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11051.

Which of the following compound cannot liberate CO_(2) when treated with NaHCO_(3)

Answer»


`CH_(3)CO_(2)H`
`HCO_(2)H`

Answer :D
Discussion
11052.

Write the IUPAC names of the following coordination compounds :

Answer»

SOLUTION :
Discussion
11053.

Vitamin B takes part in

Answer»

INCREASE in BLOOD pressure
decrease in blood pressure
activating BONE marrow
maturation of RBC's

Answer :D
Discussion
11054.

Which of the following complex(es) is paramagnetic as well as low spin ?

Answer»

`[CR(CN)_(6)]^(4-)`
`[NI(NH_(3))_(6)]^(2+)`
`[Fe(CN)_(6)]^(4-)`
`[Cr(NH_(3))_(6)]^(2+)`

Answer :A
Discussion
11055.

Whichof medium changethe directiveinfluenceof NH_(2)in nitrationreactionof aniline ?

Answer»

STRONGLY BAISC
Stronglyacidic
Neutral
Weaklyacidic

SOLUTION :Strongaicdfic mediumchangethe directiveinfluenceof `-NH_(2)`groupandgivesunexpectedlym-nitro aniline .
Discussion
11056.

What type of a substances is Mno ?

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SOLUTION :Anti-ferromagnetic
Discussion
11057.

Which of the following electrons should have the highest value of ionisation energy (for the same value of the principal quantum number)

Answer»

s
p
d
f

Solution :s-electrons are strongly bonded to the NUCLEUS. So large AMOUNT of energy is REQUIRED to remove an `e^(-)`.
Discussion
11058.

Which of the following is an antiseptic?0.2% phenol, 1% phenol

Answer»

Solution :0.2% phenol ACTS as an ANTISEPTIC while 1% phenol acts as a DISINFECTANT
Discussion
11059.

The half cell reactions with their oxidation potentials are (a) Pb(s)-2e^(-)toPb^(2+)(aq),E_("oxi")^(@)=+0.13V (b) Ag(s)-e^(-)toAg^(+)(aq),E_("oxi")^(@)= -0.80V Write the cell reaction and calculate its emf.

Answer»


ANSWER :`PB(s)+2AG^(+)(AQ)toPb^(2+)(aq)+2Ag(s):EMF=0.93V`
Discussion
11060.

When initial concentration of a reactant is doubled in a reaction , its half-life period is not effected . The order of the reaction is

Answer»

First
Second
More than ZERO but LESS than first
Zero

Solution :`t_(1//2) = (0.6932)/(K)`
HALF life of first order REACTION is independent on initial CONC., of reactant
Discussion
11061.

Which of the following compound(s) is /are planar about nitrogen?

Answer»

`N(SiH_(3))_(3)`
`N(SiH_(3))_(2)(BF_(2))`
`N(BF_(2))_(3)`
`overset(..)(N)(CH_(3))_(3)`

ANSWER :A::B::C
Discussion
11062.

Which two substances are used in preparing iodised salt ?

Answer»

`KlO_3` and`I_2`
KI and `I_2`
`KIO_3` and KI
HI and KI

Solution :IODISED SALT contains Kl. (0.5 PER KG of NaCl)
Discussion
11063.

What type of linkages hold together monomers of DNA?

Answer»

SOLUTION :The DNA DOUBLE helix or duplex is held together by two forces
(i) Hydrogen bonding between COMPLEMENTARY BASE pairs
(II) Base-stacking interactions.The complementary between the DNA strands is attributable to the hydrogen bonding between base pairs but the base stacking interactions are largely non-specific, make the major contribution to the stability of the double helix
Discussion
11064.

The solubility porduct of CaSO_4 is 6.4 xx 10^-5. The solubbility of CaSO_4 is:

Answer»

`8XX10^(-3)`M
`8xx10^(-6)`M
`8xx10^(-10)`M
`1.6xx10^(-3)`M

Answer :A
Discussion
11065.

Weakest acid among the following is _______

Answer»

ACETIC acid
phenol
water
acetylene

Answer :D
Discussion
11066.

Which of the following nittates are water soluble ?

Answer»

`NaNO_(3)`
`AgNO_(3)`
`HG(NO_(3))_(2)`
`LiNO_(3)`

Answer :a,b,c,d
Discussion
11067.

Tranquilizers are used to relieve

Answer»

unconsciousnes
stress
acidity
pain

Answer :B
Discussion
11068.

When Lassiange extract of Methylamine react with FeSO_(4)//"dilute" H_(2)SO_(4) what happened ?

Answer»


SOLUTION :N//A
Discussion
11069.

The system in which exchange of both matter and energy with surroundings takes place is known as_____.

Answer»


ANSWER :OPEN SYSTEM
Discussion
11070.

Which element out of the following He, Ar, Kr and Xe forms least number of compounds ?

Answer»

`AR`
`KR`
`XE`
`He.`

ANSWER :D
Discussion
11071.

What type of cell is a lead storage battery? Write the anode and the cathode reactions and the overall cell reaction occurring in the use of a lead storage battery?

Answer»

SOLUTION :LEAD storage battery is a secondary cell.
The cell reactions when the battery is in use are GIVEN below:
Anode:
`Pb(s)+SO_4^(2-) (aq) to PbSO_4(s)+2e^(-)`
Cathode:
`PbO_2(s)+SO_4^(2-) (aq)+4H^(+) (aq) +2e^(-) to PbSo_4(s)+2H_2O(l)`
i.e., OVERALL cell reaction consisting of cathode and anode reactions is:
`Pb(s)+PbO_2(s)+2H_2SO_4(aq)to2PbSO_4(s)+2H_2O(l)`
While, charging the battery the electrode reactions are reverse of those that occur during DISCHARGE.
Discussion
11072.

Which statement is incorrect in the case of acetaldehyde and acetone:

Answer»

Both REACT with HYDROXYLAMINE to from oximes
Both react with sodium bisulfite to form addition product.
Both REDUCE ammoniacal silver nitrate to silver
Both react with hydrazine to form hydrazones.

Answer :C
Discussion
11073.

Which explosive substance is obrained when proportion of dichlorine gas is more in the reaction with ammonia gas ?

Answer»

Nitrogen(II) oxide
Ammonium chloride
Nitrogen trichloride
Ammonium chloride and dinitrogen GAS

ANSWER :C
Discussion
11074.

The species among the following, which can act as an acid and a base is

Answer»

`HSO_(4)^(-)`
`SO_(4)^(2-)`
`H_(3)O^(+)`
`Cl^(-)`

Solution :The SPECIES which cab accept as well as donate `H^(+)` can act both as an ACID and a base.
`underset("base")(HSO_(4)^(-)) + H^(+) hArr H_(2)SO_(4)`.
`underset("acid")(HSO_(4)^(-) hArr SO_(4)^(2-) + H^(+)`.
Discussion
11075.

Which one of the following is employed as antihistamine ?

Answer»

Chloramphenicol
Diphenylhydramine
Norethindrone
Omeprazole

Answer :B
Discussion
11076.

Which of the following process is used in the extractive metallurgy of Mg?

Answer»

FUSED SALT ELECTROLYSIS
Self-reduction
Aqueous SOLUTION electrolysis
Thermite reduction

Answer :A
Discussion
11077.

The test for aniline is

Answer»

FEHLING's test
Ferric CHLORIDE test
Bromination test
Riemer Tiemann test

Answer :C
Discussion
11078.

What is natural rubber : Explain the structure of natural rubber.

Answer»

SOLUTION :Natural rubberis CONSIDERED as a linear 1, 4 Polymer of isoprene (2-methyl-1, 3-butadiene). In this polymer, the residual DOUBLE bonds are located between `C_(2)andC_(3)` is isoprene UNITS in the polymer. All these double bonds have cis-configuration.
Discussion
11079.

Which of the following is the correct method of preparation of methyl fluoride?

Answer»

`CH_(4)+Hfto`
`CH_(3)OH+Hfto`
`CH_(4)+F_(2)to`
`CH_(3)Br+AgFto`

Solution :`CH_(3)Br+AgF to CH_(3)F+AgBr` (Stuarts reaction).
Discussion
11080.

When RNA is hydrolysed, there is no relationship among the quantities of different bases obtained. What does this fact suggest about the structure of RNA ?

Answer»

Solution :This can be explained in terms of single strand structure of RNA, A DNA MOLECULE has two strands in which the FOUR complementary bases pair each other, i.e., cytosine (C) always pairs with guanine (G) while THYMINE (T) always pairs with adenine (T). Therefore, when a DNA molecule is hydrolysed, the molar amounts of cytosine is always equal to that of guanine and that of adenine is always equal to that of thymine. In RNA, there is no relationship between the quantities of four bases (C, G A and U) obtained, that is the base pairing principle is not followed. Therefore, unlike DNA, RNA has a single strand.
Discussion
11081.

Which of the following is the heaviest metal ?

Answer»

U
Ra
Pb
Hg

Answer :A
Discussion
11082.

What is the net workdone (in calories)by 1 mole of monatomicidealgas in aprocess described by1, 2,3,4 in givenV-T graph .Use :R = 2 cal //"moleK"ln 2= 0.7

Answer»

`- 600 CAL`
`- 660 cal`
` + 660 cal`
` + 600 cal`

Solution :`W_(12) = - nRT In (V_(2))/(V_(1))= - 420cal `
`W_(23) = 0 P DELTAV =- nRDeltaT = -600 cal `
`W_(34) = - 1 xx 2 xx 600 xx In 4 = 1680`
`W= 6600 cal ("i.e. work is done on the gas ")`
work doneby thegas = -660 cal
Discussion
11083.

Which of the following statements are correct about the reaction intermediate ?

Answer»

Intermediate (iii) is UNSTABLE because in this carbon is attached to 5 atoms.
Intermediate (iii) is unstable because carbon atom is `sp^(2)` hybridised.
Intermediate (iii) is stable because carbon atom is `sp^(2)` hybridised.
Intermediate (iii) is LESS stable than the REACTANT (II).

Answer :A::D
Discussion
11084.

Whenalkylamineare preparedby theactionof NH_(3)onalkylhalidethe excessiveuse of NH_(3)

Answer»

suppressestheformationof otheramines
INCREASES THEFORMATIONOF otheramines
does notaffectthe REACTION
arrestthe reaction

ANSWER :A
Discussion
11085.

There is a large difference in the boiling points of butanal and butan - 1 - ol due to

Answer»

INTERMOLECULAR hydrogen BONDING in butan -1-ol
intramolecular hydrogen bonding in butanal
HIGHER molecular MASS of butan-1-ol
resonance shown by butanal .

ANSWER :A
Discussion
11086.

Which of the following is most suitable method for removing the traces of water from ethanol ?

Answer»

Heating with Na METAL
`Passing dry HCL through it
Distilling it with CaO
Reacting with Mg

Answer :C
Discussion
11087.

Which of these compounds is expected to be optically active at room temperature?

Answer»




ANSWER :D
Discussion
11088.

Which of the following set of species are non-planar as well as d_(z^(2)) orbital used in hybridisation ?

Answer»

`[Co(NH_(3))_(6)]Cl_(3),[PtCl_(4)]^(2-),[Ni(CO)_(4)]`
`[Ni(CO_(4))_(6)],Fe(CO)_(5),XeO_(3)F_(2)`
`XeO_(3)F_(2),PCl_(5),Ni(CO)_(4),`
`[Co(NH_(3))_(6)]Cl_(3), XeO_(3)F_(2), Fe(CO)_(5)`

Answer :D
Discussion
11089.

Which one is not the chain-growth polymer?

Answer»

NATURAL rubber
Polythene
Polypropylene
Terylene

Answer :D
Discussion
11090.

The solubility of A_2X_3 is y mol dm^(-3) its solubility product is

Answer»

`6y^4`
`64y^4`
`36y^5`
`108y^5`

ANSWER :D
Discussion
11091.

What are crystalline solid ? Give example.

Answer»

Solution :A CRYSTALLINE solid is one in which its constituents (atoms, ions or molecules) have an orderly arrangement extending over a long RANGE which has THREE DIMENSIONAL pattern. Example : NaCl.
Discussion
11092.

Unit of equilibrium constant K_pfor the reaction PCL_5(g)

Answer»

`ATM`
`atm^-1`
`atm^2`
`atm^-2`

ANSWER :3
Discussion
11093.

Which one of the following nitro compounds when reacted with nitrous acid followed by treatment with alkali produces blue colour

Answer»

2-methyl-2-nitropropane
2-methyl-1-nitropropane
2-nitropropane
NITROBENZENE

Solution :Nitro group attached to secondary carbon atom will give pseudo nitrol with `HNO_(2)` which on further treatment with alkali gives blue colour
`UNDERSET(CH_(3))underset(|)overset(CH_(3))overset(|)(HC)-NO_(2)overset(HONO)rarrH_(3)C-underset(NO)underset(|)overset(CH_(3))overset(|)(C)-NO_(2)overset(NaOH)rarr` Blue Colour
Discussion
11094.

The S.R.Ps of Cu^(2+) // Cu , Hg^(2+)//Hg and Zn^(2+)//Zn are respectively 0.34 V , 0.85 V and -0.76 V . The wrong statement is

Answer»

Cu REDUCES `Hg^(2+)`
ZN reduces `Cu^(2+)`
Hgreduces `Zn^(2+) `
Zn reduces both `Cu^(2+) and Hg^(2+)`

ANSWER :C
Discussion
11095.

When Brine solution is subjected to electrolysis the gases liberated at anode and at cathode are

Answer»

`H_(2)andCl_(2)`
`H_(2)andO_(2)`
`Cl_(2)andO_(2)`
`Cl_(2)andH_(2)`

ANSWER :D
Discussion
11096.

Which of the following is not a colligative property?

Answer»

DEPRESSION in freezing point
Elevation in BOILING point
Optical activity
Relative LOWERING in vapour pressure

Answer :C
Discussion
11097.

What are the monomers of the following? Nylon 6

Answer»

SOLUTION :CAPROLACTAM
Discussion
11098.

Whatvolume of hydrogenat NTP is needed to reduce 125 g of Mo O_(3) to the metal ?

Answer»


ANSWER :58.3 LITRES
Discussion
11099.

Which of the following cannot show linkage Isomerism :-

Answer»

`NO_(2)^(-)`
`SCN^("ϴ")`
`CN^("ϴ")`
`NH_(3)`

ANSWER :D
Discussion
11100.

Which are the correct uses of potassium dichromate from the following? (i) As an indicator in redox titration (ii) As a reagent in COD measurements (iii) As reducing agent in synthesis of organic compounds (iv) In leather industry

Answer»

(i)
(II) and (IV)
(i) and (III)
(i), (ii) and (iii)

ANSWER :B
Discussion