Injso

The organism whose body develops from two germ layers are called diploblastic, whereas the organism developed from three germ layers are called triploblastic. In some triploblastic organism the body cavity or coelom is formed from mesoderm and endoderm. Such an organism is called as [P ] and an example for it is [Q ] Choose the correct option to fill in the blanks in the above statement. 

(a) [P] – Coelomate; [Q]-Hydra 

(b) [P] – Coelomate ; [Q]-Planaria 

(c) [P] – Pseudocoelomate; [Q]- Pila 

(d) [P] – Pseudocoelomate ; [Q]- Ascaris

When two equimolar salt solutions are separated by a selectively permeable membrane, the movement of water molecule across the membrane depends on the water potential of the respective solutions. Water moves from higher water potential to lower water potential.Higher the concentration of ions in a solution; lower is its water potential. In an experiment, two compartments are separated by a specifically designed synthetic membrane that is permeable to water and urea and not to sodium chloride molecules.

Hint: MW of NaCl: 58.4 g/mol MW of Urea: 60 g/mol. In the above condition, which one of the following options best represents the movement of water and its reason? 

(a) Water moves into P, because P has higher concentration of non-penetrating solutes. 

(b) Water moves into P, because P has higher concentration of penetrating solutes. 

(c) Water moves into Q, because Q has higher concentration of non-penetrating solutes. 

(d) Water moves into Q, because Q has lower concentration of non-penetrating solutes.

Metals react with oxygen to form metal oxides. If the metals considered are K, Cs, Mg and
Sr, the correct order of the basic character of their oxides is 

A.  MgO>SrO>K₂O>Cs₂O

B.Cs₂O < K₂O < MgO < SrO

C. MgO<SrO<K₂O<Cs₂O

D. K₂O<MgO<SrO<Cs₂O

In the figure given, PQ is a long uniform coil of metal wire, V is a constant voltage source and ASB is a rheostat. Consider the following statements and choose the correct option.

I) The (equivalent) pole at the end P if slider S of rheostat is moved from A to B is North.

II) The (equivalent) pole at the end P if slider S of rheostat is moved from A to B is South.

III) The (equivalent) pole at the end P if slider S of rheostat is moved from B to A is North

IV) The (equivalent) pole at the end P if slider S of rheostat is moved from B to A is South.

(a) Only III and IV are correct 

(b) Only I and II are correct

(c) Only II and IV are correct 

(d) Only II and Iv are correct

(I) Alumina is nature occurs as a colourless mineral corundum. Being amphoteric it reacts with acids as well as alkalis. It is used to prepare anhydrous aluminium chloride by passing chlorine gas over heated mixture of alumina and carbon. Write the balanced chemical equation for the same.

(II) Double salts of the type M₂SO₄, M’₂ (SO₄)₃, 24H₂O are called alums.Here M is univalent ion such as Na+, K+ etc. Whereas M’ is a trivalent ion like Al³⁺ , Fe³⁺ etc. Potash alum [K₂SO₄, Al₂(SO₄)₃ . 24H₂O] the common alum is manufactured from alum shale which contains iron disulphide and aluminium silicate (Al₂O₃. xSiO₂) and that is roasted in excess air to yield aluminium sulphate and ferrous sulphate. Ferrous sulphate is removed by fractional crystallisation and calculated quantity of K₂SO₄ is added to the mother liquor which is concentrated to give crystals of alum. Write balanced chemical equation for roasting of alum shale.