Chemistry set 1 MCQs

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Showing 504 questions
Q.181 Which of the following minerals are also used as mild abrasives in toothpaste?
A Mercury, graphite, diamond
B Micas, chlorite, talc, and serpentine
C Calcite, magnesite, dolomite
D Pyrite, galena, sphalerite
Discuss / Board
Q.182 The valency of Ca is 2+. The valency of O is 2−. What is the simplified chemical formula of Calcium oxide?
A Ca2O2
B CaO
C CaO2
D Ca2O
Discuss / Board
Q.183 What is the name of the compound with the formula N2O5?
A Nitrogen dioxide
B Nitric oxide
C Nitrous oxide
D Dinitrogen pentoxide
Discuss / Board
Q.184 Why cannot we write the chemical formula of a compound formed by chlorine and sodium as ClNa instead of NaCl?
A isotopes
B ions
C nucleons
D electrons
Discuss / Board
Q.185 What is the chemical reaction that occurs when fats or oils combine with a strong alkali, such as sodium hydroxide, to make soap?
A Saponification
B Combustion
C Fermentation
D Oxidation
Discuss / Board
Q.186 What is the most common factor for the yellowing of the Taj Mahal gradually over the years?
A Carbon monoxide present in air
B Marble turns yellow with time
C Marble reacts with nitrogen in air
D Acid rain
Discuss / Board
Q.187 Since the attraction between molecules of gas is very low, what benefit do we get from this property of gas?
A Changing the kinetic energy in the particles of the matter
B Changing the temperature of the matter
C It allows gases to be highly compressed into small volumes
D Changing the colour of the matter
Discuss / Board
Q.188 Name a sublimable substance that can be converted into gas without passing through any intermediate liquid phase.
A Naphthalene
B Chalk Powder
C Alum
D Rust
Discuss / Board
Q.189 Which white powder, ubiquitous in modern kitchens, combines with acid to produce carbon dioxide?
A Sodium fluoride
B Sodium phosphate
C Sodium bicarbonate
D Sodium nitrate
Discuss / Board
Q.190 Calcium hydroxide is the chemical name of which of the following saturated aqueous solutions?
A Hard water
B Black Water
C Limewater
D Carbonated water
Discuss / Board
Q.191 If an atom has atomic number = 6 and number of neutrons = 10, then what is the atomic mass of the atom?
A 4
B 16
C 10
D 6
Discuss / Board
Q.192 The process by which molecules from a region of higher concentration move to a region of lower concentration is known as:
A Osmosis
B Active transport
C Diffusion
D Sublimation
Discuss / Board
Q.193 Before starting a 5 day and 5 night excursion, Mr. Patel provided all his students with battery powered flash lights. What chemical process inside the batteries helps them produce electricity?
A Conversion of chemical energy to electrical energy
B Conversion of mechanical energy to electrical energy
C Nuclear fission
D Thermal expansion
Discuss / Board
Q.194 Which chemical compound is responsible for the spicy taste in chilli peppers?
A Capsaicin
B Caffeine
C Ethanol
D Tannin
Discuss / Board
Q.195 Which of the following is the chemical formula of baking soda?
A Na2CO3 ⋅ 10H2O
B NaOH
C CaOCl2
D NaHCO3
Discuss / Board
Q.196 What is the impact of ocean acidification on coral reefs and shell-forming organisms?
A Ocean acidification has no impact on coral reefs.
B Ocean acidification enhances coral growth.
C Ocean acidification weakens coral skeletons and affects shell formation.
D Ocean acidification increases coral biodiversity.
Discuss / Board
Q.197 After realising the deadly effects of depleting the ozone layer, under which programme was the decision taken to ban the usage of CFC?
A Kyoto Protocol
B Montreal Protocol
C Paris Agreement
D Agenda 21
Discuss / Board
Q.198 Brine water is saturated or strongly impregnated with which of the following ionic compounds?
A Sodium bromide
B Sodium chloride
C Sodium iodide
D Sodium hydroxide
Discuss / Board
Q.199 Which is the correct formula to calculate the formula unit mass of a compound?
A Multiplication of all the atomic masses of all the atoms within the formula
B Summation of all the atomic weights of all the atoms within the formula
C Summation of all the atomic masses of all the atoms within the formula
D Multiplication of all the atomic weights of all the atoms within the formula
Discuss / Board
Q.200 Which chemical reaction occurs when you mix vinegar (acetic acid) and baking soda (sodium bicarbonate)?
A Oxidation
B Precipitation
C Neutralisation
D Combustion
Discuss / Board
Q.201 Which compound is used to neutralise fatty acids and convert them into salts in a process called saponification?
A Sodium fluoride
B Sodium acetate
C Sodium chlorate
D Sodium hydroxide
Discuss / Board
Q.202 Boron is the only metalloid of which group of the periodic table?
A Group 1
B Group 2
C Group 17
D Group 13
Discuss / Board
Q.203 Which element is a transition metal in Group 9 of the periodic table?
A Cobalt (Co)
B Copper (Cu)
C Nickel (Ni)
D Iron (Fe)
Discuss / Board
Q.204 Which of the following elements has the highest electron affinity in the periodic table?
A fluorine
B chlorine
C oxygen
D iodine
Discuss / Board
Q.205 In a redox reaction, the substance that undergoes a decrease in its oxidation number is known as the:
A reducing agent
B oxidizing agent
C catalyst
D auto-catalyst
Discuss / Board
Q.206 Which gas is primarily responsible for the 'puffed up' appearance of bread or cake during baking?
A oxygen
B nitrogen
C carbon dioxide
D methane
Discuss / Board
Q.207 The aqueous solution of which of the following salts will turn blue litmus red?
A sodium chloride
B potassium nitrate
C ammonium chloride
D sodium acetate
Discuss / Board
Q.208 Which principle states that no two electrons in an atom can have the same set of four quantum numbers?
A aufbau principle
B hunds rule
C pauli exclusion principle
D heisenberg uncertainty principle
Discuss / Board
Q.209 The process of removing heavier impurities from ore using a stream of water is called:
A froth flotation
B magnetic separation
C hydraulic washing
D leaching
Discuss / Board
Q.210 Which of the following is an example of a coordinate covalent bond?
A h2
B nacl
C nh4+
D ch4
Discuss / Board

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