Subject Code: 1 3 7
BAF Shaheen College Dhaka
Practice Preparatory Test Examination-1: 2020 Class: X
(English Version)
Subject: Chemistry (Creative)
Time: 2 Hours 35 Minutes Full Marks: 50
[N. B. Read the stems carefully and answer the associated questions. Answer any five questions.]
1. X(g) + H2O(g) H3PO4
Y(l)
X is used as a monomer in the preparation of polyethylene.
a. What is gasohol? 1
b. Explain the preparation process of Nylon. 2 c. How can you prepare a saturated hydrocarbon from ‘X’? 3
d. It is possible to prepare an organic acid from ‘Y’ Analyze. 4 2.
Group
Period
8 16 17
3rd b
4th a c
a. What is coke? 1
b. Why H2SO4 is a dehydrating agent? 2 c. Discuss the extraction procedure of ‘b’ from its mine. 3
d. Analyze the reactions occur in the furnace during the metal ‘a’ extraction. 4
3. There are O = 53.33%. H = 6.67% in a compound having carbon, hydrogen and oxygen. The relative molecular mass of the compound is 60.
a. What is isomer? 1
b. Why solid ionic compound cannot conduct electricity? 2 c. Determine the molecular formula of the compound. 3
d. CCl4 can be produced from the stems compound Explain with equations. 4 4. The outer shell electronic configuration of X, Z and M elements are
Z and M both contain three energy levels. But X is an element which is situated in the 2nd period of the periodic table.
a. What is stoichiometry? 1
b. What is the volume of 10 NH3 molecules at standard condition? 2 c. Explain the element ‘M’ of the stem can show variable valency. 3
d. Compound consisting X and Z does not follow octet rule Explain. 4 60atm, 300C
5. Ca(HCO3)2
P(s) + Q(g) + H 2O(l)
a. What is BOD? 1
b. Why HNO3 is kept in brown bottle? 2 c. The above gas mentioned in the stem is acidic Explain. 3
d. By heating 75g of the above mentioned reactant 44g ‘p’ compound is obtained. Whether the reactant mentioned in the stem is analar or not? Give logic of your answer. 4 6.
Metal Ore
A Bauxite
C Celcoisite
[A and C are used symbolically]
a. What is universal indicator? 1
b. ‘Acid rain is the cause of extinction of many living beings’ Explain. 2 c. Describe the purification method of the metal C. 3
d. ‘The nitrate salt of elements ‘A’ and ‘C’ produces different colored precipitate when reaction occurs with aqueous solution of caustic soda’. Evaluate the statement. 4 7.
Element Electronic configuration of valence shell
R 2s2 sp5
Q 3s2 3p1
T 1s1
a. What is called metallic bond? 1
b. How can you prepare 250 ml 0.5 M Na2CO3 solution? 2
c. Explain the nature of the aqueous solution of chloride of Q element. 3
d. The compound which formed by the combination of R and T is soluble in water
Explain with logic. 4
8. ‘X’ is a hydrocarbon having two carbon and it has general formula CnH2n2. Y is an aldehyde which has also two carbon.
a. What is limiting reactant? 1
b. SO42 is a radical Explain. 2
c. How will you prove that ‘X’ of the stem is an unsaturated compound? Explain with
equation. 3
d. How ‘Y’ is prepared from ‘X’? Explain with equation. 4
