Chemistry

If an element $X$ belongs to Group 1 and Period 3, its atomic number is:

The most metallic element in Period 2 is:

Which halogen is a liquid at room temperature?

The horizontal rows in the periodic table are 7 in number. What is the name for the 6th period?

A cation is always smaller than its parent atom because:

What happens to the chemical reactivity of alkali metals as you move down the group?

In the modern periodic table, bridge elements are found in:

Which of the following statements about the Screening Effect is correct?

The metallic character _________ down the group and _________ across the period.

If the electronegativity of an atom is very high, it is likely to be a:

Atoms combine with each other to:

What is the total number of electrons shared in a molecule of Oxygen ($O_{2}$)?

Which of the following is a characteristic of ionic compounds?

In the Ammonia molecule ($NH_{3}$), the Nitrogen atom has:

The following flowchart represents the dissociation of a water molecule ($H_{2}O$) into two distinct ions. Based on the concept of electron transfer during bond cleavage, how many lone pairs of electrons are present on the Oxygen atom in the resulting Hydroxyl ion ($OH^{-}$)?

An example of a molecule containing a double covalent bond is:

The solubility of ionic compounds in water is due to:

Why is the bond in $HF$ stronger and more polar than the bond in $HI$?

When Calcium (At. No. 20) combines with Fluorine (At. No. 9), the resulting compound is $CaF_{2}$. Which statement correctly describes the electronic change?

Which of the following statements about the Hydronium ion ($H_{3}O^{+}$) is FALSE?

Identify the pH value of a solution that turns phenolphthalein pink.

Which substance is used as a drying agent in the laboratory for drying $HCl$ gas?

The salt formed by the partial replacement of the replaceable hydrogen atoms of an acid is called:

Which of the following acids is a weak mineral acid?

What is the value of the ionic product of water ($K_{w}$) at $25^{\circ}C$?

Which of the following bases is not an alkali because it is insoluble in water?

When Calcium carbonate is heated strongly, what are the products formed?

Silicon dioxide ($SiO_2$) does not contain any Hydrogen atoms, yet it is classified as an acidic oxide. This is because:

According to Henry's Law, what happens to the solubility of a gas like $HCl$ in water when the pressure is increased at a constant temperature?

Calcium phosphate ($Ca_3(PO_4)_2$) is an example of which type of salt?

Sodium hydroxide is often called:

A student test a salt solution with sodium hydroxide and gets a white precipitate. On adding excess sodium hydroxide, the precipitate dissolves. The salt solution could contain:

Which of the following ions forms a reddish-brown precipitate with sodium hydroxide?

The action of alkalis on certain metals like $Zn$ and $Al$ results in the production of a salt and:

What is the color of the precipitate formed by $FeSO_{4}$ with sodium hydroxide?

Which of the following statements about $ZnO$ is correct?

Identify the cation that gives a pale blue precipitate with $NH_{4}OH$ which dissolves in excess to give a deep blue solution:

Which property is common to the hydroxides of Aluminum, Zinc, and Lead?

The solubility of $Pb(OH)_{2}$ in excess $NaOH$ is due to its:

What is the product formed when aluminum hydroxide reacts with excess sodium hydroxide?

Which of the following contains the Avogadro number of particles?

The Relative Molecular Mass of Carbon Dioxide ($CO_2$) is: (Atomic masses: $C=12, O=16$)

Which of the following is the correct formula for percentage of an element in a compound?

How many molecules are in $22.4 L$ of Oxygen gas at STP?

If 10 volumes of Methane burn in Oxygen, what volume of $CO_2$ is produced? Equation: $CH_4 + 2O_2 \rightarrow CO_2 + 2H_2O$

Calculate the Relative Molecular Mass of Phosphoric acid ($H_3PO_4$). (Atomic masses: $H=1, P=31, O=16$)

How many moles of atoms are contained in 180 g of water ($H_2O$)?

A compound has an empirical formula $CH_2$ and Vapour Density 21. Its molecular formula is:

100 $cm^3$ of Ethane ($C_2H_6$) is mixed with 400 $cm^3$ of Oxygen and ignited. What is the volume of unused Oxygen? $2C_2H_6 + 7O_2 \rightarrow 4CO_2 + 6H_2O$

What mass of Nitrogen is required to produce 34 g of Ammonia? $N_2 + 3H_2 \rightarrow 2NH_3$

Identify the component of an electrolytic cell from the diagram logic provided:

Which of the following statements about electrodes is CORRECT?

What is the charge on a cation?

When glucose is dissolved in water, it does not conduct electricity. Glucose is therefore a:

In the electrolysis of molten $NaCl$, the product formed at the anode is:

A substance which does not conduct electricity in the solid, molten, or aqueous state is called a:

Which of the following statements about the electrolysis of copper sulphate using platinum electrodes is FALSE?

What happens to the number of molecules of the electrolyte in a solution of a weak electrolyte upon increasing the concentration?

When electrolyzing molten Potassium Hydroxide ($KOH$), the product formed at the anode is:

Which of the following is a characteristic of 'Anode Mud' in the electrolytic refining of Copper?

During the electrolysis of Alumina, the gas liberated at the graphite anodes is:

In the Hall-Heroult cell, the electrolyte consists of molten Alumina dissolved in:

The bond formed between a metal and oxygen in a typical metal oxide is usually:

The major constituent metal in the alloy Duralumin is:

Aluminium reacts with dilute Hydrochloric acid to produce:

During the Hall-Heroult process, the electrolyte is covered with a layer of powdered coke. This is done to:

Which of the following is the correct order of reactivity (highest to lowest) for the given metals?

During the extraction of Aluminium, why is the process called 'Electrolytic Reduction'?

Which of the following correctly matches the ore with its concentration method?

In the Hall-Héroult process, what is the approximate voltage maintained across the electrolytic cell?

Nessler's reagent is used to detect very small amounts of Ammonia. What is the color of the precipitate formed?

Which gas is evolved when dilute Nitric acid reacts with Copper metal?

Hydrochloric acid is prepared by dissolving $HCl$ gas in water using a special funnel arrangement. Why is this arrangement used?

What happens when Ammonia gas is passed over heated Copper(II) oxide?

What is the product formed when Ammonia gas reacts with Hydrogen chloride gas?

Which acid is known as the 'Oil of Vitriol'?

Which of the following observations is true when Ammonium hydroxide is added to a solution of Zinc sulphate?

Sulphuric acid acts as a dehydrating agent when reacting with Copper Sulphate crystals ($CuSO_4 \cdot 5H_2O$). What is the color change observed?

Ammonia is a good reducing agent. This is shown by its reaction with heated Lead(II) oxide ($PbO$). The products of this reaction are:

In the laboratory preparation of Nitric acid, if the temperature exceeds $200^{\circ}C$, the glass apparatus may break. Another disadvantage of this high temperature is:

Which organic acid is the main constituent of vinegar?

What is the physical state of Methane at room temperature?

The common name for Methanal is:

What is the IUPAC name for Formic acid?

What is the valency of carbon in all organic compounds?

Which gas is produced when calcium carbide reacts with water?

Denatured alcohol is ethanol mixed with a small amount of which poisonous substance to make it unfit for drinking?

Which compound is formed when methane reacts with limited supply of oxygen (incomplete combustion)?

During the laboratory preparation of ethene, why is the gas collected by the downward displacement of water?

What is the IUPAC name for $CH_{3}-CH(OH)-CH_{2}-CH_{3}$?