Questions

Questions

Multiple Choice

When the positive charge on an ion increases or the negative charge on them decreases it is called as _____.

• reduction

• corrosion

• oxidation

• decomposition

Multiple Choice

_____ is an alloy made from iron, nickel and chromium.

• brass

• bronze

• stainless steel

• amalgam

Multiple Choice

The chemical reaction in which two or more products are formed from a single reactant is called _____ reaction.

• decomposition

• combination

• displacement

• double displacement

Multiple Choice

Aqueous solution of ZnSO₄ is added into the aqueous solution of BaCl₂, this is the example of _____. reaction.

• displacement

• double displacement

• redox

• reduction

Multiple Choice

Which of the following method is used to prevent the accumulation of greenish layer on brass due to corrosion

• electroplating

• anodization

• tinning

• alloying

Multiple Choice

In Modern Periodic Table the number of columns and periods are respectively _____ and _____.

• 16, 7

• 6, 16

• 18, 7

• 18, 6

Multiple Choice

Which one of the following statement about the factors affecting the rate of a chemical reaction is incorrect?

• Nature or reactivity of reactants influences the rate of a chemical reaction

• The rate of a reaction is proportional to the concentration of reactants

• Smaller the size of the reactant particles, higher is the rate of the reaction

• Rate of a reaction is inversely proportional to the concentration of reactants

Multiple Choice

In Wilfley table method to separate particles of gangue _____ method is used.

• Magnetic

• Froth floatation

• Leaching

• gravitation

Multiple Choice

Which one of the following option is incorrect?

• s-block - groups 1 and 2

• p-block - groups 13 to 18

• d-block - groups 3 to 12

• f-block - transition elements

Multiple Choice

Atomic number of aluminium is _____ and its electronic configuration is _____.

• 13, (2, 8, 3)

• 12 (2, 8, 2)

• 13, (3, 10)

• 12, (2, 10)

Multiple Choice

_____ is the outermost shell for elements of period 2.

• K

• L

• M

• N

Multiple Choice

The chemical formula of zinc blende is _____.

• ZnSO4

• ZnS

• ZnCO3

• ZnO

Multiple Choice

Which pair of atomic numbers represents elements in the same group?

• 11, 19

• 6, 12

• 4, 16

• 8, 17

Multiple Choice

Extraction of moderately reactive elements is done by _____ and _____ method.

• roasting and calcination

• roasting and reduction

• separation and calcination

• none of these

Multiple Choice

Which among the following elements would lose an electron easily?

• Mg

• Na

• Al

• Cl

Multiple Choice

Corrosion of silver causes a black layer of _____.

• Silver nitrate

• Silver oxide

• Silver sulphide

• Silver carbonate

Multiple Choice

Which among the following is the largest element?

• Na

• Mg

• K

• Ca

Multiple Choice

In preparation of Aqua regia hydrochloric acid and _____ acid are mixed.

• sulphuric acid

• nitric acid

• carbonic acid

• phosphoric acid

Multiple Choice

Which one of the following does not increase while moving down the group of the Modern periodic table?

• Atomic radius

• Metallic character

• Valency

• Number of shells

Multiple Choice

In the reaction given  $CuO+H_2\ \longrightarrow\ Cu+H_2O$  . Copper oxide is _____ and hydrogen is
                          .             

• Oxidized, reduced

• Reduced, oxidized

• Unaffected, reduced  

• Unaffected, oxidized

Multiple Choice

The d-block elements are called as _____ elements

• Transition

• Metalloid

• Normal

• Inner transition

Multiple Choice

_____ is the least reactive metal.

• silver

• sodium

• zinc

• gold

Multiple Choice

_____ is the distance between the nucleus of the atom and its outermost shell.

• Atomic radius

• Atomic diameter

• atomic mass

• atomic size

Multiple Choice

_____ is in liquid form in the halogen family.

• Fluorine

• Chlorine

• Bromine

• Iodine

Multiple Choice

The below mentioned details are the periodic trends in the modern periodic table across a period. Which one of the following is incorrect?

• decreasing atomic radius

• increasing electronegativity

• decreasing electropositivity

• decreasing non-metallic character and increasing metallic character