Chemical Reaction and Equation MCQ. We covered all the Chemical Reaction and Equation MCQ in this post for free so that you can practice well for the exam.
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Chemical Reaction and Equation MCQ for Students
Which of the following are correctly matched? 1. Combination reaction – formation of a single product. 2. Decomposition reaction – break down of a single entity. 3. Thermal decomposition – heat is used. 4. Displacement reaction – based on reactivity series.
(a) 1, 2, and 3
(b) 1, 2, and 4
(c) 1, 3, and 4
(d) 1, 2, 3, and 4
Option d – 1, 2, 3, and 4
Which of the following is the observation of the chemical reaction? 1. Change in state 2. Evolution of a gas 3. Change in color 4. Change in temperature
(a) 1, 2, and 3
(b) 1, 2, and 4
(c) 1, 3, and 4
(d) 1, 2, 3, and 4
Option d – 1, 2, 3, and 4
Which of the following are correctly matched? 1. Reactant – a substance that undergoes change 2. Product – new substance 3. Chemical reaction – simplest form
(a) 1 and 2
(b) 2 and 3
(c) 1 and 3
(d) 1, 2, and 3
Option a – 1 and 2
Which of the following is/are correct for a balanced chemical equation? 1. It is based on the law of conservation of mass. 2. The physical states make the chemical reaction less informative.
(a) Only 1
(b) Only 2
(c) Both 1 and 2
(d) Neither 1 nor 2
Option a – Only 1
Which of the statements about the reaction below are correct? 2PbO(s)+C(s)→2Pb(s)+CO2(g) 1. Lead is getting reduced. 2. Carbon dioxide is getting oxidized. 3. Carbon is getting oxidized. 4. Lead oxide is getting reduced.
(a) 1 and 2
(b) 1 and 3
(c) 1, 2, and 3
(d) All of the above
Option b – 1 and 3
The filling up of valence orbital with 8 electrons is referred to as
1. Octet Configuration
2. Hexet configuration
3. Tetret Configuration
4. All the above
Option 1 – Octet Configuration
The following are more stable
1. Individual atoms
2. Combined state of atoms
3. Individual ions
4. All the above
Option 2 – Combined state of atoms
Each Hydrogen has
1. An unpaired electron
2. paired electron
3. Two unpaired electrons
4. Three unpaired electrons
Option 1 – An unpaired electron
How many unpaired electrons present in Fluorine atom in its ground state
1.0
2.1
3.2
4.3
Option 2 – 1
The end part of an orbital overlaps with the end of another orbital the resultant bond formed by such an overlap is called
1. Sigma bond
2. Pi bond
3. Ionic bond
4. Hydrogen bond
Option 1 – Sigma bond
Which of the following bond is strong
1. Sigma bond
2. π-bond
3. Hydrogen bond
4. None
Option 1 – Sigma bond
Complete transfer of electrons from one atom to another leads to the formation of
1. Ionic bond
2. Covalent bond
3. Coordinate covalent bond
4. Hydrozen bond
Option 1 – Ionic bond
The bond formed due to sharing of electrons between two atoms
1. Ionic bond
2. Covalent bond
3. Coordinate bond
4. Hydrogen bond
Option 2 – Covalent bond
What is most stable electronic Configuration
1. Occupation of valence orbital by 2 electrons
2. Occupation of valence orbital by 8 electrons
3. (1) and (2)
4. None of the above
Option 3 – (1) and (2)
How many unpaired electrons does oxygen has?
1.0
2.1
3.2
4.3
Option 3 – 2
An orbital overlaps with another side ways the bond formed by such an overlap is called
1. “Sigma” bond
2. “Pi” bond
3. “Vanderval” bond
4. all the above
Option 2 – “Pi” bond
Consider the following statements : (A) Green crystals of ferrous sulphate become dirty white upon strong heating. (B) The chemical formula of aluminium phosphate is AI(PO4)3. (C) Silver salts are most sensitive to light. (D) The gas released in respiration is oxygen. Which of the above statements is correct?
(a) Only (A)
(b) Only (B)
(c) Only (C)
(d) Only (D)
Option c – Only (C)
Magnesium ribbon is rubbed with sandpaper before making it burn. The reason for rubbing the ribbon is to :
(a) remove moisture condensed over the surface of the ribbon.
(b) generate heat due to exothermic reaction
(c) remove the surface of magnesium oxide formed over the magnesium.
(d) mix silicon dioxide) with sandpaper (silicon magnesium for the temperature of the lowering ignition ribbon.
Option c – remove the surface of magnesium oxide formed over the magnesium
The reaction that differs from the rest of the reactions given is :
(a) formation of calcium oxide from limestone
(b) formation of aluminium from aluminium oxide
(c) formation of sodium carbonate from sodium hydrogen carbonate
(d) formation of mercury from mercuric oxide
Option b – formation of aluminium from aluminium oxide
When sodium hydrogen carbonate powder is added to acetic acid, gas evolves. Which one of the following statements a is not true for this gas? It
(a) turns lime water milky
(b) extinguishes a burning splinter
(c) dissolves in a solution of sodium hydroxide
(d) reacts with water to form sulphuric acid
Option d – reacts with water to form sulphuric acid
During the preparation of hydrogen chloride gas on a humid day, the gas is usually passed through the guard tube containing anhydrous calcium chloride. The role of anhydrous calcium chloride taken in the guard tube is to
(a) absorb the evolved gas
(b) moisten the gas
(c) absorb moisture from the gas
(d) absorb Cl ions from the evolved gas
Option c – absorb moisture from the gas
The element that cannot be used as a reducing agent is
(a) carbon
(b) aluminium
(c) sulphur
(d) sodium
Option c – sulphur
Barely is ground to powder. The powder is mixed with water and some yeast. The mixture is kept in a closed and moist container. Which of the following will be produced?
(a) Sodium bicarbonate
(b) Alcohol only
(c) Carbon dioxide only
(d) Alcohol and Carbon dioxide
Option d – Alcohol and Carbon dioxide
Which of the following is a chemical change?
(a) Melting of ice
(b) Burning of magnesium in the air
(c) Dissolution of sugar in water
(d) Blowing of wind
Option b – Burning of magnesium in the air
A highly reactive element (X) reacts with oxygen in the air even at room temperature to give an oxide (Y). The oxide (Y) is soluble in water. The aqueous solution of (Y) does not change the colour of the red litmus solution but reacts with an aqueous solution of sodium hydroxide. The (X) is
(a) sodium
(b) phosphorus
(c) carbon
(d) sulphur
Option b – phosphorus
Which of the following is a chemical change? A. Bubbling of oxygen gas through the water. B. Burning of wax of a candle. C. Emitting of light from an electric bulb on passing electric current. D. Passing of carbon dioxide gas through lime water.
(a) A and B
(b) C and D
(c) B and D
(d) A and D
Option c – B and D
Which one of the following elements is least reactive with water?
(a) Lithium
(b) Sodium
(c) Potassium
(d) Cesium
Option a – Lithium
How many covalent bonds are present in a Chloropropane molecule having the molecular formula, C3H7C1?
(a) 6
(b) 8
(c) 9
(d) 10
Option d – 10
Which one of the following chemical reactions is not feasible?
(a) Fe + CuSO4 → FeSO4 + Cu
(b) Zn + CuSO4 → ZnSO4 + Cu
(c) Cu + PbCl₂ → CuCl₂ + Pb
(d) Mg + CuSO4 → MgSO4 + Cu
Option c – Cu + PbCl₂ → CuCl₂ + Pb
The number of water molecules associated with copper sulphate molecules to form crystals is
(a) 2
(b) 4
(c) 5
(d) 6
Option c – 5
The PCl5 molecule has a trigonal bipyramidal structure. Therefore, the hybridization of p orbitals should be
(a) sp²
(b) sp³
(c) dsp²
(d) dsp³
Option d – dsp³
The compound containing both an ionic and a covalent bond is
(a) AlBr3
(b) CaO
(c) MgCl2
(d) NH4Cl
Option d – NH4Cl
Which one of the following oxides dissolves in water?
(a) CuO
(b) Al₂O3
(c) Fe₂O3
(d) Na₂O
Option d – Na₂O
Which one of the following elements will not react with dilute HCl to produce H₂?
(a) Hg
(b) Al
(c) Mg
(d) Fe
Option a – Hg
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