Class 10 Metals And Non-metals CBSE Questions & Answers

Class 10 · Metals And Non-metals

This is online test 03 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
Cryolite is used in the electrolytic reduction of Alumina \(\left( {{\rm{A}}{{\rm{l}}_{\rm{2}}}{{\rm{O}}_{\rm{3}}}} \right)\) to
  • A
    All of these
  • B
    decrease the m.p of \({\rm{A}}{{\rm{l}}_{\rm{2}}}{{\rm{O}}_{\rm{3}}}\)
    Correct
  • C
    to slow down the reaction
  • D
    act as a flux to separate gangue
2
Which of the following metal reacts neither with cold water nor with hot water but reacts heated steam to produce hydrogen gas?
  • A
    Fe
    Correct
  • B
    Mg
  • C
    Na
  • D
    Ca
3
Fountain experiment demonstrates
  • A
    Manufacturing of \({\rm{N}}{{\rm{H}}_{\rm{3}}}\)
  • B
    None of these
  • C
    Solubility of \({\rm{N}}{{\rm{H}}_{\rm{3}}}\) in \({{\rm{H}}_{\rm{2}}}{\rm{O}}\)
    Correct
  • D
    Solubility of \({\rm{S}}{{\rm{O}}_{\rm{2}}}\) in water
4
Statement A: All metals form basic oxides, Statement B: few non metal form neutral oxides
  • A
    Statement A is true, B is false
  • B
    Both the statements A and B are true
  • C
    Both the statements A and B are false
  • D
    Statement B is true, A is false
    Correct
5
An element belonging to 16th group of periodic table is used in the manufacturing of vulcanized rubber. This element reacts with hot and cone \({\rm{HN}}{{\rm{O}}_{\rm{3}}}\) to form sulphuric acid. The concerned element is
  • A
    Si
  • B
    S
    Correct
  • C
    O
  • D
    Ge
6
Statement A : The electrical conductivity and m.p of an alloy is less than that of pure metals. Statement B : different metals have same reactivity with water and dilute acids.
  • A
    Statement A is true, B is false
    Correct
  • B
    Both the statement A and B are true
  • C
    Neither the statement A nor Statement B is true
  • D
    Statement B is true, A is false
7
Sulphide ores are concentrated by-
  • A
    Chemical separation
  • B
    Froth flotation
    Correct
  • C
    Hydraulic washing
  • D
    Magnetic separation
8
In the electrolytic refining of copper, the impure metal is made the
  • A
    none of these
  • B
    Cathode
  • C
    Can be ‘Anode’ or ‘Cathode’
  • D
    Anode
    Correct
9
What happens when \(N{H_3} + HCl \to ?\)
  • A
    \({\rm{C}}{{\rm{l}}_{\rm{2}}}\) gas is evolved
  • B
    \({{\rm{H}}_{\rm{2}}}\) gas is evolved
  • C
    Both \({{\rm{H}}_{\rm{2}}}\) and \({\rm{N}}{{\rm{H}}_{\rm{4}}}{\rm{Cl}}\)
  • D
    \({\rm{N}}{{\rm{H}}_{\rm{4}}}{\rm{Cl}}\) is formed
    Correct
10
\({\rm{HN}}{{\rm{O}}_{\rm{3}}}\) is a strong acid because
  • A
    It dissociates partially in aqueous soln.
  • B
    It doesn’t dissociates into ions at all
  • C
    It dissociates completely in aqueous soln.
    Correct
  • D
    None of these
11
Food cans are coated with tin and not with zinc because
  • A
    Zinc is more reactive than tin
    Correct
  • B
    Zinc is costlier than tin
  • C
    Zinc is less reactive than tin
  • D
    Zinc has a higher m. p than tin
12
Which one is not used for reduction-
  • A
    Electrolysis
  • B
    Coke
  • C
    Aluminium
  • D
    None of these
    Correct
13
Monoclinic is the
  • A
    ore of sulphur
  • B
    Isobar of sulphur
  • C
    allotrope of sulphur
    Correct
  • D
    Isotope of sulphur
14
Non metals do not replace hydrogen from acids because
  • A
    None of these
  • B
    non metal being acceptor of electrons don’t provide free electrons and hence do not replace hydrogen from acids
    Correct
  • C
    they are more reactive than hydrogen
  • D
    they are less reactive than hydrogen
15
statement A : Many compounds containing sulphur are used as medicines. Statement B : cast iron contains 3-5% of carbon
  • A
    statement A is true, B is false
  • B
    statement A is false, B is true
  • C
    Both the statement A and B are true
    Correct
  • D
    Both the statements A and B are false.