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Class 6	Science Mathematics Social Science	English Hindi Computer
Class 7	Science Mathematics Social Science	English Hindi Computer
Class 8	Science Mathematics Social Science	English Hindi Computer
Class 9	Science Mathematics Social Science	English Hindi Computer
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Class 11	Physics Chemistry Biology	Mathematics English Economics
Class 12	Physics Chemistry Biology	Mathematics English Economics
Class 5	EVS
College Entrance	Jamia Millia Islamia Aligarh Muslim University Banaras Hindu University

2019

Q1
Name and define the SI unit of current.

Solution

Q2
Write the name of the main constituent of biogas. Also, state its percentage.

Solution

Q3
Write the name, symbol and electronic configuration of an element X whose atomic number is 11.

Solution

Q4
Can the following groups of elements be classified as Dobereiner’s triad:
(a) Na, Si, Cl
(b) Be, Mg, Ca
Atomic mass of Be-9; Na-23, Mg-24, Si-28, Cl-35, Ca-40, Justify your answer in each case.

Solution

Q5
How is O<sub>2</sub> and CO<sub>2</sub> transported in human beings?

Solution

Q6
Write the structure of eye lens and state the role of ciliary muscles in the human eye.

Solution

Q7
Identify the acid and base which form sodium hydrogen carbonate. Write a chemical equation in support of your answer. State whether this compound is acidic, basic or neutral. Also, write its pH value.

Solution

Q8
Based on the group valency of elements write the molecular formula of the following compounds giving justification for each:
(i) Oxide of first group elements.

Solution

Q9
Based on the group valency of elements write the molecular formula of the following compounds giving justification for each:
(ii) Halide of the elements of group thirteen, and

Solution

Q10
Based on the group valency of elements write the molecular formula of the following compounds giving justification for each:
(iii) Compound formed when an element, A of group 2 combines with an element, B of group seventeen.

Solution

Subjects

2019

Q1 Name and define the SI unit of current.

Solution

Q2 Write the name of the main constituent of biogas. Also, state its percentage.

Solution

Q3 Write the name, symbol and electronic configuration of an element X whose atomic number is 11.

Solution

Q4 Can the following groups of elements be classified as Dobereiner’s triad: (a) Na, Si, Cl (b) Be, Mg, Ca Atomic mass of Be-9; Na-23, Mg-24, Si-28, Cl-35, Ca-40, Justify your answer in each case.

Solution

Q5 How is O<sub>2</sub> and CO<sub>2</sub> transported in human beings?

Solution

Q6 Write the structure of eye lens and state the role of ciliary muscles in the human eye.

Solution

Q7 Identify the acid and base which form sodium hydrogen carbonate. Write a chemical equation in support of your answer. State whether this compound is acidic, basic or neutral. Also, write its pH value.

Solution

Q8 Based on the group valency of elements write the molecular formula of the following compounds giving justification for each: (i) Oxide of first group elements.

Solution

Q9 Based on the group valency of elements write the molecular formula of the following compounds giving justification for each: (ii) Halide of the elements of group thirteen, and

Solution

Q10 Based on the group valency of elements write the molecular formula of the following compounds giving justification for each: (iii) Compound formed when an element, A of group 2 combines with an element, B of group seventeen.

Solution

Subjects

Q1
Name and define the SI unit of current.

Q2
Write the name of the main constituent of biogas. Also, state its percentage.

Q3
Write the name, symbol and electronic configuration of an element X whose atomic number is 11.

Q4
Can the following groups of elements be classified as Dobereiner’s triad:
(a) Na, Si, Cl
(b) Be, Mg, Ca
Atomic mass of Be-9; Na-23, Mg-24, Si-28, Cl-35, Ca-40, Justify your answer in each case.

Q5
How is O<sub>2</sub> and CO<sub>2</sub> transported in human beings?

Q6
Write the structure of eye lens and state the role of ciliary muscles in the human eye.

Q7
Identify the acid and base which form sodium hydrogen carbonate. Write a chemical equation in support of your answer. State whether this compound is acidic, basic or neutral. Also, write its pH value.

Q8
Based on the group valency of elements write the molecular formula of the following compounds giving justification for each:
(i) Oxide of first group elements.

Q9
Based on the group valency of elements write the molecular formula of the following compounds giving justification for each:
(ii) Halide of the elements of group thirteen, and

Q10
Based on the group valency of elements write the molecular formula of the following compounds giving justification for each:
(iii) Compound formed when an element, A of group 2 combines with an element, B of group seventeen.