s-Block and p-Block Elements

Al₂F₂SiO₄ is named as:

Which of the following is pale yellow to reddish yellow in color?

_ is necessary for development of leaves and it tends to accumulate in leaves and bark.

_is colorless volatile liquid at room temperature.

CaO forms fertilize slag by reacting with:

Al₂O₃(SiO₂).2H₂ is called:

Which of the following does not react with water?

Which metal is commonly used to remove air bubbles from molten metals?

Which element has the largest number of allotropic forms?

Magnesium reacts with hydrogen at high pressure in the presence of catalyst _ forming magnesium hydride.

Sulphuric acid is used to manufacture:

Concentrated nitric acid gives_ when it reacts with tin.

Name the rare halogen among the following.

Which element forms long chains alternating with oxygen?

In many of its properties ____ is quite different from the other alkali metals.

_ is used as catalyst in Haber's process for NH₃ gas manufacture.

Which Noble Gas is used in bacterial lamps?

Phosphine can be produced by _ of phosphorous acid.

Formula of lead suboxide is:

Asbestos is hydrated _ magnesium silicate.

Which metal carbide is formed readily by the direct reaction?

At which condition are hydrides of alkaline earth metals formed:

Which metal occurs as skeletal material in egg shells?

Hydrogen loses an electron to form:

The yellowish colour of photochemical smog is due to the presence of:

Potassium fertilizers are especially useful for:

Micronutrients are required in quantity ranging from:

The whiteness of the recycled newspaper is improved by treating it with:

The coagulant used in raw water to precipitate suspended impurities is:

The calcium sulpho-aluminate is:

Urea is produced by the reaction of liquid ammonia with:

The noble gas which is used in radiotherapy of cancer is:

White lead has one of the following properties:

The trend in the densities of elements of Group III-A of the Periodic Table is

Which of the following sulphates is not soluble in water?

The presence of calcium is essential for the normal development of plants. An adequate supply of calcium appears to stimulate the development of which part of the plants?

Which of the following carbonates of alkali metals is not stable towards heat and is decomposed on heating to its oxide along with liberation of CO₂?

Peroxyacetyl nitrate is an irritant to human beings and it effects:

In the Haber's process for the manufacturing of ammonia, nitrogen is taken from:

The unpolluted natural rainwater is slightly acidic due to the reaction of rain water with:

In contact process, the catalyst used for the conversion of Sulphur dioxide to Sulphur trioxide is:

In silicon dioxide each silicon atom is tetrahedrally bonded to four oxygen atoms and each oxygen atom is bonded to two silicon atoms. The ratio of silicon to oxygen atoms is:

The diagram below is a plot of melting points of elements of second period against their atomic numbers. Lithium and fluorine are placed at the extreme ends of the plot, on the basis of melting points where will you place Carbon among the empty slots on the plot?

In the Haber process for manufacturing of ammonia, Nitrogen is taken from:

In modern Haber Process Plants, the temperature maintained during the process is:

In the Contact Process for manufacturing sulphuric acid, Sulphur trioxide (SO₃) is not absorbed in water because:

The acid rain water has pH:

Alkaline earth metal hydroxides decompose on heating. Which of the following reactions is a correct representation of this decomposition?

The increase in the concentration of oxidizing agents in smog like H₂O₂, HNO₃, PAN, and ozone in the air is called:

What will be the relation for the speed of electron accelerated towards the target in the X-ray tube by applying potential difference ‘V’, taking the mass of electron ‘m’ and charge on electron ‘e’?

The yellowish-brown color in photochemical smog is due to the presence of:

The catalyst used in the Haber’s process is:

Unpolluted rain water has a pH of:

Which one of the following pollutants can cause death of a person by binding withhaemoglobin of red blood cells?

_ is an eye irritant.

Which one of the following products is obtained when sulphur trioxide is absorbed inconcentrated sulphuric acid?

The pH of acid rain is:

Which one of the following is the correct chemical reaction for Ammonia formationby Haber process?

Which one of the following is the correct equation of 1st ionization of sulphuric acid?

The trends, in melting points of the elements of the 3rd period, are depicted in the figure below.The sharp decrease observed from ‘Si’ to ‘P’ is due to

Radon is _ emitter and being radioactive is used in _ treatment in radiotherapy.

The biggest source of acid rain is the oxide of:

What is the percentage of nitrogen in NH₄NO₃?

Urea is the most widely used nitrogen fertilizer in Pakistan. Its composition is:

About 80% of ammonia is used for the production of:

The synthesis of ammonia by Haber’s process is a reversible reaction. What should be done to increase the yield of ammonia in the following reaction?N_2(g) + 3H2_(g) ⇌ 2NH_3(g) H = -92 kJmol^-1

During the contact process of H₂SO₄ synthesis, the following reaction occurs: 2SO_2(g) + O_2(g) ⇌ 2SO_3(g) H = -96 kJmol^-1 Which step is used to increase the yield of SO₃?

Which one of the following is an anhydride of sulfuric acid?

The percentage of nitrogen in ammonium nitrate is:

The yellowish color of photochemical smog is due to the presence of:

The energy from ultraviolet light is sufficient to break the _ bonds in CCl₂F₂.

_is the major source of acid deposition in the atmosphere.

The balanced chemical equation to manufacture ammonia by Haber’s Process is:

SO₃ formed in the contact process is absorbed in _% H₂SO₄.

Liquid Ammonia has become an important fertilizer for direct application to soil. It contains _Nitrogen.

Nitrogen gas reacts under _ conditions.

Which noble gas is alpha emitter?

6NaOH + 3Cl₂ 5NaCl + NaClO₃+3H₂O

In the above disproportion reaction, the oxidation state of chlorine is changed from zero to _ and _.

The following sketch shows the melting point of eight elements with consecutive atomic numbers. Which element is Silicon?

The following graph shows a physical property along the period 3 elements. Which physical property is shown in the graph?

Which agent is responsible for acid rain:

Nitrogen is required by plants for the _:

In contact process, optimum temperature lies between _:

Among the following, which compound is a catalyst in contact process:

Which of the following would react with ozone in the atmosphere?

Which of the following gas, when ignited, burns with a blue flame and is not very soluble in water?

Down the group acid-base behaviour of metallic oxides of group 2 elements changes to:

The essential property of a fertilizer is that is should be:

Which of these pollutants is produced by burning of coal and causes acid rain:

In Period 2 and Period 3 maximum melting point shown by elements:

The catalyst used for the manufacture of H₂SO₄ by contact process is:

Free Nitrogen and Oxygen are present in atmosphere but they do not react with each other under normal conditions because:

In contact process, to which substance are adequate quantities of water added to convert it to sulphuric acid?

All alkali metals react with chlorine gas to form white metal chlorides salt. The metal chlorides salt formed is:

Which oxyacid of halogen is strong oxidizing agent?

Identify the CORRECT option required for the maximum yield of ammonia by Haber's Process:

Alkaline earth metal hydroxides decompose on heating. Which of the following reactions is a correct representation of this decomposition?

Which one of the following will have the smallest radius?

What is the nature of reaction Li₂O + H₂O → 2LiOH_(aq)?

Which of the following element has greater negative first electron affinity (EA₁)?

Which of the following chloride of 3rd period element is ionic in nature?

The acidic oxide among the following is:

Which of the following metal reacts with water to form hydroxide and H₂?

Which of the following has lowest boiling point?

Which reaction is practically not possible?

In reaction between alkaline earth metal oxide and water the base is

Solution of group IIA metal hydroxides are hydroxides

On moving down the group in metals, reactivity of metals

Which oxide of IIA dissociates into ions in water, most easily?

Sodium nitrate (NaNO₃​), on heating, decomposes forming:

Which of the following elements react rapidly with water at room temperature?

Third period element that initially reacts rapidly with oxygen to form a protective oxide coating that prevents further reactions is

Which of the following alkali metal forms only normal oxide with O₂?

Which of the following metal hydroxide is the strongest base?

Which of the following metal forms superoxide when reacted with oxygen?

The correct stability order of M⁺⁴ cations is

Metallic character of alkaline earth metals ------down the groups.

The difference of lithium from the other alkali metals is mainly because of:

The solubility of sulphates of alkaline earth metals generally

Which of the following is not basic in nature

Mostly p-block elements react with-----each other to form binary compounds:

Oil of Vitriol refers to:

The alkali metal that gives a yellow color during a flame test is:

Dry heating of calcium acetate gives which of the following?

The color of Mg metal flame is?

Which of the following hydroxide of group I is less soluble in water?

Select the group whose elements easily lose electrons.

Reactivity order of halogens is

Which of the following is not oxidized by any oxidizing agent?

Which of the following alkali metals can form normal oxide as well as peroxide?

Which of the following properties decreases in group 2 as we go down the group?

The molecules of iodine form the _.

All alkaline earth metals oxides are white in colour except _.

Which of the following sulfate compound is insoluble In water?

Which group of the periodic table contain non-metals, metalloids and metals

Why dimer of Aluminum chloride Is formed

Among LiCI, BeCl₂, NaCl, CsCI, the compounds with the greatest and the least ionic character respectively are:

Which of the following element has smaller size?

The ionization energy increases along a period in periodic table due to increase in:

Oxidation of K₂MnO₄ by Cl₂ is to manufacture:

Group IB is called the coinage metals. Which one is not true about this group?

The general electronic configuration of halide ions is:

Which of the following metals does not react with water?

Why is the first ionization energy of Beryllium higher than Boron?

Flame tests identify alkali metals when they are burnt, which of the combinations given is the correct one?

Which compound is formed when Magnesium is reacted with 2 molecules of water?

The melting point of NaCi is very high 801°,it is reduced to 600°C, it is by in Down's process

Strontium lies between calcium and barium in group lIA in the Periodic Table. Which of the following properties could be predicted for strontium?

Magnesium oxide is used in the making of the lining of the blast furnace.It is extracted from seawater as follows. Aqueous seawater is added to seawater. Ca(OH)_2(aq)+MgCl_{2 (aq)}Mg (OH)_2(s) + CaCl_{2 (aq).} The magnesium hydroxide is then filtered off and roasted. Which of the following comparisons between calcium and magnesium explains why magnesium hydroxide forms?

In the redox reaction of SO₂ with KMnO₄ for an acidic medium:

Oxygen can be prepared by the decomposition of potassium chlorate (KClO₃). How many moles of oxygen (O_2(g)) can be formed by taking 12 moles of potassium chlorate (KClO₃) according to the following equation?2KClO_3(l) + heat 2KCl_(s) + 3O_2(g)

All alkali metals react with chlorine gas to form white metal chloride salt. The metal chloride salt formed is:

The electronic configurations of some elements are given below. Recognize the element that belongs to group IIIA

Select the metal that is extracted from bauxite.

Which oxyacid of halogen is a strong oxidizing agent?

Why does fluorine have less electron affinity as compared to bromine?

Which element has smaller shielding effect among the following?

Among alkali metals which element reacts slowly with H₂O?

A metal reacts vigorously with cold water melting in to a ball of molten metal moves across the surface of water giving of Hydrogen gas and burns wni yellowish golden flame. What could be the identity of this metal?

Superoxide of Group I-A element (M) has the formula

Metallic property in a group of P-block element has a trend down the group:

Which of the following best describes the ionic reaction of inorganic compounds?

Ca (Z=20) forms an ionic bond with CI (Z=17). What is the chemical formula of calcium chloride?

The valence shell electronic configuration of an element is 4s² , 4p¹. To which group does the element belong?

Which of the following is different in Na⁺ (Z=11), Mg⁺² (Z=12) and AI⁺³ (Z=13)?

Which one of the following has the highest ionic character?

Alkali metals cannot make carbides except:

Which one is not a member of Alkali metals?

Those elements, with an electronic configuration of valence shell ns² np6 show little tendency to react chemically, are called?

Halogens are being used as fire extinguishers, mild antiseptic CFCs and many other organic chemicals, Which of the following halogen is used to kill the bacteria in drinking water.

Group 1 elements are called?

The halogen acid with the highest reducing power is:

Which alkaline earth metal form peroxides?

Which one of the following alkaline earth metal carbonates is thermally the most stable?

The flame colour of Ca in flame test is:

The carbonates of alkali metals are soluble in water except:

The ionization of Hydrogen atom gives:

Metals belonging to the same group in the periodic table are:

Pierrie Curie and Marie Curie isolated which radioactive element?

Magnesium oxide is used in:

Which of the following element is not present in halogens?

The chief ore of aluminium is: