Basic Concepts Of Chemistry Test

Basic Concepts Of Chemistry

This is Basic concepts of chemistry Test-03 for CBSE class 12 Chemistry.. There are 15 questions in this test with each question having around four answer choices.

Questions & Answers

1
----- KOH + ----- $H_3PO_4$ → ----- $K_3PO_4$ + ----- $H_2O$. This equation can be balanced by inserting the following in blank spaces
  • A
    3,2,1,2
  • B
    3,1,1,3
    Correct
  • C
    6.1.2.3
  • D
    3,1,2,3
2
-----CO (g) + ----- $H_2$(g) → ----- $C_8$$H_18$(l) + ----- $H_2O$. This equation can be balanced by inserting the following in blank spaces
  • A
    8,17,1,8
    Correct
  • B
    8,8,1,17
  • C
    8,2,8,17
  • D
    8,2,1,17
3
----- Al + ------ $O_2$ → ------ $Al_2O_3$ . This equation can be balanced by inserting the following in blank spaces
  • A
    4,2,3
  • B
    2,3,1
  • C
    4,3,2
    Correct
  • D
    2,3,3
4
------ $Ba_3N_2$ +----- $H_2O$ → ------ Ba $(OH)_2$ + ------ $NH_3$ . This equation can be balanced by inserting the following in blank spaces
  • A
    1,6,3,2
    Correct
  • B
    1,3,6,2
  • C
    2,6,1,2
  • D
    1,6,3,6
5
The molar mass of $CO_2$ is
  • A
    46 g
  • B
    44 g
    Correct
  • C
    78 g
  • D
    30 g
6
The molar mass of $Al_2O_3$ is
  • A
    92
  • B
    82
  • C
    102
    Correct
  • D
    112
7
The molar mass of $C_6H_10O_5$ is
  • A
    172
  • B
    182
  • C
    162 g
    Correct
  • D
    152
8
The molar mass of $CaCO_3$ is
  • A
    90
  • B
    120
  • C
    70
  • D
    100 g
    Correct
9
The molar mass of $AgNO_3$ is
  • A
    189.9
  • B
    179.9
  • C
    169.9 g
    Correct
  • D
    159.9
10
How many atoms of Oxygen are there in 18g of water? (Hint: Avagadro’s Number = 6.02 x $10^{23}$ atoms/mol)
  • A
    6.02 x $10^23$
    Correct
  • B
    5.02 x $10^23$
  • C
    7.02 x $10^23$
  • D
    8.02 x $10^23$
11
Given that Avagadro’s Number = 6.02 x $10^23$ atoms/mol , the number of hydrogen atoms in 18g of water is.
  • A
    2. 204 x $10^24$
  • B
    0. 204 x $10^24$
  • C
    3. 204 x $10^24$
  • D
    1. 204 x $10^24$
    Correct
12
There are ___ in 2000 mm?
  • A
    2 m
    Correct
  • B
    200 m
  • C
    0.02 m
  • D
    0.002 m
13
There are ____ in 0.05 ml?
  • A
    0.00005 liters
    Correct
  • B
    0.0005 liters
  • C
    5 liters
  • D
    50 liters
14
The molarity of NaOH in the solution prepared by dissolving its 4 g in enough water to form 250 mL of the solution:
  • A
    0.04M
  • B
    0.4 M
    Correct
  • C
    2M
  • D
    4M
15
Whenever there is a rearrangement of atoms that makes or breaks chemical bonds. Choose the most appropriate
  • A
    catalysts are produced.
  • B
    products appear,
  • C
    reactants disappear
  • D
    a chemical reaction takes place
    Correct