Chemistry - Questions and Answers, General Study (GK)

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Chemistry - Questions and AnswersPage 22

211.

The colour imparted by Co(II) compounds to glass is

(a)Green

(b)Deep blue

(c)Yellow

(d)Red

Comment

Answer is: BNA

212.

Stainless steel does not rust because

(a)Chromium and nickel combine with iron

(b)Chromium forms an oxide layer and protects iron from rusting

(c)Nickel present in it, does not rust

(d)Iron forms a hard chemical compound with chromium present in it

Comment

Answer is: BNA

213.

Which alloy contains Cu, Sn and Zn?

(a)Gum metal

(b)Solder

(c)Type metal

(d)Bronze

Comment

Answer is: ANA

214.

In blast furnace, iron oxide is reduced by

(a)Silica

(b)CO

(c)C

(d)Limestone

Comment

Answer is: BNA

215.

Which one the following material is very hard and very ductile?

(a)Carborundum

(b)Tungsten

(c)Cast iron

(d)Nichrome

Comment

Answer is: DNA

216.

Which one of the following is a transition metal?

(a)Aluminium (Al)

(b)Manganese (Mn)

(c)Magnesium(Mg)

(d)Calcium (Ca)

Comment

Answer is: BNA

217.

Which one of the following is the softest?

(a)Sodium

(b)Aluminium

(c)Iron

(d)Copper

Comment

Answer is: ANA

218.

Which among the following elements (metals) pollutes the air of a city having large number of automobiles?

(a)Cadmium

(b)Lead

(c)Chromium

(d)Nickel

Comment

Answer is: BNA

219.

The pares of metals , which evolves hydrogen, when treated with caustic soda solution , is

(a)Cu, Zn

(b)Hg, Au

(c)Al, Zn

(d)Ni, Al

Comment

Answer is: CNA

220.

Which one of the following is not an ore?

(a)Bauxite

(b)Pig iron

(c)Malachite

(d)Zinc blende

Comment

Answer is: BNA

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Chemistry - Questions and AnswersPage 22

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