MULTAN BOARD
Chemistry (New Scheme)
(Session: 2022)
(Group-1 / A-2022)
SSC (Part-II)
Class – 10th
New Scheme
Time: 15 Minutes
(OBJECTIVE)
Marks: 12
Note: Write answers to the questions on the objective answer sheet provided. Four possible answers A, B, C & D are given for each question. Select the correct answer and fill in the corresponding circle A, B, C, or D on the provided answer sheet using a marker or pen.
- Nitrogen and hydrogen were reacted together to make ammonia Kc = 2.86mol/dm³. What will be present in the equilibrium mixture?
A) NH₃ only B) N₂, H₂ & NH₃ C) N₂ & H₂ only D) H₂ only - The conjugate base of HPO₄²⁻ is:
A) HPO₃⁻ B) HPO₄³⁻ C) PO₄³⁻ D) H₂PO₄⁻ - Which one of the given is not a fossil fuel?
A) Coal B) Natural gas C) Biogas D) Petroleum - The functional group -COOH is found in:
A) Carboxylic acids B) Aldehydes C) Alcohols D) Esters - Oxidation of alkenes produces:
A) Glyoxal B) Oxalic acid C) Formic acid D) Glycol - Photosynthesis process produces:
A) Starch B) Cellulose C) Sucrose D) Glucose - Earth’s atmosphere comprises 99% by volume of two gases. They are:
A) Nitrogen and ozone B) Nitrogen and oxygen C) Carbon dioxide & oxygen D) Argon & oxygen - Which is not an air pollutant?
A) NO₂ B) SO₂ C) CO D) N₂ - Depending upon temperature variation, the atmosphere is divided into how many regions?
A) One B) Two C) Four D) Three - Water dissolves non-ionic compounds by:
A) Ion-ion forces B) Ion-dipole forces C) Dipole-dipole forces D) Hydrogen bonding - A disease that causes bone and tooth damage is:
A) Fluorosis B) Hepatitis C) Cholera D) Jaundice - Crude oil is heated in the furnace up to:
A) 300°C B) 350°C C) 400°C D) 450°C
SECTION I: SHORT ANSWER QUESTIONS
Write short answers of any FIVE parts.
(5×2 = 10)
- Write two macroscopic characteristics of a reverse reaction.
- Why is the equilibrium state attainable from either direction?
- How is an alcoholic functional group identified?
- Justify that organic compounds are used as food.
- What is a ketonic group? Write down the formula of acetone.
- Write down the dot and cross formulae of propane and n-butane.
- Where are proteins found?
- Why are the ten amino acids essential for us?
Write short answers to any FIVE parts.
(5×2 = 10)
- Define Lewis acid and Lewis base.
- Define pH. What is the pH of pure water?
- Differentiate between saturated and unsaturated hydrocarbons.
- Why are alkanes called “Paraffins”?
- What is roasting?
- Write the difference between crude oil and residual oil.
- Write two uses of diesel oil.
- Write the raw materials used in the preparation of urea.
Write short answers of any FIVE parts.
(5×2 = 10)
- How does acid rain increase the acidity of the soil?
- Write two different sources of air pollutants.
- Write any two effects of global warming.
- What is the ozone hole? Where was it noticed for the first time?
- What is cryptosporidium? What are its symptoms?
- How is temporary hardness removed by Clark’s method?
- What is the value of the heat capacity of water? How is it essential for us?
- Write any two methods of prevention from waterborne diseases.
SECTION II: SUBJECTIVE QUESTIONS
Attempt any two questions.
Q5:
(a) What are amino acids? Explain that amino acids are the building blocks of proteins.
(b) Write down any four macroscopic characteristics of dynamic equilibrium.
Q6:
(a) What is the auto-ionization of water? How is it used to establish the pH of water?
(b) Explain water pollution caused by industrial waste.
Q7:
(a) What is petroleum? Describe any three fractions of petroleum.
(b) Describe halogenation of alkanes in diffused sunlight.