Question

(1) On heating lead nitrate which of the following pairs of gases will be evolved.
(a)NO+02
(b) NO2 + O2
(C) NO3 + O2
(d) N20 + O2

(2) The PH value of aqueous solution A, B, C, and D are 1.9, 2.5, 2.1, and 3.0 are respectively
then what will be correct order of their strength?
(A) A<C<B<D
(b) D<C<B<A
(c) D< B<C<A
(d) D>C> B> A

(3) Forest based industries are
(a) meat and leather
(b) Coal and iron
(c) Petroleum and Wood
(d) timber lac and paper

(4) Which organ store bile?
(a)liver
(b) Pancreas
(c) Small intestine
(d) Gall bladder


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Answer 1

Answer:

1. b) NO2 + O2

2. a) A<C<B<D

3. d) timber lac and paper

4. d) Gall bladder

Answer 2

1) B

2) A

3) D

4) D

Explanation:

1) When heated, lead nitrate decomposes into lead oxide, nitrogen dioxide, and oxygen. Decomposition of lead nitrate produces lead oxide, nitrogen dioxide, and oxygen. When lead nitrate is heated vigorously in a dry test tube, lead oxide (PbO), nitrogen dioxide (NO2), and oxygen are produced (O2). The ensuing product, lead oxide (PbO), and the formation of a reddish-brown gas, nitrogen dioxide, cause the lead nitrate to turn yellow.

2) 1-6 = acids, 7 - neutral, 8-14 = bases

3) Timber lac and paper are products of forest based industries.

4) The gallbladder is a pear-shaped reservoir that absorbs and stores bile produced by the liver. It is placed directly under the liver. To aid in food digestion, the gallbladder sends this stored bile into the small intestine.