Olete.in – MCQs, Mock Tests & Government Job Prep | CBES Board Class 9 FUNDAMENTALS OF CHEMISTRY MCQS class 9 SET 2

The mass number of an atom is

1. number of protons only
2. number of neutrons only
3. number of electrons
4. number of protons and neutrons

✅ Correct Answer: 4

A mole of any substance contains

1. 6022 * 1022 particles
2. 6022 * 1023 particles
3. 6022 * 1024 particles
4. 6022 * 1025 particles

✅ Correct Answer: 2

The relative atomic mass of Na is

1. 1008 amu
2. 229898 amu
3. 269815 amu
4. 159994 amu

✅ Correct Answer: 2

The mass of an atom relative to C-12 is

1. atomic mass
2. atomic number
3. nucleon number
4. relative atomic mass

✅ Correct Answer: 4

Over 70% of earths crust is covered with

1. water
2. land
3. coal
4. trees

✅ Correct Answer: 1

The list which contains only elements is

1. air water oxygen
2. Hydrogen oxygen brass
3. Air water fire earth
4. Calcium Sulphur carbon

✅ Correct Answer: 4

The formula mass indicates the simplest ration between

1. cations only
2. anions only
3. atoms
4. cation and anions

✅ Correct Answer: 4

The smallest part of an element that cannot exist as a free state is

1. ion
2. charge
3. atom
4. molecule

✅ Correct Answer: 3

A free radical has

1. unpaired electrons
2. paired electrons
3. no electrons
4. even number of electrons

✅ Correct Answer: 1

Branch of chemistry dealing with the plantation and overcoming greenhouse effect is

1. Biochemistry
2. Organic chemistry
3. Environmental chemistry
4. Inorganic chemistry

✅ Correct Answer: 3

1 mole of a substance refers to

1. molar mass
2. atomic mass
3. electron mass
4. neutron mass

✅ Correct Answer: 1

The number of protons in the nucleus constitute its

1. atomic mass
2. atomic number
3. nucleon number
4. number of neutrons

✅ Correct Answer: 2

Compounds have atoms of

1. same sizes
2. different sizes
3. same electrons
4. different electrons

✅ Correct Answer: 2

An oxide ion has -2 charge because

1. oxygen looses two electrons
2. oxygen gains two electrons
3. oxygen becomes neutral
4. oxygen gains 3 electrons

✅ Correct Answer: 2

Which of the following is present in vinegar?

1. 10% acetic acid
2. 5%acetic acid
3. 7% acetic acid
4. 8% acetic acid

✅ Correct Answer: 2

The molecular formula gives

1. simplest ratio of atoms
2. actual whole number ratio of atoms
3. whole number ratio of atoms
4. natural number ratio of atoms

✅ Correct Answer: 2

6022 * 1023 atoms of Sulphur contains

1. 2 moles
2. 3 moles
3. 4 moles
4. 1 mole

✅ Correct Answer: 4

An ionic compound is electrically

1. neutral
2. positively charged
3. negatively charged
4. none of above

✅ Correct Answer: 1

Gram molecular mass of C6H12O6 is

1. 18016g
2. 180096g
3. 585g
4. 70g

✅ Correct Answer: 2

In glucose the simplest ratio between C H and O is

1. 840625
2. 126400463
3. 4306713
4. 127789352

✅ Correct Answer: 3

The formula mass of NaCl is

1. 575 amu
2. 585 amu
3. 595 amu
4. 600 amu

✅ Correct Answer: 2

Species present in a substance refers to

1. atoms
2. ions
3. molecules
4. representative particles

✅ Correct Answer: 4

If one mole of carbon contains x atoms then the number of atoms in 12g of Mg are

1. x
2. 05x
3. 2x
4. 15x

✅ Correct Answer: 2

A science that examines the material this universe contains and changes in them is called

1. Chemistry
2. Physics
3. Biology
4. Geography

✅ Correct Answer: 1

The molecular mass of glucose is

1. 180096 amu
2. 190096 amu
3. 181096 amu
4. 130096 amu

✅ Correct Answer: 1

Negatively charged ions are called

1. cations
2. anions
3. ion
4. none of above

✅ Correct Answer: 2

The number of atoms of hydrogen in 2 moles of NH3

1. 5 * 1023
2. 301 * 1023
3. 361 * 1024
4. 4 * 1023

✅ Correct Answer: 3

The number of atoms in 5 moles of nitrogen atom is

1. 301 * 1024
2. 41 * 1030
3. 39 * 1032
4. 5 * 1056

✅ Correct Answer: 1

The branch of chemistry which deals with a substance containing carbon is called

1. carbon chemistry
2. inorganic chemistry
3. organic chemistry
4. environmental chemistry

✅ Correct Answer: 3

The mass of 1 mole of sucrose is

1. 320g
2. 342g
3. 341g
4. 340g

✅ Correct Answer: 2

The matter is anything that occupies

1. space only
2. mass only
3. time
4. space and mass

✅ Correct Answer: 4

The formula which gives the simplest whole-number ratio of atoms is

1. empirical formula
2. molecular formula
3. chemical formula
4. actual formula

✅ Correct Answer: 1

The mass of carbon present in 44g of carbon dioxide is

1. 12g
2. 6g
3. 44g
4. 24g

✅ Correct Answer: 1

The substance which has a formula mass of 1335 amu is

1. MgCl2
2. S2Cl2
3. BCl3
4. AlCl3

✅ Correct Answer: 4

Cookies and bread rise due to

1. conversion of washing soda into CO2
2. conversion of H2O in to CO2
3. conversion of baking soda into O2
4. conversion of baking soda in to CO2

✅ Correct Answer: 4

A free radical has

1. odd number of electrons
2. even number of electrons
3. no electrons
4. none of above

✅ Correct Answer: 1

When halogens are exposed to sunlight they split up in to

1. atoms
2. ions
3. radicals
4. molecules

✅ Correct Answer: 3

The gram atomic mass of Zn is

1. 23g
2. 12g
3. 6354g
4. 5667g

✅ Correct Answer: 3

A substance whose all atoms have the same atomic number is

1. molecule
2. atom
3. element
4. ion

✅ Correct Answer: 3

A hydrogen atom is

1. 840% as massive as C-12
2. 10% as massive as C-12
3. 20% as massive as C-12
4. 30% as massive as C-12

✅ Correct Answer: 1

A balloon filled with 5g of hydrogen contains

1. 248 moles of H2
2. 348 moles of H2
3. 448 moles of H2
4. 5 moles of H2

✅ Correct Answer: 1

The number of protons and neutrons in the nucleus if the atomic number of an element is 17 and the mass number is 35 is

1. 17 and 18
2. 17 and 19
3. 17 and 20
4. 17 and 21

✅ Correct Answer: 1