Master QP 7, 2023-24
St. Claret School
Unit test 1 Session : 2023-24 Marks: 20
SECTION A
Choose the correct answer from the options given :
Which of the following is an acid radical ?
a. Mg2+ b. Zn2+ c. Ca2+ d. OH-
Iron has a variable valency of
a. 1,2 b. 3,4 c. 2,3 d.3,1
The latin name of lead is
a. Kalium b. Plumbum c. Stannum d. Natrium
Cuprous ion is
a. divalent b. monovalent c. trivalent d. tetravalent
Electron neither lose nor gain energy while revolving in an orbit. As a result,
a. it doesn't fall into the nucleus b. it takes a spiral path c. it comes closer to the nucleus
d. it is strongly attracted towards the nucleus and fall into it.
There are 15 protons and 16 neutrons in the nucleus of an element. Calculate its atomic number
and mass number
Write balanced chemical equations using symbols and formulae for the following word equations:
Iron + Sulphur ---------> Iron (II) sulphide
Calcium carbonate ------------> Calcium oxide + carbondioxide
Magnesium + Oxygen ----------> Magnesium oxide
Zinc + Sulphuric acied -----------> Zinc sulphate + Hydrogen
Iron + Hydrochloric acid -----------> Iron (II) chloride + hydrogen
Liquid ammonium hydroxide decomposes to give ammonia and water.
a. What are the reactants and products here ?
b. Write the chemical reaction and balance it.
Draw the atomic structures of the following elements and write their electronic configuration:
a. 6C12 b. 8O16 c. 11Na23
Define radicals
Question 1
Fill in the blanks:
a. Molecules are made up of ----------
b. The quantity of matter in an object is called its --------
c. The solid substance formed after cooling of vapours is called ---------
d. The substances which can flow are called --------
Question 2
Name the terms for the following :
a. The change of vapour into a liquid
b. Gaps between the molecules of matter
c. The space occupied by a body.
Question 3
Write a chemical change which takes place in presence of :
a. Heat
b. Light
c. Electricity
SECTION B
Question 4
a. State three differences between evaporation and boiling.
b. Is burning a physical change or a chemical change ? Why ?
c. If an object weighs 12N on earth what will be its weight on moon ? What will be the change in its mass.
Question 5
What do you observe when :
a. A lighted match stick is brought near the mouth of the test tube containing hydrogen gas
b. Quick lime is dissolved in water.
c. An empty jar is inverted over a jar containing bromine vapours
Neatness and handwriting
[5]
d, lang chm
c, lang chm
b, lang chm
b, atm str
a, atm str
[2] atm str, at no: 15, mass no: 31
[10] lang chm
[3] lang chm
R; ammonium hydroxide p: water, ammonia
NH4OH ----> NH3 + H2O
[6] Atm str
[1] Atm str
[4]
L1,t11, atoms
L1,t11, mass
L2,t18, sublimate
L1, t8,t11, fluids
[3]
L1, t11, condensation
L1,t11, intermolecular space
L1,t2, volume
[3] L2,25
burning
photosynthesis
c. Electrolysis
[3] L2,t20
[2] L2,t21, subst turns into ash, irreversible chem change
[2] L1,12x1/6---->2, no change in mass, remains same
[3]
L2, t25, gas burns with a pop sound
L2, t25, water becomes hot
L1,t8, coloured gas ( reddish brown) spreads in upper jar
[3]
