General Science Chemistry MCQ-5

Which one of the following elements cannot displace hydrogen gas from a dilute acid?

(A) Zinc
(B) Copper
(C) Magnesium
(D) Iron

Which of the following is used in making ..ointment for curing skin disease?

(A) ZnCo3
(B) ZnSO4
(C) ZnO
(D) ZnS

In which of the following, the entropy decreases?

(A) Crystallization of sucrose from solution
(B) Rusting of iron
(C) Melting of ice
(D) Vaporization of camphor

Consider the following statements The electrochemical series helps
1 . in extraction of metals
2 . in protecting the metal from corrosion
3 . in comparing the reactivity of metals
Which of the above is/are true?

(A) Only 1
(B) Only 2
(C) 2 and 3
(D) 1, 2 and 3

Consider the following statements
1 . Technetium was the first element to be made artificially.
2 . The non-metals are poor conductors of heat and electricity.
3 . Hydrogen has a single positive change, like the alkali metals, but at room temperature, it is a gas that doesn’t act labeled a metal. Therefore hydrogen usually is a non-metal.
Which of the statements given above are correct?

(A) 1 and 2
(B) 2 and 3
(C) 1 and 3
(D) 1, 2 and 3

“925 fine silver” means an alloy of

(A) 7.5%Agand92.5%Cu
(B) 92.5% Ag and 7.5% Cu
(C) 80% Ag and 20% Cu
(D) 90% Ag and 10% Cu

MatchColumn I with Column II .
Column I(Metal) -Column II(Ore)
A . Aluminium 1 . Galena
B . Lead 2 . Bauxite
C . Copper3 . Pyrolusite
D . Manganese 4 . Chalcopyrite
Codes
ABCD

(A) 3 2 1 4
(B) 4 3 2 1
(C) 1 4 2 3
(D) 2 1 4 3

Consider the following statements
Statement I A thermally insulated vessel contains some water. If the vessel is shaken vigorously, the temperature of the water will rise.
Statement II In this process energy is given to the water.
Which one of the following is correct with reference to the above statements?

(A)      Both statement I and statement II are true and Statement II is the correct explanation of Statement I.
(B)     Both Statement I and Statement II are true and Statement II is not the correct explanation of Statement I.
(C) Statement I is true and Statement II is false.
(D) Both Statement I and Statement II are false.

When items or Jewellery made of metals such as copper or nickel are placed in a solution having a salt of gold, a thin film of gold is deposited by

(A) cooling to below 0 0 C
(B) heating above 100 0 C
(C) passing an electric current
(D) just keeping it for 10 min

The arrangement of Na, Rb, K, Cs in the increasing order of atomic radius is

(A) Rb < K < Cs < Na
(B) K < Na < Cs < Rb
(C) Na < Cs < K < Rb
(D) Na < K < Rb < Cs

An example of an oxide ore is

(A) bauxite
(B) malachite
(C) zinc blende
(D) galena

Which of the following is not an ore?

(A) Malachite
(B) Calamine
(C) Stellite
(D) Cerussite

Assertion (A) As solid changes to liquid and then to vapour state, entropy increases.
Reason (R) As going from solid to liquid and then to vapour state, disorder increases.

(A) Both A and R are individually true and R is the correct explanation of A.
(B) Both A and R are individually true, but R is not the correct explanation of A.
(C) A is true, but R is false.
(D) A is false, R but is true.

(in an electrochemical cell that functions ^s a voltaic cell

(A) electrons move from the cathode to \he anode
(B) electrons move through a salt-bridge
(C) electrons can move either from the cathode to the anode or from the anode to the cathode
(D) reduction occurs at the cathode

Which of the following pairs of elements is in the same period of the Periodic Table?

(A) Na, Ca
(B) Na, Cl
(C) Ca,CI
(D) Mg, Sb

The transition metal with least atomic number

(A) Os
(B) Zr
(C) Pt
(D) Ru

In the metallurgy of iron, when CaC0 3 is added to blast furnace, calcium ion appears as

(A) CaO
(B) metallic Ca
(C) gangue
(D) slag