Test Details

Chemical Reactions and Equations

Chapter practice

Mar 03, 7:30 PM

60 minutes

Mar 03, 8:30 PM

80.0 marks

MCQ

40 questions

Suraj Sagar

I'm a professional teacher. Guiding and coaching students from 12 years. I'm a meditator also. I prepare students not only with subjects also guiding them to achieve their goals. I trust in hard work. Part of Ed-tech Platform serving WORK FROM ANYWHERE Spend daily 2hrs Learn get trained And Earn 2k to 5k daily

Class Details

Science

English Language

Spoken English

Maths

Literature

Meditation

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Science

English Language

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Maths

Literature

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Question Text

Question 1 :
Whenever a chemical change occurs, we can say that a chemical reaction has taken place.

Question 2 :
What does decomposition reaction for silver bromide require energy in the form of?

Question 3 :
Why are decomposition reactions called the opposite of combination reactions? Explain.

Question 4 :
What is the substance getting reduced in $CuO(s) + H_2(g) → Cu(s) + H_2O(l) $?

Question 5 :
Explain oxidation and in terms of gain or loss of oxygen.

Question 6 :
How do we come to know that a chemical reaction has taken place? Explain.

Question 7 :
A shiny brown coloured element ‘X’ on heating in air forms a black coloured compound. What is the black coloured compound formed?

Question 8 :
When you add lead nitrate to potassium iodide, their particles combine to form?

Question 9 :
What is the substance getting oxidised in $CuO(s) + H_2(g) → Cu(s) + H_2O(l) $?

Question 10 :
When a magnesium ribbon is burnt in oxygen, it gets converted to

Question 11 :
Magnesium ribbon is rubbed before burning because it has a coating of

Question 12 :
What does decomposition reaction for water require energy in the form of?

Question 15 :
Write the balanced chemical equations for Calcium hydroxide + Carbon dioxide → Calcium carbonate + Water.

Question 16 :
What is the balanced chemical equations when barium chloride reacts with aluminium sulphate to give aluminium chloride and a precipitate of barium sulphate?

Question 17 :
A solution of a substance X' is used for white washing. Name the substance 'X'.

Question 19 :
$Fe_2O_3$ + 2Al → $Al_2O_3$ + 2Fe. The above reaction is an example of a

Question 20 :
What happens when dilute hydrochloric acid is added to iron filings ?

Question 21 :
What type of a reaction is $H_2 (g) + Cl_2 (g) → 2HCl(g) ? $

Question 22 :
What is the balanced chemical equations when potassium metal reacts with water to give potassium hydroxide and hydrogen gas?

Question 23 :
Before burning in air, the magnesium ribbon is cleaned by rubbing with a sand paper to:

Question 24 :
What does decomposition reaction for calcium carbonate require energy in the form of?

Question 26 :
What is the balanced chemical equations when hydrogen gas combines with nitrogen to form ammonia?

Question 28 :
Why are oil and fat containing food items are flushed with nitrogen?

Question 31 :
A shiny brown coloured element ‘X’ on heating in air forms a black coloured compound. What is it?

Question 33 :
Balance the chemical equation:- $BaCl_2 + H_2SO_4 → BaSO_4 + HCl$.

Question 34 :
What is the balanced chemical equation for Magnesium (s) + Hydrochloric acid (aq) → Magnesium chloride (aq) + Hydrogen (g) ?

Question 35 :
What does decomposition reaction for water require energy in the form of?

Question 36 :
When a magnesium ribbon is burnt in air, the ash formed is

Question 37 :
What is the substance getting reduced in $4Na(s) + O_2(g) → 2Na_2O(s)$?

Question 38 :
Why are decomposition reactions called the opposite of combination reactions? Explain.

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