CHEMISTRY QUESTION PAPERS

Class X ICSE
Subject - Chemistry
Answers to this Paper must be written on the paper provided separately.
You will not be allowed to write during the first 15 minutes.
This time is to be spent in reading the Question Paper.
The time given at the heat of this paper is the time allowed for writing the answers.
Section I is compulsory. Attempt any four questions from Section II.
The intended marks for questions or parts of questions are given in brackets [ ].
SECTION I (40 Marks)
Attempt all questions from this section
Question 1
a) Copy & complete the following table showing the trends of the various periodic properties? [5]
Periodic Property Trend along Group Trend along Period
1 Ionisation Energy A --------------------- A ---------------------
2 Electron Affinity B -------------------- B --------------------
3 Electronegativity C ---------------------- C ---------------------
4 Atomic Size D ---------------------- D ---------------------
5 Reducing Property E ------------------------ E --------------------
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b) What type of bonding takes place in the following compounds? [5]
i) Sodium Chloride ii) Carbon Tetrachloride
ii) Ammonia iv) Methane v) Calcium Oxide
c) Name the property in each case [5]
i) Salts when exposed to atmosphere, absorb moisture & become wet.
ii)The unique property by which elements link to each other either to form long chain or ring structure.
iii)The property by which metals can be drawn into wires.
iv) Salts, when exposed to atmosphere, absorb moisture & get converted into its saturated solution.
v) Hydrated salts, when exposed to atmosphere, loose their water of crystallization & crumble to form powder.
d) Three solutions A, B, C have PH 1, 6 & 13 respectively [5]
i) Which solution is strongly acidic ?
ii) Which solution is strongly alkaline ?
iii) Which solution contains both ions as well as molecules?
iv) Define neutralisation reaction for production of salt?
v) Write an example of amphoteric substance?
e) Write the name of organic compound which can fit into the description given below: [5]
i) Simplest hydrocarbon.
ii) Hydrocarbon containing only C-C single bond.
iii) Hydrocarbon containing at least one Carbon- Carbon double bond.
iv) Hydrocarbon containing at least one Carbon – Carbon triple bond.
v) Hydrocarbon which contributes towards green house effect.

Question-2 (10)
(a) From the list of chemicals given below select one chemical at a time for the description given from i to v
A) SO2 B) Cu0 C) H2SO4 D) ZnO E) NaOH
i) Acidic oxide?
ii) An alkali?
iii) An amphoteric oxide?
iv) An oxy acid?
v) A basic oxide?
(b) State Gay Lusacs Law?
c) Define or explain with examples:
i) Normal salt?
ii) Double salt?
iii) Acidic Salt?
iv) Basic salt?
d) Complete the sentence choosing the correct word/s from those given in brackets. (5)
i. The properties of the elements are a periodic function of their ____________ [atomic number, mass number, relative atomic mass.]
ii. Moving across a ________ of the Periodic Table the elements show increasing ________ character [group, period, metallic, non-metallic]
iii. The element at the bottom of a group would be expected to show _____________ metallic character than the element at the top [less, more]
iv. The similarities in the properties of a group of elements is because they have the same _________ [electronic configuration, number of outer electrons , atomic numbers.]
e) Write an IUPAC names of following compounds: [4]
v. i) C3H6 ii) C2H4 iii) C2H2 iv) CH3OH
vi. v) C2H5OH vi) CH3COOH vii) CHCl3 viii) C2H5Br
f) Define ionization potential. (2)
g) 200 cm3 of CO is mixed with 200 cm3 of O2 at room temp. and ignited . Calculate the vol. of CO2 formed on cooling to RT. (2)
3. Explain why [5]
(i) Metals are electropositive in nature?
(ii) Carbon tetrachloride is a nonelectrolyte?
(iii) Sulphur dioxide is called as anhydride of an acid?
(iv) Common salt becomes wet during rainy season?
(v) Chlorine displaces iodine from potassium iodide
4. A mixture of 10 cm3 of CO , 60 cm3 of H2 and 25 cc. of CH4 are mixed with 750 cm3 of air (containing 20% oxygen ) and ignited . Calculate the composition of the resultant mixture on cooling to room temp. (2)
5. Give reason- ( 6)
1. Atomic size of an element depends on the nuclear charge of that element.
2.A molecule of methane has four single covalent bond.
3. Give reason with equations wherever required , why sulphuric acid is a dibasic acid.
6. Q. 4 Name them: (5)
7. Q. 8 Choose the correct answer: (5)
(a) Elements of group 3 to 12 are known as:
i) Normal elements ii) Transition elements iii) Halogens iv) Actinides
(b) Aluminum and phosphorous belong respectively to groups:
i) 10 and 12 ii) 13 and 15 iii) 10 and 15 iv) 12 and 13
(c) Ionization potential:
i) Goes up and down ii) Decreases iii) Increases
(d) Electron affinity of the elements in groups 1 to 7:
i) Goes up and then down ii) Increases iii) Decreases and then increases iv) Decreases
(e) Atomic size:
i) Decreases ii) increases iii) remains the same iv) Sometimes increases and sometimes decreases.
. 8. The element of one short period of the Periodic Table are given below in order from left to right :- Li, Be, B, C, O, F, Ne. (4)
i. To which period do these elements belong. Which is the missing element and where should it be placed.
ii. Which element exhibits catenation. Place the element F, Be & N in order of increasing electronegativity.
b)Choose appropriate words from the following list & fill in the blanks I to VI below: ( anions, anode, cathode, cations, electrode, electrolyte, nickel, voltameter, dilute sulphuric acid) (5) To electroplate an article wit h nickel requires an (i) ------------ which must be a solution containing (ii)------------ions and a small amount of (iii)---------------. The article to be plated is placed as the (iv) ----------------- of the cell in which the plating is carried out. The (v)---------- of the cell is made from pure nickel. The ions that are attractd to the negative electrode & discharged are called (vi)-----