# MCQs Of Chemistry 1st Year chapter 1 With Answers

MCQs of chemistry 1st year chapter 1 with answers are here for students of class 11 – This post contains 20 multiple choice questions of all the questions from chapter one of the first year chemistry more chemistry MCQs will come soon. explore our site for more subject-wise MCQs. Check out this comprehensive guide! It includes answers for all the questions in chapter one of your first-year chemistry chapter 1 stoichiometry MCQs. Get all your questions answered here! This post brings you solutions for all MCQs throughout chapter one of your Sindh text board curriculum. These stoichiometry MCQs will be helpful for students who want to pass the MDCAT and other medical university tests as well as other students who want to get high marks in class tests and board exams. chemistry MCQs for class 11 are most important for any type of test and exam You must practice these MCQs and learn to memorize, and solve these multiple-choice questions. chemistry is a vast subject and stoichiometry is a major topic of this interesting subject.

## MCQs Of Chemistry 1st Year Chapter 1 With Answers Let’s Get Started

#### Stoichiometry Chapter 1 MCQs

1 “Which one of the following has the same number of significant figures?”
A. 1.01 and 2.0
B. 6.02 × 10²³ and 2.0
C. 0.004 and 2.0
D.60 and 2.0

2 The mass of 6.02 × 10²⁴ atoms of sodium is.
A. 23grams
B. 230grams
C. 32grams
D. 11grams

3 The number of molecules of oxygen required to burn 2 × 10²⁰ molecules of ethane at STP is.
A. 2 × 10²⁰
B. 3.5 × 10²⁰
C. 6.02 × 10²³
D. 7 × 10²⁰

4 When 9 grams of water heated at 1.505 × 10²² molecules were consumed. The remaining No: of molecules of water is.
A. 3.8595 × 10²³
B. 1.505 × 10²³
C. 14. 3 × 10²²
D. None of these

5 A hydrocarbon contains 49% hydrogen. The mole ratio of carbon is.
A. 4.25
B. 4.45
C. 41.5
D. 4.34

6 The mass of oxygen in 9.8 grams of sulphuric acid is.
A. 1.6 g
B. 3.2 g
C. 8 g
D. 6.4 g

7 In methane the percentage of hydrogen by mass is.
A. 12%
B. 25%
C. 50%
D. 75%

8 The process of separating a liquid from solid sediments is called.
A. Distillation
B. Decntaction
C. Fractionation
D. Filtration

9 The process of converting a liquid into its vapors and then condensing the vapor back into liquid is called.
A. Distillation
B. Decntaction
C. Fractionation
D. Filtration

10 A substance that when added to another substance causes a chemical reaction is called.
A. Reactant
B. Product
C. Reagent
D. Emulsifier

11 Log 10 + Log 0.0001 =
A. -3
B. 3
C. 0
D. -1

12 Lack of handling of the apparatus causes.
A. Systematic error
B. Random error
C. Both a and b
D. None of these

13 Final zeros to the right of the decimal point are.
A. Significant
B. Non-significant
C. May or not be significant
D. None of these

14 The number of moles in 5.1 grams of NH3 is.
A. 0.2
B. 0.3
C. 3
D. 1.3

15 The number of moles in three grams of acetic acid is.
A. 0.01
B. 0.5
C. 0.05
D. 0.3

16 “Which of the following is an element.”
A. Water
B. Air
C. Cement
D. Ozone gas

17 New compounds are formed by.
A. Chemical change
B. Physical Change
C. Temporary change
D. None of these

18 The mass of carbon in 9 grams of glucose is.
A. 4.8 g
B. 7.2 g
C. 1.2 g
D. None of these

19 When an atom gains one or more electrons, forms.
A. Cation
B. Anion
C. Neutron
D. Proton

20 Which of the following measurements is more accurate?
A. 4.5 g
B. 4.56 g
C. 4.5678 g
D. 4.567 g