CHEMISTRY SET-4

Question 1:

On exposure to moist air, copper gains a green coat on its surface due to formation of which one of the following compounds ?

Copper carbonate

Copper oxide

Copper sulphate

Copper nitrate

Question 2:

If a refrigerator’s door is kept open, then:

room will be cooled.

The room will be heated.

rooms may get cooled or heated depending upon the weather.

no effect

Question 3:

Which of the following reactions is an example of an exothermic reaction ?

Burning of natural gas

Respiration

The decomposition of vegetable matter into compost

All options are correct

Question 4:

When a spoon is to be electroplated with nickel the spoon is:

dipped in a nickel sulphate solution.

made anode and a pure nickel rod, the cathode.

made cathode and a pure nickel rod, the anode.

coated with nickel sulphate and dried.

Question 5:

Assertion (A)Copper metal with HCl liberates hydrogen.
Reason (R) Hydrogen is present above Cu in the reactivity series.
Codes

Both A and R are true and R is the correct explanation of A

Both A and R are true, but R is not the correct explanation of A

A is true, but R is false

A is false, but R is true

Question 6:

Silverware turns black after a period of time due to the formation of:

nitrate coating on silver.

sulphide coating on silver.

chloride coating on silver.

oxide coating on silver

Question 7:

Corrosion is basically an:

interaction

union between two light metals and a heavy metal.

altered reaction in presence of H2O.

chemical phenomenon.

Question 8:

Food cans are coated with tin but not with zinc because:

zinc is costlier than tin.

zinc has a higher melting point than tin.

zinc is more reactive than tin.

tin is more reactive than zinc

Question 9:

Which one among the following metals is prominently used in mobile phone batteries ?

Copper

Zinc

Nickel

Lithium

Question 10:

Match List I with List II.
List I List II
A. Most reactive alkali metal 1. F
B. Chemically most active Non-metal 2. Cs
C. Metal with maximum density 3. Hg
D. Transition metals is in liquid State 4. Os
Codes
A B C D

4 3 2 1

1 4 3 2

2 1 4 3

3 2 1 4

Question 11:

The elements of group in the Periodic table:

have similar chemical properties.

have consecutive atomic numbers.

are isobars

are isotopes

Question 12:

The alkali metals have relatively low melting point. Which one of the following alkali metals is expected to have the highest melting point?

Li

Na

K

Rb

Question 13:

Which one of the following represents the correct order of electron releasing tendency of metals?

Zn > Cu > Ag

Ag > Cu > Zn

Cu > Zn > Ag

Cu > Ag > Zn

Question 14:

The ability of an atom in a chemical compound to attract shared electron is termed as:

electron affinity

ionisation enthalpy

atomic attraction

electronegativity

Question 15:

Match List I with List II and select the correct answer using the codes given below the lists.
List 1 - list 2
A. Solder - 1. Iron and carbon
B. Brass - 2. Copper and zinc
C. Bronze - 3. Copper and tin
D. Steel - 4. Lead and tin
Codes
A B C D

1 2 3 4

4 2 3 1

1 3 2 4