Practice Pakistan's most useful MCQs for competitive exams

The melting points and boiling points upto meddle of 3d- series ____________________?

• (A)  increases
• (B)  decreases
• (C)  remain same
• (D)  no regular trend

Answer

Submitted By :Ali Uppal

The leements in which d or f orbitals are in the process of completion are__________________?

• (A)  outer transition elements
• (B)  inner transition elements
• (C)  typical transition elements
• (D)  transition elements

Answer

Submitted By :Ali Uppal

Group VIB of transition elements contains___________________?

• (A)  Zn Cd Hg
• (B)  Fe Ru Os
• (C)  Cr Mo W
• (D)  Mn Te Re

Answer

Submitted By :Ali Uppal

Coordination number of the transition element in [Pt Cl NO2 (NH3)4]2- is____________________?

• (A)  2
• (B)  6
• (C)  4
• (D)  8

Answer

Submitted By :Ali Uppal

The reduction potential Zn is_________________?

• (A)  0.76
• (B)  -0.76
• (C)  -0.55
• (D)  0.55

Answer

Submitted By :Ali Uppal

In K2Cr2O7 the oxidation number of chromium is____________________?

• (A)  7
• (B)  6
• (C)  -7
• (D)  -6

Answer

Submitted By :Ali Uppal

Apparent charge on atom in molecule is___________________?

• (A)  valency
• (B)  coordination number
• (C)  oxidation number
• (D)  charge number

Answer

Submitted By :Ali Uppal

In alkaline battery the anode is made up of______________________?

• (A)  MnO2
• (B)  Zn
• (C)  AgO2
• (D)  cadmium

Answer

Submitted By :Ali Uppal

Density of H2SO4 in lead accumulator is__________________?

• (A)  1.25g/cm3
• (B)  1.3g/cm3
• (C)  1.20g/cm3
• (D)  1.15g/cm3

Answer

Submitted By :Ali Uppal

With impurities like P and S the open hearth furnace is lined with ?

• (A)  SiO2
• (B)  Fe2O3
• (C)  FeO
• (D)  CaO MgO

Answer

Submitted By :Ali Uppal