1) Gram atomic mass is also considered as - gram ____(ion/molecule/atom)
2) Decomposition of ammonium chloride by heat to give ammonia and chlorine is an example of thermal to composition thermal dissociation catalytic reaction the valency of ___(thermal decomposition/ thermal dissociation/ catalytic reaction).
3) The valency of copper in CuCl₂ is ____(1⁺/2⁺/3⁺).
4) The law which relates between the pressure of a gas and the volume occupied by it, temperature remaining constant is _____(Charle's law/ Boyle's law/ Lussac's law).
5) The temperature ____ is called absolute zero. (273K/0°C/ - 273°C).
6) Oxygen in presence of U. V. light gives two ______. This combines with ___ to give ozone. (Oxygen atoms/ oxygen molecule/ two oxygen molecules)
7) Hydrogen and carbon monoxide are example of ____ gases while chlorine and oxygen examples of ____gases. (non-combustible/ combustible )
8) An increase in pressure on the surface of water causes ____ in the solubility of the gas dissolved in water. (increase/decrease/ no change)
9) ____ is an example of an efflorescent salt, while ____an example of a deliquescent salt. (Lead chloride/ washing soda / iron[III] chloride)
10) If an element 'X' has atomic number 18, then valency is____ ( + 1/ - 1/0)
11) The maximum number of electrons in any shell of an atom is represented by 2n². The maximum number of electrons in the M shell is ____(2/32/18/8)
12) Isotopes of chlorine have the same _____but different number of____( atomic number/mass number/ neutrons /protons/electrons )
13) An element 'Y' has atomic number 20. It finds position in period ____(2/3/4) and group ____(1/2/3).
14) The basis of classification of elements by Newlands was based on arrangement of elements in increasing order of ____(atomic number/atomic weights ) in series of ____(6/7/8).
15) The period-1 contains _____elements, and period 2 and 3 ___elements each. There are ____horizontal rows called periods, and _____vertical columns called groups. An element in period 3 will have _____electron shell or orbits and in group VA will have ____ valence electrons in its outermost shell. (2/3/5/7/8/10/18)
16) Period 2 is a ____(short/ long) period containing____( 6/7/8) elements of which, carbon (at. no.6) is placed in group ____(14[IVA]/15[VA]/16[VIA],p), nitrogen (at. no. 7) is placed in group ____(14/15/16), oxygen(at. no. 8) is placed in group___ (14/ 15 /16/17), sulphur (at. no.16) is placed in group ____(14/ 15/ 16/ 17) and chlorine (at. no. 17) is placed in group ___(14 /15 /16/ 17).
17) On moving from left to right in a period, the number of electron shells ___(remain same/increase by one), the number of valence electrons___( remain same/ increase by one) and the elements show a transition from ____(non metallic to metallic/ metallic to non metallic) character. On moving down a group, the valence electrons ___(remains same/increase by one) and the elements show a transition from ____(non metallic to metallic/metallic to non metallic) character.
18) A non renewable source of energy fuel used instead of fossil fuel to reduce greenhouse gas pollution is ____(hydrogen energy/ biogas/ CNG)
19) From the elements of group 15[VA] ___&___ are nonmetals and highly electronegative. The electronegativity---- on moving down the group and so also the non metallic character. ( nitrogen/ Phosphorus/ arsenic /antimony/increase/decreases)
20) Hydrogen gas is lighter than air in collected in the laboratory by ____(upward displacement of air/downward displacement of water/downward displacement of air)
21) Sulphur dioxide gas turns potassium permanganate solution from___ to colourless and potassium dichromate from ____ to ____(orange /green/ pink/ blue)
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