Chemistry Quiz (Focus--Chemical Reactions ,Acids and Bases)

Q 1:A reaction in which a single product is formed from two or more reactants is known as a ....................
Metastasis Reaction
Combinational Reaction
Redox Reaction

Q 2:Reaction in which heat is released along with the formation of products is called ...................Reaction

Endothermic
Exothermic
Redox

Q 3:If a lighted paper is introduced in a jar of carbon dioxide?
It turns into liquid
It will burn more brightly
It will extinguish

Q 4:A single reactant breaks down to give simpler products. This is a...........reaction
Combinational
Decomposition
Substitution

Q 5:White silver chloride turns grey in sunlight.Which is this type of reaction?
Exothermic
Endothermic
Metastasis

Q 6:.............. bond is formed by Transferring of Electrons between 2 Atoms.
Dative
Covalent
Ionic

Q 7:...................bond is also called as Semi - Polar bond since; it involves Electrovalency and Covalency both.
Covalent
Co-ordinate
Ionic

Q 8:If a substance gains oxygen during a reaction, it is said to be oxidized. If a substance loses oxygen during a reaction, it is said to be reduced. In other words, one reactant gets oxidized while the other gets reduced during a reaction. Such reactions are ..............reactions?
Combinational
Redox
Decomposition

Q 9: The black coating on silver and the green coating on copper are other examples of ...............?
Antioxidation
Rancidity
Corrosion

Q 10:Litmus solution is a purple dye, which is extracted from .........., a plant belonging to the division Thallophyta, and is commonly used as an indicator.
amoeba
lichen
paramaceia

Q 11:There are some substances whose odour changes in acidic or basic media. These are called ..................indicators
olfactory
Myers-Briggs Type
pH

Q 12:Calcium hydroxide, which is a base, reacts with carbon dioxide to produce a salt and water. Since this is similar to the reaction between a base and an acid, we can conclude that non-metallic oxides are ............... in nature.

basic
acidic
neutral

Q 13:The process of dissolving an acid or a base in water is a highly ............. one.
combustive
endothermic
exothermic

Q 14:A scale for measuring hydrogen ion concentration in a solution, called .....scale
pH scale
Fitzpatrick scale
Hungarian minor scale

Q 15:The p in pH stands for ‘potenz’ in German, meaning ..............
parity
power
priority

Q 16:When pH of rain water is less than 5.6, it is called ........rain
Basic
Murasame
Acid

Q 17:Tooth decay starts when the pH of the mouth is lower than ...........
5.5
4.2
6.8

Q 18:Vinegar is also called as?
citric acid
acetic acid
lactic acid

Q 19:Click the wrong combination.
Tamarind--Tartaric acid
Lemon--Citric acid
Nettle sting--Oxalic acid

Q 20:Salts of a strong acid and a strong base are neutral with pH value of ?
7
9
5

Q 21:When electricity is passed through an aqueous solution of sodium chloride (called brine), it decomposes to form.............?
sodium hydroxide
bleaching powder
baking soda

Q 22:Chemical name of ......... is sodium hydrogencarbonate (NaHCO3).

Washing soda
Baking soda
Bleaching soda

Q 23:Sodium carbonate can be obtained by heating baking soda; recrystallisation of sodium carbonate gives................?
Caustic Soda
Bleaching Soda
Washing Soda

Q 24:On heating .............. at 373 K, it loses water molecules and becomes calcium sulphate hemihydrates (CaSO4.1/2 H2O). This is called Plaster of Paris
gypsum
silica
bordeaux

Q 25:If .............. gas is passed over this heated material (CuO), the black coating on the surface turns brown as the reverse reaction takes place and copper is obtained.
nitrogen
hydrogen
oxygen