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.

751.

When solution of silver nitrate and potassium bromide are mixed a pale yellow precipitate is formed. (i)(a)What is thename of the pale yellow precipitate? (b)Is it soluble or insoluble? (ii)Is the formation of silver bromide precipitate,a result of redox reaction or not"Justify your answer. (iii)What is this type of reaction called?

Answer»

Solution :(i)(a)The pale yellow precipitate is silver BROMIDE
(b)Silver bromide is sparingly soluble.
(III)Yes ,the FORMATION of silver bromide precipitate is due to redox REACTION .`Ag^(-)` gains electron (reduction) and `Br^(-)` loses electron (oxidation).So it is a redox reaction.
(iii)This reaction is double displacement reaction.
Discussion
752.

Which of the following mixed with ethanol to denature it ?

Answer»

OXYGEN
METHANE
ACETONE
METHANOL

ANSWER :D
Discussion
753.

You have been provided with three test tubes. One of them contains distilled water and the other two contain an acidic solution and a basic solution, respectively. If you are given only red litmus solution, how will you identify the contents of each test tube ?

Answer»

Solution :Add a few DROPS of red litmus solution to each test tube. Red COLOUR will become light in the test tube containing water. Colour will turn blue in the test tube containing BASIC solution. Red colour will become DARK in the test tube containing acidic solution
Discussion
754.

V_(1) mL of x molar hydrochloric acid is mixed with V_(2) mL of y molar sodium hydroxide. Arrange the following steps in correct sequence for calculation of pH of the mixture. (y gt x and V_(1) gt V_(2)) (1) Calculation of the number of equivalents of acid and base (2) Calculation of the total volume of mixture (3) Calculation of the normality of acid and base (4) Calculation of the net OH^(-) ion concentration. (5) Taking the negative logarithm of H^(+) ion concentration. (6) Dividing K_(w) " by " OH^(-) ion concentration

Answer»

1 3 2 6 4 5
3 1 2 4 5 6
3 1 2 6 4 5
1 2 3 4 5 6

Solution :(i) CALCULATION of the normality of acid and base
(ii) calculation of the number of equivalents of acid and base
(iii) calculation of the total volume of the mixture
(iv) calculation of the net `OH^(-)` ion concentration
(v) dividing `K_(w) " by " OH^(-)` ion concentration
(vi) taking the negative logarithm of `H^(+)` ion concentration
Discussion
755.

Write the molecular formula of the following: (i) Hexane, (ii) Benzene.

Answer»


ANSWER :(i) Hexane : `C_(6)H_(14)`
(II) Benzene :`C_(6)H_(6)`
Discussion
756.

which of the following compound is used in white washing of walls?

Answer»

CAO
`CA(OH)_2`
Ca
All

Answer :A
Discussion
757.

Which of the following statements is (are) correct about the bonding in metals ?

Answer»

Metal ATOMS from anions
Metal atoms FORM cations.
The atoms in a metal are haphazardly distributed.
Layers of atoms cannot SLIP over each other.

ANSWER :B
Discussion
758.

You have been provided with three test tubes. One of them cotains distilled water and the other two cotain an acidic solution and a basic solution, respectively. If you are given only red litmus paper , how will you identify the contents of each test tube ?

Answer»

SOLUTION :If the COLOUR of red LITMUS paper does not CHANGES them it is acid. If the colour of red litmus changes to blue then it BASE. If there is slight changes in the colour of red litmus (such as purple ) then it is distilled water .
Discussion
759.

When a red litmus paper treated with sodium hydroxide solution , the colour of the litmus paper becomes

Answer»

BLUE
brown
green
VIOLET

ANSWER :A
Discussion
760.

What would be the colour of the solution when a metal oxide and dilute hydrochloric acid are mixed ?

Answer»
Discussion
761.

To the three solutions listed below, a few drops of phenolphthalein and blue litmus were added separately . Specify the colour in each case, if any :

Answer»

SOLUTION :
Discussion
762.

Write the next homologue of each of the following: (i) C_(2)H_(4)"" (ii) C_(4)H_(6)

Answer»

Solution :`(i) C_(3)H_(6) (ii) C_(5)H_(8)`
Discussion
763.

Which of the following element would lose an electron easily?

Answer»

Mg
Na
K
Ca
Discussion
764.

When acetaldehyde is oxidised with acidified potassium dichromate, it forms _____(ester/ethanol/acetic acid)

Answer»

SOLUTION :ACETIC ACID
Discussion
765.

When an oxide of a non-metal reacts with water which of the following is formed?

Answer»

acid
base
salt
none of these

ANSWER :A
Discussion
766.

Write the molecular formula of benzene and state the number of double bonds in its structure.

Answer»

SOLUTION :Molecular FORMULA - `C_6H_6` and it has three DOUBLE BONDS.
Discussion
767.

Write the IUPAC names of the following compounds using their structural formulae : 1. CH_(3)-CH_(2)-CH_(2)-Cl 2. CH_(3)-underset(CH_(3))underset(|)CH-CH_(2)-Br 3. CH_(3)-CH_(2)-underset(Br)underset(|)CH-CH_(2)-CH_(3) 4. CH_(3)-CH_(2)-CH_(2)-CH_(2)-OH 5. H_(3)C-underset(OH)underset(|)overset(CH_(3))overset(|)C-CH_(3) 6. CH_(3)-CH_(2)-underset(OH)underset(|)CH-CH_(3) 7. CH_(3)-CH_(2)-CH_(2)-CHO 8. CH_(3)-CHO 9. CH_(3)-CH_(2)-CH_(2)-CH_(2)-CHO 10 CH_(3)-CO-CH_(3) 11. CH_(3)-CH_(2)-CO-CH_(3) 12. CH_(3)-CH_(2)-CH_(2)-CO-CH_(3) 13. CH_(3)-CH_(2)-COOH 14. CH_(3)-CH_(2)-CH_(2)-COOH 15. CH_(3)-COOH 16. CH_(3)-CH=CH_(2) 17. CH_(3)-CH_(2)-CH=CH_(2) 18. CH_(3)-C-=CH 19. CH_(3)-CH_(2)-C-=CH 20. CH-=CH

Answer»

SOLUTION :
Discussion
768.

When an equeous solution of potassium chloride is added to an aqueous solution of silver nitrate,a white preciptate is formed.Give the chemical of this reaction.

Answer»

Solution :`KCl_((aq))+AgNO_((aq))toAgCl_((s))+KNO_(3(aq))`
Formation of WHITE PRECIPITATE by the above reaction is due to formation of silver CHLORIDE (AgCl)
Discussion
769.

Why are the elements of group 18 called noble gases?

Answer»

SOLUTION :Because they do not REACT with COMMON ELEMENTS.
Discussion
770.

Who proposed that volume of a gas at given temperature and pressure is proportional to number of particles?

Answer»

SOLUTION :AVOGADRO .
Discussion
771.

Which metals do not corrode easily?

Answer»

SOLUTION :SILVER, GOLD, PLATINUM and TITANIUM
Discussion
772.

When barium chloride reacts with sodium sulphate ,the product formed is………….and it is a …….precipitate.

Answer»

SOLUTION :BARIUM SULPHATE,WHITE
Discussion
773.

Write the names and symbols of two most reactive metals. Explain by drawing electronic structure how any one of them reacts with a halogen.Explain any two physical properties of the compound formed.

Answer»

Solution :Most reactive metals are NA (SODIUM ) and K(Potassium)

Physical properties:
(i) Physical nature :Hard and solid due to strong attractive forces between oppositely charged IONS.
(ii) High melting point and boiling point because more amount of ENERGY is required to break strong force of attraction.
Discussion
774.

When the electrolysis of acidified water is carried out : (a) What is the ratio of the volume of hydrogen produced to the volume of oxygen ? Give the equation for the discharge of ions at the two electrodes .

Answer»

Solution :(a) Volume of `H_(2) ` : Volume of `O_(2) = 2:1 `
(b) `4OH^(-) to 2H_(2)O +O__(2) +4e^(-)`
`2H^(+) + 2E^(-) to H_(2)`
Discussion
775.

The valume occupied by "4.4 g of "CO_(2) at S.T.P is …………… .

Answer»

22.4 L
2.24 L
0.224 L
0.1 L

Solution :HINT : `"4.4 G of "CO_(2)" at S.T.P occupies 22.4 L"`
`THEREFORE"4.4 g of "CO_(2)" at S.T.P will occupy"(22.4)/(44)xx4.4=2.24L`
Discussion
776.

Write the number of electrons in L shell of carbon, oxygen and nitrogen respectively.

Answer»

SOLUTION :4, 6 and 5
Discussion
777.

Which products are formed by the reaction between ethanol and sodium ?

Answer»

Sodium ethanoate and hydrogen
Sodium ethanoate and OXYGEN
Sodium ethoxide and hydrogen
Sodium ethoxide and oxygen

ANSWER :C
Discussion
778.

Which of the following metals exist in their native state in nature ? (i) Cu (ii) Au (iii) Zn(iv) Ag

Answer»

(i) and (II)
(ii) and (iii)
(ii) and (iv)
(iii) and (iv)

Solution : AU and Ag are unreactive METALS and therefore exist in their native state
Discussion
779.

What are the demerits of Mendeleev's periodic table?

Answer»

Solution :(i) No fixed position COULD be given to HYDROGEN which resembles alkali metals and halogens in the periodic table.
(ii) Isotopes have DIFFERENT atomic masses butsame chemical PROPERTIES. BASED on chemical properties, they were to be placed in same group, while based on atomic masses, they were used to be placed in different groups . Hence, there was no definite place for isotopes.
(iii) In certain places, elements with higher atomic mass were placed before elements of lower mass e.g. Co (At. Mass 58.93) was placed before Ni (At. Mass 58.71)
(iv) Some elements with different properties were placed in the same group. e.g. (Mn) Manganese was placed with halogens which totally differ in properties.
Discussion
780.

Under same conditions of temperature and pressure if you collect 3 litre of O_(2), 5 litre of Cl_(2) and 6 litre of H_(2), i. Which has the highest number of molecules? ii. Which has the lowest number of number of molecules?

Answer»

SOLUTION :`"Number of moles of "O_(2)=("Volume of S.T.P")/("Molar volume")`
`=(3)/(22.4)="0.1339 moles"`
`"Number of MOLECULES"="Number of moles"xx"Avogadro number"`
`=0.1339xx6.023xx10^(23)`
`=0.8064xx10^(23)`
`=8.064xx10^(22)O_(2)` molecules.
`"Number of moles of "Cl_(2)=(5)/(22.4)="0.2232 moles"`
`"Number of molecules"=0.2232xx6.023xx10^(23)`
`=1.344xx10^(23)" molecules."`
`"Number of moles of "H_(2)=(6)/(22.4)=0.2678" moles"`
`"Number of molecules"=0.2678xx6.023xx10^(23)`
`=1.6129xx10^(23)" molecules."`
i. 6 litre of `H_(2)` has the highest number of molcules.
ii. 3 litres of `O_(2)` has the LOWEST number of molecules.
Discussion
781.

Whatis gramatomicmass? Giveexample?

Answer»

SOLUTION :If theatomicmass ofan elementis expressedingramsit isknownas gramatomic mass
E.G , gramatomicmassofhydrogen= 1 g
GRAMATOMICMASSOF oxygen= 16 g
Discussion
782.

Yellow precipipateof leadiodidefromleadnitrateis anexampleof ____________ reaction .

Answer»

SOLUTION :DOUBLE DISPLACEMENT
Discussion
783.

What is the functional group present in the following compound ? Also name the compound . CH_(3)-overset(H)overset(|) underset(OH)underset(|)C - overset(H)overset(|) underset(H)underset(|)C-CH_(3)

Answer»

SOLUTION :Functional group : alcohol (-OH)
NAME : 2. butanol
Discussion
784.

Think about it, The atomic number of beryllium is 4 while that of oxygen is 8. Write down the electronic configuration of the two and deduce their valency from the same.

Answer»

Solution :Atomic number of BERYLLIUM is 4
`:.` Its ELECTRONIC configuration is 2, 2
Atomic number of oxygen is 8
`:.` Its electronic configuration is 2, 6
Valency of Beryllium is 2
and valency of Oxygen is also 2.
Discussion
785.

The temperature at which a liquid starts boiling is called

Answer»

its melting POINT
its freezing point
its BOILING point
none of these

ANSWER :C
Discussion
786.

Which of the following is not an organic compound ?

Answer»

ACETIC ACID
CHLOROFORM
Water
Ethanol

Solution :`H_(2)O` does not contain CARBON.
Discussion
787.

Nonconventional Sources of Energy

Answer»

SOLUTION :MR SUNDERLAL BAHUGUNA
Discussion
788.

Which of the following has the highest number number of molecules?

Answer»

1 LITRE of `N_(2)`
2 litres of oxygen
5 litres of `Cl_(2)`
6 litres of Hydrogen

Solution :6 litres of Hydrogen
Discussion
789.

What are the products formed when an acid reacts witha base ?

Answer»

SOLUTION :Acid REACTS with a BASE to FORM salt and water.
Discussion
790.

The reduction of acidified solution of ferric ions by hydrogengas takesplace in thepresence of zinc. Explain.

Answer»

Solution :REDUCTION of acidified solution of FERRIC ions by hydrogen gas does not TAKE PLACE. If a small amount of Zn is added to reaction mixture, the hydrogen gas is converted into nascent hydrogen by Zn. The nascent hydrogen is highly reactive reactive and it reduces ferric ions toferrous ions.
Discussion
791.

Which of the following pH values corresponds to that of abasic solution ?

Answer»

2
4
6
8

Answer :D
Discussion
792.

When a substance gains electron, it is called :

Answer»


ANSWER :OXIDISING AGENT
Discussion
793.

Which among the following has a sweet smell ?

Answer»

`CH_3OCH_3`
`CH_3COCH_3`
`CH_3COOH`
`CH_3OH`

ANSWER :C
Discussion
794.

What is meant by a chemical reaction?

Answer»

Solution :A process in which TWO or more substances REACT to from some other NEW substances with new SET of properties is called a chemical reaction.
Discussion
795.

Volumeof agasat STP is 1.12xx10 ^(-7) cc .Calculatethe numberof moleculesin it :

Answer»

`3.01xx10 ^(20)`
`3.01 xx 10 ^(15)`
`3.01xx 10 ^(23)`
`3.01 xx 10^(24)`

Solution :`22.4Its= 6.23 xx 10 ^(23)` MOLECULES
`1.12xx 10 ^(-7) cc= ( 6.023 xx 10 ^(23) xxoverset(0.05)(cancel (1.12))xx10 ^(-7))/(cancel (22.4))`
`=6.023xx0.05xx10 ^((23-7))`
`= 0.30115xx10 ^(16)`
`=3.0115 xx 10 ^(15)`
Discussion
796.

Which of the following statements is not correct ?

Answer»

a)All METAL carbonates react with acid to give a salt, water and carbon dioxide
b)All metal oxides react with water to give salt and acid
c)Some METALS react with acids to give salt and hydrogen
d)Some non-metal oxides REACTS with water to form an acid

Solution :All metal oxides react with water to give salt and acid
Discussion
797.

What is observed when carbondioxide gas is passed through lime water For a short duration ?

Answer»

Solution :For short duration : Lime water turns milky due to the formation of calcium carbonate `(CaCO_(3))` which is INSOLUBLE in water
`Ca(OH)_(2)(aq)+CO_(2)(g)tounderset("WHITE PPT")(CaCO_(3)(s))+H_(2)O(l)`
Discussion
798.

What is the general name given to the elements of atomic numbers from 89-103?

Answer»

SOLUTION : Elements from ATOMIC numbers 89-103 are CALLED ACTINOIDS.
Discussion
799.

Why do we apply paint on iron articles ?

Answer»

SOLUTION :We apply paint on IRON articles to prevent them from corrosion. paint prevents iron from coming in contact with air and moisture. THUS, it prevents rusting of iron articles.
Discussion
800.

Who proposed ionic theory of acid and bases.

Answer»

Arrhenius
Bronsted
Lewis
Lowry

Answer :A
Discussion