All Free Chemistry MCQs with Answers

• A. Chloride ions
• B. Sulfate ions
• C. Phosphate ions
• D. Cr3+ ions

Explanation: The chromyl chloride test is used to detect chloride ions in the qualitative analysis.

• A. Dolomite.
• B. Mgl2
• C. Mg3N2
• D. Epsom salt

Explanation: In 1951 preparation from the elements was first reported involving direct hydrogenation of Mg metal at high pressure and temperature (200…

• A. Li
• B. Na
• C. Mg
• D. Be

Explanation: d) Be (Beryllium): This is the correct option. Beryllium does not react with water.

• A. P2O5
• B. Fe2O3
• C. Silica
• D. FO

Explanation: a) P2O5 (Phosphorus Pentoxide): This is the correct option. Calcium oxide (CaO) reacts with phosphorus pentoxide (P2O5) to form calcium…

• A. Calcium
• B. Barium
• C. Beryllium
• D. Strontium

Explanation: Explanation:Calcium is found in egg shells, sea shells, teeth, and bones.

• A. At high pressure
• B. At room temperature
• C. At high temperature
• D. None of the above

Explanation: Explanation:Molten alkaline earth metal reacts with hydrogen at high pressure and in presence of catalyst forming hydrides.

• A. Calcium
• B. Aluminium
• C. Barium
• D. Iron

Explanation: Explanation:The correct answer is calcium because asbestos is a term used to describe a group of six naturally occurring fibrous minerals…

• A. More basic
• B. No change
• C. Less basic
• D. More acidic

Explanation: Group II metal oxides become more basic as you go down the column. As the electronegativities of the metals decrease down the group, hence…

• A. Carbon.
• B. Nitrogen.
• C. Silicon.
• D. All of these.

Explanation: a) Carbon: This is the correct option. Carbon is the element that forms long chains alternating with oxygen.

• A. 0.7-1.5
• B. 0.1-0.2
• C. 0.2-0.7
• D. 1.6-2.00

Explanation: Plain carbon steel is an alloy of iron and carbon. It has good machinability and malleability.

• A. Nitric oxide
• B. Meta stannic acid.
• C. Ammonium nitrite
• D. None of these.

Explanation: Nitric acid is a very strong acid and is also known as aqua fortis. When metallic tin reacts with concentrated nitric acid it forms…

• A. Pb2O
• B. PbO2
• C. PbO
• D. 2PbCO3.Pb(OH)2

Explanation: a) Pb2O (Lead(II) Oxide): Lead(II) oxide is commonly known as lead oxide or litharge.

• A. Gibbsite
• B. Emerald
• C. Bauxite
• D. Cryolite

Explanation: a) Gibbsite: Gibbsite is a mineral composed of aluminum hydroxide (Al(OH)3). It is not the same as Al2F2SiO4.

• A. Pb2O3
• B. Pb2O
• C. PbO
• D. Pb3O4

Explanation: Explanation:The chemical formula of lead suboxide is Pb2O. This option is not correct.

• A. Hydration
• B. Hydrolysis
• C. Oxidation
• D. Reduction

Explanation: Explanation:Phosphine can be produced by reduction of phosphorous acid (H3PO3) with a reducing agent such as sodium hypophosphite…

• A. CO2
• B. CO
• C. CaO
• D. C

Explanation: A is correct as urea is produced by the reaction of CO2 B is incorrect (fact)C is incorrect (fact)D is incorrect (fact)

• A. 90
• B. 80
• C. 98
• D. 89

Explanation: In contact process, SO3 is formed in 98% of H2SO2

• A. Maleic Acid and Fumaric Acid
• B. Acetic Acid and Formic Acid
• C. Formic Acid and Oxalic Acid
• D. Oxalic Acid and Acetic Acid

Explanation: Explanation:This is an oxidation reaction. Acetone is a symmetrical ketone.

• A. Formic acid
• B. Acetone
• C. Acetaldehyde
• D. Butanone

Explanation: Explanation:Aldehydes react with tollen's reagent . So, the correct answer is C.This option is not correct because it is ethanoic acid.

• A. Sodium borohydride
• B. Sodium bisulphite
• C. Sodium nitroprusside
• D. Fehling's solution

Explanation: A is incorrect as sodium borohydrides converts carbonyl compounds to B is incorrect as sodium bisulphate reacts with carbonyl compounds to…