ATOMIC STRUCTURE CHEMISTRY (FOUNDATION)
Dear student following is an Easy level [ ] test paper. Score of 21 Marks in 10 Minutes would be a satisfactory performance. Questions 1- 9 (+3, –1). (Only one option is correct)
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CHEMISTRY FOUNDATION (CLASS TEST 1/6) (ATOMIC STRUCTURE) ANSWER KEY
Name : .......................................................................................... Roll No. : .................................. A B C D 1 2 3 A B C D 4 5 6
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A B C D
7 8 9
Q.1 When alpha particles are sent through a thin metal foil, most of them go straight through the foil because : (A) Alpha particles are much heavier than electron (B) Alpha particles are positively charged (C) Alpha particles move with high velocity (D) Most part of the atom is empty
Q.2 Which is correct statement about proton ? (A) Proton is nucleus of deuterium (B) Proton is α - particle (C) Proton is ionized hydrogen molecule (D) Proton is ionized hydrogen
Q.3 The electron was shown experimentally to have wave properties by : (A) De broglie (B) Davisson and Germer (C) N. Bohr (D) Schrodinger
Q.4 The heaviest particle is : (A) Meson (B) Neutron (C) Electron (D) Proton
Q.5 The redius of atomic nucleus is of the order of (A) 10–12 m (B) 10–8 m (C) 10–15 m (D) 10–10 m
Q.6 Which of the following are isoelectronic with one anothre ? (A) Na+ and Ne (B) K+ and O (C) Ne and O (D) Na+ and K+
Q.7 The aromic weight of an element is 23 and atomic number is 11. The number of protons, electrons and neutrons respectively present in the atom of the element are : (A) 11, 11, 12 (B) 12, 12, 11 (C) 11, 12, 11 (D) 12, 11, 12
Q.8 Which of the following atoms has the largest atomic radius ? (A) 3Li (B) 5B (C) 7N (D) 8F
Q.9 An isotone of 77 33Ge is
(A) 77 32Ge (B) 77 33As (C) 77 34Se (D) 76 34Se
CLASS TEST 1/6 ATOMIC STRUCTURE CHEMISTRY (FOUNDATION)
EDUCATIONS , 608-A, TALWANDI KOTA (RAJ.) Ph. 0744 - 6450883, 2405510 PAGE # 2
EDUCATIONS
ANSWER KEY
SOLUTIONS
Sol.1 (D) α-particles pass through because most part of the aotm is empty.
Sol.2 (D) Proton is ionized hydrogen.
Sol.3 (B) Davisson and Gemer.
Sol.4 (B) Mass of Neutron of slightly greater than proton.
Sol.5 (C) Radius of atomic nucleus = 10–15 m.
Sol.6 (A) No. of electrons in Na+ = No. of electrons in Ne = 10.
Sol.7 (A) Q Atomic number = 11 ∴ No. of protons (p) = No. of electrons (e–) = 11 Q Atomic weight = 23 ∴ No. of neutrons = 23 – 11 = 12.
Sol.8 (A) Atomic size decrease along the period.
Sol.9 (B) isotones have same number of neutrons (= mass number – atomic number)
Dear student following is an Easy level [ ] test paper. Score of 21 Marks in 10 Minutes would be a satisfactory performance. Questions 1- 9 (+3, –1). (Only one option is correct)
&
CHEMISTRY FOUNDATION (CLASS TEST 1/6) (ATOMIC STRUCTURE) ANSWER KEY
Name : .......................................................................................... Roll No. : .................................. A B C D 1 2 3 A B C D 4 5 6
&
A B C D
7 8 9
Q.1 When alpha particles are sent through a thin metal foil, most of them go straight through the foil because : (A) Alpha particles are much heavier than electron (B) Alpha particles are positively charged (C) Alpha particles move with high velocity (D) Most part of the atom is empty
Q.2 Which is correct statement about proton ? (A) Proton is nucleus of deuterium (B) Proton is α - particle (C) Proton is ionized hydrogen molecule (D) Proton is ionized hydrogen
Q.3 The electron was shown experimentally to have wave properties by : (A) De broglie (B) Davisson and Germer (C) N. Bohr (D) Schrodinger
Q.4 The heaviest particle is : (A) Meson (B) Neutron (C) Electron (D) Proton
Q.5 The redius of atomic nucleus is of the order of (A) 10–12 m (B) 10–8 m (C) 10–15 m (D) 10–10 m
Q.6 Which of the following are isoelectronic with one anothre ? (A) Na+ and Ne (B) K+ and O (C) Ne and O (D) Na+ and K+
Q.7 The aromic weight of an element is 23 and atomic number is 11. The number of protons, electrons and neutrons respectively present in the atom of the element are : (A) 11, 11, 12 (B) 12, 12, 11 (C) 11, 12, 11 (D) 12, 11, 12
Q.8 Which of the following atoms has the largest atomic radius ? (A) 3Li (B) 5B (C) 7N (D) 8F
Q.9 An isotone of 77 33Ge is
(A) 77 32Ge (B) 77 33As (C) 77 34Se (D) 76 34Se
CLASS TEST 1/6 ATOMIC STRUCTURE CHEMISTRY (FOUNDATION)
EDUCATIONS , 608-A, TALWANDI KOTA (RAJ.) Ph. 0744 - 6450883, 2405510 PAGE # 2
EDUCATIONS
ANSWER KEY
SOLUTIONS
Sol.1 (D) α-particles pass through because most part of the aotm is empty.
Sol.2 (D) Proton is ionized hydrogen.
Sol.3 (B) Davisson and Gemer.
Sol.4 (B) Mass of Neutron of slightly greater than proton.
Sol.5 (C) Radius of atomic nucleus = 10–15 m.
Sol.6 (A) No. of electrons in Na+ = No. of electrons in Ne = 10.
Sol.7 (A) Q Atomic number = 11 ∴ No. of protons (p) = No. of electrons (e–) = 11 Q Atomic weight = 23 ∴ No. of neutrons = 23 – 11 = 12.
Sol.8 (A) Atomic size decrease along the period.
Sol.9 (B) isotones have same number of neutrons (= mass number – atomic number)
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