SCF-CBSE-X- PERIODIC CLASSIFICATION OF ELEMENTS-BMT-02

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Time: 1Hr SCF-CBSE-X PERIODIC CLASSIFICATION OF ELEMENTS

Maximum Marks: 26

INSTRUCTIONS : 1. All the questions are compulsory. 2. The question paper consists of 16 questions and are divided into 4 sections, A, B ,C and D. 3. Question numbers 1 to 6 are in section A and are multiple choice questions. Where you need to select one correct option out of the given four. 4. Question numbers 7 to 10 are in section B and are Very Short Answer Type Questions. 5. Question numbers 11 to 14 are in section C and are Short Answer Type Questions. 6. Question numbers 15 & 16 are in section D and are Long Answer Type Questions. 7. Use of calculators are not permitted.

SECTION-A

1. Zinc granules were added to zinc sulphate, copper sulphate, aluminium sulphate and iron sulphate solutions as shown below. A student would observe the depostion of metal on zinc in beakers:

1) I and III 2) I and II 3) II and IV 4) III and IV. 2. A piece of granulated Zn was dropped into CuSO4 solution. After sometime, the colour of the

solution changed from: 1) Light green to blue 2) blue to colourless

3) light green to colourless 4) light green to light blue 3. 10 mL of freshly prepared FeSO4 solution was taken in each of four test tubes. Strips of Cu,

Zn, Al and Fe were introduced in different test tubes. Metal deposition was obtained in two of them.

The right pair of metals forming the precipitates is: 1) Cu and Zn 2) Al and Cu 3) Fe and Al 4) Zn and Al.

4. When Zinc plate dipped in ferrous sulphate solution is taken out after 15 minutes its surface is coated with a:

1) Blue coating 2) Grey coating 3) Reddish coating 4) Black coating.

SCF-CBSE-X- PERIODIC CLASSIFICATION OF ELEMENTS-BMT-02

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5. A student took solutions of CuSO4,ZnSO4 and FeSO4 in four test tubes and dropped pieces of zinc, copper and iron in each of them separately as shown in the figure:

In which of the above shown test tubes, change in colour of the solution would be observed? 1) I and II 2) II and III 3) II and IV 4) I and III 6. An iron nail is suspended in copper sulphate solution and kept for a while. It is observed that the

solution: 1) Remains blue and a coating is formed on the nail 2) Turns green and a coating is found on the nail 3) Remains blue and no coating is formed on the nail 4) Turns green and no coating is found on the nail.

SECTION-B

VERY SHORT ANSWER QUESTIONS (1mark) 7. What were the limitations of Newlands Law of Octaves? 8. Name two elements of first period in Modern periodic table. 9. An element has electronic configuration 2, 8, 6. Explain its position in the periodic table. 10. Nitrogen (atomic number 7) and Phosphorus (atomic number 15) belong to group 15 of the periodic

table. Which of these will be more electronegative and why?

SECTION-C

SHORT ANSWER QUESTIONS (2marks) 11. The following table by the letters A, B, C, D, E, F, G and H

Group 1 2 13 14 15 16 17 18 Element A B C D E F G H

(i) Which of the elements has the atomic size: (a) Biggest and (b) Smallest?

(ii) Which element has valency: (a) 3 and (b) zero? 12. Consider the part of periodic table given below and answer the following questions

Group / Period

1 2 13 14 15 16 17 18

I a j II b e g h k III c f i l IV d

(i) The atom of which element is smaller in size e or h?

(ii) Which element is most electropositive in nature? (iii) Which element has only one proton in its atom? (iv) How many valence electrons does g have?

SCF-CBSE-X- PERIODIC CLASSIFICATION OF ELEMENTS-BMT-02

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13. How does the tendency to gain electrons changes as we go down the 16th group of periodic table? Why?

14. State Modern period law. How many groups and periods are present in modern periodic table?

SECTION-D

LONG ANSWER QUESTIONS (4marks) 15. (a) Why did Mendeleev have gaps in his periodic table? (b) State any three limitations of Mendeleevs classification. (c) How does electronic configuration of atoms change in a period with increase in atomic number? 16. An element X (atomic number 17) reacts with an element Y (atomic number 20) to form a

compound. (a) In which group and period of modern periodic table the elements X and Y are present? (b) Classify X and Y as metal(s), nonmetal(s) or metalloids(s) (c) What will be the formula of oxide of element Y? Identify the nature of the bond between the two

elements in the oxide formed. (d) Draw the electron dot structures of the cation and anion formed when X reacts with Y.

*****END OF TEST PAPER****