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Chemical Reactivity (Group 1)

A chemist ope...

Question

A chemist opened a cupboard to find four bottles containing water solutions, each of which has lost its label. Bottles 1, 2 and 3 contained colourless solutions, while Bottle 4 contained a blue solution. The labels from the bottles were lying scattered on the floor of the cupboard.They were : copper (II) sulphate, sodium carbonate, lead-nitrate and hydrochloric acid.
By mixing samples of the contents of the bottles in pairs, the chemist made the following observations :
(i) Bottle 1 + Bottle 2 : white precipitate
(ii) Bottle 1 +. Bottle 3 : white precipitate
(iii) Bottle 1 + Bottle 4 : white precipitate
(iv) Bottle 2 + Bottle 3 : colorless gas evolved
(v) Bottle 2 + Bottle 4 : no visible reaction
(vi) Bottle 3 + Bottle 4 : blue precipitate
Chemical formula of white precipitate in observation (i) is __________.

A

C u C l_{2}

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B

P b C l_{2}

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C

P b C O_{3}

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D

C u S O_{3}

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Solution

The correct option is B $P b C l_{2}$
Bottle 1: lead-nitrate
Bottle 2: hydrochloric acid so
$P b (N O_{3})_{2} + H C l \to P b C l_{2}$
(white ppt.)

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Q. A chemist opened a cupboard to find four bottles containing water solutions, each of which has lost its label. Bottles 1, 2 and 3 contained colourless solutions, while Bottle 4 contained a blue solution. The labels from the bottles were lying scattered on the floor of the cupboard.They were : copper (II) sulphate, sodium carbonate, lead nitrate and hydrochloric acid.
By mixing samples of the contents of the bottles, in pairs, the chemist made the following observations:
(i) Bottle 1 + Bottle 2 : white precipitate
(ii) Bottle 1 + Bottle 3 : white precipitate
(iii) Bottle 1 + Bottle 4 : white precipitate
(iv) Bottle 2 + Bottle 3 : colorless gas evolved
(v) Bottle 2 + Bottle 4 : no visible reaction
(vi) Bottle 3 + Bottle 4 : blue precipitate

Colourless solution present in Bottle-1 is___________.

A cupboard of chemical opened and found four bottles containing water solutions, each of which had lost its label. Bottles 1, 2 and 3 contained colourless solutions, while bottle 4 contained a blue solution. The labels from the bottles were lying scattered on the floor of the cupboard.

They were: copper (II) sulphate, hydrochloric acid, lead nitrate and sodium carbonate.

By mixing samples of the contents of the bottles, in pairs, the chemist made the following observations :

Bottle 1 + Bottle 2

\to

white precipitate is formed.
Bottle 1 + Bottle 3

\to

white precipitate is formed.
Bottle 1 + Bottle 4

\to

white precipitate is formed.
Bottle 2 + Bottle 3

\to

colourless and odourless gas is evolved.

Bottle 2 + Bottle 4

\to

no visible reaction is observed.
Bottle 3 + Bottle 4

\to

blue precipitate is formed.

With the help of the above observations, the bottle 3 contains__________ .

Q. Bottle (A) contain 320mL of

H_{2} O_{2}

solution and labelled with

10 V H_{2} O_{2}

and bottle (B) contain

80

H_{2} O_{2}

having normality

5 N

. Content of bottle (A) and bottle (B) are mixed and solution is filled in bottle (C). Select the correct label for bottle (C) in term of volume strength and g/litre.

Q. Directions:- Study the following information carefully to answer the question given below.

Six chemicals L, M, N, O, P and Q are kept in bottles of different colours viz. green, red, blue, white, pink and violet, not necessarily in the same order. The bottles are arranged from left to right, again not necessarily in the same order.
Chemical M is kept in a white bottle. Chemical L is not kept in a green bottle and is kept to the immediate left of the violet bottle. Chemical O is kept in the blue bottle and is kept exactly between the bottles containing chemicals L and M. The red bottle is at the extreme left end. The bottles containing chemical Q is not kept at either of the ends. The green bottle is kept at the extreme right end. Chemical P is not kept near the white bottle.

Which bottle contains chemical N?

Q. Directions:- Study the following information carefully to answer the question given below.

Six chemicals L, M, N, O, P and Q are kept in bottles of different colours viz. green, red, blue, white, pink and violet, not necessarily in the same order. The bottles are arranged from left to right, again not necessarily in the same order.
Chemical M is kept in a white bottle. Chemical L is not kept in a green bottle and is kept to the immediate left of the violet bottle. Chemical O is kept in the blue bottle and is kept exactly between the bottles containing chemicals L and M. The red bottle is at the extreme left end. The bottles containing chemical Q is not kept at either of the ends. The green bottle is kept at the extreme right end. Chemical P is not kept near the white bottle.

Which of the following combinations of chemical and bottle is correct?

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