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بسم الله الرحمن الرحيم
BOARD OF SECONDARY EDUCATION KARACHI
S.S.C 1st ANNUAL EXAMINATION – 2025
CHEMISTRY (THEORY) PAPER-I
کیمسٹری (تھیوری) پیپر-1 (سائنس گروپ)
CLASS IX-X (SCIENCE GROUP)
A/B/1/10/III/150425/M
Max. Marks: 60
٦٠:کل نمبر
Time: 3 hours
وقت: تین گھنٹے
SECTION "A" (COMPULSORY)
MULTIPLE CHOICE QUESTIONS (MCQs) MARKS:12
Note: (i) Attempt all the parts of this section. (ii) Do not copy down the part of question. Write only the answer against the proper number of the part according to the question paper. (iii) Each part carries 1 mark.
1. Choose the correct answer for each from the given options:
(i) The number of moles equivalent to 8g of CO2 are:
* 0.15
* 0.18
* 0.21
* 0.24
(ii) Molecular mass of Nitric Acid (HNO3) is:
* 60 a.m.u.
* 50 a.m.u.
* 63 a.m.u.
* 62 a.m.u.
(iii) The branch of Chemistry in which purple iodine vapours appear when solid iodine is heated, is called:
* Environmental Chemistry
* Biochemistry
* Medicinal Chemistry
* Inorganic Chemistry
(iv) This isotope is used to stimulate heart beat in heart pace maker:
* Plutonium – 238
* Carbon – 14
* Cobalt – 60
* Phosphorous – 32
(v) All transition elements are:
* Gases
* Metals
* Non-metals
* Metalloids
(vi) When an electronegative element combines with an electropositive element, the type of bond form:
* Covalent bond
* Ionic bond
* Polar bond
* Coordinate covalent bond
(vii) The compound not soluble in water:
* NaCl
* C6H6
* KBr
* MgCl2
(viii) One atmospheric pressure is equal to:
* 10325 Pascal
* 106075 Pascal
* 10523 Pascal
* 101325 Pascal
(ix) Photosynthesis is a/an:
* Oxidation Reaction
* Redox Reaction
* Reduction Reaction
* Neutralization Reaction
(x) Hardness of metal is measured by:
* pH scale
* likert scale
* rector scale
* moh scale
(xi) Fluorine exists in the form of:
* Solid
* Liquid
* Gas
* All of these
Page # 2 Chemistry | Class IX-X
(xii) On heating, saturated solution of KCl, becomes:
* unsaturated solution
* super saturated solution
* diluted solution
* suspension
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