NDA 2016 Paper 1 | Chemistry Question 37 | General Science

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NDA 2016 Paper 1

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A glass vessel is filled with water up to the brin and a lid is fixed to it tightly. Then it is kept inside a freezer for hours. What is expected to happen?

The water freezes to ice and the level of ice comes down

The water in the glass vessel summer freezes to ice

The glass vessel breaks due to expansion as water freezes to ice

The water does not freeze at all

NDA 2016 Paper 1

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+2.5

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Suppose you have four test tubes labelled A, B, C and D. A contains water, B contains solution of an alkali, C contains solution of an acid, and D contains solution of sodium chloride. Which one of these solutions will turn phenolphthalein solution pink?

Solution A

Solution B

Solution C

Solution D

NDA 2016 Paper 1

MCQ (Single Correct Answer)

+2.5

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An tom of carbon has 6 protons. Its mass number is 12. How many neutrons are present in an atom of carbon?

NDA 2016 Paper 1

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+2.5

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Which one of the following following is a reduction reaction?

$$2Mg(s) + {O_2}(g)\buildrel {} \over \longrightarrow 2MgO(s)$$

$$S(s) + {O_2}(g)\buildrel {} \over \longrightarrow S{O_2}(g)$$

$$2HgO(s)\buildrel {Heat} \over \longrightarrow 2Hg(l) + {O_2}(g)$$

$$Mg(s) + S(s)\buildrel {} \over \longrightarrow MgS(s)$$

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