Important Questions Term 1 2022

Question 1

Electrolyte used in electroplating an article with silver

Answer 1

Sodium argento cyanide or Potassium argento cyanide

Question 2

The process by which polar covalent compounds are converted into ions in water

Answer 2

Ionisation

Question 3

Separation of ions which are already present in an Ionic compound, in water

Answer 3

Dissociation

Question 4

Aim of fountain experiment

Answer 4

To show high solubility of either HCl or Ammonia gas in water

Question 5

Condition for catalytic oxidation of ammonia to NO2

Answer 5

Pt is catalyst, 800 ‘C

Question 6

Drying agent for HCl gas

Answer 6

Conc. Sulphuric acid

Question 7

Collection of HCl gas

Answer 7

Downward displacement of air

Question 8

Advantages of funnel arrangement in preparation of Hydrochloric acid

Answer 8

1) prevents or minimizes back-suction of water
2) provides large surface are for absorption of HCl gas

Question 9

Drying agent used for ammonia gas

Answer 9

Quicklime (CaO)

Question 10

Process by which Ammonia is manufactured

Answer 10

Haber’s process

Question 11

Favourable conditions for Haber’s process

Answer 11

T 450-500’C
P above 200 atm
Catalyst finely divided Iron
Promoter Molybdenum

Question 12

The volume of 1 mole of a gas at STP

Answer 12

22.4 L or 22400 cm3

Question 13

Main ore of alumninium and its formula

Answer 13

Bauxite, Al2O3.2H2O

Question 14

define ore

Answer 14

The minerals from which metals are extracted commercially at a comparatively lower cost and minimum effort

Question 15

Process by which purification of bauxite ore is done ( bauxite converted to alumina)

Answer 15

Baeyer’s process

Question 16

The gas produced when dil HCl reacts with FeS

Answer 16

Hydrogen sulphide

Question 17

Aquaregia is a mixture of

Answer 17

3 parts HCl and 1 part HNO3

Question 18

Aquaregia yields nascent _____ atom

Answer 18

Chlorine

Question 19

Name of the liquid obtained along with HCl when excess chlorine reacts with ammonia

Answer 19

Nitrogen trichloride

Question 20

Helium atomic mass is 4 amu. 1 g atom of Helium is equal to ___ grams of Helium

Answer 20

4

Question 21

Cation is always _____ than parent atom (atomic size)

Answer 21

smaller

Question 22

Anion is always _____ than parent atom (atomic size)

Answer 22

larger

Question 23

Identify polar covalent compounds in following list
H2, N2, NH3, Cl2, CCl4,HCl, CH4, H2O

Answer 23

NH3, HCl, H2O

Question 24

A yellow monoxide that dissolves in hot and conc. caustic alkali

Answer 24

PbO

Question 25

A metal which produces hydrogen on reacting with alkali as well with as acid

Answer 25

Zn/Al/Pb

Question 26

STP condtions

Answer 26

T =273 K or O°C
P = 1 atm./760 mmHg/ 76 cmHg

Question 27

State Avagadro’s law

Answer 27

Equal volumes of all gases under similar conditions of T and P contain the same number of molecules

Question 28

Avagadro’s number

Answer 28

6.022 × 10 to the power 23

Question 29

The relative molecular mass of of a gas is twice its

Answer 29

vapour density

Question 30

In electrolysis of aq. CuSO4, the blue colour of electrolyte remains unchanged if we use _____ electrode as anode.

Answer 30

Copper

Question 31

In electrolysis of aq. CuSO4, the blue colour of electrolyte fades away if we use _____ electrode as anode.

Answer 31

Platinum

Question 32

conc.HCl with MnO2 yields ______ gas

Answer 32

Chlorine gas which turns moist starch iodide paper blue-black

Question 33

Catalytic poisons in Haber’s process

Answer 33

CO, CO2, sulphur compounds like H2S