A water molecule will always contain

11% of oxygen and 89% of hydrogen

18% of oxygen and 88% of hydrogen

11.11% of oxygen and 88.89% of hydrogen

Formula of aluminum sulphate indicates that

for two ions of Al, three ions of sulphate are required

for each ion of Al, two ions of sulphate are required

for each ion of Al, three ions of sulphate are required

for two ions of Al, 3 ions of sulphate are required

for two ions of Al, three ions of sulphate are required

A student-wrote three statements about rancidity:I. When fats and oils are reduced, they become rancid.II. Chips manufacturers usually flush chips bags with oxygen to prevent rancidity.III. Rancidity is prevented by adding substances called antioxidants to food.Choose the correct statement(s).

It will supply oxygen to the burning fire.

Rupali, a class 10 student has set up the apparatus as shown in the figures. Which of the following observations is correct?

Temperature of beakers I, II and III will be raised as dissolution of salts is an exothermic process.

Temperature of beakers III and IV will be raised while temperature of beakers I and II will fall.

Read the given passage and fill in the blanks by choosing an appropriate option.When a limited quantity of water is sprinkled over a dirty white stone called ___i___, an ___ii___ reaction takes place. After some time, the stone like substance changes into white amorphous powder called, ___iii___ which is used for ___iv___.

Carbon dioxide and hydrogen are produced

(i)(ii)(iii)(iv)Plaster of PairsExothermicQuick limeMedical purposes

(i)(ii)(iii)(iv)Quick limeExothermicSlaked limeWhite washing

Carbon dioxide and hydrogen are produced

(i)(ii)(iii)(iv)Calcium carbonateEndothermicCalcium oxideWhite washing

Which of the given chemical equations is NOT balanced?

\[3Fe+4{{H}_{2}}O\to F{{e}_{3}}{{O}_{4}}+4{{H}_{2}}\]

\[KCl{{O}_{3}}\to KCl+{{O}_{2}}\]

\[Mg+2HCl\,\to \,MgC{{l}_{2}}+{{H}_{2}}\]

Which of the following chemical reactions is balanced and also undergoes combustion?

\[6C{{O}_{2}}+12{{H}_{2}}O\to {{C}_{6}}{{H}_{12}}{{O}_{6}}+6{{O}_{2}}+6{{H}_{2}}O\]

\[{{C}_{3}}{{H}_{8}}+5{{O}_{2}}\to 3C{{O}_{2}}+4{{H}_{2}}O\]

\[6C{{O}_{2}}+12{{H}_{2}}O\to {{C}_{6}}{{H}_{12}}{{O}_{6}}+6{{O}_{2}}+6{{H}_{2}}O\]

A good fuel has moderate rate of combustion.

\[2Al+3{{H}_{2}}S{{O}_{4}}\to A{{l}_{2}}{{(S{{O}_{4}})}_{3}}+3{{H}_{2}}\]

The equation given below depicts which type of chemical reaction? \[A+BC\to AC+B\]

Partially burnt carbon particles.

Which one of the following is commonly known as blue vitriol and is used as a fungicide?

Maintaining correct levels of pressure in the tyres

In which one of the following reactions a salt is reacting with a base?

\[NaOH+HCl\xrightarrow{{}}NaCl+{{H}_{2}}O\]

\[Cu{{(OH)}_{2}}+{{H}_{2}}S{{O}_{4}}\xrightarrow{{}}CuS{{O}_{4}}+2{{H}_{2}}O\]

\[6N{{H}_{4}}OH+Al{{(S{{O}_{4}})}_{3}}\xrightarrow{{}}2Al{{(OH)}_{3}}\]\[+3{{(N{{H}_{4}})}_{2}}S{{O}_{4}}\]

Match the following: Column A Column B (i) Chalk [A] \[{{C}_{a}}O\] (ii) Quick lime [B] \[{{C}_{a}}{{(OH)}_{2}}\] (iii) Slaked lime [C] \[NaHC{{O}_{3}}\] (iv) Sodium bicarbonate [D] \[{{C}_{a}}C{{O}_{3}}\]

(i - D), (ii- B), (iii - A), (iv - C)

(i - D), (ii - A), (iii - B), (iv - C)

(i - C), (ii - D), (iii - B), (iv - A)

255 + Mcqs in Chemical Reactions and Equations in Science Page 5 McqOptions

201.	To balance Al(OH)₃ + HNO₃ → Al(NO₃)₃ + H₂O, number of Al(OH)₃ molecules will be
A.	1
B.	2
C.	3
D.	4
Answer» C. 3

Discussion

202.	Natrium is Latin name for
A.	Nickel
B.	Nitrogen
C.	sodium
D.	Stannum
Answer» D. Stannum

Discussion

203.	Formula of copper carbonate is
A.	CuCO₃
B.	CuCO₂
C.	CuCHO₃
D.	CuCOH
Answer» B. CuCO₂

Discussion

204.	Substance is treated both as a radical and an element. It is
A.	sulphate
B.	hydrogen
C.	carbonate
D.	Phosphorus
Answer» C. carbonate

Discussion

205.	All are examples of radicals except
A.	hydroxide
B.	Sulphate
C.	ammonium
D.	aluminum
Answer» E.

Discussion

206.	Valency of hydroxide ion (OH) is
A.	-1
B.	-2
C.	-3
D.	-4
Answer» B. -2

Discussion

207.	A water molecule will always contain
A.	11% of oxygen and 89% of hydrogen
B.	18% of oxygen and 88% of hydrogen
C.	11.11% of oxygen and 88.89% of hydrogen
D.	15% of oxygen
Answer» D. 15% of oxygen

Discussion

208.	Formula of Hydrogen Carbonate ion is
A.	HCO₂
B.	HCO₃
C.	HCO₄
D.	H₂CO₃
Answer» C. HCO₄

Discussion

209.	In Na₂CO₃.10H₂O, percentage of oxygen is
A.	0.1678
B.	0.1608
C.	0.1659
D.	0.1684
Answer» B. 0.1608

Discussion

210.	All of these ions have a valency of +2 except
A.	Pb
B.	Ca
C.	Zn
D.	NH₄
Answer» E.

Discussion

211.	Formula of aluminum sulphate indicates that
A.	for each ion of Al, two ions of sulphate are required
B.	for each ion of Al, three ions of sulphate are required
C.	for two ions of Al, 3 ions of sulphate are required
D.	for two ions of Al, three ions of sulphate are required
Answer» D. for two ions of Al, three ions of sulphate are required

Discussion

212.	Charge on an ion is a measure of its
A.	valency
B.	exponential notation
C.	formula
D.	isotopic charges
Answer» B. exponential notation

Discussion

213.	Color gas is
A.	methane
B.	ethane
C.	propane
D.	butane
Answer» E.

Discussion

214.	If an acid reacts with a carbonate, product will always include
A.	H₂O (l)
B.	a salt (s)
C.	CO₂ (g)
D.	all of these
Answer» E.

Discussion

215.	Relative formula mass of aluminum sulphate (NH₄)₂SO₄ is
A.	132.14g/mol
B.	113.14g/mol
C.	139.33g/mol
D.	143.69g/mol
Answer» B. 113.14g/mol

Discussion

216.	Formula of Calcium Hydrogen Carbonate is
A.	HCO₃Ca₂
B.	Ca(HCO₃)₃
C.	Ca(HCO₃)₂
D.	Ca₂(HCO₃)₂
Answer» D. Ca₂(HCO₃)₂

Discussion

217.	In CuO (Copper Oxide), valency of Copper is
A.	+1
B.	+2
C.	−1
D.	−2
Answer» C. −1

Discussion

218.	In order to get Sodium Sulfite (Na₂SO₃) as product, reactants shall be Sulfur Dioxide (SO₂) and
A.	Na₂CO₃
B.	NaOH
C.	NaCl
D.	both a and b
Answer» E.

Discussion

219.	Relative molecular mass of Na₂CO₃ is
A.	98
B.	128
C.	286
D.	198
Answer» D. 198

Discussion

220.	Formula of Ammonium Sulfate ((NH₄)₂SO₄) is
A.	NH₄(SO₄)₂
B.	NH₄(HSO₄)₂
C.	(NH₄)₂SO₄
D.	(NH₃)2SO₃
Answer» D. (NH₃)2SO₃

Discussion

221.	Variable valencies are used to indicate ions
A.	greater than +1
B.	greater than −1
C.	with more than one valency
D.	all of these
Answer» D. all of these

Discussion

222.	Product obtained from additional polymerization includes
A.	water
B.	only polymer
C.	polyesters
D.	polyamides
Answer» C. polyesters

Discussion

223.	Valency of carbonate ion CO₃? is
A.	-1
B.	-2
C.	-3
D.	-4
Answer» B. -2

Discussion

224.	All are covalent compounds except
A.	NO₂
B.	SO₃
C.	SO₂
D.	HNO₃
Answer» E.

Discussion

225.	Empirical formula is the
A.	simplest formula
B.	molecular formula
C.	chemical formula
D.	ionic exponential formula
Answer» B. molecular formula

Discussion

226.	All of these radicals have a valency of 2, except
A.	SO₄
B.	CO₃
C.	NH₄
D.	MgCO₃
Answer» D. MgCO₃

Discussion

227.	Formula of hydrated Sodium Carbonate is
A.	Na(HCO₃)₂
B.	Na₂CO₃.(H₂O)₅
C.	Na₂CO₃.10H₂O
D.	Na3CO₄.10H₂O
Answer» D. Na3CO₄.10H₂O

Discussion

228.	Chemical formula of silver bromide is
A.	Ag₂Br₃
B.	AgBr
C.	AgBrO
D.	AgBr₃.H₂O
Answer» C. AgBrO

Discussion

229.	Chemical formula of Zinc Hydroxide is
A.	Zn(OH)₂
B.	ZNO₂
C.	Zn₂(OH)₃
D.	ZnOH
Answer» B. ZNO₂

Discussion

230.	Valency of Carbon (C) is
A.	1
B.	2
C.	3
D.	4
Answer» E.

Discussion

231.	Molecular weight of propane (C₃H₈) is
A.	44.095g/mol
B.	40.01g/mol
C.	41.01g/mol
D.	46.02g/mol
Answer» B. 40.01g/mol

Discussion

232.	All are ionic compounds except
A.	AgCl
B.	HNO₃
C.	NO₂
D.	(NH₄)₂CO₃
Answer» D. (NH₄)₂CO₃

Discussion

233.	A student-wrote three statements about rancidity:I. When fats and oils are reduced, they become rancid.II. Chips manufacturers usually flush chips bags with oxygen to prevent rancidity.III. Rancidity is prevented by adding substances called antioxidants to food.Choose the correct statement(s).
A.	I only
B.	II and III only
C.	It will supply oxygen to the burning fire.
D.	All of these
Answer» D. All of these

Discussion

234.	Rupali, a class 10 student has set up the apparatus as shown in the figures. Which of the following observations is correct?
A.	Temperature of beakers I, II and III will be raised as dissolution of salts is an exothermic process.
B.	Temperature of beakers III and IV will be raised while temperature of beakers I and II will fall.
C.	Spontaneous combustion
D.	None of these
Answer» C. Spontaneous combustion

Discussion

235.	Read the given passage and fill in the blanks by choosing an appropriate option.When a limited quantity of water is sprinkled over a dirty white stone called ___i___, an ___ii___ reaction takes place. After some time, the stone like substance changes into white amorphous powder called, ___iii___ which is used for ___iv___.
A.	(i)(ii)(iii)(iv)Plaster of PairsExothermicQuick limeMedical purposes
B.	(i)(ii)(iii)(iv)Quick limeExothermicSlaked limeWhite washing
C.	Carbon dioxide and hydrogen are produced
D.	(i)(ii)(iii)(iv)Calcium carbonateEndothermicCalcium oxideWhite washing
Answer» C. Carbon dioxide and hydrogen are produced

Discussion

236.	Which of the given chemical equations is NOT balanced?
A.	\[3Fe+4{{H}_{2}}O\to F{{e}_{3}}{{O}_{4}}+4{{H}_{2}}\]
B.	\[KCl{{O}_{3}}\to KCl+{{O}_{2}}\]
C.	Candle
D.	\[Mg+2HCl\,\to \,MgC{{l}_{2}}+{{H}_{2}}\]
Answer» C. Candle

Discussion

237.	Which of the following chemical reactions is balanced and also undergoes combustion?
A.	\[{{C}_{3}}{{H}_{8}}+5{{O}_{2}}\to 3C{{O}_{2}}+4{{H}_{2}}O\]
B.	\[6C{{O}_{2}}+12{{H}_{2}}O\to {{C}_{6}}{{H}_{12}}{{O}_{6}}+6{{O}_{2}}+6{{H}_{2}}O\]
C.	A good fuel has moderate rate of combustion.
D.	\[2Al+3{{H}_{2}}S{{O}_{4}}\to A{{l}_{2}}{{(S{{O}_{4}})}_{3}}+3{{H}_{2}}\]
Answer» B. \[6C{{O}_{2}}+12{{H}_{2}}O\to {{C}_{6}}{{H}_{12}}{{O}_{6}}+6{{O}_{2}}+6{{H}_{2}}O\]

Discussion

238.	How is the decomposition of silver chloride carried out?
A.	By electricity
B.	By sunlight
C.	Light
D.	By water
Answer» C. Light

Discussion

239.	In which reaction do two compounds exchange their ions to form two new compounds?
A.	Displacement reaction
B.	Double displacement reaction
C.	Biomass
D.	Decomposition reaction
Answer» C. Biomass

Discussion

240.	What is the reaction in which a substance or substances undergo change to produce new substances with new properties called?
A.	A biochemical reaction
B.	A nuclear reaction
C.	Coal tar
D.	A chemical reaction
Answer» E.

Discussion

241.	Which type of reaction is given below? \[CuS{{O}_{4}}+Fe\xrightarrow{{}}FeS{{O}_{4}}+Cu\]
A.	Neutralisation
B.	Combination
C.	a-3, b-2, c-4, d-1
D.	Decomposition
E.	None of these
Answer» D. Decomposition

Discussion

242.	The destruction of a material containing metals due to chemical reactions with its surroundings is called:
A.	Rancidity
B.	Photosynthesis
C.	In the middle portion
D.	Corrosion
E.	None of these
Answer» E. None of these

Discussion

243.	The equation given below depicts which type of chemical reaction? \[A+BC\to AC+B\]
A.	Combustion
B.	Combination
C.	Partially burnt carbon particles.
D.	Single displacement
E.	None of these
Answer» E. None of these

Discussion

244.	Which one of the following is true, if a substance has a pH value of 7?
A.	The substance is a base.
B.	The substance is an acid.
C.	Lubricating
D.	Either [a] and [b]
E.	None of these
Answer» D. Either [a] and [b]

Discussion

245.	Which one of the following is true, if a substance has a pH value of 4?
A.	The substance is a base.
B.	The substance is an acid.
C.	Paints
D.	Either [a] or [b]
E.	None of these
Answer» C. Paints

Discussion

246.	Which one of the following is formed when sodium hydrogen carbonate reacts with hydrochloric acid?
A.	Sodium chloride
B.	Carbon dioxide
C.	(i), (ii) and (iv)
D.	All the above
E.	None of these
Answer» E. None of these

Discussion

247.	Which one of the following is commonly known as blue vitriol and is used as a fungicide?
A.	Potassium nitrate
B.	Copper sulphate
C.	Maintaining correct levels of pressure in the tyres
D.	Sodium chloride
E.	None of these
Answer» C. Maintaining correct levels of pressure in the tyres

Discussion

248.	In which one of the following reactions a salt is reacting with a base?
A.	\[NaOH+HCl\xrightarrow{{}}NaCl+{{H}_{2}}O\]
B.	\[Cu{{(OH)}_{2}}+{{H}_{2}}S{{O}_{4}}\xrightarrow{{}}CuS{{O}_{4}}+2{{H}_{2}}O\]
C.	A is correct and R is wrong.
D.	\[6N{{H}_{4}}OH+Al{{(S{{O}_{4}})}_{3}}\xrightarrow{{}}2Al{{(OH)}_{3}}\]\[+3{{(N{{H}_{4}})}_{2}}S{{O}_{4}}\]
E.	None of these
Answer» E. None of these

Discussion

249.	Match the following: Column A Column B (i) Chalk [A] \[{{C}_{a}}O\] (ii) Quick lime [B] \[{{C}_{a}}{{(OH)}_{2}}\] (iii) Slaked lime [C] \[NaHC{{O}_{3}}\] (iv) Sodium bicarbonate [D] \[{{C}_{a}}C{{O}_{3}}\]
A.	(i - D), (ii- B), (iii - A), (iv - C)
B.	(i - D), (ii - A), (iii - B), (iv - C)
C.	Moth balls
D.	(i - C), (ii - D), (iii - B), (iv - A)
E.	None of these
Answer» C. Moth balls

Discussion

250.	Which one among the following is a weak base?
A.	Sodium hydroxide
B.	Potassium hydroxide
C.	CROFK
D.	All the above
E.	None of these
Answer» D. All the above

Discussion

Explore topic-wise MCQs in Science.

To balance Al(OH)₃ + HNO₃ → Al(NO₃)₃ + H₂O, number of Al(OH)₃ molecules will be

Natrium is Latin name for

Formula of copper carbonate is

Substance is treated both as a radical and an element. It is

All are examples of radicals except

Valency of hydroxide ion (OH) is

A water molecule will always contain

Formula of Hydrogen Carbonate ion is

In Na₂CO₃.10H₂O, percentage of oxygen is

All of these ions have a valency of +2 except

Formula of aluminum sulphate indicates that

Charge on an ion is a measure of its

Color gas is

If an acid reacts with a carbonate, product will always include

Relative formula mass of aluminum sulphate (NH₄)₂SO₄ is

Formula of Calcium Hydrogen Carbonate is

In CuO (Copper Oxide), valency of Copper is

In order to get Sodium Sulfite (Na₂SO₃) as product, reactants shall be Sulfur Dioxide (SO₂) and

Relative molecular mass of Na₂CO₃ is

Formula of Ammonium Sulfate ((NH₄)₂SO₄) is

Variable valencies are used to indicate ions

Product obtained from additional polymerization includes

Valency of carbonate ion CO₃? is

All are covalent compounds except

Empirical formula is the

All of these radicals have a valency of 2, except

Formula of hydrated Sodium Carbonate is

Chemical formula of silver bromide is

Chemical formula of Zinc Hydroxide is

Valency of Carbon (C) is

Molecular weight of propane (C₃H₈) is

All are ionic compounds except

A student-wrote three statements about rancidity:I. When fats and oils are reduced, they become rancid.II. Chips manufacturers usually flush chips bags with oxygen to prevent rancidity.III. Rancidity is prevented by adding substances called antioxidants to food.Choose the correct statement(s).

Rupali, a class 10 student has set up the apparatus as shown in the figures. Which of the following observations is correct?

Which of the given chemical equations is NOT balanced?

Which of the following chemical reactions is balanced and also undergoes combustion?

How is the decomposition of silver chloride carried out?

In which reaction do two compounds exchange their ions to form two new compounds?

What is the reaction in which a substance or substances undergo change to produce new substances with new properties called?

Which type of reaction is given below? \[CuS{{O}_{4}}+Fe\xrightarrow{{}}FeS{{O}_{4}}+Cu\]

The destruction of a material containing metals due to chemical reactions with its surroundings is called:

The equation given below depicts which type of chemical reaction? \[A+BC\to AC+B\]

Which one of the following is true, if a substance has a pH value of 7?

Which one of the following is true, if a substance has a pH value of 4?

Which one of the following is formed when sodium hydrogen carbonate reacts with hydrochloric acid?

Which one of the following is commonly known as blue vitriol and is used as a fungicide?

In which one of the following reactions a salt is reacting with a base?

Match the following: Column A Column B (i) Chalk [A] \[{{C}_{a}}O\] (ii) Quick lime [B] \[{{C}_{a}}{{(OH)}_{2}}\] (iii) Slaked lime [C] \[NaHC{{O}_{3}}\] (iv) Sodium bicarbonate [D] \[{{C}_{a}}C{{O}_{3}}\]

Which one among the following is a weak base?