Advertisements
Advertisements
Question
Which of the following statement is incorrect for a chemical reaction?
Options
Heat may be given out but never absorbed.
The sound may be produced.
A colour change may take place.
A gas may be evolved.
Solution
Heat may be given out but never absorbed.
Explanation:
Heat may be given out or absorbed during a chemical reaction.
APPEARS IN
RELATED QUESTIONS
MULTIPLE CHOICE QUESTIONS
Tick the most appropriate answer
Which of the following is a reducing agent?
- oxygen
- chlorine
- hydrogen
- none of these
What do you observe when :
an iron nail is kept in tap water for few days
Fill in the blank:
The substances which undergo chemical change are called _______
Write true or false :
When iron and sulphur are heated together a grey mass is formed which is attracted by a magnet .
State the type of reactions for the following represent and balance the ones that are not balanced.
Cl2 + 2KBr → 2KCl + Br2
Give two examples where a chemical reaction is accompanied by a change in colour of the reactants and products on completion of the reaction.
Silver metal can displace hydrogen gas from nitric acid.
Chemists identify gypsum as a natural indicator.
Two chemical species X and Y combine together to form a product P which contains both X and Y
\[\ce{X + Y -> P}\]
X and Y cannot be broken down into simpler substances by simple chemical reactions. Which of the following concerning the species X, Y and P are correct?
(i) P is a compound
(ii) X and Y are compounds
(iii) X and Y are elements
(iv) P has a fixed composition
Why is spoiling food a chemical change?
