1 |
In which group of periodic table is the element which has atomic number 14. |
II
IV
III
VI
|
2 |
Mark the incorrect statement |
Metallic character increase down the group
Metallic character increase from left to right along a period
Metallic character decrease from left to right along a period
Metallic character remains the same down the group
|
3 |
Electron affinity is measure of energy |
Required to remover the electron
Released by adding an electron
Required to excite an electron
Released by removing an electron
|
4 |
Ionization energy of calcium is. |
Lower than that of barium
Lower than that of magnesium
Higher than that of beryllium
Lower than that of strontium
|
5 |
Hydrogen resembles in properties with |
IA, IV A and VII A elements
III A, IV A and V A elements
II A, IV A and VI A elements
II A, III A and VII A elements
|
6 |
Which statement is incorrect. |
All the metals are good conductors of electricity
All the metals are good conductor of heat
All the metal form positive ions
All the metal form acidic oxides
|
7 |
Mark the correct statement. |
Na+ is smaller than Na atom
Na+ is large than Na atom
Cl- is smaller than Cl atom
cl- and Cl are equal in size
|
8 |
Keeping in view size of atoms ,which order is the correct one. |
Mg > Sr
Ba > Mg
Lu > Ce
Cl > I
|
9 |
Ecosystem is a smaller unit of |
lithospher
hydroshper
atmosphere
biosphere
|
10 |
Fungicides are the pesticides which |
Control the growth of fungus
Kill insects
Kill plants
Kill herbs
|
11 |
The avoid the formation of toxic compounds with chlorine which substance is used for disinfecting water |
KMnO<sub>4</sub>
O<sub>3</sub>
Alums
Chloramines
|
12 |
Peroxyacetylnitrate (PAN) is an irritant to human beings and it affects |
eyes
ears
stomach
nose
|
13 |
The pH range of the acid rain is |
7-6-5
6.6-6
6-5.6
less than 5
|
14 |
The news paper can be recycled again and again as many times as |
5
3
4
2
|
15 |
Water is disinfected by a substance to avoid toxification |
KMnO<sub>4</sub>
Alums
O<sub>3</sub>
Cl<sub>2</sub>
|
16 |
In water the concentration of dissolved O2should be |
1-3 ppm
2-4 ppm
4-8 ppm
8-12 ppm
|
17 |
The main pollutant of leather tanneries in the waste water is due to |
Lead
Chromium VI
Copper
Chromium III
|