Questions of chemistry for SSC(Chapter 1-4)

Chapter One

States of Matter and Changes in Matter

Short Question.

1. What is sublimation? Write with examples. (CB-5, DB-2000, 04, JB-03, CB-02, 04) 2

2. What do you mean by melting point and boiling point of a substance? (DB-03) 2

3. What is metalloids? State its two examples. (DB-02, JB-02, RB-9) 1

4. Why does the same substance exists in shows different states at different temperature? (DB-02, JB-99, 02) 2

5. Explain what type of change occurs when candle is burnt. (DB-01) 2

6. What do you mean by intermolecular force? (RB-99, CB-2000, JB-05, CtgB-05) 1

7. What do you mean by metal and non-metal? State two examples for each of them. (CB-2000, RB-2000) 2

8. i) What is homogeneous mixture? Give example. (CB-5, CtgB-05) 1

ii) Write down four differences between a mixture and compound. (JB-04) 2

9.What is pure substance and combustion? Give two examples for each of them. (combustion means burning)(JB03,CtgB05) 2

10.State the type of the following change: (JB-03) 1´3=3

i) When a piece of iron is converted to a magnet.

ii) When photographic plate is exposed to light.

iii) When steam is passed over red hot iron bar.

iv) When iron piece / articles rusted. (DB-00)

11.What is the relation between melting and boiling point with that of intermolecular force(JB02) 2

12.i)What happens when electricity is passed through the acidified water? State the type of change.(JB-1

ii) Write down the names of different states of matter. What is intermolecular force? (RB-99) 2

13. State the type of change / What type of change will occur when rust is formed on iron substances? 2

14.Show that sugar solution is a homogeneous mixture? (CB-04) 2

15.Discuss with example the physical and chemical changes in matter. (JB-99) 2

16. Discuss saturated and unsaturated solution with example. (RB-01, CB-00, DB-99, RB02) 2

Broad Question

17.Write down the names of the different classification of matter. Why does the same matter change its state with the change of temperature. (RB-99, CB-02) 1+2=3

18. What is physical and chemical change? State six / four points of difference between them. (BB-05, RB-05, DB-05, DB-99, CB-01 JB-08) 1+2=3

19.Magnesium on burning increases its mass but candle on burning decreases its mass- Explain. (JB-03)

20. Discuss saturated and unsaturated mixture with example. (BB-01, CB-00, DB-99) 04

21. What is intermolecular force? Why the states of matter of a same compound changes with the change of temperature. (CB-02) 03

22. Explain the mechanism of electrolysis of acidified water. (CB-5) 03

Chemistry Questions

Chapter Two

Structure of Matter

Short Question

1. i) What is meant by chemical combination? State the law / Write down the Laws. (DB-04, JB-03) 2

ii) What is called the laws of chemical combination? (CtgB-05) 1

2. i) What is colloid? / What is colloid solution? (JB-01) 2

iii) What is meant by atomic mass unit? (DB-02) 1+1=2

3. State and explain the law of gaseous volume with according to the equation H₂+Cl₂ = 2HCl (RB-02, DB-01, CtgB-02, DB-05) 2

4. i) What do you mean by atomic mass and gram atomic mass? (DB-00, SB-99) 2

ii) What is meant by atomic mass and mass of one atom? (CtgB-03)pre08 2

5. Write down the limitations of Rutherfords atom model. (DB-00) 2

6. State and explain the Law of Multiple proportions. (RB-05, DB-00, JB-01, CB-04) 2

7. What is meant by Brownian movement? (DB-99, CB-03, 99, SB-04, CB-03, 99, RB-00)

8. Write down the four differences between atoms and molecules. (CB-00, 03, RB-00, 02, BB-01)JB08 2

9. i) What do you mean by atomic mass and molecular mass? (CB-00) 2

ii) Find out the molecular mass of Ca(HCO₃)₂. (CtgB-05) 1

10. State the law of conservation of mass. 2

11. What is Law of constant or definite proportion? Explain it. Write the Law with example. (RB-1, JB

02) 2

12. What is the value of one a.m.u in gram? 1

Find out the mass of one atom of Hydrogen? (RB-02) 1

13. What is diffusion? (JB-99, JB-05) 1

14. Describe an experiment regarding the process of diffusion or, Describe diffusion with a proper experiment. (DB-02) 2

15. What is meant by mole? Explain with examples. (CB-01) 2

16. i) Write the Law of reciprocal proportion. (CB-01, CtgB-05) 1

ii) Write the Law of Reciprocal proportion and explain with example. (JB-99, CB-00) 2

17. Write down the modern definition of molecular mass. (CtgB-04) 2

Broad Question

18. i) Write down the six postulates of Dalton's atomic theory. 2

ii) Write down the postulates of Dalton's atomic theory and discus its limitation. (RB-99) 3

19. What is meant by atom? Write two difference between atoms and molecules. (DB-04) 3

20. i) Write down the six postulates of Dalton's Atomic Theory. (CB-04) 3

ii) What are the postulates of Dalton's tomic theory? State the limitations. (DB-03, CB-04, RB-03, CB-02, CB-99) 2+1=3

21. State and explain the Law of reciprocal proportions with example. (DB-03, RB-03) 3

22. What are the Laws of chemical combination? / What is meant by Laws of chemical combination. How many they are? What are they? (DB-00, CB-01, RB-01) 3

23.What is diffusion? Explain. What is called the random movement of colloidal particles in a medium? Explain it from the Kinetic theory of molecules. 3

Or,

Explain Brownian movement with the help of kinetic theory of molecules.

24. N₂ & O₂ combine to form four compound. e.g. N₂O, NO, N₂O₃ and Nitrogen dioxide. Show this data supports which Law of chemical reaction. (BB-02) 3

25. N₂ and H₂ combine to form NH₃ where N₂=82.35%, in N₂O₃ N₂=22.58% and in H₂O₂ H₂=5.88% show that the data support the Law of reciprocal proportion. (SB-04) 4

26. In CS₂ ; C=15.75%, in SO₂, S=50% and in CO₂, C=27.2%. Prove which Law of chemical combination support this data value. (SB-04) 2

27.State the Law of Indestructibility of matter or conservation of mass and describe it with an experimental proof. (CB-99, DB-02, BB-04) 4

28. State and explain the Law of reciprocal proportion. (DB-99, CB-99) 4

29. Why John Dalton is regarded as the founder of modern chemistry? What are the postulates of Dalton's atomic theory? Write down the limitations of this theory. (JB-05, CB-01, BB-03, RB-05) 1+2+1=4

30. What are atoms and molecules? Write down their differences. (RB-04) 4

Mathematical Problem

31. Elements P and Q combines together to form four different compounds. Amongst them the compositions of P are 25%, 14.28%, 10% and 7.69% respectively. Show, which Law of chemical combination is supported by the data? (DB-05, CtgB-00, SB-05) 3

32. Of the two compounds composed of nitrogen and oxygen, the amount of the mass of oxygen are 36.4% and 69.6% respectively. Show that, the data supports the Law of multiple proportions. (SB-02)

33. Carbon and O₂ forms CO₂, where O₂=72.73%, in water O₂=88,89% and in CH₄, C=75%. Show, this data supports which Law of chemical combination. CtgB=02) 02

34. There are two copper oxides. The amount of Oxygen in the first and second Oxides are 20.12% and 11.19% respectively. Show that these data follow the Law of Multiple Proportions. (DB-01) 3

35. Ethane, Ethylene and acetylene are formed in combination from carbon and Hydrogen. The amount of Hydrogen in these compounds are 20%, 14.28% and 7.68% respectively. Show that this data supports the Law of Multiple Proportions. (CB-05, DB-99, CB-2, RB-99) 3

36. Carbon and Oxygen combine to form CO₂, in which the amount of Oxygen is 42.73%. The amount of Oxygen in water is 88.89%. In methane a compound of carbon and Hydrogen, the amount of Carbon is 75%. Show that this data supports the Law of Reciprocal Proportions. (CB-99, CB-02) 4

37. The amount of Carbon in Carbon di sulphide is 15.79, the amount of Sulphur is Sulphur di oxide is 50% and Carbon di Oxide contains 27.27% Carbon. Which Law of chemical combination is supported by this analytical data? (RB-3, BB-04, CtgB-05 3

38. Amongst 0.20 gm, 0.27 gm and 0.475 gm oxides of a metal there contains 0.12 gm, 0.162 gm and 0.285 gm metal respectively. Show that this data supports the Law of constant or definite proportion. (RB-00) 4

39. The following data were obtained by analysis of different samples of common salt. (JB-2000) 03 Mass of Common Salt Mass of Chlorine

(a) 2.30 gm 1.40 gm

(b) 5.71 gm 3.47 gm

(c) 8.19 gm 4.97 gm

Chemistry Questions

Chapter Three

Avogadro's Law

Short Question

1. What do you mean by Avogadro's number? What is its value? (DB-02, RB-02, CB-00, 04, DB-02, RB-03, JB-01)) 2

2. If the vapour density of steam is 9, find out the molecular formula of water. (DB-02) 2

3. What is the volume of 100 gm carbon di oxide at STP? (CB-02) 2

4. Write down the Avogadro's Law. State the importance of this Law. (CB-00) 2

5. What is the volume of 50 gm carbon di oxide at STP? (RB-05, CB-02, DB-03) 2

6. How many carbon atoms are there in 10 gm of diamond? (CB-02) 2

7. Find out the density of Nitrogen at STP. (CB-01) 2

8. If the density of a gas at STP is 3.954 g/L ; find out its molecular mass. (RB-00) 2

9. Write down the corollaries / deductions of Avogadro's Law. (BB-02) 2

10. What is molar volume? (SB-05, RB-03) 1

What is mole / What do you mean by mole. (CtgB-05) 1

11. Find out the density of Oxygen gas at STP. (CB-04, CtgB-03) 2

12. What is the number of molecule in two grams of water? (SB-03 JB-08) 2

13. What is meant by vapour density? (BB-04, 02) 1

14. i) What is standard temperature? (RB-99)1

ii) What do you mean by standard pressure. (JB-01) 1

Broad Question

14. i) Write and prove the Avogadro's third corollary / deduction / (Third Law) (DB-04), JB-05, CB05)

ii) Prove the Avogadro's second corollary. (RB-05) 2

iii) Prove the Avogadro's first corollary / deduction Law. (BB-02, 3

15. From Avogadro's Law prove that at the same temperature and pressure, the molar volume of all gases are the same and at standard temperature and pressure it is 22.4 Litres. (CB-04, RB-02, CtgB-99, 01, RB-03, JB-99, 04, CtgB-05) 4

16. Prove that, the molar volume at same temperature and pressure is 22.4 L. (DB-99, SB-05) 4

17. Prove that the molar mass of any gas is twice its vapour density. (CB-02, RB-02, DB-05) 3

18. "Except inert gases, the molecules of all elementary gases are di-atomic" prove the deduction with an example. (RB-99, CB-01) 3

19. What is Avogadro's Law? Explain why Hydrogen and Oxygen gas are diatomic? (SB, BB-01, 02) 4

20. From Avogadro's Law, Prove the second corollary / deduction. (RB-01, DB-03, JB-00, 04) 3

21. If the Atomic mass of Al is 27 what will be the mass of one atom of Aluminium. (CB-01) 3

Chemistry Questions

Chapter Four

Formula, Valency and Equation

Short Questions

1. What do you mean by structural formula? Write down the structural formulae of acetylene and Ammonia. (DB-04, 05, SB-03, CB-99) 1+1=2

2. i) What is meant by a structural formula and how it can be expressed. Write down the structural formulae of Pentane, Hydrazoic acid and C₂H₄. (JB-04, BB-04, RB-03, CB-02, JB-00, RB-05), Sulphuric acid (CB-02), Tetra bromo ethane (CtgB-01, 1,1 di iodo ethane (CtgB-01, Glycerine (CtgB-01), Hydrogen Cyanide (SB-04), Ammonia (SB-02), Acetylene (SB-02), Nitric acid (RB-05), HCl (SB-04, N₃H (SB-04),

ii) What is heavy water? (JB-01) 1

3. What is valence electron? (DB-02) 2

4. What do you mean by variable valency? Write with example. (RB-02, SB-02, DB-99) 2

5. Write down the four differences between empirical and molecular formula. (BB-05, SB-04, DB-05, BB, CB-03, RB-05, CB-05) test 08 2

6. Write the rules for writing symbols. (BB-05) 2

7. What is dormant valency? (BB-04, RB-4, DB-05) 1

8. Write down the differences between empirical formula and molecular formula. (CB-02, SB-02, 01, JB-99, DB-05) 2

9. Write down the rules for writing molecular formula of compounds. (DB-03) 2

10. i) Write the method for determining the molecular formula. (DB-03) 2

ii) Write down the rules for the determination of molecular formula from the empirical formula. (SB-01, DB-02, RB-02)

11. Write down the name and formula of a monovalent positive compound radical. (CB-01) 1

12. Define active and dormant valency. Write with example. (JB-03) 2

13. Find out the active and dormant valency of the following compounds. 2

(i) PCl₃ (Phosphorous trichloride (ii) SO₃ (Sulphur trioxide) (SB-02, CtgB-03, DB-05) 2

14. Write down the empirical and molecular formula of Benzene and glucose. (SB-04) 2

15. Write down the significance of H₂SO₄, HNO₃ and H₂O. (DB-03, DB-99, RB-04) 1´3=3

16. Write the two significance of HNO₃. (SB-04) 1

17. Write down the difference between valency and ions. (SB-01) 2

18. A compound contains 32.38% sodium, 22.57% sulphur and 45.05% oxygen. Find out its empirical formula. (CtgB-02) 2

19. i) Write the rules for determination of empirical formula from percentage composition. (CtgB-05) 2

ii) Write, how empirical formula can be determined from percentage composition of a compound. (SB-02) 2

20. i) Write the three quantitative significance of the reaction, C+O₂=CO₂. (CtgB-02) 2

ii) Write down the significance for the chemical equation. (DB-01, CB-01) 2

a) N₂+3H₂ = 2NH₃ (BB-05)

b) H₂+Cl₂ = 2HCl (DB-01, CB-01)

c) Zn+H₂SO₄ = ZnSO₄+H₂­ (SB-03, DB-03)

21. Find out the percentage composition of (i) H₂O (ii) Perchloric acid. (BB-01, DB-99, BB-04, DB-05) (iii) Glucose. (JB-5) 2

22. Write the formula of Ozone gas. (JB-2) 1

23. i) What is meant by radicals? (SB-01, BB-05) 1

ii) What are the differences between compounds and compound radicals. (CtgB-04) 2

24. Write down the formula of di-basic acid? What is di acidic base? (CtgB-04) 1

25. What is empirical formula? (SB-01) 2

26. What is radical? Write the symbol and valency of three radicals. (BB-01) 2

27. Write the symbol and valency of five radicals. (SB-02) 2

28. What is called composition? (JB-05) 1

Broad Questions

29. i) What is a chemical equation? Write down the significance for the chemical equation N₂ + 3H₂ 2NH₃ (SB-05, BB-05) 3

ii) Significance : 2H₂+O₂ = 2H₂O (DB-02, 01, CB-01) 2

30. What do you mean by maximum, active and dormant valency. (BB-02, CB-01, SB-99) 3

31. A compound contains 85.71% carbon, 14.29% Hydrogen and its vapour density is 28. Find out its Molecular formula. (RB-02, CB-99, CtgB-01, SB-01) 3

32. What is molecular formula? The empirical formula of glucose is CH₂O. Its molecular mass is 180. Find out the molecular formula of glucose. (JB-99) 3

33. A compound contains C=92.3% and Hydrogen=7.7%. Its molecular mass=78. Find out its molecular formula. (JB-01) 3

34. A compound contains 32.4% Sodium, 22.5% Sulphur and 45.1% Oxygen. Find out its simple emperical formula. (DB-02, JB-04) / A compound having (Na=32.4%, S=22.5% and the rest is O₂. Calculate its empirical formula) 3

35. A compound contains C=26.72%, H=2.24% and O=71.04%. Its vapour density is 45. Find out the molecular formula of the compound. (CB-03) 3

36. In the percentage composition of a Carbohydrate C=54.54%, H=9.09% and O₂=36.36%. Vapour density of the compound is 44. What will be its molecular formula? (CtgB=01) 2

37. In the percentage composition of glucose C=40% and H=6.67%. What will be its empirical formula? (SB-03) 2

38. A compound comtains C=32%, H=4% and O₂=64%. Its vapour density is 75. Find out its molecular formula. (SB-01, BB=05)pre08 4

39. A compound containing C, H and O₂ where H=2.24% and C=26%. The molecular mass of the compound is 90. Find out its molecular formula. (SB=03, RB=05) 2

40. In a compound of Carbon, Hydrogen and Oxygen the percentage of C=40% and H=6.67% respectively. The molecular mass of the compound is 180. Find out its moleculr formula. What is the name of the compound? (DB-01) 4

41. A compound contains 14.3% carbon, 1.19% Hydrogrn and the rest portion is chlorine. The vapour density of the compound is 84, find out its molecular formula. (JB-05) 3