Science M.C.Q. [I MARKS]

​Explanation:
Sulphur is a nonmetal. It cannot be drawn into wires or changed into sheets. It is very soft and hence, is brittle in nature.

Explanation:
Silver is less reactive than zinc, copper and magnesium. It is below all these metals in the reactivity series of metals.

Explanation:
Silver is least reactive will not produce hydrogen gas with sulphuric acid.

Explanation:
Copper cannot displace iron from iron sulphate solution because copper is less reactive than iron.

Explanation:
Copper corrodes by oxidation in which it reacts with oxygen in the air to form copper oxide. Copper oxide then combines with carbon dioxide to make copper carbonate, which gives it a green colour. This process is called corrosion of copper.

Explanation:
Carbon is a nonmetal. Nonmetals form oxides which are acidic in nature. Oxide of carbon is acidic.

Explanation:
Carbon is a nonmetal. Nonmetals form oxides which are acidic in nature. Oxide of carbon is acidic and hence, its aqueous solution will turn blue litmus to red.

Explanation:
Potassium is a metal. Metallic oxides are basic in nature.

Explanation:-
Potassium reacts with water to potassium hydroxide and hydrogen gas. The reaction potassium with water is highly exothermic in nature. It produces a lot of heat energy and this heat energy can cause the hydrogen gas produced during the reaction, to catch fire. In order to keep it safe potassium is stored in kerosene.

Explanation:
Zinc sulphate solution and calcium cannot undergo displacement reaction.
This is because zinc is more reactive than iron. Hence, iron cannot displace zinc from zinc sulphate solution.

Explanation:
Silver is least reactive and is placed below all these metals in reactivity series of metals.

Explanation:
The property of metals which allows metals to be hammered into thin sheets is called Malleability. Due this unique property, metals can be flattened into thin sheets by hammering and rolling.

Explanation:
Zinc is metal and it can be beaten into thin sheets. The property of metals which allows metals to be hammered into thin sheets is called Malleability.

Explanation:
Calcium is the most reactive metal than copper, iron and magnesium. It lies above all of these metals in reactivity series.

Explanation:
Phenolphthalein is an indicator used in acid-base titrations. It turns colorless in acidic solutions and pink in basic solutions. Sodium is a metal which reacts with water to form sodium hydroxide, which is a base. Hence, phenolphthalein turns the solution pink.

Explanation:
Silicon is a metalloid. The elements whose properties are intermediate between the properties of metals and nonmetals are called Metalloids.

Explanation:
Mercury is used for making thermometers. It is liquid at room temperature and is a very good conductor of heat.

Explanation:
Bromine is the nonmetal which is a red-brown liquid at room temperature. It evaporates readily to form a similarly coloured gas.

Explanation:
Metals react with oxygen to form metallic oxides. These metallic oxides are basic because they react with water to form bases. Sodium is a metal; its oxide will be basic in nature and it will turn red litmus solution to blue.

Explanation:
Sodium is stored in kerosene because it is highly reactive and it even reacts with moisture from air and catches fire.

Explanation:
Brittleness is not a characteristic property of Iron because it is a metal. Malleability, ductility, and sonorousness are the properties of metals.