Species present in a substance refers to

  • atoms
  • ions
  • molecules
  • representative particles

The smallest part of an element that cannot exist as a free state is

  • ion
  • charge
  • atom
  • molecule

A free radical has

  • unpaired electrons
  • paired electrons
  • no electrons
  • even number of electrons

Cookies and bread rise due to

  • conversion of washing soda into CO2
  • conversion of H2O in to CO2
  • conversion of baking soda into O2
  • conversion of baking soda in to CO2

When halogens are exposed to sunlight, they split up in to

  • atoms
  • ions
  • radicals
  • molecules

A hydrogen atom is

  • 8.40% as massive as C-12
  • 10% as massive as C-12
  • 20% as massive as C-12
  • 30% as massive as C-12

A balloon filled with 5g of hydrogen contains

  • 2.48 moles of H2
  • 3.48 moles of H2
  • 4.48 moles of H2
  • 5 moles of H2

The number of protons and neutrons in the nucleus if the atomic number of an element is 17 and the mass number is 35, is

  • 17 and 18
  • 17 and 19
  • 17 and 20
  • 17 and 21

Over 70% of earth's crust is covered with

  • water
  • land
  • coal
  • trees

The list which contains only elements is

  • air, water, oxygen
  • Hydrogen, oxygen, brass
  • Air, water, fire, earth
  • Calcium, Sulphur, carbon

The formula mass indicates the simplest ration between

  • cations only
  • anions only
  • atoms
  • cation and anions

Branch of chemistry dealing with the plantation and overcoming greenhouse effect is

  • Biochemistry
  • Organic chemistry
  • Environmental chemistry
  • Inorganic chemistry

1 mole of a substance refers to

  • molar mass
  • atomic mass
  • electron mass
  • neutron mass

The number of protons in the nucleus constitute it's

  • atomic mass
  • atomic number
  • nucleon number
  • number of neutrons

If 9.05 moles of ozone is formed in a storm then the mass of ozone is

  • 435g
  • 450g
  • 434.4g
  • 480g

Ca on losing 2 electrons becomes

  • Ca-2
  • Ca-1
  • Ca+2
  • Ca-2

Biochemistry deals with

  • physical changes in living organisms only
  • chemical changes in living organisms only
  • genetically changes in living organisms
  • physical and chemical changes in living organisms

The mass number of an atom is

  • number of protons only
  • number of neutrons only
  • number of electrons
  • number of protons and neutrons

A mole of any substance contains

  • 6.022 * 1022 particles
  • 6.022 * 1023 particles
  • 6.022 * 1024 particles
  • 6.022 * 1025 particles

The number of atoms in 5 moles of nitrogen atom is

  • 3.01 * 1024
  • 4.1 * 1030
  • 3.9 * 1032
  • 5 * 1056
0 h : 0 m : 1 s

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