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Question
SHORT ANSWER TYPE QUESTIONS (3 MARKS each)
1. A white coloured powder is used by doctors for supporting fractured bones.
(a) Write chemical name and formula of the powder.
(b) When this white powder is mixed with water a hard solid mass is obtained. Write balanced chemical equation for the change.
2. (i) Write the electron dot structures for sodium, oxygen and magnesium.
(ii) Show the formation of Na2O and MgO by the transfer of electrons.
(iii) What are ions present in these compounds?
3. a)Why regeneration cannot be considered as true mode of reproduction ?
b) What happens if ovum is not fertilized?
4. What is magnetic field? Name the sources of magnetic field.
5.Write the expressions for magnetic field due to straight current carrying conductor and name the rule to find the direction of magnetic field.
1. A white coloured powder is used by doctors for supporting fractured bones.
(a) Write chemical name and formula of the powder.
(b) When this white powder is mixed with water a hard solid mass is obtained. Write balanced chemical equation for the change.
2. (i) Write the electron dot structures for sodium, oxygen and magnesium.
(ii) Show the formation of Na2O and MgO by the transfer of electrons.
(iii) What are ions present in these compounds?
3. a)Why regeneration cannot be considered as true mode of reproduction ?
b) What happens if ovum is not fertilized?
4. What is magnetic field? Name the sources of magnetic field.
5.Write the expressions for magnetic field due to straight current carrying conductor and name the rule to find the direction of magnetic field.
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Solution
Dear student, solution to your query 1 has been given below: (1) (a) Calcium sulphate hemihydrage. Formula - CaSO4 ½ H2O. (b) CaSO4 ½ H2O + 3/2 H2O -----> CaSO4.2H2O regards,
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