Science Chemistry MCQ Railways,UPSC,IAS,SSC,MPSC,KPSC,NCERT

General Science Chemistry MCQ-6

During the evaporation of a liquid

(A) the enthalpy decreases
(B) the enthalpy increases
(C) the Internal energy decreases
(D) the enthalpy remains unchanged

When a lead storage battery is discharged

(A) SO2 is evolved
(B) lead is formed
(C) lead sulphate is formed
(D) Sulphuric acid is consumed

The total number of lanthanide elements is

(A) 8
(B) 32
(C) 14
(D) 10

The colour imparted by /’Co(ll) compounds to glass is

(A) green
(B) deep blue
(C) yellow
(D) red

Consider the following statements Roasting is carried out to
1 . convert sulphide to oxide and sulphate.
2 . remove water of hydration.
3 . melt the ore /
remove arsenic and sulphur impurities Of these statement

(A) 1, 2, 3 are correct
(B) 1 and 4 are correct
(C) 1, 2 and 4 are correct
(D) 2, 3 and 4 are correct

During isothermal expansion of an ideal gas, its

(A) enthalpy reduces to zero
(B) enthalpy decreases
(C) internal energy increases
(D) enthalpy remains unaffected

Anode mud is a

(A) mixture of impure metals like Fe
(B) S02 gas
(C) mixture of Ag, Au, Pt
(D) None of the above

What is the correct increasing order of electro negativity for the most common oxidation states among the following elements?

(A) F < 0 < N < C
(B) 0 < N < C < F
(C) C < N < F < 0
(D) C < N < 0 < F

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

Aluminum is more reactive than iron but Aluminum is less easily corroded than iron, because

(A) oxygen forms a protective oxide layer
(B) it is a noble metal
(C) iron undergoes reaction easily with water
(D) iron form ions

Which law of the thermodynamics introduces the concept of entropy?

(A) Second law
(B) Zero th law
(C) Third law
(D) First law

On the basis of position in the electrochemical series, the metal which does not displace hydrogen from water and acid is

(A) Al
(B) Pb
(C) Ba
(D) Hg

In Periodic Table, metallic elements appear

(A) in the left-hand columns
(B) in the top rows
(C) in the right-hand columns
(D) in the bottom rows

Which alloy contains Cu, Sn and Zn?

(A) Gun metal
(B) Solder
(C) Type metal
(D) Bronze

Which one of the following metals is extracted through alloy formation?

(A) Manganese
(B) Silver
(C) Nickel
(D) Lead

Combustion of a candle is

(A) physical change
(B) reduction reaction
(C) endothermic reaction
(D) exothermic reaction

Corrosion is basically an

(A) interaction
(B) union between two light metals and a heavy metal
(C) altered reaction in presence of H2O
(D) electrochemical phenomenon