Explore topic-wise InterviewSolutions in .

This section includes InterviewSolutions, each offering curated multiple-choice questions to sharpen your knowledge and support exam preparation. Choose a topic below to get started.

8601.

Weight of Ca(OH)_(2) needed to prepare 250 ml of solution with pH=13

Answer»

0.925 g
0.0125 g
0.25 g
1 g

Solution :We know, `[H^(+)]=10^(-pH)=10^(-13)`
`therefore[OH^(-)]=(10^(-14))/(10^(-13))=10^(-1)`
hence, NORMALITY of solution=0.1
We know, `w=(NEV)/(1000)=(0.1xx74xx250)/(2xx1000)=0.925gm`
Discussion
8602.

Which one of the following functional groups undergoes hydrolysis with alkali to yield an acid group?

Answer»

`-CN`<BR>`-CHO`
`-COCH_(3)`
`-Br`

ANSWER :A
Discussion
8603.

When phenyl magnesium bromide reacts with t-butanol, the product would be

Answer»

Benzene
Phenol
t-butyl
t-butyl phenyl ether

Solution :Phenyl magnesium BROMIDE reacts with t-butanol to PRODUCE benzene because phenyl (electronegative group) is associated with active hydrogen of alcohol i.e. - H of -OH group of alcohol.
Discussion
8604.

The solubility of AgI in NaI solution is less than that in pure water because

Answer»

AgI FORS COMPLEX with NaI
Of COMMON ION EFFECT
Solubility product of AgI is less than that of NaI
The temperature of the solution decreases

Solution :Solubility is decreased due to common ion effect.
Discussion
8605.

Wash and wear clothes are manufactured using

Answer»

terylene FIBRES
NYLON fibres
WOOL fibres
cotton mixed with nylon

ANSWER :A
Discussion
8606.

Which of the following pair of acid and base will produce maximum amount of heat when their same number of gram equivalents is allowed to react?

Answer»

`HCOOH+HN_(3)`
`FCH_(2)COOH+CH_(3)NH_(2)`
`CH_(3)COOH+NH_(3)`
`ClNH_(2)+HCL`

Answer :d
Discussion
8607.

What are the various factors affecting crystal field splitting energy ?

Answer»

Solution :FACTORS affecting crystal field SPLITTING energy are the
(i) field produced by the ligand.
(II) charge on the METAL ion.
Discussion
8608.

Washing soda is:

Answer»

`Na_2CO_3`
`Na_2CO_3. H_2O`
`Na_2CO_3.7H_2O`
`Na_2CO_3.10H_2O`

ANSWER :D
Discussion
8609.

What is the action ofacetyl chloride on diethyl amine (N-ethylethanamine) ?

Answer»

Solution :Diethyl amine on reaction with acetyl chloride forms N-acetyl DIETHYLAMINE.
`UNDERSET("diethyl amine")((C_(2)H_(5))_(2)overset(..)(N)H)+CH_(3)-overset(O)overset("||")C-Cl underset(Delta) overset("pyridine")to underset("N-acetyl diethylamine")((C_(2)H_(5))_(2)overset(..)N-overset(O)overset("||")C-CH_(3)+HCl)`
Discussion
8610.

which of the following is obtained by the oxidation of propionaldehyde:

Answer»

ACETIC ACID
Formic and acetic acid
PROPANOIC acid
n-propyl alcohol

Answer :C
Discussion
8611.

Which of the following monosaccharide is a pentose?

Answer»

GALACTOSE
GLUCOSE
FRUCTOSE
ARABINOSE

ANSWER :D
Discussion
8612.

Which of the following will react fastest (produce more products in a given time) and which will react at the highest rate? A) 1 mol of A and 1 mol of B in a 1L vessel b) 2mol of A andmol of B in a 2L vessel c) 0.2 mol of A and 0.2 mol of B in a 0.1 L vessel.

Answer»


Solution :Fastest Reactants: The rate of reaction is directly proportional to the molar concentration of the REACTING species. Since the 2L vessel has 2 mol of A and 2 mol of B (maximum moles of the reactants), they will react fastest as given in OPTION (b).
HIGHEST reaction rate
Since the vessel in option c) has the maximum molar concentration of the reactants per unit volume, the reaction in vessel (c) will proceed at the highest rate.
Discussion
8613.

Which of the following statement's is /are correct about tautomers?

Answer»

They POSSESS DIFFERENT electronic and atomic ARRANGEMENT
They possess different electronic but same atomic arrangement
They have different atomic arrangements but same electronic arrangement
They EXIST in equilibrium.

Answer :B::D
Discussion
8614.

Which is not used in the determination of reaction rates ?

Answer»

REACTION temperature
Reactant concentration
Specific RATE constant
None of the above

Answer :D
Discussion
8615.

X is a pale yellow solid. It hydrolyses to POCl_(3) in moist air and finally gets converted into phosphoric acid. Z exists as an ionic solid. The total number of atoms present in its cation is.

Answer»

<P>

Solution :`{:(""underset((X))(PCl_(5))+H_(2)O rarr POCl_(3)+ 2 HCl),(POCl_(3)+3H_(2)O rarr H_(3)PO_(4)+3HCl):}`
In the solid state, `PCl_(5)` (X) exists as `[PCl_(4)]^(+) [PCl_(6)]^(-)` in which the cation has 5 atoms (4 Cl + 1 P).
Discussion
8616.

What is corrosion ? Discuss the theory of corrosion.

Answer»

SOLUTION :RUSTING of IRON STARTS.
Discussion
8617.

What ammount of dioxygen (in gram) contains 1.8 xx 10^23 molecules ?

Answer»

`0.960`
`96.0`
`0.960`
`9.60`

Solution :`6.022xx10^(23)` moleculesare present in 32 g of `O_(2)`
` :. "" 1.8 xx10^(22)`MOLECULES will be present in
`32/(6.022 xx10^(23))xx1.8 xx10^(22) g`
` = 0.960` g of `O_(2)`
Discussion
8618.

Two radioactive elements X and Y have half lives 6 min and 15 min respectively. An experiment starts with 8 times as many atoms of X as Y. how long it takes for the number of atoms of X left to equal the number of atoms of Y left?

Answer»

6 min
12 min
48 min
30 min

Answer :d
Discussion
8619.

Which of the following can be seperated by sulphonation?

Answer»

o-Xylene
m - Xylene
p - Xylene
All of the above

Answer :B
Discussion
8620.

Which of the following compounds exhibits optical isomerism?

Answer»


`CH_(2)=C=CH_(2)`

ANSWER :A::C
Discussion
8621.

Which of the following has lowest fusion temperature

Answer»

Naphthalene
Diamond
NaCl
Mn

Solution :The FUSION TEMPERATURE of NAPTHALENE is MINIMUM, because it is non-polar covalent compound and has less fusion temperature.
Discussion
8622.

Which among the following will not show anisotropy ?

Answer»

`BaCl_(2)`
`NaCl`
Glass
`KNO_(3)`

SOLUTION :Crystalling SOILDS such as NaCl, `BaCl_(2)` ect. Will SHOW anistropy.
Discussion
8623.

Which of the following compound is resistant to nucleophilic attack by hydroxyl ions?

Answer»

Methyl acetate
Acetonitrile
Diethy ether
Acetamide

Solution :The compound is DIETHYL ether`(CH_(3)CH_(2))_(2)O` which is resistant to nucleophilic ATTACK by hydroxyl ion due to absence of DOUBLE or triple bond , whereas all other compounds given are unsaturated.
Discussion
8624.

Which electrolyte is least effective in causing coagulation of +ve ferric hydroxide sol

Answer»

`K_(3)[Fe(CN_(6))]`
`K_(2)SO_(4)`
`K_(2)CrO_(4)`
KBr

Answer :D
Discussion
8625.

Under what conditions for temperature and pressure the formation of atomic oxygem from molecular oxygen will be favoured most?

Answer»

<P>high temperature and high PRESSURE
low temperature and low pressure
high temperature and low pressure
low temperature and high pressure

Solution :`O_(2)(g)hArr2O(g)`
`DeltaH_(g)gt0`
so `Q alpha(1)/(V)rArr` on P decreaes
`rArrV` INCREASES `rArrQltK` forward favour ENDO in forwad direction so on increasing temperature forward favour
Discussion
8626.

What is westrosol?

Answer»

SOLUTION :Westrol is TRICHLOROETHYLENE which is USED as a SOLVENT
Discussion
8627.

Which of the following is an example for bio degradable plastic?

Answer»

POLYSTYRENE
POLY VINYL chloride
bakelite
polylactic ACID

SOLUTION :polylactic acid
Discussion
8628.

Which shows oxidising properties:

Answer»

LIME water
Baryta water
Distilled water
Chlorine water

Answer :D
Discussion
8629.

Which of the following is correct statement

Answer»

proteins are not AMINO acids
`alpha`-HYDROGEN is PRESENT in fructose
starch is polymer of `alpha`-glucose
Amylose is COMPOUND of cellulose

Solution :Starch is polymer of alpha glucose.
Discussion
8630.

What is the rate law for the reaction. NO_(2_((g)))+CO_((g)) to NO_((g))+CO_(2_((g))) The reaction occurs in the following steps: (i) NO_(2)+NO_(2) to NO_(3)+NO("slow") (ii) NO_(3)+CO to NO_(2)+CO_(2)("fast") What is the role of NO_(3)?

Answer»

Solution :Overall REACTION:
`NO_(2_((g)))+CO_((g)) to NO_((g))+CO_(2_((g)))`
`"Step-I" NO_(2)+NO_(2) to NO_(3)+NO("SLOW")`
`"Step-II" NO_(3)+CO to NO_(2)+CO("fast")`
(A) From first RATE DETERMINING slow step, rate law is, Rate =`k[NO_(2)]^(2)`
Role of `NO_(3)` : In the reaction, `NO_(3)` is the reaction intermediate which is FORMED in first step and removed in the second step.
Discussion
8631.

Which is the correct representation for the solubility product constant of Ag_2CrO_4?

Answer»

`[AG^+]^2 [CrO_(4)^(2-)]`
`[2Ag^+][CrO_(4)^(2-)]`
`[Ag^+ ][CrO_(4) ^(2-)]`
`[2Ag^+][CrO_(4)^(2-)]`

Solution :`Ag_2CrO_4hArr 2Ag^(+)+CrO_(4)^(2-)`
` K_(sp )=[Ag^+]^2 [CrO_(4)^(2-)]`
Discussion
8632.

Which of the following compounds can show geometrical isomerism.

Answer»




SOLUTION :
Discussion
8633.

Which of the following hybrid orbitals has highest s - character ?

Answer»

`SP^(3)`
`sp^(2)`
`sp`
All have same s-character.

ANSWER :C
Discussion
8634.

Which is the first biodegradable polymer used for post operative stiches ?

Answer»

PGA
PLA
Daxtran
Nylon-2 Nylon-6

SOLUTION :Daxtran
Discussion
8635.

Which of the following represents the correct sets of the four quantum mumbers of a 4d electron?

Answer»

`4, 2, 1, - (1)/(2)`
`4, 3, 2, + (1)/(2)`
`4, 3, -2,+(1)/(2)`
4, 2, 1, 0

Answer :A
Discussion
8636.

The volume of oxygen required for complete oxidation of

Answer»

2litre
4litre
1litre
3litre

Answer :B
Discussion
8637.

What isthecompositionofcoppermatte?

Answer»

SOLUTION :Coppermattechieflyconsistsof` CU _2 S ` alongwithsomeunchangedFeS.
Discussion
8638.

Which reagent can convert acetic acid into ethanol

Answer»

`Na+` ALCOHOL
`LiAlH_(4)` + ETHER
`H_(2)+Pt`
`Sn+ HCL`

SOLUTION :`LiAIH_(4)+` ether, is reducing agent.
Discussion
8639.

Which of the following has all of its electrons paired ?

Answer»

`Pr ^(3+)`
`Ce ^(3+)`
`Tb ^(4+)`
none of these

Solution :`Pr^(3+)` has figuration `(4f^(2)),` 2 unpaired electrons. `Ce^(3+)(4f^(1))` configuration, 1 unpaired electrons. `Tb ^(4+)(4f^(7))` configuration , 1 unpaired electrons.
`Tb^(4+) (4f^(7))` configuration, 7 unpaired electrons.
All ions does not have PAIRED electrons.
Discussion
8640.

Which of the following does not undergo aldol condensation ?

Answer»

`ClCH_(2)CHO`
`C Cl_(3)-CHO`
`C_(6)H_(5)CH_(2)CHO`
`CH_(3)CHO`

Answer :B
Discussion
8641.

What happens when chlorine gas is passed through a hot concentrated solution of NaOH ?

Answer»

Solution :On TREATMENT with hot concentrated NaOH, `Cl_(2)` undergoes DISPROPORTIONATION to form sodium chloride and sodium chlorate.
`3 overset(0)(Cl_(2)) (g) + 3NaOH (aq) overset("Hot")rarr 5 Naoverset(-1)(CL) (aq) + underset("Sod. chlorate")(Naoverset(+5)(ClO)_(3))(aq)+3H_(2)O (L)`
Discussion
8642.

What are transition metals ?

Answer»

SOLUTION :These are elements of group-3 to 12 in the periodic table through which the METALLIC properties CHANGE over gradually to non-metallic properties.
Discussion
8643.

This law was given by, a French chemist , Joseph Proust. He stated that a given compound always contains exactly the same proportion of elements by weight. Proust worked with two samples of curpic carbonate- one of which was of natural origin and the other was synthetic one . He found that the composition of elements present in it was for both the samples as shown below: Thus, irrespective of the source, a given compound always contains same elements in the same proportion. The validity of this law has been confrmed by various experiments. It is sometimes also reffered to as Law of constant composition. Limitation: This law is not applicable if the compound is formed from different isotopes of an element . The two isotopes of carbon C-12 and C-14 form carbondioxide C^(12)O_(2) and C^(14)O_(2) . The ratio of C : O is 12 : 32 and 14 : 32 respectively .It is not a constant ratio. 0.5 G silver is dissolved in excess of nitric acid. This solution is treated with excess of NaCl solution when 0.66 g AgCl is formed. One gram metallic silver wire is heated in dry Cl_(2) ,1.32 g AgCl is formed . Show that these data confirm the law of constant proportion.

Answer»


ANSWER :`%AG=(0.5)/(0.66)xx100=75.75`
`%Ag=(1)/(1.32)xx100=75.75`
In both `AGCL,%` Ag is same,
Discussion
8644.

This law was given by, a French chemist , Joseph Proust. He stated that a given compound always contains exactly the same proportion of elements by weight. Proust worked with two samples of curpic carbonate- one of which was of natural origin and the other was synthetic one . He found that the composition of elements present in it was for both the samples as shown below: Thus, irrespective of the source, a given compound always contains same elements in the same proportion. The validity of this law has been confrmed by various experiments. It is sometimes also reffered to as Law of constant composition. Limitation: This law is not applicable if the compound is formed from different isotopes of an element . The two isotopes of carbon C-12 and C-14 form carbondioxide C^(12)O_(2) and C^(14)O_(2) . The ratio of C : O is 12 : 32 and 14 : 32 respectively .It is not a constant ratio. 6.488 g lead with 1.002 g oxygen to form an oxide. This oxide is also obtained by heating Pb(NO_(3))_(2), Itis found that % of lead in this oxide is 86.62 .Show that these date illustrate the law of definite proportions.

Answer»


ANSWER :`%PB=(6.488+1.002)/((6.488+1.002))xx100=86.6%`
Discussion
8645.

Ziegler-Natta catalyst is used to prepare

Answer»

low - density polythene
teflon
HIGH - density polythene
nylong - 6

SOLUTION :
`TiCl_4+Al(C_2H_5)_3implies` ZIEGLER - Natta CATAYST.
Discussion
8646.

What is the difference between a chemical cell and a concentration cell?

Answer»

Solution :A chemical cell is a GALVANIC cell in which electrical energy produced is due to chemical changes occuring within the cell and no transfer of matter takes place. It involves the use of two different electrodes dipped in solutions of different electrolytes.
A CONCENTRATION cell is a galvanic cell in which electrical energy is produced due to PHYSICAL change INVOLVING transfer of matter from one part of the cell to the other. it involves the use of the same electrodes depped in solutions of the same electroyte with different concentrtaions (or ELECTRONES of different concentration dipped in the same solution of the electrolyte).
Discussion
8647.

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

Answer»

SOLUTION :
Discussion
8648.

Vander Waal constant for gas molecules are given: {:("Gas",a(L^(2)"atm//"mol^(2)),b(L//"mol")),(He,0.0341,0.02370),(Ne,0.211,0.0171),(Xe,4.19,0.0510),(O_(2),1.36,0.0310):}

Answer»

He is monoatomic GAS, where as nearly all molecules that make up air are DIATOMIC eg:
`N_(2),O_(2)` etc.
Ne
Xe
`O_(2)`

SOLUTION :THEORY based
Discussion
8649.

Which of the followinghydrocarbons is obtained whien 1, 1-ddibromopropane is treated with sodium in ether solution?

Answer»

Propene
Propane
Propyne
Hex-3-ene

Solution :`2CH_(3)CH_(2)-underst(Br)underset(|)(CH)-Br underset("ether")overset("Na)to CH_(3)CH_(2)CH=CHCH_(2)CH_(3)`
It is an extension of the WURTZ synthesis. Use of Na tends to PRODUCE LENGTHENING of the carbon chain.
Discussion
8650.

Which of the following can decompose on heating to give CO_(2) ?

Answer»

`Li_(2)CO_(3)`
`Na_(2)CO_(3)`
`KHCO_(3)`
`BaCO_(3)`

Answer :A::C::D
Discussion