Diamond

Solution :AGBR EXHIBITS FRENKEL DEFECT.
Discussion
17564.

Which alloy is generally used inmaking bullets, shells and lighter flints? What is its composition ? With which other element it is generally alloyed and why ?

Answer»

SOLUTION :The alloy used in KNOWN as MISCHMETAL. For details REFER to art.
Discussion
17565.

Which of the following combinations can be used to synthesise ethanol?

Answer»

 `CH_(3)Mgl` and `CH_(3)COCH_(3)`
 `CH_(3)Mgl` and `C_(2)H_(5)OH`
 `CH_(3)Mgl` and `CH_(3)COOC_(2)H_(5)`
 `CH_(3)Mgl` and `HCOOC_(2)H_(5)`

SOLUTION :
Discussion
17566.

Which of the following statementsis correct ?

Answer»

OXIDATION number of oxygen in `K_(2)O` is + 1
The SPECIFIC CONDUCTANCE of an electrolyte solution DECREASES with increase in dilution
`Sn^(2+)` oxidises `Fe^(3+)`
`Zn|ZnSO_(4)` is reference electrode .

Solution :(a) O.N. of O = `-2` (c) `Fe^(3+)` oxidises `Sn^(2+)`
(d) `Zn |ZnSO_(4)` is not reference electrode .
Discussion
17567.

Which oxides is colourless and neutral

Answer»

`N_(2)O`
`N_(2)O_(3)`
`N_(2)O_(4)`
`N_2O_(4)`

SOLUTION :`N_(2)O` and `NO rArr` Colourless and Neutral gas
`N_(2)O_(3),N_(2)O_(4)` and `N_(2)O_(5) rArr ` ACIDIC
Discussion
17568.

Which of the following is(are) alloy(s) not containing copper?

Answer»

BELL METAL
Brass
STEEL
Duraluminium

Solution :Steel does not CONTAINS CU
Discussion
17569.

What may be the stable oxidation state of the transition element with the following d-electron configuration in the ground state of their atoms 3d^3, 3d^5, 3d^8, and 3d^4 ?

Answer»

SOLUTION :STABLE OXIDATION states:
`3d^3 ` : Chormium `(3d^3 4s^2)` : oxidation states +2, +3, + 4 and +5
`3d^5` : Manganese `(3d^5 4s^1)` : oxidation states +3, + 4, and +6.
`3d^5` : Manganese `(3d^5 4s^2)`: oxidation states (+2, + 4, + 6, + 7).
`3d^8` : Cobalt `(3d^7 4s^2)`: oxidation states + 2, + 3 (in complexes) (Co BELONGS to 9 group)
`3d^4` : such configuration does not exist in ground state .
Discussion
17570.

Which polymer is used in the manufacture by reacting it with

Answer»

Polypropene
Polyvinyl CHLORIDE
Bakelite
GLYPTAL

ANSWER :D
Discussion
17571.

Which is the addition polymer

Answer»

Nylon-66
Teflon
Polyester
PHBV

Answer :B
Discussion
17572.

Which factor is not effective in a reversible chemical reaction ?]

Answer»

Temperature
Pressure
CATALYST
Concentration 

SOLUTION :Catalyst
Discussion
17573.

Which of the following reactions will not give propane

Answer»

`CH_3CH_2CH_2Clunderset(H_2O)overset"Mg/ether"to `
`CH_3COClunderset(H_2O)overset(CH_3MgX)to`
`CH_3CH=CH_2underset(CH_3COOH)overset(B_2H_6)to`
`CH_3underset(OH)underset|CH-CH_3overset"P/HI"to`

SOLUTION :With calculated amount of GRIGNARD's REAGENT, ACETYLCHLORIDE forms ketones.
Discussion
17574.

What is the byproduct obtained in the Serpeck's process ?

Answer»

Oxygen
Ammonia
NITROGEN dioxide
Nitric oxide

Answer :B
Discussion
17575.

The strongest base from the following species is

Answer»

`NH^(2-)`
`OH^(-)`
`O^(2-)`
`S^(2-)`

Solution :`NH_(4)^(+)` is the weakest ACID. So its CONJUGATE BASE is strongest.
Discussion
17576.

Which of the following is a minor tranquilizer?

Answer»

HALOPERIDOL
clozapine
morphine
VALIUM

Solution : valium
Discussion
17577.

Which of the following reactions is an example of Wurtz reaction ?

Answer»

`RX+H_(2)OVERSET(NI,Al)rarrRH+HX`
`2RX+2Naoverset("ETHER")rarrR-R+2NaX`
`RX+KCNrarrRCN+KX`
`RX+Mgoverset("Ether")rarrRMgX`

ANSWER :B
Discussion
17578.

Which of the following are examples of fibrous proteins ?

Answer»

HAIR
Silk
ALBUMIN
Nails

Solution :Albumin
Discussion
17579.

Under identical conditions of temperature the density of a gas A is three times that of gas B while molecular mass of gas B while molecular mass of gas B is twice that of A. The ratio of pressure of A and B will be :

Answer»

6
1/6
2/3
3/2

Answer :A
Discussion
17580.

Whichof the followingis an aldohexose ?

Answer»

Sucrose
CELLULOSE
GLUCOSE
RAFFINOSE

ANSWER :C
Discussion
17581.

The rusting of iron is catalysed by:

Answer»

FE
`O_2`
ZN
`H^+`

ANSWER :D
Discussion
17582.

The volume of 0.1 M NaOH solution required to neutralise the solution produced by dissolving 1.1 g of P_4 O_6 in water is Y xx 100 . What is the value of Y ?

Answer»

Solution :`P_(4)O_(6)+6H_(2)O RARR 4H_(3)PO_3`
`(1.1gm)/(220)5xx10^3molrarr4xx5xx10^(-3)mol=2xx10^(-2)` mol
`H_(3)PO_(3)+2NaOHrarrNa_(2)HPO_3+2H_(2)O`
`2 xx 10 - 2mol 2 xx 2 xx 10^(-2) mol :. " moles of "NaOH = 4 xx10^(-2)=M_(NaOH)xxV_(LN2)`
`impliesV=(4xx10^(-2))/(M_(NaOH))=(4xx10^(-2))/(0.1)=0.4 ` LITER `implies V=400 ml = 4 xx 100 implies Y = 4`
Discussion
17583.

What amount ofCaO will be produced by 1 g of calcium ?

Answer»

Solution : `Ca to CaO`
APPLYING POAC for Ca atoms as Ca atomsare conserved,
MOLES of Ca atomsin the reactant
- moles of Ca atoms in the product
= moles of Ca atomsin Ca O `= 1 xx`moles of CaO
(`:.` 1 mole of CaO contains 1 mole of Ca atoms )
`("wt. of Ca")/(UNDERSET("(Rule 2)")("at. wt. of Ca"))=("wt. of CaO")/(underset("(Rule 1)")("mol. wt. of CaO"))`
`(1)/(40) = (wt.ofCaO)/(56), wt . of CaO = (56)/(40) = 1.4 g`
Discussion
17584.

What is the action of ammonia [NH_(3)] on benzoic acid? Write equation.

Answer»

Solution :BENZOIC acid reacts with AMMONIA to give ammonium benzoate. On further HEATING gives BENZAMIDE.
Discussion
17585.

Urea is converted into ammonia and carbon dioxide by the enzyme:

Answer»

diastase
urease
lipase
amylase

Answer :B
Discussion
17586.

Which of the following is used in the estimation of carbon monoxide?

Answer»

`ClO_2`
`BrO_2`
`I_2O_5`
`I_4O_9`

ANSWER :C
Discussion
17587.

What is the effect ofpressure on the boilling point of a liquid ?

Answer»

SOLUTION :Boiling POINT of a liquid INCREASES with increases of PRESSURE .
Discussion
17588.

Which of the following statement is true in the context of photoelectic effect?

Answer»

The kinetic energy of EJECTED electron is independent of the intensity of a radiation.
The NUMBER of photoelectrons ejected depends upon the intensity of the incident radiation.
The kinetic energy of the emitted electrons depends on the frequency of the incident radiation
All of these

Solution :`hv=hv_(0)+eV_(0), eV_(0)=hv-hv_(0)` or
`V_(0)=h/e v-h/e v_(0), slope_(1)=h/e`
Similarly, `hv=hv_(0)+K_(max)` or `K_(max)=hv-hv_(0),`
`"SLOPE"_(2)=h ("slope"_(2))/("slope"_(1))=h/(h//e)=e`
Discussion
17589.

Which of the following is not a consequence of green house effect

Answer»

Climatic CONDITIONS will be changed resulting in increase in temperature
PLANTS in warmar climates with adequate rain fall would grow faster
The incidence of infections disese is likely to increase
Malaria will be CONTROLLED as the mosuitoes will not SURVIVE

Answer :D
Discussion
17590.

Which of the following elements is a lanthanide (Rare-earth element) ?

Answer»

Cadmium
Californium
Cerium
Cesium

Solution :Cd is a d-block ELEMENT. CF is a actinide WHEREAS CS is a s-block element.
Discussion
17591.

What is peptisation? Give an example.

Answer»

Solution :(i) The dispersion of a precipitated material into colloidal solution by the action of an electrolyte in solution is termed as peptisation. (II) The electrolyte used is called a peptizing AGENT. Eg: SILVER chloride can be converted into a sol by ADDING hydrochloric acid. Precipitate `AgCl overset(HCl)(to)AgCl`COLLOID
Discussion
17592.

Which is/are oxirane(s) ?

Answer»




ANSWER :A::C::D
Discussion
17593.

Write Kohlrausch law and give its importance (applications).

Answer»

Solution :* Law: The law states that limiting molar conductivity of an electrolyte can be represented as the SUM of the individual contributions of the anion and cation of the electrolyte.
* USES :Using Kohlrausch law of independent MIGRATION of ions, it is possible to calculate `Lamda_(m)^(@)` for any electrolyte from the `lamda_(m)^(@)` of individual ions.
`Lamda_(m)^(@)=(v_(+)lamda_(m^(+))^(@)+v_(-)lamda_(m^(-))^(@))`
* Moreover, for weak electrolytes like acetic acid it is possible to determine the value of its dissociation constant once we know the `Lamda_(m)^(@) and Lamda_(m)` at a given CONCENTRATION c.
* `kappa_(a)=(calpha^(2))/(1-ALPHA)=(cLamda_(m)^(2))/(Lamda_(m)^(@)(Lamda_(m)^(@)-Lamda_(m)))`
* Degree of dissociation of weak electrolyte:
`(alpha)=(Lamda_(m))/(Lamda_(m)^(@))`.
Discussion
17594.

Which of the following is not characteristic of alcohols

Answer»

Lower ALCOHOLS are stronger and have bitter taste
Higher alcohols are stronger and have bitter taste
The BOILING POINTS of alcohols INCREASE with increasingmolecular mass
The lower alcohols are soluble in water

Solution :Higher alcohols are stronger and have bitter taste.
Discussion
17595.

Which among the following is not an antibiotic?

Answer»

Chloramphenicol
Oxytocin
Erythromycin
Tetracyclin

SOLUTION :Oxytocin is a hormone , which is released from POSTERIOR PITUITARY gland . It control the contractionof uterusafter child BIRTH and releases milk from the mammary glands.
Discussion
17596.

What are the factors which influence the adsorption of a gas on a solid?

Answer»

Solution :Factors affecting ADSORPTION of gases on solids are :
(i) Surface AREA of ADSORBENT (ii) NATURE of ADSORBATE (iii) Effect of temperature (iv) Effect of pressure.
Discussion
17597.

Which type of biomolecules have some structural similarity with synthetic polyamides ? What is this similarity?

Answer»

Solution :POLYAMIDES have STRUCTURAL REPEATATION of amide linkages which is similar to peptide BOND as present in polypeptide chains of proteins.
Discussion
17598.

Which of the following is a negatively charged bidentate ligand ?

Answer»

DIMETHYL glyoximato
CYANO
ETHYLENE DIAMINE
Acetato

Solution :
Discussion
17599.

The total number of valency for PO_4^(3-) ion is :

Answer»

32
16
28
30

Answer :A
Discussion
17600.

What will be the chief productg from the following reaction sequence ?

Answer»




ANSWER :D
Discussion