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NAVY ANCHORAGE SCHOOL AND COLLEGE DHAKA
Model Test -01(2019)
Class: X
Subject: Chemistry (Creative)
Time: 2.35minutes Full marks: 50
[N.B – The figure in the right margin indicate full marks.Read the stem carefully and answer the associated
question. Answer any five question.]
1.
Elements Relative atomic
mass
Neutron number
A 14.01 7
B 24.31 12
C 35.45 18
(a) What is the oxidation number of a molecule? 1
(b) What do you meant by lone pair electron? 2
(c) Determine the position of A , B & C elements in the periodic table. 3
(d) Explain the dissolving mechanism of compound formed by B and C element 4
2. Observe the given stem and answer related question.
𝒊.𝑪 𝟐 𝑯 𝟔 + 𝟐𝑪𝒍 𝟐 → 𝑪 𝟐 𝑯 𝟒 𝑪𝒍 𝟐 + 𝟐𝑯𝑪𝒍
𝒊𝒊. 𝑴𝒈 + 𝒅𝒊𝒍𝒖𝒕𝒆 𝑯 𝟐 𝑺𝑶 𝟒 → 𝑴𝒈𝑺𝑶 𝟒 + 𝑯 𝟐
[Bond energy of 𝐶 − 𝐻, 𝐶𝑙 − 𝐶𝑙, 𝐶 − 𝐶𝑙 𝑎𝑛𝑑 𝐻 − 𝐶𝑙 are 414kj/mole, 244kj/mole,
326kj/mole and 431 kj/mole]
(a) What is the volume of 1 mole gas at STP? 1
(b) Explain that water is a polar compound. 2
(c) Determine the value of AH of reaction (i) 3
(d) Explain with logic that reaction (ii) is an electron transfer reaction. 4
3. Observe the given stem and answer related question.
(a) What is safonification? 1
(b) Explain 𝑁𝐻3 is a basic nature. 2
(c) Explains with cell reaction which occurred anode and cathode in the stem. 3
(d) Is it possible to produce electricity without salt bridge from avove cell? 4
4. Observe the given stem and answer related question.
X ( 78% in atmosphere) , Y ( 20.95% in amoshphere) [ X & Y are the symbolic term of elements]
(a) What is nucleon number? 1
(b) Why Helium takes position in 18 groups in a periodic table. 2
(c) Draw the molecular diagram of 𝑋2 and 𝑌2 molecule by using dot model. 3
(d) Analyze the bond formation of Y with a earth alkali metal. 4
Subject code - 137
[A, B, C are the symbolic term]

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5. Observe the given stem and answer related question.
(a) What is agricultural commodities? 1
(b) Why (NH4)2SO4 is widely used in agriculture? 2
(c) Which point of the graph indicates the boiling point the stem matter? Explain with cause. 3
(d) Explain the significance of the different points in the stem graph. 4
6. Observe the given stem and answer related question.
𝑖. 𝑆 + 𝑂2 → 𝑋
𝑖𝑖. 𝑁𝑂+ 𝑂2 → 𝑌
𝑖𝑖𝑖. 𝐶 + 𝑂2 → 𝑍
(a) What is distillation? 1
(b) What is the type of change of burning candle? Explain. 2
(c) Which gas diffuse first between X and Z gas of the stem? Explain it. 3
(d) Analyze the effect of X,Y and Z gas on environment. 4
7. 𝒊. 𝑲 𝟐 𝑪𝒓 𝟐 𝑶 𝟕, 𝑴𝒏𝑶 𝟒
−
, 𝑵𝒂 𝟐 𝑺 𝟒 𝑶 𝟔
𝒊𝒊. 𝑪𝑯 𝟒 + 𝑶 𝟐 → 𝑿 + 𝒀
(a) What is exothermic reaction? 1
(b) What do you mean by scientific research? 2
(c) Calculate oxidation number of Cr, Mn and S of the (i) no. stem. 3
(d) Analyze the reaction type of (ii) No. reaction. 4
8. Observe the given stem and answer related question.
i. 𝒊. 𝑪 𝟐 𝑯 𝟒 ( 𝒊𝒊) 𝑪𝑯 𝟑 𝑪𝑯 𝟐 𝑪𝑶𝑶𝑯 (𝒊𝒊𝒊) 𝑽𝒊𝒏𝒆𝒈𝒂𝒓
(a) What is the symbol of alkyl radical? 1
(b) Explain alkane is better than a alkene as fuel. 2
(c) How will you prove that compound (i) is an unsaturated hydrocarbon? 3
(d) Explain the conversion of (ii) to (i) compound and (i) to (iii) with equation. 4