TS 10th Class Physical Science Bits Chapter 2 Chemical Equations

These TS 10th Class Physical Science Bits with Answers Chapter 2 Chemical Equations will help students to enhance their time management skills.

TS 10th Class Physical Science Bits Chapter 2 Chemical Equations

Question 1.
What happens when die. Hydrochloric acid is added to iron filings. ( )
(A) hydrogen gas and iron chloride are produced
(B) chlorine gas and iron hydroxide are produced
(C) no reaction takes place
(D) iron salt and water are produced
Answer:
(A) hydrogen gas and iron chloride are produced

Question 2.
In the chemical reaction the symbol Δ represents ( )
(A) compressing
(B) heating
(C) cooling
(D) smelting
Answer:
(B) heating

Question 3.
The reaction is which heat is absorbed is called ( )
(A) exothermic reaction
(B) endothermic reation
(C) catalytic reaction
(D) reversible reaction
Answer:
(B) endothermic reaction

Question 4.
Identify the exothermic reaction among the following. ( )
(A) C+O₂ → CO₂
(B) N₂+O₂ → 2NO
(C) CaO+H₂O → Ca(OH)₂
(D) all the above
Answer:
(A) C+O₂ → CO₂

Question 5.
Atomic mass of oxygen ( )
(A) 8U
(B) 23U
(C) 27U
(D) 16U
Answer:
(D) 16U

Question 6.
Chemical reactions occur with the ……………………. of chemical bonds. ( )
(A) formation
(B) breaking
(C) both A&B
(D) none
Answer:
(B) breaking

Question 7.
The metal formed when zinc reacts with AgNO₃ is ( )
(A) Au
(B) Ag
(C) Al
(D) Cu
Answer:
(B) Ag

Question 8.
The substances that are present on right side of a chemical equation are called; ( )
(A) reactants
(B) oxidants
(C) reductants
(D) products
Answer:
(D) products

Question 9.
The formula of hypochlorous acid is ( )
(A) HCl
(B) H₂SO₄
(C) HOCl
(D) H₂Cl₃
Answer:
(C) HOCl

Question 10.
Every gas at STP occupies 22.4 liters and it ¡s known as ( )
(A) gram molecular weight
(B) gram equivalent weight
(C) gram molecular mass
(D) gram molecular volume
Answer:
(D) gram molecular volume

Question 11.
Burning of liquid petroleum gas (LPG) is a ………………….. change. ( )
(A) physical
(B) chemical
(C) both A&B
(D) neither physical nor chemical
Answer:
(B) chemical

Question 12.
Identify the balanced equatIon among ( )
(A) H₂+O₂ → 2H₂O
(B) H₂+O₂ → 2HO₂
(C) 2H₂+O₂ → 2H₂O
(D) H₂+2O₂ → H₂O₄
Answer:
(C) 2H₂+O₂ → 2H₂O

Question 13.
In exothermic reactions, heat energy is ( )
(A) absorbed
(B) created
(C) released
(D) none of these
Answer:
(C) released

Question 14.
What happens when dli hydrochloric acid is added to iron fillings? Choose the correct answer. ( )
(A) hydrogen gas and iron chloride are produced
(B) chlorine gas and iron hydroxide are produced
(C) no reaction takes place
(D) iron salt and water are produced
Answer:
(C) no reaction takes place

Question 15.
Downward arrow (↓) In a chemical equation indicates ( )
(A) Direction
(B) Gas
(C) Precipitation
(D) No reaction
Answer:
(C) Precipitation

Question 16.
Which of the following is a skeleton reaction? ( )
(A) C₃H₈+O₂ → CO₂+H₂O
(B) Fe₂O₃+2Al→ 2Fe+Al₂O₃
(C) AgNO₃+Nacl → AgCl+NaNo₃
(D) Ca(OH)₂+CO₂ → CaCO₃+H₂O
Answer:
(A) C₃H₈+O₂ → CO₂+H₂O

Question 17.
A solution of sodium carbonate reacts with Ca(OH)₂ to give ( )
(A) CaCO₃
(B) NaOH
(C) both A and B
(D) Cao
Answer:
(C) both A and B

Question 18.
C₆H₂O₆+6O₂ → …………. + 6H₂O+Q ( )
(A) CO₂
(B) 6CO₂
(C) 3CO₂
(D) 4CO₂
Answer:
(B) 6CO₂

Question 19.
Na₂SO₄+ ………………. → BaSO₄+2NaCl ( )
(A) BaCl₂
(B) 2BaCl
(C) Ba₂Cl
(D) BaCl
Answer:
(A) BaCl₂

Question 20.
…………… ( )
(A) 2O₂
(B) 2O₃
(C) O₂
(D) 3O₂
Answer:
(D) 3O₂

Question 21.
The reaction Zn + H₂SO₄ →ZnSO₄+H₂ represents reaction. ( )
(A) Combination
(B) double displacement
(C) displacement
(D) decomposition
Answer:
(C) displacement

Question 22.
A balanced equation contains ( )
(A) Equal number of moles of reactants and products
(B) Equal number of molecules of reactants and products
(C) Equal number of atoms of different elements on reactant side and product side
(D) All the above
Answer:
(D) All the above

Question 23.
The number of molecules present in 1g of Hydrogen is ( )
(A) 6 x 10²³
(B) 3 x 10²³
(C) 1 x 10²³
(D) 2 x 10²³
Answer:
(B) 3 x 10²³

Question 24.
Choose double displacement reaction ( )
(A) X+YZ → XZ+Y
(B) X+Y→XY
(C) XYZ→XY + Z
(D) XV + AB → AX + BY
Answer:
(D) XV + AB → AX + BY

Question 25.
Which information is not conveyed by a balanced equation? ( )
(A) Symbols and formulae of all the substances involved in a particular reaction.
(B) Number of atoms/molecules of the reactants and products involved
(C) Physical states of reactants and products
(D) Whether a particular reaction is actually possible or not.
Answer:
(C) Physical states of reactants and products

Question 26.
Which of the following is not a balanced equation? ( )
(A) Fe + Cl₂ →FeCl₃
(B) Zn +S → ZnS
(C) Mg + CuSO₄ → MgSO₄ + Cu
(D) NaOH + HCl → NaCl+ H₂O
Answer:
(A) Fe + Cl₂ →FeCl₃

Question 27.
Which of the following gases indicates the brown fumes liberating in the boiling tube, when lead nitrate is heated? ( )
(A) H₂
(B) O₂
(C) CO₂
(D) NO₂
Answer:
(D) NO₂

Question 28.
The reaction that takes place when quicklime is added to water is ( )
(A) displacement reaction
(B) gas liberating reaction
(C) heat liberating reaction
(D) combustion reaction
Answer:
(C) heat liberating reaction