write the multiplicative inverse of a.23/19 b.-26/82 c. -19/34
Answers
Answer:
hydrated salt. When this salt
kept in open air, it loses water molecules in a process called efflorescence
When dissolved in water it forms a strong base and a weak acid, 2
1. What is the compound, X?
(a)NaHCO,
2. The compound Y is
(b) Na₂CO
(a) NaHCO₂)
3. What is the nature of the solution formed by dissolving Y in water?
(b) Na CO₂
(b) Acidic
(c) Na CO₂ 10H₂0
(c) Neutral
(a) Alkaline
4.
Identify the compound, Z
(a) CO₂
Assertion and Reason:
In the following questions, a statement of assertion (A) is followed by a statement of reason
correct choice as:
(b) H₂CO
(d) NaCl
(d) NaCl
(d) It remains insoluble
(d) H₂0
IV.
(R). Mark
(a) Both assertion (A) and reason (R) are true and reason (R) is the correct explanation of assertion (
(b) Both assertion (A) and reason (R) are true but reason (R) is not the correct explanation of
assertion(A).
(c) Assertion (A) is true but reason (R) is false.
(d) Assertion (A) is false but reason (R) is true.
1. Assertion: The height of an object is always considered positive.
Reason: An object is always placed above the principal axis in this upward direction
2. Assertion: Veins have thin walls to collect blood from different organs
Reason: Blood in veins are not under pressure.
3. Assertion: During electrolysis of concentrated aqueous solution of sodium chloride, hydrogen is
produced at anode and chlorine gas is produced at cathode.
Reason: lons get attracted to oppositely charged electrodes
4. Assertion: All proteins in our food are digested in small intestine only.
Reason: The protein digesting enzymes are released into small intestine.
5. Assertion: Plaster of Paris is used by doctors for setting fractured bones
Reason: When Plaster of Paris is mixed with water and applied around the fractured limbs, it set
hard mass.
6. Assertion: The mirror used in search lights are concave mirrors.
Reason: In concave spherical mirrors the image formed is always virtual.
Answer: