CBSE
ADDITIONAL PRACTICE QUESTIONS
SCIENCE (086)
Time Allowed: 3 hours Max. Marks: 80
General Instructions:
i. This question paper consists of 39 questions in 5 sections.
ii. All questions are compulsory. However, an internal choice is provided in some
questions. A student is expected to attempt only one of these questions.
iii. Section A consists of 20 objective type questions carrying 1 mark each.
iv. Section B consists of 6 Very Short questions carrying 02 marks each. Answers to
these questions should be in the range of 30 to 50 words.
v. Section C consists of 7 Short Answer type questions carrying 03 marks each.
Answers to these questions should be in the range of 50 to 80 words.
vi. Section D consists of 3 Long Answer type questions carrying 05 marks each. Answer
to these questions should be in the range of 80 to 120 words.
vii. Section E consists of 3 source-based/case-based units of assessment of 04 marks each
with sub-parts.
Section A
Select and write the most appropriate option out of the four options given for each of the
questions 1 - 20. There is no negative mark for incorrect response.
Q.Nos. Questions Marks
1 A single displacement reaction is represented below. 1
PQ + R ----> PR + Q
Which of the following is true about the reactants and products?
Option Nature of R in product Stability of PR as compared to PQ
A cation more stable
B cation less stable
C anion more stable
D anion less stable
(a) A
(b) B
(c) C
(d) D
, 2 Some types of chemical reactions are listed below. 1
- decomposition
- combination
- displacement
- double displacement
Which two of the following chemical reactions are of the SAME type?
P) AgNO 3 + NaCl ---> AgCl + NaNO 3
Q) Mg + 2 HCl ---> MgCl2 + H2
R) CH4 + 2 O2 ---> CO2 + 2 H2 O
S) 2 KOH + H2 SO4 ---> K2 SO4 + H2 O
(a) P and Q
(b) Q and R
(c) R and S
(d) P and S
3 Neetu has two test tubes containing dilute hydrochloric acid and dilute 1
sodium hydroxide solution, but they are not labeled.
Adding which of the following solutions to the test tubes will help her to
identify the acidic and basic solution?
- vinegar
- baking soda
- sodium chloride
(a) vinegar
(b) baking soda
(c) sodium chloride
(d) (none of them)
4 Sonia has aqueous solutions of three salts, sodium acetate, sodium chloride 1
and ammonium chloride in three test tubes. The test tubes are not labeled.
On checking, she finds the pH of the solutions to be 4.6, 7.0 and 8.9.
Which of the following correctly matches the salts with their respective pH?
pH 4.6 pH 7.0 pH 8.9
P sodium acetate sodium chloride ammonium chloride
Q sodium chloride ammonium chloride sodium acetate
R ammonium chloride sodium acetate sodium chloride
S ammonium chloride sodium chloride sodium acetate
(a) P
(b) Q
ADDITIONAL PRACTICE QUESTIONS
SCIENCE (086)
Time Allowed: 3 hours Max. Marks: 80
General Instructions:
i. This question paper consists of 39 questions in 5 sections.
ii. All questions are compulsory. However, an internal choice is provided in some
questions. A student is expected to attempt only one of these questions.
iii. Section A consists of 20 objective type questions carrying 1 mark each.
iv. Section B consists of 6 Very Short questions carrying 02 marks each. Answers to
these questions should be in the range of 30 to 50 words.
v. Section C consists of 7 Short Answer type questions carrying 03 marks each.
Answers to these questions should be in the range of 50 to 80 words.
vi. Section D consists of 3 Long Answer type questions carrying 05 marks each. Answer
to these questions should be in the range of 80 to 120 words.
vii. Section E consists of 3 source-based/case-based units of assessment of 04 marks each
with sub-parts.
Section A
Select and write the most appropriate option out of the four options given for each of the
questions 1 - 20. There is no negative mark for incorrect response.
Q.Nos. Questions Marks
1 A single displacement reaction is represented below. 1
PQ + R ----> PR + Q
Which of the following is true about the reactants and products?
Option Nature of R in product Stability of PR as compared to PQ
A cation more stable
B cation less stable
C anion more stable
D anion less stable
(a) A
(b) B
(c) C
(d) D
, 2 Some types of chemical reactions are listed below. 1
- decomposition
- combination
- displacement
- double displacement
Which two of the following chemical reactions are of the SAME type?
P) AgNO 3 + NaCl ---> AgCl + NaNO 3
Q) Mg + 2 HCl ---> MgCl2 + H2
R) CH4 + 2 O2 ---> CO2 + 2 H2 O
S) 2 KOH + H2 SO4 ---> K2 SO4 + H2 O
(a) P and Q
(b) Q and R
(c) R and S
(d) P and S
3 Neetu has two test tubes containing dilute hydrochloric acid and dilute 1
sodium hydroxide solution, but they are not labeled.
Adding which of the following solutions to the test tubes will help her to
identify the acidic and basic solution?
- vinegar
- baking soda
- sodium chloride
(a) vinegar
(b) baking soda
(c) sodium chloride
(d) (none of them)
4 Sonia has aqueous solutions of three salts, sodium acetate, sodium chloride 1
and ammonium chloride in three test tubes. The test tubes are not labeled.
On checking, she finds the pH of the solutions to be 4.6, 7.0 and 8.9.
Which of the following correctly matches the salts with their respective pH?
pH 4.6 pH 7.0 pH 8.9
P sodium acetate sodium chloride ammonium chloride
Q sodium chloride ammonium chloride sodium acetate
R ammonium chloride sodium acetate sodium chloride
S ammonium chloride sodium chloride sodium acetate
(a) P
(b) Q
