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1
Which of the following is a divalent element ?
Hydrogen
Oxygen
Boron
Carbon
2
What is the full form of "u" according to IUPAC?
Unit
Unit per mole
Unified mass.
Union
3
Avogadro number is __________________.
6.022 X 1023
6022 X 1023
602.2 X 1023
60 X 1023
4
To find the gram molecular mass or molar mass we keep the numerical value same but change the units from ‘u’ to _________.
amu
Da
G
g
5
Which of the following metal can sometimes be found in free state ?
Fe
Na
Au
Zn
6
What is the full form of CuO.
Calcium oxide
Copper oxide
Carbon monoxide
Cuprous oxide
7
Which law states that mass can neither be created nor be destroyed during a chemical reaction ?
Law of conservation of mass
Law of definite proportion
Both (a) and (b) are correct
Both (a0 and (b) are incorrect.
8
The equation
Is in accordance with the law of _______________
Gaseous diffusion
Resiprocal proportion
Conservation of mass
Dalton's atomic theory
9
The Gay's Lussac's law of Gaseous Volume is an example of the Law of _______________________.
Physical Combination
Chemical Combination
Separation
All of these
10
Which of the following are formed by the two different atoms?
(a) Water
(b) Gold
(c) Salt
(d) Iron
Only (a) and (b) are correct.
Only (a) and (c) are correct.
Only (b) and (c) are correct.
Only (b) and (d) are correct.
11
Which of the following law is also known as law of indestructibility of matter ?
Law of constant proportion
None of these
12
What is the weight of oxygen that is required for the complete combustion of 0.7 kg of ethylene?
2.8 kg
6.4 kg
24.0 kg
2.4 kg
13
gas was prepared by
(1) burning sulphur in oxygen,
(2) reaching sodium sulphite with dilute and
(3) heating copper with conc.
And it was found that in each case sulphur and oxygen combined in the ratio of 1:1. The data illustrates the law of:
Multiple proportions
Constant proportions
Reciprocal proportions
14
Which of the following statement / statements are correct :
(a) Molecular formula of the ammonia is NH3.
(b) In gram molecular mass, g is gravity.
(c) Multiply the subscript after each element symbol(the no. of atoms) by the element's atomic mass of an element.
Only (b) and (c) are correct
None of these.
15
Which of the following statement/statements are correct :
(a) The positively charged ions are known as cations.
(b) The positively charged ions are known as anions.
(c) The negatively charged ions are known as cations.
(d) The negatively charged ions are known as anions.
Only (a) and (d) are correct.