SS2 Live Exam Chemistry

Question 1 : The most important uses of hydrogen in the

Question 2 : In which of the following compounds is the oxidation number of nitrogen equal + 4?

Question 3 : Amphoteric oxides are oxides which

Question 4 : The following acids are monobasic except

Question 5 : When an atom gains an electron, it becomes

Question 6 : A solution of PH 7 is

Question 7 : An atom with 17protons, 17electrons and 18 neutrons has a mass number of

Question 8 : The valence electrons of the element 12Mg are in the

Question 9 : Dehydration of ethanol produces

Question 10 : Calcium atom ionizes by

Question 11 : Which of the following on burning in air, contributes to acid rain?

Question 12 : All except one metal, can displace hydrogen from water or acids

Question 13 : An isotope of hydrogen commonly referred to as heavy water

Question 14 : Which one is an amphoteric oxide?

Question 15 : Extraction of sulphur from the earth’s crust is by one of these processes

Question 16 : Sulphur (iv) oxide bleaches by

Question 17 : The atomic number of chlorine is 17. What is the number of electrons in a chloride ion?

Question 18 : What is the expression for the equilibrium constant (kc) for the following reaction? N2(g)+O2(g) 2NO(g)

Question 19 : A hydrogen atom which has lost an electron contains

Question 20 : The electronic configuration of an element is 1S2 2S2 2P2 3S2 3P3. Where is the element located in the periodic table?

Question 21 : When sodium atom forms the ion Na+,

Question 22 : What is the percentage composition of oxygen in K2 Cr2 O7? [K2 Cr207]=298, 0=16, K=39, Cr=52]

Question 23 : Which of these metals will not liberate hydrogen from dilute HCL?

Question 24 : Consider the following elements and their electronic configurations W: 1S2 2S2 X: 1S2 2S2 2P6 Y: 1S2 2S2 2P6 3S2 Z: 1S2 2S2 2P6 3S2 2P2

Question 25 : Diamond does not conduct electricity because it

Question 26 : What is the atomic number of an element whose cation y+ has the electronic configuration? 1S2 2S2 2P6?

Question 27 : The colour of phenolphthalein indicator in dilute HNO3(ag) is

Question 28 : A mixture of kerosene and diesel oil can be separated by

Question 29 : What is the value of -140c on the Kelvin temperature scale?

Question 30 : The separation of petroleum fractions depends on the differences in their

Question 31 : Which of the following elements is a d-block element?

Question 32 : The minimum amout of energy required for effective collisions between reacting particles is known as

Question 33 : Which of the following oxides is basic?

Question 34 : Consider the reaction representd by the following equation xKMnO4(ag) + ySo2(g) + zH2O(L) k2SO4(ag) + 2MnSo4(ag)+ 2H2SO4(ag) . x,y and z are respectively

Question 35 : Which of the following ions has the electronic configuration 2, 8, 8,?

Question 36 : The shape of a graphite crystals is

Question 37 : Ammonia reacts with excess chlorine to produced

Question 38 : What is the basicity of the acid in the following reaction? Na2CO3(ag) + 2CH3 COOH(ag) 2CH3COONa(ag) +H2O(L)+CO2(g)

Question 39 : Substances which absorb water from the atmosphere without dissolving in it are said to be

Question 40 : Which of the allotropes of sulphur has amber colour with needle shape