125876 + Interview Questions in General QA

1.	Which of the following is a combination and which is a displacement reaction ?(a) Cl2 + 2KI ——-> 2KCl + I2 (b) 2K + Cl2 ——–> 2KCl
Answer» (a) Displacement reaction. (b) Combination reaction.

1.

Which of the following is a combination and which is a displacement reaction ?(a) Cl2 + 2KI ——-> 2KCl + I2 (b) 2K + Cl2 ——–> 2KCl

Answer»

(a) Displacement reaction.

(b) Combination reaction.

Discussion

2.	In the following reaction between lead sulphide and hydrogen peroxide : PbS (s) + 4H2O2 (aq) ————-> PbS04 (s) + 4H2 O (l) (a) Which substance is reduced ? (b) Which substance is oxidised ?
Answer» (a) H₂O₂ (b) PbS

2.

In the following reaction between lead sulphide and hydrogen peroxide : PbS (s) + 4H2O2 (aq) ————-> PbS04 (s) + 4H2 O (l) (a) Which substance is reduced ? (b) Which substance is oxidised ?

Answer»

(a) H₂O₂

(b) PbS

Discussion

3.	What type of chemical reactions are represented by the following equations ?1. A + BC ——- > AC + B 2. A + B ——- > C 3. X ——- > Y + Z 4. PQ + RS —— > PS + RQ 5. A2O3 + 2B —–> B2O3 + 2A
Answer» 1. Displacement reaction. 2. Combination reaction. 3. Decomposition reaction. 4. Double displacement reaction. 5. Displacement reaction.

3.

What type of chemical reactions are represented by the following equations ?1. A + BC ——- > AC + B 2. A + B ——- > C 3. X ——- > Y + Z 4. PQ + RS —— > PS + RQ 5. A2O3 + 2B —–> B2O3 + 2A

Answer»

1. Displacement reaction.

2. Combination reaction.

3. Decomposition reaction.

4. Double displacement reaction.

5. Displacement reaction.

Discussion

4.	What type of reactions are represented by the following equations ?(a) CaO + CO ———- > CaCO3(b) 2Na + 2H2O —— > 2NaOH + H2(c) Mg + CuS04 ——— > MgSO4 + Cu(d) NH4 NO2 ——- > N2 + 2H2O (e) CuS04 + 2NaOH ——– > Cu(OH)2 + Na2 SO4
Answer» (a) Combination reaction. (b) Displacement reaction. (c) Displacement reaction. (d) Decomposition reaction. (e) Double displacement reaction.

4.

What type of reactions are represented by the following equations ?(a) CaO + CO ———- > CaCO3(b) 2Na + 2H2O —— > 2NaOH + H2(c) Mg + CuS04 ——— > MgSO4 + Cu(d) NH4 NO2 ——- > N2 + 2H2O (e) CuS04 + 2NaOH ——– > Cu(OH)2 + Na2 SO4

Answer»

(a) Combination reaction.

(b) Displacement reaction.

(c) Displacement reaction.

(d) Decomposition reaction.

(e) Double displacement reaction.

Discussion

5.	In the reaction represented by the following equation : CuO(s) + H2 (g) ————- > Cu (s) + H2 0(1) (a) name the substance oxidised (b) name the substance reduced (c) name the oxidising agent (d) name the reducing agent
Answer» (a) H₂ (b) CuO (c) CuO (d) H₂

5.

In the reaction represented by the following equation : CuO(s) + H2 (g) ————- > Cu (s) + H2 0(1) (a) name the substance oxidised (b) name the substance reduced (c) name the oxidising agent (d) name the reducing agent

Answer»

(a) H₂

(b) CuO

(c) CuO

(d) H₂

Discussion

6.	The reactants in the following word equation are _______.Zinc + Sulphuric acid → Zinc sulphate + Hydrogen(i) Zinc(ii) Zinc sulphate(iii) Sulphuric acid(iv) Hydrogen(A) (i) and (ii)(B) (i) and (iii)(C) (i) and (iv)(D) (ii) and (iv)
Answer» (B) (i) and (iii)

Discussion

7.	Which of the following is incorrect regarding a word equation?(A) Change of reactants to products is shown through an arrow placed between them.(B) The reactants are written on the left-hand side of the equation.(C) The products are written on the right-hand side of the equation.(D) The arrowhead points towards the reactants and shows the direction of the reaction.
Answer» (D) The arrowhead points towards the reactants and shows the direction of the reaction. The arrowhead in the word equation points towards the products and shows the direction of the reaction.

7.

Which of the following is incorrect regarding a word equation?(A) Change of reactants to products is shown through an arrow placed between them.(B) The reactants are written on the left-hand side of the equation.(C) The products are written on the right-hand side of the equation.(D) The arrowhead points towards the reactants and shows the direction of the reaction.

Answer»

(D) The arrowhead points towards the reactants and shows the direction of the reaction.

The arrowhead in the word equation points towards the products and shows the direction of the reaction.

Discussion

8.	Balance the following chemical equation :Fe + H2O → Fe3O4+H2
Answer» 3Fe + 4H₂O → Fe₃O₄+4H₂

Discussion

9.	An arrow pointing downwards in a chemical reaction shows ………………. A) Evolution of gas B) Formation of precipitate C) Oxidation D) Displacement
Answer» B) Formation of precipitate

Discussion

10.	Name one reaction which is accompanied by the evolution of heat.
Answer» All reactions which are Exothermic are accompanied by evolution of heat. One such example is burning of methane. Reaction is as Follows: CH₄(g) + 2O₂ (g) → CO₂ (g)+ 2H₂O (g)

10.

Name one reaction which is accompanied by the evolution of heat.

Answer»

All reactions which are Exothermic are accompanied by evolution of heat. One such example is burning of methane.

Reaction is as Follows:

CH₄(g) + 2O₂ (g) → CO₂ (g)+ 2H₂O (g)

Discussion

11.	Give one example.Chemical reaction showing evolution of gas.
Answer» Chemical reaction showing evolution of gas : Zn+H₂SO₄ →ZnSO₄+H₂↑

11.

Give one example.Chemical reaction showing evolution of gas.

Answer»

Chemical reaction showing evolution of gas :

Zn+H₂SO₄ →ZnSO₄+H₂↑

Discussion

12.	Translate the following statements into chemical equations and then balance them.(a) Hydrogen gas combines with nitrogen to form ammonia.(b) Hydrogen sulphide gas burns in air to give water and sulpur dioxide.(c) Barium chloride reacts with aluminium sulphate to give aluminium chloride and a precipitate of barium sulphate.(d) Potassium metal reacts with water to give potassium hydroxide and hydrogen gas.
Answer» (a) 2N₂ + 3H₂→ 2NH₃ (b) 2H₂S + 3O₂ →2SO₂↑ +2H₂O (c) 3BaCl₂ + Al₂(SO₄)₃ →2AlCl₃+3BaSO₄ (d) 2K+2H₂O→ 2KOH+H₂↑

12.

Translate the following statements into chemical equations and then balance them.(a) Hydrogen gas combines with nitrogen to form ammonia.(b) Hydrogen sulphide gas burns in air to give water and sulpur dioxide.(c) Barium chloride reacts with aluminium sulphate to give aluminium chloride and a precipitate of barium sulphate.(d) Potassium metal reacts with water to give potassium hydroxide and hydrogen gas.

Answer»

(a) 2N₂ + 3H₂→ 2NH₃

(b) 2H₂S + 3O₂ →2SO₂↑ +2H₂O

(c) 3BaCl₂ + Al₂(SO₄)₃ →2AlCl₃+3BaSO₄

(d) 2K+2H₂O→ 2KOH+H₂↑

Discussion

13.	Identify the substances that are oxidized and that are reduced in the following equation.i) 4Na(s) + O2(g) → 2Na2O(s)ii) CuO(s) + H2(g) → Cu(s) + H2O(l)
Answer» The Sodium (Na) in the first equation is getting oxidized with the addition of Oxygen (O₂) and the Copper (Cu) in the second equation is reduced due to the addition of Hydrogen (H₂) The Sodium (Na) in the first equation is getting oxidized with the addition of Oxygen (O₂) and the Copper (Cu) in the second equation is reduced due to the addition of Hydrogen (H₂)

13.

Identify the substances that are oxidized and that are reduced in the following equation.i) 4Na(s) + O2(g) → 2Na2O(s)ii) CuO(s) + H2(g) → Cu(s) + H2O(l)

Answer»

The Sodium (Na) in the first equation is getting oxidized with the addition of Oxygen (O₂) and the Copper (Cu) in the second equation is reduced due to the addition of Hydrogen (H₂)

The Sodium (Na) in the first equation is getting oxidized with the addition of Oxygen (O₂) and the Copper (Cu) in the second equation is reduced due to the addition of Hydrogen (H₂)

Discussion

14.	Give one example.Change in substance's colour during a chemical reaction.
Answer» Change in Substance's colour during a chemical reaction : 2FeSO₄(s)+heat → Fe₂O₃(s)+SO₂(g)+SO₃(g) Ferrous Sulphate(Green colour) Ferric Oxide(Red-brown colour)

14.

Give one example.Change in substance's colour during a chemical reaction.

Answer»

Change in Substance's colour during a chemical reaction :

2FeSO₄(s)+heat → Fe₂O₃(s)+SO₂(g)+SO₃(g)

Ferrous Sulphate(Green colour) Ferric Oxide(Red-brown colour)

Discussion

15.	A student added aluminium pieces in ferrous sulphate solution taken in a test-tube. Write down the colour change she observed in the solution?
Answer» Solution becomes pale green to colourless.

Discussion

16.	Write the chemical equation of the reaction with an example each in which the following change has taken place:(i) Change in colour(ii) Change in temperature (iii) Formation of precipitate.
Answer» (i) Change in colour: Reaction between lead nitrate solution and potassium iodide solution. Pb(NO₃)₂(aq)+2KI → PbI₂(s)+2KNO₃(aq) In this reaction, colour changes from colourless to yellow. (ii)Change in temperature: Action of dilute sulphuric acid on zinc. Zn(s) + H₂SO₄(aq) → ZnSO₄(aq) + H₂ In this reaction, heat is evolved (iii) Formation of precipitate: Action of barium chloride on sodium sulphate. BaCl₂(aq) +Na₂SO₄(aq) → BaSO₄(s) +2NaCl(aq) BaSO₄(s) - ppt

16.

Write the chemical equation of the reaction with an example each in which the following change has taken place:(i) Change in colour(ii) Change in temperature (iii) Formation of precipitate.

Answer»

(i) Change in colour: Reaction between lead nitrate solution and potassium iodide solution.

Pb(NO₃)₂(aq)+2KI → PbI₂(s)+2KNO₃(aq)

In this reaction, colour changes from colourless to yellow.

(ii)Change in temperature: Action of dilute sulphuric acid on zinc.

Zn(s) + H₂SO₄(aq) → ZnSO₄(aq) + H₂

In this reaction, heat is evolved

(iii) Formation of precipitate: Action of barium chloride on sodium sulphate.

BaCl₂(aq) +Na₂SO₄(aq) → BaSO₄(s) +2NaCl(aq)

BaSO₄(s) - ppt

Discussion

17.	Complete and balance the following chemical equation:(i) CaCO3 + HCl(ii) Al+HCl(iii) MnO2+HCl
Answer» (i) CaCO₃(s) 2HCl(aq) → CaCl₂(s)+H₂O(l)+CO₂(g) (ii) 2Al(s)+6HCl(aq) → 2AlCl(aq)+3H₂(g) (iii) MnO₂+4HCl(aq) → MnCl₂+2H₂O(l)+Cl₂(g)

17.

Complete and balance the following chemical equation:(i) CaCO3 + HCl(ii) Al+HCl(iii) MnO2+HCl

Answer»

(i) CaCO₃(s) 2HCl(aq) → CaCl₂(s)+H₂O(l)+CO₂(g)

(ii) 2Al(s)+6HCl(aq) → 2AlCl(aq)+3H₂(g)

(iii) MnO₂+4HCl(aq) → MnCl₂+2H₂O(l)+Cl₂(g)

Discussion

18.	Mention the function of Glycocalyx.
Answer» It is a thick, gelatinous layer bound tightly to the cell wall of bacteria. It protects the cell from dehydration and antibodies.

Discussion

19.	What are polysomes?
Answer» Ribosomes held together, by mRNA form polysomes or polyribosomes and are the sites of protein synthesis in a cell.

Discussion

20.	Genophore is seen in ..........(a) Amoeba (b) Cyanobacteria (c) Chlamydomonas (d) Euglena
Answer» Genophore is seen in Cyanobacteria.

Discussion

21.	Which is not a component of bacterial cell? (a) Mesosomes (b) Glycocalyx (c) Polysomes (d) Histones
Answer» (d) Histones

Discussion

22.	Define Genophore.
Answer» The bacterial chromosome is a single circular DNA molecule, tightly coiled and is not enclosed in a membrane as in Eukaryotes. This genetic material is called nucleoid or genophore.

Discussion

23.	What are polysomes?
Answer» During protein synthesis, the ribosomes are held together by mRNA and form the polysomes.

Discussion

24.	Which Gram negative bacterium caused Duodenal and Gastric ulcers? (a) Helicobacter Pylori (b) Helicobacter Vibrio (c) E.Coli (d) Haemophillus
Answer» (a) Helicobacter Pylori

Discussion

25.	The most abundant polypeptide in bacterial cell wall is..........(a) Chitin (b) Amylopectin (c) Porin (d) Pectin
Answer» The most abundant polypeptide in bacterial cell wall is Porin.

Discussion

26.	Write the chemical composition of bacterial cell wall.
Answer» The chemical composition of cell wall is rather complex and is made up of peptidoglycan or mucopeptide (N-acetyl glucosamine, N-acetyl muramic acid and peptide chain of 4 or 5 aminoacids).

Discussion

27.	Bacterial cell wall contains ______ . (a) peptidoglycan (b) glucose (c) flagellin (d) chitin
Answer» Bacterial cell wall contains peptidoglycan.

Discussion

28.	The term bacteria was first used by ______ . (a) Stanley (b) Pasteur (c) Hooke (d) Ehrenberg
Answer» The term bacteria was first used by Ehrenberg.

Discussion

29.	The cancer causing viruses are also called _____ . (a) Oncogenic viruses (b) Corona viruses (c) HIV (d) Mycoviruses
Answer» The cancer causing viruses are also called Oncogenic viruses.

Discussion

30.	Disease causing organisms are called as ______ . (a) organisms (b) pathogens (c) recipients (d) decomposers
Answer» Disease causing organisms are called as pathogens.

Discussion

31.	The study of Bacteria is called ______ . (a) Virology (b) Mycology (c) Physiology (d) Bacteriology
Answer» The study of Bacteria is called Bacteriology.

Discussion

32.	Bacterial photosynthesis differs from higher plants in evolution of ______ . (a) Oxygen (b) Hydrogen sulphide (c) Hydrogen (d) CO2
Answer» Bacterial photosynthesis differs from higher plants in evolution of Oxygen.

Discussion

33.	Food poisoning is caused by ______. (a) Yersinia (b) Clostridium (c) Treponema (d) Vibrio
Answer» Food poisoning is caused by Clostridium.

Discussion

34.	Who discovered plasmid ? (a) David (b) Koch (c) Joshua Lederberg (d) Griffith
Answer» (c) Joshua Lederberg

Discussion

35.	Griffith used ........ for his experiment. (a) rat (b) rabbit (c) mice (d) monkey
Answer» Griffith used mice for his experiment.

Discussion

36.	Who discovered the Transformation process? (a) Griffith (b) Ehrenberg (c) Pasteur (d) Hooke
Answer» The answer is (a) Griffith

Discussion

37.	What are the four characteristics of inflation?
Answer» Constant rise in price levels, Price rise in all sectors of economy, Purchasing power decreases and The rise in price level after full employment.

Discussion

38.	Griffith demonstrated Transformation in ______. (a) 1928 (b) 1930 (c) 1975 (d) 1900
Answer» Griffith demonstrated Transformation in 1928.

Discussion

39.	Transformation in bacteria was demonstrated by ______(a) Lederberg (b) Zinder (c) Edward (d) Griffith
Answer» Transformation in bacteria was demonstrated by Griffith.

Discussion

40.	What is suppressed inflation?
Answer» When government keeps control over and suppresses increase in price levels via. rules and subsidies, it is considered suppressed inflation even if there is technically no price rise.

Discussion

41.	What is the value of money during constant and steady price increase?(a) Increases(b) Decreases(c) Constant(d)Doesn’t change
Answer» Correct option is (b) Decreases

Discussion

42.	Mention the potential applications of fungi in agriculture.
Answer» Mycorrhiza forming fungi like Rhizoctonia helps in absorption of water and minerals. Fungi like Beauveria bassiana are used as biopesticides to eradicate crop pests. Gibberellin is a plant growth promoter produced by a fungus Gibberella fujikuroi.

Discussion

43.

Distinguish Prokaryotic and Eukaryotic organisms.

Answer»

S.No.	Prokaryotic	Eukaryotic
1.	Unicellular organisms.	Unicellular or multicellular organisms.
2.	Lack membrane bound nucleus.	Definite mucleus is present bound by nuclear membrane.
3.	Organelles like mitochondria, endoplasmic reticulum are absent.	Organelles like mitochondria, endoplasmic reticulum are present.
4.	Eg : Amoeba.	Eg : Oedogonium.

Discussion

44.	In which of the following method genetic recombination does not occur? (a) Generalised transduction (b) Conjugation (c) Transformation (d) Fission
Answer» The answer is (d) Fission

Discussion

45.	What are Methanogenic bacteria?
Answer» The bacteria produce methane are called methanogenic bacteria.

Discussion

46.	______ are obligate aerobes. (a) Streptococcus (b) Clostridium (c) Micrococcus (d) E. Coli
Answer» Micrococcus are obligate aerobes.

Discussion

47.	What is the type of inflation when the government controls inflation via rules or laws?(a) Suppressed(b) Open(c) Galloping(d) Hidden
Answer» Correct option is (a) Suppressed

Discussion

48.	What is the economic system called that allows exchange of rice instead of clothes?(a) Monetary system(b) Banking system(c) Barter system(d) Loan system
Answer» Correct option is (c) Barter system

Discussion

49.

Differentiate between the following : (i) Growth in plants and growth in animals (ii) Growth in unicellular organisms and growth in multicellular organisms (iii) Catabolism and anabolism.

Answer»

(i) Growth in plants and growth in animals

Growth in plants	Growth in animals
Plants grow faster and continuously throughout their life span.	Animals grow slowly and after reaching certain size and age, animals stop growing.

(ii) Growth in unicellular organisms and growth in multicellular organisms

Growth in unicellular organisms	Growth in multicellular organisms
Growth can be observed in only in − vitro cultures.	Growth can be easily observed in in − vitro as well as in in − vivo.

(iii) Catabolism and anabolism.

Anabolism	Catabolism
The biochemical reactions which are concerned with the synthesis of complex substances from simple substances are collectively called anabolism. E.g., photosynthesis.	The biochemical reactions which are concerned with breakdown of complex organic substances into simple substances are collectively called catabolism. E.g., respiration.

Discussion

50.	Normally what is inflation?
Answer» Inflation is an economic problem which means increase in price levels of goods or services over a time period.

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

Which of the following is a combination and which is a displacement reaction ?(a) Cl2 + 2KI ——-&gt; 2KCl + I2 (b) 2K + Cl2 ——–&gt; 2KCl

In the following reaction between lead sulphide and hydrogen peroxide : PbS (s) + 4H2O2 (aq) ————-&gt; PbS04 (s) + 4H2 O (l) (a) Which substance is reduced ? (b) Which substance is oxidised ?

What type of chemical reactions are represented by the following equations ?1. A + BC ——- &gt; AC + B 2. A + B ——- &gt; C 3. X ——- &gt; Y + Z 4. PQ + RS —— &gt; PS + RQ 5. A2O3 + 2B —–&gt; B2O3 + 2A

What type of reactions are represented by the following equations ?(a) CaO + CO ———- &gt; CaCO3(b) 2Na + 2H2O —— &gt; 2NaOH + H2(c) Mg + CuS04 ——— &gt; MgSO4 + Cu(d) NH4 NO2 ——- &gt; N2 + 2H2O (e) CuS04 + 2NaOH ——– &gt; Cu(OH)2 + Na2 SO4

In the reaction represented by the following equation : CuO(s) + H2 (g) ————- &gt; Cu (s) + H2 0(1) (a) name the substance oxidised (b) name the substance reduced (c) name the oxidising agent (d) name the reducing agent

The reactants in the following word equation are _______.Zinc + Sulphuric acid → Zinc sulphate + Hydrogen(i) Zinc(ii) Zinc sulphate(iii) Sulphuric acid(iv) Hydrogen(A) (i) and (ii)(B) (i) and (iii)(C) (i) and (iv)(D) (ii) and (iv)

Balance the following chemical equation :Fe + H2O → Fe3O4+H2

An arrow pointing downwards in a chemical reaction shows ………………. A) Evolution of gas B) Formation of precipitate C) Oxidation D) Displacement

Name one reaction which is accompanied by the evolution of heat.

Give one example.Chemical reaction showing evolution of gas.

Identify the substances that are oxidized and that are reduced in the following equation.i) 4Na(s) + O2(g) → 2Na2O(s)ii) CuO(s) + H2(g) → Cu(s) + H2O(l)

Give one example.Change in substance's colour during a chemical reaction.

A student added aluminium pieces in ferrous sulphate solution taken in a test-tube. Write down the colour change she observed in the solution?

Write the chemical equation of the reaction with an example each in which the following change has taken place:(i) Change in colour(ii) Change in temperature (iii) Formation of precipitate.

Complete and balance the following chemical equation:(i) CaCO3 + HCl(ii) Al+HCl(iii) MnO2+HCl

Mention the function of Glycocalyx.

What are polysomes?

Genophore is seen in ..........(a) Amoeba (b) Cyanobacteria (c) Chlamydomonas (d) Euglena

Which is not a component of bacterial cell? (a) Mesosomes (b) Glycocalyx (c) Polysomes (d) Histones

Define Genophore.

What are polysomes?

Which Gram negative bacterium caused Duodenal and Gastric ulcers? (a) Helicobacter Pylori (b) Helicobacter Vibrio (c) E.Coli (d) Haemophillus

The most abundant polypeptide in bacterial cell wall is..........(a) Chitin (b) Amylopectin (c) Porin (d) Pectin

Write the chemical composition of bacterial cell wall.

Bacterial cell wall contains ______ . (a) peptidoglycan (b) glucose (c) flagellin (d) chitin

The term bacteria was first used by ______ . (a) Stanley (b) Pasteur (c) Hooke (d) Ehrenberg

The cancer causing viruses are also called _____ . (a) Oncogenic viruses (b) Corona viruses (c) HIV (d) Mycoviruses

Disease causing organisms are called as ______ . (a) organisms (b) pathogens (c) recipients (d) decomposers

The study of Bacteria is called ______ . (a) Virology (b) Mycology (c) Physiology (d) Bacteriology

Bacterial photosynthesis differs from higher plants in evolution of ______ . (a) Oxygen (b) Hydrogen sulphide (c) Hydrogen (d) CO2

Food poisoning is caused by ______. (a) Yersinia (b) Clostridium (c) Treponema (d) Vibrio

Who discovered plasmid ? (a) David (b) Koch (c) Joshua Lederberg (d) Griffith

Griffith used ........ for his experiment. (a) rat (b) rabbit (c) mice (d) monkey

Who discovered the Transformation process? (a) Griffith (b) Ehrenberg (c) Pasteur (d) Hooke

What are the four characteristics of inflation?

Griffith demonstrated Transformation in ______. (a) 1928 (b) 1930 (c) 1975 (d) 1900

Transformation in bacteria was demonstrated by ______(a) Lederberg (b) Zinder (c) Edward (d) Griffith

What is suppressed inflation?

What is the value of money during constant and steady price increase?(a) Increases(b) Decreases(c) Constant(d)Doesn’t change

Mention the potential applications of fungi in agriculture.

Distinguish Prokaryotic and Eukaryotic organisms.

In which of the following method genetic recombination does not occur? (a) Generalised transduction (b) Conjugation (c) Transformation (d) Fission

What are Methanogenic bacteria?

______ are obligate aerobes. (a) Streptococcus (b) Clostridium (c) Micrococcus (d) E. Coli

What is the type of inflation when the government controls inflation via rules or laws?(a) Suppressed(b) Open(c) Galloping(d) Hidden

What is the economic system called that allows exchange of rice instead of clothes?(a) Monetary system(b) Banking system(c) Barter system(d) Loan system

Differentiate between the following : (i) Growth in plants and growth in animals (ii) Growth in unicellular organisms and growth in multicellular organisms (iii) Catabolism and anabolism.

Normally what is inflation?

Which of the following is a combination and which is a displacement reaction ?(a) Cl2 + 2KI ——-> 2KCl + I2 (b) 2K + Cl2 ——–> 2KCl

In the following reaction between lead sulphide and hydrogen peroxide : PbS (s) + 4H2O2 (aq) ————-> PbS04 (s) + 4H2 O (l) (a) Which substance is reduced ? (b) Which substance is oxidised ?

What type of chemical reactions are represented by the following equations ?1. A + BC ——- > AC + B 2. A + B ——- > C 3. X ——- > Y + Z 4. PQ + RS —— > PS + RQ 5. A2O3 + 2B —–> B2O3 + 2A

What type of reactions are represented by the following equations ?(a) CaO + CO ———- > CaCO3(b) 2Na + 2H2O —— > 2NaOH + H2(c) Mg + CuS04 ——— > MgSO4 + Cu(d) NH4 NO2 ——- > N2 + 2H2O (e) CuS04 + 2NaOH ——– > Cu(OH)2 + Na2 SO4

In the reaction represented by the following equation : CuO(s) + H2 (g) ————- > Cu (s) + H2 0(1) (a) name the substance oxidised (b) name the substance reduced (c) name the oxidising agent (d) name the reducing agent