Class 10 Metals And Non-metals CBSE Questions & Answers

Class 10 · Metals And Non-metals

This is online test 02 for CBSE class 10 Science Metals and Non-metals.. There are 15 questions in this test with each question having around four answer choices.

Questions & Answers

1
Dried fruit plastic bags sold in the marked are filled with
  • A
    Nitrogen gas
    Correct
  • B
    All of these
  • C
    Hydrogen gas
  • D
    Helium gas
2
\({{\rm{P}}_{\rm{4}}} + {\rm{NaOH}} + {\rm{3}}{{\rm{H}}_{\rm{2}}}{\rm{O}} \to {\rm{X + 3Na}}{{\rm{H}}_{\rm{2}}}{\rm{P}}{{\rm{O}}_{\rm{2}}}\) What does ‘X’ indicate here?
  • A
    \({{\rm{P}}_{\rm{2}}}{{\rm{O}}_{\rm{3}}}\)
  • B
    \({{\rm{H}}_{\rm{3}}}{\rm{P}}{{\rm{O}}_{\rm{4}}}\)
  • C
    \({\rm{P}}{{\rm{H}}_{\rm{3}}}\)
    Correct
  • D
    \({{\rm{P}}_{\rm{2}}}{{\rm{O}}_{\rm{5}}}\)
3
Which one of the following elements symbolised as A and B is a metal \({}_{11}^{23}A{\rm{ }}{}_{20}^{40}B\) ?
  • A
    B is metal
  • B
    Both A and B are metals
    Correct
  • C
    Neither A nor B are metal
  • D
    A is metal
4
Name the metal which is best conductor of electricity-
  • A
    Copper
  • B
    Silver
    Correct
  • C
    Lead
  • D
    Gold
5
Name the reducing agent in the following reaction \(3Mn{O_2} + 4Al \to 3Mn + 2A{l_2}{O_3}\)
  • A
    Al
    Correct
  • B
    \({\rm{Mn}}{{\rm{O}}_{\rm{2}}}\)
  • C
    Mn
  • D
    \({\rm{A}}{{\rm{l}}_{\rm{2}}}{{\rm{O}}_{\rm{3}}}\)
6
The Iron pillar near the Qutub Minar in Delhi is prevented from rusting because of
  • A
    Name of these
  • B
    Formation of \({\rm{F}}{{\rm{e}}_{\rm{2}}}{{\rm{O}}_{\rm{3}}}\) on the surface.
  • C
    formation of \({\rm{F}}{{\rm{e}}_{\rm{3}}}{{\rm{O}}_{\rm{4}}}\) on the surface
    Correct
  • D
    formation of \({\rm{A}}{{\rm{l}}_{\rm{2}}}{{\rm{O}}_{\rm{3}}}\) on the surface
7
The ratio HCl and \({\rm{HN}}{{\rm{O}}_{\rm{3}}}\) in aqua regia is
  • A
    3:1
    Correct
  • B
    3:2
  • C
    2:3
  • D
    1:3
8
The group of metals which do not react with oxygen
  • A
    All of these
  • B
    Na, Cs
  • C
    Au, Ag
    Correct
  • D
    Pt, Cu
9
Which one of the following is not a method for enrichment of are-
  • A
    Roasting and calcinations
    Correct
  • B
    Hydraulic Washing
  • C
    Froth flotation
  • D
    Electromagnetic separation.
10
Roasting is a method of heating are-
  • A
    In the presence of water
  • B
    In the absence of air
  • C
    In the absence of water
  • D
    In the presence of air
    Correct
11
Which of the following is incorrect about \({{\rm{H}}_{\rm{2}}}{\rm{S}}{{\rm{O}}_{\rm{4}}}\)
  • A
    It is insoluble in \({{\rm{H}}_{\rm{2}}}{\rm{O}}\)
  • B
    All of these
    Correct
  • C
    It is non corrosive in nature
  • D
    It is bad conductor of heat and electricity
12
Magnesium imparts
  • A
    White dazzling flame colour
    Correct
  • B
    Yellowish orange flame colour
  • C
    Brick red colour flame
  • D
    None of these
13
Which of the following is not silvery white metal
  • A
    Pb
    Correct
  • B
    Al
  • C
    Sn
  • D
    Ag
14
\({\rm{2 F}}{{\rm{e}}_{\rm{2}}}{{\rm{O}}_{\rm{3}}} + {\rm{ 3C}} \to {\rm{4Fe }} + {\rm{ 3CO}}\) In the above reaction ‘C’ acts as
  • A
    Catalyst
  • B
    dehydrating agent
  • C
    Reducing agent
    Correct
  • D
    oxidising agent
15
The process of extracting a metal from its are is called
  • A
    reduction
  • B
    enrichment
  • C
    refining
  • D
    metallurgy
    Correct