CH-1 CHEMISTRY 10th Flashcards by Hammad Bin Tufail

why do we clear MG Ribbon with sandpaper before oxidizing it?

to remove the oxide layer that has formed
due to atmospheric oxygen.

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2Pb(NO3)2 + 2kI = ?

Pbi2 (s) + 2KNO3 (aq)

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what is law of constant prop.?

the elements in a chemical compound are always present in a fixed ratio by mass

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What is law of reciprocal proportions?

when two different elements combine independently with a fixed mass of a third element, the ratio of their masses is either the same or a simple multiple of the ratio they mix.

This law was discovered in the late 18th century by German chemist Jeremias Richter.

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Which of the following gas undergo diffusion most readily?
(a) LPG
(b) Carbon dioxide
(c) Hydrogen
(d) Nitrogen

c) hydrogen
in compounds it depends on intermolecular
attraction, but here it is just mass

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fluorescent lamps indicate which state of matter.
(a) Gas
(b) Liquid
(c) BEC
(d)Plasma

D) PLASMA

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Tincture of iodine is a solution of iodine in (a)Water
(b)Acetone
(c)Benzene
(d)Ethyl alcohol

D) ETHYL ALCOHOL
The alcohol mostly used in its preparation is Ethanol ( C 2 H 5 OH ).

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Which of the following is the smallest part of a compound whose properties are the same as those of a compound?
(a)Atom
(b)Molecule
(c)Mixture
(d)Unit cell

(b)Molecule

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The particles of a true solution are
(a)> 1 nm in diameter
(b)< 1 nm in diameter
(c) = 1 nm in diameter
(d) > or = 1 nm in diameter

(b)< 1 nm in diameter

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What is berzileus law of gases?

states that equal volumes of all gases contain equal numbers of atoms under similar conditions of temperature and pressure(later discarded)

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What is Avogadro’s law of gases?

equal volume of gases under same temp. and pressure have same number of molecules(moles)

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What is the ideal gas equation?

P v = n R T
P = pressure
v = volume
n = no. of moles
R = constant = 8.31
T = temperature

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Volume of any gas given by avogadro?

22.4 litre

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What is the Avogadro number?

6.022 . 10^23

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Atomic number of Titanium is
(a) 21
(b) 22
(c) 23
(d) 26

(b) 22

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Define Redox Reaction.

A Reaction in which oxidization and reduction takes place, simultaneously

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What is precipitation Reaction. give Example.

AgNO 3 ( aq ) Silver nitrate + KCl ( aq ) Potassium chloride → AgCl ( s ) ( ↓ )
( white ppt ) Silver chloride + KNO 3 ( aq ) Potassium nitrate.

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Formula of Aluminum sulphate is
(a) Al2(SO4)3
(b) AlSO4
(c) Al3(SO4)
(d) AlSO3

(a) Al2(SO4)3

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Photosynthesis is
(a) Exothermic
(b) Endothermic
(c) both
(d) None.

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(b) Endothermic

Valency of calciumis
(a) 2
(b)1
(c) 8
(d) 3

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(a) 2

Write the formula of the compounds (a)Barium Hydroxide
(b)Aluminum carbonate
(c)Sodium sulphate
(d)Magnesium phosphate
(e)Lithium hydroxide

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a) Barium Hydroxide: Ba(OH)₂
b) Aluminum Carbonate: Al₂(CO₃)₃
c) Sodium Sulfate: Na₂SO₄
d) Magnesium Phosphate: Mg₃(PO₄)₂
e) Lithium Hydroxide: LiOH

What is thermal decomposition with example

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a chemical reaction that occurs when heat is applied to a single reactant compound, causing it to break down into two or more products

Na →Na++ e-is example of
(a)Reduction
(b)Oxidation
(c)Redox Reaction
(d)All

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(b)Oxidation

Gain of hydrogen is called
(a)Reduction
(b)Oxidation
(c)combustion
(d)None

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(a)Reduction

What is redox reaction example its application?

Redox reactions are used in the electroplating process to apply a thin layer of a substance to an item

Why potassium and sodium kept in kerosene?

they are kept in kerosene oil to prevent it from coming in contact with oxygen and moisture as they react to form their hydroxides.

What happens when Silver nitrate reacts with sulphuric acid write balanced chemical equation.

2AgNO3 + H2SO4 = Ag2SO4 + 2 HNO3

Oxidation number of br2 is (a)2 (b)1 (c)O (d)-6

(c)O

Oxidation number of P in H3PO4 (a)+3 (b)+1 (c)+2 (d)None

D) none / +5

Give an example of a decomposition reaction. Describe an activity to illustrate such a reaction by heating .

when calcium oxide(quick lime) is reacted with water, heat calcium hydroxide(slaked lime)- CaO(s) + H20(aq) => Ca(OH)2 + Heat

What is an oxidation reaction?

When a substance reacts with oxygen and forms oxide of that substance , gain of electrons,etc

Why are decomposition reactions called the opposite of combination reactions? Explain with equations of these reactions.

decomposition reaction is in which 1 substance breaks down into 2 or more simpler substances. Ex- CaCO3(s) → CaO(s) + CO2(g) Combination is opposite of that. Ex- CaO(s) + CO2(g) → CaCO3(s)

Give one example of an exothermic reaction and one of an endothermic reaction

Ex. of exothermic reaction is white washing, etc. Ex. of endothermic reaction is respiration, etc.

Explain the term “rancidity”. What damage is caused by rancidity?

The condition produced by aerial oxidation of fats and oils in foods marked by unpleasant smell and taste is called rancidity. It spoils the food materials prepared in fats and oils which have been kept for a considerable time and makes them unfit for eating.

What is the color of zinc sulphate in laboratory? (a)Green . (b)Yellow . (c)Blue . (d)Colorless .

(d)Colorless .

KBr+BaI2→KI+BaBr2 What type of reaction is this? (a) Displacement reaction (b) Substitution Displacement (c) Combustion reaction (d) Double Displacement

(d) Double Displacement

A white precipitate can be obtained by adding sulphuric acid to: (a) CuSO4 solution (b) NaCl solution (c)BaCl2 solution (d) Na2SO4 solution

(c) . When dilute sulphuric acid reacts with barium chloride, barium sulfate is produced along with HCl gas. The resulting barium sulfate is a white, insoluble precipitate.

Which of the following are combination reactions? i, 2KClO3→2KCl+3O2 ii. MgO+H2O→Mg(OH)2 iii. 4Al+3O2→2Al2O3 iv. Zn+ FeSO4→ZnSO4+Fe (a) (i) and (iii) (b) (iii) and (iv) (c) (ii) and (iv) (d) (ii) and (iii)

(d) (ii) and (iii)

Dissolving sugar is an example of-(a)Physical change (b)Chemical change (c)Redox Reaction (d) None of these.

(a)Physical change Sugar dissolving in water is a physical change. The sugar can be obtained back by evaporation of water and the water by condensation of water vapour

Iron gets rusted due to formation of:(a)Fe2O3.H2O (b)Fe2O (c) Fe3O4 (d)FeO

(a)Fe2O3.H2O

Balance the following chemical equations: i. NH3−−−→N2+H2 ii. C + CO2−−−→CO

i. 2NH3 --- N2 + 2H2 ii. C + CO2−−−2CO

What is the difference between displacement and doubled is placement reactions? Write equations for these reactions.

Displacement reaction: Displacement reaction is a chemical reaction in which a more reactive element displaces a less reactive element from its compound. Ex- Zn + 2HCl --- ZnCl2 + H2 Double displacement reaction: A type of chemical reaction where two compounds react, and the positive ions (cation) and the negative ions (anion) of the two reactants switch places, forming two new compounds or products is called double displacement reactions. Ex- MgCl2 + 2kOH --- Mg(OH)2 + 2KCl

What happens when silver nitrate solution is added to sodium chloride solution? a) Write the equation for the reaction which takes place. b) Name the type of reaction involved.

When silver nitrate solution is added to sodium chloride solution, then a white precipitate of silver chloride is formed along with sodium nitrate solution. AgNO3(aq) +HCL(aq) --- AgCl(s) + HNO3(aq)

Which of the following is the false option for Chemical reaction? (a)Change in color. (b)Change in state. (c)Change in smell. (d)None of these

(d)None of these

Identify the name of the reaction. CO2+H2O→C6H12O6+O2+H2O (a)Respiration (b)Catenation (c)Photosynthesis (d)Combustion

(c)Photosynthesis

What type of reaction is the equation C+O2→CO2? (a)Synthesis (b)Decomposition (c)Single Replacement (d)Double Replacement

(a)Synthesis . This is because a synthesis reaction is when two or more reactants combine/react together to form a single product.

What happens when a piece of zinc metal is added to copper sulphate solution? (a)Decomposition reaction. (b)Displacement reaction. (c)Double displacement reaction. (d)Precipitation reaction.

(b)Displacement reaction.

CH-1 CHEMISTRY 10th Flashcards

(47 cards)