Give reasons (i) Con.`HNO_3` can be transported in Al containers

Assertion: Wind pollination requires that the pollen grains are light and non-sticky. Reason: Light pollen grains can be transported easily in wind currents.

Give reasons. (i )Solutions of alkali metals in liquid ammonia are blue in colour.

An amine on treatment with HNO_2 evolved N_2 . The amine on exhaustive methylation with CH_3 I formed a quaternary salt containing 59.07% iodine. The amine is likely to be:

Which of the following sentences are statements. Give reasons for your answer. i) There are 35 days in a month.

Give reasons (v) Al alloys are used to make aircraft body

Give reasons (ii) A mixture of Al pieces and dilute NaOH is used to open drains

Explain giving two reasons why pollen grains can be preserved as fossils.

(a)Which of the following sentences are statements?Give reasons for your answer(i)There are 35 days in a month.

Assertion : On the addition of conc. HNO_(3) to the aqueous solution of common salt, NaCl crystallises out Reason : After the reaction between conc. HNO_(3) and hydrated ions, the water molecules are removed and the ions are thus unsolvated. (I) Both assertion and reason are true and reason is the correct explanation of assertion (II) Both assertion and reason are true and reason is not the correct explanation of assertion (III) Assertion is true and reason is false (IV) Assertion is true and reason is false