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12101.

What are P and Q.

Answer»

SOLUTION :
Discussion
12102.

Which statements is incorrect about complexes formed by the lanthanoid

Answer»

Hard donor ligands are favoured
High coordiantion number (more than six) are often observed
The 4f atomic orbitals do not play a significant part in metal-ligand bonding
Aque ions are typically 6-coordinate

Solution :The COORDINATION number for `[LN(H_(2)O)_(n)]^(+3)` in aqueous solution is THOUGHT to be 9 for the early lanthanoids and for the LATER, smaller members of the series.
Discussion
12103.

Which of the following statements are wrong ?

Answer»

Zeolites are hydrated aluminosilicates which can be used as such as shape-selective catalysts.
ENZYMES show MAXIMUM activity when pH is either very low or very high.
Enzymes show maximum activity at room temperature `(20-25^(@)C).`
Chemically, all enzymes are globular proteins.

Solution :(a) is wrong because zeolites are not used as such but are first heated in VACUUM so that water of hydeation is lost.
(b) is wrong because enzymes have maximum activity at pH of 7.4.
(c ) is wrong becaue ENZYME have maximum activity at `37^(@)C.`
Discussion
12104.

Vanadium metal is added to steel to impart strength. Its density is 5.96 g cm^(-3). In SI system it is equal to

Answer»

`5.96 kg//m^(-3)`
`5.96xx10^(2)kg//m^(3)`
`5.96xx10^(3)kg//m^(3)`
`59.6kg//m^(3)`

ANSWER :C
Discussion
12105.

Which of the following comments are true -

Answer»

ELECTROLYSIS of a dilute solution of `NaCl` RESULTS in formation `H_(2) and O_(2)` gases
electrolysis of a concentrated solution of `H_(2)SO_(4)`
produces `H_(2) and O_(2)` gases
electrolysis of MOLTEN `KHF_(2)` leads to the production of `F_(2)` GAS at anode

Answer :A::C::D
Discussion
12106.

Write the balanced chemical equation for the reaction of CI_(2) with hot and concentrated NaOH ? Is this reaction a disproportionation reaction ? Justify.

Answer»

Solution :`3 overset(0)(Cl_(2))+6NaOH(conc.)overset("Hot)rarr overset(-1)(5NaCl)+overset(+5)(NaClO_(3))+3H_(2)O`
This is an example of a disproportionation reaction because the oxidation STATE of CHLORINE decreases from zero in `Cl_(2)` to -1 in NaCl and increases from zero in `Cl_(2)` to +5 in `NaClO_(3)`.
Discussion
12107.

Which of the following compounds can show geometrical optical and conformational isomerism.

Answer»

`CL-CH=CH-CH_(3)`
`CH_(3)-C-=C-CH(Cl)-CH_(3)`

SOLUTION :
Discussion
12108.

Which of the following is an electrophile

Answer»

`H_2O`
`NH_3`
`AlCl_3`
`C_2H_5NH_2`

Solution :`AlCl_3` is an ELECTRON DEFICIENT compound. Hence, act as an ELECTROPHILE
Discussion
12109.

Write the strutures of the following compounds: (i). 2-Chloro-3-methylpentane (ii). 1-Chloro-4-ethycyclohexane (iii). 4-tert, butyl-4-iodoheptane (iv). 1,4-dibromobut-2-ene (v). 1-Bromo-4-ene butyl-2-methylbenzene.

Answer»

SOLUTION :
Discussion
12110.

Two gases A and B are filled in a container. The experimental rate law for the reaction between them, has been found to be Rate =k [A]^2[B]Predict the effect on the rate of the reaction when pressure is doubled :

Answer»

the RATE is doubled
the rate becomes four TIMES
the rate beomces six times
the rate becomes eight times

Solution :When pressure is doubled, CONCENTRATIONS are also doubled.
`Rate_1=k(P_A)^2(P_B)`
`Rate_2=k(2P_A)(2P_B)`
`:. (Rate_2)/(Rate_2)= (k(2P_A)^2(2P_B))/(k(P_A)^2(P_B))`
`=(2)^2xx 2= 8`
Discussion
12111.

Write the structure of 1-Bromo-4-chlorobut-2-ene.

Answer»

Solution :`Cl - overset(4)CH_(2) - overset(3)CH = overset(2)CH - overset(H)overset(1|)underset(H)underset(|) C - Br`
Discussion
12112.

Tubeless tyres are copolymers of isoprene and

Answer»

NEOPRENE
SILICONS
ISOBUTYLENE
PAN

Answer :C
Discussion
12113.

Which among the following is a tertiary amine?

Answer»

`(CH_3)_3-C-NH_2`


ANSWER :C
Discussion
12114.

Which is a mutual reduction reaction ? A) KMnO_(4)+O_(3) B) H_(2)O_(2)+O_(3) 3) Ag_(2)O+O_(3) D) KI+H_(2)O+O_(3)

Answer»

A,B
A,C
A,D
B,C

Answer :D
Discussion
12115.

When KBr is treated with conc. H_2SO_4 a reddish brown gas is evolved. The gas coming out is

Answer»

`NO_2`
`Br_2 + HBR`
`H_2O_2`
`Br_2`

ANSWER :D
Discussion
12116.

There was a medical check-up of teeth of a particular class in a school. It was found that some students had cavities in their teeth. The teacher asked them two questions. First, how many chocolates or sweets do they eat? Second, which toothpaste do they use for brushing their teeth, i.e., does it contain fluoride or not? After reading the above paragraph, answer the following questions : (a) What values are expressed by the teacher?

Answer»

SOLUTION :We should not eat too MANY CHOCOLATES or sweets as they DAMAGE our TEETH.
Discussion
12117.

Which of the following type of cubic lattices hasmaximum number of atoms per unit cell?

Answer»

SIMPLE cubic
body CENTRED cubic
face centred cubic
all have same

ANSWER :C
Discussion
12118.

The solution of starch formed by passing steam is called as

Answer»

malt
mash
wash
ABSOLUTE alcohol

Answer :B
Discussion
12119.

When 1-butyne is treated with excess of HBr, the expected product is

Answer»

1,2-dibromobutane
2,2-dibromobutane
1,1-dibromobutane
all of these.

Solution :`CH_3 UNDERSET("1-butyne")(CH_(2) C-=) CH + 2 HBr to underset(2-2-"dibromobutane")(CH_(3) CH_ 2- C Br_(2) - CH_(3))`
Discussion
12120.

What is the charge on the complex [Cr(C_(2)O_(4))_(2)(H_(2)O)_(2)] formed by Cr(III)

Answer»

`+3`
`+1`
`+2`
`-1`

ANSWER :D
Discussion
12121.

What is the IUPAC name of [Co(CO_(3))(NH_(3))_(4)]Cl ?

Answer»

Carbonato tetraammine cobalt `(III)` CHLORIDE
Tetraamminecarbantaocbalt `(III)` chloride
Carbonato TETRA ammonium cobaltate `(III)`
Carbonato tetraammine cobaltate `(II)`

Answer :A::B::C::D
Discussion
12122.

There was a medical check-up of teeth of a particular class in a school. It was found that some students had cavities in their teeth. The teacher asked them two questions. First, how many chocolates or sweets do they eat? Second, which toothpaste do they use for brushing their teeth, i.e., does it contain fluoride or not? After reading the above paragraph, answer the following questions : (c) How does fluoride protect our teeth ?

Answer»

SOLUTION :The `F^(-)` ions make the enamel on the teeth MUCH harder by CONVERTING hydroxypatite, `[3Ca_(3)(PO_(4))_(2),Ca(OH)_(2)]`, the enamel on the surface of teeth into much harder FLUORAPATITE `[3Ca_(3)(PO_(4))_(2).CaF_(2)]`.
Discussion
12123.

What type of colloid is formed when a solid is dispersion in a liquid ? Give an example.

Answer»
Discussion
12124.

There was a medical check-up of teeth of a particular class in a school. It was found that some students had cavities in their teeth. The teacher asked them two questions. First, how many chocolates or sweets do they eat? Second, which toothpaste do they use for brushing their teeth, i.e., does it contain fluoride or not? After reading the above paragraph, answer the following questions : (b) What is the limiting value of the fluoride that should be present in the toothpaste? What happens if this limit is exceeded?

Answer»

Solution :The FLUORIDE present in the paste should be UPTO 1 ppm. If if it exceeds 1 ppm and is present upto 1.5 ppm, the TEETH become mottled. If it exceeds 1.5 ppm, it BECOMES a poison (USED for rats as NaF).
Discussion
12125.

Whichof thefollowingis Gattermann reaction ?

Answer»




ANSWER :B
Discussion
12126.

The salt which is least likely to be found in minerals is :

Answer»

SULPHATE
Acetate
Chloride
Sulphide

Answer :B
Discussion
12127.

Which one of the following is most reactive for E_1 reaction

Answer»

<BR>`C_6H_5-OVERSET(Br)overset(|)(CH)-CH_3`
`CH_2=CH-overset(Br)overset(|)(CH)-CH_3`
`CH_3=CH-UNDERSET(CH_3)underset(|)overset(Br)overset(|)C-CH_3`

ANSWER :A
Discussion
12128.

What happens to change in entropy when water is converted into ice ?

Answer»

SOLUTION :CHANGE in ENTROPY BECOME NEGATIVE.
Discussion
12129.

Which of the following molecules would diffuse through a cell membrane

Answer»

Frctose
GLYCOGEN
HAEMOGLOBIN
CATALASE

ANSWER :A
Discussion
12130.

Which of the following represents the polar head of the molecule of soap?

Answer»

`-CH_(3)`
`-CH_(2)-CH_(2)-CH_(2)-`
`-Coverset(O)OVERSET(||)C-Ona`
None of these

Answer :C
Discussion
12131.

What is the unit of rate constant k when the order of reaction is 0.5 ?

Answer»

`sqrtsec^(-1)`
`[L mol^(-1)]^(1//2)SEC^(-1)`
`[mol L^(-1)]^(1//2) sec^(-1)`
`sec^(-1)`

SOLUTION :Unit of `k=[(mol)/L]^(1-n) sec^(-1)`
where n = ORDEROF reaction
`:.` Unit of k when n is 0.5
`[(mol)/L]^(1-0.5)sec^(-1)[(mol)/L]^(-0.5)sec^(-1)=[mol L^(-1)]^(1//2). S^(-1)`
Discussion
12132.

The wrong statement amongst the following regarding HCl is

Answer»

It is used in the MANUFACTURE of glucose from corn starch
It is used for extractin GLUE from bones
It is used in the preparation of phosgene
It is used in PURIFYING BONE black

Answer :C
Discussion
12133.

The value of n in the following half equation is MnO_4^(-) + 2H_2O + ne rarrMnO_2 + 4OH^(-)

Answer»

3
5
4
6

Answer :A
Discussion
12134.

The substance(s) which undergo sublimation "is"//"are"

Answer»

`AICI_(3)`
`HgCl_(2)`
NACI
`CaCl_(2)`

Solution :`AlCl_(3), HgCl_(2)` under go sublination
Discussion
12135.

Under what condition of temperature and pressure the formation of atomic hydrogen from molecular hydrogen will be favoured most :

Answer»

HIGH temperature and high PRESSURE
LOW temperature and low pressure
High temperature and low pressure
Low temperature and high pressure

ANSWER :C
Discussion
12136.

Which of the following compounds will react with methylmagnesium iodide followed by acid-hydrolysis to give ethyl alcohol ?

Answer»

Ethylene
Acetaldehyde
Formaldehyde
Acetone

Answer :C
Discussion
12137.

Zn amalgam is prepared by electrolysis of aqueous ZnCl_(2) using Hg cathode (9gm) How much current is to be passed through ZnCl_(2) solution for 1000 seconds to prepare a Zn amalgam with 25% Zn by wt. (Zn=65.4)

Answer»

5.6 amp
7.2 amp
8.85 amp
11.2 amp

Solution :LET x gm of Zn deposit on 9 gm of HG
`%` of Zn in amalgam `=(x)/(9+x)xx100=25`
`thereforex=3gm`
EQ of `Zn=(3xx2)/(65.4)`
CURRENT `=(6)/(65.4)xx(96500)/(1000)=8.86amp`
Discussion
12138.

Which institution has replaced the planning commission?

Answer»

SOLUTION :NITI AYOG
Discussion
12139.

Write the reaction when glucose is heated with excess of HI.

Answer»

SOLUTION :The reaction is given as under :`CH_(2)OH(CHOH_(4))CHO+HI ("excess") overset(Delta)to CH_(3)CH_(3)underset("n - hexane")(CH_(2)CH_(2)CH_(3))`
Discussion
12140.

Write down the number of 3d electrons in each of the following ions : Ti^(2+),V^(2+),Cr^(3+),Mn^(2+),Fe^(2+),Fe^(3+),Co^(2+),Ni^(2+) and Cu^(2+) Indicate how would you expect the five 3d orbitals to be occupied for these hydrated ions (octahedral).

Answer»

SOLUTION :
Discussion
12141.

Which one of the following is formed when benzaldehyde reacts with acetaldehyde ?

Answer»

Cinnamic acid
CINNAMALDEHYDE
BENZYLIDENE acetone
3 – HYDROXY PROPANAL

SOLUTION :Cinnamaldehyde
Discussion
12142.

What are antiseptics ?

Answer»

Solution :Antiseptics are chemicals which either kill or PREVENT the GROWTH of microorganisms and are safe to applied to LIVING tissues
Discussion
12143.

What is the number of carbon present in the final product of given synthesis? overset("excess HI") (to) A underset("ether") overset(Mg)toB underset(H_(3)O^(+))overset(CO_(2))toP

Answer»


SOLUTION :
Discussion
12144.

What is the exact number of isomeric forms of the alcohol produced in saponification of exclusively dextro form of H_(3)C-underset(Et)underset(|)(HC)-O-overset(O)overset(||)(C)-CH_(3)

Answer»


SOLUTION :1, Only DEXTRO.
Discussion
12145.

Which of the following process may be reversible?

Answer»

Transfer of heat by RADIATION
Transfer of heat by CONDUCTION
Electrical heating of a nichrome WIRE
Isothermal compression

SOLUTION :Isothermal process may be REVERSIBLE.
Discussion
12146.

Which acts as a promoter for nickel in the hydrogenation of oils ?

Answer»

Cu
Mo
Fe
Pt

Answer :A
Discussion
12147.

Which of the following metals does not give the following reaction? (M + water rarr oxide or hydroxide + H_(2 ))

Answer»

`FE`
`Na`
`HG`
`AG`

Answer :C::D
Discussion
12148.

The value of K_(c ) for the reaction :3O_(2)(g)hArr 2O_(3)(g)is2.0xx10^(-50)at 25^(@)C. If equilibrium concentration of O_(2) in air at 25^(@)C is 1.6xx10^(-2), the concentration of O_(3) is :

Answer»

`2.86xx10^(-28)M`
`8.192xx10^(-56)M`
`1.43xx10^(-14)M`
`1.6xx10^(-2)M`

ANSWER :A
Discussion
12149.

The unimolecular nucleophilic substitution is represented by :

Answer»

(II)(IV)(P)
(III)(ii)(S)
(I)(i)(R)
(IV)(iii)(Q)

Solution :`Ph-undersetunderset(Cl)|oversetoverset(Ph)|C-oversetoverset(Ph)(|)CH-Phoverset((ii)aq.AgNO_3)toPh-undersetunderset(OH)(|)oversetoverset(Ph)(|)C-oversetoverset(Ph)(|)CH-Ph`
Discussion
12150.

Which of the following given below can liberate Br_(2) from KBr? F_(2),Cl_(2),I_(2) and " Conc. "H_(2)SO_(4)

Answer»

`F_(2), Cl_(2), I_(2) and "Conc. "H_(2)SO_(4)`
`Cl_(2), I_(2) and "Conc. "H_(2)SO_(4)`
`F_(2),Cl_(2), I_(2)`
`F_(2),Cl_(2) and "Conc. "H_(2)SO_(4)`

Answer :D
Discussion