CBSE Class 10 Science Sample Paper 2015 Set F

Que. 1 Acetic acid was added to four test tubes containing the following chemicals:

a. Sodium carbonate

b. Blue litmus solution

c. Lime water

d. Distilled water

Which amongst these is/ are correct option(s) for carrying out a characteristic test for identification of a carboxylic acid (acetic acid) in the laboratory?

1. (a) only

2. (c) only

3. (a) and (b)

4. (c) and (d)

Que. 2 On adding concentrated NaOH solution to a test tube containing phenolphthalein, the colour change observed by a student would be:

a. Pink to colourless

b. Pink to blue

c. Colourless to pink

d. Red to blue

Que. 3 A student observed a focussed slide of a stage of binary fission in Amoeba under a microscope as seen below:

Which of the following is most appropriate statement with respect to the observationa) preliminary stage

b) intermediate stage where the nucleus is divided and cytoplasm is not

c) intermediate stage where the cytoplasm is divided and nucleus is not

d) final stage

Que. 4 A student while observing the properties of acetic acid would report that this acid smells like

(i) vinegar and turns red litmus blue

(ii) rotten egg and turns red litmus blue

(iii) vinegar and turns blue litmus red

(iv) rotten egg and turns blue litmus red

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