XI – Chemistry
Chapter - 1
Assertion and Reason Type
In
the following questions a statement of Assertion (A) followed by a statement of
Reason (R) is given. Choose the correct option out of the choices given below
each question.
1. Assertion
(A): The empirical mass of ethene is half of its molecular mass.
Reason
(R):
The empirical formula represents the simplest whole number ratio of various
atoms present in a compound.
(i)
Both A and R are true and R is the correct
explanation of A.
(ii)
A is true but R is false.
(iii)
A is false but R is true.
(iv)
Both A and R are false.
2.
Assertion (A): One atomic mass unit is defined as one
twelfth of the mass of one carbon-12 atom.
Reason
(R):
Carbon-12 isotope is the most abundant isotope of carbon and has been chosen as
standard.
(i)
Both A and R are true and R is the correct
explanation of A.
(ii)
Both A and R are true but R is not the
correct explanation of A.
(iii)
A is true but R is false.
(iv)
Both A and R are false.
3.
Assertion (A): Significant figures for 0.200 is 3
whereas for 200 it is 1.
Reason (R): Zero at the end or right of
a number are significant provided they are not on the right side of the decimal
point.
(i)
Both A and R are true and R is correct
explanation of A.
(ii)
Both A and R are true but R is not a
correct explanation of A
(iii)
A is true but R is false.
(iv)
Both A and R are false.
4.
Assertion (A): Combustion of 16 g of methane gives 18 g
of water.
Reason
(R):
In the combustion of methane, water is one of the products.
(i)
Both A and R are true but R is not the
correct explanation of A.
(ii)
A is true but R is false.
(iii)
A is false but R is true.
(iv)
Both A and R are false
Matching
type
5.
Match the following physical quantities with units
Physical quantity Unit
(i)
Molarity (a)
g mL–1
(ii)
Mole fraction (b) mol
(iii)
Mole (c)
Pascal
(iv)
Molality (d)
Unitless
(v)
Pressure (e)
mol L–1
(vi)
Luminous intensity (f) Candela
(vii)
Density (g)
mol kg–1
(viii)
Mass (h)
Nm–1
(i)kg
6.
In a compound C, H and N are present in 9:1:3.5 by weight. If molecular weight
of the compound is 108, then the molecular formula of the compound is:
(a)
C2H6N2 (b)
C3H4N (c)
C6H8N2 (d)
C9H12N3
7. Gastric juice
contains 3.0 g of HCl per litre. If a person produces 2.5 litre of gastric
juice per day. How many antacid tablets each containing 400 mg of Al(OH)3
are needed to neutralize all the HCI produced in one day?
(a)
18 (b) 14 (c) 20 (d) 17
8.
Assuming fully decomposed, the volume of CO2 released at STP on
heating 9.85 g of BaCO3 (Atomic mass, Ba = 137) will be:
(a)
1.12L (b)
2.24L (c) 4.06L (d) 0.84L
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