Which of the following is correctly matched ?
(a) Aluminium—Haematite
(b) Lead—Galena
(c) Iron—Bauxite
(d) Magnesium—Malachite
Answer: b
P-particles are
(a) Orbital electrons
(b) Electrons present in atmosphere
(c) Electrons emitted by nucleus
(d) Electrons obtained during cation formation
Answer: c
Positrons are particles
(a) Having a unit positive charge
(b) Having same mass as electrons
(c) Given out by artificial radioactive substances
(d) Have all the above characteristics
Answer: d
Mass number of an Uranium isotope which is used in atom bomb is
(a) 231
(b) 233
(c) 235
(d) 236
Answer: c
In which of the following compounds the oxidation number of oxygen is +2 ?
(a) F2O
(b) O3
(c) KO3
(d) Na2O2
Answer: a
Which is the strongest acid ?
(a) H2SO4
(b) HC1
(c) HNO3
(d) H2CO3
Answer: a
Which of the following is a non-metal ?
(a) Gallium
(b) Indium
(c) Boron
(d) Aluminium
Answer: c
Which of the following is a polymer?
(a) Vinyl chloride
(b) Urea
(c) Starch
(d) Styrene
Answer: c
Which of the following statements about the physical properties of non- metals is not correct ?
(a) They are not ductile
(b) Most of these have high melting and boiling points
(c) They do not conduct electricity
(d) They are not malleable
Answer: b
The differences in the physical properties of metals and non-metals are due to
(a) Different structures of their atoms
(b) Different number of their atoms
(c) The fact that metals have atoms whereas non-metals have none
(d) None of these
Answer: a
(a) Aluminium—Haematite
(b) Lead—Galena
(c) Iron—Bauxite
(d) Magnesium—Malachite
Answer: b
P-particles are
(a) Orbital electrons
(b) Electrons present in atmosphere
(c) Electrons emitted by nucleus
(d) Electrons obtained during cation formation
Answer: c
Positrons are particles
(a) Having a unit positive charge
(b) Having same mass as electrons
(c) Given out by artificial radioactive substances
(d) Have all the above characteristics
Answer: d
Mass number of an Uranium isotope which is used in atom bomb is
(a) 231
(b) 233
(c) 235
(d) 236
Answer: c
In which of the following compounds the oxidation number of oxygen is +2 ?
(a) F2O
(b) O3
(c) KO3
(d) Na2O2
Answer: a
Which is the strongest acid ?
(a) H2SO4
(b) HC1
(c) HNO3
(d) H2CO3
Answer: a
Which of the following is a non-metal ?
(a) Gallium
(b) Indium
(c) Boron
(d) Aluminium
Answer: c
Which of the following is a polymer?
(a) Vinyl chloride
(b) Urea
(c) Starch
(d) Styrene
Answer: c
Which of the following statements about the physical properties of non- metals is not correct ?
(a) They are not ductile
(b) Most of these have high melting and boiling points
(c) They do not conduct electricity
(d) They are not malleable
Answer: b
The differences in the physical properties of metals and non-metals are due to
(a) Different structures of their atoms
(b) Different number of their atoms
(c) The fact that metals have atoms whereas non-metals have none
(d) None of these
Answer: a