Chemistry - Comprehensive Mock Test 16

Question 151 Medium

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

A) Biochemistry B) Organic chemistry C) Environmental chemistry D) Inorganic chemistry

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Question 152 Easy

A free radical has ?

A) unpaired electrons B) paired electrons C) no electrons D) even no. of electrons

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Question 153 Medium

Smallest part of an element that cannot exist as a free state is ?

A) ion B) charge C) atom D) molecule

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Question 154 Easy

Formula mass indicates simplest ration between ?

A) cations B) anions C) A and B both D) atoms

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Question 155 Easy

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 156 Easy

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

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

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Question 157 Easy

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 158 Easy

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 159 Easy

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 160 Easy

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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