11th Class Chemistry Quiz

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What is the purpose of adding excess sulfate solution in step 1 of preparing barium chloride?

To ensure all the barium ions react with the sulfate ions (correct)

To increase the concentration of barium chloride

To dissolve the precipitate formed

To neutralize the solution

Which of the following methods can be used to separate the precipitate from the reaction mixture?

Filtration (correct)

Decantation

Evaporation

Distillation

What is the chemical formula for the insoluble precipitate formed when barium nitrate solution is mixed with sulfate solution?

BaSO4 (correct)

BaCl2

Na2SO4

BaNO3

Which of the following properties is NOT characteristic of metals?

Non-conductivity of heat and electricity (C) Signup and view all the answers

Which of the following gases can be identified by its ability to rekindle a glowing splint?

Oxygen (A) Signup and view all the answers

What type of bond is formed in the compound silver chloride?

Ionic (D) Signup and view all the answers

Which of the following compounds is a soluble salt?

Lead(ll) nitrate (C) Signup and view all the answers

In the method for preparing an insoluble salt, why is it important to wash the precipitate with distilled water?

To dissolve any remaining soluble impurities (B) Signup and view all the answers

Which of the following is a suitable reagent for preparing a precipitate of lead(II) sulfate?

Sodium sulfate (A) Signup and view all the answers

When a lighted splint is extinguished with a pop sound, which gas is most likely present?

Hydrogen (C) Signup and view all the answers

Which of the following statements accurately describes the properties of metals?

Metals are generally malleable and ductile, and they are good conductors of heat and electricity. (B) Signup and view all the answers

In the preparation of barium chloride, why is the sulfate solution added in excess?

To ensure that all barium ions are reacted with sulfate ions. (B) Signup and view all the answers

Which of the following techniques is used to separate the precipitate from the reaction mixture?

Filtration (A) Signup and view all the answers

Why is it important to wash the precipitate with distilled water after filtration?

To remove soluble impurities and ensure a pure precipitate. (A) Signup and view all the answers

Which of the following best describes the type of bond present in silver chloride?

Ionic bond (C) Signup and view all the answers

In the method for preparing an insoluble salt, why is it important to stir the solution until no more precipitation forms?

To ensure that all the reactants have been consumed in the reaction. (B) Signup and view all the answers

Which of the following statements about the arrangement of electrons in atoms is incorrect?

Atoms have a fixed number of shells that cannot be changed. (B) Signup and view all the answers

Which of the following techniques is most suitable for separating a mixture of sand and iron filings?

Filtration (D) Signup and view all the answers

Which of the following statements accurately describes the process of fractional distillation?

It's used to separate liquids with similar boiling points by condensing the vapors at different temperatures. (B) Signup and view all the answers

What is the main difference between a compound and a mixture?

A compound is formed by chemical reaction, while a mixture is formed by physical mixing. (A), A compound has a fixed ratio of elements, while a mixture can have varying ratios. (B), A compound has different properties than its elements, while a mixture has the same properties as its components. (D) Signup and view all the answers

What is the significance of the octet rule in chemical bonding?

Atoms tend to gain or lose electrons to achieve a stable eight electrons in their valence shell. (A) Signup and view all the answers

Which of the following is not a characteristic of ionic compounds?

They conduct electricity in the solid state. (B) Signup and view all the answers

Which of the following statements accurately describes the properties of isotopes?

Isotopes have the same atomic number but different mass numbers. (C), Isotopes have the same chemical properties but different physical properties. (D) Signup and view all the answers

What is the role of the condenser in the fractional distillation process?

To collect the distillate as it condenses. (B) Signup and view all the answers

Which type of chemical bonding is formed by sharing electrons between atoms?

Covalent bonding (B) Signup and view all the answers

What is the main purpose of a fractionating column in fractional distillation?

To increase the surface area for vapor condensation, increasing the number of vaporization-condensation cycles, leading to a more effective separation of liquids with close boiling points. (D) Signup and view all the answers

Which of the following is not a property typically associated with metals?

Generally brittle and easily broken. (D) Signup and view all the answers

Which of the following is an example of a compound?

Sugar (A) Signup and view all the answers

What is the difference between a proton and a neutron?

Protons are positively charged and neutrons have no charge. (D) Signup and view all the answers

Which of the following is not true about the noble gases?

They readily form compounds with other elements. (A) Signup and view all the answers

What is the role of ice in the receiver during distillation?

To prevent the distillate from overheating. (D) Signup and view all the answers

What type of oxide can react with both acids and bases to form salts and water?

Amphoteric oxide (C) Signup and view all the answers

Which of the following salts is an example of a soluble salt?

Sodium carbonate (C) Signup and view all the answers

Which of the following statements about salts is incorrect?

All chlorides are soluble in water. (A) Signup and view all the answers

What happens to hydrated salts when they are heated?

They release water of crystallization. (D) Signup and view all the answers

What is a characteristic property of neutral oxides?

They do not show basic or acidic properties. (A) Signup and view all the answers

What is the primary purpose of using an excess amount of metal or base in the preparation of soluble salts?

To ensure complete neutralization of the acid. (A) Signup and view all the answers

Which of the following oxides is considered amphoteric?

Zinc oxide (D) Signup and view all the answers

During the reaction of acids with metals, what gas is produced?

Hydrogen (B) Signup and view all the answers

What distinguishes anhydrous salts from hydrated salts?

Anhydrous salts do not contain water of crystallization. (B) Signup and view all the answers

Which of the following is true about the solubility of salts?

All ammonium salts are soluble in water. (B) Signup and view all the answers

Which statement is true about basic oxides?

Most basic oxides are solid at room temperature (B) Signup and view all the answers

What do amphoteric oxides react with?

Both acids and bases (B) Signup and view all the answers

Which of the following is an example of a neutral oxide?

Water (D) Signup and view all the answers

What is formed when acids react with carbonates?

Salt, water, and carbon dioxide (B) Signup and view all the answers

What defines a hydrated salt?

It contains water of crystallization (A) Signup and view all the answers

Which salts are guaranteed to be soluble in water?

All sodium, potassium, and ammonium salts (D) Signup and view all the answers

Why is excess metal, base, or carbonate used in the preparation of soluble salts?

To ensure that all acid reacts completely (D) Signup and view all the answers

What is a characteristic property of insoluble salts?

They always precipitate in acid-base reactions (D) Signup and view all the answers

What is the primary method used to prepare insoluble salts?

Filtration of the excess reactant (A) Signup and view all the answers

Which of the following metals may pose a challenge in the preparation of salts due to their reactivity?

Potassium (A) Signup and view all the answers

Which of the following statements accurately describes isotopes?

Isotopes have the same chemical properties but different physical properties. (D) Signup and view all the answers

What type of ions do metals typically form during ionic bonding?

Cations (D) Signup and view all the answers

What factor contributes to the high melting and boiling points of most ionic compounds?

Strong electrostatic forces of attraction. (D) Signup and view all the answers

In chromatography, what is primarily being analyzed for separation?

Components that dissolve in the same solvent. (A) Signup and view all the answers

What distinguishes a compound from a mixture?

Compounds have different properties from their elements. (B) Signup and view all the answers

When performing a distillation, what does a constant temperature reading on the thermometer indicate?

The vapour has reached equilibrium. (B) Signup and view all the answers

What allows electrons to move freely in metallic bonding?

Presence of loosely held outer electrons. (D) Signup and view all the answers

What is true about the first shell of electrons in an atom?

It can hold a maximum of 2 electrons. (D) Signup and view all the answers

What is a characteristic feature of noble gases?

They exist as individual monatomic gases. (C) Signup and view all the answers

Which of the following describes how chemical reactions occur?

Electrons participate while neutrons do not. (A) Signup and view all the answers

How is the mass number of an atom calculated?

By adding the number of protons and neutrons. (B) Signup and view all the answers

What characteristic of mixtures differentiates them from compounds?

Mixtures can be separated by physical properties. (B) Signup and view all the answers

What typically occurs to the temperature during fractional distillation once a component has been distilled over?

Temperature rises to the next component's boiling point. (B) Signup and view all the answers

What is the first step in the preparation of an insoluble salt using barium nitrate and sulfate solution?

Pour barium nitrate solution into a beaker (A) Signup and view all the answers

Which of the following gases is identified by placing a lighted splint at the mouth of the test-tube?

Hydrogen (B) Signup and view all the answers

Which solution can be used to produce silver chloride as an insoluble salt?

Lead(II) nitrate and hydrochloric acid (D) Signup and view all the answers

What is the correct observation when oxygen is present in a test tube?

The glowing splint is rekindled (C) Signup and view all the answers

In the process of filtering a precipitate, what is the purpose of washing the precipitate with distilled water?

To remove any soluble impurities (D) Signup and view all the answers

What is the primary characteristic of the insoluble salt produced during the mixing of solutions?

It separates as a solid from the liquid mixture (C) Signup and view all the answers

Which of the following options describes a property that is typically associated with metals?

High malleability (C) Signup and view all the answers

What is the outcome when carbon dioxide gas bubbles through lime water?

A white precipitate forms and dissolves with further bubbling (A) Signup and view all the answers

What is formed when a basic oxide reacts with an acid?

Salt and water (C) Signup and view all the answers

Which type of oxide shows neither basic nor acidic properties?

Neutral oxide (C) Signup and view all the answers

What is the formula for the hydrated form of zinc sulfate?

ZnSO4 · 7H2O (D) Signup and view all the answers

Which of the following statements is true regarding the reaction of acids with carbonates?

Water and carbon dioxide are produced. (A) Signup and view all the answers

Which salts are classified as soluble in water?

All nitrates (C) Signup and view all the answers

What is the primary characteristic of amphoteric oxides?

They can react with both acids and bases. (C) Signup and view all the answers

What method is suitable for preparing salts that are insoluble in water?

Precipitation method (B) Signup and view all the answers

Which of the following oxides is known to be amphoteric?

Zinc oxide (C) Signup and view all the answers

Which of these metals would pose a challenge when preparing soluble salts due to its high reactivity?

Sodium (B) Signup and view all the answers

Which statement accurately describes a property of mixtures?

Components in mixtures retain their individual properties. (C) Signup and view all the answers

What distinguishes isotopes of an element?

They have different numbers of neutrons. (B) Signup and view all the answers

Which of the following accurately describes the boiling point behavior during fractional distillation?

The lowest boiling point liquid distills first. (C) Signup and view all the answers

What is the role of the protons in an atom?

They determine the mass number of the atom. (D) Signup and view all the answers

What is a characteristic property of ionic compounds?

They have strong electrostatic forces between ions. (A) Signup and view all the answers

How do metals typically form ions?

By losing outer electrons. (B) Signup and view all the answers

What describes the behavior of noble gases?

They are stable and unreactive as single atoms. (A) Signup and view all the answers

What is the main purpose of a chromatographic technique?

To separate components that dissolve in the same solvent. (B) Signup and view all the answers

Which process takes place when a compound is formed?

Chemical reaction that combines elements in a fixed ratio. (B) Signup and view all the answers

During a chemical reaction, which particles are primarily involved?

Electrons only. (A) Signup and view all the answers

What is the primary method of separating components in fractional distillation?

Boiling point differences. (B) Signup and view all the answers

How are electrons arranged in an atom?

They are evenly distributed in all shells. (B) Signup and view all the answers

In terms of energy change, how do mixtures and compounds differ?

Compounds result from chemical reactions. (D) Signup and view all the answers