Chemistry

On exposure to the atmosphere, a hydrated salt loses its water of crystallization to become anhydrous. This phenomenon is referred to as?

A. efflorescence B. deliquescence C. hygroscopy D. hydrolysis Correct Answer: Option A - efflorescence

5 years ago

Water is said to be temporarily hard when it contains?

A. Ca (HCO3)2 and Mg (HCO3)2 salts B. Ca (HCO3)2 and CaCO3 salts C. Mg(HCO3)2 and CaSO4 salts D. CaSO4…

5 years ago

The nitrogen obtained from air has a density higher than the one from nitrogen-containing compounds because the one from air is contaminated with?

A. water vapour B. oxgyen C. rare gases D. carbon (IV) oxide Correct Answer: Option C - rare gases

5 years ago

The radio active radiation used in studying the arrangement of particles in giant organic molecules is?

A. γ - rays B. α - particles C. X-rays D. β - particles Correct Answer: Option C - X-rays

5 years ago

How many protons, neutrons and electrons respectively are present in the element 60/27 Co?

A. 27, 33 and 33 B. 33, 27 and 27 C. 27, 33, and 27 D. 60, 33 and 60…

5 years ago

If the difference in electronegativity of elements P and Q is 3.0. The bond that will be formed between them is?

A. metallic B. covalent C. co-ordinate D. ionic Correct Answer: Option D - ionic

5 years ago

Beryllium and aluminium have similar properties because they _______?

A. are both metals B. belongs to the same group C. belong to the same period D. are positioned diagonally…

5 years ago

200 cm³ of a gas at 25°C exerts a pressure of 700 mmHg. Calculate its pressure if its volume increases 350 cm³ at 75°C.

A. 342.53 mmHg B. 1430.54 mmHg C. 467.11 mmHg D. 400.00 mmHg Correct Answer: Option C - 467.11 mmHg

5 years ago

An element X has electron configuration 1s² 2s² 2p6 3s² 3p5. Which of the following statements is correct about the element?

A. lt has a completely filled p-orbital B. lt has 5 electrons in its outermost shell. C. lt belongs to…

5 years ago

A gas X diffuses twice as fast as gas Y. if the relative molecular mass of X is 32, calculate the relative molecular mass of Y.

A. 128 B. 8 C. 16 D. 64 Correct Answer: Option A - 128

5 years ago
Show more Posts
Show previous Posts