Kerala Class 9 First Term Question Paper 2025 Chemistry

SET -A
E 906-Ch
SAMAGRA SIIIKSIIA KERALA
Summative Assessment —Term 1 2025-26
CHEMISTRY
Class : IX
Score 40
Time: I %Hours
F irst fifteen minutes are cool off time. Read the questions
carefully during this time.
Write the answers according to the instructions.
Consider the score while writing the answers.
Answeronl one uestion or uestionshavin choice.

[Answer all the questions from 1 to 4 . Each question carries 1 score.]
l. Find the relation and fill up guitably (l)
Planetary model Rutherford
Plum Pudding Model
2. A few statements are given (1)
(i) Mendeleev arranged elements in the increasing order of atomic mass.
(ii) Mendeleev designed periodic table on the basis of atomic number.
(iii) Mosley designed periodic table on the basis of atomic number.
(iv) There are 8 groups and 7 periods in the modern periodic table.
Find the correct statements and choose the correct answer from the following.
a) statements (i) and (ii) are correct only the statements(i) is correct
c) statements (i) and (iii) are correct d) statements (i) and (iv) are correct
3. Match the following. (1)

(X) Neils Bohr ) Gold foil experiment

(Y) William Crookes (q) Stationary energy levels

(Z) Rutherford ( ) Discharge tube experiment

(s) Neutron

Choose the correct answer.
Y z
q r P
b) q S
c) P s
d) P s

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4. Assertion (A) : The element sodium at the extreme left of the third period form an
ionic compound with chlorine.
Reason(R): Electron gain enthalpy is high for 17thgroup elements. (1)
A and R are correct, but R is not the correct explanation of A
b. A and R are correct, R is a correct explanation of A
c. A is correct, but R is not correct.
d. A is not correct but R is correct.
Two questions from 5 to 11 have choice. Each question carries 2 scores. (7x 2 =14)

5. Magnesium is an alkaline earth metal.
a) How is magnesium ion formed? (1)
b) Write the chemical equation of its formation. (1)
6. (A). Electron configuration of four elements are given. (Symbols are not real)
R-2,f
a) Which of these elements belong to the same group? (1)
b) Which of these elements belong to the same period? (1)
OR
VB Electron configuration of four elements are given. (Symbols are not real)
C- up-2,5
a) Which among these is a noble gas?
b) Which is the 15th group element? (1)
7. Complete the table (2)

Isotope Use
a) Cobalt-6() a).......

b) ....... 2..2...!..1.. To diagnose anaemia

8 A. On the basis of discharge tube experiment, how did J.J Thomson prove the
following. ?
a) Cathode rays have mass. (1)
b) Cathode rays have negative charge. (1)
OR
B. On the basis of discharge tube experiment, how did J.J Thomson prove the
following?
a) Particles in the cathode rays are present in all substances. (1)
b) Cathode rays travel in straight lines. (1)

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9. The atom of element X has electrons in 3 shells . The number of valence
electrons is 6.
a) Write the electron configuration of this element. (1)
b To which family of elements does it belong? (1)

10. Symbols of some elements are given.
16 40 17 40 24
o, o Ca Mg ,
8 19 8 20 12

a) Select the pair of isobars. (1)
b) Write the reason for selecting this pair. (1)
11. The element Q belongs to the third period and thirteenth group of the periodic table.
a) Write the electron configuration of the noble gas in the same period. Q'141)
b) Write the atomic number of the element in the second period and that
belongs to the same group as that of Q. (1)
Two questions from 12 to 17 have choice. Each question carries 3 scores.
12. Write any three main postulates of Rutherford's model of atom. (3)
13. In scandium, last electron is added to penultimate shell and its electron
configuration is 2,8,9,2.
a) Write the electron configuration of the element that comes just before scandium
and the element that comes after scandium. (2)

b) Find the group number of scandium on the basis of electron configuration
of the element that comes just before scandium. (1)

14. A. a) Why do transition elements show similarity in groups and periods? (1)
ive examples for two transition elements that we use in our daily life? (2)
OR
B. a) In which groups are the main groups elements included ? (1)
b) Write one example each for the following from main group elements.
(i) Exists in solid state at room temperature.
(ii) Exists in liquid state at room temperature. (1)
15. Atomic number of some elements are given below. (Symbols are not real)
A- 12, B-15, C-17
a) Arrange them in the Increasing order of the size of atom. (1)
b) Justify your answer. (1)
c) How does the size of atom change on moving down the group? Give reason. (1)
16. CaO is an ionic compound. Atomic number of calcium is 20 and that of oxygen is 8.

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n) Wtltc the chemical equation for the formation of oxidc ion.
b) Identify the noble gas having the same electron configuration as that
of oxide ion.
(l)
(Xi 110"' tuany electrons and protons arc prcscnt in calcium ion?
17. A. Atotnic nutnber of an clement is 16.
a) In how many shells are electrons distributecf?
tnong these shells which has the highest energy? Give reason. (2)

OR
B. Atotnic nunlber of an eletnent is 15.
a) Which is the valence shell of this atom. ?
b) Which shell has the least energy in this atom? Give reason. (2)

Question 18 has one choice. It carries 4 scores
I S. A. Data ofsome elements X, Y and Z are given. (Symbols are not real)
X —Belongs to 3rdperiod and it needs I more electron to attain octet electron
configuration.
.Y —Belongs to 4thperiod. It is not a transition element. The shell with highest
energy contains I electron.
Z —Belongs to I st period and has the same number of valence electrons as that of Y.
a) Write the electron configuration of X and Y. (2)
b) Identify the element Z from the periodic table. (1)
c) Which is the isotope of Z having no neutron ? (1)
OR
B. Data of some elements P,Q and R are given. (Symbols are not real)
P —Belongs to Yd period. It contains 4 electrons more than that of neon.
Q —Group number is 13 and its penultimate shell is K shell.
R—Belongs to 2ndperiod and in the same group of P.
a) Write the electron configuration of P and Q. (2)
b) Identify the element R in the periodic table. (1)
c) Write the symbol of the radioactive isotope of R. (1)

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