Atoms And Molecules Questions

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Atoms And Molecules Questions

List of atoms and molecules Questions

Question NoQuestionsClass
111. Which of the following is a symbol of palladium
(a) B
(b) Pd
(c) Be
(d) AR
9
24.
Which of the following are acidic radicals?
(a) POZ
(b) Mg2+
(c) Co
(d) NO;
9
3Onus
UUU ULIO
4.
The atomicity of an element tells about its
(a) chemical properties
(b) physical properties
(c) number of atoms of element present in a molecule
(d) none of these
Which of the fo11 wingi neithor an element nor a
9
4Assertion : The molecular mass of NaOH is 40.
Reason: The molecular mass of a compound is defined as
the sum of the atomic weights of all the constituent atom
present in a molecule.
9
5In which of the following compounds phosphorus (P) has
valency 3?
(a) PCI
(b) PC12
(c) PCI
(d) None of these
9
6Q6. Write formulas for the following compounds:
(a) Mercury (II) chloride, (b) Nickel (II) sulphate, (c) Tin (IV) oxide, (d) Thallium
(1) sulphate, (e) Iron (III) sulphate, Chromium (III) oxide.
TY
STOCHT
9
7Allalyutal Uitmuy
9.
What is the valency of sulphur in sulphur dioxide (SO )?
(a) 3
(b) 2
(c) 6
(d) 4
9
83.
How many times greater is the valency of N in NH2 than
that of Cl in HCI?
(a) 3
(b) 2
(d) 5
(C)
4
9
91.
Which of the following is / are bivalent radicals2
(a) Sulphate
(b) Bisulphate
(c) Sulphite
(d) Sulphide
ta
9
1012. Hg is a symbol of
(0) Lead
(c) Antimony
(b) Tìm
(d) Mercury
9
11What is the valency of the underlined elements in following
compounds respectively.
AgI, Mg2N,, NaCl, CaCl2
(a) 1,2,2,2
(b) 1,2,1,1
(c) 1,2,1,2
(d) 2,1,1,2
9
12Which of the following ion is divalent?
(a) SO
(b) POZ
(c) Cu2+
(d) Sn2+
9
133. Calculate the sum of the valencies of Helium, Phosphorus
Calculate the sum of the valencies of Helium, Phosphorus
and neon.
9
14An atom X has a mass that is four times that of carbon
atom. What mass of X will combine with 1.00 g of
carbon in forming the compound X,C?
(a) 1.00 g
(b) 2.00 g
(c) 4.00 g
(d) 8.00 g
9
1544. ‘Atomic theory of matter was
given by
(1) Avogadro (2) Dalton
(3) Newton (4) Pascal
9
16:
h
14. The noble gases or rare gases exist as
(a) Mono-atomic
(b) Di-atomic
(c) Tri – atomic C (d) Tetra – atomic
7.
9
1718. Chemical formula of Aluminium sulphate is
(a) AL,(SO4)3
(b) AISO
(©) Al2(SO4)2
(d) None of the above
9
186.
The formula of sodium pyrophosphate is
(a) Na, P. O.
(b) Na PO
(e) Na,P20
(d) Na PO,
9
192.
Which one of the following information is conveyed by the
symbol of an element?
(a) The name of the element
(b) The atomic mass of the element
(c) The atomic number of the element
(d) All the above
9
20Which one is a bivalent ion?
(a) sodium
(b) calcium
(c) sulphide
(d) both (b) and (c)
9
2116. Which one of the given respons-
es would be a meaningful order
of the following in ascending or-
der?
1. atom
2. matter
3. molecule 4. electron
(1)41 32 (2)3 1 42
(3)3 4 12 (4) 1 2 3 4
9
223.
Select the polyatomic elements.
(a) 02
(b) 0,
(c) PA
(d) Sg
9
231.
Atomicity of Phosphorous
9
242.
What is the valency of Carbon in CH,
9
251.
Column I
A. SO,
B. Fe2+
C N3
D. PO3-
Column II
(p) Bivalent
(9) Monoatomic
(r) Trivalent
(s) Polyatomic
9
26***
CVI CVECE vul Reason 15 CUT.
1.
Assertion : The combining capacity of an atom or radical is
known as its valency.
Reason: The valency of an element is always a whole
number
9
2710. Molecular weight of water is
(a) 16 amu
(c) 10 amu
(b) 12 amu
(d) 18 arnu
9
28Chemical formula gives information about
(a) which elements are present in compound
(b) physical properties of compound
(c) nature of compound
(d) total number of atoms of each element present in
compounds
9

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