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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
Class 10	Science Math Social Science	English Hindi Computer
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

Q31
What is methane? Draw its electron dot structure. Name the type of bonds formed in this compound. Why are such compounds:
(i) poor conductors of electricity? and
(ii) have low melting and boiling points?
What happens when this compound bums in oxygen?

Solution

Q32
Write the main difference between an acid and a base. With the help of suitable examples explain the term neutralization and the formation of -
(i) acidic,
(ii) basic and
(iii) neutral salts.

Solution

Q33
In the experimental set up to show that “CO₂ is given out during respiration”, name the substance taken in the small test tube kept in the conical flask. State its function and the consequence of its use.

Solution

Q34
A student is observing the temporary mount of a leaf peel under a microscope. Draw a labeled diagram in proper sequence to show budding in hydra.
OR
Draw a labelled diagram in the proper sequence to show budding in hydra.

Solution

Q35
List four precautions which a student should observe while determining the focal length of a given convex lens by obtaining image of a distant object on a screen.

Solution

Solution

Q37
What would you suggest to student if while performing an experiment he finds that the pointer/needle of the ammeter and voltmeter do not coincide with the zero marks on the scales when circuit is open? No extra ammeter/voltmeter is available in the laboratory.

Solution

Solution

Q39
Blue litmus solution is added to two test tubes. A and B containing dilute HCl and NaOH solution respectively. In which test tube a colour change will be observed? State the colour change and give its reason.

Solution

Q40
What is observed when 2mL of dilute hydrochloric acid is added to 1 g of sodium carbonate taken in a clean and dry test tube? Write chemical equation for the reaction involved.

Solution

Subjects

2019

Q31 What is methane? Draw its electron dot structure. Name the type of bonds formed in this compound. Why are such compounds: (i) poor conductors of electricity? and (ii) have low melting and boiling points? What happens when this compound bums in oxygen?

Solution

Q32 Write the main difference between an acid and a base. With the help of suitable examples explain the term neutralization and the formation of - (i) acidic, (ii) basic and (iii) neutral salts.

Solution

Q33 In the experimental set up to show that “CO₂ is given out during respiration”, name the substance taken in the small test tube kept in the conical flask. State its function and the consequence of its use.

Solution

Q34 A student is observing the temporary mount of a leaf peel under a microscope. Draw a labeled diagram in proper sequence to show budding in hydra. OR Draw a labelled diagram in the proper sequence to show budding in hydra.

Solution

Q35 List four precautions which a student should observe while determining the focal length of a given convex lens by obtaining image of a distant object on a screen.

Solution

Solution

Q37 What would you suggest to student if while performing an experiment he finds that the pointer/needle of the ammeter and voltmeter do not coincide with the zero marks on the scales when circuit is open? No extra ammeter/voltmeter is available in the laboratory.

Solution

Solution

Q39 Blue litmus solution is added to two test tubes. A and B containing dilute HCl and NaOH solution respectively. In which test tube a colour change will be observed? State the colour change and give its reason.

Solution

Q40 What is observed when 2mL of dilute hydrochloric acid is added to 1 g of sodium carbonate taken in a clean and dry test tube? Write chemical equation for the reaction involved.

Solution

Subjects

Q31
What is methane? Draw its electron dot structure. Name the type of bonds formed in this compound. Why are such compounds:
(i) poor conductors of electricity? and
(ii) have low melting and boiling points?
What happens when this compound bums in oxygen?

Q32
Write the main difference between an acid and a base. With the help of suitable examples explain the term neutralization and the formation of -
(i) acidic,
(ii) basic and
(iii) neutral salts.

Q33
In the experimental set up to show that “CO₂ is given out during respiration”, name the substance taken in the small test tube kept in the conical flask. State its function and the consequence of its use.

Q34
A student is observing the temporary mount of a leaf peel under a microscope. Draw a labeled diagram in proper sequence to show budding in hydra.
OR
Draw a labelled diagram in the proper sequence to show budding in hydra.

Q35
List four precautions which a student should observe while determining the focal length of a given convex lens by obtaining image of a distant object on a screen.

Q37
What would you suggest to student if while performing an experiment he finds that the pointer/needle of the ammeter and voltmeter do not coincide with the zero marks on the scales when circuit is open? No extra ammeter/voltmeter is available in the laboratory.

Q39
Blue litmus solution is added to two test tubes. A and B containing dilute HCl and NaOH solution respectively. In which test tube a colour change will be observed? State the colour change and give its reason.

Q40
What is observed when 2mL of dilute hydrochloric acid is added to 1 g of sodium carbonate taken in a clean and dry test tube? Write chemical equation for the reaction involved.