1 D and F Block Elements
The solubility of silver bromide in hypo solution is due to the formation of
1) [Ag(S2O3)] -
2) [Ag(S2O3)2] -3
3) Ag2S2O
4) Ag2SO3
Solution
The solubility of silver bromide in hyposolution due to the formation of [Ag(S2O3)2]3-
2 Chemical Equilibrium
The standard free energy changes for the reactions: 2H2(g) + O2(g) ? 2H2O(g) and CO(g) + H2O(g) ? CO2(g) + H2(g) are - 457.0 kJ and - 28.5 kJ respectively. Standard free energy for the reaction: 2CO2 ? 2 CO(g) + O2(g) will be: 1) – 514.0 kJ 2) – 485.4 kJ 3) 484.4 kJ 4) 514.0 kJ
SOLUTION
On multiplying second eq. by 2 and adding to the first eqn.:
2CO(g) + O2(g) ? 2CO2(g) ΔG = - 457.0 + 2 × (- 28.5) = - 514.0 kJ Hence, for 2CO2(g) ? 2CO(g) + O2(g), ΔG = 514.0 kJ
The correct answer is: 514.0 kJ
3
Dark reaction does not require light but needs 1) Water 2) ATP + NADPH2 3) Oxygen 4) Chlorophyll pigment
4 General Principles & Process of Isolation of Metals
What produce when a mixture of Cu2O and Cu2S is heated? 1) O2 2) SO2 3) H2S 4) None of these
It undergoes auto reduction forming copper and sulphur dioxide. $$2{ Cu }_{ 2 }O+{ Cu }_{ 2 }S\xrightarrow { heat } 6Cu+S{ O }_{ 2 }$$
5
Flurorescence is the process by which 1) Light energy is absorbed 2) Light energy is converted into chemical energy 3) Photosynthetic pigments are activated. 4) Excess energy is lost by light waves
6
The twisted ladder shape of DNA is called a: 1) hydrogen twist 2) deoxyribose flip 3) double helix 4) double membrane
7
cell inreases in volume when placed in solution which is1. Isotonic2. Hypotonic3. Hypertonic4. None of the above
8
From the petals a red dye is obtained which is used for dyeing silk. 1) Carthamus tinctorius 2) Tagetus erecta 3) Helianthus annus 4) Zinnia elegans
9 Biomolecules
Amino sugars are the building blocks of which polysaccharide? 1) Chitin 2) Starch 3) Glycogen 4) Cellulose
Chitin is a homopolymer of an amino derivative of glucose units, called N-acetyl glucose amine. Amino sugars are the building blocks of chitin.
10 Animal Kingdom
Identify the correct set of mammals that live wholly in water.
1) Whales,seals,dolphins
2) Seals,whales,shark
3) Hippocampus, whale, scoliodon
4) Rohu,shark,catla
In aquatic mammals, whales, seals and dolphins live completely in water.
Sharks, rohu, catla are not mammals.
So, the correct option is 'Whales, seals and dolphins'.
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