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Mrinal Mathur

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Mrinal Mathur
24 Apr 2025 08:13 PM study24x7 study24x7

In which of the following processes does the identity of the initial substance remain unchanged? (CBSE BOARD 2020)

A

Curdling of milk

B

Formation of crystal by crystallization

C

Fermentation of grapes

D

Digestion of food

Class 10
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Mrinal Mathur
24 Apr 2025 08:06 PM study24x7 study24x7

Which of the following is NOT a characteristic of chemical reaction?

A

Change in temperature

B

Change in colour

C

Change in state

D

Change in size

Class 10
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Mrinal Mathur
24 Apr 2025 08:02 PM study24x7 study24x7

Follow me for more notes of class 9 and 10

Class 10
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Mrinal Mathur
23 Apr 2025 07:53 PM study24x7 study24x7

Which of the following is a acid?

A

H2SO4

B

NaOH

C

Nacl

D

HBr

Class 10
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Mrinal Mathur
23 Apr 2025 07:51 PM study24x7 study24x7

Which type of gas produce pop sound when it burns?

A

Oxygen

B

Helium

C

Hydrogen

D

Carbon dioxide

Class 10
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Mrinal Mathur
23 Apr 2025 07:34 PM study24x7 study24x7

Follow me for more and more learning notes of class 9th and 10th

Class 10
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Mrinal Mathur
23 Apr 2025 04:02 PM study24x7 study24x7

If you are in class 9 or 10 Then this platform will help you very very much.

Class 9 Class 10
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  • Dev kumar
    • Yes
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    Reply 23 Apr 2025 04:09 PM
    Mrinal Mathur
    23 Apr 2025 04:00 PM study24x7 study24x7

    A full notes about the topic MOTION science

    MOTION_9ba578d7-4615-43df-a7ca-937280cb6601.docx
    12 Downloads
    Class 9 Class 10 Class 12 (PCB)
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  • Dev kumar
    • Thanks
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    Reply 1 23 Apr 2025 04:11 PM
    Mrinal Mathur
    23 Apr 2025 03:56 PM study24x7 study24x7

    Who make modern periodic table

    A

    Antone lavoisier

    B

    Henry moseley

    C

    Diberenier triades

    D

    Newland octates

    Class 10 Class 12 (PCB) Class 12 (PCM)
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  • Dev kumar
    • The modern periodic table was developed by Henry Moseley in 1913. He refined the periodic table by organizing elements based on their atomic number rather than atomic mass, which resolved inconsistencies in Mendeleev's earlier table. While Mendeleev is credited with creating the first widely recognized periodic table, Moseley's work was crucial in establishing the modern version.

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    Reply 1 23 Apr 2025 04:05 PM
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