Chemistry - Comprehensive Mock Test 22

Question 211 Medium

Elements which have properties of metals and non-metals are ?

A) amorphous B) crystalline C) metalloids D) none of above

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Question 212 Easy

Sodium metal is soft due to ?

A) weak metallic bond B) strong metallic bond C) large size D) small size

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Question 213 Medium

As we move across period from left to right, reactivity of metals with oxygen ?

A) decreases B) increases C) remains same D) zero

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Question 214 Easy

As we move across period electronegativity ?

A) decreases B) increases C) remains same D) becomes zero

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Question 215 Easy

On contact with oxygen, Rubidium forms ?

A) normal oxide B) per oxide C) super oxide D) none of above

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Question 216 Easy

Metals difficult to oxidize are called ?

A) weak metals B) strong metals C) noble metals D) none of above

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Question 217 Easy

Which one is the cofactor of carbonic anhydrase?

A) Cu B) Zn C) Fe D) Mg

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Question 218 Easy

Copper deficiency causes ?

A) Anaemia and damages to CNS B) Pellagra C) Xerophthalmia D) Influenza

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Question 219 Easy

pH value of water is ?

A) 4 B) 7 C) 12 D) 18

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Question 220 Medium

The number of electrons and neutrons of an element is 18 and 20 respectively. Its mass number is ?

A) 22 B) 2 C) 38 D) 20

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