Chemistry - Mock Test 21

Question 201

List which contains only elements is ?

A) air, water, oxygen B) Hydrogen, oxygen, brass C) Air, water, fire, earth D) Calcium, Sulphur, carbon

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Question 202

Over 70% of earth's crust is covered with ?

A) water B) land C) coal D) trees

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Question 203

Mass of an atom relative to C-12 is ?

A) atomic mass B) atomic number C) nucleon number D) relative atomic mass

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Question 204

Relative atomic mass of Na is ?

A) 1.008 amu B) 22.9898 amu C) 26.9815 amu D) 15.9994 amu

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Question 205

A mole of any substance contains ?

A) 6.022 * 1022 particles B) 6.022 * 1023 particles C) 6.022 * 1024 particles D) 6.022 * 1025 particles

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Question 206

Mass number of an atom is ?

A) no. of protons B) no. of neutrons C) A and B both D) no. of electrons

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Question 207

Biochemistry deals with ?

A) physical changes in humans B) chemical changes in humans C) A and B both D) physical and chemical changes in living organisms

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Question 208

Ca on loosing 2 electrons becomes ?

A) Ca-2 B) Ca-1 C) Ca+2 D) Ca-2

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Question 209

If 9.05 moles of ozone is formed in a storm then mass of ozone is ?

A) 435g B) 450g C) 434.4g D) 480g

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Question 210

Natural force that holds together elements together is called ?

A) chemical bond B) force of attraction C) gravitational force D) physical bond

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