Chemistry Multiple Choice Questions Set – 3

Question 1.

The first metal used by man was

A. iron
B. copper
C. gold
D. bronze

Ans: B. copper

Question 2.

The gas used for artificial ripening of green fruit is

A. ethylene
C. carbon dioxide
D. acetylene

Ans: A. ethylene

Question 3.

The iron ore magnetite consists of

A. Fe2O3
B. Fe3OH4
C. FeCO3
D. 3Fe2O3 .3H2O

Ans: A. Fe2O3

Question 4.

The metal does not give H2 on treatment with dilute HCL is

A. Zn
B. Fe
C. Ag
D. Ca

Ans: C. Ag

Question 5.

The hydronium ion is

A. H+
B.HO –
C. H2+
D. H3O+

Ans: D. H3O+

Question 6.

Zone refining is used for the purification of

A. Au
B. Ge
C. Ag
D. Cu

Ans: B. Ge

Question 7.

The ionisation energy of hydrogen atom in the ground state is x KJ. The energy required for an electron to jump from 2nd orbit to 3rd orbit is

A. 5x/36
B. 5x
C. 7.2 x
D. x/6

Ans: A. 5x/36

Question 8.

The number of g-molecule of oxygen in 6.02 x 1024 CO molecules is

A. 1 gram of molecule
B. 0.5 gram of molecule
C.5 gram of molecule
D. 10 gram of molecule

Ans: C.5 gram of molecule

Question 9.

The most electropositive elements among the following is

A. Na
B. Ca
C. K
D. Cs

Ans: D. Cs

Question 10.

The main chemical constituent of the oil of cardamom which is responsible for flavour of this oil is

A. cineole
B. engenol
C. geraniol
D. limonene

Ans: A. cineole

Question 11.

The major constituent of air is

A. carbon dioxide
B. nitrogen
C. oxygen
D. hydrogen

Ans: B. nitrogen

Question 12.

The most extensive, commercially useful source of thorium as monazite sand occurs in India at

A. Orissa coast
B. Travancore coast
C. West Bengal coast
D. Gujarat coast

Ans: B. Travancore coast

Question 13.

The method that cannot be used for removing permanent hardness of water is

A. adding sodium carbonate
B. distillation
C. adding caustic soda
D. boiling

Ans: D. boiling

Question 14.

The molecule which has the highest percentage of ionic character among the following is

D. HBr

Ans: B. HF

Question 15.

The main chemical constituent of clay is

A. silicon oxide
B. aluminium borosilicate
C. zeolites
D. aluminium silicate

Ans: D. aluminium silicate

Question 16.

The main active constituent of tea and coffee is

A. nicotine
B. chlorophyll
C. caffeine
D. aspirin

Ans: C. caffeine

Question 17.

The following are the half lives of four active isotopes. Which one of the following is the most dangerous to handle?

A. 3 billion years
B. 100 years
C. 0.01 minute
D. 13 days

Ans: C. 0.01 minute

Question 18.

The high reactivity of fluorine is due to

A. its high electro negativity
B. small size of fluorine atom
C. availability of d-orbitals
D. strong F – F bond

Ans: A. its high electro negativity

Question 19.

The mineral containing both magnesium and calcium is

A. magnesite
B. calcite
C. carnallite
D. dolomite

Ans: D. dolomite

Question 20.

The maximum number of isomers for an alkene with molecular formula C4H8 is

A. 5
B. 4
C. 2
D. 3

Ans: B. 4

Chemistry GK MCQs all set

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