Chemestry 10th & 9th Series 2018-19.docx

IQRA SCIENCE ACADEMY Chemistry Unit #4-5-6 Note: Write short answers of the following questions. (5  2=10)

II.

What is difference between bond pair and lone pair? Define chemical bond?

III.

Why metals are good conductor of electricity?

IV.

Give properties of ionic compounds?

V.

Define triple covalent bond with examples? SECTION – II

Note: Write short answers of the following questions.(5  2=10) I. II.

Define diffusion with example. Convert 500C into Kelvin.

III.

Define boiling point with one factor.

IV.

Define allotropy with an example.

V.

Give types of solids. SECTION – III

Note: Write short answers of the following questions. (5  2=10) I. II.

What is meant by ‘like dissolve like’? Define molarity with formula.

III.

What is super saturated solution?

IV.

Define allotropy with examples.

V.

Define saturated solution. SECTION – IV

Note: Attempt all long Questions.

(6X10=60)

1. Explain coordinate covalent bond with examples.

2. Discuss the effect of temperature on solubility. 3. Explain boiling point and its factors. 4. Explain hydrogen bonding in detail. 5. Explain vapour pressure and its factors. 6. Explain types of solutions with examples.

Time: 02:45 hr Marks: 90

SECTION – I

I.

9TH

9TH Time: 15 Mins Marks: 10 IQRA SCIENCE ACADEMY Chemistry (Ch # 4-5-6)

Objective

NAME: ____________

Roll No. _______

Date: __________

1. How many covalent bonds are present in𝑪𝟐 𝑯𝟐 ?

A. 2

B. 3

C. 4

D. 5

C. 𝑁2

D. 𝑂2

2. Which one is electron deficient? A. 𝑁𝐻3

B. 𝐵𝐹3

3. Total number of sharing electron in Nitrogen gas molecule is? A. 2

B.

4

C.

6

D.

8

B. 𝑁𝐻3

C. 𝑁2

D.

𝐵𝐹3

B. N-2m

C. N-2m-1

D. Nm

C. V/P

D. V/T

4. Which one is needed to complete its octet? A. 𝐻2 O 5. SI unit of pressure is? A. Nm-2

6. in Charles law K is equal to ? A. T/V

B. TV

7. By increasing temperature the rate of evaporation is? A. increased

B. decreased

C. become equal

D. not affected

8. The instrument used to measure the pressure in laboratory is? A. hydrometer

B. thermometer

C. manometer

D. barometer

C. alcohol

D. toluene

C. base

D. alcohol

9. Solution of common salt in water is called? A. brine

B. benzene

10. In aqueous solution, solvent is? A. water

B. acid