Chemical Reaction and Equations class 10 Most Important MCQ’s

Chemical Reaction and Equations Most Important MCQ’s Question and answers

Chemical Reaction and Equations MCQ’s

Question:1 Reaction of Magnesium” with air is

1. Exothermic Reaction
2. Endothermic Reaction
3. Reversible Reaction
4. Substitution Reaction

Question:2 what Chemicals are used in Firework?

1. Copper Chloride
2. Calcium Chloride
3. Barium Chloride
4. all of above

Question:3 when a magnesium ribbon in air, the ash formed is

1. Black
2. white
3. yellow
4. pink

Question:4 Color of magnesium oxide is

1. white
2. blue
3. grey
4. pink

Question:5 if magnesium is gently heated, it forms

1. magnesium oxide
2. magnesium sulfide
3. magnesium nitnte
4. Magnesium carbonate

Question:6 when carbon dioxide is passed through lime water

1. Calcium hydroxide is formed
2. white precipitate of CaO is formed
3. lime water turns milky
4. color of time water disappears

Question;7 when Crystals of lead nitrate are heated strongly in a dry test tube

1. Crystals immediately melt
2. A brown residue is left
3. white fumes appear in the tube
4. A yellow residue is left

Question:8 Color of solid magnesium is

1. Dark grey
2. silver grey
3. black
4. whitish silver

Question:9 In writing Chemical equations, inclusion of state symbols shall be done while

1. Correct Chemical formulae of reactants and products are written
2. the equation is being balanced to fulfill the law of Conservation of mass
3. the equation has been balanced
4. the Chemical formulae of products and reactants have been Changed to bring about quick balancing

Question:10 Consider reaction :Na (s)+O₂(g)->Na₂O(s), Moles of sodium needed to balance equation would be

1. 1
2. 2
3. 3
4. 4

Question:11 Consider reaction :S(s)+O₂(g)+O₂(g)->SO₂, state of SO₂ in this reaction is

1. Liquid
2. solid
3. Gaseous
4. All three

Question:12 Consider reaction :Na(s)+O₂(g)->Na₂O , moles of oxygen needed to balance equation are

1. 1
2. 2
3. 3
4. 4

Question:13 Consider reaction: AI(s)+O₂(g)->AI₂O₃, Moles of AI(s) needed to balance equation are

1. 1
2. 2
3. 3
4. 4

Question:14 which one of the given processes involves Chemical reaction?

1. storing of oxygen gas under pressure in a gas cylinder
2. keeping petrol in a China dish in the open
3. liquefaction of air
4. heating copper write in the presence of air at high temperature

Question:15 In which of the given Chemical equations the abbreviations represent correct states of the reactants and products involved at reaction temperature?

1. 2H₂(I)+O₂(I)->2H₂O(g)
2. 2H₂(g)+O₂(I)->2H₂O(g)
3. 2H₂(g)+O₂(g)->2H₂O(I)
4. 2H₂(g)+O₂(g)->2H₂O(g)

Question:16 the reaction in which two compounds exchange their ions to form two new compounds is called

1. Displacement reaction
2. Combination reaction
3. Double displacement reaction
4. Redox reaction

Question:17 On immersing an iron in CuSO₄ solution for a few minutes you will observe

1. No, reaction takes place
2. the color of solution fades away
3. the surface of iron nails acquire a black coating
4. the color of solution Changes to green

Question:18 Which of the given statements is not a physical Change ?

1. Boiling of water to give water vapour
2. Melting of ice to give water
3. dissolution of salt in water
4. Combination of liquefied petroleum Gas (LPG)

Question:19 The reaction of H₂ gas with Oxygen gas to form water is an example of

1. Combination reaction
2. Redox reaction
3. Exothermic reaction
4. all of these reaction

Question:20 Rancidity can be prevented by

1. Adding antioxidants
2. storing food from light
3. keeping food in refrigerator
4. all of these

Answers

Q.No	Answer	Q.No	Answer
1	A	11	C
2	D	12	B
3	B	13	D
4	A	14	D
5	A	15	C
6	C	16	C
7	D	17	D
8	B	18	D
9	B	19	A
10	D	20	D