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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

2020

Q11
Baking soda is a mixture of:

Solution

Q12
The chemical formula of Plaster of Paris is:

Solution

Q13
The laws of reflection hold true for:

Solution

Q14
When an object is kept within the focus of a concave mirror, an enlarged image is formed behind the mirror. This image is:

Solution

Q15
At the time of short circuit, the electric current in the circuit:

Solution

Q16
Which one of the following is responsible for the sustenance of underground water?

Solution

Q17
Incomplete combustion of coal and petroleum:
(A) increases air pollution.
(B) increases efficiency of machines.
(C) reduces global warming.
(D) produce poisonous gases.
The correct option is:

Solution

Q18
Assertion (A): Esterification is a process in which a sweet smelling substance is produced.
Reason (R): When esters react with sodium hydroxide an alcohol and sodium salt of carboxylic acid are obtained.

Solution

Solution

Q20
1g of copper powder was taken in a China dish and heated. What change takes place on heating? When hydrogen gas is passed over this heated substance, a visible change is seen in it. Give the chemical equations of reactions, the name, and the colour of the products formed in each case.

Solution

Subjects

2020

Q11 Baking soda is a mixture of:

Solution

Q12 The chemical formula of Plaster of Paris is:

Solution

Q13 The laws of reflection hold true for:

Solution

Q14 When an object is kept within the focus of a concave mirror, an enlarged image is formed behind the mirror. This image is:

Solution

Q15 At the time of short circuit, the electric current in the circuit:

Solution

Q16 Which one of the following is responsible for the sustenance of underground water?

Solution

Q17 Incomplete combustion of coal and petroleum: (A) increases air pollution. (B) increases efficiency of machines. (C) reduces global warming. (D) produce poisonous gases. The correct option is:

Solution

Q18 Assertion (A): Esterification is a process in which a sweet smelling substance is produced. Reason (R): When esters react with sodium hydroxide an alcohol and sodium salt of carboxylic acid are obtained.

Solution

Solution

Q20 1g of copper powder was taken in a China dish and heated. What change takes place on heating? When hydrogen gas is passed over this heated substance, a visible change is seen in it. Give the chemical equations of reactions, the name, and the colour of the products formed in each case.

Solution

Subjects

Q11
Baking soda is a mixture of:

Q12
The chemical formula of Plaster of Paris is:

Q13
The laws of reflection hold true for:

Q14
When an object is kept within the focus of a concave mirror, an enlarged image is formed behind the mirror. This image is:

Q15
At the time of short circuit, the electric current in the circuit:

Q16
Which one of the following is responsible for the sustenance of underground water?

Q17
Incomplete combustion of coal and petroleum:
(A) increases air pollution.
(B) increases efficiency of machines.
(C) reduces global warming.
(D) produce poisonous gases.
The correct option is:

Q18
Assertion (A): Esterification is a process in which a sweet smelling substance is produced.
Reason (R): When esters react with sodium hydroxide an alcohol and sodium salt of carboxylic acid are obtained.

Q20
1g of copper powder was taken in a China dish and heated. What change takes place on heating? When hydrogen gas is passed over this heated substance, a visible change is seen in it. Give the chemical equations of reactions, the name, and the colour of the products formed in each case.