A mole of any substance contains
1. 6022 * 1022 particles
2.6022 * 1023 particles
3. 6022 * 1024 particles
4. 6022 * 1025 particles
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Compounds have atoms of
1.same sizes
2.different sizes
3.same electrons
4.different electrons
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When halogens are exposed to sunlight they split up in to
1. atoms
2. ions
3. radicals
4. molecules
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1 mole of a substance refers to
1. molar mass
2.atomic mass
3.electron mass
4.neutron mass
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6022 * 1023 atoms of Sulphur contains
1.2 moles
2.3 moles
3.4 moles
4.1 mole
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A balloon filled with 5g of hydrogen contains
1. 248 moles of H2
2. 348 moles of H2
3. 448 moles of H2
4. 5 moles of H2
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A free radical has
1. odd number of electrons
2. even number of electrons
3. no electrons
4.none of above
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A free radical has
1. unpaired electrons
2. paired electrons
3. no electrons
4. even number of electrons
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A hydrogen atom is
1. 840% as massive as C-12
2. 10% as massive as C-12
3. 20% as massive as C-12
4. 30% as massive as C-12
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A science that examines the material this universe contains and changes in them is called
1.Chemistry
2.Physics
3.Biology
4.Geography
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A substance whose all atoms have the same atomic number is
1. molecule
2.atom
3. element
4. ion
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An ionic compound is electrically
1.neutral
2.positively charged
3.negatively charged
4.none of above
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An oxide ion has -2 charge because
1.oxygen looses two electrons
2.oxygen gains two electrons
3.oxygen becomes neutral
4.oxygen gains 3 electrons
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Branch of chemistry dealing with the plantation and overcoming greenhouse effect is
1. Biochemistry
2. Organic chemistry
3. Environmental chemistry
4.Inorganic chemistry
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Cookies and bread rise due to
1. conversion of washing soda into CO2
2. conversion of H2O in to CO2
3. conversion of baking soda into O2
4. conversion of baking soda in to CO2
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Gram molecular mass of C6H12O6 is
1.18016g
2.180096g
3.585g
4.70g
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If one mole of carbon contains x atoms then the number of atoms in 12g of Mg are
1.x
2.05x
3.2x
4.15x
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In glucose the simplest ratio between C H and O is
1.840625
2.126400463
3.4306713
4.127789352
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Negatively charged ions are called
1.cations
2.anions
3.ion
4.none of above
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Over 70% of earths crust is covered with
1. water
2. land
3. coal
4.trees
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Species present in a substance refers to
1.atoms
2.ions
3.molecules
4.representative particles
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The branch of chemistry which deals with a substance containing carbon is called
1.carbon chemistry
2.inorganic chemistry
3.organic chemistry
4.environmental chemistry
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The formula mass indicates the simplest ration between
1. cations only
2.anions only
3. atoms
4. cation and anions
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The formula mass of NaCl is
1.575 amu
2.585 amu
3.595 amu
4.600 amu
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The formula which gives the simplest whole-number ratio of atoms is
1.empirical formula
2.molecular formula
3.chemical formula
4.actual formula
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The gram atomic mass of Zn is
1. 23g
2. 12g
3. 6354g
4. 5667g
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The list which contains only elements is
1. air water oxygen
2. Hydrogen oxygen brass
3. Air water fire earth
4. Calcium Sulphur carbon
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The mass number of an atom is
1. number of protons only
2. number of neutrons only
3. number of electrons
4. number of protons and neutrons
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The mass of 1 mole of sucrose is
1.320g
2.342g
3.341g
4.340g
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The mass of an atom relative to C-12 is
1. atomic mass
2. atomic number
3. nucleon number
4. relative atomic mass
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The mass of carbon present in 44g of carbon dioxide is
1.12g
2.6g
3. 44g
4.24g
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The matter is anything that occupies
1.space only
2.mass only
3.time
4.space and mass
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The molecular formula gives
1.simplest ratio of atoms
2.actual whole number ratio of atoms
3.whole number ratio of atoms
4.natural number ratio of atoms
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The molecular mass of glucose is
1.180096 amu
2.190096 amu
3.181096 amu
4.130096 amu
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The number of atoms in 5 moles of nitrogen atom is
1.301 * 1024
2.41 * 1030
3.39 * 1032
4.5 * 1056
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The number of atoms of hydrogen in 2 moles of NH3
1.5 * 1023
2.301 * 1023
3.361 * 1024
4.4 * 1023
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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
1. 17 and 18
2. 17 and 19
3.17 and 20
4. 17 and 21
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The number of protons in the nucleus constitute its
1. atomic mass
2. atomic number
3. nucleon number
4. number of neutrons
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The relative atomic mass of Na is
1. 1008 amu
2. 229898 amu
3. 269815 amu
4. 159994 amu
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The smallest part of an element that cannot exist as a free state is
1. ion
2. charge
3.atom
4.molecule
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The substance which has a formula mass of 1335 amu is
1.MgCl2
2.S2Cl2
3.BCl3
4.AlCl3
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Which of the following is present in vinegar?
1.10% acetic acid
2.5%acetic acid
3.7% acetic acid
4.8% acetic acid
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