Acids Bases and Salts Class 7 MCQ. We covered all the Acids Bases and Salts Class 7 MCQ in this post for free so that you can practice well for the exam.
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MCQ on Acids Bases and Salts for Students for Class 7 Students
The human stomach produces acid ‘X’ which helps in the digestion of food. Acid ‘X’ is
(a) acetic acid
(b) methanoic acid
(c) hydrochloric acid
(d) citric acid
Option c – hydrochloric acid
Sometimes, indigestion is caused by the secretion of too much hydrochloric acid in the stomach. To ease the pain caused, a tablet can be taken that reacts to reduce the amount of acid present. Which one among the following would be inappropriate for a manufacturer to include as a major reactant in the tablet?
(a) CaCO3
(b) MgCO3
(c) NaOH
(d) Mg(OH)2
Option c – NaOH
Which one among the following is the equivalent weight of sulphuric acid? (Atomic weight : H = 1, S = 32, O =16)
(a) 98
(b) 60
(c) 100
(d) 49
Option d – 49
Hydrofluoric acid is not kept in glass bottles because it reacts with
(a) visible light
(b) sodium oxide of glass
(c) aluminum oxide of glass
(d) silicon dioxide in glass
Option c – aluminum oxide of glass
Which calcium compound does not increase the pH of acidic soils?
(a) Calcium carbonate
(b) Calcium hydroxide
(c) Calcium oxide
(d) Calcium sulphate
Option d – Calcium sulphate
The same acid solution is taken in two test tubes. Zinc is introduced in the first test tube and magnesium in the second. A gas is evolved in the second test tube which burns with a pop sound while no gas is evolved from the first. Identify the acid solution taken in the two test tubes.
(a) HCI
(b) HNO3
(c) H₂SO4
(d) H3PO4
Option b – HNO3
Which of the following represents the correct order of the acidic strength for equimolar aqueous solutions of HCl, H2SO4, NH4OH, and NaOH
(a) HCI <NH4OH < NaOH <H₂SO4
(b) NH4OH <NaOH <H₂SO4 <HCI
(c) HCI<H2SO4 <NH4OH< NaOH
(d) NaOH <NH4OH<HCI <H₂SO4
Option d – NaOH
Which one of the following acids is used for etching glass?
(a) H₂SO4
(b) HNO3
(c) HF
(d) HCI
Option c – HF
Iodized salt contains
(a) Free iodine
(b) Calcium iodine
(c) Magnesium iodine
(d) Potassium Iodine
Option d – Potassium Iodine
Sodium stearate is a salt and is used
(a) in gunpowder
(b) in paint
(c) to make soap
(d) to make fertilizer
Option c – to make soap
Vinegar is an aqueous solution of
(a) Oxalic acid
(b) Citric acid
(c) Hydrochloric acid
(d) Acetic acid
Option d – Acetic acid
Which of the following acids does not contain oxygen?
(a) Nitric acid
(b) Sulphuric acid
(c) Hydrochloric acid
(d) All of the above
Option c – Hydrochloric acid
Which of the following statement is wrong about sodium hydroxide?
(a) It is a deliquescent substance
(b) It is corrosive
(c) It dissolves ferric oxide
(d) It releases hydrogen gas with aluminum
Option c – It dissolves ferric oxide
Which of the following can dissolve limestone?
(a) NH3 + H2O
(b) NaOH + H₂O
(c) CaO + H2O
(d) CO₂ + H₂O
Option d – CO₂ + H₂O
Chemical ‘A’ is used for water softening to remove temporary hardness. ‘A’ reacts with sodium carbonate to generate caustic soda. What is ‘A’?
(a) Gypsum
(b) Slaked lime
(c) Quick lime
(d) Limestone
Option b – Slaked lime
Which of the following solution has the lowest pH value?
(a) 0.1 Molar NaCl solution
(b) 0.01 Molar NaHCO3 solution
(c) 0.001 Molar Na2CO3 solution
(d) 0.01 Molar NaOH solution
Option a – 0.1 Molar NaCl solution
A boy touches the leaves of a nettle plant and feels a burning pain. What is the reason?
(a) A layer of sulphuric acid is present on the leaves of the nettle plants.
(b) A layer of acidic salts is present on its hair around the nettle leaf.
(c) The stinging hair of the plant injects methanoic acid.
(d) The stinging hair of the plant injects magnesium hydroxide.
Option c – The stinging hair of the plant injects methanoic acid
The acidic soil which is not good for the healthy growth of plants is neutralized by
(a) ammonium hydroxide (NH4OH)
(b) calcium oxide (CaO)
(c) sodium hydroxide (NaOH)
(d) magnesium hydroxide (Mg (OH)2
Option b – calcium oxide (CaO)
Presence of which of the following acid causes indigestion :
(a) Citric acid
(b) Oxalic acid
(c) Acetic acid
(d) Hydrochloric acid.
Option d – Hydrochloric acid
Which of the following gives the correct increasing order of acidic strength?
(a) Water < Acetic acid <Hydrochloric acid
(b) Water <Hydrochloric acid <Acetic acid
(c) Acetic acid < Water <Hydrochloric acid
(d) Hydrochloric acid <Water <Acetic acid
Option a – Water
We covered all the acids bases and salts class 7 mcq above in this post for free so that you can practice well for the exam.
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